Symmetrical-combustion W-Type flame boiler

Abstract

The invention discloses a symmetrical-combustion W-Type flame boiler. Connecting wallsunder arches arearranged at the junction of an upper hearth and a lower hearth, extend downwards and vertically so as to approach a cold ash bucket area, and extend to left and right walls of the boiler in the width direction of the boiler so as to form a semi-closed area under a front arch and a rear arch. Limited in the semi-closed area, the gas-powder mixtures of burners are expanded to move down to finally arrive the middle upper area of the cold ash bucket and then are turned to move upward, thereby ensuring that two symmetrical U-type flames are formed at the front and rear walls and meet at the centers of the hearths to form a symmetrical W-type flame. A row of backflow flue gas ports are formed in the upper part of the connecting wall under the arch and are in one-to-one correspondence with the burners at the arches along the width direction of the boiler, so that the gas-powder mixtures in the areas of the burners are conveniently heated by high-temperature backflow flue gas under the arches; the height size of the connecting wall under the arch meets the expression of l1 / l0=0.6-0.7; the positioning in the height direction of the backflow flue gas ports meets the expression of l2 / l1=0.25-0.35; the width of the backflow flue gas ports is approximately twice of the equivalent diameter of burner nozzles, and the height / width 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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