Direct current low-nitrogen combustion device of coal water slurry boiler

Abstract

The invention discloses a direct current low-nitrogen combustion device of a coal water slurry boiler. The direct current low-nitrogen combustion device comprises device combustors which are arranged at the positions of four corners of a hearth, coal water slurry guns arranged on the device combustors, secondary air inlet devices, primary air inlet devices, and ignition air inlet devices, wherein the secondary air inlet devices and the primary air inlet devices are alternately arranged in the longitudinal direction of the device combustors at intervals. The ignition air inlet devices are arranged at the bottoms of the device combustors. The low-nitrogen combustion device further comprises over fire air separation combustor devices arranged on the tops of the device combustors. Each set of coal water slurry gun comprises the coal water slurry large slurry guns and the small coal water slurry small slurry gun located between the two vertically-adjacent coal water slurry large slurry guns, wherein the coal water slurry large slurry guns and the coal water slurry small slurry gun are arranged at the positions of air inlets of the primary air inlet devices. By the adoption of the designed low-nitrogen combustion device, the concentration of nitric oxide of flue gas of an outlet of the boiler can be smaller than 300 mg / m<3>, the boiler can meet the requirement for ultraclean discharging (smaller than or equal to 50 mg / m<3>, the consumption of ammonia injection is reduced, and the environment-friendliness effect and the economic benefits are obvious.

Description

technical field [0001] The invention relates to the technical field of boiler combustion equipment, in particular to a direct-flow low-nitrogen combustion device for a coal-water slurry boiler. Background technique [0002] Coal water slurry is a fluid fuel made of about 65% coal, about 34% water and about 1% chemical additives, which can be pumped, atomized and ignited. The calorific value is equivalent to half of that of fuel oil. Coal water slurry is a new type of coal-based slurry fuel that can replace oil for combustion. It has the outstanding advantages of low pollution, high efficiency, energy saving, and low operating cost. ". The State Environmental Protection Administration also proposed in the "Tenth Five-Year Plan for National Environmental Protection" to "vigorously develop coal-water slurry technology". The use of coal water slurry technology can not only improve the thermal efficiency of the boiler, but also reduce environmental pollution. Coal water slurr...

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Problems solved by technology

Under the current situation of severe boiler pollutant control, the existing coal-water slurry combustion method cannot effectively reduce the emission of nitrogen oxides and cannot meet the emission standards.

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