High-stability, short-flame, low-NOx and low-CO combustor

Abstract

The invention relates to a high-stability, short-flame, low-NOx and low-CO combustor. The combustor comprises a refractory brick, a Y-shaped air gun, a shell, a gas collecting tube, an air inlet and athroat plate, wherein the refractory brick is fixedly arranged at the top of the shell, and comprises a first refractory brick and a second refractory brick, the inclined plane of the first refractory brick is an inclined plane with a large dip angle, the inclined plane of the second refractory brick is the inclined plane with a small dip angle, the first refractory brick comprises a flame stabilizing ring in a shape like a Chinese character 'AO' (meaning concave in English), flame stabilizing holes which are vertical to each other are formed in the first refractory brick, radial smoke refluxholes are formed in the second refractory brick, the Y-shaped air gun is arranged in the refractory brick, and is fixedly arranged at the bottom of the shell, a primary nozzle and a secondary nozzleare arranged at the head of the Y-shaped air gun, the bottom of the Y-shaped air gun is connected with the gas collecting tube, the throat plate is arranged at a central position in the refractory brick, and the throat plate is coaxially arranged together with the refractory brick and the shell. The high-stability, short-flame, low-NOx and low-CO combustor provided by the invention is high in combustion stability and short in flame length.

Description

technical field [0001] The invention relates to a burner, in particular to a low NOx and CO burner with high stability and short flame, belonging to the technical field of combustion equipment. Background technique [0002] The pollution of nitrogen oxides to the environment has become an increasingly serious global problem. Its main impact on the atmosphere is acid rain, and it also participates in the formation of floating dust in the air. NOx is a general term for oxides, and nitrogen oxides are one of the important pollutants in the atmosphere, including N 2 O, NO, N 2 o 2 , N 2 o 3 , NO 2 , N 2 o 4 and N 2 o 5 Among them, the main pollutants to the atmosphere are NO and NO 2 . More than 90% of the NOx initially generated during fuel combustion is NO, but NO can easily react with oxygen in the air in the atmosphere to form NO 2 , so NOx in the atmosphere is generally expressed as NO 2 form exists. Under UV light irradiation, NO 2 It will interact with carb...

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Problems solved by technology

[0005] Existing burners usually account for 10%-20% of the primary fuel, but because of the small proportion of primary fuel, under certain working conditions, such as high fuel gas pressure or high air excess coefficient, it is very easy to Unstable combustion, even misfire, especially in low-load operation; due to the reduction of primary fuel, the increase of secondary fuel, and the addition of oxygen-poor flue gas, the flame length of the low NOx burner is significantly longer than that of Traditional non-low NOx burners, about 1.5 times the flame length of traditional non-low NOx burners, when the furnace temperature is lower than 650 ° C, the CO emission concentration often exceeds the standard, due to the increase in flame length, some heating furnaces with lower furnace heights The top temperature of the furnace is obviously high, and the heat absorption of the radiant section decreases, resulting in a decrease in furnace efficiency; because the furnace temperature is relatively low and the load is small, the power of fuel gas injection is reduced and the mixing of fuel gas and air becomes poor. At this time, it is very easy Produce a large amount of CO, causing its emission to exceed the standard

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