1000MW机组烟-风-水一体化深度烟气余热利用系统  

The Flue gas-air-water Integration Waste Heat Utilization System in a a 1000MW Unit

作　　者：宋景明 唐鹏 陈宝 SONG Jingming TANG Peng CHEN Bao(State Nuclear Electric Power Planning Design and Research Institute Co., Ltd., Beingjing 100095, China)

机构地区：[1]国核电力规划设计研究院有限公司,北京100095

出　　处：《锅炉技术》2017年第5期29-34,共6页Boiler Technology

摘　　要：对某1000MW机组烟气余热利用系统进行了分析论证,推荐采用烟-风-水一体化深度余热利用方案。烟-风-水一体化余热利用方案:在电除尘器及脱硫塔入口各设置一级换热器,闭式热媒水在其中被烟气加热后,进入送风机出口的水媒暖风器,加热空气预热器入口冷二次风,空气预热器入口冷风温度提高后,置换出来的烟气通过空气预热器旁路烟道排放,旁路烟道内设置高、低压换热器,分别加热高压给水和凝结水。采用此系统后,可降低发电煤耗约3.15g/(kW·h),脱硫用水每台机组降低约53t/h。In this paper, flue gas heat recovery system of a 1 000 MW unit was analyzed and demonstrated. The flue gas-air-water integration waste heat utilization system was recommended. The flue gas-air-water integration waste heat utilization system： A heat exchanger is set in the electrostatic precipitator and desulfurization tower entrance. After be heated by flue gas in the heat exchanger, closed heat medium water is fed into the water heater at the outlet of forced draught blower to heat cold secondary air at the air preheater inlet. As temperature of secondary air increasing, the replaced flue gas is discharged through the air pre-heater bypass flue in which high and low pressure heat exchangers are set to heat high pressure feed water and condensed water. Through the system, the coal consumption can be reduced by about 3.15 g/（kW, h）, and the desulfurization water consumption per unit can be reduced by about 53 t/h.

关 键 词：烟气余热 烟气换热器 空气预热器旁路烟道 高、低压换热器 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]