摘要
系统阐述了和计算的基本概念以及应用状态方程法(PR)进行计算的步骤和若干相关的技术细节,以"真空"为例对火用理论中较模糊的概念由低压造成的"负"作出理论和计算分析,认为它同低温一样,也是一种宝贵的火用源。运用"三环节"能流论的概念,对精馏塔的用火用过程拆分为塔体用和换热器用火用分析,得出了不同情况下精馏塔节能工作的着眼点需有所区别的结论;此外还对换热单元流程进行了细致的介绍,指出了换热设备的优化除了重视降低热火用损耗外,还需注意调节压的损耗以期达到进一步节能降耗的目的。
The first part of this paper explains the concept of exergy and gives calculation procedures of exergy by equation of state （PR） and some technical details. It also analyzes the obscure concept of ＂negative exergy＂ caused by low pressure, especially when the condition ＂vacuum＂ is taken into consideration, showing that like the exergy at a low temperature, ＂negative exergy＂ is another valuable kind of exergy. The last part of the paper contains exergy analysis reports about two important chemical processes, rectification and heat exchange with the support of the ＂three layers＂ theory. The research indicates that energy-saving in the process of rectification is a specific case study instead of adjusting reflux ratio only. In the process of heat exchange, the pressure exergy loss should be specially chosen as well as heat exergy loss to save expensive high level exergy electricity.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2007年第11期2697-2704,共8页
CIESC Journal
