Heat pump drying equipment is widely used for drying fruits and vegetables

China Drying Network News high-temperature heat pump drying and drying technology is the use of (refrigerant) evaporation in the evaporator under reduced pressure, so that the evaporator surface temperature is lower than the indoor air dew point, so that when the air flows through the evaporator is cooled down to the dew point In the following, excess steam in the air will condense and precipitate on the surface of the evaporator. After the condensation drops into the water tray, it flows into the water container from the drain pipe. After the liquid working medium absorbs heat and vaporizes, it is sent to the condenser through the compressor to do work, and the condenser emits a large amount of latent heat of vaporization under high temperature and high pressure. When the air cooled in the evaporator passes through the condenser, the endothermic temperature rises, and then it is discharged in a dry state and mixed with the air sent into the room, thereby reducing the indoor air humidity and achieving the purpose of drying and dehydrating.

At present, the dehydration vegetable production mostly adopts the traditional drying method —the heating and drying method of drying the fire in the room. It has the following problems: 1. The heating temperature is too high. Traditional technology drying technology, the heating temperature is not easy to control. Generally, the heating temperature is about 75-90°C, while the dehydrated vegetable drying process requires the drying temperature not to exceed 65°C. 2, drying time is too long. With traditional methods, it takes at least 24 hours per 1 ton of vegetables to be processed, even if this happens occasionally due to poor drying and re-heating and drying. 3, large energy consumption. The traditional drying process has a low thermal efficiency of about 30% to 60%. In the drying process, about 36% of the heat is evaporated by drying and about 58% of exhaust gas is lost. The dry material removes the heat and dryer heat. The losses accounted for 2% and 2%, respectively, and the thermal efficiency was only 40%.

High-temperature heat pump drying and drying technology has been widely applied to tobacco drying, dragon fruit flowers, raisins, lychee, longan, slag, red dates, walnuts, wolfberry, mangosteen, nuts, waxy foods, seafood, Chinese herbal medicines, turtles because of its unique characteristics. Paste powder, dried noodles, dried persimmons, tea, chrysanthemum, Ganoderma lucidum, honeysuckle, shiitake mushrooms, Cordyceps flowers, dried vegetables, dried bean curd, star anise, food thermostats, wood, furniture, feed, cocoon, rubber, slime, ore, municipal sludge, Bio-fertilizer, leather, printing, fabric printing, fireworks, paper tube, mosquito coils, laundry products, crop products, low-temperature baking paint, metal and plastic parts drying and other special industries, when used in the production of dehydrated vegetables, its advantages are: 1, heating Low temperature. The heat pump drying technology can be reduced by about 38-52°C compared to the traditional drying process, and the heating temperature of the heat pump drying process is about 37°C. 2, drying time is short. High-temperature heat pump drying dehydration vegetable production process, the maximum time required will not exceed 8h, generally from the preheat to the product 4h can be completed. 3, good quality. The vegetables produced by the high-temperature heat-pump drying process have good color and stable internal quality. 4, low energy consumption. Because this process utilizes air circulation, the heating temperature is low, the drying time is short, and the capacity is large. Therefore, the heat pump drying process consumes less energy and is a very good energy-saving product.

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Heat pump drying equipment

The investment of high-temperature heat pump drying and drying equipment has a relatively large investment cost but a greater return, which not only saves a lot of energy, but also greatly improves work efficiency. The high-temperature heat pump drying process is used for vegetable dehydration production. It is a technically feasible and economically reasonable energy-saving project. This new technology and new process is very successful from theory to practice.

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