提高催化剂反应效率的烟温协调优化控制  

Coordinated Optimization Control of Flue Gas Temperature for Improving Reaction Efficiency of Catalyst

作　　者：杨建国[1] 樊立安[1] 赵虹[1] 牟文彪 李晓晖[3] 余海铭 李敏 

机构地区：[1]能源清洁利用国家重点实验室(浙江大学),浙江省杭州市310027 [2]浙江省能源集团有限公司,浙江省杭州市310007 [3]台州发电厂,浙江省台州市318016 [4]浙江浙能兰溪发电有限责任公司,浙江省兰溪市321100

出　　处：《中国电机工程学报》2014年第14期2244-2250,共7页Proceedings of the CSEE

摘　　要：为了降低氨逃逸率和缓解空预器堵灰问题,选取某300 MW机组为研究对象,设计研究了4种不同的烟温控制方案和选择性催化还原(SCR)省煤器。锅炉热力计算结果表明,高温烟气旁路与SCR省煤器联合布置,旁路烟气份额最大20%,SCR省煤器的面积为原省煤器面积的40%,在最低烟温工况下,SCR入口烟温可调节达到接近340℃;在最高烟温工况下,SCR入口烟温不需调节,排烟温度可降低6.1℃。基本能够完全实现全运行工况下SCR入口烟温在340℃以上的催化剂高效运行需求,排烟温度在更小更优化的范围内变化。假设全年平均负荷为75%,则近似平均排烟温度下降5.2℃,发电煤耗降低接近1 g/(kW?h)。Different control programs of flue gas temperature and selective catalytic reduction （SCR） economizer were designed and studied to reduce ammonia slip rate and relieve air preheater fouling problem. A 300MW unit was selected for the study. The boiler thermal calculation results indicate that through the joint arrangements between the high temperature flue gas bypass and SCR economizer, the SCR inlet flue gas temperature could be regulated to nearly 340 ℃ under the lowest flue gas temperature condition with maximum 20% bypass flue gas ratio and 40% the original economizer area of SCR economizer. While, under the highest flue gas temperature condition, the SCR inlet flue gas temperature would not be regulated, and the exhaust gas temperature could be decreased 6.1 ℃. In this way, the highly efficient operation of catalyst at 340 ℃ or more of SCR inlet flue gas temperature and variation of exhaust gas temperature in much smaller and more optimal range are ahnost completely achieved under all operating conditions. If the annual average load was 75%, the average exhaust gas temperature would approximately be dropped 5.2 ℃ and the standard coal consumption decreased was nearly 1 g/（kW.h）.

关 键 词：催化剂 反应效率 选择性催化还原 氨逃逸率 省煤器 烟温 协调优化控制 

分 类 号：X511[环境科学与工程—环境工程]