Exergy analysis of gas turbine trigeneration system for combined production of power heat and refrigeration
Exergy analysis of gas turbine trigeneration system for combined production of power heat and refrigeration
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DOI：
10.1016/j.ijrefrig.2008.06.007
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发表时间：
2009-05
期刊：
影响因子：
--
通讯作者：
A. Khaliq
中科院分区：
文献类型：
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作者：
A. Khaliq
提出了一种以常规燃气涡轮机循环为高温热源、余热锅炉为工艺热源、蒸汽吸收式制冷为制冷剂的三联产系统概念。采用第一、第二定律相结合的方法，计算分析了总压比、涡轮机入口温度、燃烧室和余热锅炉压降以及蒸发器温度对系统各部件火用损失、第一定律效率、电热比和第二定律效率的影响。热力学分析表明，压比和涡轮机入口温度对燃烧室和余热锅炉的火用损失影响较大，而压降和蒸发器温度对火用损失影响不大。蒸汽吸收式制冷循环和余热锅炉的过程热压力和蒸发器温度会对各部件造成显著的火用破坏。它还表明，最大火用在燃烧和蒸汽发生过程中被破坏，这代表了整个系统中总火用破坏的80%以上。三联产、热电联产和燃气涡轮机循环的第一定律效率、电热能比和第二定律效率随总压力比和涡轮机入口温度的变化而显著变化，但压降、过程热压力和蒸发器温度的变化表明这些参数的变化很小。决策者应该发现本文中包含的方法在先进的热回收系统的比较和选择中是有用的。
A conceptual trigeneration system is proposed based on the conventional gas turbine cycle for the high temperature heat addition while adopting the heat recovery steam generator for process heat and vapor absorption refrigeration for the cold production. Combined first and second law approach is applied and computational analysis is performed to investigate the effects of overall pressure ratio, turbine inlet temperature, pressure drop in combustor and heat recovery steam generator, and evaporator temperature on the exergy destruction in each component, first law efficiency, electrical to thermal energy ratio, and second law efficiency of the system. Thermodynamic analysis indicates that exergy destruction in combustion chamber and HRSG is significantly affected by the pressure ratio and turbine inlet temperature, and not at all affected by pressure drop and evaporator temperature. The process heat pressure and evaporator temperature causes significant exergy destruction in various components of vapor absorption refrigeration cycle and HRSG. It also indicates that maximum exergy is destroyed during the combustion and steam generation process; which represents over 80% of the total exergy destruction in the overall system. The first law efficiency, electrical to thermal energy ratio and second law efficiency of the trigeneration, cogeneration, and gas turbine cycle significantly varies with the change in overall pressure ratio and turbine inlet temperature, but the change in pressure drop, process heat pressure, and evaporator temperature shows small variations in these parameters. Decision makers should find the methodology contained in this paper useful in the comparison and selection of advanced heat recovery systems.