单工质低温余热发电循环性能分析

为了提高能源利用的高效性和经济性，推进有机朗肯循环系统在低温余热发电领域的应用。通过建立热力学模型，并用Matlab软件进行编程，调用NIST Refprop数据库，选取六氟丙烷作为循环工质，模拟分析有机朗肯循环系统各方面性能。在采用循环输出功率、㶲效率和热效率等热力学指标研究系统热力性能的基础上，分别采用换热面积和CO₂年减排量作为评价系统经济性能和环保性能的指标。研究结果表明：单变量时，在冷凝压力为150 kPa时能保证系统性能达到最佳。多变量时，热源温度提高会使经济性能大幅度降低，而系统的热力性能和环保性能有所提高，综合考虑可取热源温度为155 ℃~185 ℃；当系统各性能分别保证最佳时，蒸发压力随热源温度呈现不同形式的变化，但始终不超过3350 kPa。

Performance Analysis of Low Temperature Waste Heat Power Generation Cycle with Single Working Fluid

In order to improve the efficiency and economy of energy utilization, promote the application of the organic Rankine cycle system in the field of low-temperature waste heat power generation. In this paper, by establishing a thermodynamic model and programming with MATLAB software, calling the NIST Refprop database, selecting hexafluoropropane as the circulating working fluid, and simulating and analyzing various aspects of the organic Rankine cycle system performance. Based on the use of thermodynamic indicators such as cycle output power, exergy efficiency and thermal efficiency to study the thermal performance of the system, the heat exchange area and the annual CO₂ emission reduction were used as indicators to evaluate the economic performance and environmental performance of the system. The research results show that: when the condensing pressure is 150 kPa, the system performance can be ensured to achieve the best performance when the single variable is used. In the case of multiple variables, the increase of the heat source temperature will greatly reduce the economic performance, and effectively improve the thermal performance and environmental performance of the system. Comprehensively consider the temperature of the heat source to be 155 ℃~185 ℃; when the performance of the system is guaranteed to be the best, The evaporation pressure changes in different forms with the temperature of the heat source, but it never exceeds 3350 kPa.