【摘要】 对空气预热器的漏风、阻力和排烟温度对锅炉风机电耗、发电煤耗的影响做了详细的理论分析,并根据选择300MW、600MW和1 000MW机组的具体参数进行了计算。计算表明,降低1个百分点的漏风率只能降低发电煤耗0.065g/kW·h~0.071g/kW·h,排烟温度上升1℃相当于漏风率上升2.5%~3%或烟气阻力升高250Pa~300Pa的影响的结论,对空气预热器设计、运行中,对提高锅炉经济性的空气预热器性能优化次序做了分析,并指出,在新设计的空气预热器中,关注的主导方向应是提高换热效率,采用真正有经济价值的漏风控制手段而不是只追求漏风率的数值大小,重视控制空气预热器运行阻力和控制漏风率同等重要。更多还原

【Abstract】 An detail analysis about the relationship between boiler’s economic performance and air preheater’s main performance parameters was done.Some tipical data from 300MW, 600MW and 1 000MW unit’s air preheater were used in calculating the economic perform- ance values.According the calculation,1percent leakage ratio decreasing can save the coal consumption about 0.065~0.071g/kW·h,The calculating results show that 1deg.C gas out temperature increasing can have the equivalent effect to unit’s economic performance as 2.5~3percents air leakage increasing or 250~300Pa gas side pressure drop increasing.The air heater performance improving order was discussed and supplied in this article.In the new air heater design work,the first point need concern is try to enhance the heat exchanging effi- cience,use the leakage controlling methods with reasonable economic technologies and no on- ly seek for a small leakage value.During operation,controlling the air and gas pressure drop are same important as controlling leakage value.更多还原