Vacuum dryer

The vacuum dryer consists of a refrigeration system, a vacuum system, a heating system, and an electrical instrument control system. The main components are drying ovens, condensers, refrigeration units, vacuum pumps, heating/cooling devices, etc. Its working principle is to freeze the items to be dried below the triple point temperature, and then vacuum the solid water (ice) in the product to directly sublimate into water vapor, remove from the items, and make the items dry. After the material is pre-treated, it is sent to a quick-freezing chamber for freezing, then sent to a drying warehouse for sublimation and dehydration, and then packaged in a post-processing workshop. The vacuum system establishes a low pressure condition for the sublimation drying chamber, the heating system provides the sublimation latent heat to the material, and the refrigeration system provides the required coldness to the cold trap and the drying chamber.

The equipment adopts high-efficiency radiant heating, and the material is heated evenly; the high-efficiency catching cold trap is adopted, and the quick defrosting can be realized; the high-efficiency vacuum unit is adopted, and the oil-water separation can be realized; the parallel centralized refrigeration system is adopted, and the multiple-way on-demand cooling is provided, the working condition is stable , Advantageous energy-saving; artificial intelligence control, high control accuracy, easy operation. The quality requirements for freeze-dried products are: constant biological activity, uniform appearance, color, full shape, firm structure, fast dissolution rate, and low residual moisture. To obtain high-quality products, we should have a more comprehensive understanding of the theory and process of freeze-drying. The lyophilization vacuum drying process includes three stages of pre-freezing, sublimation and re-freezing. Reasonably and effectively shortening the cycle of lyophilization has obvious economic value in industrial production. The vacuum dryer passes a thermal energy source (such as hot water, low pressure steam or heat transfer oil) in the sealed interlayer, and heat is transferred from the inner shell to the dried material. Under the drive of power, the tank body rotates slowly, and the materials in the tank are continuously mixed to achieve the purpose of strengthening and drying. The material is in a vacuum state, and the atmospheric pressure drops to saturate the water (solvent) on the surface of the material and evaporate, and is discharged by the vacuum pump in time.

The water (solvent) inside the material continuously penetrates, evaporates, and discharges to the surface. The three processes are continuously performed and the material is dried in a short time. The equipment consists of barrel and frame, size hollow heating plate, main shaft, cross arm and spur leaf, disc feeder, blanking plate and finished product outlet, exhaust gas outlet, heat carrier inlet and outlet pipe, inspection door, worm gear reducer, no Stage transmissions and motors. The main component of the equipment is a hollow heating plate. The hollow section is welded with a baffle plate to strengthen it. It not only increases the stiffness and strength, but also improves the heat transfer effect, and it has the advantage of high utilization of conduction drying heat energy.

Mechanical Classification Double Cone Rotary Vacuum Dryer Double Cone Rotary Vacuum Dryer Suitable for the concentration, mixing and drying of powdery, granular, and fibrous materials in the chemical, pharmaceutical, food, and other industries (such as biochemical products, etc.) It is more suitable for drying of materials that are easy to oxidize, volatile, sensitive to heat-sensitive, toxic materials, and materials that are not allowed to destroy crystals. The use of two-stage belt/chain elastic coupling means that the equipment runs smoothly. The specially designed process fully embodies the good concentricity of the two shafts. The heat medium and the vacuum system all use reliable mechanical seals or American technology rotary joints. The machine can be stepless speed regulation, but also can be thermostatic control. Thermal media is readily available from high-temperature heat transfer oils, medium-temperature steam, and low-temperature hot water. When drying the viscous material, the "copy board" structure will be specially designed for you in the tank.

Vacuum rake dryer Vacuum rake dryer is a conductive heat transfer dryer. The material is not in direct contact with the heating medium and is suitable for drying a small amount of mud-like and paste-like materials that are not resistant to high temperatures and are easily oxidized. The moisture content is 15% to 90%. The blades of the horizontal jaw stirrer in the dryer are made of cast iron or steel and are mounted on a square shaft with half of the blades facing left and the other half facing right. The rotation speed of the shaft is 7~8r/min, which is driven by a motor with a reduction gear box. At the same time, an automatic steering device is used to change the rotation direction of the shaft and change the rotation direction of the stirrer every 5-8 minutes.

Plate-type vacuum dryer Plate-type vacuum dryer, also known as tray-type vacuum dryer, was introduced in Japan's dry monograph. China's Shanghai, Shijiazhuang and other places have been successfully developed. It is a multi-layer fixed hollow heating disk (also called loading tray), which is based on the intermittent stirring of the conductive dryer, a series of advanced technologies, and has been developed through continuous improvement. Conductive drying device.

Low-temperature belt type continuous vacuum dryer The low-temperature belt type continuous vacuum dryer is a new concept of high-efficiency and energy-saving drying equipment successfully developed in traditional Chinese medicine after repeated comparison of the advantages and disadvantages of conventional spray drying and freeze drying. In the drying of products such as western medicine, chemical industry, food, health care products and other industries, spray drying is beneficial to the cost, but the solubility of the product. The original flavor and the shape of the powder have large defects, and they are powerless for products with slightly higher viscosity and heat-sensitive properties. Conventional freeze-drying can result in excellent product solubility and high quality products, but the yield is too low and expensive.

The technical indicators of the low-temperature continuous vacuum dryer are just in between the above two kinds of equipment, which can make the interior of the dried product porous and loose, retain the original material properties of the product, and have a good appearance. Because it is vacuum and low-temperature drying, it can To meet the processing requirements of a large part of heat-sensitive materials.

The low-temperature continuous vacuum dryer breaks through the technical problems of continuous feeding and discharging under vacuum conditions, and successfully transforms static drying into dynamic drying. While greatly increasing the output of dry products, it also led to an overall decline in production costs.

The low temperature continuous vacuum dryer is particularly suitable for spray drying and high viscosity and high fat in vacuum ovens. Drying of high sugars and other materials. And can well maintain the stability and consistency of product batches.

Continuous vacuum dryer Freeze drying is a technology that uses the principle of sublimation to dry. It freezes the material to be dried at a low temperature. Then, under the proper vacuum environment, the frozen water molecules are directly sublimated into water vapor. Out of the process. The product obtained by freeze-drying is called a lyophilizer. This process is called lyophilization.

Before the material is dried, it is always at a low temperature (frozen state). At the same time, ice crystals are evenly distributed in the material. The sublimation process does not occur due to dehydration and avoids side effects such as bubbles and oxidation caused by water vapor. The dry substance is dry porous sponge, the volume is basically the same, easily soluble in water and restore the original state. To prevent physicochemical and biological degeneration of dry matter to a maximum extent.

There are heat carrier inlet and outlet pipes on each heating plate. Generally, the upper layers are made of low-pressure saturated steam or hot water, hot oil in series, parallel or series-parallel input heating to control the temperature of each layer, and the bottom two layers are connected to cooling water. To reduce the product temperature, recover heat and ensure quality. The heating plate is fixed on the cylinder frame at a certain distance and is placed horizontally. The cross arm frame is installed on each floor. The two upper and lower layers are staggered at an angle of 45° and are fixed on the center spindle. The worm gear reducer and continuously variable transmission are used. Driven by a motor or the like, slowly rotates at 0.6 to 3.7 (r/min). Each arm rack is equipped with multiple detachable jaw plow blades or flat screeds arranged in a equidistant manner. The hinge adopts the hinge and the reed swing structure so that the bottom edge floats on the surface of the disk, and the angle of the lobe can be arbitrarily adjusted according to the properties of the material to ensure that the material continuously advances on the surface of the disk.

The material to be dried is continuously fed from the top disc feeder to the inner ring surface of the uppermost first layer of the heating plate in the equipment. Under the mechanical action of the rotary lobe, it is tumbling and stirring while moving continuously from inside to outside. , Serrated to cover the entire surface of the disk, get contact heating and drying; then the material fell from the outer edge to the lower surface of the second layer of the large heating plate outer disk surface, under the action of the reverse installation of the lobe, but also from outside to inside in sequence To the inner edge, fell to the inner surface of the third heating plate. By analogy, the material is moved layer by layer from top to bottom and continuously heated and dried.

The evaporated moisture is naturally discharged from the upper outlet by mixing with the exhaust gas in the equipment. Finally, the dry material falls onto the lower plate and is scraped by the loquat leaves to the discharge port at the bottom to obtain a qualified dry product. According to the product performance, drying requirements and the amount of processing, the plate dryer adopts a series of measures such as stepless speed regulation of the spindle, manual adjustment of the height of the disc feeder adjustment sleeve, control of the temperature distribution of the heating plate in each layer, and cooling and cooling in the final stage. Plate dryer superior performance.

Technical characteristics 1. Continuous feeding and discharging can be realized under vacuum state, and the feeding amount can be freely set as required.

2. The heating system can use steam, hot water and electric heating to transfer heat oil heating and other forms.

3. The drying temperature is arbitrarily adjusted from 25°C to 80°C, and the continuous discharge is started after 20 minutes to 60 minutes until the batch is completed.

4. Teflon material is used for the crawler track, which is stable, reliable and uniform in heating area. Track speed can be arbitrarily adjusted the number of layers 2-5, can be determined according to the user's production requirements.

5. A variety of cloth devices can be used to dry various types of materials such as liquids, extracts, powders and granules.

6. Equipped with automatic crushing system under vacuum conditions, the number of dry granules can be arbitrarily selected according to the user's requirements.

7. With CIP cleaning system in place, automatic cleaning is quick and convenient.

8. The high-quality vacuum unit is selected and carefully designed and combined, with continuous large-capacity pumping rate and stable vacuum degree.

9. Low energy consumption, no waste, low noise.

10. Full compliance with GMP certification requirements.

The main advantage of a full set of processes using automation, pipeline, continuous, procedural.

The drying process is completed in a vacuum at a low temperature, and the heat-sensitive material is invariant and has no chance of contamination.

Suitable for drying of various difficult materials.

The dryness of the material (moisture content) is adjustable.

The energy consumption is only one third of the centrifugal sprayer with the same output.

PLC touch screen operation control, and continuous protection device.

The machine is reasonable in design, compact in structure, easy to install and debug, and can be installed under most working conditions.