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

A technology of burning out wind and flame, which is applied in the transportation of non-combustible liquid/gas, combustion method, combustion equipment, etc. The effect of reducing the content of combustibles in fly ash and facilitating burnout

Inactive Publication Date: 2009-07-08
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 implementation manner one: such as Figure 1~3 As shown, the W-shaped flame boiler with two-stage over-fire air described in this embodiment includes an upper furnace body 12, a lower furnace body 13, a furnace arch 5, a cyclone separator 7, a burner 8, and an oil secondary air pipe. 9. The secondary air box 11 and the upper OFA nozzle 2; the upper furnace body 12 communicates with the lower furnace body 13 through the furnace arch 5, the burner 8 and the oil secondary air pipe 9 are 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, the other end of the cyclone separator 7 communicates with the oil secondary air pipe 9, and the upper side wall of the cyclone separator 7 is provided with The original exhaust gas duct installation port 10 is provided with an upper-level OFA nozzle 2 on the side wall of the upper furnace body 12 and communica...

specific Embodiment approach 2

[0014] Specific implementation manner two: such as Figure 1~3 As shown, the included angle β between the center line of the lower-level OFA nozzle 4 and the horizontal line in this embodiment is 0°-5°. If the β angle is too large, the confluence point of the lower overburning wind and the upstream primary and exhaust air will decrease, the range of area I will be reduced, and the range of area II will be correspondingly expanded. The reducing atmosphere of the primary and exhausted air in area I The intermediate residence time is reduced, and the amount of fuel-based NOx generated increases. β of 0°~5° can reduce fuel NO x Increase in production. Other components and connection relationships are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Specific implementation manner three: such as Figure 1~3 As shown, the W-shaped flame boiler in this embodiment further includes a lower-level OFA nozzle baffle 3, and the lower-level OFA nozzle baffle 3 is disposed on the lower OFA nozzle 4. The lower-level OFA nozzle baffle 3 is used to control the air volume of the lower-level overfire air entering the furnace. Other components and connection relationships are the same as those in the first or second embodiment.

[0016] working principle:

[0017]The present invention adopts two-stage OFA device (upper OFA nozzle 2 and lower OFA nozzle 4), and part of the secondary air (accounting for 25-30% of the total air volume) provided by the secondary air box 11 is separated from the upper OFA nozzle 2 and the lower OFA nozzle 4 is sprayed into the furnace, where the upper-level OFA nozzle 2 sprays 15% of the total air volume, and the lower-level OFA nozzle 4 sprays 10-15% of the total air volume, and the amount of air entering t...

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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-flame combustion technology is a combustion technology specially designed for burning low-volatile coal such as anthracite. W-flame boilers represented by American FW Company have achieved satisfactory results in many countries. This type of furnace has taken effective measures in terms of ignition, stable combustion, and burnout. The efficiency of the anthracite boiler can reach more than 90%, the minimum load of oil-free combustion can reach about 40%, and the combustible volatile content is V daf = 4% of anthracite. W-type flame combustion technology promotes the burning of pulverized coal by extending 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] Over-fired air (OFA) technology ...

Claims

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Application Information

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Patent Type & Authority Applications(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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