Optimization of drying process parameters and process of heat pump dryer to realize intelligent operation

Principle of heat pump dryer the heat pump dryer is to use the inverse Carnot principle to absorb the heat of air and transfer it to the room, so as to improve the temperature of the drying room and achieve the drying of materials with the corresponding equipment The heat pump dryer consists of compressor - heat exchanger (internal machine) - restrictor - heat absorber (external machine) - compressor and other devices to form a circulation system (main machine + drying room) Refrigerant circulates in the system under the action of compressor It completes the process of gas pressure rise and temperature rise in the compressor (the temperature is 115 ℃), it enters the internal machine and releases high-temperature heat to heat the air in the drying room, at the same time, it is cooled and transformed into liquid flow When the heat pump dryer runs to the external machine, the liquid quickly absorbs heat and evaporates again into gas state, and the temperature drops to - 20 ℃ - 30 ℃, then the air around the heat absorber will It will continuously transfer heat to the refrigerant The continuous circulation of the refrigerant realizes the transfer of the heat in the air to the air temperature in the heating room of the drying room I heat pump dryer specification: the operation of heat pump dryer only needs one key operation This equipment uses electricity as heat source This equipment has low energy consumption, no pollution, program control, simple appearance, and can be easily mastered by ordinary users who do not understand the computer The temperature can be adjusted automatically according to the needs, and the humidity in the oven can be controlled by the automatic exhaust and dehumidification without the need of manual care The whole process is controlled by a microcomputer, saving time and labor The dryer can also be used for drying wolfberry, rhubarb, Salvia miltiorrhiza, Huzhou heat pump dryer, dangshen, ginseng, burdock, etc Besides, it can also be used for drying honeysuckle, chrysanthemum, rose, etc the heat pump dryer can also be used for drying dried bamboo shoots, fungi, garlic, flowers, dried fruits, vegetables, mushrooms, sweet potatoes, corn, peas, beans, coconuts, areca, fungus and other agricultural and sideline products Dry All materials dried by solar energy can be dried Only need to set the drying temperature and humidity according to the actual situation Second, the basic technical characteristics of the heat pump dryer is to produce drying media with different temperatures by heating There is no clear limit on the upper limit, and the ideal heating temperature is below 150 ℃ Therefore, the prospect of heat pump dryer is very considerable At present, heat pump dryer has obvious advantages in the following aspects: (1) low temperature drying Heat pump dryer has a strong comprehensive competitiveness in the field of low-temperature drying, especially for a large class of materials with a drying process temperature tolerance of 0 ℃ ~ 60 ℃, it can develop a special heat pump dryer with obvious advantages in comprehensive technology and economy for a certain kind of materials or a certain kind of materials, and gradually expand the market space of the dryer (2) drying in inert environment The heat pump dryer is mainly used for inflammable and explosive materials (the inflammable and explosive materials contain inflammable and explosive solvents, such as organic combustible powder, solid fuel, etc.), toxic and harmful materials (such as intermediates of chemical raw materials, etc.), materials with pungent smell (such as garlic juice, pepper juice, etc.), oxide materials, materials with volatile components such as fragrance to be recovered, etc., which can make use of heat The pump dryer is easy to use the advantages of inert medium (nitrogen, carbon dioxide, argon, helium, etc.) full closed cycle The special heat pump dryer realizes the safe, high-quality drying of the above materials (3) energy saving drying Heat pump dryer for the conventional dryer whose drying medium or heating surface temperature is between 60 ℃ ~ 150 ℃, on the basis of systematic technical and economic analysis, the conventional dryer is transformed into heat pump dryer by using heat pump instead of electric heating, boiler, hot blast stove, etc., greatly improving the energy efficiency of heat pump dryer, obviously reducing the drying operation cost, and the investment recovery period Generally in 1 / 2-3 / 2 year, it can optimize the drying process parameters, process, component structure, and realize the energy-saving intelligent operation of the drying device III system structure of heat pump dryer: 1 Controllable air energy heat pump dryer (main machine) 2 Polyurethane foam insulation warehouse (customized) 3 Circulating insulation air duct (supply air + return air) 4 Forced hot air circulation fan 5 Automatic intelligent control system of heat pump dryer (8-75 degrees of free adjustment)