基于凝结水节流调节的供热机组快速变负荷性能研究

为了促进电网消纳波动性强的可再生能源电力,需要提升供热机组的快速变负荷性能。以汽水分布矩阵方程为基础建立供热机组凝结水节流快速变负荷的静态模型,计算凝结水节流方案的负荷变化比例;在除氧器安全运行前提下,计算凝结水节流方案的可持续时间;并以某350MW供热机组为例进行实例分析。结果表明:采用凝结水节流可有效提高供热机组负荷调节速率,且机组发电负荷越大,凝结水节流的变负荷性能越强;滑压运行时凝结水节流变负荷性能优于定压运行;增加供热抽汽流量会减弱凝结水节流变负荷性能。

Research on Rapid Load Change Performance of Heat Supply UnitsBased on Condensate Throttling

In order to promote the grid to absorb the greatly fluctuating renewable energy power,it is necessary to improve the rapid load changing capacity of the heat supply units.Based on the steam-water distribution matrix equation,the static model of rapid load change with condensate throttling for heat supply units was established,and the load change rate was calculated;on the premise of safe operation of deaerator,the duration of condensate throttling was calculated;and a 350MW heat supply unit was analyzed as an example.It is found that condensate throttling can effectively improve the load regulation rate of heat supply units,and with the increase of unit generation load,the regulation performance of condensate throttling is enhanced.It is also revealed that the condensate throttling performance in sliding pressure operating condition is better than that of constant pressure operating condition,and the load change performance of condensate throttling will be weakened by increasing the heating extraction steam flowrate.