循环流化床锅炉超低排放技术研究

循环流化床（CFB）锅炉能够比较清洁地燃烧各种固体燃料,但其如何适应新的国家环保标准,实现SO₂及NO_x污染物的超低排放,需作进一步研究。结合CFB锅炉工程实例,根据煤折算硫分的高低和挥发分高低,分别提出了CFB锅炉深度脱硫及脱硝的技术方案,并对关键技术进行了分析讨论。研究结果表明：针对不同煤种采取相应措施后,CFB锅炉SO₂排放值可小于100 mg/m³,NO_x排放值可稳定在100 mg/m³以下;对于烟煤等高挥发分煤种,若结合SNCR技术, CFB锅炉NO_x排放值可达到小于50 mg/m³的超低排放水平。

Research on Ultra-Low Emission Technology for CFB Boilers

Circulating fluidized bed(CFB) boilers are capable of clean combustion for various solid fuels. However, further studies are still needed on how to make CFB boilers meet the new national environmental standards of ultra-low emission of SO₂ and NO_x. By taking example of the engineering projects of CFB boiler, certain deep desulfurization and denitration technology schemes are put forward according to the contents of equivalent sulfur and volatile matter in coal. The analysis and discussions on key technologies are also conducted. The research results show that by adopting the proper schemes corresponding to various coal types, the SO₂ emissions can be maintained below 100 mg/m³ while the NO_x emissions can be stabilized below 100 mg/m³ for CFB boilers. For the high-volatile bituminous coal, in cooperation with the SNCR technology, the NO_x emissions can reach the ultra-low emission level of less than 50 mg/m³ for CFB boilers.