串级前馈方法在SNCR烟气脱硝系统上的应用  

Application of Cascade Feedforward Method Used in the Flue Gas System of SNCR Denitration

作　　者：李昌海 冯慧山 田金海 王金河 

机构地区：[1]中国石油化工股份有限公司天津分公司,天津300270

出　　处：《自动化与仪表》2016年第2期47-49,53,共4页Automation & Instrumentation

摘　　要：选择性非催化还原(SNCR)是一种使用广泛的烟气脱硝技术,该文介绍了以尿素为原料的SNCR反应原理和现场工艺流程,对原变设定值的SNCR脱硝自动控制方案进行了分析,对焦煤掺烧、反应区温度、一二次风配比、氧量变化和石灰石投入量对SNCR脱硝反应的扰动,无法有效地控制。为此,提出了以氮氧化物为主调的串级前馈控制方法。实际运行检验表明,该算法简单、整定方便,在上述干扰的情况下,能够有效地控制NOx的排放量,对于CFB锅炉SNCR烟气脱硝自动控制的实现,具有一定的借鉴意义。Selective non catalytic reduction（SNCR）is a widely used for flue gas denitration technology,this paper is introduce using urea as raw material of SNCR reaction principle and process flow,analyzed the primary variable setpoint SNCR denitration automatic control scheme for coking coal blending and reaction temperature,ratio of one or two secondary air and oxygen concentration variation and limestone inputs the denitration reaction disturbance on the SNCR,the problem can not be effectively control. Therefore,proposed to nitrogen oxides as the cascade feedforward key control method,the actual running test show that the algorithm is simple,setting is convenient,in the case of in- terference,can effectively control the NOx emissions,implementation for SNCR boiler flue gas CFB denitration automatic control,has a certain significance.

关 键 词：串级 循环流化床 NOx 选择性非催化还原 控制 

分 类 号：TK323[动力工程及工程热物理—热能工程]