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Filter Bag


Fiberglass filter bag


Mainly Specification:
1. Main products: two categories of medium alkaline and alkaline free glass fiber filter cloth(bag).
2. various types:heat treatment,silicone oil, graphite.
3. various thickness:0.3-0.5mm
4. various diameters

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Glass fiber filter cloth is made of the fiberglass yarn,with special treatment like graphite,silicon,ptfe dipping, against acid treatment and other chemical treatment. it is an ideal high temperature resist filter cloth the fiberglass filter bags are widely used in industrial dust clean area,bag house, air pollution and valuable dust recycling, etc.

1. good heat resistance, suitable for long-time use under a temperature below 280 deg.
2. good dust peeling performance, low power coindumption for ash removal.
3.The size of the fiberglass filter bags is more stable, no fiber shrinkage under the high temperature.
4. good chemical resistance:except hydroelectric acid strong acid,and strong alkaline, it is more stable than other filter medium.
5. The fiberglass filter fabric is not absorbing moisture and humidity
6. filtering efficient of the fiberglass filter bag can be over 99.5%etc and catch the dust below the PM2.5,we can get the 20mg air release.
7.High strength of the fiberglass filter cloth, can be more than 3000N/5*20cm

The cement industry
Cement kiln character
Cement raw material in the decomposition oven is not completely decomposed into caco3 dust
together with CaO dust during the decomposition of the caco3 produced
For burning pulverized coal produced in the combustion process sox nox co co2 and other gases
Kiln temperature exhaust gas from the cyclone out of more than 320 degrees drying gas
Dust concentration of dust particle size less than 10um accounted for more than 90%
Sometimes co content according to each of the combustion fluctuates

There are three items for choose:

Mainly Specification:
1. Main products: two categories of medium alkaline and alkaline free glass fiber filter cloth(bag).
2. various types:heat treatment,silicone oil, graphite.
3. various thickness:0.3-0.5mm
4. various diameters


Metal Smelting--Dedusting equipment in smelting industry

In metal smelting, polyester filter bag is mainly used for steel slag bag filter, steel sintering machine filter, steel blast furnace gas filter and steel plant filter.

1.Bag filter for steel slag

The steel slag bag type dust collector comprises an air inlet, an air duct, an inclined baffle plate of the air duct, a filter bag and an ash hopper, which is characterized in that the dust collector is also provided with a guide plate and an inverted V-shaped plate, the guide plate is arranged at the middle lower part of the air duct, the inverted V-shaped plate is arranged at the right lower part of the air duct, and the lower ends of the guide plate and the inverted V-shaped plate are connected with the ash hopper, The upper end of the deflector is connected with the bag room of the dust collector. A quartz emery layer is coated on one side of the inclined baffle plate of the air duct in direct contact with the flue gas. Compared with the prior art, the utility model has the advantages of scientific and simple structure and long service life.

A group of opposite side walls of the steel slag bag filter box body are respectively provided with an air inlet and an air outlet, the air outlet is connected with the air extraction port of the blower, and a filter bag is longitudinally arranged in the box body; The box body is connected in series in the same row, and the middle part of the connecting wall of the adjacent box body is provided with an air vent; The pore size of the filter bag in each box is different. The pore size from the air inlet side to the air outlet side decreases in turn. The particles in the steel slag dust can be quickly separated step by step, and the separation efficiency is high.

The dust removal effect of bag filter for steel slag is as follows

The dust removal effect of steel slag bag filter is related to many factors, but mainly depends on the filter material. The filter material of bag filter is cloth or felt made of synthetic fiber, fiber or glass fiber. If necessary, sew the cloth or felt into a cylinder or flat filter bag. According to the nature of flue gas, the filter material suitable for application conditions is selected.

Advantages of bag filter for steel slag

Generally, when the flue gas temperature is lower than 120 ℃, the filter material is required to have acid resistance and durability; In the treatment of high temperature flue gas (< 250℃ ) Graphitized glass fiber cloth is mainly used; In some special cases, carbon fiber filter material is selected. In the case of coal and iron stone, explosion-proof treatment is also needed, so the filter material of silk should be selected for the dust removal bag.


2.Dust collector of iron and steel sintering machine

The dust collector of iron and steel sintering machine is an ideal dust removal equipment to solve the problem of dust containing flue gas at the end of sintering machine. According to the characteristics of large exhaust volume, high gas temperature and high dust concentration at the end of sintering machine in sintering plant, when selecting the dust collector system for sintering machine, it is analyzed according to different conditions of sintering machine, so as to achieve better dust removal effect of bag filter.

Performance characteristics of dust collector of iron and steel sintering machine:
1. The upper part of the bag is used to change the bag.
2. Perfect control system to ensure the long-term operation of dust removal system.
3. Compact inlet and outlet duct and equalizing device, low airflow resistance.
4. The bag can be changed without stopping the machine, and the normal operation of the equipment will not be affected by the maintenance.
5. The application of pulse blowing with air stopping in separate chamber can prolong the cleaning cycle and reduce the consumption, which can double the service life of filter bag and pulse valve.
6. The box body is designed with air tightness, good sealing performance, and the inspection door is made of excellent sealing material. The production process uses kerosene to detect leakage, with low air leakage rate.
7. The application of pulse injection cleaning technology has strong cleaning capacity, high dust removal efficiency, low emission concentration, small air leakage coefficient, low energy consumption, small steel consumption, small floor area, stable and reliable operation and good economic benefits. It is suitable for flue gas treatment in electric power, building materials, metallurgy, chemical industry and other industries.

The dust remover of iron and steel sintering machine is widely used in the flue gas treatment of electric power, building materials, metallurgy, chemical industry and other industries, especially for the flue gas with big storm and high temperature. It combines the characteristics of chamber back blowing and pulse cleaning, overcomes the shortcomings of ordinary chamber back blowing intensity and general pulse cleaning dust re adsorption, and the lengthened dust removal filter bag gives full play to the strong cleaning effect of compressed air. It is a large dust removal equipment with high dust removal efficiency, small floor area, stable operation, reliable performance and convenient maintenance.


3.Steel blast furnace gas dust collector

The blast furnace gas dust collector of iron and steel adopts the technology of pulse injection dust cleaning by stopping air in different rooms, which overcomes the shortcomings of conventional pulse dust collector and reverse blowing dust collector in different rooms. It has strong dust cleaning ability, high dust removal efficiency, low emission concentration, small air leakage rate, less energy consumption, less steel consumption, less floor area, stable and reliable operation, and good economic benefits. It is suitable for purification of dust gas and material recovery in metallurgy, building materials, cement, machinery, chemical industry, electric power and light industry.

The raw gas (260 ℃) from the raw gas main pipe enters into the lower box of the bag filter through the branch pipe. After mechanical separation, the gas is filtered upward through the cloth bag, and the fine dust is attached to the outer surface of the filter bag. The clean gas is collected into the upper box through the filter bag, and then enters into the hot blast stove through the clean gas branch pipe and the main pipe. When the filtering time is up, with the increase of dust on the surface of the filter bag, the resistance of the dust collector will rise. When the resistance rises to the value, the electrical control system will send out the ash cleaning signal, the pneumatic butterfly valve and upper ball valve of the outlet branch pipe will automatically close, the pulse valve will open, the nitrogen from the cylinder will be injected from the bag mouth through the injection pipe, and the filter bag will expand rapidly.

The dust on the outer surface of the filter bag is shaken off and falls into the conical ash hopper at the lower part. At the end of the pulse valve injection, the dust collector continues to remain static, so that the fine dust in the cylinder has a static settlement process. At the end of this process, the outlet branch pneumatic butterfly valve and the upper ball valve are opened, the dust collector enters the normal filtering state, and the lower ball valve is opened through the impeller feeder The dust cleaning process of a box, the opening and closing of each valve in the above process, and the dust concentration test of a single box are all controlled by PLC system, so that the repeated work can purify the raw gas.


4.Dust collector in iron and steel plant

The filter bag made of porous filter cloth is used to separate the dust particles from the flue gas flow. When working, the flue gas flows through the filter bag from the outside to the inside, and the dust particles are blocked outside the filter bag.

The iron and steel industry is a major air polluter. The waste gas management of iron and steel industry implements the principle of comprehensive management. Efforts should be made to reduce energy consumption and raw material consumption, which is one of the fundamental ways to increase the emission of waste gas; the process, adopted process and equipment should be innovated to increase the emission of waste gas from consumption process; energy-saving management methods and equipment should be adopted to strengthen the management and recovery of waste gas; comprehensive use should be vigorously carried out.

At the present stage, a large number of flue gas will be discharged from the sintering machine of large steel plants in China, which will contain nitrogen, sulfur dioxide, dioxin, dust and other substances. Taking the sintering machine of 280 square meters as an example, the content of dust discharged into the atmosphere is 150mg / Nm3. According to this calculation, it will cause great pollution to the environment. At present, China has formulated detailed requirements and standards for energy conservation and emission reduction, and put forward suggestions for environmental protection According to the current standard of our country, the dust concentration discharged into the atmosphere is less than 50mg / Nm3, and the bag filter is an important part to achieve this requirement.

Main structure of dust collector in iron and steel plant:
1. The dust collector is divided into 24 chambers, arranged in two rows, with the main air inlet and outlet ducts in the middle. There are partitions between the silos to realize off-line ash cleaning.
2. A wind shield is set between the air inlet of each bin and the filter bag, and the air inlet mode is adopted inside the box.
3. Each bin is equipped with manual butterfly valve, and the outlet is equipped with pneumatic air stop valve. It can realize off-line ash cleaning and the maintenance of single bin and the air volume distribution of each bin under the condition of non-stop.
4. 216 filter bags are set in each bin, and the size of filter bag is 120mm × 6000mm. There are 5184 silos with a total filtration area of 11716m2.
5. The octagonal star section is adopted for the filter bag frame. Compared with the circular section, it can enhance the ash cleaning effect, reduce the wear between the filter bag and the frame, help to prolong the service life of the filter bag, and facilitate the extraction and insertion of the filter bag frame.
6. The material of filter bag is polyester needle felt.
7. A set of injection device is set in each bin, and the injection pipe and the outlet of pulse valve are inserted to facilitate disassembly.
8. The electromagnetic pulse valve is dmf80 straight through fast pulse valve, and its pressure output port is double twisted wire structure.
9. The top of the upper box body is provided with a water falling slope (20:1) and a water falling trough to prevent water from accumulating on the top cover.
11. Each bin is equipped with an ash hopper, a wall vibrator and a manhole.
12. The lower opening of the ash hopper is provided with a manual gate valve and a star type ash discharge valve, the former is used for repairing the star type unloader.



Cement -- Matching dust collector of filter bag

1.Dust collector of cement mixing station

The dust remover of cement mixing station is a new type of pulse bag type dust remover which introduces new equipment and new technology and improves by digestion. The dust collector of cement mixing station has the advantages of large air volume, high purification efficiency, small floor area, small wear of filter bag, long service life, simple filter bag replacement and convenient maintenance. The pulse reverse flow back blowing is used for ash cleaning. The electrical control adopts sequence controller, which has reliable performance and can be widely used for the flue gas purification of asphalt concrete industry. In recent years, the dust removal equipment of asphalt mixing plant has been widely used in various provinces and cities in China, and replaced by them, which is popular with users.

The dust collector of cement mixing station adopts Nomex dust bag to make the dust concentration discharged into the atmosphere less than 50mg/nm3, which meets the environmental protection requirements. The shell of dust remover in asphalt mixing station is insulated by rock wool, which can prevent the condensation of dust bag.

Working principle of dust collector in cement mixing plant:

The dust containing gas enters the bag filter from the air inlet, and then filters through the outer surface of the filter bag. The purified gas flows from the inside of the filter bag to the upper chambers, and is discharged from the air outlet through the Changwen tube. When the value reached, pulse blowing is carried out by the program control regularly when the dust adsorbed on the outer surface of the filter bag is reached. That is, the high-pressure air is sprayed to the Changwen tube, and the purified gas is blown back into the filter bag to form a large pressure difference, and the dust is cleaned down to achieve the purpose of cleaning the dust, and the resistance of the whole equipment and system is kept stable, The dust from the back blowing falls to the bottom of the lower box and is discharged and recycled by the screw conveyor.

The features of the dust collector in cement mixing plant are as follows:

1. The dust remover of cement mixing station adopts pulse back blowing ash cleaning method, which is one of the best cleaning effects in China. The box on the equipment is separated into 18 chambers which are not connected with each other, and is connected with a Changwen pipe. The purpose of ash cleaning is achieved by using program controlled pulse. The small venturi tube at the top of the spray pipe and filter bag is cancelled in structure. The structure is simple, and the operation and maintenance are convenient.

2. Compared with other dust collectors in China, the dust removal equipment in asphalt mixing plant has the characteristics of large air volume and small system resistance, and has a wide range of applications( Purification and recovery of mixed gas with dust concentration of less than 60g/m3 at room temperature and high temperature)

3. The flower plate edge of the upper middle box is pressed into a conical hole, which makes it contact with the filter bag with a smooth surface, and has good sealing property, and reduces the wear between the hole edge and the filter bag.

4. The dust collector of cement mixing station is simple and reasonable in structure, and covers a small area, and can be installed indoors and outdoors. According to the production process, the air volume, the user can choose the model or parallel combination, and provide carbon steel or stainless steel dust remover as required.


2.Dust collector in cement plant

According to the pore size of cement, fly ash, stone powder, mineral powder, chemical powder and other powdery substances, the filter element of industrial dust collector is designed. The influence of large diameter and adhesion on the pore size of filter element can meet the filtering requirements of various powdery substances. It can not only meet the requirements of bulk truck air delivery and air delivery after the unpacking of finished products, but also ensure that there is no negative pressure in the bin when the powder materials are used. It has the advantages of small volume, compact structure, filtration area of 24 m2, small volume, vibration cleaning, using German filter material.

The dust remover of cement plant is mainly used to collect all kinds of powder materials in silo.

Working principle of dust collector in cement plant:

The special dust collector of cement plant ionizes the flue gas by high voltage electric field, and the charged dust in the air flow is separated from the air flow by the electric field. Negative is made of metal wires with different cross-section shapes, which is called discharge electricity. It is made of metal plates with different geometric shapes, which is called dust collector. The performance of dust catcher in cement plant is affected by three factors: dust property, equipment structure and flue gas velocity.

The dust catcher of cement plant will also cause excessive discharge due to the damage of filter bag. The dust collectors in the cement plant are more than 10 bag rooms. It takes 5 ~ 30 minutes to determine the location of the broken bag from the discovery of excessive discharge. At present, the service life of dust removal filter bag is more than one year, and the broken filter bag only occurs after one year. If it is found out that the damaged filter bag is located in the bag room, as long as the bag room is closed and replaced, other bag rooms can still operate normally. Generally, closing 20% bag chamber will not affect the production of process equipment and the dust removal efficiency of dust removal facilities. Timely detection of filter bag damage is the key to reduce excessive emissions, which can only rely on the timely alarm of online continuous detection equipment. It is generally believed that if the bag filter is broken, it can be found when a small part of the bag filter is damaged, and other filter bags will also play a role. The excessive emission is far less than that of the electrostatic precipitator when CO exceeds the standard.

Advantages of dust collector in cement plant

The range of gas treatment is large.

It can realize automatic control of operation.

The allowable operating temperature is high, such as shwb circuit dust collector, the allowable operating temperature is 250 ℃, and other types can reach 350 ~ 400 ℃ or high.

The resistance loss is small, generally below 20 mm water column. Compared with cyclone, the total power consumption is still small even considering the power consumption of power supply unit and rapping mechanism.


3.Dust collector on top of cement bin

The dust remover on the top of cement bin is a kind of single dust removal equipment with automatic ash cleaning structure. This kind of dust remover is widely used in the fine, non fibrous dry dust in the filter gas or a dust removal equipment for recovering dry powder in the process flow in cement, mineral powder, mining, metallurgy, building materials, machinery, chemical industry, grain processing and other industrial and mining enterprises.

Working principle of dust collector on the top of cement silo:

The dust filter of the dust collector on the top of the bin is carried out through the filter element. The filter element material is glass fiber. When the dust containing air passes through, the solid phase can be used to separate from the gas phase. The filter element of glass fiber is a porous dust filter material. When the air flow passes through, the particles in the air flow can be absorbed on the filter element or settled down due to vibration and the purified air can be discharged, In order to attach and sink the dust into the filter element, the dust collector shall be vibrated in sequence when the fan of each shift is stopped (every 2-4 hours), and the dust collector shall be vibrated for about 5 times.

The main structure design of dust collector on the top of cement silo is the spatial frame structure set by beam element. Therefore, all kinds of loads to be investigated can be simplified to equivalent joint force acting on the beam element node. Because the nature of beam element determines, each beam can be treated as a unit and some secondary beams can be deleted, The calculation amount of the corresponding stiffness and load will be reduced greatly when added to the main beam. The finite element model given here is shown in figure 10-. But it is pointed out that the displacement mode of finite element beam is actually given according to the formula of straight beam in material mechanics. Under the assumption of material mechanics, the internal force and displacement of two ends of the beam are obtained by finite element analysis. Meanwhile, its deformation form is half wave, which is obviously not enough for the analysis of non-random, which is because if a beam is a unit, The instability critical load of beam half wave can only be given by the finite element analysis of its structure, which may lead to the progress of the critical load of the structure and the structural analysis. Therefore, this problem is noticed when modeling the main structure of ESP. The solution is simple. Only some elements (generally one beam is divided into more than 3 elements) are required for some possible stable main beams. In the analysis of non-random, it is necessary to avoid only allowing the half wave instability of the fixed European tie rod at both ends to rise, thus increasing the reliability of the calculation results.


4.Dust collector of dryer

The dryer dust remover is specially designed for Φ one point five × 12m、 Φ one point five × 15m、 Φ two point two × 12m、 Φ two point four × The new product developed by the development of flue gas dust removal of drying machine with 16m and other specifications is adopted. The new technology of vertical kiln fiber bag dust removal won the ministerial science and technology progress award of 1989 is adopted for the dryer dust remover. The computer controls the back blowing, timing, fixed resistance ash cleaning and temperature detection display of the chamber, so as to make the glass fiber bag dust remover operate stably in the drying flue gas dust removal, The discharge concentration at the chimney outlet is lower than the specified discharge standard of 150mg/m3n (it can be guaranteed to be less than 100mg/m3n in practice). The equipment can be used for changing bags in separate rooms without stopping. It is simple and reliable to operate. It is used in silicon iron furnace, industrial electric furnace and low operating cost. It is an ideal equipment for flue gas dust removal of domestic dryers.

The dryer dust collector is a dust collector specially used to deal with the exhaust gas of the dryer. The dryer is based on the front hot air stove drum into the hot air to carry on the rolling drying of the material. Because the hot air stove in front of the dryer adopts the coal-fired method, the exhaust gas produced contains a large amount of SO2 and water vapor, which is easy to condensation and produce strong corrosiveness. Under the condition of high temperature and oxygen enrichment, it is also easy to generate H2SO3 with strong corrosiveness. Therefore, the waste gas treatment of the dryer is a serious problem which is a serious problem for production. The above characteristics of exhaust gas should be paid attention to when dealing with such gases. In view of this working condition, our company has carried out special treatment on the dust collector. The flower plate made of ordinary 325 steel plate is replaced with stainless steel. The filter bag is selected, the treated filter bag is fluorous, and the skeleton is made of silicone (or stainless steel). The dust collector is treated with three layers of epoxy polyester anticorrosive coating. The outer layer is insulated with 10 cm thick light rock wool and color steel plate. After the above improvement, the dust collector can meet the working conditions of the dryer.

Operation characteristics of the dust remover of dryer:

Bag filter is stable, simple to maintain and reliable in operation. It can remove dust with 0.1 micron particles, and the dust removal efficiency can reach 99%. The bag filter is used for the exhaust gas of dryer without considering the problem of exceeding the discharge concentration. The dryer anti condensation glass fiber bag dust remover is an ideal dust removal and purification equipment at present.

The dust collector of dryer is controlled by microcomputer, with back blowing in the chamber, cleaning dust at regular time, and equipped with temperature detection and display, over temperature alarm device. Cw300-fca anti condensation glass fiber filter bag is adopted to prevent the filter bag from condensation and will not burn the filter bag. Diameter 3 × The two-stage dust removal process is changed to lfef7 by 24m slag dryer × 358-hsy / h anti condensation bag dust collector, determined by environmental protection department, has a waste gas volume of 42621 standard cubic meters per hour, dust concentration of 69620 mg per standard cubic meter, and dust concentration of 147mg per standard cubic meter at the outlet, which meets the emission standard.

Application of dryer dust remover:

Under the normal condition of ash cleaning, the remaining ash layer remains stable, that is, the resistance is basically the same before and after ash cleaning, which overcomes the phenomenon of resistance accumulation with the increase of operation time. This kind of wind stopping and shock vibration beat



Carbon black industry--Dust removal equipment for carbon black industry

1.Carbon black dedusting equipment

Carbon black dust removal equipment is a kind of dust remover equipment, with dust removal efficiency of more than 95%, and the resistance of dust remover body is lower than 900pa. The normal operation of boiler can be ensured by using the existing boiler induced draft fan. The load adaptability of carbon black bag dust remover is good. At 70% load, the dust removal efficiency is over 94%, which has the characteristics of corrosion resistance.

The filtration process of carbon black dust removal equipment is mainly carried out in the stage. Therefore, the dust removal equipment in carbon black industry has high efficiency, mainly by the role of dust layer formed on the filter material. The filter cloth is mainly used to form and support the dust layer. In addition, the primary layer of dust should be kept during the dust cleaning. Excessive ash removal will cause significant reduction of efficiency and accelerate the damage of filter bag.

Because of its high temperature and high corrosion, the production process of carbon black is more complex in the selection of dust remover. According to the advantages of large air volume, small area of dust removal bag, long service period and simple operation of equipment, our company has many years of carbon black bag dust remover.

There are 33 specifications for carbon black dust removal equipment. There are 32, 64, 96 and 128 bags in each room. The filter bags are 2450mm and 3060mm in length. The dust collection efficiency can reach above. The dust concentration of the purified gas is less than 100mg/m3 (standard). If the dust collector is used in cold areas, when the outdoor heating calculation temperature is < - 25 ℃, heat device shall be set.



2.Dust collector for carbon black plant

Due to the characteristics of high temperature and high corrosiveness, the selection of carbon black bag filter is more complex. Our company has many years of experience in carbon black bag filter, such as large air volume, small floor area, long service life of bag filter, simple equipment operation and so on.

There are 33 kinds of specifications of carbon black plant dust collectors. There are four kinds of bags in each room, including 32, 64, 96 and 128 bags. There are two kinds of filter bag length, 2450 mm and 3060 mm. The dust collection efficiency can reach above, and the dust concentration of purified gas is less than 100 mg / m3 (standard). If this series of dust collectors are used in cold areas, when the calculated temperature of outdoor heating is less than - 25 ℃, heat devices should be set.

The dust remover used in carbon black plant is a new type of dust remover. The dust removal efficiency can reach more than 95%, and the resistance of the dust remover body is lower than 900pa. The normal operation of the boiler can be ensured by using the existing boiler induced draft fan.

At 70% load, the dust removal efficiency is more than 94%, which has the characteristics of high efficiency and corrosion resistance. Carbon black bag filter or dedusting equipment is the equipment to separate dust from flue gas. The black carbon bag filter, also known as the filter type dust collector, is a kind of dry type dust collector. It is a dust removal device that uses the bag filter element made of fiber fabric to capture the solid particles in the dust containing gas. Its working principle is that the dust particles are intercepted when they bypass the filter cloth fiber due to the impact of inertial force with the fiber. Bag filter is a kind of dry dedusting device, which is suitable for collecting fine, dry non fibrous dust.

The filter bag of carbon black plant dust remover is made of textile filter cloth or non-woven felt. The filtering function of fiber fabric is used to filter the dusty gas. When the dusty gas enters the bag dust remover, the dust with large particles and large proportion will settle down due to the action of gravity and fall into the ash hopper. When the gas with small dust passes through the filter material, the dust will be retained and the gas will be purified. Generally, the dust removal efficiency of new filter materials is not high enough. After the filter material is used for a period of time, due to the effects of screening, collision, retention, diffusion and static electricity, a layer of dust is accumulated on the surface of the filter bag, which is called the primary layer. In the later movement process, the primary layer becomes the main filter layer of the filter material. Depending on the role of the primary layer, the filter material with larger mesh can also obtain higher filtration efficiency.

With the accumulation of dust on the surface of the filter material, the efficiency and resistance of the bag filter increase correspondingly. When the pressure difference between the two sides of the filter material is very large, some fine dust particles that have been attached to the filter material will be squeezed to reduce the efficiency of the filter. In addition, the high resistance of the dust collector will significantly reduce the air volume of the dust removal system. Therefore, after the resistance of the dust collector reaches the value, it is necessary to clean the dust in time. The initial layer should not be damaged during ash cleaning to avoid the efficiency decline.





Chemical--Dust removal equipment for chemical industry

1.Coke oven smoke remover

According to the electric field theory, positive ions are adsorbed on the corona with negative charge and negative ions are adsorbed on the precipitation with positive charge; All ionized positive and negative ions fill the whole space between corona and precipitation. When the gas containing tar droplets and other impurities passes through the electric field, the impurities adsorbing negative ions and electrons move to the precipitation under the action of Coulomb force of the electric field, release the charge and adsorb on the precipitation, so as to achieve the purpose of purifying the gas, which is usually called charging phenomenon. When the mass of impurities adsorbed on the precipitate is greater than its adhesion, it will automatically flow down and discharge from the bottom of the electric tar catcher, and the net gas will leave from the top of the electric tar catcher and enter the next process.

The effectiveness of the treatment of coke oven smoke and dust remover is as follows

The coal material loaded into the carbonization chamber carries a large amount of air. At the beginning of coal loading, the oxygen in the air and the fine coal particles entering the furnace burn to produce carbon black and form black smoke. When the loaded coal contacts with the blazing furnace wall, a large amount of carbon, sulfur, nitrogen and compounds are produced, accompanied by water vapor and hydrocarbon organic matter, and the flue gas turns dark yellow. Some of them enter into the gas collecting pipe of coke oven, and the other part overflows through the top vent and the gap of the door, which accounts for about 60% of the total emission of coke oven.

In the process of coal loading, there are a lot of harmful substances such as pulverized coal, raw gas, sulfur and nitrogen oxides in the flue gas, including polycyclic aromatic hydrocarbons, such as benzopyrene, 7,12-dimethylbenzoanthracene, 3-Grade-A cholanthrene, dibenzo pyrene, dibenzo (AI) pyrene, etc. if not treated, it will cause serious pollution to the surrounding environment and worsen the working conditions, It causes great threat to the health of employees and violates the environmental protection policy. Therefore, it is necessary to take strong measures to strengthen the control of overflow flue gas during coal loading.

According to statistics, in the process of charging coal into coke oven, the pollutant emission of one ton of coal into coke oven is about 2.37kg, of which the main pollutants are solid particulate matter (TSP), benzopyrene (BAP), benzene soluble substance (BSO), sulfur dioxide (S02), etc. BSO emission is 0. The emission of BaP is 0.000908 kg / T coal and 499 kg / T coal. The harmful substances such as BAP have existed as the carrier of TSP. Therefore, the collection and treatment of TSP by pollutants is the key to control coke oven pollution.


2.Pulse bag type dust collector for coke trap system

The pulse bag filter of the coke blocking dust removal system adopts the two in one technology of coal loading and coke discharging dry dust removal, which combines the coal loading dust removal and coke discharging dust removal into a set of dust removal system. The coke powder adsorbed on the filter bag during the coke discharging dust removal process is used as the coating, so that the tar and dust in the inhaled flue gas during the coal charging process can not directly contact with the filter bag. The coke discharging dust removal and coal charging dust removal are operated alternately to ensure that the filter bag can be used for a long time without being stuck and blocked. The advantage of the system is that the two subsystems share one dust collector, one fan and one ash discharging and storing device.

The application effect of pulse bag filter in coke blocking dust removal system is as follows

(1) The dust concentration in the production area of coke oven is reduced by using the ground dust removal station system, and the production and operation environment of workers is purified. The coke oven dust treatment meets the emission standards of coking industry and environmental protection.

(2) After process improvement, the stability and reliability of the system are improved without any accident.

(3) Because of the simple operation and control, the service life of the system equipment is prolonged, especially the service life of the cloth bag. The system has been used for 18 months without changing the cloth bag, achieving the goal of economic operation.

(4) The successful application of the frequency conversion technology of the system not only saves the cost of electricity, but also ensures the stability of the main pipe suction of the system, which plays a key role in the stable operation of the whole dust removal system. At present, our company mainly applies three technologies: 1. Main tube belt car is used for coke blocking, and m-tube gas recovery technology is used for furnace top. 2. Main pipe belt car is used for coke blocking and smoke guiding technology is used for furnace top. 3. The pre spray bag is used for dust removal, and the double butt smoke guiding technology is adopted for the furnace top.



3.Pulse bag filter in ground station of coking plant

The coal loading and dust collection system consists of two parts. The top part of the furnace is a dust collection truck with dust collection device. It consists of movable smoke hood, smoke guide pipe, flue gas regulating valve, air control valve, valve, expansion connector and other components of smoke extraction system. Open the interface flap valve on the dust collection main through expansion connector. The flue gas emitted during coal loading is mixed with quantitative air, and sent to the ground station for purification treatment by dust collection main pipe and coke side dust removal. The other part is the ground station of dust purification with coal pushing and coal loading, and the fan, off-line pulse bag type dust collector, smoke exhaust unit with hydraulic coupling, dust collector recovery coke powder ash conveying device, corresponding electrical and instrument equipment, compressed air and cooling water system are set in the ground station.

The ground dust removal system of coking plant adopts the low-pressure ash cleaning method, and the spraying procedure and control time of filter bag are controlled by the electrical PLC system. The recovered dust can be sold out or pulled to the material yard for treatment. The design and treatment air volume of dust removal system is 60000m3 / h. under the condition of ensuring the dust removal effect and reliable operation of the dust removal system, the air volume is adjusted and determined according to the resistance of the dust removal system and the operation of coke oven.

The pulse bag dust collector of the ground station of coking plant adopts the domestic non combustion method of coal loading, and makes the collected coal loading dust enter the coal loading dust collection technology of dry dust removal ground station of coke side dust removal. It can capture the coal loading dust, transfer the flue gas from the top of the furnace and the ground station, regulate the temperature of the flue gas, and integrate the flue gas purification. The dust removal system of the coking plant uses the coke powder collected on the surface of the filter bag during the coke pushing process to prevent the dust from containing tar and water vapor binding filter bag during the coal loading process, thus ensuring the long-term stable operation of the equipment.

Advantages of pulse bag dust collector in ground station of coking plant:

1. The non combustion method is used to mix a large amount of air into the coal loading dust removal, which makes the combustible content of the dust far lower than the lower explosion limit, which ensures that the dust enters the dust removal system;

2. The dust removal system on coke side collects dry coke powder and gas energy to absorb harmful components, tar and water in the coal loading dust, without considering measures such as heat preservation, heating and condensation prevention of dust removal equipment;

3. The low pressure pipe jet pulse dust remover is used in the surface dust removal system of coking plant, which greatly improves the dust removal capacity of the dust collector, prevents dust from sticking the filter material, and increases the system resistance;

4. The system design fully gives full play to the purification and treatment capacity of ground dust removal equipment. Through the special design and control of fan and pipeline system, the coal loading dust removal and coke side dust removal can be combined into a system, which can greatly save the investment in transformation.


4.Pulse bag filter in coal preparation workshop

The pulse bag filter in the coal preparation workshop absorbs the advantages of the original pulse bag filter, changes the original ash unloading system, simplifies the structure, and has the characteristics of large gas processing capacity, good purification effect, convenient operation, small maintenance, stable performance and reliable operation. Compared with the mechanical vibration dust remover, it also has the advantages of low working noise, long service life of filter bag, no mechanical movement wear and so on. It is suitable to be arranged on the top of all kinds of powder storehouses to collect all kinds of fine dry non fibrous dust. It is a simple storehouse dust remover.

Working principle of pulse bag filter in coal preparation workshop:

The dust air enters the dust box from the bottom of the dust remover. The coarse particles of dust settle down by their own gravity and fall into the ash bin. The fine dust is absorbed in the dust of the filter bag through various effects. With the increase of time, the resistance of the dust remover increases gradually, and the amount of treated gas decreases continuously, To keep the pressure loss within a certain range, it is necessary to absorb the ash on the outside of the bag wall.

In the process of ash cleaning, the controller sends out instructions to each electromagnetic pulse valve according to the requirements, so that the filter bag can shrink, expand and shrink rapidly in an instant. In the process of ash cleaning, the pressure loss of the dust collector and the amount of dust gas to be treated are almost unchanged, which is one of the characteristics of the pulse bag filter.














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