Environment-friendly multi-stage internal-circulation impurity removing system of grain dryer

Abstract

The invention discloses an environment-friendly multi-stage internal-circulation impurity removing system of a grain dryer. The system comprises a closed impurity removing mechanism, a closed drying mechanism and a closed heat supply mechanism, wherein the closed impurity removing mechanism comprises an impurity removing bin provided with a gravel discharging barrel, a grain discharging barrel, a main grain feeding pipe, a straw discharging suction port and an air blower, and an air delivery pipe is arranged in the air incoming direction of the air blower; the closed drying mechanism comprises a drying bin provided with a grain feeding port, a heating exhaust steam discharging pipe, a heating steam distributing pipe and a heating steam delivery pipe; the closed heat supply mechanism comprises a combustion furnace provided with a fuel feeding pipe, a hot air supply port, an inclined bottom wall and a combustion air inlet; the straw discharging suction port and the combustion air inlet are communicated; a heat exchanger is arranged between the closed impurity removing mechanism and the closed drying mechanism, and both the air delivery pipe and the heating exhaust steam discharging pipe pass through the heat exchanger.

Description

technical field [0001] The invention relates to a multi-stage internal circulation environment-friendly impurity removal system for a grain dryer, which belongs to the technical field of grain dryer production and manufacturing. Background technique [0002] Grain is not only a daily necessity of the people, but also an extremely important national strategic reserve material. All countries in the world attach great importance to grain production and reserve. The natural moisture of freshly harvested grain is generally around 17% to 32%, and the safe moisture of stored grain is around 13%. Therefore, if it is necessary to store grain safely, the grain precipitation must reach a safe moisture level before storage. [0003] In the prior art, grain drying technical equipment is mainly divided into two categories: continuous type and batch type, and the drying method of grain mainly adopts the convection drying method, that is, hot air is used as the drying medium. In the contin...

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Problems solved by technology

In the prior art, a large amount of dust will be generated when the grain is cleaned of impurities, which makes the working environment relatively harsh. In order to purify the environment of the workplace, it is usually necessary to install a large number of dust suction and dust removal devices, which not only increases the cost of the grain drying place Equipment procurement costs, and increased energy costs for grain drying operations

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