基于压缩式换热的低温工业余热供热系统运行特性及应用

OPERATION CHARACTERISTICS AND APPLICATION OF LOW TEMPERATURE INDUSTRIAL WASTE HEATING SYSTEM BASED ON COMPRESSION HEAT EXCHANGER

基于北方地区可利用的大量低温工业余热和过剩电力资源,提出基于压缩式换热的低温工业余热供热新技术,并结合案例从热力学和经济学角度对其进行分析。结果表明,压缩式换热机组可将一次热网回水温度降至20℃,可极大提高一次热网经济输热距离,有效解决工业余热远距离经济输热的瓶颈问题。当废热价格为20￥/GJ、一次热网输热距离为60 km时,新型供热系统的供热成本比常规燃煤热电联产供热成本低3￥/GJ,且其投资回收期（约为4 a）低于供热行业基准投资年限,每年可节省标准煤16.7 kg/m^2。

Considering the large amount of low-temperature industrial waste heat and wind power generation resourcesavailable in the northern region,the new heating technology of low temperature industrial waste heat based oncompression heat exchangers was put forward,and in combination with the case,it was analyzed from the perspective ofthermodynamics and economics. The results show that the compression heat exchanger can reduce the return watertemperature of primary heat network to 20 ℃,which greatly increases the economical heat transmission distance ofprimary heat network,and can effectively solve the bottleneck problem of long-distance economical heat transmission ofindustrial waste heat. For the new industrial waste heat district heating system case,when the waste heat price is 20 ￥/GJand the heat transmission distance of the primary heating network is 60 km,the heating cost of the new heating system islower about 3 ￥/GJ than that of the conventional coal-fired heating and power cogeneration,and its investment recoveryperiod（about 4 years）is lower than the benchmark investment period of the heating industry,saving 16.7 kg ce/m^2 peryear.