A Symmetrical Combustion W-shaped Flame Boiler

Abstract

The invention discloses a W-shaped flame boiler with symmetrical combustion. An arched connecting wall is arranged at the junction of the upper and lower furnaces. The left and right side walls form a semi-enclosed area under the front and rear arches, and the air-powder mixture of the burner is limited in this semi-enclosed area to expand downward and finally reach the middle and upper area of ​​the cold ash hopper and turn upward to ensure that the front, Two symmetrical U-shaped flames are formed on the rear wall side, and the two U-shaped flames meet at the center of the furnace to form a symmetrical W-shaped flame. There is a row of return flue gas ports on the upper part of the connecting wall under the arch, corresponding to the burners in the arch along the furnace width direction, so that the high-temperature return flue gas under the arch can heat the air powder mixture in the burner area; the height of the connecting wall under the arch meets l1 / l0=0.6~0.7, the height direction positioning of the backflow flue gas port satisfies l2 / l1=0.25~0.35, the width of the backflow flue gas port is about twice the equivalent diameter of the burner nozzle, and the aspect ratio is 1.5~2.

Description

technical field [0001] The invention relates to a W-shaped flame boiler, in particular to a W-shaped flame boiler capable of ensuring symmetrical combustion in a furnace, and belongs to the technical field of W-shaped flame boiler combustion. Background technique [0002] W-type flame boiler is a kind of boiler specially designed for burning low volatile fuels (such as anthracite, lean coal and petroleum coke) in developed industrial powerhouses in Europe and America in the 1950s and 1960s. From the perspective of its furnace structure and combustion organization, the W-shaped flame boiler has the following advantages in burning low-volatile coal: (a) the unique double-arch furnace structure strengthens the radiation of the high temperature of the arch wall to the burner area; (b) ) A large number of sanitary combustion belts are laid on the water-cooled walls around the burner area to maintain the high temperature level of the fire area; (c) Construct a W-shaped flame combu...

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Problems solved by technology

[0003] Combustion asymmetry is more harmful to the economical and safe operation of W-type flame boilers. In severe cases, the combustion stability in the furnace is poor, and the negative pressure in the furnace fluctuates greatly, resulting in frequent fire extinguishing accidents; In addition, for supercritical W-type flame boilers, combustion asymmetry also causes uneven heat load distribution in the furnace, resulting in relatively large temperature deviations in water-cooled walls. Large and wall temperature exceeding the allowable value, excessive deviation of water wall temperature and wall temperature seriously exceeding the allowable value will lead to cracking of water wall fins or even pipe burst accidents

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