Low-nitrogen swirling burner based on out-phase reduction of superfine pulverized coal and transformation method

A technology of swirl burner and fine coal powder, which is applied in the direction of combustion method, burner for burning powder fuel, burner, etc., can solve the problems of high price of natural gas, less application, and scarce quantity, and achieve the increase of NOx reduction efficiency, Effect of reducing fuel-type NOx and short internal diffusion distance

Pending Publication Date: 2019-08-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above-mentioned technologies for pulverized coal boilers to reduce NOx emissions, the air classification technology along the furnace height direction and various types of low NOx burners have been widely used and achieved certain control effects, but there is no technical breakthrough No further depth control of NOx generation possible
Flue gas recirculation technology is widely used in gas-fired boilers to control NOx generation, but due to the complexity of the system, it is rarely used in pulverized coal boilers
The combustion staging technology along the furnace height requires natural gas as a secondary fuel, but natural gas is expensive and scarce, and is not suitable for most coal-fired power plants

Method used

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  • Low-nitrogen swirling burner based on out-phase reduction of superfine pulverized coal and transformation method
  • Low-nitrogen swirling burner based on out-phase reduction of superfine pulverized coal and transformation method

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specific Embodiment approach 1

[0030] combine figure 1 , figure 2 , a low-nitrogen cyclone burner for heterogeneous reduction of ultra-fine pulverized coal in this embodiment, mainly consists of a central ultra-fine pulverized coal tube 1, a smooth anti-wear sleeve 5, a sleeve fixing device 6, and a tail leak-proof treatment device, etc. composition. A central ultra-fine pulverized coal pipe is installed in the axial central air duct of the swirl burner to transport ultra-fine coal powder into the furnace. Outer secondary air channel 4, and the central superfine pulverized coal pipe can adjust the relative position of the central superfine pulverized coal nozzle and the outlet of the primary air duct through the handwheel 7.

[0031] In this embodiment, the initial mark position of the handwheel rotation is recorded when the central superfine pulverized coal nozzle is flush with the outlet of the primary air duct. During the operation of the burner, the position of the central superfine pulverized coal p...

specific Embodiment approach 2

[0033] Specific implementation mode two: as Figure 1~2 As shown, this embodiment discloses a specific embodiment one, a modification method of a superfine pulverized coal heterogeneous reduction low-nitrogen swirl burner described in the specific embodiment, and the modification method includes the following steps:

[0034] Step 1: Weld the sleeve fixing device with wear-resistant material on the side of the existing swirl burner close to the furnace;

[0035] Step 2: Weld a smooth wear-resistant sleeve with an inner diameter larger than the outer diameter of the central ultra-fine pulverized coal pipe on the sleeve fixing device;

[0036] Step 3: Insert the central ultra-fine pulverized coal tube that has undergone anti-wear treatment into the swirl burner, and pass through the sleeve installed in step 2, and make a good connection between the central ultra-fine pulverized coal tube and the tail insertion area of ​​the swirl burner. Anti-leakage measures, and at the same ti...

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Abstract

The invention discloses a low-nitrogen swirling burner based on out-phase reduction of superfine pulverized coal and a transformation method, and belongs to power generating equipment of a thermal power plant. According to the low-nitrogen swirling burner based on out-phase reduction of the superfine pulverized coal and the transformation method, the low-nitrogen swirling burner based on out-phasereduction of the superfine pulverized coal mainly comprises a swirling burner body, a central superfine pulverized coal tube and other components; a specific mounting method of the swirling burner comprises steps as follows: a sleeve fixing device is welded; a sleeve is welded; the central superfine pulverized coal tube is inserted into the center of the burner; an adjusting hand wheel is mountedand the position is marked. The distance between the central superfine pulverized coal tube and an outlet of the burner can be directly adjusted by the hand wheel, and NOx produced when the pulverized coal is burnt by the swirling burner is controlled deeply, so that one transformation method of the low-nitrogen swirling burner is provided for realization of ultralow emission of a coal-fired power plant.

Description

technical field [0001] The invention relates to power generation equipment in a thermal power plant, in particular to a superfine pulverized coal heterogeneous reduction low-nitrogen swirl burner for a pulverized coal boiler and a transformation method thereof. Background technique [0002] Nitrogen oxides will not only harm the environment, cause natural disasters such as photochemical smog and acid rain, but also cause great damage to the human respiratory system and immune system. At this stage, coal-fired pulverized coal boilers in power plants generally have low-NOx combustion and emission control technologies. However, with my country's increasing environmental protection requirements, it is very necessary to further control the generation of NOx in the combustion process to reduce flue gas side denitrification. burden and achieve lower NOx emissions. [0003] Existing ways to control NOx produced by coal-fired power plants mainly include: air or fuel staged combustion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/02F23K3/02
CPCF23D1/02F23K3/02
Inventor 康志忠李建睿
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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