[Objectives]Deep peak regulation of coal-fired boilers is crucial to the stability of the future power system dominated by new energy,but there is a lack of performance and engineering applications on deep peak regulation of 1 000 MW ultra-supercritical coal-fired boilers.In order to improve the deep peak regulation capacity of 1 000 MW coal-fired boilers,a 1 000 MW coal-fired unit of a power plant is selected to carry out a wide-load high-efficiency research.[Methods]Focusing on the unit load depth peak regulation load of 340 MW,the low-load stable combustion experiment and the denitrification side inlet flue gas test were carried out.In addition,the main operating parameters of the boiler,the temperature distribution of the furnace and the combustion adjustment test on the boiler side were analyzed.The combustion optimization adjustment experiment was carried out on this basis.[Results]1 000 MW unit has a deep peak regulation capacity of 34%rated power.The flue gas temperatures of selective catalytic reduction(SCR)denitrification inlet are basically 320-350℃,which meet the flue gas temperature requirements higher than 300℃.After the optimization and adjustment of the boiler,the modified thermal efficiency of the boiler is 94.09%(increased by 0.94%),and the coal consumption for power supply is reduced by 3.27 g/(kW⋅h).The NOx at the inlet of SCR denitrification is basically 180-260 mg/m3(decreased by about 30 mg/m3),and meet the requirements of less than 300 mg/m3.[Conclusions]The research results are helpful to improve the safety,economy and environmental properties of low-load operation of 1 000 MW coal-fired thermal power units.
coal-fired power generationcoal-fired boilerdeep peak regualtionlow loadstable combustion experimentcombustion optimization adjustultra-supercritical unit
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