Integrated air source heat pump dryer

Abstract

The invention discloses an integrated air source heat pump dryer in the field of grain processing equipment. The integrated air source heat pump dryer comprises a dryer tower body, an evaporator, a compressor, a condenser, an expansion valve, a dryer, an air feeder, a dust remover and a hot water pump; the evaporator, the compressor, the condenser and the expansion valve are connected to form a heat pump system; the air feeder, the evaporator, the dryer and the dust remover are connected to form a drying air circulation system; a preheating plate which is spirally distributed from top to bottom is arranged in the dryer tower body; a grain falling slide way is arranged on the surface of the preheating plate; a water flow pipeline is arranged in the preheating plate; and the preheating plate, the condenser and the hot water pump are connected to form a hot water circulation system. According to the invention, wet grains are heated through the hot water circulation system, and moisture in the grains is promoted to be evaporated and discharged; then the heated grains are purged through the drying air circulation system; the integrated air source heat pump dryer has the advantages of being high in heating efficiency and good in drying effect; the cold air drying dehydration amount is large, and therefore the grain color, shape, texture and nutritive value are well protected; and the integrated air source heat pump dryer is suitable for grain drying.

Description

technical field [0001] The invention relates to the field of grain processing equipment, in particular to an integrated air source heat pump drying device. Background technique [0002] The concentration of mature grain is relatively concentrated. The newly harvested grain has a large amount and contains a lot of water. It is not easy to achieve centralized drying. If it is not dried in time, it will easily mildew and cause losses. The existing grain drying equipment usually uses coal, oil, wood or Straw is used as a combustion material. These materials will produce a lot of smoke and exhaust gas during the combustion process, which will cause great pollution to the environment and the dried grain itself. The combustion is uncontrollable, which may easily cause fires and safety accidents. [0003] Heat pump drying technology is a new type of grain drying technology, which can retain the nutrients in the dry matter to the greatest extent without destroying its original struct...

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Problems solved by technology

Due to the large size of many heat pump drying equipment, the installation location needs to be reserved in advance. The installation site is large and most of the work needs to be completed on site, so the installation is more complicated. When the heat pump drying equipment is working, the refrigerant is pressurized by the compressor and becomes high temperature. The high-pressure gas (temperature up to 100°C), condensed and liquefied by the refrigerant in the condenser releases high-temperature heat to heat the air in the drying room. Sometimes the heat pump unit is overloaded due to the external environment and may not reach the ideal heating temperature, so when entering the drying It is necessary to preheat the grain before drying in the machine; in addition, in the traditional hot air drying operation, the grain always enters the dryer from the same drop point, and will form accumulations and pile up on each other when entering the dryer. The uneven heating of the grains leads to poor drying effect, and the heating on one side during drying leads to uneven heating, and the collisions between the grains and the dryer or the collisions between the grains will cause the grains to be broken to varying degrees. Affect the quality of dried products; for some grains, especially those that have texture requirements such as shape and color, high-temperature drying may have certain effects, such as affecting product appearance and reducing taste experience

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