Absorption heat exchangers for long distance heat transportation.

A novel system for long distance heat transportation using two types of absorption heat exchangers (AHEs) is prompted in this paper. Using the system, the industry waste heat at 65~70°C can be recovered and transported through a long distance pipeline. The transported temperature difference can be increased two times more than normal system based on conventional heat exchangers for heat transfer. Considering the reduction of the pipe network cost balance with the added AHEs cost, an economic balance distance is obtained, and when the distance is longer than the economic balance distance, the AHEs system can save the initial cost. The economic balance distance is in direct proportion to the transportation pipe diameter. Take the pipe with diameter 1020mm for example, the economic balance distance is about 28km. While when considering the transportation electricity consumption reduction of the novel system, the economic balance distance can be shortened The 1sttype AHEs has been developed for several years. The small sized AHE is introduced intensively, including the structure, the testing performance and the application projects, which constructs the building type heat supply system with a very wide application prospect.

本文提出了一种采用两类吸收式换热器（Absorption Heat Exchangers，AHEs）的长距离输热新型系统。借助该系统，可回收并通过长距离管道输送65~70℃的工业废热。其输送温差相较于基于传统换热器的常规输热系统可提升两倍以上。在统筹管网成本削减与新增吸收式换热器购置成本的平衡关系后，可得到经济平衡距离；当实际输热长度长于该经济平衡距离时，采用吸收式换热器的输热系统可降低初始投资成本。该经济平衡距离与输热管道管径呈正比关系。以管径1020mm的管道为例，其对应的经济平衡距离约为28km。若考量该新型系统的输送用电消耗削减效益，经济平衡距离可进一步缩短。第一类吸收式换热器的研发工作已开展多年。本文详细介绍了小型吸收式换热器，涵盖其结构、测试性能及应用案例，并以此搭建了应用前景极为广阔的楼宇供热系统。