余热电站热力系统建模及蒸汽参数优化

Modeling and Steam Parameter Optimization for the Thermodynamic System of a Waste Heat Power Plant

热力系统及蒸汽参数的选取是余热电站设计中首要的基础工作。以济钢烧结余热电站双压系统为例,建立了以最大发电净功率为目标函数的热力系统计算和蒸汽压力优化模型,编程验算了模型的正确性,分析了影响主汽压力优化的主要因素,研究了发电净功率随主汽压力的变化规律。结果表明,实例计算优化的最佳主汽压力为2.2MPa,比电站设计主汽压力高0.14MPa。其研究结果可为低压余热电站的优化设计与运行提供较为科学的依据。

The choice of a thermodynamic system and its steam parameters is the most important basic work for designing a waste heat power plant.With the dual pressure system in a sintering waste heat power plant in Jinan Iron and Steel Works serving as an example,established was a model for calculating a thermodynamic system and optimizing its steam pressures with a maximum net power output serving as the target function.In addition,a program was designed and the correctness of the model was verified through calculations.The main factors influencing the optimization of the main steam pressure were analyzed,and the law governing the change of net power output with the main steam pressure was studied.The research results show that the optimum main steam pressure of a case calculation is 2.2 MPa,0.14 MPa higher than the main steam design pressure of the power plant.The research findings can offer a relatively scientific basis for the optimized design and operation of low pressure waste heat power plants.