基于最大热回收下三厂间接热集成的串并结合的连接方式

A serial-parallel combined connection pattern for indirect heat integration among three plants based on maximum heat recovery

采用中间介质的厂际热集成可以有效地回收系统内的余热资源,大大降低能耗,而厂际间中间介质循环的连接方式关系到最大热回收潜力和投资成本的大小。本文在中间介质循环串联、分流和并联3种基本的连接方式的基础上,提出了串并结合的连接方式,并介绍了其厂际位移复合曲线和中间介质线的形成。选取的案例表明:串并结合模式的最大热回收潜力可以高于串联和分流式,甚至可以与3种基本连接方式中热回收潜力最大的并联式相当;中间介质循环管线的成本随厂际间距离的不同而变化,应根据其距离特点选取合适的连接方式。

More opportunity to utilize the waste heat in several plants can be brought by indirect interplant heat integration through an intermediate medium. The connection patterns of intermediate medium circles concern the maximum heat recovery potential and investment costs. The three basic connection patterns of intermediate medium circles are serial, split, and parallel, respectively. Based on these patterns, a serial-parallel combined connection pattern was presented in this paper. Furthermore, the interplant shifted composite curves and intermediate medium curves of this pattern were also illustrated. Results of a case study showed that, the serial-parallel combined connection pattern can recover more heat than the serial and spilt patterns. Its maximum heat recovery potential even approaches to that of the parallel pattern, which can always recover the most heat among the three basic connection patterns. The pipe costs of intermediate medium circles vary with the distances between plants. A proper connection pattern should be selected according to the characteristics of distances between plants.