褐煤纯烧致灰库自燃的分析与防治  

Analysis and Prevention of Self-combustion in Ash Silo Caused by Pure Lignite Burning

作　　者：章鹏 丁海雷 吴跃森 韩平 ZHANG Peng;DING Hailei;WU Yuesen;HAN Ping(E.Energy Technology Co.,Ltd.,Hangzhou 310012,China)

机构地区：[1]杭州意能电力技术有限公司,杭州310012

出　　处：《浙江电力》2022年第4期96-102,共7页Zhejiang Electric Power

摘　　要：近年来国内动力煤价格高企,出于成本考虑,火电厂普遍掺烧褐煤。另外,为消纳新能源电力,火电机组深度调峰频次大增。在机组启动及调峰低负荷运行期间,炉膛火焰温度低,煤粉燃烧不充分。未燃尽的煤灰经输灰系统至灰库储存,存在极大自燃风险。对某超超临界机组启动期间褐煤纯烧发生的灰库自燃进行分析,采用热水暖炉启动、分层储灰以及对灰库料位进行合理控制等措施,可减少54%的低负荷运行时间,避免未燃尽煤灰的集中堆积,兼顾增加气化风均匀性和减少储灰蓄热,保障了机组安全、稳定运行,同时也为燃用褐煤机组的灰库自燃防治提供借鉴。In recent years,the price of domestic thermal coal has been high.For cost consideration,thermal power plants generally burn lignite now.In addition,the frequency of deep peak shaving of thermal power units has increased significantly to consume new energy power.During the unit start-up and low-load operation,because of the low furnace flame temperature,the combustion of pulverized coal is not sufficient,causing a great risk of spontaneous combustion after being transported to the ash silo through the ash handling system.The paper analyzes the spontaneous combustion of ash silo during the commissioning of start-up for an ultra-supercritical unit that adopts pure lignite.Measures such as hot water warming furnace start-up,stratified ash storage and reasonable control of ash storage level are taken,which can reduce low-load running time by 54%,prevent concentrated accumulation of unburned pulverized coal.In addition,by increasing the evenness of fluidization air and reducing heat storage of ash silo,operation stability and safety of the unit is guaranteed,which provides a reference for the prevention and control of self-combustion in ash silo of lignite-fired units.

关 键 词：褐煤纯烧 灰库自燃 低负荷运行 深度调峰 机组启动 燃煤机组 

分 类 号：TM621.2[电气工程—电力系统及自动化]