An internal circulation grain drying tower

Abstract

The invention discloses an internal circulation type grain drying tower, which comprises a first-stage drying bin and a second-stage drying bin. The grain to be dried enters the first-stage drying bin through the first-stage grain inlet, and exits from the first-stage drying bin after passing through the first-stage drying bin. The grain is discharged from the grain port, and the discharged grain is lifted to the second-stage grain inlet by the hoist, and then discharged from the second-stage grain outlet after passing through the second-stage drying bin, and a part of the cold air entering the air inlet enters the second-stage hot air channel for heating After that, it flows to the second-stage drying section. Part of the cold air entering the air inlet enters the cooling section through the cold air channel, and the hot air passing through the second-stage drying section and the cooling section enters the mixing air channel, and then flows to the first-stage hot air channel. After being heated again, it is introduced into the first-stage drying section. And a drying section, the air passing through a drying section forms waste gas to be discharged, and the hot air flowing out from a drying section enters the preheating section through the waste heat air channel and the preheating air channel in turn, and finally forms exhaust gas to be discharged. The invention realizes the repeated utilization of heat and reduces the heat loss in the grain drying process.

Description

technical field [0001] The invention relates to the technical field of grain drying equipment, in particular to an internal circulation grain drying tower. Background technique [0002] my country's total annual grain output has reached 600 million tons, but the high-moisture grains after harvest have not had time to dry and have not reached safe storage moisture, resulting in 5% of the losses caused by mildew, germination, and deterioration in storage, transportation, and processing. About 60 billion catties, the economic loss is as high as about 50 billion yuan per year, and the grain loss is more serious in the years with abnormal climate in the south and north. In recent years, due to the improvement in the understanding of grain drying and the promotion of agricultural machinery promotion and subsidy policies, grain drying machinery has been popularized and applied rapidly, but the proportion of mechanized drying of the total grain is less than 30%, and a core leading te...

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Problems solved by technology

[0002] my country's total annual grain output has reached 600 million tons, but the high-moisture grains after harvest have not had time to dry and have not reached safe storage moisture, resulting in 5% of the losses caused by mildew, germination, and deterioration in storage, transportation, and processing. About 60 billion catties, the economic loss is as high as 50 billion yuan per year, and the food loss is even more serious in the years with abnormal climate in the south and north

In recent years, due to the improvement in the understanding of grain drying and the promotion of agricultural machinery promotion and subsidy policies, grain drying machinery has been popularized and applied rapidly, but the proportion of mechanized drying of the total grain is less than 30%, and a core leading technology has not yet been formed.

Drying technology is still relatively backward. At present, more than 99% of grain dryers in my country have a series of problems such as high drying cost, large heat loss, and no exhaust gas waste heat recovery. Traditional dryers are arranged vertically. After drying, simmering and cooling, the dry food is discharged directly from the bottom

After the hot air in this structure enters the tower to dry the grain, the waste gas is directly discharged to the atmosphere on both sides, and most of the heat is lost. Although some equipment leads the waste gas out through the pipeline for recycling, the recovery also causes the loss of the tower temperature, making the overall equipment Reduced efficiency

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