燃气三联供和江水源热泵复合系统数学模型的建立和分析
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摘要
当今世界能源紧缺,燃气三联供和江水源热泵的复合系统能提高能源利用率,且之前研究较少。针对冷热电三联供和江水源热泵组成的复合联供系统,通过建立复合系统数学模型,对复合联供系统进行分析。建模的主要设备包括内燃机、烟气热水型吸收式制冷机组、江水源热泵机组。分析发现,内燃机的发电效率随着机组负载率的增加而增加,当机组负载率低于50%时,机组发电效率随着负载率降低而急剧下降,机组发电高效区间出现在50%-100%。烟气热水型吸收式制冷机组热力系数受冷却水温度及烟气温度的影响,冷却水温度越高热力系数越低,烟气温度越高热力系数越高。
The composite system of CCHP and river water source heat pump can increase energy efficiency, but few researches have been undertaken about it under the background of lack of energy. Aiming at the composite cogeneration system composed of the cold heat and power tri-generation system and the river water source heat pump system, this article carries on analysis of the composite cogeneration system through building the mathematical model. The main equipment includes internal combustion engines, gas hot water operated absorption refrigeration units and river water source heat pump units. Analysis shows that the power generation efficiency of internal combustion engine increases as the unit load rate increases. When the unit load rate is lower than 50%, the efficiency of generating units fall sharply as the load rate reduces. Generating efficient range of generating units appeared in 50%-100%. The thermal coefficient of hot water operated flue gas absorption refrigeration unit is affected by cooling water temperature and the flue gas temperature, the higher the cooling water temperature refrigeration coefficient is lower, the higher the flue gas temperature refrigeration coefficient is higher.
The composite system of CCHP and river water source heat pump can increase energy efficiency, but few researches have been undertaken about it under the background of lack of energy. Aiming at the composite cogeneration system composed of the cold heat and power tri-generation system and the river water source heat pump system, this article carries on analysis of the composite cogeneration system through building the mathematical model. The main equipment includes internal combustion engines, gas hot water operated absorption refrigeration units and river water source heat pump units. Analysis shows that the power generation efficiency of internal combustion engine increases as the unit load rate increases. When the unit load rate is lower than 50%, the efficiency of generating units fall sharply as the load rate reduces. Generating efficient range of generating units appeared in 50%-100%. The thermal coefficient of hot water operated flue gas absorption refrigeration unit is affected by cooling water temperature and the flue gas temperature, the higher the cooling water temperature refrigeration coefficient is lower, the higher the flue gas temperature refrigeration coefficient is higher.
引文
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[2]孔祥强,李瑛,王如竹,等.基于吸附制冷的微型冷热电联供系统实验研究[J].工程热物理学报,2006,27(S1):5-8.
[3]朱天生,吴静怡,吴大为.基于燃气内燃机的分布式冷热电联产系统应用分析[J].暖通空调,2009,39(10):108-111.
[4]X Q Kong,R Z Wang,Y Li,et al.Experimental investigation of a micro-combined cooling,heating and power system driven by a gas engine[J].International Journal of Refrigeration,2005,50(3):530-538.
[5]M Talbi,B Agnew.Energy recovery from diesel engine exhaust gases for performance enhancement and air conditioning[J].Applied Thermal Engineering,2002,22(6):693-702.
[6]Ajav E A,Bachchan Singh,Bhattacharya T K.Performance of a stationary diesel engine using vapourized ethanol as supplementary fuel[J].Biomass and Bioenergy,1998,15(6):493-502.
[7]何晓红.内燃机热电联产系统的变工况特性研究[D].北京:中国科学院研究生院,2008.
[8]王锡,杨勇平,宋之平.内燃机联产双源系统的敏感性和变工况特性[J].中国电机工程学报,2010,30(20):22-27.
[9]C C Chuang,D C Sue.Performance effects of combined cycle power plant with variable condensor pressure and loading[J].Energy,2005,(30):1973-1801.
[10]Kavanaugh S P,Woodhouse J G,Carter J R.Test results of water-to-air heat pumps with high cooling efficiency for ground-coupled applications[J].ASHRAE Transactions,1991.
[11]A L Snijders.Aquifer Seasonal Cold Storage for Space Conditioning:Some Cost-effective Applications[J].ASHRAE Transactions,1992,98:1015-1022.
[12]Jarvis peter,Jefferson Bruce,Parsons Simon.Floe structural characteristics using conventional coagulation for a high doc low alkalinity surface water source[J].Water Research Abbreviated,2006,40(14):2727-2737.