Optimisation for the retrofit of large scale heat exchanger networks with different intensified heat transfer techniques
Optimisation for the retrofit of large scale heat exchanger networks with different intensified heat transfer techniques
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DOI：
10.1016/j.applthermaleng.2012.04.038
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发表时间：
2013-05
影响因子：
6.4
通讯作者：
M. Pan;I. Bulatov;Robin Smith;Jin-Kuk Kim
中科院分区：
文献类型：
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作者：
M. Pan;I. Bulatov;Robin Smith;Jin-Kuk Kim
强化传热（IHT）技术最近已被用于过程工业中的改造，通过促进传热强化而无需网络拓扑结构修改而导致换热器网络（HEN）中的显著节能。在本文中，一种优化方法已被开发用于处理的改造大规模的HENs中的网络内的强化传热的位置和它的强化程度进行了系统的识别，给定的目标函数和设计约束，包括在现有的热回收系统的拓扑限制。开发的优化框架是基于一个相对简单的混合整数线性规划（MILP），它可以有效地处理与非线性相关的计算困难的迭代优化。在改造后的HENs中，几种传统的强化传热技术是可用的，包括管侧强化（扭带插入物，螺旋线插入物和内部翅片），和壳侧强化（外部翅片和螺旋挡板）。通过实施一种或多种强化技术，可以选择合适的交换器用于增强，以在非常低的改造成本内增加整个网络的能量回收。一个大型的工业案例研究被认为是证明所提出的优化方法的有效性和效率。
Intensified heat transfer (IHT) techniques have recently been used for retrofit in the process industry, leading to significant energy saving in heat exchanger network (HEN) by facilitating heat transfer intensification without network topology modification. In this paper, an optimisation method has been developed for dealing with the retrofit of large scale HENs in which the location of intensified heat transfer within the network and its degree of intensification are systematically identified, given the objective function and design constraints, including topological limitation in the existing heat recovery systems. The optimisation framework developed is based on iterative optimisation of a relatively simple mixed integer linear programming (MILP), which can effectively deal with computational difficulties associated with nonlinearity. In the retrofitted HENs, several conventional intensified heat transfer techniques are available, including tube-side intensification (twisted-tape inserts, coiled-wire inserts and internal fins), and shell-side intensification (external fins and helical baffles). Suitable exchangers can be selected for enhancement by implementing one or more intensification techniques to increase the whole network energy recovery within very low retrofit cost. A large-size industrial case study is considered to demonstrate the validity and efficiency of the proposed optimisation approach.