Coal drying device for coal-fired power plant

Abstract

The invention discloses a coal drying device for a coal-fired power plant, specifically relating to the field of coal drying, comprising a rotary drum dryer and a hot blast stove, one end of the rotary drum dryer is fixedly installed with a crushing filler hopper, and the inside of the crushing filler hopper is provided with a meshing The crushing mechanism, the other end of the drum dryer is fixedly connected with the heat preservation conveying mechanism, the top surface of the drum dryer is fixedly installed with a waste heat recovery drum, one end of the waste heat recovery drum is fixedly installed with a drying air intake mechanism, and the other end of the waste heat recovery drum An air guide pipe is fixedly connected, and a heat exchange tube mechanism is fixedly installed inside the rotary drum dryer and the waste heat recovery cylinder. In the present invention, by setting the waste heat recovery cylinder structure, the heat exchange tube mechanism is used to exchange the heat energy of the hot air inside the drum dryer to heat the fresh air, and through the internal heat conduction cylinder structure, the residual heat of the dried hot air is conducted to heat the fresh air, so as to realize waste heat recovery. , improve energy utilization, and achieve the purpose of environmental protection and emission reduction.

Description

technical field [0001] The invention relates to the technical field of coal drying, in particular to a coal drying device for a coal-fired power plant. Background technique [0002] At present, my country's thermal power plants mainly use coal as the combustion fuel, and now the price of high-moisture coal is relatively low. More and more power plants are beginning to blend high-moisture coal. When high-moisture coal is burned in the boiler, it will vaporize and absorb a large amount of Heat absorption will bring a series of effects to the operation of the boiler unit at the same time, in order to solve the large amount of moisture contained in the coal. [0003] At present, there are a large number of coal drying devices, mainly including rotary drum dryers, vertical tube airflow dryers and fluidized bed dryers, all of which require a large amount of hot air to be input. The thermal efficiency accelerates the evaporation of water to achieve drying, but in actual use, due to...

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Problems solved by technology

[0003] At present, there are a large number of coal drying devices, mainly including rotary drum dryers, vertical tube airflow dryers and fluidized bed dryers, all of which require a large amount of hot air to be input. The thermal efficiency accelerates the evaporation of water to achieve drying, but in actual use, due to the simple structure and single function of traditional equipment, the hot air drying is released after contacting the coal, and a large amount of heat energy remaining in the hot air is lost, and the energy utilization rate is low. After the hot air is dried, it is transported to the storage mechanism or transported by the open-air conveyor belt. During the cooling process, a large amount of water vapor in the air condenses and easily leads to the secondary moisture of the coal, which has certain defects.

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