Boiler combustion optimization adjusting method

An adjustment method, boiler combustion technology, applied in the direction of combustion method, combustion chamber, combustion equipment, etc., can solve the problems of coking in the furnace, easy to break the water wall, coking of the water wall, etc., and achieve the reduction of NOx emissions, the improvement of coking, and the coking Effect of Block Thickness Reduction

Active Publication Date: 2017-11-17
中国大唐集团科学技术研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Coking hazards: 1) Deteriorating heat transfer and aggravating coking; 2) Coking of the water wall affects heat transfer and reduces boiler efficiency; 3) When coking is serious, large pieces of slag fall and easily damage the water wall, causing serious accidents
[0006] Due to the original laying of a large number of sanitary combustion belts in the lower furnace, when lean coal or low-quality bituminous coal is used, it will inevitably cause serious coking in the furnace, threatening the safe operation hours of the boiler

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0074] like figure 1 As shown, in the boiler combustion optimization adjustment method of this embodiment, four ventilation slits are opened longitudinally in the wing wall to blow secondary air inward. The outer diameter of the water wall tube at the wing wall is 120.65mm, the center distance is 146.4mm, and the pipe gap is 25.4mm. The outer diameter of the upper and lower pipes on the wing wall is 69.85mm, and the two ends are connected by reducing pipes. The thick pipes at the four ventilation belts are replaced with thin ones, the pipe gap is 76.55mm, and the height of the ventilation belts is set to the wing wall pipes total length, or set on half of the wing wall.

[0075] Four ventilation slots are opened longitudinally in the wing wall to blow the secondary air inward. The outer diameter of the water-cooled wall tube at the wing wall is larger (120.65mm), the center distance is 146.4mm, and the gap between the tubes is 25.4mm. The diameter is small (69.85mm). The orig...

Embodiment 2

[0087] In the boiler combustion optimization adjustment method of this embodiment, on the basis of Embodiment 1, the boiler transformation realizes the optimal F air jet flow angle, increases the pulverized coal stroke, and reduces fly ash combustibles. Strengthen the heat absorption of the lower arch area, reduce the temperature level of the high temperature area of ​​the whole furnace, and reduce thermal NOx.

[0088] The optimization of the air distribution method specifically includes:

[0089] Obtain the operating conditions of the boiler at different F-level secondary air downtilt angles under the predetermined coal type and load, wherein the operating conditions at least include: NOx, CO, O2 of the flue gas at the outlet of the economizer; NOx, CO, O2 of the flue gas at the outlet of the boiler; thermal efficiency of the boiler; coal industry and elemental analysis; fly ash and slag sampling analysis; flue gas temperature at the outlet of the economizer; flue gas temper...

Embodiment 3

[0122] The combustion optimization and adjustment method of the boiler in this embodiment, the fuel is burned in a staged combustion manner, which specifically includes: selecting a predetermined proportion of combustible coal and anthracite, and using the combustible coal to react with oxygen to become the first-stage combustion, wherein the combustible coal is The mixture of bituminous coal or bituminous coal and lean coal; the high-temperature flue gas atmosphere formed in the first stage, engulfed by high-temperature flue gas, ignites anthracite to form a second-stage combustion, in which the volatile content of combustible coal is higher than that of anthracite, And the volatile content is more than 25%, and the ratio of bituminous coal: anthracite is greater than 1:1; among them, the dry ash-free base volatile content of the furnace coal is kept at 15%10% is required for staged combustion of bituminous coal, lean coal and anthracite.

[0123] In this embodiment, the W-sha...

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Abstract

The invention relates to a boiler combustion optimization adjusting method. The boiler combustion optimization adjusting method comprises that a wing wall is vertically provided with four ventilation slits, secondary air is blown into the wing wall, water-wall tubes on the wing wall have the external diameter of 120.65 mm, the center distance of 146.4 mm and the tube spacing of 25.4 mm, and tubes on the upper and lower parts of the wing wall have the external diameter of 69.85 mm; in an original design, the water-wall tubes are connected with the tubes through reducer pipes, thick tubes on four ventilation bands needing ventilation are replaced by thin tubes, i.e., large and small heads on the upper portion are moved down, the tube spacing is 76.55 mm, the height of the ventilation bands are set to be the total length of the tubes of the wing wall or the ventilation bands are only arranged on the upper half part of the wing wall, and a refractory belt on a tube at each of the two sides of a ventilation slot is removed. According to the invention, the original wing wall no longer has large coke and only has loose coke the thickness of which is smaller than 50 mm, and has no threat to safe operation of a machine set. The coking conditions of the front and rear walls are greatly improved, and the coke thickness is obviously reduced. The NOx discharge amount is also reduced.

Description

technical field [0001] The invention relates to a boiler combustion optimization adjustment method. Background technique [0002] In order to ensure the combustion stability of the boiler, a large number of sanitary combustion belts are laid in the furnace to increase the temperature of the furnace and ensure stable combustion, but the temperature of the furnace will be higher than the ash melting point. The area where the protective combustion belt is laid will vary according to the quality of the coal. When the coal quality is poorer, the area of ​​the protective combustion belt needs to be laid. The original FW combustion belt laying concept (in the case of burning anthracite, arches, front and rear vertical walls, wing walls (cut feet), and side walls 1-4 areas need to be laid, and the upper part of the cold ash hopper and the middle part of the cold ash hopper are 5-6 areas Depending on the coal quality, it is the pre-laying area, and the schematic diagram of the layin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23M5/00
CPCF23M5/00
Inventor 刘彦鹏张志刚张新陈坤洋
Owner 中国大唐集团科学技术研究总院有限公司
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