300 MW机组锅炉捞渣机改造及对锅炉经济性影响的研究  

Study on Transformation of 300MW Boiler Slag Conveyor and its Impact on Boiler Economy

作　　者：陈辉 周晓韡 张强 CHEN Hui;ZHOU XIAO-wei;ZHANG Qiang(National Energy Group Science and Technology Research Institute Co.,Ltd.;National Energy Group Taizhou Power Generation Co.,Ltd.)

机构地区：[1]国家能源集团科学技术研究院有限公司 [2]国家能源集团泰州发电有限公司

出　　处：《电站系统工程》2024年第4期25-28,32,共5页Power System Engineering

基　　金：国家能源集团2022年科技专项(GJNY-22-89)资助。

摘　　要：国内燃煤发电机组配置湿渣系统的锅炉普遍存在诸多问题。以某300 MW机组锅炉为对象,研究湿渣系统改造为干渣系统的技术方案和改造后对锅炉运行参数的影响。改造后不同负荷下排烟温度略有增加,过热减温水量增加0.2~0.6 t/h,再热减温水量增加0.3~0.5 t/h,干渣机改造后不存在火焰中心明显升高的现象。改造后飞灰变化不明显,锅炉效率较改造前略有降低。不同负荷下省煤器出口NO_(x)浓度增加22.4~31.3 mg/Nm^(3),脱硝系统喷氨量增加7.5~8.2 kg/h,干渣机系统的冷却风对NO_(x)的抑制生成不利。综合来看,湿渣系统改造为干渣系统后对锅炉运行参数影响不大,但是干渣系统无水耗和废水排放,综合经济性较好。There are many problems in the boiler of domestic coal-fired generating units.Take a 300MW unit boiler as the object,the technical scheme of wet slag system transformation into dry slag system and the influence on the boiler operation parameters after the transformation scheme is studied.After the transformation,the smoke exhaust temperature under different loads increased slightly,the overheating and heating water increased by 0.2-0.6t/h,and the reheating water increased by 0.3-0.5th.There was no obvious increase in the flame center of the dry slag machine.After the transformation,the change of fly ash is not obvious,and the efficiency of the boiler is slightly reduced compared with before the transformation.The concentration of NO_(x)at the outlet of economizer increases by 22.4-31.3mg/Nm^(3)under different loads,the ammonia injection amount of the denitration system increases by 7.5-8.2kg/h,and the cooling air of the dry slag machine system is unfavorable to the inhibition of NO_(x).In general,the transformation of the wet slag system into the dry slag system has little impact on the boiler operation parameters,but the dry slag system has no water consumption and wastewater discharge,and the comprehensive economy is good.

关 键 词：燃煤锅炉 捞渣机 锅炉经济性 NO_(x)浓度 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]