用于冶金烟气热回收的复合式换热器设计与特性分析  

Design and Characteristic Analysis of Composite Heat Exchanger for Metallurgical Flue Gas Heat Recovery

作　　者：郝宏滨 徐建新[1] 王华[1] HAO Hongbin;XU Jianxin;WANG Hua(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《昆明理工大学学报(自然科学版)》2025年第1期1-9,共9页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家重点研发计划项目(2022YFC3902000);国家自然科学基金项目(52166004);云南省科技重大专项(202202AG050002,202202AG050007).

摘　　要：本研究提出了基于低品位烟气废热回收和间壁式换热的新型复合式直接接触换热器,在回收低品位烟气废热的同时能够较大提高有机朗肯循环的热效率.考虑到陶瓷的耐高温性以及耐腐蚀性,螺旋通道内采用规整的陶瓷填充材料,最大限度地回收低品位烟气废热,同时增加换热器内部的扰动和换热效率.探讨了在6种不同温度和6个不同流量比组合循环下的热经济性,并与直接接触式换热器进行了比较.结果表明:复合式换热器的体积换热系数、[火用]效率、效能、热效率和气体介质出口温度均显著高于直接接触换热器.复合式换热器在提高换热器性能的同时又可以大限度地回收利用低品位烟气.A novel compound direct contact heat exchanger based on low-grade flue gas waste heat recovery and inter-wall heat exchange is proposed,which can significantly improve the thermal efficiency of the organic Rankine cycle while recovering low-grade flue gas waste heat.Considering the high-temperature resistance and corrosion resistance of ceramics,regular ceramic packing materials are used inside the spiral channels to maximize the recovery of low-grade flue gas waste heat,while also increasing the disturbance and heat transfer efficiency inside the heat exchanger.The thermal economy under six different temperatures and six different flow rate ratio combinations of the cycle was discussed and compared with that of a direct contact heat exchanger.The results show that the volumetric heat transfer coefficient,exergy efficiency,effectiveness,thermal efficiency,and gas medium outlet temperature of the compound heat exchanger are all significantly higher than those of the direct contact heat exchanger.In summary,the compound heat exchanger can improve the performance of the heat exchanger while maximizing the recovery and utilization of low-grade flue gas.

关 键 词：直接接触 体积传热系数 工业烟气 传热 

分 类 号：TP083.1[自动化与计算机技术] TK115[动力工程及工程热物理—热能工程]