基于分液冷凝组分调控的非共沸ORC性能研究

Performance investigation of zeotropic ORC based on Liquid-vapor separation condensation and composition-adjustable

中文关键词: 有机朗肯循环  非共沸工质  分液冷凝  组分调控  热力学

英文关键词: organic Rankine cycle  zeotropic working fluid  liquid-separation condensation  composition-adjustable  Thermodynamics

中文摘要:

      低温余热广泛存在于地热和工业领域，开发和利用低温余热，有利于节能减排和保护环境。有机朗肯循环（Organic Rankine Cycle, ORC）是一种热电转换技术，能够有效地回收工业余热和开发地热能。当前ORC余热回收存在着效率不高、热-经济性低、变工况运行性能不理想等问题。基于ORC目前面临的问题，研究一种基于气液分离组分调控的新型LC-ORC循环系统，建立了LC-ORC系统的热力学模型，并对其进行性能分析和变工况运行研究，结果表明：利用分液冷凝组分调控技术后，与B-ORC系统相比，冷凝过程中的换热系数可提高6.43%，冷凝器换热面积降低了6.45%，单位面积输出功可提高2.62%，同时，LC-ORC系统还能增强系统对冷热源波动的适应性，提高系统变工况运行性能，净输出功可提高2.02%。

英文摘要:

      The low temperature waste heat is taking more and more attention, which is widely utilized in geothermal and industrial fields. This is beneficial to energy conservation, emission reduction and environmental protection. Or-ganic Rankine cycle is a heat-to-power technology. It can recover industrial waste heat and utilize geothermal energy effectively. However, low efficiency, poor operating performance under variable conditions and poor thermo- economy exist in the ORC recovering waste heat. Therefore, this work aims to build a novel LC-ORC system based on Liquid-vapor separation condensation and composition-adjustable. The thermo-dynamic model of LC-ORC model is formulated. The result indicates that condensation heat transfer coefficient can be increased by 6.43%, condensation heat transfer area can be reduced by 6.45%，the ratio of the net power output to the total heat transfer area is increased by 2.62% at the same conditions. Meanwhile, LC-ORC can enhance the adaptability of the system to the fluctuation of cold and heat sources and improve the performance of the system under variable operating conditions.