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.