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Environmental protection dust removal equipment. Domestic bag dust collectors are widely used in mining, cement, metallurgy, iron and steel, food, machinery and other industries. In thermal power plants in the power industry, the single bag dust collectors are only used in coal transportation systems and pneumatic dust removal.
Bag dust collectors have not been substantially and widely used in the tail dust removal of power plant boilers. Only in the near future are 670t / h boilers in Hohhot Power Plant, 75t / h boilers in Tianjin Development Zone No. 5 heat source plant, and 130t / h thermal power plants in Zhangjiagang Free Trade Zone The boiler, the 75t / h boiler of Chifeng Fulong Power Plant in Inner Mongolia, etc. have been used in the dust removal at the tail of the power plant, and have achieved good dust removal effects.
Among them, due to the use of Zhungeer coal in the Hohhot Power Plant, SiO2 and Al2O3 are too high, and K2O and Na2O are too few. It is difficult to collect dust using an electric precipitator. The operating efficiency of the electric precipitator used is much lower than the design efficiency, and the emissions exceed the standard seriously Two 200MW units were expanded annually. After several experts' demonstrations, it was decided to use a large-scale domestic pulse bag filter. The first 200MW unit was put into operation in early 2002, and the bag filter was operating in good condition.
In the process of introducing and digesting foreign bag dust collector technology, through the Global Environment Facility "GEF" project, we introduced the design and manufacturing technology of coal-fired boiler bag dust collectors of the United States EEC Environmental Technology Corporation, which has been the leader in the North American air pollution control system for more than 50 years. , To fill the gap in the current successful application of bag filters in the domestic boiler industry, and can replace imports. Adopt the boiler long bag pulse dust collector with unique structure, advanced dust collector inlet air guide
Patented technology, with advanced three-state dust cleaning device, the normal service life of the filter bag is three years, the smoke emission concentration is generally less than 50mg / Nm3 or even lower. In Tianjin Development Zone No. 5 heat source plant, Zhangjiagang Free Trade Zone Thermal Power Plant, and Inner Mongolia Chifeng Fulong Power Plant, the improved off-line dedusting pulse bag filter has been used to achieve a good dust removal effect.
As China pays more and more attention to environmental protection, the current GB13223-2003 version of "Emission Standards for Air Pollutants of Thermal Power Plants" has been issued by the State Environmental Protection Administration. In the third period, the allowable emission concentration of soot has been reduced from the original standard of 200mg / Nm3 to 50mg / Nm3, some coal types will not meet the emission standard requirements by using electric dust collectors, and need to use bag dust collectors. It is expected that more and more bag dust collectors will be used in thermal power plants in the future, with broad application prospects.
Beijing has recently published the "Beijing Boiler Pollutant Comprehensive Emission Standards" DB11 / 119-2002, which has been implemented since March 1, 2002. The allowable concentration of soot and SO2 emissions is stricter than many advanced national standards. In hosting the Olympic Games in 2010, Beijing wants to become a world metropolis. Since November 1, 2005, the soot emission concentration of the boilers of thermal power plants that have been in operation is only allowed to be 30mg / Nm3. At present, the four-field electric precipitator should be changed to five-field, six-field or bag filter. Other big cities such as Shanghai, Tianjin, Chongqing, Guangzhou, Wuhan, Chengdu, Shenyang and other cities are also successively formulating local environmental protection standards, which will be stricter than the national standards. Since then, the market space for the use of bag dust collectors in thermal power plants has been increasing. .
In addition, due to the vigorous promotion of the new clean coal combustion technology-circulating fluidized bed boilers in thermal power plants, the fly ash circulating combustion of circulating fluidized bed boilers and the addition of a large amount of limestone for furnace desulfurization, the boiler fly ash is very The fine and ash specific resistance increases, which directly leads to the reduction of the dust removal efficiency of the electrostatic precipitator. The use of cloth bag dust removal is ideal. From this perspective, the bag dust removal plus circulating fluidized bed boiler is an ideal combination for coal-fired desulfurization and dust removal, and has a very broad application prospect. At present, the Xuzhou Yancheng Power Plant 2x135MW Circulating Fluidized Bed Technical Renovation Project adopts this model of bag filter and circulating fluidized bed boiler for dust removal and desulfurization. It is still in the process of implementation. A single 440t / h The filter area of the bag filter equipped with the circulating fluidized bed boiler is 16500m2.
The core component of the bag filter-filter bag For the boiler bag filter, the filter bag is its core component, and its cost accounts for about 1/3 of the total cost of the bag filter. According to the previous analysis, in the past two decades, only the bag dust removal of thermal power plants has a market share of nearly 300 million yuan, and the dust filter bags have a market share of nearly 100 million yuan each year, and will have nearly 1 billion yuan in the past ten years. Market share.
The quality of the filter bag directly affects the dust removal efficiency of the dust collector, and the life of the filter bag directly affects the operating cost of the dust collector. According to the operating environment of the boiler tail dust collector (high flue gas temperature) and the condition of the medium (corrosion), it is better to use BWF high-quality Ryden needle felt: PPS / PPS504CS17, polyphenylene sulfide, waterproof and oil-proof treatment, temperature resistance up to 190 ℃, This filter material is a surface filter type filter material, which removes dust thoroughly and reduces the possibility of dust dusting after forming a cloth powder layer on the surface of the filter bag; the filter material has a long life and the improvement in the structure of the dust collector ensures that the filter material is 30,000 Hours of normal service life.