低负荷下四角切圆锅炉NO_(x)优化控制  

NO_(x)Optimal Control of Tangentially-fired Boiler Under Low Load

作　　者：童家麟 邹玉凤 郑建平 茅建波 叶学民[2] TONG Jialin;ZOU Yufeng;ZHENG Jianping;MAO Jianbo;YE Xuemin(Hangzhou E-Energy Technology Co.,Ltd.,Hangzhou,Zhejiang 310014,China;Department of Power Engineering,North China Electric Power University,Baoding,Hebei 071003,China)

机构地区：[1]杭州意能电力技术有限公司,浙江杭州310014 [2]华北电力大学动力工程系,河北保定071003

出　　处：《广东电力》2023年第10期137-147,共11页Guangdong Electric Power

基　　金：杭州意能电力技术有限公司科技项目(EERD2022-12)。

摘　　要：为解决燃煤机组在深度调峰下NO_(x)排放过高的问题,针对某600 MW四角切圆燃煤锅炉的燃烧特性开展数值模拟,分析在30%额定负荷下,燃尽风量、配煤配风方式和燃尽风来源对炉内温度场、组分场和燃尽率的影响。结果表明:30%额定负荷下,增加燃尽风量可有效减少NO_(x)的生成,与原工况相比,工况3的NO_(x)减排率达到11.9%;主燃区采用正塔配煤、倒塔配风方式时,虽然炉膛出口温度稍有下降,但工况9的NO_(x)减排率可达14.2%;高速射流燃尽风能够穿透主烟气气流参与燃烧,可使工况16的NO_(x)减排率高达17.8%。低负荷下,采用热一次风代替燃尽风并优化燃烧的方式可有效控制NO_(x)排放。To solve the excessive NO_(x) emission of coal-fired units under deep peak regulation,this study numerically simulates the combustion characteristics of a 600 MW tangentially-fired boiler and investigates the effects of burnout air flowrate,redistributing coal-air mode and the burnout air source on temperature field,component field and burnout rate in furnace under 30%rated load.The results show that adding burnout air effectively reduces the generation of NO_(x),compared with the baseline,the NO_(x) emission reduction rate of case 3 reaches 11.9%.When the main combustion zone adopts the positive tower coal blending and inverted tower air distribution mode,although the furnace outlet temperature decreases slightly,the NO_(x) emission reduction rate of case 9 reaches 14.2%.The high-speed burnout air can penetrate the main flue gas to enhance combustion and the NO_(x) emission rate of case 16 is as high as 17.8%.At low loads,combination of hot primary air replacing burnout air and optimizing combustion mode can effectively control NO_(x) emissions.

关 键 词：四角切圆锅炉 燃尽风 配煤配风方式 燃烧特性 

分 类 号：TM621.2[电气工程—电力系统及自动化] TK227.1[动力工程及工程热物理—动力机械及工程]