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W-shaped flame boiler with two-stage over-fire wind

A burn-out wind and flame technology, applied in the transportation of non-combustible liquid/gas, combustion methods, combustion equipment, etc., can solve the problems of low burn-out rate of pulverized coal and high content of fly ash combustibles, and achieve graded combustion, The content of combustibles in fly ash is reduced, which is beneficial to the effect of burnout

Inactive Publication Date: 2010-08-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high content of fly ash combustibles and low burnout rate of pulverized coal in the existing W-type flame boiler with single-stage overfire air device, the present invention provides a W-type flame boiler with two-stage overfire air

Method used

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  • W-shaped flame boiler with two-stage over-fire wind
  • W-shaped flame boiler with two-stage over-fire wind
  • W-shaped flame boiler with two-stage over-fire wind

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specific Embodiment approach 1

[0013] Specific Embodiment 1: As shown in Figures 1 to 3, the W-shaped flame boiler with two-stage overfire air described in this embodiment includes an upper furnace body 12, a lower furnace body 13, a furnace arch 5, and a cyclone separator 7 , burner 8, oil secondary air duct 9, secondary air box 11 and superior OFA spout 2; upper furnace body 12 communicates with lower furnace body 13 through furnace arch 5, and said burner 8 and oil secondary air duct 9 are all Vertically installed on the furnace arch 5 and the burner 8 is close to the center side of the lower furnace 6. The burner 8 communicates with one end of the cyclone separator 7, and the other end of the cyclone separator 7 communicates with the oil secondary air pipe 9. The upper side wall of the separator 7 is provided with the original exhaust air duct installation port 10, and the upper OFA nozzle 2 is arranged on the side wall of the upper furnace body 12 and communicated with the upper furnace 1, and the secon...

specific Embodiment approach 2

[0014] Embodiment 2: As shown in FIGS. 1-3 , the included angle β between the centerline of the lower OFA nozzle 4 in this embodiment and the horizontal line is 0°-5°. If the β angle is too large, the confluence point of the lower burn-off air and the upward primary air and exhaust air will decrease, the scope of area I will shrink, and the scope of area II will expand accordingly. The reducing atmosphere of primary air and exhaust air in area I Medium residence time reduction, fuel type NO x Generated increased. When β is 0°~5°, it can reduce fuel-type NO x increase in production. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0015] Specific embodiment three: As shown in Figures 1-3, the W-shaped flame boiler in this embodiment also includes a lower OFA nozzle baffle 3, and the lower OFA nozzle baffle 3 is arranged on the lower OFA nozzle 4. The lower-stage OFA nozzle baffle 3 is used to control the air volume of the lower-stage over-combustion air entering the furnace. Other compositions and connections are the same as those in Embodiment 1 or 2.

[0016] working principle:

[0017] The present invention adopts two-stage OFA devices (upper-level OFA nozzle 2 and lower-level OFA nozzle 4), and part of the secondary air (accounting for 25% to 30% of the total air volume) provided by the secondary wind box 11 flows from the upper-level OFA nozzle 2 and the lower-level OFA nozzle respectively. 4 is sprayed into the furnace, wherein the air volume injected into the upper-level OFA nozzle 2 is 15% of the total air volume, and the air volume injected into the lower-level OFA nozzle 4 is 10-15% of the to...

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Abstract

The invention discloses a W-shaped flame boiler with two stages of burn-out wind, which relates to the W-shaped flame boiler and aims at the problems that the W-shaped flame boiler of the prior single-stage burn-out wind device has high content of fly ash inflammable matters and low burn-off rate of coal dust. The W-shaped flame boiler comprises a superior OFA nozzle (2) and an inferior OFA nozzle (4) which is arranged on a furnace arch (5) close to an hearth throat inlet, is communicated with a lower hearth (6), is arranged on the outer side of a burner (8), and is communicated with a secondary wind box (11). The W-shaped flame boiler not only can replenish air for the unburned coal dust in time to benefit the burnout of the coal dust and greatly reduce the content of the fly ash inflammable matters, but also can better achieve the fractional combustion of the coal dust and greatly reduce the emission of NOx.

Description

technical field [0001] The invention relates to a W-shaped flame boiler. Background technique [0002] W-type flame combustion technology is a combustion technology specially designed for burning low volatile coal such as anthracite. The W-type flame boiler represented by the American FW company has achieved satisfactory results in many countries. This furnace type has adopted effective measures in terms of ignition, stable combustion and burnout. The efficiency of anthracite boilers can reach more than 90%, the minimum load of oil-free combustion can reach about 40%, and the combustible volatile matter content V daf = 4% anthracite. The W-shaped flame combustion technology promotes the burnout of coal powder by prolonging the flame stroke, that is, prolonging the residence time of pulverized coal particles in the furnace, and increasing the temperature of the combustion zone. This technology has been adopted by the boilers of some domestic power plants. [0003] Overfir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23L9/00
Inventor 陈智超李争起范夙博任枫杨学海
Owner HARBIN INST OF TECH
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