Synthesis of flexible heat exchange networks and mass exchange networks
Synthesis of flexible heat exchange networks and mass exchange networks
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DOI：
10.1016/j.compchemeng.2007.01.013
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
Cheng-Liang Chen;P. Hung
中科院分区：
文献类型：
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作者：
Cheng-Liang Chen;P. Hung
提出了一种简单的策略来合成灵活的热交换网络（HEN）或质量交换网络（MEN），其中涉及入口工艺流的流量和温度（对于 HEN）或成分（对于 MEN）的预期扰动范围。网络综合问题被分解为三个主要迭代步骤：（1）根据有限数量的运行条件，综合年度总成本（TAC）最小的网络候选； (2)在不考虑规模限制的情况下进行灵活性测试，以验证当前候选网络是否适用于在预期运行范围内随机生成的大量不确定参数；当通过仿真证明网络配置不可行时，追加最违反候选网络约束的测试点，然后再次返回步骤(1)，合成新的候选结构； (3)考虑之前忽略的规模限制，对步骤(2)中合格的网络进行灵活性测试，必要时增加交换单元的规模。可能需要对这些设计步骤进行几次迭代才能获得理想的结果。本文还提供了几个数值示例，以证明所提出的策略对于合成柔性热交换网络或质量交换网络的适用性。
A simple strategy is proposed for the synthesis of flexible heat exchange networks (HEN's) or mass exchange networks (MEN's) that involves expected disturbance range in the flow rates and temperatures (for HEN's) or compositions (for MEN's) of the inlet process streams. The network synthesis problem is decomposed into three main iterative steps: (1) synthesizing a network candidate with a minimum total annual cost (TAC) according to a finite number of operating conditions; (2) performing flexibility test without considering the size restrictions to verify whether the current network candidate is operable for a large number of uncertain parameters that are generated randomly within the expected operating ranges; appending test point(s) that mostly violates the constraints of the candidate network when the network configuration is proved infeasible through simulations, then returning to step (1) again to synthesize a new candidate structure; (3) considering the size restraints that have been ignored previously, executing flexibility test to the network qualified in step (2), and increasing the size of exchange units if necessary. A few iterations of these design steps may be required to secure the desirable results. Also in this paper are several numerical examples supplied to demonstrate the applicability of the proposed strategy for the synthesis of flexible heat exchange networks or mass exchange networks.