直接空冷机组最佳背压的试验研究  

Experimental Research on Optimum Back Pressure of Direct Air Cooling Unit

作　　者：文珏 薛康康 曹超 施宏波 郑楠 WEN Jue;XUE Kang-Kang;CAO Chao;无(China Datang Northwest Electric power test and Research Institute;School of Chemical Engineering and Technology)

机构地区：[1]中国大唐集团科学技术研究总院有限公司西北电力试验研究院 [2]西安交通大学化学工程与技术学院

出　　处：《电站系统工程》2024年第4期1-4,共4页Power System Engineering

基　　金：国家自然科学基金资助项目(52006163)资助。

摘　　要：优化背压对直接空冷机组的经济运行至关重要。以最佳背压为目标、空冷岛风机群频率为变量,根据单一变量原则和灰色关联度理论设计并实施现场试验,基于试验数据绘制风机频率-群功率、风机频率-背压及机组电功率-背压的特性曲线,最终获得风机群功率与机组电功率之间的协调变化趋势,从而得到最佳背压值。结果表明:风机群微增功率与风机群频率正相关;机组微增出力与风机群频率负相关;两曲线交点为最佳背压工况。负荷相似时,机组微增出力曲线随环境温度升高上移;环境温度相似时,机组微增出力曲线随负荷升高斜率变大;环境温度升高和负荷增大都会使交点右移,即达到最佳背压所需的风机群频率更高。Optimizing back pressure is critical to the economical operation of direct air cooling power plants.Taking the optimal back pressure as the goal and the frequency of the fans as the variable,the field test is designed and implemented according to the single variable principle and the grey relational theory,and the characteristic curve of the fan frequencyfan power,fan frequency-back pressure and unit electric power-back pressure can obtained.Finally,the coordinated change trend between the power of the fan group and the electric power of the unit is obtained,so as to obtain the optimal back pressure.The results show that micro-increase power of fans is positively correlated with the frequency of the fans;micro-increase output of unit is negatively correlated with the frequency of the fans;the intersection of the two curves is the optimal back pressure condition.When the load is similar,micro-increase output of unit curve moves upward with the increase of the ambient temperature;when the ambient temperature is similar,micro-increase power of fans curve has a larger slope with the increase of the load;both the increase of the ambient temperature and the load will move the intersection point to the right,that is,the rise of the fans frequency required to achieve optimum back pressure.

关 键 词：直接空冷 试验 最佳背压 风机群微增功率 机组微增出力 

分 类 号：TK264.11[动力工程及工程热物理—动力机械及工程]