原位式氨逃逸在氨法脱硝中的应用

Application of In-Situ Ammonia Escape in Ammonia Denitrification

发电厂或自备电厂锅炉燃烧后产生大量的NO_X严重污染环境,企业通过氨法脱硝将大部分NO_X脱除,效率可达到95%以上。但由于脱硝过程中NH_3/NO_X摩尔比、NH_3和NO_X分布不均匀性、负荷、温度、催化剂性能等因素影响都会导致氨逃逸率较大。逃逸的氨气与烟气中SO_3反应生成NH_4HSO_4,该物质具有很强的粘性和腐蚀性,不仅会影响催化剂活性,而且会引起空气预热器腐蚀和堵塞,甚至引起装置大面积停车,为此如何准确、高效地测量氨逃逸成为氨法脱硝的瓶颈问题。

A great deal of NOX pollution is produced after combustion of boiler in power plant or self-owned power plant.Most of NOX is removed by ammonia denitrification,and the efficiency can reach more than 95%.However,NH3/NOX molar ratio,ammonia and nitrogen oxide distribution inhomogeneity,load,temperature,catalyst performance and other factors will lead to higher ammonia escape rate.The escaping ammonia reacts with SO3 in flue gas to produce NH4HSO4,which is very viscous and corrosive,which will not only affect the activity of the catalyst,but also cause corrosion and blockage of air preheater,and even cause the device to stop in a large area.Efficient measurement of ammonia escape becomes the bottleneck of ammonia denitrification.