Boiler combustion optimization adjusting method

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...

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

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