集成恒压压缩空气储能的燃气轮机CCHP系统特性研究

Study on System Characteristics of Gas Turbine CCHP Integrated with Constant-pressure Compressed Air Energy Storage

燃气轮机冷热电三联供(CCHP)技术发展前景广阔,但存在部分负荷运行效率不高、热-电输出耦合性强、热电比调节不灵活等问题。构建了集成恒压压缩空气储能(CAES)的新型燃气轮机CCHP系统,建立了压气机、燃烧室、透平、余热锅炉、换热器、喷射器、水泵/水轮机等部件的热力学模型,分析了采用抽气-释气流量调节策略的系统运行特性。结果表明:抽气、释气系数在0~0.2内时,新型系统热电比调节范围为0.58~2.27,一次能源利用率稳定在58.1%~59.5%,[火用]效率不低于32.2%,可实现宽工况高效运行。

Gas turbine combined cooling,heating and power(CCHP)technology has excellent development and application prospects.However,there are many problems such as low efficiency in partial load operation,strong coupling of thermal-electrical output and inflexible regulation of thermoelectric ratio etc.To solve these problems,a novel CCHP system based on gas turbine and constant-pressure compressed air energy storage(CAES)was developed.The thermodynamic models of components such as the compressor,combustion chambers,turbine,waste heat boiler,heat exchanger,injector and water pumps/turbine,were developed and used to analyze the operational characteristics of the CCHP system under an extraction-release gas flow regulation strategy.Results show that when the extraction-release coefficient is between 0 and 0.2,the CCHP system has a thermoelectric ratio regulating range of 0.58-2.27.During the variable load operation process,the primary energy utilization rate of the CCHP system changes within the range of 58.1%-59.5%,and the exergy efficiency is no less than 32.2%.For the developed CCHP system,the high comprehensive energy efficient and flexibility can be achieved under wide operating conditions.