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热力学性能是评价燃气分布式能源系统性能的核心和基础,同时对其他的技术性能指标也会产生影响。文章引进一种新的思路重新定义折合发电效率,结合相对节能率和节能系数组成评价模式从能量“质和量”的角度共同评价联供系统的热力学性能,阐明了机体散热和烟气逸漏、过剩空气系数、燃气不完全燃烧等因素对联供系统的热力学性能的影响机理。结果表明:经重新定义的折合发电效率与相对节能率和节能系数的组合评价模式用来评价联供系统的节能性和热力学性能更加准确;通过改善机体材料和密封泄漏处来降低机体导热系数和系统逸漏系数,维持机体燃气燃烧过剩空气系数为1.08~1.12,控制燃气燃烧炉膛温度在1800℃左右和分解物质的分压力在0.3 MPa以上,这些措施都可以提高系统的热力学性能。
Thermodynamic performance is the core and foundation for evaluating the performance of gas distributed energy system, and affects other technical performance indexes as well. This paper introduces a new idea to redefine the power conversion efficiency, combined with the relative energy saving rate and energy saving coefficient constitute the evaluation model from the energy “quality and quantity ” point of view to evaluate the thermodynamic performance of the co-fed system, to clarify the body cooling and flue gas Leakage, excess air coefficient, incomplete combustion of gas and other factors on the thermodynamic performance of co-fed system. The results show that the redefined combined power-saving efficiency, relative energy-saving rate and energy-saving coefficient combined evaluation model can be used to evaluate the energy-saving and thermodynamic performance of the co-fed system more accurately. By improving the body material and sealing leakage to reduce the thermal conductivity and System escape coefficient, maintain the body air combustion excess air coefficient of 1.08 to 1.12, control the gas combustion furnace temperature at about 1800 ℃ and the partial pressure of decomposition material is above 0.3 MPa, these measures can improve the system’s thermodynamic properties.