An ultra-low load stable combustion preheating and decomposing combustion system and ultra-low load operation method

Abstract

The invention discloses an ultra-low-load stable combustion pre-pyrolysis combustion system and an ultra-low-load operation method, including a coal mill, an air box, a first powder feeding pipeline, a direct current burner, a powder feeding pipeline reversing valve, and a secondary air adjustment Valve, preheating and deswirling burner, boiler furnace, secondary air duct and main burner; the center height of the nozzle of the preheating and deswirling burner is the same as the height of the nozzle of the direct-flow burner on the floor; the coal mill passes through the first The powder feeding pipeline is connected to the direct-flow burner and the preheating deswirl burner, the preheating deswirl burner is installed on the front and rear walls of the boiler furnace, and the air box is arranged on the side adjacent to the boiler furnace where the preheating deswirl burner is installed On the wall, the air box is connected with the direct-flow burner and the preheating solution swirl burner; it can make the pulverized coal undergo low-temperature pyrolysis in the pre-combustion chamber of the preheating solution swirl burner, and the pyrolysis product is mixed with the external secondary air, and then Spray into the boiler furnace for stable combustion, ensure the stable operation of the boiler under ultra-low load, and meet the needs of deep peak regulation.

Description

technical field [0001] The invention belongs to the field of boiler combustion, and in particular relates to an ultra-low-load stable combustion pre-pyrolysis combustion system and an ultra-low-load operation method. Background technique [0002] With the deterioration of the ecological environment, the pace of global carbon dioxide emission reduction is accelerating, and the energy structure will change. In recent years, low-carbon new energy represented by wind energy and solar energy has developed rapidly, and large-scale wind and solar energy have been connected to the grid. However, these power sources have strong randomness, energy production is intermittent, and cannot be adjusted according to the needs of the grid. characteristics, which pose a great challenge to the security and stability of the power grid. According to analysis, after the proportion of wind power and photovoltaics in the power system reaches a certain percentage of 15%-20%, every percentage point ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the prior art, the present invention provides an ultra-low-load stable combustion pre-pyrolysis combustion system and an ultra-low-load operation method. By installing pre-pyrolysis swirl burners on the front and rear walls of the boiler furnace, Solve the problem that the pulverized coal is ignited in the pre-combustion chamber of the swirl burner, resulting in high nitrogen oxide emissions and easy slagging, and the problem that the once-through burner cannot operate stably under ultra-low load

Images