考虑间接换热额外换热温差的间歇过程储热集成  

Integration of heat storage in batch processes considering additional approach temperature difference for indirect heat transfer

作　　者：刘昶 李士雨[1,2] 谢晓兰 LIU Chang;LI Shiyu;XIE Xiaolan(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;College of Chemical Engineering and Materials Science,Quanzhou Normal University,Quanzhou 362000,Fujian,China)

机构地区：[1]天津大学化工学院,天津300350 [2]泉州师范学院化工与材料学院,福建泉州362000

出　　处：《化工进展》2020年第1期72-79,共8页Chemical Industry and Engineering Progress

摘　　要：间歇过程流股间换热有直接换热和间接换热两种方式,通过储热介质进行间接换热会产生额外的换热温差。现有的夹点分析方法考虑间接换热额外换热温差后,难以得到经济且可行的储热集成方案。本文在夹点分析的基础上,提出了一种考虑间接换热额外换热温差的间歇过程储热集成方法。该方法首先使用不同的直接换热和间接换热温差进行热级联分析,确定储热集成后的最小冷、热公用工程用量,识别储热位置和储热量,并依据热级联分析结果,建立时间段温焓图确定储热介质温度,得到储热方案。然后,将储热流股转化为放热时间段的冷流股和需热时间段的热流股,进行换热网络综合与优化,得到符合实际应用的储热集成方案。最后,通过经典实例证明了所提方法的可行性和有效性。There are two modes of heat transfer in batch processes: direct and indirect. To achieve indirect heat transfer through a heat-transfer medium, an additional approach temperature difference is required. However, the current pinch analysis considering additional approach temperature difference can lead to uneconomical or infeasible design. A methodology for the integration of heat storage considering additional approach temperature difference for indirect heat transfer based on pinch analysis was proposed in this paper. Different minimum approach temperature differences were first used for direct and indirect heat transfer to obtain the utility target and to determine the configuration and the capacity of the heat storage units in the time-dependent heat cascade analysis. The time slice profiles were constructed based on the heat cascade analysis to determine the operating temperature of the heat storage units. Then the heat storage units were represented as hot and cold streams in the time periods with a heat surplus and deficit respectively, and an optimal network was obtained using the pinch design method. Finally, the applicability and effectiveness of the proposed methodology were demonstrated through two benchmark examples.

关 键 词：储热 间歇过程 夹点分析 换热网络 优化设计 

分 类 号：TQ021.8[化学工程]