宽负荷SCR脱硝系统的全负荷拓展技术探索

为了实现选择性催化还原(SCR)脱硝系统全负荷运行,减少环境污染,机组启动过程中使用宽负荷SCR脱硝系统进行全负荷脱硝系统试验:通过锅水循环泵(简称锅水泵)流量调节阀和锅水泵出水调节阀控制省煤器再循环流量,同时通过省煤器水旁路调节阀控制省煤器旁路流量,在保证设备、系统安全的前提下,减少了启动过程中省煤器的吸热量,提高了SCR脱硝反应器入口烟温,使得并网前SCR脱硝反应器入口烟温达到脱硝催化剂最低温度要求,从而投入SCR脱硝系统运行。

Full-load Expansion Technology for a Wide-load SCR Denitrification System

To realize full-load operation of a selective catalytic reduction(SCR)denitrification system for environmental protection purposes,full-load operation tests were conducted with a wide-load SCR denitrification system in start-up process of the unit,during which,the recirculation flow rate of economizer was controlled by the flow control valve and outlet control valve of the boiler circulating pump,while the bypass flow of economizer was controlled by the water bypass valve.On the premise of ensuring the safety of the equipment and system,the heat absorption of economizer was reduced during startup,and the flue gas temperature at the inlet of SCR denitrification reactor was increased,thus making the inlet flue gas temperature of SCR denitrification reator before grid connection meet the lowest temperature requirement of denitrification catalyst,so that the SCR denitrification system could be put into operation.