Centrally-fuel-fed swirl pulverized coal burner and over fire air arrangement structure

A technology of layout structure and swirl burner, which is applied in the direction of burners, burners, and combustion methods for burning powder fuel, can solve the problems of poor adaptability to variable loads, high emissions, and poor adaptability to coal types, etc. Large contact area, reduction of NOx generation, and enhanced reduction effect

Active Publication Date: 2018-01-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problems of high NOx emission, poor coal type adaptability and poor adaptability to variable loads of the existing indu

Method used

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  • Centrally-fuel-fed swirl pulverized coal burner and over fire air arrangement structure
  • Centrally-fuel-fed swirl pulverized coal burner and over fire air arrangement structure
  • Centrally-fuel-fed swirl pulverized coal burner and over fire air arrangement structure

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specific Embodiment approach 1

[0027] Specific implementation mode one: as Figure 1-6 As shown, the arrangement structure of the central powder feeding swirl pulverized coal burner and the overfire air in this embodiment includes a central powder feeding swirl burner, a primary overburning air nozzle group 4, and a plurality of secondary overburning air nozzles 5 , the primary overburning air regulating damper 4-1 and the secondary overburning air regulating damper 5-1; the center powder feeding swirl burner includes a primary air duct 1, an inner secondary air channel 2, an inner secondary air swirl Flow device 2-1, outer secondary air channel 3, outer secondary air cyclone 3-1; the primary air pipe 1 is set in the inner secondary air channel 2, and the inner secondary air channel 2 is set in the outer In the secondary air channel 3, the primary air duct 1, the inner secondary air channel 2 and the outer secondary air channel 3 are coaxially arranged, and the inner secondary air channel 2 is provided with...

specific Embodiment approach 2

[0029] Specific implementation mode two: as Figure 1~3 As shown, the radial distance from the axis of the thin jet tube of the primary overfire air nozzle 4 in this embodiment to the axis of the central powder feeding swirl burner is 300-1500mm. With such a design, the air for pulverized coal combustion is mixed in step by step to strengthen the staged combustion of air. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0030] Specific implementation mode three: as Figure 1~3 As shown, the radial distance from the axis of the secondary overburning air nozzle 5 to the axis of the primary overburning air nozzle 4 in this embodiment ranges from 1000 mm to 5000 mm. With such a design, the air for pulverized coal combustion is mixed in step by step, and the staged combustion of air is strengthened on the premise of improving the adaptability of coal types. Other compositions and connections are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a centrally-fuel-fed swirl pulverized coal burner and an over fire air arrangement structure, and relates to the pulverized coal burner and the over fire air arrangement structure. The centrally-fuel-fed swirl pulverized coal burner and the over fire air arrangement structure solve the problems that NOx emission amount is high and adaptability to the type of coal and adaptability to a variable load are poor in an existing industrial pulverized coal boiler. A primary air pipe, an inner secondary air channel and an outer secondary air channel are arranged coaxially, an inner secondary air swirler is arranged in the inner secondary air channel, and an outer secondary air swirler is arranged in the outer secondary air channel; a first-stage over fire air spray pipe setis composed of a plurality of jet flow thin pipes with the same diameters, and the jet flow thin pipes are uniformly distributed on the outer side of the centrally-fuel-fed swirl pulverized coal burner in the circumferential direction; second-stage over fire air nozzles are horizontally formed in the side wall of the upper part of a hearth; and first-stage over fire air adjusting dampers are arranged at air inlets of the jet flow thin pipes of the first-stage over fire air spray pipe set, and second-stage over fire air adjusting dampers are arranged at air inlets of the second-stage over fireair nozzles. The centrally-fuel-fed swirl pulverized coal burner and the over fire air arrangement structure are used for the industrial pulverized coal boiler.

Description

technical field [0001] The invention relates to an arrangement structure of a center-feeding swirling pulverized coal burner and an overfire air for an industrial pulverized coal boiler, and belongs to the technical field of pulverized coal combustion of industrial boilers. Background technique [0002] In my country, the number of coal-fired industrial boilers accounts for about 85% of industrial boilers, and the annual coal consumption is about 640 million tons. Due to the lack of better implementation plans and equipment, coal-fired industrial boilers have always had low efficiency and serious pollution. question. According to the statistics of relevant departments, the average annual operating efficiency of coal-fired industrial boilers in my country is only 60% to 65%, and the annual NOx emission is nearly 2 million tons, second only to coal-fired power generation boilers. [0003] In recent years, with the continuous maturity of pulverized coal combustion technology, t...

Claims

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Application Information

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IPC IPC(8): F23D1/02F23N3/06
Inventor 陈智超杨秀超高禄山严蓉曾令艳李争起
Owner HARBIN INST OF TECH
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