燃煤电厂机组负荷变化与SCR系统参数的相关性分析

燃煤电厂机组负荷的变化与选择性催化还原（SCR）系统的各类参数（温度、含氧量、NO_x、SO₂/SO₃转化率）联系紧密，各参数数值直接影响机组的运行。针对3组燃煤电厂的5种工况（30%、50%、70%、80%、100%）的现场实测数据，采用相关分析法，对各类参数进行相关性分析。结果表明:与机组负荷呈正相关的参数为烟气温度和SO₂/SO₃转化率；呈负相关的参数为烟气含氧量和SCR出口NO_x浓度，但与SCR入口处NO_x浓度没有显著相关性。该结果可为避免锅炉在中低负荷下出现NO_x超标现象提供参考。

RESEARCH ON THE CORRELATION BETWEEN THE LOAD CHANGE OF COAL-FIRED POWER PLANT UNITS AND SCR SYSTEM PARAMETERS

The changes in the load of coal-fired power plant units are closely related to the various parameters of the selective catalytic reduction (SCR) system (temperature, oxygen content, nitrogen oxide concentration, SO₂/SO₃ conversion rate), and the level of each parameter directly affects the operation of the unit. In this paper, based on the field measurement data of 5 different working conditions (30%, 50%, 70%, 80%, 100%) of 3 groups of coal-fired power plants, the correlation analysis method was used to analyze the correlation of various parameters. The test results showed that the parameters that were positively correlated with the unit load were flue gas temperature and SO₂/SO₃ conversion rate; the parameters that were negatively correlated were the flue gas oxygen content and the SCR outlet nitrogen oxide concentration, but there was on significant correlation between the SCR inlet nitrogen oxide concentration and the unit load. It provided a reference for avoiding the phenomenon of no exceeding the standard under medium and low load.