【摘要】 某电厂300 MW机组设计的低低温省煤器联合暖风器系统,将锅炉烟气余热回收用于加热汽轮机凝结水和锅炉侧冷风,实现机炉联合余热利用。系统投运后,可同时提高锅炉热效率和机组循环热效率,综合发电煤耗降低3.02g/(k W·h);同时,系统还可减轻空气预热器冷端低温腐蚀和堵灰,控制空气预热器烟气侧压降,提高电除尘器效率。最后,针对系统运行存在的问题提出了应对措施。更多还原

【Abstract】 For a certain 300 MW power unit,the designed system of low temperature economizer with steam-air heater could realize the combining waste heat utilization of turbine and boiler,which recover waste heat of flue gas to heat condensation water of steam turbine and cold air at boiler side. After the system put into operation,the boiler thermal efficiency and the circulating heat efficiency are both improved at the meantime,and the full load power generation coal consumption is reduced to 3. 02 g /( kW ·h). Besides,the system also could reduce the lowtemperature corrosion at the cold side and ash blocking of air preheater,control the pressure drop at flue gas side of air preheater,and improve the electrostatic precipitator efficiency. At the end of this paper,the countermeasures for existing problems in the system operation are proposed.更多还原