300MW电站煤粉锅炉大比例掺烧半焦的试验研究  

Experimental research on large proportion co-firing of semi-coke in a 300 MW pulverized coal boiler

作　　者：杨剑锋 杜进 黄璞 黎海平 陈一平 申明 王志超[5] 刘豪[4] YANG Jianfeng;DU Jin;HUANG Pu;LI Haiping;CHEN Yiping;SHEN Ming;WANG Zhichao;LIU Hao(Hunan Province Key Laboratory of Efficient&Clean Thermal Power Generation Technologies(State Grid Hunan Electric Power Co.,Ltd.Electric Power Research Institute),Changsha 410007,China;Hunan Xiangdian Test&Research Institute Co.,Ltd.,Changsha 410004,China;Chang’an Shimen Power Generation Co.,Ltd.,Changde 415300,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]高效清洁火力发电技术湖南省重点实验室(国网湖南省电力有限公司电力科学研究院),湖南长沙410007 [2]湖南省湘电试验研究院有限公司,湖南长沙410004 [3]长安石门发电有限公司,湖南常德415300 [4]华中科技大学煤燃烧国家重点实验室,湖北武汉430074 [5]西安热工研究院有限公司,陕西西安710054

出　　处：《热力发电》2020年第7期69-76,共8页Thermal Power Generation

基　　金：国家重点研发计划项目(2017FYB0602004);国家自然科学基金项目(51876074)。

摘　　要：为推动煤热解产物半焦在电站锅炉上的安全高效利用,在某300 MW机组煤粉锅炉上开展了大比例掺烧半焦的现场试验,对不同半焦掺烧比例下的锅炉性能及NOx排放特性进行了比较分析。结果表明:半焦具有良好的着火性能,掺烧后能够改善原煤质的燃烧特性;采用“分磨制粉、分仓储存、炉内分层掺混”的掺烧方式可以实现半焦掺烧比例50%下锅炉的安全稳定运行;在300 MW负荷下,与掺烧前相比,半焦掺烧比例为50%时,锅炉效率从90.36%升高至92.79%,炉堂出口NOx排放质量浓度从493.85 mg/m3降低至435.86 mg/m^3。煤粉锅炉大比例掺烧半焦可提高锅炉效率,降低NOx排放质量浓度,但是炉膛出口温度稍有增加,减温水量增大。In order to comprehensively utilize the semi-coke resources generated by coal pyrolysis,field test about large proportion co-firing of semi-coke was carried out on a 300 MW pulverized coal boiler,and the boiler performance as well as the NOx emission characteristics were investigated under different conditions.The results show that,the semi-coke had good ignition performance and could improve the combustion characteristics of the raw coal.By adopting the blending method of“grinded by different mills,separated storage and stratified mixing in the furnace”,the boiler with semi-coke’s co-firing proportion of 50%could realize safe and stable operation.At 300 MW,when the blending proportion of semi-coke reached 50%,the boiler efficiency increased from 90.36%(before co-firing)to 92.79%,and the NOx emission mass concentration decreased from 493.85 mg/m^3(before cofiring)to 435.86 mg/m3.Co-firing large proportion of semi-coke can enhance the pulverized coal boiler’s efficiency and reduce the NOx emission mass concentration,but increase the temperature at the furnace outlet slightly as well as the amount of cooling water.

关 键 词：半焦 掺烧 大比例 锅炉效率 NOX排放 运行优化 煤粉锅炉 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]