褐煤烟气预干燥发电系统的节能潜力分析--煤种和机组冷端形式的影响

摘要

为考查褐煤烟气预干燥发电系统的节能适应性，采用理论分析方法，对燃用伊敏、大雁、五间房、白音化4种褐煤的1000 MW空冷、湿冷机组的节能潜力进行定量分析，获得了不同褐煤烟气预干燥发电系统形式下发电标准煤耗率降低量的定量结论。计算结果表明：褐煤的水分含量越高，系统的节能潜力越大；在不回收乏气热能或仅回收乏气热能预热锅炉送风时，空冷机组节能潜力略大于湿冷机组；湿冷机组用冷凝水进一步回收乏气热能，其节能潜力超过空冷机组。%To investigate the energy saving adaptation of boiler flue gas pre-dried lignite-fired power system,the energy saving po-tential of 1 000 MW air-cooling and wet-cooling power system units burning different kinds of lignite from Yimin,Dayan,Wu-j ianfang and Baiyinhua were quantitatively analyzed using theoretical analysis method.And the quantitative conclusion of the a-mount of standard coal consumption reduction rate at different flue gas pre-dried lignite-fired power generation system form.Re-sults show that,the higher of water content of lignite,the greater the energy-saving potential of system.Without recoverying of exhaust gas heat recovery of exhaust gas heat,or only recoverying of exhaust gas heat boiler air preheating,energy saving poten-tial of air-cooling unit is slightly larger than the wet-cooling unit.When the condensed water was used in the wet-cooling unit for further recovery of exhaust gas heat energy,its energy saving potential was higher than air-cooling unit.