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History of heat pump drying technology Since the 1970s, the United States, Japan, France, Germany and other countries have carried out research on heat pump drying technology. The International Energy Center (IEA) has concentrated a large number of research results on heat pump drying technology. China also introduced this technology in the 1980s. Zui is early and the application range is widely used for the drying of wood. Since the drying temperature of the heat pump is close to natural drying, it has been gradually applied to the drying of food and agricultural by-products in recent years. Among them, good economic benefits have been achieved, and the added value of products has greatly improved. In particular, the implementation of the energy conservation and environmental protection policies of the Chinese government has greatly promoted the development of heat pump drying technology.
Materials treated with heat pump drying equipment also extend from early wood drying to food processing, tea drying, tobacco drying, vegetable dehydration, fish drying, ceramic baking, sterilization and drying of pharmaceuticals and biological products, sludge treatment, Chemical raw materials and fertilizer drying and many other fields.
The principle of heat pump dryer The heat pump dryer uses the reverse Carnot principle to absorb the heat of the air and transfer it to the room to achieve the temperature improvement of the drying room, and to achieve the drying of the materials with the corresponding equipment. The heat pump dryer consists of a compressor-heat exchanger (internal unit)-throttle-heat absorber (outer unit)-compressor and other devices to form a circulation system. The refrigerant circulates in the system under the action of the compressor. It completes the gaseous boosting process in the compressor (temperature up to 100 °C), it enters the internal machine to release high-temperature heat to heat the air in the drying room, while being cooled and converted into a liquid liquid, when it runs out After the machine, the liquid quickly absorbs the heat and evaporates again into a gaseous state, while the temperature drops to minus 20 ° C - 30 ° C, when the air around the heat sink will continuously transfer heat to the refrigerant. The continuous circulation of the refrigerant realizes the transfer of the heat in the air to the temperature of the air in the heating room in the drying room.
The operating principle of the heat pump dryer is as follows: 
The heat pump dryer compares the advantages of other types of dryers, is energy efficient, and has low operating efficiency.
Corresponding to the cost of running various energy sources: 
The cost of each energy is as follows: 
It also produces a comparison of the operating cost of the 8600 Kcal calorie dryer. 
As can be seen from the above data, the operating cost of the heat pump dryer is only 30% of the electric heating dryer, 40% of the fuel dryer, and 60% of the coal-fired dryer. Moreover, the heat pump dryer does not need to consume any fuel, which saves the cost of transporting and storing fuel, and the economic benefit is more obvious.
2, safe and environmentally friendly.
The heat pump dryer is designed to achieve the purpose of drying by transferring the heat in the air to the drying room, so that only the amount of heat is transferred. There is no need to consume other fuels, that is, to avoid safety and environmental pollution problems in transportation and storage fuels. No pollutants are produced during the operation.
3, the drying effect is good.
Since the heat pump dryers are all equipped with automatic control, the operating state of the unit can be automatically adjusted according to the setting mode. The temperature rise is stable, the temperature is uniform, and the temperature difference fluctuates less. Avoid the influence of human factors on the drying quality of the fuel dryer control process.
Heat pump drying technology application case Heat pump drying technology is applied to the tobacco drying industry. Take Foshan Kechuangda Hot and Cold Equipment Manufacturing Co., Ltd. as an example to install tobacco drying in Hunan Province in 2007.
The interior of the project's tobacco barn is 8*2.7*3.16 meters, which is about 68 cubic meters. The baking capacity of the baking room: 3500~5000kg fresh smoke, which was originally baked by the drying equipment using coal as fuel. Now the heat pump drying equipment is used as the heat source to bake the tobacco. Foshan Kechuangda Hot and Cold Equipment Manufacturing Co., Ltd. has configured two PAKA-180D (3P) heat pump drying units according to the project conditions.
Observed from the use situation, the PAKA heat pump dryer has been operating normally and is not easily affected by the weather environment. The unit is safe, reliable and easy to operate. Both farmers and tobacco companies are satisfied with the results. The specific evaluation is as follows:
1. Safety: The original coal-fired barn uses coal as fuel to produce an open flame. It may cause smoke to burn, causing huge losses to the farmers. The PAKA heat pump toaster (including power supply) is installed outside the barn. The heat transfer from the heat pipe to the heat sink of the baking room is used for heating, so that there is no open fire in the baking room to achieve safety.
2. Environmental protection: The original coal-fired roasting house uses coal as a fuel to bake, and emits toxic gases such as carbon dioxide and sulfur dioxide to endanger human health. Other dust and smog emitted by it causes the air purity to drop drastically, and the stacking site seriously affects the surrounding environmental sanitation; The PAKA heat pump bakehouse has no emissions, no impact on the human body and the environment, and zero hazard, so that the residents of the tobacco farmers and tobacco areas completely separate from the smouldering labor and living environment.
3. Energy saving:
The original coal-fired roasting room has a uniform cost of 600 yuan for a room, and the same area of ​​PAKA heat pump is only about 420 yuan, which is 30% lower than the cost of the PAKA heat pump, and the oven is intelligently controlled. There is no need for special care, and the labor cost is reduced by about 60%.
4. High quality: The original coal-fired roasting rooms use artificial combustion combustible materials to control the temperature. Due to the fire-burning technology of the farmers, the physiological characteristics (rest), the quality of the burning materials and the processing quality affect the temperature control. The baking technology requirements lead to unstable tobacco quality. The PAKA heat pump baking room has been completely solved from the automation and precision control of the heat source, and the precise temperature control reaches ±1 °C, thus improving the baking quality of the tobacco leaves.
5. Labor saving: The original coal-fired roasting rooms are all heated by artificial burning materials, which require a large amount of labor to purchase or process fuel. When baking, it is necessary to continuously increase or reduce the material to control the temperature, so that the labor intensity of the farmers is very Big. The PAKA heat pump baking room can automatically control the temperature and drain the water without any fuel, which greatly reduces the labor intensity of the tobacco farmers, and can easily bake a number of baking rooms at the same time.
6. Time-saving: The coal-fired roasting house is slowed down due to factors such as mishandling and burning time during heating, resulting in waste of baking time. The PAKA heat pump baking room has a fast temperature, correct temperature control and program setting. The baking time is standardized, and evenly baking each room can save more than 24 hours.
The drying process of the prospective material of heat pump drying technology is a huge energy-consuming process. According to statistics, in most developed countries, the energy consumed for drying accounts for 7%-15% of the total energy consumption in the country, while the thermal efficiency is only 25%. % - 50% [26], and most of the drying process, especially for heat sensitive materials such as food and biological materials, will have an impact on its brilliance, nutrition, flavor and texture. The heat pump drying technology has the advantages of low energy consumption, low environmental pollution, high drying quality and wide application range, and its excellent energy saving effect has been confirmed by various experimental research institutes at home and abroad. At present, heat pump drying is developing towards new drying temperature, developing new heat pump drying system, and automatic control technology of heat pump. Heat pump drying is the same technology that can reduce energy consumption and improve product quality. A major technological revolution.
Introduction to heat pump drying technology and its application cases
The drying of the heat pump dryer is an indispensable processing process in many industrial production and agricultural and sideline products processing. As people's quality of life progresses, awareness of environmental protection is growing and the reserves of non-renewable energy sources (such as natural gas, coal, and oil) are depleting. The use of high-energy, high-pollution drying equipment such as fuel and coal is strictly limited or even prohibited. It is increasingly urgent to find a kind of drying equipment that can replace the old ones, and it is safe, environmentally friendly, energy-saving and drying equipment. Heat pump drying equipment has emerged in this environment.