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W-firing boiler advanced denitration combustion method

A combustion method and boiler technology, applied in the direction of combustion method, combustion type, combustion equipment, etc., can solve problems such as limited scope of application, ammonia escape, high requirements for boiler working conditions, etc., achieve wide applicability, reduce emission values, reduce The effect of denitrification costs

Active Publication Date: 2016-12-21
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because it is arranged after the exhaust air, if too much ammonia is injected, it will also cause ammonia to escape, so the requirements for the working conditions of the boiler are relatively high, and the scope of application is limited

Method used

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  • W-firing boiler advanced denitration combustion method
  • W-firing boiler advanced denitration combustion method
  • W-firing boiler advanced denitration combustion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 , figure 2 , image 3 As shown, the W flame boiler has several burn-off air nozzles 4 on the upper part of the furnace front wall 7 and the rear wall 8, several main burners 1 on the two furnace arches, the furnace front wall 7 and the rear wall 8 The lower part is equipped with more than one secondary air nozzle 5 and exhaust air nozzle 6 under the arch. The main burner 1 is equipped with a primary air nozzle 2 and a secondary air nozzle 3. The main burner 1 can be a direct current burner or Swirl burners, several main burners 1 on each furnace arch are arranged in a straight line, and the main burners 1 on the two furnace arches near the two side walls 9 are offset to the center of the furnace by 5° to 45°; the furnace is divided from bottom to top The main combustion zone 14, the reduction zone 12 and the burnout zone 13 are provided with purge air nozzles 10 and 11 on both sides of the front and rear walls of the furnace reduction zone 12 and the...

Embodiment 2

[0047] Such as Figure 4 , Figure 5 As shown, the difference between the present embodiment and the first embodiment is only that an independent reduction inhibitor nozzle 15 is set in the primary air nozzle 2 of several main burners 1, and the reduction inhibitor nozzle 15 communicates with the air duct and fan 16 through the air duct and the blower fan 16. The tail flue after the preheater is connected, and the reduction inhibitor feed pipe 17 is connected on the air pipe; during combustion, part of the flue gas is extracted from the tail flue after the boiler air preheater through the fan 16 as the transport medium for the amino reduction inhibitor , mixed with the amino reduction inhibitor and sprayed into the furnace from the reduction inhibitor spout 15; since the extracted flue gas is micro-oxygen, this embodiment is more conducive to realizing the reducing atmosphere of the furnace and increasing the reaction zone temperature;

Embodiment 3

[0049] Such as Figure 6 As shown, the difference between the present embodiment and the second embodiment is only that several reduction inhibitor nozzles 18 are arranged on the furnace arch; during combustion, part of the flue gas is extracted from the tail flue before the boiler air preheater through the blower fan 16 as amino The conveying medium of the reduction inhibitor is mixed with the amino reduction inhibitor and sprayed into the furnace from the reduction inhibitor spout 18 in a direction parallel to the primary wind; the same technical effect as that of Embodiment 2 can be achieved.

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Abstract

The invention discloses a W-firing boiler advanced denitration combustion method. The method comprises the following steps: fire coal is sent to a hearth through primary air in the primary air nozzles of a plurality of main combustors on boiler arches of a front wall and a rear wall and is combusted, secondary air and under-arch secondary air are respectively introduced through secondary air nozzles and under-arch secondary air nozzles, exhaust gas wind is introduced through exhaust gas wind nozzles on the front wall and the rear wall, one or two layers of over-fire air are introduced through over-fire air nozzles, the excess air coefficient range of a main combustion area is 0.7-1.05, and the fire coal undergoes low oxygen combustion; the excess air coefficient range of an over-fire area is 1.05-1.3, and oxygen rich combustion is carried out; and one or more layers of an amino reduction inhibitor are injected to the hearth under the uppermost over-fire air layer to reduce nitrogen oxides in flue gas and inhibit generation of new nitrogen oxides. The W-firing boiler advanced denitration combustion method has the advantages of substantial reduction of the nitrogen oxide discharge value of the outlet of the hearth, realization of ultralow discharge, no strict temperature window or catalyst, great reduction of the denitration cost, and prevention of high temperature corrosion of water screens in the boiler.

Description

technical field [0001] The invention relates to a combustion method for deep denitrification of a W flame boiler. Background technique [0002] During the combustion of coal, nitrogen oxides (NOx) pollutants will be emitted. These pollutants will cause photochemical smog pollution, which will cause serious harm to the human respiratory system and the survival of animals and plants. my country's latest "Emission Standards of Air Pollutants for Thermal Power Plants" (GB 13223-2011) stipulates that since January 1, 2015, all coal-fired boiler nitrogen oxides (in NO 2 meter) The emission limit is 100mg / Nm 3 (Where a W-shaped flame furnace is used, the limit for existing circulating fluidized bed thermal power boilers and thermal power boilers completed and put into operation before December 31, 2003 is 200 mg / Nm 3 ). W Flame Boiler is a specific furnace type for stable combustion of low-volatile coal, such as lean coal and anthracite. There are more than one burn-off air nozz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/00F23C9/00
CPCF23C7/00F23C9/003F23C2202/40Y02E20/34
Inventor 王勇陈灿范卫东聂立刘泰生王锦生张秀昌董康薛燕辉
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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