Abstract: With the rapid advancement of ecological civilization construction in China, energy utilization methods such as recycling industrial waste heat and developing clean energy have gradually received widespread attention in the market. In this paper, a dual⁃loop cycle⁃kalina (DORC⁃KC) cogeneration system based on LNG cold energy utilization was designed. In addition, a new method for reducing acid gas emissions from industrial waste heat was proposed. Through the construction of the system thermodynamic model, the key thermodynamic parameters affecting the system carbon capture were analyzed in detail. The results show that the top cycle in the double cycle uses cyclopentane as the working fluid. By increasing the evaporation temperature and evaporation pressure, the maximum net output of the system is 367.9 kW,and the thermal efficiency is 33.29%. In the Kalina cycle, factors such as flux and concentration have a positive impact on system efficiency. The optimal thermal efficiency is 15.42% and the cold energy recovery efficiency is 20.65%. The reduction in compression pressure reduces the amount of circulating water but increase the quantity of the liquefaction of CO2. When the compression pressure is 472 kPa, the system has the highest exergy efficiency of 34.30%, carbon capture rate of 47.00%, and the amount of recycled water recovered is 167 616 t.

Key words: LNG cold energy, Dual?loop cycle, Waste heat recovery, Circulating water, CO2 capture

摘要： 随着我国对生态文明建设的快速推进，回收工业余热、开发清洁能源等能源利用方式逐渐受到市场的广泛关注。设计了一种基于LNG冷能利用的双循环⁃卡琳娜（DORC⁃KC）冷电联供系统，并在此基础上提出了降低工业余热中酸性气体排放的新方法。通过构建系统热力学模型，对影响系统碳捕集的关键热力学参数进行了详细分析。结果表明，双循环中的顶循环采用环戊烷为工质，提升蒸发温度和蒸发压力，系统的最大净输出功为367.9 kW，热效率为33.29%；在卡琳娜循环中，工质流量和浓度等因素对系统效率产生积极的影响，其最佳热效率和冷㶲回收效率分别为15.42%和20.65%。压缩压力的降低，减少了循环水的冷却量，提高了CO2的液化量。当压缩压力为472 kPa时，系统的㶲效率最大，为34.30%，碳捕集率为47.00%，循环水回收量为167 616 t。

关键词: LNG冷能, 　双循环, 　余热回收, 　循环水, 　CO2捕集