基于热阻分析的余热发电系统优化设计  

Optimization Design of Waste Heat Power Generation Systems Based on Thermal Resistances Analyses

作　　者：殷谦[1] 杜文静[1] 程林[1] YIN Qian;DU Wen-Jing;CHENG Lin(Institute of Thermal Science and Technology, Shandong University, Shandong 250061, China)

机构地区：[1]山东大学热科学与工程研究中心,济南250061

出　　处：《工程热物理学报》2018年第6期1303-1310,共8页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划资助(No.2013CB228305)

摘　　要：水泥工业的余热回收利用对于工业节能减排具有重要的意义。本文提出了一种应用于水泥工业的余热发电系统,系统包括蒸发器、过热器、凝汽器、汽轮机以及集热器系统.基于系统的热阻分析,构建了设计参数与系统结构及运行参数之间的数学关系,以系统所需总热导为目标函数,通过拉格朗日乘子法对系统进行了优化设计,获得了优化参数。结果表明:优化后的集热器系统所需热导相比优化前降低了10%左右,优化的汽化温度随总流量的增加而降低,余热发电系统所需总热导随凝汽器冷却水温以及汽轮机做功的提高而增加。To reduce heat loss from the shell of a rotary kiln is of great significant for saving energy consumption in cement production. In this paper, a waste heat power generation system is proposed which contains an evaporator, a superheater, a condenser, a turbine and a heat recovery system with nine heat recovery exchangers. Then, integration of thermodynamic and thermal resistance analyses yields mathematic relations between the system requirements and the design parameters, i.e.the thermal conductance and mass flow rates, which form the constraint equation group of a global optimization model. With the aid of the Lagrange multiplier method, the optimized structrual and operational parameters are obtained. The results illustrate that the optimized thermal conductance of the heat recovery system is reduced by 10% compared with the value before optimization. As the mass flow rate of the system increases, the evaporation temperature decreases. The total thermal conductance of the whole system is increased as the cooling water temperature increases and the work output of the turbine increases.

关 键 词：节能 余热发电系统 热阻分析 优化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]