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Application of high efficiency filter in power plant!

Time : 2023-06-28 Hits : 2

The reason why the high-efficiency filter plays a certain role in ensuring the production safety of the power plant is that in the process of power generation, the silicon content of the boiler water is an important indicator in the chemical supervision. The excessive silicon content of the boiler water will affect the steam quality, and in serious cases, scale may be generated, which may lead to local overheating of the boiler heating surface and tube explosion accident. While the high-efficiency filter can alleviate scaling and calmly avoid dangerous accidents of the power plant. Excessive silicon in boiler water will increase the boiler blowdown rate and increase the heat loss of blowdown, which is not conducive to energy saving and consumption reduction. Colloidal silicon in raw water can easily lead to excessive silicon in boiler water of power plant, which can be solved by flocculation and high-speed filter. Here is a practical case of high efficiency filter used in power plant for reference. The 480t / h circulating fluidized bed boiler equipped with 2x150mw heat supply unit in a thermal power plant once had the problem of exceeding the standard of boiler water silicon. The main reason is that the raw water used in the chemical water production workshop contains colloidal silicon that cannot be completely removed by the ion exchange system. After entering the boiler, the colloidal silicon will be converted into dissolved silicon compounds under high temperature and alkaline conditions. In addition, the boiler water concentration effect of the heat supply unit is stronger, resulting in serious exceeding the standard of boiler water silicon, This will lead to an increase in emissions, which is neither energy-saving nor safe. By improving the high-efficiency filter and adding flocculant in front of the high-efficiency filter, the problem of excessive silicon in boiler water was solved. According to the analysis of engineering test and water sample detection results, since the raw water contains colloidal silicon that is difficult to detect and remove, if no flocculant is added, the colloidal silicon will enter the boiler water system and be converted into soluble silicon, resulting in the boiler water silicon exceeding the standard. After adding basic aluminum chloride purple coagulant in front of the high-efficiency filter, the high-efficiency filter removed 20. 4% soluble silicon and 43.5% colloidal silicon. This is mainly because some flocculent precipitates with small particle size have not been removed by the high-efficiency filter, but the charging performance of these colloidal silica has changed under the action of the flocculant. Since the original colloid that does not reflect the charge property has become charged flocculation and precipitation fine particles, because of the charge, it can be adsorbed and removed in the subsequent ion exchange system. Of course, the soluble silicon can be removed by the ion exchange system, so the total silicon content in the final demineralized water is very low. In the chemical water treatment system of power plant with high-efficiency filter and ion exchange, if the raw water contains colloidal silicon, adding flocculant in front of the high-efficiency filter is a necessary means to control the silicon of boiler water to meet the standard. In addition, the optimal addition ratio of flocculant can be determined through experiments. After testing and analysis, the thermal power plant determined the best working condition of adding flocculant, and completely solved the problem of excessive silicon in boiler water

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