直接空冷机组经济背压计算模型及其应用

基于直接空冷机组的过程机理,建立了一个经济背压计算模型,分析了背压变化对发电机端功率和风机电耗的影响.以某300MW直接空冷机组为研究对象,借助所建模型计算了不同负荷下背压变化所产生的发电量收益,得到了经济背压随负荷的变化趋势.结果表明:直接空冷机组的经济背压随负荷升高而升高;不同负荷工况下,直接空冷机组运行在经济背压下的收益不同;在低负荷下运行时,优化背压参数,使其运行在经济背压下,所产生的发电量收益最为显著.

Oalculation Model for Economic Back Pressure of Direct Air-cooling Unit and Its Application

A calculation model for economic back-pressure of direct air-cooling unit was set up based on the process mechanism, so as to analyze the influence of back pressure change on the generator terminal power and fan power consumption. Taking a 300 MW direct air-cooling unit as the object of study, the power generation benefit resulted from back pressure variation was calculated with the model at different loads, after which the variation tendency of back pressure with load was obtained. Results show that the econom- ic back pressure of direct air-cooling unit increases with rising load; the power generation benefit obtained at economic back pressure varies with load; during low load operation, greatest power generation benefit will be produced when the back pressure parameters are optimized to make the unit work at the economic pressure.