炼油厂氢气网络柔性优化

Flexible optimization of refinery hydrogen network

随着炼油厂对氢气的需求量不断扩大,氢气系统已成为炼油厂的重要组成部分。炼油厂氢气网络的优化设计既要实现总成本最小的经济性目标,还要保证各种工况下氢气系统的安全稳定运行。针对炼油厂氢气系统不断变化的工况和氢气需求,提出了炼油厂氢气网络柔性优化策略,建立了多工况下的氢气网络柔性优化混合整数非线性规划(MINLP)模型,并对优化模型进行了线性化处理,采用优化建模工具Lingo建模求解。采用本文提出的柔性优化策略对某炼油厂氢气网络进行了柔性优化设计,与炼油厂的原始氢气网络对比表明,柔性优化后的网络可操作性强且具有较好的柔性调节能力,既节省了大量的运行成本,又为各种工况下氢气系统的安全稳定运行提供了保障,对实际炼油厂氢气网络的优化管理起了指导作用。

The hydrogen system has become an important component of the refinery with the increasing demand of hydrogen.It is significant for the optimization of the hydrogen network to realize the minimization of economic objectives and stable operation under all the operation conditions.A flexible optimization strategy is proposed based on the varying operation conditions and demand of hydrogen system in refinery.A mixed integer nonlinear programming（MINLP）model is formulated to optimize the hydrogen network under multi-scenarios.Then the MINLP model is linearized and solved with Lingo software.A case study based on the data from a refinery is showed to demonstrate the effectiveness and feasibility of the presented flexible optimization strategy.The comparison between the proposed strategy and the original hydrogen network shows that the presented flexible optimization strategy has better flexibility,and significant savings and stable operation of hydrogen system is realized.The proposed strategy plays an important role in guiding the management of hydrogen system in refinery.