工业余热余能水蒸气循环发电系统热力方案优化

石化、冶金等流程工业存在大量不同品质、不同等级的余热余能,利用朗肯循环系统发电是企业提高能源效率、增加经济效益的主要方式之一。由于中小功率、中高参数等级汽轮机基本型式多样、通流部分热力设计多为非标准设计,所以循环热力系统需要进行详细的优化设计和技术经济比较才能获得最优效果。文章对相关方法和影响因素进行了论述和分析,并以某钢铁公司高炉煤气发电系统改造方案为例进行了比较说明,通过技术经济分析认为该公司旧的热力循环系统效率还有很大的提高空间,采用高温高压锅炉及同轴再热发电机组的方案能显著提高发电效率,最高可减少煤气耗量40%左右。

Petrochemical, metallurgical and other process industries have a large number of different quality, different levels of residual energy, the use of Rankine Cycle system to generate electricity is one of the main ways to improve energy efficiency and increase economic efficiency. Because the basic types of middle and small power and middle and high parameter steam turbines are various, and the thermodynamic design of flow passage is mostly nonstandard design, detailed optimization design and technical and economic comparison are needed to obtain the optimal effect of the cycle themlodynamic system. In this paper, the relative methods and influencing factors are discussed and analyzed, and the retrofit scheme of blast furnace gas power generation system in a certain iron and steel company is taken as an example to compare and explain. Through the technical and economic analysis, it is conclud ed that there is still much room for improvement of the efficiency of the old thermal cycle system of the company. The scheme of high temperature and high pressure boiler and coaxial reheat generator set can remarkably improve the power generation efficiency, and the maximum gas consumption can be reduced by about 40%.