CFB boiler inlaid type hood air distributing device and improving method thereof

Abstract

The invention discloses a CFB boiler inlaid type hood air distributing device and an improving method thereof, and belongs to the technical field of heat-engine plant circulating fluidized bed boiler air distribution plate transformation. The CFB boiler inlaid type hood air distributing device comprises a tube nest, air distribution plate castable and the like. The tube nest is located at the upper portion of an air chamber. Hearth water wall tubes are evenly arranged below the tube nest. The air distribution plate castable is laid on the tube nest with reserved gaps. An air pipe B is inlaid in an air pipe A, penetrates the tube nest and extends into the air chamber. The air pipe A and the air pipe B are fixed through welding points. A strengthening casing pipe is fixed to the intersection position of the air pipe A and the tube nest. Small air holes of the air pipe B are formed in the upper portion, above the air pipe A, of the air pipe B. An I-shaped hood is buckled at the upper portion of the air pipe A, and I-shaped hood air outlet holes are formed in the I-shaped hood. According to the CFB boiler inlaid type hood air distributing device and the improving method thereof, welding and fixing points are broken by dismounting the hood, part of air pipes are cut, new air pipes are inserted, welding and fixing are conducted, and therefore the running resistance of an air distribution plate can be adjusted; and the problems that the air distributing uniformity is poor, temperature distribution is uneven, slag leaks in the air chamber, and the power consumption of a primary draught fan is large are solved.

Description

technical field [0001] The invention belongs to the technical field of reforming an air distribution plate of a circulating fluidized bed boiler in a thermal power plant, and in particular relates to a CFB boiler nested air cap air distribution device and a reforming method thereof. Background technique [0002] At present, my country is the country that uses the most circulating fluidized bed boilers (CFB boilers) in power plants in the world. There are more than 2,000 large and small circulating fluidized bed power plant boilers in operation, of which large circulating fluidized bed power plant boilers of 410t / h or more There are more than 140 units. As one of the important parts to ensure the normal fluidized combustion of the circulating fluidized bed boiler, the air distribution plate, after a long period of operation, deviates from the designed resistance of the air distribution plate, the long-term action of the wind and the bed material causes the air duct eye to wear...

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Problems solved by technology

[0004] The purpose of the present invention is mainly to solve the serious wear and tear of the small hole of the air guide pipe and the vent of the hood after the long-term operation of the air distribution plate of the boiler, resulting in the resistance of the air distribution plate being lower than the design value, the uniformity of the air distribution, and the bed temperature distribution. Unevenness, slag leakage in the air chamber, and increased power consumption of the primary fan, etc., and provide a CFB boiler nested air distribution device for the air cap

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