Air energy injection enthalpy-increasing ultra-low temperature cascade dryer

Abstract

The invention relates to an air energy injection enthalpy-increasing ultra-low temperature cascade dryer comprising a first circulating system and a second circulating system. The first circulating system is a refrigeration system, and the second circulating system is a heating system; refrigerant gas evaporating in the first circulating system exchanges heat with liquid refrigerants condensing in the second circulating system, so that the refrigerant gas provides heat to the second circulating system through an intermediate heat exchanger via a compressor after heat in air is absorbed through evaporation in the first circulating system; the first circulating system and the second circulating system are connected through the intermediate heat exchanger, and the refrigerant gas evaporatingin the first circulating system exchanges heat with the liquid refrigerants condensing in the second circulating system, so that the refrigerant gas evaporating in the circulating system provides heat to the second circulating system; and the first circulating system is provided with an auxiliary enthalpy-increasing system which comprises an enthalpy-increasing valve and an enthalpy-increasing electronic expansion valve, and the enthalpy-increasing valve and the enthalpy-increasing electronic expansion valve are installed on the first circulating system through auxiliary pipelines. Accordingto the air energy injection enthalpy-increasing ultra-low temperature cascade dryer, the problem of the operation stability of an air source heat pump at a severe cold area is solved effectively; andthe dryer has the advantages of high efficiency, energy saving, emission reduction, safety and reliability, long service life, simple operation and the like.

Description

technical field [0001] The invention relates to the technical field of material drying, in particular to an ultra-low temperature cascade dryer for increasing enthalpy by air injection. Background technique [0002] Drying refers to the process of removing moisture in some way and retaining solid content. Usually refers to the process of passing hot air to evaporate and take away the moisture in the material. According to the three heat transmission methods of heat conduction, heat convection, and heat radiation, there are three corresponding drying methods: drum drying, hot air drying and far-infrared drying. [0003] Traditional drying often uses heating or dehumidification of materials to make the drying materials meet the drying requirements. Traditional gas-fired, coal-fired and other fuel-burning dryers have the following disadvantages: their combustion consumes a lot of energy and produces CO 2 and other greenhouse gases, and in the drying process, the material temp...

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Problems solved by technology

[0003] Traditional drying often uses heating or dehumidification of materials to make the drying materials meet the drying requirements. Traditional gas-fired, coal-fired and other fuel-burning dryers have the following disadvantages: their combustion consumes a lot of energy and produces CO 2 and other greenhouse gases, and during the drying process, the temperature of the material at different positions varies greatly, the color consistency of the baked product is poor, and the energy utilization rate of fuel combustion is low, which is not conducive to energy saving and environmental protection

[0004] In order to solve the above problems, there are existing technical solutions that use heat pump units to dry materials. However, traditional heat pump units dry materials in severe cold areas, which may easily cause unstable operation of the compressor and affect the power of the compressor. and operating efficiency

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