基于调峰场景下的亚临界切圆燃烧锅炉灵活性挖掘  

Flexibility Mining of Subcritical Tangential Combustion Boilers based on Peak Shaving Scenarios

作　　者：王明亮 王赫 赵斌 陈晓龙 潘博 WANG Mingliang;WANG He;ZHAO Bin;CHEN Xiaolong;PAN Bo(Dalian Development Area Co-Generation Power Plant of Beijing GD Power Co.,Ltd.,Dalian 116600,Liaoning,China;China Energy Science and Technology Research Institute Co.,Ltd.,Shenyang Branch,Shenyang 110100,China;School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]北京国电电力有限公司大连开发区热电厂,辽宁大连116600 [2]国家能源集团科学技术研究院有限公司沈阳分公司,沈阳110100 [3]长沙理工大学能源与动力学院,长沙410114

出　　处：《能源研究与管理》2024年第3期85-90,共6页Energy Research and Management

基　　金：国家能源集团科技项目“煤电机组状态评价与寿命管理政策研究”(GJNY-19-94)。

摘　　要：为了提高燃煤发电机组锅炉低负荷稳燃、宽负荷脱硝、快速变负荷速率、快速启停和调峰辅助服务等能力,挖掘亚临界切圆燃烧锅炉灵活性潜力,以某电厂600 MW亚临界燃煤机组为例,采用直流燃烧器垂直浓淡改造技术、磨煤机动态分离器技术和省煤器旁路烟道技术对锅炉进行综合改造。通过锅炉性能试验,比较分析了改造前后锅炉的主要性能指标。试验结果表明:改造后机组最低稳定燃烧负荷由额定负荷的40%下降到30%;改造后,最低稳定燃烧负荷下脱硝系统入口NO_(x)平均质量浓度为239.73 mg/Nm^(3),比改造前低168.53 mg/Nm^(3);经过动态分离器改造的磨煤机煤粉细度R_(90)可实现25%~38%的调节范围,煤粉细度R_(200)可实现2%~5%的调节范围;改造后,30%额定负荷脱硝系统入口烟气温度高于300℃。600 MW亚临界机组灵活性改造的成功案例,可为火电机组柔性化转型提供借鉴和启示。In order to improve the low load stable combustion,wide load denitrification,fast load change rate,fast start stop,and peak shaving auxiliary services of coal-fired power generation unit boilers,and to tap into the flexibility potential of subcritical tangential combustion boilers,a 600 MW subcritical coal-fired unit in a power plant was taken as an example.The boiler was comprehensively renovated using DC burner vertical rich lean transformation technology,coal mill dynamic separator technology,and economizer bypass flue technology.Through boiler performance tests,the main performance indicators of the boiler before and after the renovation were compared and analyzed.The experimental results show that the minimum stable combustion load of the modified unit has decreased from 40%of the rated load to 30%.After the renovation,the average mass concentration of NO_(x) at the inlet of the denitrification system under the minimum stable combustion load is 239.73 mg/Nm^(3), which is 168.53 mg/Nm^(3) lower than before the renovation. The coal powder fineness R90 of the coal mill modified by the dynamic separator can achieve an adjustment range of 25% to 38%, and the coal powder fineness R200 can achieve an adjustment range of 2% to 5%. After the renovation, the inlet flue gas temperature of the 30% rated load denitrification system is higher than 300 ℃. The successful case of flexibility transformation of 600 MW subcritical units can provide reference and inspiration for the flexible transformation of thermal power units.

关 键 词：亚临界机组 灵活性改造 直流燃烧器 最低稳燃负荷 NO_(x)平均质量浓度 

分 类 号：TK223.2[动力工程及工程热物理—动力机械及工程]