Effective disposal methods of bag filter in boiler purification in China
Since China's reform and opening up, the cement industry has developed. In 1978, the cement output was 65 million tons. In 1985, it reached 146 million tons, and it jumped to the world; in 2011, cement production reached 2.063 billion tons, accounting for about 60 of the world's total cement output. my country's cement production has been maintained for 20 consecutive years. There are many dust sources in the cement industry, such as crushers, mills, powder separators, conveyor belts, silos, storage items, storage bottoms, packaging systems, dryers, coal mills and coolants, shaft kilns, rotary kilns (Kiln head, kiln tail) and kiln, mill integrated machine, etc., all produce a lot of smoke and dust, especially shaft kiln, the smoke and dust emission is very large. Therefore, dust removal is an increasingly important link in the cement industry.
The bag filter is one of the oldest dust removal methods, and it is also the most efficient dust collector in the world. It has the following advantages: ① dust removal, up to 99.9% or more; ② less auxiliary equipment, less investment, and technical requirements not as high as that of an electric precipitator; ③ can capture dust that is high in specific resistance and difficult to recover by an electric precipitator; ④ bag dust removal The device has stable performance, good adaptability to load changes, simple operation and management, and is particularly suitable for capturing fine and dry dust. The collected dry dust is easy to process and recycle; ⑤ It is suitable for the new theory of dust removal in the whole production process and reduces total emissions . Therefore, bag dust removal has become the most important dust removal method in the cement industry.
However, the disadvantages of the bag filter are also obvious. For example, the filter bag is easily affected by the gas temperature and humidity. The temperature is too high and the bag is easy to burn, and the humidity is too high. The service life of the bag is relatively short. This causes the cement industry to produce a large number of waste dust collection bags every year. Since most of these filter bags are made of synthetic chemical fiber raw materials, they have poor biodegradability and are difficult to be degraded in nature. And because of the currently unavailable disposal methods, random stacking becomes a new source of pollution, causing damage to the environment and ecology, and severely restricting the sustainable development of the cement industry. Therefore, how to dispose of the damaged waste filter bags has become an urgent problem that needs to be solved.