【摘要】 利用烟气温湿图对回收原理进行解释,提供了计算回收量和评价系统性能的方法,结合某300 MW燃煤机组计算了烟气余热和水回收量,优化了系统性能,并对技术经济性进行了分析。结果表明:对于300 MW燃煤机组,当烟气温度由50℃降低至30℃时,可回收净化水的质量流量为81.4t/h,用于脱硫系统补水基本实现"零水耗";可回收热量为65.2 MW,经蒸汽压缩机提质后可输出热量为67.6MW,系统性能系数为21.5;在增加投资8 650万元的基础上,扣除烟气再热所需热量后,用于集中供热的静态回收期为3.87a,年增加净收益达1 223.1万元,具有良好的节能、节水与经济效益。更多还原

【Abstract】 A flue gas waste heat and water recovery system was proposed based on mechanical vapor recompression(MVR),of which,the recovery mechanism was analyzed using flue gas temperature-humidity chart,while the methods to calculate the recovered heat/water and to evaluate the system performance were provided.Taking a 300 MW coal-fired unit as an example,the recovered heat and water were computed,the system performance was optimized,and the technical economy of the unit was analyzed.Results show that for a 300 MW coal-fired unit,about 81.4 t/h of water could be recovered in the case that the flue gas temperature drops from 50℃to 30℃,when zero water consumption could be realized theoretically for the FGD process.The waste heat that could be recovered is 65.2 MW,which turns out to be 67.6 MW of power output after mechanical vapor recompression,when the system performance factor is 21.5.Regarding economic performance,the additional investment for the system proposed is approximately86.50 million RMB;considering the heat for flue gas reheating,the static payback period is 3.87 years,with a net income of 12.231 million RMB per year,indicating significant effects of the system in energy saving,water saving and economic benefits.更多还原