Floater type blast cap
A technology of float type and hood, which is applied in the field of structural design of hood in the air distribution device, which can solve the problems of wearing hood, impact of bed material, reducing the effective space of the air chamber, etc., and achieves reduced resistance loss, reduced pressure drop, and large flow area Effect
Inactive Publication Date: 2008-07-23
TSINGHUA UNIV
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Problems solved by technology
The labyrinth air cap has the advantages of uniform fluidization of materials in the circulating fluidized bed boiler bed and small total resistance loss of the air distribution system, but the labyrinth air cap cannot ensure uniform air distribution of the circulating fluidized bed boiler air distribution plate, and individual The phenomenon that the labyrinth hood shoots through the material layer in the circulating fluidized bed boiler bed, and the material in the circulating fluidized bed boiler bed is easy to fall from the labyrinth hood into the circulating fluidized bed boiler air chamber, reducing the effective space of the air chamber and damaging Isobaric air distribution capacity of the air chamber
The mushroom-head hood overcomes the disadvantage that the labyrinth hood shoots through the material layer in the circulating fluidized bed boiler bed and the material is easy to fall from the hood into the circulating fluidized bed boiler air chamber, but the lateral air outlet of a mushroom-head hood Easily carries bed material to impact and wear down adjacent hoods
After running for a period of time, it is necessary to stop the boiler to replace the air cap, which affects the utilization rate of the unit and increases the economic burden of the circulating fluidized bed boiler power plant
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[0015] For a circulating fluidized bed boiler with a capacity of 75 tons per hour, the area of the air distribution plate is 46 square meters, and the primary air flow rate is 319727 standard cubic meters per hour, which is about 1225440 cubic meters per hour under rated conditions. Replace all 820 mushroom caps with floater caps as described in this invention. The diameter of the air inlet of the airflow channel of the float hood used is 60mm, the diameter of the air outlet is 110mm, and the height is 250mm; the radius of the hemisphere at the top of the float is 85mm, and the diversion skirt is a semicircular groove with a section radius of 10mm and a radius of 95mm; The upper diameter of the conical section in the middle of the float is 110mm, the lower part is 60mm in diameter, and the height is 250mm. The inside is an M20×250 internal thread; the bottom is a M20×100 bolt, and the bolt head is a hemisphere with a diameter of 60mm. The apex angle of the conical airflow ch...
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The invention provides a float hood, relating to the wind distribution device in the fluidized bed boiler, which is formed by a taper air channel and a float. Wherein, the top of float is a semi-ball with flow guiding skirt edge; its middle part is a taper section with inner screw thread; the lower part is a bolt with semi-ball head; the top angle of taper air channel is 10-15 degrees. The invention has the advantages of uniformly fluidizing the material inside the circulating fluidized bed boiler, improving uniform wind distribution, reducing whole resistance of wind distribution system and preventing abrasion.
Description
technical field [0001] The invention relates to an air distribution device used in a fluidized bed boiler, in particular to the structural design of an air cap in the air distribution device. It is mainly used in circulating fluidized bed combustion boilers, and can also be used in fluidized bed reactors in chemical industry and metallurgy. Background technique [0002] Circulating fluidized bed boilers are widely used due to their combustion efficiency equivalent to that of pulverized coal boilers, low-cost high-efficiency desulfurization methods and low nitrogen oxide emissions, and their overall installed capacity and unit capacity have increased year by year. The circulating fluidized bed boiler air cap is an important part of the circulating fluidized bed boiler. It plays an important role in the uniform fluidization of the material in the circulating fluidized bed boiler bed and the uniform air distribution of the circulating fluidized bed boiler air distribution plate...
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IPC IPC(8): F23C10/20
Inventor 岳光溪杨海瑞王启民刘青张海张建胜
Owner TSINGHUA UNIV