Need help? 24 hours online : +8613916614261


Welcome to our Online Store!



vacuum dryer equipment classification and application

1. Characteristics of food vacuum drying equipment


The vacuum drying equipment is based on such a basic principle: the saturated vapor pressure of water is closely related to the temperature. In the vacuum state, the boiling point of water is reduced, that is to say, it is operated in the vacuum, that is, it is operated in the low temperature, which can avoid the destruction of the nutrients and vitamins under the high temperature, and improve the drying speed. In addition, in the vacuum system, the air content per unit volume is lower than that in the atmosphere. In this relatively anoxic environment, food drying can reduce or even avoid the oxidation opportunity of fat in food, pigment browning or other oxidation deterioration, etc., so vacuum drying can obtain better food quality. To be careful


2. Traditional vacuum drying equipment


Vacuum drying has a wide range of applications in food, pharmaceutical, chemical and other industries, and various vacuum drying equipment has been developed and introduced in China, with various structural forms. In the food industry, the commonly used forms are mainly box type, double cone type vacuum dryer, belt type vacuum drying equipment, etc. These traditional vacuum drying equipment mainly uses hot air, steam or electricity to heat, and uses the principle of heat conduction, convection or radiation to transfer the heat from the outside to the inside of the material. To be careful


Vacuum disc continuous dryer


Vacuum disc continuous dryer can be used for drying low temperature heat sensitive materials, such as drugs, enzymes, etc. The whole operation process is carried out under negative pressure. The wet material is added to the quantitative feeder, and the material is evenly added to the dryer through the continuous locking device for drying. The dried material is discharged from the discharge port at the bottom of the dryer. The moisture escaping from the material is recovered by the condenser and the solvent receiving tank. To be careful


Double cone rotary vacuum dryer


It is applicable to the concentration, mixing and drying of powder, granular and fibrous materials in chemical, pharmaceutical, food and other industries, as well as materials requiring low-temperature drying (such as biochemical products, etc.), and it is more suitable for the drying of materials that are easy to oxidize, volatilize, heat sensitive, strong stimulation, toxic and materials that are not allowed to damage crystal. The two-stage elastic connection mode of belt / chain is adopted, so the operation of the equipment is stable. The specially designed process fully reflects the good concentricity of the two shafts. Reliable mechanical seal or American technology rotary joint are used for the heat medium and vacuum system. The machine can be stepless speed regulation and constant temperature control. The heat medium includes high-temperature heat conducting oil, medium temperature steam and low-temperature hot water. When drying sticky materials, we will specially design the "board" structure for you in the tank. Chinese style


Vacuum rake dryer


Vacuum rake dryer is a kind of conduction heat transfer dryer. It is suitable for drying a small amount of mud and paste materials which are not resistant to high temperature and easy to oxidize. The moisture content is 15% ~ 90%. The blades of the horizontal rake type agitator in the dryer are made of cast iron or steel, which are installed on the square shaft. One half of the blades is to the left and the other half is to the right. The rotation speed of the shaft is 7 ~ 8R / min, which is driven by the motor with reducer. At the same time, the automatic steering device is used to make the rotation direction of the shaft change once every 5-8 minutes. Chinese style

Plate vacuum dryer.jpg

Plate vacuum dryer


Plate vacuum dryer is also called disc vacuum dryer, which is introduced in the drying monograph published in Japan. Shanghai, Shijiazhuang and other places have been successfully developed. Based on the intermittent stirring and conducting dryer, a series of technologies are integrated, and through continuous improvement, a multi-layer fixed hollow heating disk (also known as the loading disk), a rotary harrow stirring, and a vertical continuous conduction oriented drying device are developed.


Continuous vacuum dryer


The low temperature belt type continuous vacuum dryer has repeatedly compared the advantages and disadvantages of conventional spray drying and freeze-drying, and has successfully developed a new concept of energy saving drying equipment. Chinese style


In the drying of Chinese traditional medicine, western medicine, chemical industry, food, health care products, spray drying is beneficial to the cost, but the solubility of products is not good. The shape of the original flavor and powder has bigger defects, and the products with higher viscosity and heat sensitivity are incapable of action. Conventional freeze-drying can provide excellent solubility and high quality products, but the output is too low and the cost is expensive. To be careful


The process indexes of the low-temperature continuous vacuum dryer are just between the above two kinds of equipment. It can make the inside of the dried products porous and loose, keep the original material properties of the products, and have a good appearance. Because of the low-temperature vacuum drying, it can meet the processing requirements of most heat sensitive materials. To be careful


The low temperature continuous vacuum dryer breaks through the technical problem of continuous feeding and discharging in vacuum state, and makes the static drying into dynamic drying successfully. It can improve the output of drying products and reduce the production cost. To be careful


Low temperature continuous vacuum dryer is especially suitable for drying high viscosity, high fat, high sugar and other materials which are difficult to be solved by spray drying and vacuum oven. And can maintain the stability and consistency of product batch. To be careful


Continuous vacuum dryer


Freeze drying is a technology that uses the principle of sublimation to dry. It is a process that quickly freezes the dried material at low temperature, and then sublimates the frozen water molecules directly into water vapor escaping under appropriate vacuum environment. The product of freeze drying is called lyophilizer, which is called lyophilization. Chinese style


The material is always in low temperature (frozen state) before drying, and ice crystals are evenly distributed in the material. The sublimation process will not be condensed due to dehydration, avoiding the side effects such as froth and oxidation caused by steam. The dry material is porous, and its volume is basically the same. It is easy to dissolve in water and return to its original state. To a large extent, it can prevent the physical and chemical and biological denaturation of dry materials. To be careful


There are heat carrier inlet and outlet pipes on the heating plates of each layer. Generally, the upper layer uses low-pressure saturated steam or hot water, hot oil in series, in parallel or in series parallel to control the temperature of each layer. The bottom two layers are connected with cooling water to reduce product temperature, recover heat and ensure quality. The heating plate is fixed on the cylinder frame at a certain distance and placed horizontally. Each layer is equipped with a cross arm frame. The upper and lower layers are staggered and fixed on the central spindle at 45 ° and driven by the worm gear reducer, CVT and motor, etc., which rotate slowly at 0.6 ~ 3.7 (R / min). Each arm is equipped with a plurality of detachable ploughshare blades or flat scrapers, which are arranged equidistant. The rake leaf adopts the structure of hinge and reed swing, so that its bottom edge floats with couple on the plate surface, and the rake leaf angle can be adjusted arbitrarily according to the material properties, so as to ensure that the material is continuously pushed forward on the plate surface. To be careful


The dried material is continuously added to the inner ring surface of the upper layer of small heating plate from the disc feeder. Under the mechanical action of the rotary rake blade, it rolls and stirs at the same time, and moves forward continuously from the inside to the outside, which is zigzag and covers the whole plate surface, contacting the heating and drying. Then the material falls from the outer edge to the lower two layers of large heating plate outer ring surface, and is installed in reverse direction Under the action of the rake leaf, it moves to the inner edge from the outside to the inside and falls to the inner ring surface of the three-layer small heating plate. In this way, the materials move layer by layer from top to bottom, heating and drying continuously. Chinese style


The evaporated moisture is mixed with the tail gas in the equipment and is naturally discharged from the upper outlet. The final dry material falls on the lower plate, and is continuously discharged from the scraper blade to the bottom discharge port to obtain qualified dry products. According to the product performance, drying requirements and processing capacity, the plate dryer adopts a series of measures, such as stepless speed regulation of the main shaft, manual adjustment of the height of the disc feeder adjusting sleeve, control of the temperature distribution of the heating plates in each layer, and cooling at the end of the period, etc., to play the advantages of the plate dryer.


Related Products

Multi stage centrifugal blower

Multi stage centrifugal blower

Product Details

Plasma Industrial Nitriding Furnace for

Plasma Industrial Nitriding Furnace for

Product Details

CL Sereis liquid ring compressor in cond

CL Sereis liquid ring compressor in cond

Product Details

Low price Industrial Circulating water v

Low price Industrial Circulating water v

Product Details