First, bag type dust removal equipment technology
The design and selection of bag filter has been changed from high filtration speed, high resistance and short life to high efficiency, low resistance and long life. It pursues the comprehensive effect of energy saving and emission reduction, which is embodied in the dry dust removal of blast furnace gas. Coal-fired power plant boiler flue gas dedusting, cement kiln kiln tail flue gas dedusting, waste incineration flue gas purification field rapidly promoted the application of bag type dust removal, and achieved remarkable results;
In the dust control project, the emission concentration is lower than 10mg/Nm3; the system resistance is lower than 1000Pa; the filter bag has a good cleaning effect on average; the life of the pulse valve diaphragm is greatly prolonged, and it is common to use 3 to 5 years. It has been common to have a service life of more than 4 years. Pulse cleaning bag filter techniques are used to obtain good results in various industrial fields, the critical components of the impulse valve in certain aspects more than foreign products, to obtain a more rapid large dust bag device for steel Bag-type dust removal equipment in cement and power industry. Many single-machine treatments have more than 2 million m3/h of flue gas, and the filtration area exceeds tens of thousands of square meters. Among them, the bag-type dust collector of the power industry has the largest amount of smoke treatment. 3 million m3/h, the filtration area is mostly 40,000 to 50,000 m2. Of course, many new technologies have been injected at the same time as the equipment has been enlarged, and the bag dust collector has made significant progress in airflow distribution, airflow organization and reasonable body structure and safety. The manufacturing equipment and manufacturing technology of China's large bag filter have also made great progress, the scale is getting bigger and bigger, the equipment is more and more specialized, many bag dust removal processing enterprises have built CNC machining centers, and the production precision is greatly improved. Special equipment and special processing machinery are widely used in the bag dust removal industry. The production of flower plates is laser cutting, and the multi-point welding machine is widely used in bag cage processing. In recent years, there is no bag dust removal processing enterprise in the world like China. The bag-type dust-removing enterprise has developed so fast and professionally, so it also drives the export of the bag filter and the external processing.
Second, the size of the bag filter
The most significant sign of bag dust removal technology is the large-scale equipment, but the large-scale equipment is not a simple volume increase, involving the modular design, manufacturing and installation of equipment, air distribution and regulation, long-term operation of the cleaning system. Reliability, long life of the filter bag, etc. China's thermal power industry single-unit capacity from 100MW, 200MW, 600MW to 1000MW; cement industry single production line from 3000t / d, 4000t / d, 5000t / d to 12,000t / d; steel industry single-seat blast furnace capacity from 700m3, 1000m3, 2000m3 to 4000 ~ 5300m3. China's scientific and technological personnel have given full play to their ingenuity and talents, and constantly research and development to quickly follow up, so that China's bag filter is rapidly increasing in size, and the air volume is increased from 100,000 m3/h to 1 million m3/h and 2 million m3/h. Up to 3 million m3/h or more; the filtration area is from 2000m2, 10,000m2, 20,000m2 to 50,000-60,000m2; in the process of large-scale bag dust removal, the equipment resistance is greatly reduced, from the previous 1500~1800Pa to 1200Pa Even below 1000Pa; the filtration efficiency is stable and effective, and the dust concentration is below 10mg/Nm3. The concentration of soot in the domestic waste incineration industry and blast furnace gas purification is generally below 10mg/Nm3. It is precisely because of the large-scale bag dust removal equipment that it has provided great support for China's industrial energy conservation and emission reduction in the corresponding stages of industrial development in China, which has made great achievements in China's economic development and environmental control at the same time. Without the rapid development of bag dust removal technology, China's atmospheric environment will be worse than now. As we all know, the enlargement of any industry equipment is not a simple way to grow bigger, but there is a corresponding need for a large number of technological advances, and most of them are based on the breakthrough of certain key technologies. The large-scale bag-type dust collector was developed on the basis of major breakthroughs in filter material development and filter bag manufacturing technology, cleaning technology and equipment, air distribution technology, machine processing and equipment technology. And iron and steel, metallurgy, cement, power industry, large-scale equipment, like equally large bag dust removal equipment is based on the industry to improve the overall level of China's top; at the same time, it also contributed to improve the overall level of China's industry. The entire production line of the cement industry, including dust removal equipment, is widely promoted abroad.
1. Cement industry
The cement industry is one of the heavily polluting industries. In the past, 1 to 2 kilometers around the cement plant will have a thick layer of cement dust. In 2004, when a 5000t/d cement production line was rebuilt in a cement factory in Guangzhou, domestic scientific and technical personnel developed a large-scale low-resistance long-bag online/off-line pulse dusting dust collector based on accumulated dust collection experience for decades. The treatment air volume is 1 million m3/h, the flue gas temperature is 240 °C, the service life of the filter bag is 6 years, the equipment running resistance is less than 1200 Pa, and the soot emission concentration is below 10 mg/m3; it meets the internationally stringent environmental protection requirements, not only It satisfies the requirements of this production line, and clears the major environmental obstacles for the cement plant's soot emission compliance to the technical promotion of China's 5000t/d to 12,000t/d production line. In recent years, the whole process line of the cement industry adopts bag dust removal technology, especially the kiln head and kiln tail are changed from electric precipitator to bag type dust collector, which makes the cement factory area change the past mess. Many cement factories have Become a garden-style cleaning factory.
2, the steel industry
The steel industry is also one of the heavily polluting industries. The typical representative of the advancement of dust removal technology in the steel industry is the dust removal and purification of blast furnace gas. The blast furnace produces a large amount of blast furnace gas in the iron making process, and the blast furnace above 5000 m3 produces about 50,000 m3 of blast furnace gas per hour. The blast furnace gas contains a large amount of CO and a small amount of hydrogen, which is a valuable energy source; however, the crude gas contains a large amount of dust, which must be purified before it can be applied. CO and hydrogen are explosive, and CO has high toxicity, and the purification process is highly dangerous. The traditional blast furnace gas adopts the venturi wet method to reduce dust. This method not only has large heat loss, low purification efficiency, but also consumes a large amount of water resources and produces polluted water. In the 1990s, Chinese scientists and technicians took the lead in researching and purifying blast furnace gas bags in the world. China's research and development of pulse cleaning blast furnace gas purification bag type dust removal technology, using inert gas cleaning and ash conveying technology, fundamentally avoids the explosion hazard of blast furnace gas dry purification. The technology has high efficiency and stable purification efficiency, and the net gas dust content is less than 5mg/m3, which fundamentally removes the gas mud, avoids the huge facilities of sewage treatment and serious pollution to the environment, and fully utilizes the pressure energy of the blast furnace gas. The heat energy increases the residual pressure power generation by 30% to 50%, energy saving by 40% to 50%, water saving by 80% to 90%, saving investment by 30% to 40%, and reducing operating energy consumption by 60% to 70%. This technology is internationally leading.
3. Power industry
The national “10th Five-Year†and “863†projects jointly completed by many units in China: 20MW unit of Jiaozuo Power Plant was converted into dust removal by bag, dust removal from bag of 600MW unit of Zhangjiagang Shazhou Power Plant, and dust removal of Baosteel's own power plant was changed to bag dust removal. Gaoqiao 30MW×4 unit electric dust removal is changed to bag dust removal, etc. It is a typical coal-fired power plant bag dust removal technology application, which shows that the thermal power industry can effectively control soot emissions and achieve national and local emission of less than 30mg/m3 or even 20mg. The goal of /m3 has broad prospects. The system resistance of these projects is less than 1200Pa, some are still lower than 800Pa, the soot emission concentration is lower than 20mg/m3, and the filter bag life is up to 5 years. The air volume of the 600MW unit bag is 3.6 million m3/h and the filter material is 60,000 m2.
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