中文摘要：

该文提出了基于预干燥、乏气回收的褐煤热电联产系统，以提高褐煤综合利用效率，同时回收干燥乏气水分。以1000MW褐煤发电系统为对象，建立了褐煤预干燥及乏气回收系统热经济性分析模型，进而对系统的节能、节水效益进行了定量分析。结果表明：采用汽轮机抽汽为热源，将褐煤中的水分由37．60％分别干燥至含水量为25％、20％、15％、10％、5％时，系统发电标准煤耗率相比直接燃烧可以分别降低6．49、7．89、9．08、10．15、11．10g／（kW．h1。如果采用干燥乏气热能对外供热，系统发电标准煤耗率可以进一步降低8．43、10．87、12．96、14．77、16．36g／（kW．h），同时可以回收93．1、121．3、146．0、167．7、187．Ot／h的水分。最后，以褐煤含水量干燥至15％时为例，给出了系统的初步布置方案，并进行了干燥乏气热网加热器的初步设计。

英文摘要：

A lignite-fired combined heat and power （CHP） based on lignite pre-drying and waste heat recovery was proposed in this paper to increase the lignite utilization efficiency and recover water from dryer exhaust. A 1000MW lignite-fired power plant was used as a reference case. Thermodynamic models were developed, with which the energy and water saving benefits were quantitatively analyzed. Results showed that if the moisture content in lignite is pre-dried to 25%, 20%, 15%, 10% and 5% from 37.60%, the standard coal consumption rate for power generation could be respectively decreased by 6.49, 7.89, 9.08, 10.15, and 11.10g/（kW.h）.If the waste heat of the dryer exhaust could be recovered to supply heat to communal heating system, the standard coal consumption rate for power generation could be further decreased by 8.43, 10.87, 12.96, 14.77 and 16.36g/（kW.h）. At the same time, 93.1, 121.3, 146 0, 167.7, and 187.0t/h water could be recovered. Finally, the arrangement of system and the exhaust heater were designed preliminarily taking moisture content been dried to 15% as an example.