Energy conservation is the starting point for the initial application of heat pumps and is also a major advantage. The heat pump can save 40%~70% energy when drying wood at low temperature (15~45°C). The suitable temperature for drying rice is 35 to 50 °C. The temperature was low, but requires a lot of heat. The efficiency of conventional dryers is only 3% to 5%, and the efficiency of drying with heat pumps will be significantly improved. The cloth has strict requirements on the drying temperature. The heat pump drying unit not only meets this requirement, but also saves about 50% energy compared with the conventional heat pump drying unit. Heat pump drying technology is used to save up to 90% in vegetable dehydration. In recent years, more and more researchers have confirmed the energy-saving characteristics of heat pump drying units. 1. Silicone fertilizer drying: The heat pump drying unit produces 55 degrees high temperature hot air for fertilizer drying. The system is simple in operation, precise in temperature control, and stable in output, ensuring that the organic matter of the fertilizer is not decomposed by high temperature during the drying process to ensure the quality of the fertilizer. 2. Dry food: The application of heat pump drying technology to the drying of food materials has attracted more and more attention. On the one hand, in the past, the drying of heat sensitive materials such as foods was generally freeze-dried, but the drying cost was too high; on the other hand, the drying conditions of the heat pump drying were mild, the drying parameters were easy to control, and the product heat pump of similar quality to freeze-drying was obtained. When the food material is dried, the drying temperature can be adjusted within the range of -20 to 60 ° C. With proper control method, the heat pump drying system can realize freeze drying under normal pressure. Chuaeta1. (2000) applied their own designed two-stage evaporative heat pump drying system. According to different agricultural products, different drying medium temperatures were set, the quality of the obtained products was good, and the loss of color and vitamin C during the whole drying process were respectively Decrease by 87% and 20%. 3. Tobacco drying: Dongguan Keyang Energy Saving Technology Co., Ltd. has a high-temperature heat pump tobacco automatic drying system, which has been scaled up in tobacco, edible fungi and crop baking. The thermal efficiency ratio of the equipment is 1:3~5, safe and environmentally friendly. The heat pump heat is suitable for the heating of the flue-cured scale, the dense condensing and dehumidifying room and its self-control equipment have a thermal efficiency ratio of up to 5 or so. Stable, can effectively and accurately achieve the various requirements of the baking process to ensure the internal and appearance quality of tobacco leaves, the dry electricity consumption of 1kg dry tobacco leaves is only 1kW·h. Moreover, the pollution in the baking process reaches zero emissions, which can be used in one machine. As China's power supply gradually reaches affluence, the technology has broad application prospects. 4. Drying of wood Wood drying is one of the more successful areas of application of heat pump drying technology. Although drying the wood with heat pump technology takes more time than conventional airflow drying, the remarkable energy saving effect and high wood utilization make the heat pump drying method one of the main means of wood drying processing, especially suitable for those with high commercial value and difficulty in drying. Big "difficult to dry wood". In recent years, Beijing Forestry University has been devoted to the theoretical study of wood heat pump drying (1992, Zhang Shuguang; 1996, Zhang Shuguang), accumulated a large amount of experimental data and practical experience, and in actual operation, energy saving effect and drying effect are ideal. 5 grain drying Grain drying is one of the main research and application fields of heat pump drying technology. In the United States in 1950, air/air heat pumps were used to dry grains. The actual field test shows that the water removal rate of the electrothermal dry grain is about 1.1kg/kW·h, and the water removal rate of the heat pump dry grain is about 1.8kg/kW·h, which is about 40% less than the former energy consumption. . At present, heat pump drying technology in developed countries such as the United Kingdom and Germany has been widely used in the practice of grain drying and T production. 6. Drying of tea leaves Using water/water heat pump to dry tea leaves, each ton of tea consumes about 1250kW·h (equivalent to 0.45t standard fuel); while flue gas or hot air dries tea, it consumes about 1833kW·h (equivalent to 0.66t per ton of tea). Standard fuel), saving about 32% of energy. At the same time, it can control the optimal temperature state, improve the product quality and prevent excessive drying of the tea leaves. With heat pump drying technology, the loss of soluble tannic acid can be reduced by 11% to 13%. 7. Drying of seeds The low-temperature drying characteristics of the heat pump drying technology are more suitable for seed drying. The researchers used a heat pump dryer to conduct drying experiments on corn, soybean, rice and cabbage seeds. Professor Ma Yitai of Tianjin University passed the experiment of drying seeds by heat pump. The study confirmed that heat pump drying is a good seed drying method, which can ensure the dry quality of seeds, increase drying temperature, reduce the relative humidity of dry air, and reduce the initial moisture content. The drying time is shortened. In the case of low dry air flow rate, the drying air flow rate has little effect on the drying rate. The germination rate and the germination rate of the seed are most affected by the drying temperature. It is recommended that the drying temperature of the cabbage seed should not exceed 40 °C. Where conditions permit, thermal drying can be carried out in a double drying chamber and at a lower temperature for intermittent drying to improve the drying quality of the seed. Heat pump drying characteristics (1) Energy conservation Energy conservation is the starting point for the initial application of heat pumps and is also a major advantage. The heat pump can save 40%~70% energy when drying wood at low temperature (15~45°C). The suitable temperature for drying rice is 35 to 50 °C. The temperature was low, but requires a lot of heat. The efficiency of conventional dryers is only 3% to 5%, and the efficiency of drying with heat pumps will be significantly improved. The cloth has strict requirements on the drying temperature. The heat pump drying unit not only meets this requirement, but also saves about 50% energy compared with the conventional heat pump drying unit. Heat pump drying technology is used to save up to 90% in vegetable dehydration. In recent years, more and more researchers have confirmed the energy-saving characteristics of heat pump drying units. (2) Good quality of dry products Heat pump drying is a gentle drying method that is close to natural drying. The evaporation rate of surface moisture is close to the migration speed of internal moisture to the surface, so that the quality of the dried articles is good, the color is good, and the product grade is high. The aromatic volatile substances obtained by the ordinary drying method have low retention of vitamins with poor heat resistance and large color change. For example, the ginger retention rate of ginger obtained by the drum dryer is only 20%, and the retention rate of ginger by the heat pump drying is as high as 26%. VanBlarcom and Mason's tests show that even at 50 ° C, the Australian nuts that are dried by heat pump will not appear browning as described above, and can better maintain the original color, flavor and nutrients of the nuts. (3) Drying parameters are easy to control and wide adjustable range During the heat pump drying process, the temperature, humidity and circulation flow of the circulating air can be accurately and effectively controlled, and the temperature adjustment range is -20 to 100 ° C (plus auxiliary heating device), and the relative humidity adjustment range is 15% to 80%. Suitable for drying heat sensitive materials. (4) Environmentally friendly Drying of materials not only requires improved product quality and energy savings, but must also be environmentally friendly. Based on the same evaluation criteria, the effect of heat pumps on global warming is small compared to the CO2 released by electricity. Environmental friendliness is the advantage of heat pump drying. At present, foreign countries advocate the application of heat pumps to reduce CO2 emissions, which will certainly be further applied. Fresh Garlic,Peeled Garlic,Dehydrate Garlic Reiyo Foods Co., Ltd. , http://www.ytfrozenfood.com