Fuel drying device used for direct combustion biomass power station

Abstract

The invention discloses a fuel drying device used for a direct combustion biomass power station. The fuel drying device comprises a conveyor; the conveyor is provided with an upper conveying belt for conveying of an upper layer and a lower conveying belt for conveying of a lower layer; a hot air box is installed above the upper conveying belt; the bottom of the hot air box is installed with a hot air uniform plate; a plurality of hot air inlets are formed in the top of the hot air box; a cold air box is arranged between the upper conveying belt and the lower conveying belt of the conveyor; a feeding hopper is arranged above a head of the conveyor; the rear part of the conveyor is installed with a discharge hopper; and a material layer room is arranged between the hot air uniform plate and the upper conveying belt. The fuel drying device can recycle flue gas waste heat of the power plant to achieve the fuel drying of the direct combustion biomass power station, is energy-saving and environment-friendly; and at the same time, a large amount of fuel can be process, so that the demand for fuel of the power station can be met. The drying device is good in liquidity and has no requirements on the shape of the fuel, and congestion in the drying process is avoided.

Description

technical field [0001] The invention relates to a fuel drying device used in a direct-fired biomass power plant. Background technique [0002] At present, there is no equipment directly used for fuel drying of direct-fired biomass power plants in China, and the equipment related to biomass drying is only rotary kiln and tunnel type radiation furnace. Similar to the equipment for drying bulk biomass fuels is the rotary kiln, which can solve the drying of sawdust biomass. The traditional rotary kiln is composed of a large cylinder with a thicker diameter and a relatively long length, namely the material cylinder. The cylinder is supplemented by an electric motor to drive the gear. When rotating, the material runs from the upper end to the lower end under the action of gravity and inclination. The hot air enters from the upper end of the barrel and runs in the same direction as the material. The lower end of the barrel is equipped with a material outlet and an air material s...

AI Technical Summary

Problems solved by technology

The moisture content of the fuel exceeds the standard, and it cannot be dried, which causes the ignition point of the fuel in the furnace to move backward. The heat is not completely absorbed by the boiler, and it is discharged with the flue gas, so the temperature of the flue gas rises, and because the excess moisture enters the furnace for heating Expansion, in addition to absorbing a large amount of energy, will also consume more fuel; and the water vapor content in the flue gas will increase significantly, and the amount of flue gas will also increase greatly, taking away more heat; thus bringing the boiler system High, medium and low temperature superheaters, economizers, and air preheaters have an increased risk of dust collection, dust collectors and induced draft fans are overloaded, power consumption increases, service life is shortened, and failures occur frequently, seriously affecting the normal operation of boilers and power generation systems

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