Odd-number cycle ignition high-efficiency energy-saving ultra-low NOx gas burner

Abstract

The invention discloses an odd-number circulating ignition high-efficiency energy-saving ultra-low NOx gas burner, include a cylinder, A brazier brick is arranged in the cylinder body, Gas guns and their annular drum assemblies and permanent lamps, A guide tube is arranged in the brazier, A low end face of that barrel body is fixedly connected with a ventilation valve, The inlet of combustion supporting air on the side of the air regulating valve is welded and connected with a square pipe, the square pipe is connected with the air duct of the heating furnace air supply system through a flangesub-joint, and the inner wall of the brazier is divided into four sections, namely, a conical section retraction section, a straight section, a conical section expansion section and an upper groove section, wherein the upper groove section is provided with a plurality of square grooves, and a reserved circular hole is arranged below the groove section. The burner realizes two-stage fuel gas stagedcombustion, one-stage fuel cycle ignition, reliable ignition, combustion homogeneity and stability. The combustion process of two-stage flame can control flame temperature by changing injection speed, injection angle and nozzle hole size reasonably, so as to achieve the purpose of ultra-low NOx combustion emission.

Description

technical field [0001] The invention relates to the technical field of petrochemical heating furnaces and boiler burners, in particular to an odd-number cycle ignition with high efficiency, energy saving and ultra-low NO X gas burner. Background technique [0002] Various types of gas burners developed in recent years all use low NO X Combustion technology, since various manufacturers are applying low NO X Combustion inhibition NO X The focus on technology is different, the structure of the burner is also different, and the effect of use is also very different. Especially in the application of technologies such as non-equivalent combustion, fuel classification, and flue gas recirculation combustion, due to the influence of low furnace temperature and low burner load, when the flame temperature control is low, the burner flame temperature field is not stable. The problem of uniformity leads to part of the fuel not being ignited and burned in the designed combustion area, ...

AI Technical Summary

Problems solved by technology

Especially in the application of technologies such as non-equivalent combustion, fuel classification, and flue gas recirculation combustion, due to the influence of low furnace temperature and low burner load, when the flame temperature control is low, the burner flame temperature field is not stable. The problem of uniformity leads to part of the fuel not being ignited and burned in the designed combustion area, or the subsequent bias flow of the process product CO in the oxygen-lean combustion process does not obtain oxygen in time, resulting in some combustibles escaping from the furnace, forming secondary combustion or direct combustion. Discharged with flue gas, causing safety risks of decreased combustion efficiency and unstable furnace pressure

[0003] Petrochemical heating furnace burners require an operating ratio of 5:1 for gas burners. According to the requirements of the process, the operating load adjustment range of the burner is large, and low-load operation is common. Therefore, there are more efficiency drops mentioned above. problem, which has attracted more and more attention

Analyzing these burners that have problems in low-temperature furnaces and small loads, it is found that most of them are related to the way of stabilizing the flame of each air gun of the burner, and the improper distribution ratio of fuel for stabilizing the flame. For the burner of the gun, when the load is small, the injection speed of the secondary gas of the outer gun is very low, and it is difficult to inject it into the center of the brazier and mix with the oxygen-containing flue gas after the primary combustion, so the problem of insufficient combustion occurs

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