Grain drying system based on multi-fluid heat pipe

Abstract

The invention relates to a grain drying system based on a multi-fluid heat pipe. The grain drying system based on the multi-fluid heat pipe comprises a dryer, a fresh air port, an evaporator, a condenser, a compressor and an expansion valve, wherein the dryer is connected to an air exhaust outlet through an air exhaust pipeline; the evaporation ends of a first multi-fluid heat pipe heat exchange device and a second multi-fluid heat pipe heat exchange device are arranged on the air exhaust pipeline; the evaporator is connected to a water storage tank; the condenser is arranged in an air supplypipe; the two ends of the compressor and the expansion valve are respectively connected to the condenser and the evaporator; and the condensation ends of the first multi-fluid heat pipe heat exchangedevice and the second multi-fluid heat pipe heat exchange device are arranged in the fresh air port. The multi-fluid heat pipe heat exchange devices are used for preheating fresh air. A multi-fluid sleeve type heat pipe is used for heating water flowing in a sleeve with the relatively low temperature, so that the heated water serves as a heat source of a water source heat pump; and the water source heat pump is used for reheating the preheated fresh air to meet the air inlet requirements of the grain dryer. The grain drying system improves the recovery utilization rate of the waste heat of exhaust air of the dryer, and can be used for drying food or seeds.

Description

technical field [0001] The invention relates to a grain drying system, in particular to a grain drying system based on multi-fluid heat pipes. Background technique [0002] Freshly harvested grains contain high water content. Due to the large amount of grains, it is difficult to concentrate on drying, and they are prone to mildew and cause losses. The heat pump drying technology is a mild and close to natural drying method, which can retain the nutrients in the dried material to the greatest extent without destroying its original structure. And because the required drying time is short, it has a low impact on the grain germination rate. Therefore, the existing grain drying gradually adopts heat pump drying. At the same time, the use of heat pump system drying can prevent waste gas and waste residue pollution caused by combustion. [0003] Heat pump drying is a new type of drying technology that transfers heat from a low-temperature heat source to a high-temperature heat so...

AI Technical Summary

Problems solved by technology

The exhaust air temperature is high, and it is directly discharged into the atmosphere, causing energy waste

At present, in some domestic heat pump drying systems, some dryers directly place the evaporator in the exhaust air environment, and use the hot air discharged from the dryer as the heat source. Because the exhaust air contains a lot of dust and impurities, the exhaust air needs to be cleaned. Dust removal treatment or interval cleaning of the evaporator results in a waste of waste heat resources and relatively high operating costs. In order to solve the above problems, some heat pipe drying systems in China use multi-fluid sleeve heat pipes to realize heat pipe cooling for fresh air and The simple heat exchange of the return air, the fresh air after the simple heat exchange can reach more than 25 degrees, while the inlet air temperature of the dryer is greater than 55 degrees, the fresh air after the simple heat exchange obviously cannot reach the inlet air temperature of the dryer, It is also necessary to reheat the fresh air, which is time-consuming and laborious

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