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W-shaped flame boiler gap type OFA (over fire air) device arranged above arch wing wall

A gap-type, burn-out air technology, applied in the direction of combustion methods, combustion equipment, non-flammable liquid/gas transportation, etc., can solve the problem of high content of combustibles in NOx emission fly ash, not all four-corner burners can be put into operation, water-cooled wall To prevent tearing and other problems, to achieve the effect of preventing water wall tearing, reducing fly ash combustible content, and uniform heat load

Active Publication Date: 2015-04-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a W-shaped flame boiler gap-type burn-off air device arranged above the wing wall of the arch, in order to solve the problem that the W-flame boiler increases the burn-off air and reduces NOx emissions while causing the fly ash combustible content comparison High, the four-corner burners cannot be fully put into operation, and the water-cooled walls on the side walls and wing walls are overheated, and even the water-cooled walls in this area are torn.

Method used

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  • W-shaped flame boiler gap type OFA (over fire air) device arranged above arch wing wall
  • W-shaped flame boiler gap type OFA (over fire air) device arranged above arch wing wall
  • W-shaped flame boiler gap type OFA (over fire air) device arranged above arch wing wall

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specific Embodiment approach 1

[0009] Specific implementation mode one: combine Figure 1-Figure 3 Describe this embodiment, the W-shaped flame boiler of this embodiment includes a furnace body composed of a lower furnace body 11, an upper furnace body 12 and two furnace arches 13, a plurality of primary air nozzles 4, a plurality of exhaust gas nozzles 2, a plurality of A secondary air nozzle 3, a plurality of slit-type arched burn-off air nozzles 6 and two main burner bellows 10, the lower furnace body 11 is composed of a front wall 14, a rear wall 15, two side walls 16 and four wing walls 17, a plurality of secondary air nozzles 3 are divided into two groups, two groups of secondary air nozzles 3 are symmetrically arranged along the center line of the furnace body, and a group of secondary air nozzles are arranged in parallel on each furnace arch 13 along its length direction 3. A plurality of secondary air nozzles 3 are all connected to the lower furnace of the lower furnace body 11. Two adjacent second...

specific Embodiment approach 2

[0010] Specific implementation mode two: combination figure 2 Describe this embodiment, the cross section of the slot-type wing wall overburning air nozzle 7 of this embodiment is a rectangle with an aspect ratio of (5-7):1. Other implementation manners are the same as the specific implementation manner 1.

specific Embodiment approach 3

[0011] Specific implementation mode three: combination figure 1 Describe this embodiment, the distance between the overburning air nozzle 6 on the slit arch and the corresponding primary air nozzle 4 in this embodiment is 1-2m, the advantage of this structure is that the distance between the overburning air and the primary air is relatively long, It will not be mixed with the primary air from the downward injection, so as to ensure the staged combustion and reduce NOx. At the same time, the exhaust air is fed into the lower furnace to ensure the oxygen required for the combustion of pulverized coal and promote the combustion of pulverized coal. Other implementation manners are the same as the specific implementation manner 1.

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Abstract

The invention discloses a W-shaped flame boiler gap type OFA (over fire air) device arranged above an arch wing wall and relates to a boiler OFA device. The device solves the problems of a W-shaped flame boiler that in the case that OFA is increased and the NOX discharge is reduced, the flying ash is caused and the content of combustible matter is high, not all burners at four corners can be put into operation and the wall surfaces of water-cooling walls at beside the a side wall and wing walls are over-temperature, and even the water cooling walls in the region are torn. Each wing wall is provided with a group of gap type wing wall OFA nozzles, each group of gap type wing wall after combustion air nozzles is correspondingly provided with a wing wall OFA box, and each group of gap type arch OFA nozzles is correspondingly provided with an arch OFA box; and an air outlet of a fan is communicated with one end of a secondary air pipe, the other end of the secondary air pipe sequentially passes through a main burner air box, and the side wall of the secondary air pipe is respectively communicated with the arch OFA boxes and wing wall OFA boxes through a plurality of guiding pipes. The W-shaped flame boiler gap type OFA device provided by the invention is used for a W-shaped flame boiler.

Description

technical field [0001] The invention relates to a boiler exhaust air device. Background technique [0002] W-type flame boiler is the main type of furnace for burning low-quality bituminous coal and anthracite in my country. At present, the total installed capacity in China is about 41000MW. However, due to the high temperature of the lower furnace of the W-type flame boiler, NO x The emission level is obviously high. The NOx emission of W-type flame boilers currently in service in China is mostly 1000mg / m 3 (6% off 2 ) above, which has caused serious pollution to the environment. According to my country's latest "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), which was implemented on July 1, 2014, the maximum allowable NOx emission concentration of W-type flame boilers is 200mg / m 3 (6% off 2 ), so while performing tail denitrification, the W-type flame boiler must also organize low NOx combustion in the furnace. [0003] Adding a burn-of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C7/00F23L9/00
Inventor 李争起况敏刘春龙井新经曾令艳陈智超朱群益
Owner HARBIN INST OF TECH
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