Hot blast stove for grain dryer

Abstract

The invention discloses a hot blast stove for a grain dryer. The grain dryer communicates with the hot blast stove through a pipeline. The hot blast stove comprises a combustion chamber and a circulation chamber, the combustion chamber comprises a feeding device, a conveying device and a combustion device from top to bottom in sequence, and a settling chamber and a temperature control chamber are arranged in the circulation chamber. Through cooperative use of parts such as a transmission shaft, a cam, a mandrel, a support, an operating rod, a pressing plate, a spring and the like, the conveying device can accurately convey fuel in the vertical direction and also solves the problem that a spiral feeder is prone to material blocking; meanwhile, the pressing plate crushes granular biomass fuel, so that the granular biomass fuel can be combusted more sufficiently and are flammable; through cooperation of the feeding device, the conveying device, the combustion device and the circulation chamber, hot air in the combustion device is mixed with cold air after being subjected to multi-layer gravity dust removal, and the conveyed hot air is cleaner.

Description

technical field [0001] The invention belongs to the field of agricultural machinery manufacturing, in particular to a hot air stove for a grain dryer. Background technique [0002] The grain dryer is a type of dryer that dries grain, and the hot blast stove is an important component that provides heat for the dryer. When the grain dryer is working, the motor drives the impeller of the axial flow fan to rotate at a high speed, so that the hot air generated by the combustion of the coal furnace is sucked into the fan through the upper part of the baffle plate, and forms a mixture with the cold air sucked into the fan from the lower part of the baffle plate, and passes through the windshield pipe After entering the stacking rack, it diffuses. When the mixed gas passes through the grain layer on the stacking rack, the temperature of the millet is increased appropriately, and a large amount of water vapor is taken away to gradually dry the millet. [0003] At present, the workin...

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Problems solved by technology

[0003] At present, the working efficiency of the existing hot blast stove is low, and it is easy to cause a large amount of heat loss during the working process, and the hot air in the combustion chamber of the existing hot blast stove is not mixed uniformly, so that the discharged hot air cannot achieve the desired effect

[0004] Most of the hot blast stoves manually feed the fuel into the furnace body. Even if there is an automatic conveying device for the hot blast stove to realize automatic feeding, some biomass fuels are light in weight, and they are easy to float during the vertical feeding process and cannot be accurately dropped on the combustion plate. Complete combustion also brings more dust to the combustion pool

Some of the hot blast stoves in the prior art adopt a flat tube feeding method, which causes the biomass fuel to easily accumulate on the edge of the combustion chamber, and the combustion efficiency is low, and the biomass fuel is sometimes cut, crushed, etc. Screws and other small metal objects will be mixed in. During the conveying process through the screw feeder, it is easy to cause material jams, and in severe cases, the screw feeder will be directly damaged.

[0005] The hot blast stove currently used cannot stir and mix the cold air and hot air, resulting in uneven temperature of the mixed gas, and the filter screen for filtering the dust in the gas is easily blocked, which affects the normal flow of the gas

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