Synthesis of heat exchanger networks at subambient conditions with compression and expansion of process streams
Synthesis of heat exchanger networks at subambient conditions with compression and expansion of process streams
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DOI：
10.1002/aic.12412
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发表时间：
2011-08
期刊：
影响因子：
3.7
通讯作者：
A. Wechsung;A. Aspelund;T. Gundersen;P. I. Barton
中科院分区：
文献类型：
--
作者：
A. Wechsung;A. Aspelund;T. Gundersen;P. I. Barton
本文提出了一种优化配方，用于合成热交换器网络，其中工艺流的压力水平可以调整，以提高热集成。尤其重要的是，在亚环境条件下，这允许功、温度和基于压力的火用相互转换，从而减少了昂贵的冷设备的使用。此外，通过调整流体温度和压力来密切跟踪复合曲线，从而提高了火用效率。该公式通过一个简单的例子进行了展示，并应用于海上天然气液化工艺设计的案例研究。在优化的帮助下，演示了该工艺如何从液氮和二氧化碳流中提取火用，以支持天然气流的液化，而无需额外的设施。这一过程是液化能源链的一部分，液化能源链为发电提供天然气，同时促进二氧化碳的封存。©2010美国化学工程师学会，2011
This article presents an optimization formulation for the synthesis of heat exchanger networks where pressure levels of process streams can be adjusted to improve heat integration. Especially important at subambient conditions, this allows for the interconversion of work, temperature, and pressure-based exergy and leads to reduced usage of expensive cold utility. Furthermore, stream temperatures and pressures are tuned for close tracking of the composite curves yielding increased exergy efficiency. The formulation is showcased on a simple example and applied to a case study drawn from the design of an offshore natural gas liquefaction process. Aided by the optimization, it is demonstrated how the process can extract exergy from liquid nitrogen and carbon dioxide streams to support the liquefaction of a natural gas stream without additional utilities. This process is part of a liquefied energy chain, which, supplies natural gas for power generation while facilitating carbon dioxide sequestration. © 2010 American Institute of Chemical Engineers AIChE J, 2011