Which heating and drying equipment is better? Of course Kehua!
Since the editor lives in a southern city, when the rainy season comes, a piece of clothing often cannot be dried for a week after washing, so the editor wants to buy a heating and drying equipment. After comparing various brands in many ways , and finally chose Kehua, the editor thinks it is not bad, so I recommend it to you! Which heating and drying equipment is better? Of course it is Kehua! Introduction to the working principle of drying equipment: Drying equipment is also called dryer and dryer. The equipment used for drying operation vaporizes and escapes the moisture (generally refers to moisture or other volatile liquid components) in the material by heating, so as to obtain a solid material with a specified moisture content. The purpose of drying is for the needs of material use or further processing. For example, the drying of wood before making wooden molds and woodware can prevent the deformation of the products, and the drying of ceramic blanks before calcining the two drying equipment can prevent the cracking of the finished products. In addition, the dried materials are also convenient for transportation and storage, such as drying the harvested grains below a certain moisture content to prevent mildew. Since natural drying is far from meeting the needs of production development, various mechanized dryers are more and more widely used. The drying process needs to consume a lot of heat energy. In order to save energy, some materials with high moisture content, suspensions or solutions containing solid substances are generally dehydrated or evaporated by heating, and then dried in a dryer to obtain dry solids. In the drying process, it is necessary to complete the transfer of heat and mass (moisture) at the same time, to ensure that the partial pressure (concentration) of the moisture vapor on the surface of the material is higher than the partial pressure of the moisture vapor in the external space, and to ensure that the temperature of the heat source is higher than the temperature of the material. The heat is transferred from the high temperature heat source to the wet material in various ways, so that the moisture on the surface of the material is vaporized and dissipated to the outside space, so that there is a difference in the moisture content between the surface and the interior of the material. The internal moisture diffuses 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. Usually, the drying rate in the early stage of drying is controlled by the surface vaporization rate; then, as long as the external drying conditions remain unchanged, the drying rate and surface temperature of the material remain stable. This stage is called the constant-speed drying stage; when the moisture content of the material decreases to a certain To a certain extent, when the diffusion rate of internal moisture to the surface decreases and is smaller than the surface vaporization rate, the drying rate is mainly determined by the internal diffusion rate, and decreases continuously with the decrease of moisture content. This stage is called the deceleration drying stage. Airflow drying equipment In addition, technological progress will also reverse the current export situation of domestic drying equipment. At present, China's drying equipment has not yet formed an export scale, and the export volume is less than 5% of the total, and it is mainly sold to Southeast Asia. However, according to authoritative forecasts, with the development of technology, the proportion of China's export drying equipment in the 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 situation that there is a big gap between the domestic large-scale drying equipment manufacturing and the international level is expected to improve. Classification of drying equipment: Equipment used for drying operations. There are many types. According to the operating pressure, it can be divided into normal pressure and reduced pressure (reduced pressure dryer is also called vacuum dryer). According to the operation method, it can be divided into batch type and continuous type. According to the drying medium, it can be divided into air, flue gas or other drying medium. According to the way of movement (material movement and drying medium flow), it can be divided into co-current, counter-current and cross-current. According to operating pressure: According to operating pressure, dryers are divided into two types: atmospheric pressure dryers and vacuum dryers. Operation under vacuum can reduce the partial pressure of moisture vapor in the space and accelerate the drying process, and can reduce the boiling point of moisture and material drying. The temperature and steam are not easy to leak out, so the vacuum dryer is suitable for drying heat-sensitive, easily oxidized, explosive and toxic materials and the occasions where moisture steam needs to be recovered. Microwave flour sterilization and drying equipment According to the heating method: According to the heating method, the dryer is divided into convection, conduction, radiation, dielectric and other types. Convective dryers, also known as direct dryers, use hot drying media to directly contact wet materials, transfer heat by convection, and take away the generated steam; conduction dryers, also known as indirect dryers, use conduction The heat source transfers heat to the wet material through the metal partition, and the generated moisture vapor can be removed by vacuum suction, a small amount of purge gas, or condensation on the surface of a separate low-temperature condenser. This type of dryer does not use drying medium, has high thermal efficiency, and the product is not polluted, but the drying capacity is limited by the heat transfer area of u200bu200bthe metal wall, the structure is also more complex, and it is often operated under vacuum; the radiant dryer uses various radiation. The device emits electromagnetic waves in a certain wavelength range, which are selectively absorbed by the surface of the wet material and then converted into heat for drying; the dielectric dryer uses the action of a high-frequency electric field to cause thermal effects inside the wet material to dry. Which heating and drying equipment is better? Of course it's Kehua! With the heating and drying equipment, I am no longer afraid that the clothes will not dry! And I also found another advantage of having the heating and drying equipment, that is, after buying new clothes, you can wash and dry them. Wear it, no longer have to wait for it to dry! If you are also tempted, you can choose Kehua!