Heat pump drying equipment popular in dehydrated fruits and vegetables industry
The difference between the Chinese drying network network heat pump drying equipment and the traditional hot air drying is that the air circulation method is different, and the way of dehumidifying the air in the drying chamber is also different. The heat pump drying and drying technology utilizes the refrigerant evaporated in the evaporator under reduced pressure to make the surface temperature of the evaporator lower than the indoor air dew point. After the heat absorption temperature rises, it is discharged in a dry state and mixed with the air sent into the room, thereby reducing the indoor temperature. Air humidity reaches the purpose of drying and dehydration. High-temperature heat pump drying equipment 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. 2. The drying time is too long. Occasionally, reheating and drying are caused by rework due to poor drying effect. 3, large energy consumption. The traditional drying process has low thermal efficiency, and the dry material takes away more heat and heat loss from the dryer. And the heat pump drying apparatus having a dewatering vegetable lines, no noise pollution, environmental protection, operating cost savings, the drying of the material during deformation, discoloration, no deterioration, drying thoroughly, nutrient loss is small, etc., it is widely applied to the tobacco drying Dried, dragon fruit, raisins, litchi, longan, slag, red dates, walnuts, bran, etc. 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. News link: High-temperature heat pump drying equipment needs a large amount of heat to be used in the drying process. To save energy, some high-humidity materials, suspensions or solutions containing solid materials are generally first mechanically dehydrated or heated to vaporize, and then dried in a desiccator to obtain Dry solids. During the drying process, the heat and mass (moisture content) transfer must be completed at the same time to ensure that the moisture partial pressure (concentration) of the moisture on the surface of the material is higher than the moisture partial pressure in the external space and the heat source temperature is higher than the material temperature. The heat is transferred from the high temperature heat source to the wet material in various ways, vaporizes the surface of the material and escapes to the external space, so that the difference in moisture content occurs on the surface and inside of the material. The internal moisture spreads to the surface and vaporizes, so that the moisture content of the material is continuously reduced, and the overall drying of the material is gradually completed. The drying rate of the material depends on the surface vaporization rate and the diffusion rate of internal moisture. Generally, the drying rate in the early drying stage is controlled by the surface vaporization rate; then, as long as the external conditions of drying are not changed, the drying rate and surface temperature of the material remain stable. This stage is called the constant-rate drying stage; when the moisture content of the material is reduced to a certain level To a certain extent, when the diffusion rate of internal moisture to the surface decreases and is less than the surface vaporization rate, the drying rate is mainly determined by the internal diffusion rate, and is continuously decreased with the decrease of the moisture content. This stage is called the deceleration drying stage. In addition, technological progress will reverse the current domestic export situation of drying equipment. At present, China's drying equipment has not yet formed an export scale, and its export volume is still less than 5% of the total, and it is mainly exported to Southeast Asia. However, according to authoritative forecasts, with the development of technology, the proportion of China's export drying equipment in total output will increase from 5% to 10% in the next few years, and the export market will also expand from Southeast Asia to Europe and the United States. The large gap between the domestic large-scale drying equipment manufacturing and the international level is expected to improve. Aluminum Round Bar,Aluminum Flat Bar,Aluminium Square Bar Jiangyin Kaxite Energy-Saving Materials Technology Co., Ltd , http://www.challaluminum.com
