王曲电厂600MW超临界机组锅炉脱硝系统宽负荷运行方案研究
发布时间：2018-07-13 18:26
【摘要】：我国火电厂氮氧化物排放量随装机总量增大而逐年增多,为防止锅炉内燃煤燃烧后产生过多的氮氧化物(即NOX)污染环境,王曲电厂对两台锅炉机组进行了脱硝系统改造并投运。其锅炉烟气脱硝系统采用选择性催化还原法(SCR),为满足SCR催化还原反应温度窗口,在SCR反应器的设计过程中一般要求入口烟气温度为320℃以上。但实际运行过程中,由于机组负荷受电网调度控制,通常处于变工况运行条件下,锅炉运行在50%负荷以下时,SCR入口烟温就会低于320℃,使得SCR脱硝系统无法正常运行,造成锅炉烟气排放的NOx浓度无法满足达标排放要求。为保证锅炉宽负荷运行条件下SCR脱硝系统正常运行,解决达标排放问题,本文以王曲电厂600MW超临界机组锅炉为研究对象,提出了关于此电厂的五种锅炉及热力系统的改造方案,即:省煤器烟气旁路、省煤器分级布置、省煤器设置给水调节旁路、增设零号高加、省煤器加装再循环泵。根据王曲电厂的实际情况,研究并制定了适合此电厂的锅炉机组改造的最佳可行性技术方案。通过锅炉省煤器热力计算,对改造方案实施后的机组运行参数进行了计算与分析。分析结果表明:改造后可以拓宽SCR系统的变负荷运行范围,实现机组在最低35%负荷以上,通过运行调整可以满足SCR系统投运条件,以满足我国日益严格的锅炉烟气NOX排放要求。
[Abstract]:The amount of nitrogen oxide emission in thermal power plants in China increases year by year with the increase of the total installed capacity. In order to prevent excessive nitrogen oxides (NOX) pollution caused by burning coal in boilers, Wangqu Power Plant has reformed and put into operation the denitrification system of two boiler units. The boiler flue gas denitrification system adopts selective catalytic reduction (SCR) method. In order to meet the temperature window of SCR catalytic reduction reaction, the inlet flue gas temperature is generally required to be above 320 鈩，
本文编号：2120346
[Abstract]:The amount of nitrogen oxide emission in thermal power plants in China increases year by year with the increase of the total installed capacity. In order to prevent excessive nitrogen oxides (NOX) pollution caused by burning coal in boilers, Wangqu Power Plant has reformed and put into operation the denitrification system of two boiler units. The boiler flue gas denitrification system adopts selective catalytic reduction (SCR) method. In order to meet the temperature window of SCR catalytic reduction reaction, the inlet flue gas temperature is generally required to be above 320 鈩，
本文编号：2120346
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