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与传统单一吸收式制冷循环相比,混合工质功冷联产循环更有利于提高中温工业余热的利用效率,但能效提高的机理研究仍然不够深入。本研究构建了简化的氨水功冷联产循环系统和氨水吸收式制冷循环系统模型,提出了公平的比较基准,通过流程结构与热力学特性的分析和比较,揭示了混合工质功冷联产循环与吸收式制冷循环在能量转换与利用方面的差异,分析了功冷联产循环的性能提升机理。指出透平膨胀程度是影响热能在动力子循环与制冷子循环间分配比例和梯级利用程度的关键因素,并研究了其对系统性能的影响。
Compared with the traditional single absorption refrigeration cycle, the mixed refrigerant cooling and co-generation cycle is more conducive to improving the utilization efficiency of industrial waste heat at medium temperature, but the mechanism of improving energy efficiency is still not deep enough. In this study, a simplified model of ammonia-water co-generation and cooling system and ammonia absorption refrigeration cycle were constructed, and a fair comparison criterion was put forward. Through analysis and comparison of the process structure and thermodynamic characteristics, the co-generation and cooling cycles And absorption refrigeration cycle in the energy conversion and utilization of the differences, analysis of the performance increase mechanism of co-generation cycle. It is pointed out that the degree of expansion of the turbine is the key factor that affects the distribution ratio and the degree of cascade utilization of thermal energy between the power sub-cycle and the cooling sub-cycle and studies its influence on the system performance.