【摘要】 蒸汽暖风器是锅炉防止空气预热器腐蚀、堵灰的有效手段,但使用蒸汽暖风器会造成锅炉排烟温度升高而使全厂效率下降。该文针对一种新型前置式液相介质空气预热器,根据节能定量分析理论及等效焓降方法,进行了经济性分析,指出在不需要暖风时段,其经济性将变差的缺陷。提出一种优化的热力系统,结合某320 MW机组,进行了应用后的经济性分析,结果表明,此优化系统在不需要暖风时段全厂效率提高百分比由0.11%增至0.51%,全年平均供电标煤耗降低值由0.54 g/(kW.h)提高至1.50 g/(kW.h),经济性显著提高,能确保受热面的高效、安全、连续运行。更多还原

【Abstract】 Steam air heater is one of the most effective means to avoid air preheater corrosion and ash deposition,but it raises the boiler exhaust gas temperature and reduces the plant efficiency.Using the theory of energy conservation quantitative analysis and equivalent enthalpy method,the economic performance was discussed to a new type front-located air preheater with liquid mediator(FAPLM).The results indicate that in the period having no use for warming air,the economic performance of FAPLM become worse.Furthermore,the thermodynamic system was optimized.Basing on the parameters of a 320 MW unit thermodynamic system,the optimization economic analysis was accomplished.The results show that using optimized system,the increment ratio of the plant efficiency increases from 0.11% to 0.51% as not using for warming air,and the decrease value of annual average standard coal consumption rate of power supply increases from 0.54 g/(kW·h) to 1.50 g/(kW·h).The optimization economic performance is markedly enhanced,and the operation safety and continuity are assured.更多还原