High-temperature pure oxygen oil gun device for utility boiler automatic stable combustion

Abstract

The invention relates to a high-temperature pure oxygen oil gun device for utility boiler automatic stable combustion. The high-temperature pure oxygen oil gun device comprises a water wall pipe, a high-temperature pure oxygen oil gun assembly, a pulverized coal burner, a hot air box, an oxygen heater, an oxygen mother pipe and an oxygen pipeline. The pulverized coal burner is installed on the hot air box, a hole is formed between the water wall pipe and the pulverized coal burner, the high-temperature pure oxygen oil gun assembly is connected with the water wall pipe and the pulverized coal burner in the mode that the bottom of the high-temperature pure oxygen oil gun assembly is arranged into the hole in a sleeved mode, the high-temperature pure oxygen oil gun assembly is connected with the oxygen mother pipe through the oxygen pipeline, the oxygen mother pipe is connected with the oxygen heater, and the top of the oxygen heater is open. According to the high-temperature pure oxygen oil gun device for utility boiler automatic stable combustion, high-temperature pure oxygen is utilized for combustion supporting for fuel oil, white flame at the temperature higher than 2000 DEG C is obtained, oxygen is heated further through the high-temperature flame, the oxygen temperature can reach or exceed the temperature needed by pulverized coal ignition, finally, pulverized coal is ignited by high-temperature oxygen-enriched oil flame, and the excellent stable combustion effect is achieved.

Description

technical field [0001] The invention relates to a high-temperature pure oxygen oil gun device used for automatic stable combustion of power plant boilers. Background technique [0002] Power plant boilers often operate below the minimum load for a long time during deep peak regulation, and need to use oil guns to support combustion. At the same time, with the increasingly tense energy situation at home and abroad, power plant boilers cannot guarantee that the designed coal type is consistent with the actual coal type, resulting in poor combustion of the boiler. When it is stable, it is also necessary to inject oil to support the combustion. Therefore, the phenomenon that the current power plant boilers consume a lot of oil for stable combustion has caused a heavy economic burden to users. According to statistics, a 600MW boiler of this type averages about 400 tons of oil per year for stable combustion. [0003] In response to this situation, my country has developed various...

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Problems solved by technology

[0004] The oil-free and stable combustion technology represented by plasma ignition and high-temperature air ignition technology has many patents, such as a plasma ignition device (CN1230659) for directly igniting pulverized coal boilers in power plants, a plasma ignition combustion device (CN201106846), a power plant AC plasma ignition device for coal-fired boiler (CN202048592U), high-temperature air ignition device for pulverized coal boiler (CN2591434), etc. This type of technology transforms the pulverized coal burner in the lower layer of the boiler into an ignition burner, and at the same time, enables the modified burner to realize Oil-free and stable combustion, but this type of burner is mainly designed to save oil in the cold state of the boiler, and its low-nitrogen combustion performance is poor, so this technology can only be applied to the bottom layer of the boiler (or the bottom two layers) ) of the burner, while the rest of the burners still need oil to stabilize combustion under low load or emergency conditions, and the cost of this type of transformation is very expensive

[0005] Combustion stabilization technology represented by burner structure transformation, has many patents in this area, such as high-efficiency, low nitrogen oxides, strong and stable combustion pulverized coal main burner with double primary air channels (CN1059022A), thick-lean combined pulverized coal burner (CN1239763 ), a wedge-shaped blunt body combustion device 9CN1046795) and so on, this type of technology has improved the low-load performance of the boiler to varying degrees, but at the same time there are certain limitations, mainly because there is a requirement for a minimum stable combustion load in this type of technology , when it is lower than the respective minimum stable combustion load, the stable combustion of pulverized coal cannot be ensured, and a large oil gun is still needed, so this type of technology is not a real oil-free stable combustion technology;

[0006] The technology of using oxygen for combustion support mainly has two forms at present. The first form is to ignite pulverized coal with micro-oil. The patent in this respect includes an oxygen-enriched ignition and low-load stable combustion pulverized coal burner (CN102418922A), external Combustion-type oxygen-enriched ignition and ultra-low load stable combustion pulverized coal burner (CN101418952), the second is that oxygen directly ignites pulverized coal, and the patents in this area include oxygen-enriched oil-free ignition and stable combustion device (CN1818476A), a dense phase High-temperature oxygen-enriched oil-free ignition and stable combustion device (101424398A); the patented technologies of these two aspects need to modify the structure of the burner, so they can only be applied to the cold-state ignition of the boiler, and cannot realize the realization of all burners in the entire furnace. Oil-free and stable combustion

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