喷射式冷电联供系统优化分析

Optimization Analysis of a Combined Ejector-cooling and Power System

随着社会的发展,能源形势日益严峻,环境保护要求也越来越高,如何提高能源利用效率实现社会的可持续发展,成为越来越多学者的研究目标。基于能量品位进行梯级利用、多能互补的分布式能源系统是能源技术的重要发展方向,将正向有机朗肯循环和逆向制冷循环耦合的冷电联合循环是其中的一种形式。喷射器是冷电联合循环中的关键部件,应用一维等压混合模型对喷射器进行建模,并对循环进行热效率和㶲效率分析,包括冷凝温度、蒸发温度、蒸汽发生器出口温度和排气压力对循环性能的影响。对系统进行㶲分析发现,在蒸汽发生器、冷凝器和喷射器中㶲损失最大。

With the development of society,severe energy situation,as well as higher and higher environmental protection requirements,how to improve energy efficiency and achieve sustainable development of society has become the research goal of more and more scholars.The cascade utilization based on energy grade and multi-energy complementary distributed energy system are the important development direction of energy technology in the future.One of them is the combined cooling and electricity cycle,which combines the organic Rankine cycle with the ejector refrigeration cycle.The ejector is the key component in the combined cycle of cooling and electricity.The ejector was modeled by the most commonly used one-dimensional isobaric mixing model.The thermal efficiency and exergy efficiency of the cycle were analyzed.The effects of condensation temperature,evaporation temperature,outlet temperature of steam generator and exhaust pressure on the cycle performance were analyzed.The analysis of the system shows that the greatest loss occurs in steam generator,condenser and ejector.