首页|余热余压空气梯级利用的双涡流管有机朗肯循环综合性能分析与优化

余热余压空气梯级利用的双涡流管有机朗肯循环综合性能分析与优化

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  • 国家科技期刊平台
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为充分利用工业生产中的余热余压空气能量,同时降低 ORC 系统冷凝热损失,该文提出一种双涡流管 ORC 系统(ORC coupled with double vortex tubes,DVT-ORC).利用热源涡流管将放热后的余热余压空气分离成冷、热空气,冷空气用于工质冷却,热空气作为二级蒸发器的热源且换热后其余压用于驱动气动增压泵;利用工质涡流管将透平乏气分离成冷、热气流,热气流经气动增压泵升压再循环,冷气流进入空气冷却器冷却.以 150℃、0.6 MPa 的空气为初始热源,R245fa 为工质,建立热力与经济的多目标优化模型,分析双涡流管冷流比和透平排气压力对系统综合性能的影响;采用遗传算法进行优化,确定系统最优工况.结果表明:当热源涡流管冷流比大于 0.3 时,DVT-ORC输出功大于基本ORC输出功,工质涡流管与空气冷却器的㶲损失之和较基本ORC系统冷凝器的㶲损失最大可减小1 240.32 kW,单位电力生产成本较低,DVT-ORC系统热力性与经济性提升.系统最佳运行工况在透平排气压力为 0.300 7 MPa、工质涡流管冷流比为0.873 8、热源涡流管冷流比为0.894 2时,对应的净输出功为173.94 kW、热效率为13.57%、单位电力生产成本为0.415元/(kW·h).
Comprehensive Performances Analysis and Optimization of Organic Rankine Cycle Coupled With Double Vortex Tubes for Cascade Utilization of Waste Heat and Pressure of Air
An ORC system coupled with double vortex tubes(DVT-ORC)is proposed to make full use of the energy of the waste heat and pressure of air in industrial production and reduce the condensation heat loss of the ORC system.The waste heat and pressure air after heat release is separated into cold and hot air by the heat source vortex tube;the cold air is used for cooling the working fluid;the hot air is used as the heat source of the second evaporator;and the waste pressure after heat transfer is used to drive the pneumatic booster pump.The exhaust gas of the turbine is separated into cold and hot streamers by a working fluid vortex tube.The hot streamer is recirculated by a pneumatic booster pump and the cold streamer is fed into an air cooler for cooling.Using the air of 150℃and 0.6 MPa as the heat source,R245fa as working fluid,and multi-objective optimization models based on thermodynamics and economics are established to analyze the effects of cold flow ratios of double vortex tubes and the turbine exhaust pressures on the comprehensive performance of the DVT-ORC system.And optimization using a genetic algorithm is performed to determine the optimal operating conditions.The results show that when the cold flow ratio of the heat source vortex tube is greater than 0.3,the output work of the DVT-ORC is larger than that of the basic ORC,the sum of exergy losses of working fluid vortex tube and air cooler can be reduced by at most 1 240.32 kW compared to that of the condenser of the ORC system,and the levelized energy cost of DVT-ORC system is lower,so the thermal and economic performances of the DVT-ORC system are improved.The DVT-ORC system works best when the exhaust pressure of the turbine is 0.300 7 MPa,the cold flow ratio of the working fluid vortex tube is 0.873 8,and the cold flow ratio of the heat source vortex tube is 0.894 2.The corresponding net output work is 173.94 kW,the thermal efficiency is 13.57%,and the levelized energy cost is 0.415Yuan/(kW·h).

waste heat and pressure of aircascade utilization of energyvortex tubeorganic rankine cyclecomprehensive performancesmulti-objective optimization

杨新乐、闫振超、卜淑娟、李惟慷、于宁、戴文智、王新

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辽宁工程技术大学机械工程学院,辽宁省 阜新市 123000

余热余压空气 能量梯级利用 涡流管 有机朗肯循环 综合性能 多目标优化

辽宁省自然科学基金面上项目辽宁省教育厅科研项目辽宁工程技术大学学科创新团队项目

2022-MS-398LJKMZ20220685LNTU20TD-15

2024

10.13334/j.0258-8013.pcsee.230670

中国电机工程学报
中国电机工程学会

中国电机工程学报

CSTPCD北大核心
影响因子：2.712
ISSN：0258-8013
年,卷(期)：2024.44(8)
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