【关键词】 SNCR; CRF; 摩尔比; 温度; 漏失氨;

【英文关键词】 SNCR; CRF; molar feed ratio; temperature; ammonia slip;

【中文摘要】 选择性非催化还原法(Selective Non-Catalytic Reduction,简称SNCR)是目前发达国家普遍采用的烟气脱硝方法,是一种建设周期短、投资少、脱硝效率中等的烟气脱硝技术,它比较适合于对中小型电厂锅炉的改造,适合我国国情。 本文首先对NOx的生成和控制原理进行了理论探讨,对目前流行的脱氮技术进行了详细介绍。在CRF(Combustion Research Facility)实验台上进行了不同条件下各种工况的实验,分析了一些影响SNCR烟气脱硝效率的因素,SNCR烟气脱硝效率的影响因素主要有:反应温度、NH3/NO摩尔比、还原剂等。实验研究结果分析得到结论为:反应温度和NH3/NO摩尔比对脱硝效率的影响较大,脱硝效率随着NH3/NO摩尔比的增加而增加;尿素溶液的最佳喷入温度为850℃-950℃;合理的NH3/NO比例在1.0-2.0之间;尿素溶液的最佳质量浓度为10%左右;尿素溶液和氨水溶液两种不同的还原剂进行比较,得到尿素溶液的还原效果更好,而且更容易运输和使用。实验还对氨气的漏失量进行了测量,从曲线中可以看出随着NH3/NO摩尔比的变大,氨气漏失量也增大。在NH3/N...

【英文摘要】 Studying on dry NOx removal by SNCR (Selective Non-Catalytic Reduction) was carried out in this thesis, which is adopted by the developed countries at large now. It is a mature technology for moderate NOx emission control on fluegas. Its investment and operating cost are lower than other flue gas de-NOx techno-logies, and the installation is easy relative to other NOx emission control technologies. So SNCR is suited for retrofitting the smaller utility boiler,and suited to China's national situation. ...