燃煤工业锅炉污染物协同治理关键技术

Key Technologies of Multi-pollutants Synergia Control in Coal-fired Industrial Boilers

我国燃煤工业锅炉数量众多,是大气污染物的主要来源之一。燃煤工业锅炉污染物排放标准日趋严格,现有的燃煤工业锅炉污染物治理路线已经难以达到要求,同时由于工业锅炉排烟温度过高导致了严重的能源浪费,由此提出了一种以烟气深度冷却器、低低温静电除尘器、脱硫脱硝除尘一体化塔为核心的"低NOx燃烧+烟气深度冷却器+低低温静电除尘器+脱硫脱硝除尘一体化塔"的燃煤工业锅炉污染物协同治理关键技术路线,在降低排烟损失的同时,可以实现烟尘、SO2、NOx、SO3、Hg及其化合物的高效协同脱除,最终可达到烟尘浓度为20mg/m3、SO2浓度为35 mg/m3、NOx浓度为50 mg/m3、Hg及其化合物浓度为0.05 mg/m3以下的超低排放。实践证明:该技术路线在技术经济可行性上适合我国燃煤工业锅炉领域节能和超低排放发展需求。

More and more coal-fired industrial boilers have caused serious air pollution. The existing pollutants control route can hardly reach the restrictive legislation established recently. Meanwhile, the high temperature of exhaust flue gas leads to much energy waste. A synergistic control technical route of multi-pollutants in coal-fired industrial boilers is pro- posed. The new route is composed of low NO~ combustion technology, flue gas deep cooling, low low temperature electro- static precipitation and multi-pollutant synergistic removal device. By this route, the exhaust flue gas loss is decreased, and the final concentrations of dust, SO2, NO~, SO3 and Hg in flue gas can reach 20 mg/m3, 35 mg/m3, 50 mg/m3, 0.05 mg/m3 respectively. Practice has proved that the synergistic control technical route can meet the demands of energy saving and emission reduction in coal-fired industrial boilers with thepromising feasibility of technology and economy.