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Wall-type combustion boiler mixed coal blending combustion optimization method

An optimization method and boiler technology, applied in the direction of combustion methods, burners for burning powder fuel, burners, etc., can solve the problems of high-temperature corrosion emission concentration of slagging on the left and right side walls, difficulty in igniting and burning low-volatile coal, etc., to avoid Effects of slagging and high-temperature corrosion, improvement of ignition and combustion stability, and increase of oxygen concentration

Active Publication Date: 2019-10-11
华能沁北发电有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is the difficulty in ignition and combustion of low-volatile coal caused by mixed coal in the multi-coal furnace of the active front and rear wall pulverized coal combustion boilers, slagging on the left and right side walls and high temperature. Corrosion and NO x The problem of high emission concentrations

Method used

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  • Wall-type combustion boiler mixed coal blending combustion optimization method
  • Wall-type combustion boiler mixed coal blending combustion optimization method
  • Wall-type combustion boiler mixed coal blending combustion optimization method

Examples

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Embodiment 1

[0031] like figure 1 and figure 2 As shown, this embodiment provides a method for optimizing the coal-mixed combustion of a wall-fired boiler, which includes dividing the coal used for combustion in the wall-fired boiler into two types: A coal type and B coal type; the wall-fired boiler includes a boiler furnace 1. Boiler front wall 2. Boiler back wall 3. Several burners 4. Several primary air ducts 5. Several burnout air nozzles 6. Several side burnout air nozzles 7. Several wall-mounted air nozzles 8 , The burner 4 is arranged on the boiler front wall 2 and the boiler rear wall 3 .

[0032] The burner 4 includes a burner A and a burner B. The burner A burns pulverized coal of the A coal type, and the B burner burns the pulverized coal of the B coal type. Air duct and B primary air duct, A primary air duct only transports coal type A, B primary air duct only transports B coal type, A burner is connected with the output end of A primary air duct one by one, and B burner It...

Embodiment 2

[0039] On the basis of Example 1, such as image 3 As shown, for a 1000MW wall-type hedging pulverized coal combustion boiler, three layers of burners 4 are arranged on the boiler front wall 2 and boiler rear wall 3 respectively, and eight burners 4 are arranged on each layer, and the total number of burners 4 is 48; The wall air nozzle 8 is arranged at the center of the adjacent two-layer burner 4 along the height direction of the boiler front wall 2 and the boiler rear wall 3, and is at the same position as the side burn-out air nozzle 7 in the width direction of the boiler front wall 2 and the boiler rear wall 3 , 8 wall-adhering air spouts 8 are arranged in total, and 4 wall-adhering air spouts 8 are respectively arranged on the boiler front wall 2 and the boiler rear wall 3.

[0040] The lowest layer burners 4 are arranged as shown in the figure, and the types of coal fed in order from left to right are A, B, A, B, B, A, B, A; the middle layer burners 4 are arranged as sh...

Embodiment 3

[0042] On the basis of Example 1, such as Figure 4 As shown, for a wall-type hedging pulverized coal fired boiler with a capacity of 1000MW and above, four layers of burners 4 are arranged on the front wall 2 of the boiler and the rear wall 3 of the boiler, each layer has eight burners 4, and the total number of burners 4 is 64 only. The wall-attached air nozzle 8 is arranged at the center of the adjacent two-layer burner 4 along the height direction of the boiler front wall 2 and the boiler rear wall 3, and at the position of the side burn-out air nozzle 7 in the width direction of the boiler front wall 2 and the boiler rear wall 3 Similarly, a total of 12 wall-mounted air nozzles 8 are arranged, and 6 wall-mounted air nozzles 8 are respectively arranged on the boiler front wall 2 and the boiler rear wall 3 .

[0043] The burners 4 in the lowest layer are arranged as shown in the figure, and the types of coal fed in sequence from left to right are A, B, A, B, B, A, B, A; th...

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Abstract

The invention discloses a wall-type combustion boiler mixed coal blending combustion optimization method, and relates to the field of wall-type boiler pulverized coal combustion. The method comprisesthe following steps that combustion pulverized coal is divided into coal A and coal B; and a wall-type combustion boiler comprises combustors, primary air pipes, a burning-out air nozzle, a side burning-out air nozzle, wall-adhering air nozzles, a boiler front wall and a boiler rear wall, the combustors are arranged on the boiler front wall and the boiler rear wall, the combustors correspond to the primary air pipes in a one-to-one mode, and the first air pipes for conveying the coal A and the coal B are staggered and are connected with combustors arranged on the front wall and the rear wall of the boiler. The combustors are arranged in a layered mode in the height direction of a furnace, and the wall-adhering air nozzles are arranged between the adjacent combustor layers and close to theleft and right side walls. Through the implementation of the method, ignition and stable combustion of low-volatile coal can be enhanced, NOx generation can be reduced, and slagging and high-temperature corrosion of water-cooled furnace walls of the left and right side walls can be effectively prevented.

Description

technical field [0001] The invention relates to the field of pulverized coal combustion of wall-type boilers, in particular to an optimization method for coal-mixed combustion of wall-type combustion boilers. Background technique [0002] In recent years, my country's coal-fired power plants are generally facing the pressure of tight supply in the coal market and rising costs. Coal-fired boilers are fed with diverse types of coal and complex coal quality. More and more coal-fired boilers use mixed coal combustion. At present, there are mainly two methods of coal blending in coal-fired boilers at home and abroad: "blending outside the furnace" and "blending in the furnace". "Blending outside the furnace" is to send two or more coal types into the coal mill in the form of pre-blended raw coal, and the ground coal powder is directly sent into the furnace, but the mixed coal types after pre-blending The ignition and burnout characteristics of pulverized coal are quite different...

Claims

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Application Information

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IPC IPC(8): F23D1/00F23K1/00
CPCF23D1/00F23K1/00
Inventor 靳轲王勇强程世军周月桂
Owner 华能沁北发电有限责任公司
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