选择性非催化脱硝不同还原剂的比较试验研究

A Contrast and Experimental Study of Various Reduction Agents for Selective Non-catalytic Denitration Process

SNCR（选择性非催化还原）过程试验是在CRF（Cornbustion Research Facility）试验装置上进行的。使用尿素、氨水、（NH4）2CO3、NH4HCO3还原烟气中的NOx，通过雾化喷嘴在CRF炉膛内喷入还原剂。试验结果表明，对于所使用的还原剂随着NH3／NO摩尔比的增加，NO还原效率逐渐提高；对于尿素、氨水、（NH4）2CO3等还原剂，氨氮比为1-2.5，脱硝效率分别为65％-89％、62％-86％、45％-84％；对于NH4HCO3，氨氮摩尔比0.8-1.5，脱硝效率为46％-73％。不同还原剂的温度窗口不同，适宜尿素进行SNCR过程的反应温度最高，氨水最低。

An experiment of selective non-catalytic reduction (SNCR) process was performed on a CRF (Combustion Research Facility) test rig. Carbamide,ammonia water,(NH4)2CO3 and NH4HCO3 were used to reduce NOx in flue gas and a reduction agent was sprayed into the CRF furnace through an atomization nozzle. The test results show that for the reduction agents used,with an increase of NH3/NO molar ratio,the NO reduction efficiency will gradually increase. As for the reduction agents ,such as carbamide,ammonia water and (NH4)2CO3,NH4HCO3 etc.,which have an ammonia/nitrogen molar ratio of 1 to 2.5,the denitration efficiencies will be 65%-89%,62%-86% and 45%-84% respectively. As regards NH4HCO3 which has an ammonia/nitrogen molar ratio of 0.8 to 1.5,the denitration efficiency will be 46%-73%. The temperature windows of various reduction agents are different. The reaction temperature suitable for conducting the SNCR process is the highest for carbamide and the lowest for ammonia water.