At this stage, my country is facing a relatively severe air pollution situation. In order to alleviate environmental pressure, my country's flue gas emission standards for coal and electricity have become stricter. Most existing traditional technologies have the contradiction of high standard environmental protection requirements and high energy consumption. This project is an independent innovation project carried out relying on two 1000MW ultra-supercritical units of Shanghai Waigaoqiao Third Power Generation Co., Ltd. It has developed a series of technologies that are both energy-saving and environmentally friendly, reducing energy consumption of thermal power units and reducing pollutants. Emissions, this is the best way to fundamentally solve the current severe environmental situation in my country.
This project innovates the regenerative theory of the thermodynamic cycle and proposes the "generalized regenerative theory", which breaks through the traditional classic regenerative cycle using boiler feed water as a single regenerative medium, and expands it to a generalized regenerative cycle using water, wind, coal, etc. input from the boiler. Based on the "Generalized Regeneration Theory", a series of generalized regeneration technologies have been developed, covering "adjustable feed water constant temperature regeneration technology-regenerative extraction steam supplementary heating of boiler feed water","air supply regenerative technology-regenerative extraction steam heating boiler inlet","powder feeding regenerative technology-regenerative extraction steam heating boiler powder feeding","energy-saving catalyst life extension and efficiency maintenance technology-adjacent machine extraction steam regenerative start-up series technology." This generalized regenerative series technology not only opens up the bottleneck of improving efficiency of thermal power plants, solves many problems such as hydrodynamic power and stable combustion under low load of boilers, but also solves the three world-wide problems of "low load denitrification devices" common in denitrification (SCR) devices: "Exit from operation","blockage and corrosion in the cold section of the air preheater", and "rapid decline in catalyst activity".
This project has 5 authorized utility model patents including "An Adjustable Feedwater Reheating System for Turbogenerator Units", 3 invention patents have been accepted, and 2 papers have been published in academic journals and conferences at home and abroad. Published.
After this project is applied to three and two external units, it is estimated that the total coal consumption of the unit can be reduced by about 5.85g/kWh. The annual standard coal saving is 64100 tons, resulting in emission reductions of CO2, SO2 and NOx by 170,000 tons/year, 4487 tons/year, and 448.7 tons/year.
At the same time, due to the application of "generalized regenerative series technology", the SCR denitrification system can operate around the clock, which has greatly improved the environmental performance of the unit. In 2011, the annual investment rate of the external tertiary denitrification system reached 98.54%(if the maintenance period is not included, it is 100%), truly realizing all-weather denitrification. According to statistics from the Shanghai City Environmental Protection Bureau, the annual NOx emission reduction of only one unit in Waishan exceeds that of two similar units in Shanghai.
The application of this technology can also greatly reduce the production cost of power plants, for example, extend the life of the denitrification catalyst and save catalyst replacement costs; avoid the problem of air preheater clogging and save air preheater cleaning costs; improve the adaptability range of coal types, and create technical conditions for mixing and burning low-quality coal to save coal costs.
The research results of this project are general technology and can be widely used in the technical transformation of new units and old units with various capacities and parameters. This project will promote the development of my country's low-carbon, environmentally friendly economic technologies, and have a strong radiating and driving effect on energy conservation and emission reduction in the thermal power industry. It will also improve the level and international competitiveness of my country's power generation technology field, and contribute to the leapfrog development of my country's power industry.