一种利用低温热源和LNG冷能的新型冷、热、电联供系统  

A Novel Combined Cooling,Heating and Power System Using Low-temperature Heat Source and LNG Cold Energy

作　　者：陈崇 王国付[1] CHEN Chong;WANG Guo-fu(School of Petroleum and Natural Gas Engineering,Liaoning Petrochemical University,Fushun Liaoning113001,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001

出　　处：《当代化工》2023年第5期1186-1190,共5页Contemporary Chemical Industry

基　　金：辽宁省博士科研启动基金计划项目(项目编号:2020-BS-227)。

摘　　要：对一种低温热源利用效率高、LNG冷能回收率高的新型冷、热、电联合系统进行了热力学分析。该系统包括一个基于氨水朗肯循环的制冷和制热的联合循环和一个液化天然气发电循环,每个部件的质量、能量和物料都处于平衡状态。为了进行能量和[火用]分析,根据以下性能标准对该系统进行研究:净输出功、制热输出、制冷输出、第一定律效率和第二定律效率。仿真结果表明,可计算出净功率输出、制热功率输出、制冷功率输出、第一定律效率和第二定律效率分别为3650 kW、281.1 kW、1462.55 kW、53.74%、42.7%。通过分析表明,在具有相当制冷量的情况下,系统在热效率和[火用]效率方面均表现出良好的性能。对系统进行了参数灵敏度分析,研究氨汽轮机进口压力、LNG汽轮机进口压力、冷凝器温度、热源温度、氨水中氨质量流量等关键因素对系统性能的影响。参数分析结果表明,在较高的进口压力和热源温度下,或在较低的凝汽器温度和氨水中氨质量流量下,均可获得较高的第一定律效率。而在较低的凝汽器温度和氨水中氨质量流量或较高的液化天然气压力和热源温度下,可获得较高的第二定律效率。在不同的氨涡轮进口压力下,第一定律和第二定律效率保持不变。Thermodynamic analysis of a new type of combined cooling,heating and electricity system with high utilization efficiency of low temperature heat source and high recovery rate of LNG cold energy was carried out.The system includes a new cogeneration cycle for cooling and heating based on the ammonia-water Rankine cycle and an LNG power generation cycle,and mass,energy and species balance are premised for every component.For energy and exergy analysis purpose,the performance of the system was investigated based on the following performance standard:net work output,heating output,cooling output,first-law efficiency and second-law efficiency.In this way,the simulation indicated that the net power output,heating output,cooling output,first-law efficiency and second-law efficiency were calculated 3650 kW,281.1 kW,1462.55 kW,53.74%,and 42.7%,showing a good behavior in the aspect of net electrical efficiency and exergy efficiency with a considerable refrigerating capacity through the analysis.Moreover,a parametric sensitive analysis was implemented in order to master the impact of key factors,namely,ammonia turbine inlet pressure,LNG turbine inlet pressure,condenser temperature,heat source temperature and ammonia mass flow in ammonia water on the performance of the system.The results of the parametric analysis showed that a higher first-law efficiency could be gained at higher LNG turbine inlet pressures and heat source temperatures or at lower condenser temperatures and ammonia mass flows in ammonia water,while a higher second-law efficiency could be obtained at lower condenser temperatures and ammonia mass flows in ammonia water or at higher LNG pressures and heat source temperatures.And at various ammonia turbine inlet pressure,the first-and second-law efficiency remained constant.

关 键 词：液化天然气 低温热源 能量分析 [火用]分析 

分 类 号：TQ015[化学工程]