Abstract:

The comprehensive research and application of heat exchanger networks has been proven to be effective in improving energy efficiency, and the comprehensive research on power exchange networks for recovering higher quality energy is still in its infancy. To solve the problem of stream matching limited by complex driving force constraints in indirect work exchange network synthesis, an extended superstructure considering inter-stage heat integration is established in this paper. Based on the linear fitting operation curves of compressors and turbines, an identification method is proposed for searching feasible stream matches between work sources and sinks. Specific to the highly non-convex and non-linear relationship among pressure, flowrate and temperature, a relaxation strategy is proposed to optimize the inlet temperature of each stage by heat integration, and a mixed-integer nonlinear programming model is established with the objective of minimizing the total annual cost (TAC) model is solved using GAMS and the optimal indirect work exchange network structure is obtained. Finally, an example is given to verify the validity and feasibility of the proposed method.

Key words: indirect power exchange network, superstructure, heat integration, stream matching, mixed-integer nonlinear programming, optimization, systems engineering, model

摘要：

换热网络综合的研究和应用对于提高能源利用率已被证明是有效的，而用于回收更高品质能量的功交换网络综合的研究仍处于起步阶段。针对间接式功交换网络综合中复杂推动力约束对流股匹配的制约问题，构建了一种考虑级间热集成的拓展超结构，基于线性拟合压缩机和涡轮机的操作曲线，提出了功源与功阱间流股匹配的识别方法；针对压力、流量与温度的高度非凸非线性关系，提出了采用热集成优化每一级入口温度的松弛策略，建立了以年度总费用最小为目标的混合整数非线性规划模型，通过GAMS求解得到最优的间接式功交换网络结构。最后通过一个算例分析，验证所提方法的有效性和可行性。

关键词: 间接式功交换网络, 超结构, 热集成, 流股匹配, 混合整数非线性规划, 优化, 系统工程, 模型