The High Efficiency and Clean Combustion of Coal Based on Generalized Regeneration

Abstract

Continuous pressure of global warming and environmental pollutions pushes coal-fired power plants to develop in a more efficient and cleaner way. At present, the particular demands of Chinese grid for coal-fired power fleet, especially large peak-valley gaps, frequent start-ups, and shutdowns and cost pressures, bring the units especially the boilers more and tougher challenges, which result in the decline in combustion efficiency, frequent furnace explosions, the aggravation and collapse of slagging, and the burning of facilities in the downstream flue gas system of the boiler. In this paper, the innovative “generalized regeneration theory” and some typical techniques based on this theory are put forward and developed to provide new approach in more efficient, cleaner, and safer operation ways for coal-fired boilers. The packaged techniques, which include the new boiler start-up technique, the high-efficiency combustion and low emission technique under low load and the low oxygen, low NO x and high-efficiency combustion technique under high load, have been conducted successfully in the Shanghai Waigaoqiao No. 3 power plant. By improving the utilization of turbine extractions and reducing the exhaust loss, these innovative techniques greatly improve the efficiency, safety, environmental protection effect, and coal (especially high slagging tendency and moisture coal) adaptability of boilers in various operation conditions.