基于EBSILON的冷热电三联供系统及能量利用特性

Energy Supply Characteristics of Combined Cooling Heating and Power System Based on EBSILON

为研究天然气冷热电三联供分布式能源(combined cooling heating and power,CCHP)系统的能量利用特性,以某冷热电三联供能源站作为研究对象,利用EBSILON软件分别建立内燃机组、烟气-热水型溴化锂吸收式冷水机组、换热器组件等模型,分析了烟气-热水型溴化锂吸收式冷水机组在不同烟气与缸套水热源驱动下的制冷系数(coefficient of refrigeration,COP)特性,内燃机组不同负荷率下系统的综合供能特性。研究结果表明,CCHP采用单一热源制冷时,烟气热水型溴化锂吸收式冷水机组以烟气作为驱动热源可获得较高的COP,而以缸套水作为驱动热源时COP较低;在同时具备冷热负荷情况下,高温烟气更适合作为制冷热源,而高温缸套水更适合充当制热热源;采用双热源驱动制冷与单一热源相比,具有更高的综合能源利用效率,在内燃机75%负荷率、WY1工况下,COP与综合能源效率达到最大值1.28与92.0%;而在50%负荷率时采用缸套水作为单一热源驱动制冷机时,COP与综合能源利用效率达到最低值,分别为0.74与76.1%。模型分析得出的CCHP系统综合供能特性,在一定程度上可有效指导冷热电三联供能源站的高效运行。

To study the energy utilization characteristics of combined cooling heating and power(CCHP)system,a CCHP energy station was taken as the research object,for which the models of internal combustion unit,flue gas hot water lithium bromide absorption chiller,and heat exchanger module were established by EBSILON software.The characteristics of coefficient of refrigeration(COP)of absorption chiller driven by different flue gas and cylinder liner water sources,and the system integration under different load rates of internal combustion engine unit were analyzed.The results show that when CCHP adopts single heat source,the COP value of absorption chiller with flue gas as driving heat source was higher than that with cylinder liner water as driving heat source.Under the condition of cooling and heating load at the same time,high temperature flue gas was more suitable for refrigeration heat source,and high temperature cylinder liner water was more suitable for heating source.Compared to the single-heat-source–driven absorption refrigeration,the double-heat-source driven absorption refrigeration had higher comprehensive energy efficiency,of which the COP value and comprehensive energy efficiency reached the maximum value of 1.28 and 92.0%,respectively,under 75%load rate of internal combustion engine and WY1 condition.On the other hand,when cylinder liner water was used as single heat source to drive refrigerator at 50%load rate,the lowest value of COP and comprehensive energy efficiency was 0.74 and 76.1%,respectively.The comprehensive energy supply characteristics of CCHP system analyzed by the model could effectively guide the efficient operation of CCHP energy station.