Pulverized coal burner of grading ignition preburning chamber and burning method

A pulverized coal burner and pre-combustion chamber technology, which is applied in the direction of combustion methods, burners for burning powder fuel, burners, etc., can solve the problems of coking and burning in the pre-combustion chamber, low-load stable combustion, etc. The effect of rapid and stable ignition and large velocity gradient

Pending Publication Date: 2018-11-06
徐州燃烧控制研究院有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem: The purpose of this invention is to overcome the deficiencies in the prior art and provide a staged ignition pre-combustion chamber pulverized coal burner, which introduces the extraction theory of the air extractor and the staged ignition theory into the blunt body stable combustion Jolywood created the honeycomb large speed difference theory to solve the current problems of coking and burning in the pre-combustion chamber and low-load stable combustion

Method used

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  • Pulverized coal burner of grading ignition preburning chamber and burning method
  • Pulverized coal burner of grading ignition preburning chamber and burning method
  • Pulverized coal burner of grading ignition preburning chamber and burning method

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Embodiment 1

[0039] Embodiment one, as figure 1 As shown, it is mainly composed of blunt body 1 and 4-stage air nozzles that constitute the graded ignition pre-combustion chamber. The 4-stage air nozzles include: primary air nozzle 2, inner secondary air nozzle 3, and middle secondary air nozzle 4 and the outer secondary air nozzle 5; the central blunt body 1, the primary air nozzle 2, the inner secondary air nozzle 3, the middle secondary air nozzle 4 and the outer secondary air nozzle 5 are nested On the same axis, the primary air nozzle 2, the inner secondary air nozzle 3, the middle secondary air nozzle 4 and the outer secondary air nozzle 5 are all connected by a cylinder and a cone, and all the nozzles are connected step by step. Nested to form a 4-stage air distribution pre-combustion chamber, the primary air is direct current, the secondary air is swirling, and the secondary air nozzle is divided into inner secondary air, middle secondary air and outer secondary air; each stage of ...

Embodiment 2

[0041] Embodiment 2 is mainly composed of honeycomb blunt body 11 and 4-stage air nozzles forming a staged ignition pre-combustion chamber, which is basically the same as Embodiment 1, and the similarities are omitted. The difference is as figure 2 As shown, the honeycomb blunt body 11 is installed inside the primary air nozzle 2, and the distance between the right end face of the honeycomb blunt body and the primary air outlet is P=0-400mm, preferably 50-300mm; the figure of this embodiment omits the ignition oil gun Or an ignition air gun or a plasma gun, and an ignition oil gun or an ignition air gun or a plasma gun is placed in the central hole of the honeycomb blunt body. The detailed diagram of the honeycomb blunt body 11 is shown in Figure 3. There are 5-50 shrinking nozzles on the honeycomb blunt body, preferably 8-36, and the shrinkage angle θ of the shrinking nozzles is 0-120 degrees, preferably 40-60 degrees ; Aperture d of the shrinking nozzle = 10-30 mm, prefera...

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Abstract

The invention discloses a pulverized coal burner of a grading ignition preburning chamber and a burning method. The burner comprises a center bluff body, and multistage air spraying pipes for formingthe grading ignition preburning chamber; the center bluff body and multistage secondary air spraying pipes are engaged to sleeve the same axis; the secondary air spraying pipes are engaged step by step to form multistage air distribution preburning chambers for direct flowing of primary air and cyclone flowing of multistage secondary air; air distribution outlets of each stage of preburning chamber and air distribution outlets of the next stage of preburning chamber are arranged at intervals; flame is wrapped in middle; and secondary air from the next stage is used as previous stage of wall air film cooling air. The problems of coking burning loss and low-load stable combustion of a traditional preburning chamber are solved. The lowest stable combustion load can be reduced to 10%; the unburned carbon in flue dust under low load is still lower; the power of an ignition air gun is only 3% of the rated power of the burner; the working time is only about 3 minutes; and the adapted coal types are wider. The burner is simple in structure, convenient to operate and excellent in use effect.

Description

technical field [0001] The invention relates to a pulverized coal burner and a combustion method, in particular to a pulverized coal burner and a combustion method in a staged ignition precombustion chamber suitable for power plant boilers, cement kilns and industrial pulverized coal furnaces. Background technique [0002] Pulverized coal is widely used in power plant boilers, cement kilns and industrial pulverized coal furnaces. Although pulverized coal is similar to fluids like oil and gas for easy transportation, it is usually called pneumatic transportation, but for pulverized coal furnaces with dilute phase transportation , Low-load stable combustion has always been a problem. In the past 10 years, there have been more and more storage-type industrial pulverized coal boilers, and the load changes are more frequent and larger than the previous power plant boilers. For power plant pulverized coal boilers, the minimum steady combustion load without oil input is generally 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/00
CPCF23D1/00
Inventor 雍占锋宋方真常春梅李亮陆羽程怀志
Owner 徐州燃烧控制研究院有限公司
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