At present, in agriculture, food, the chemical industry, the pottery industry, medicine, mineral processing, pulp and paper making, wood processing, and other industries, all the production processes are almost all used to dry, and the quality of drying materials depends on whether a good control of constant temperature is maintained. And the air energy heat pump drying technology is mild, close to the natural drying way, and more suitable for most agricultural products, medicinal materials, and other heat-sensitive materials.
The air energy heat pump dryer uses the reverse kano principle to absorb the heat of the air outside the drying room and transfer it to the room to achieve the temperature of the drying room, with the corresponding equipment to achieve the drying of materials. In the working process, the heat pump evaporator absorbs the heat in the air; after the compressor work, the energy is handled (transferred) to the drying room; the drying room, after repeated cycle heating, absorbs moisture in the material; and through the hot air wet or condensate drainage process, the moisture in the material realizes continuous drying.
For example, most of the current production of dehydrated vegetables still adopts the traditional drying method—the oven—as opposed to the dragon fire road heating and drying method, which has several problems:
The drying temperature is too high. In traditional drying technology, the drying temperature is not easy to control.
The drying time is too long. Traditional drying technology involves processing 1 ton of vegetables for a long time; sometimes, because the drying effect is not good to rework, the time is longer.
Large amount of energy consumption. In traditional drying technology, the thermal efficiency is low, about 30%–60%. In the drying process, the heat of dry evaporation water accounts for about 36%, the exhaust gas loss accounts for about 58%, the dry material takes away heat, and the dryer heat loss accounts for 2% and 2%, respectively. The thermal efficiency is only 40%.
The drying temperature can be adjusted according to the material.
The drying time is short. Air energy heat pump drying is a dehydration material production process where the time required is half that of traditional drying.
Good drying quality. In the air energy heat pump drying process of material production, the product color is good and has stable internal quality.
Low energy volume. Because the air energy heat pump drying process uses air circulation, the heating temperature is determined according to the material, the drying time is short, and the capacity is large. So the heat pump drying process has less energy consumption, which is a very good energy-saving product.
The economic and technical indicators of air energy heat pump drying technology are much higher than those of traditional drying technology, mainly reflected in energy savings, quality, efficiency, and other aspects.
According to the test, the air-energy heat pump dryer is 90% less energy-intensive than the traditional dryer.
Air energy heat pump drying process, stable product quality, good color, no SO2 and other dew residual substances.
The use of air energy heat pumps to dry products; the moisture content is qualified; there is no rework phenomenon; and the drying time is short.