Ceramic filter is a widely used filter, which uses rigid microporous materials as filter elements. It includes a series of filters such as ceramic, corundum, silicon carbide, sand chip, etc., as shown in the figure. The excessive airflow can cause dust to stick to the filter and cause blockage. In order to prevent the excessive airflow from directly blowing the ceramic cup, a protective cover is added to the outside of the ceramic cup to make the airflow bypass the lower part of the filter. Then enter the filter. In order to reduce the ineffective volume, the bottom of the filter is tapered and a branch joint is added. On the one hand, the dust can be blown away; on the other hand, the gas exchange is accelerated due to the continuous flow of gas and the lag time is reduced. In order to facilitate the replacement and cleaning of the filter, a ceramic filter system is designed. When one filter is clogged, the two four-way reversing valves can be turned to pass the sample gas into the other filter. The clogged filter can be blown back by high-pressure air to make the dust adhering to the ceramic filter cup Get rid of. In this way, the two filters work alternately. It is suitable for more important analysis systems and sampling systems with higher dust content that are prone to clogging. At present, ceramic filters are more and more widely used in many industrial fields, such as catalytic precious metal recovery, fluidized bed combustion, calcination, organic waste gasification power generation, building materials, chemicals, and high temperature in industrial processes such as various industrial kilns and furnaces. Flue gas purification. The application of high temperature flue gas purification will also appear in smelting, material production and glass manufacturing. These high-temperature soot purifications are often carried out under conditions close to atmospheric pressure.
The most prominent application of ceramic filters is the purification of soot in the field of coal-fired power generation. Because of the increasing demand for electric energy worldwide, coal is the main source of solving electric power problems. Regarding the non-renewability of such fossil fuels, maximizing the efficiency of power generation and reducing the pollution to the atmosphere has become a major task for all countries in the world, especially China, a large coal-burning country. Through circulating fluidized bed (CFBC) power generation and coal gasification (IGCC) power generation, and their combined power generation can achieve the purpose of improving power generation efficiency. Coal gasification power generation is different from the traditional steam generator power generation process. After the coal is heated and vaporized, the coal gas needs to be purified before it enters the gas-fired generator (gas-fired generator). That is, any dust or other impurities must be removed. Most power plants limit the allowable dust concentration entering gas-fired turbines to less than 5 mg/m3. In theory, it is better to be less than 1 mg/m3. The working temperature of the dust removal system is usually 350~1000℃, and the pressure is 1~2.5 SPa. Therefore, to achieve such a high purification effect under such high temperature and high pressure, ceramic filters must become the first choice.
How to treat the application of ceramic filter?
2020 08/03