A w-flame boiler with multiple sets of burn-off air nozzles

Abstract

The invention discloses a W-flame boiler with multiple groups of burnout air nozzles. A plurality of burnout air nozzle groups are arranged at the lower part of the upper furnace, and the multiple burnout air nozzle groups in each burnout air nozzle group are respectively arranged in The front wall and rear wall of the upper furnace, and the wind blown out by the multiple burn-up air vents in each burn-up air vent group forms an imaginary tangent circle in the center of the upper furnace; each burn-up air vent group The number of the plurality of burnout air vents is 3 or more. The W-flame boiler with multiple groups of burn-out air nozzles of the present invention can strengthen the mixing of the air in the upper furnace area with the unburned pulverized coal, enhance the filling degree of the flue gas in the upper furnace area, and improve the burn-out rate of the pulverized coal in the later stage. Reducing the carbon content and carbon monoxide content of fly ash, especially in the case of large deviation of the primary air powder of the boiler, can achieve the purpose of reducing the NOx emission of the boiler on the premise of ensuring the normal boiler steam-water parameters and the boiler thermal efficiency not reducing.

Description

technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a W-flame boiler with multiple sets of burn-off air nozzles. Background technique [0002] my country is a developing country that uses coal as its main energy source. Coal resources account for about 75% of my country's total energy production and consumption. During the combustion of coal, a large amount of pollutants will be produced, among which nitrogen oxides NOx are extremely harmful to the environment and difficult to deal with. With the improvement of environmental protection requirements, my country is paying more and more attention to the emission of NOx. The environmental protection department has revised the emission standards several times, and promulgated a new phase of "Emission Standards of Air Pollutants for Thermal Power Plants" in 2011 to strengthen thermal power plants. For the control of pollutant emissions, according to the new standard to be impl...

AI Technical Summary

Problems solved by technology

However, since most of the W-type flame boilers adopt the direct-blowing pulverization system, it is difficult to balance the air volume and powder volume of each primary air pulverized coal pipeline through adjustment. It is the late burnout that will have a greater impact, and the existing burnout air nozzle design and layout cannot change the occurrence of the above situation, which will further deteriorate the burnout of pulverized coal, resulting in the failure of the burnout air to be put into operation

Due to the wide furnace of the W-shaped flame boiler, the existing design and arrangement of the overburning air nozzle will also lead to uneven flue gas temperature along the width direction of the boiler, which will cause heat absorption deviation on the heating surface at the tail of the boiler, resulting in local wall temperature on the heating surface. The occurrence of over-temperature phenomenon affects the safe operation of the boiler

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