Structural characteristics/working principle of dust collector in cement plant

Structural characteristics of dust collector in cement plant:

1. Shell part: including cleaning room (or gas purification box), filtration room, partition partition, access door and shell structure. The cleaning room is provided with a lifting valve and flower plate, and a spray pipe; The filter room is provided with a filter bag and its skeleton.

2. Ash hopper and unloading mechanism: The ash hopper can be equipped with screw conveyor, air conveyor chute and rigid impeller discharging device (ash valve) according to different series and different dust concentration.

3. Inlet and outlet air box: including inlet and outlet air pipe and middle partition board. The single-row (or single-row) structure is arranged on one side of the shell, and the double-row (or double-row) structure is arranged in the middle of the shell: 32 series is smaller without a box, and the inlet and outlet air pipes are respectively connected to the ash hopper and the cleaning room.

4. Pulse ash cleaning device: including pulse valve, air bag, lifting valve cylinder and its solenoid valve.

5. Compressed air pipeline and decompression device, oil-water separator, oil mist, etc.

6. Pillar and vertical cage ladder, railing.

The working principle of pulse bag dust collector in cement factory:

The dust-containing gas enters the human box through the filter bag, and is filtered through the filter bag. The dust is left on the inner surface of the filter bag, and the purified gas enters the fan through the filter bag, and is inhaled directly into the room by the fan (it can also be taken over and discharged outdoors). With the increase of filtration time, the dust attached to the inner surface of the filter bag also increases, and the resistance of the filter bag increases, thus affecting the dust removal effect. The automatic dust cleaning mechanism is used for periodic controlled vibration cleaning or hand-controlled flight cleaning mechanism is shaken for tens of seconds after stopping, so that the dust stuck in the inner surface of the filter bag is shaken off, and the dust falls to the ash door, drawer or directly onto the conveyor belt.

Processing of main parts

The main components of bag dust collector are box, top cover, flower plate, pillar, inspection door and so on. In order to ensure the quality, it must be used after the plate during the entire use process, and it is always shear or automatic cutting, which ensures the roughness of the incision surface and lays the foundation for the next process to ensure the quality.

The top cover, box, ash bucket are large sheet structural parts, in order to facilitate transportation and installation, in the company's manufacturing in the field assembly and welding, can reduce deformation.

Bag dust catcher flower plate, the thickness is generally 6mm, each piece of flower plate according to the need to open holes, according to the design requirements, the holes should have good versatility and interchangeability, the surface of the flower plate is flat, there should be no burrs around the punching, the Angle, the method we take is the pliers number diameter 30 positioning holes, the precision of the hole distance, and then the riveter on the flower plate on the platform for leveling, so, The above technical requirements are guaranteed. Check the door with silicone seal.

Main process of system

1. Air intake system The air intake system includes air intake, air intake throttle valve, windscreen plate, air deflector plate, etc. The dust-containing gas is carried out in each bag room through the transmission network.

2, the ash filter system includes filter bag, bag cage, flower plate, etc., each filter bag is set on a bag cage, the purpose is to prevent the cloth bag from being flattened, flower plate is used to support the filter bag assembly and separate the bag room and the clean air chamber. It is also used as the maintenance platform of dust filter system.

3, ash cleaning system, by the electromagnetic pulse valve time blowing ash.

4, the installation work must be carried out in strict accordance with the requirements of the drawings, generally from the bottom to the top, first the lower bracket, ash hopper, etc. installed properly, bracket, ash hopper fixed after hoisting the box and the upper box, bag cage and filter bag in the dust collector installation quality inspection can be installed, and should be installed under the guidance of the supplier.

5. Install the power supply and control line according to the wiring requirements of the ash cleaning control or control cabinet, and then test the whole machine.

Maintenance and overhaul

1. The dust collector should be operated and repaired by special personnel, the performance and structure of the dust collector should be fully grasped, and the problems should be dealt with in time to ensure the normal operation of the dust removal system.

2, found that the outlet dust concentration increases, indicating that the filter bag has broken leakage, maintenance, should first close the fan, etc., and then open the top cover, if there is ash at the mouth of the bag, it means that the filter bag has been damaged, to be replaced or repaired

3, the dust collector resistance is generally 1800Pa-2500 Pa, the cleaning cycle can be adjusted according to the resistance with the adjustment knob of the controller.

Cement plant dust collector with what bag is good, cement plant emissions of dust containing gas, according to the process is different, dust bags need to have different characteristics. Cement plants have room temperature, but also high temperature, high humidity, high concentration, with combustion, explosion characteristics of dust, its temperature fluctuation is large, such as the kiln cloth bag dust collector, not only to prevent paste bag, but also to prevent burning bag; Therefore, when selecting dust bags, different filter materials should be selected for different working conditions, and corresponding technical protection measures should be taken.

Under normal temperature conditions, polyester dust bag and polyester waterproof dust bag can be used.

Under the high temperature working environment, the kiln head generally uses PTFE acid-alkali resistant aramid dust bag or glass fiber composite dust bag, and the kiln end generally uses aramid film dust bag, alkali-free glass fiber expanded film dust bag, glass fiber film composite dust bag.

1, high temperature, for example, the dust emitted from the tail of the rotary kiln is a very high temperature, up to 400 degrees, so it must be processed by tempering and cooling;

2, high humidity, such as mechanical shaft kiln, dryer, the temperature often changes, the moisture content is as high as 20% or more;

3, high concentration, with the vertical mill, high efficiency powder separator supporting the bag dust collector, the dust concentration of the dust containing gas can reach 700-1600g/m3, the bag dust collector is the production of dust collection equipment in the process of industrial production, but also the dust emission control of environmental protection equipment.

4, fire and explosion proof, such as coal mill discharge rich in coal dust gas.

Dust bag is also known as dust filter bag is made of filter material, also known as dust filter bag, alias dust bag, it is used in the bag filter above, used to filter the dust in the air, so that the air is purified a filter bag, dust filter bag shape is round, one head is the filter bag mouth, one head is the bottom of the filter bag, the filter bag mouth is installed on the flower plate of the bag filter, During the operation of the bag filter, the dust is attached to the outside of the filter bag, the air passes through the pores of the filter cloth and enters the inside of the dust filter bag, the dust bag cage is used to support the filter bag, the dust filter bag collapses during the negative pressure operation, and the dust bag can also have good support when the bag dust collector is removed.

The selection of filter material is an important issue, which directly affects the dust removal effect of the dust collector, and the selection of dust bags from the following aspects: gas temperature, humidity and chemistry, particle size, dust concentration, filtration wind speed, dust cleaning methods and other factors.

Dust filter bags have polyester, polypropylene, acrylic, Metas, Flumas, glass fiber and other materials, for the diversity of filter material after treatment, but also have singeing, calender, heat setting, Teflon treatment.

Dust filter bag is widely used in the flue gas treatment dust removal system of ironworks, steel mills, ferroalloy factories, refractory factories, foundries, power plants, etc. Flue gas filtration of incinerators, coal-fired boilers, fluidized bed boilers, etc.