Experimental Research On Deep Peak Regulation Ability Of 660MW Ultra Supercritical Thermal Power Unit

In the past ten years,with the rapid development of my country’s power industry and the transformation of my country’s economic situation.As the dominant thermal power plant in the conventional power industry,the proportion of installed capacity of thermal power plants is gradually decreasing,and the growth rate continues to decrease.The installed capacity of wind power,solar energy,solar thermal and other clean energy units continues to increase.However,with the increase in the capacity of clean energy machine assembly machines,the wind abandonment rate,light abandonment rate,and water abandonment rate continue to increase year by year.In order to further reduce the abandonment rate,wind abandonment rate,and water abandonment rate in the power grid,according to the current power structure in the power grid,at the same time,the power grid can operate safely and stably.That must require thermal power units,especially large-capacity units,to have deep peak regulation capabilities.That is to say,in the process of power grid peak adjustment,it is necessary to ensure that the load of the unit is reduced to below 50%,but also to ensure the safe and stable operation of the unit,which can receive full load at any time.The above requirements have brought many difficulties and dangers to coal-fired power plants,such as: boiler low-load combustion and unstable combustion,insufficient hydropower in the water wall,units may be turned to wet operation,environmental protection parameters cannot be controlled or even exceeded,auxiliary equipment The device exits for unilateral operation.The above-mentioned series of safety issues need to be resolved.Therefore,studying the flexibility of thermal power generation units for peak shaving has far-reaching significance for the future development of thermal power generation industry.The 660 MW ultra-supercritical unit of Xining Thermal Power has conducted related deep peak shaving tests in response to the national deep peak shaving policy and further improve the economic benefits of the deep peak shaving process.During the test,the relevant content of the unit’s low-load combustion was studied,and economic indicators such as unit efficiency were calculated and compared.At the same time,under the premise of meeting AGC and other detailed assessments,the lifting load test under the coordination mode is carried out.Through the test,the deep peak regulation capability of Xining Thermal Power’s660MW ultra-supercritical boiler unit was verified.The results show that the minimum stable combustion load test of the power plant’s 660 MW once-through boiler shows that the unit has a deep peak regulation capability after reasonable adjustments and interventions under the design coal type,and the minimum stable combustion load of the boiler is 30% BMCR can reach the design value of the boiler manufacturer.In order to improve the flexibility of coal-fired units,the author analyzed the actual operating parameters of domestic coal-fired power plants with the same capacity in variable load operation conditions,involving many aspects of the unit,and analyzed and studied the impact of coal-fired units.The various factors of economics in peak shaving have proposed an optimized solution for deep peak shaving of coal-fired power plants in actual production and operation,which provides strong technical support for the deep peak shaving operation and transformation of coal-fired power plants in my country.Through the research and analysis of the peak shaving scheme technology of coal-fired units,it provides reference and technical support for the maximum consumption of new energy in the power grid,saving non-renewable resources,and reducing pollutant emissions.