Vacuum dryer mechanical principle
2021-07-07 13:06:05
A vacuum dryer mechanical principle describes a continuous vacuum dryer drying Freeze-drying is a technique using the principle of sublimation, is a substance to be dried at a low temperature rapid freezing, and then at an appropriate vacuum, so that frozen water molecules Direct sublimation becomes a process in which water vapor escapes. The product obtained by freeze drying is called a lyophilizer, and the process is called lyophilization.
The substance is always in a low temperature (freezing state) before drying, and the ice crystals are uniformly distributed in the substance, and the sublimation process does not cause concentration due to dehydration, thereby avoiding side effects such as foaming and oxidation caused by water vapor. The dry material is porous in the shape of a dry sponge, the volume is basically unchanged, and it is easily soluble in water and restored to its original state. The physicochemical and biological denaturation of dry matter is largely prevented in Zui.
There are heat carrier inlet and outlet pipes on each layer of 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 product temperature, recover heat and ensure quality. The heating plate is fixed on the frame of the cylinder at a certain interval, and is placed horizontally. Each layer is equipped with a cross arm frame, and the upper and lower layers are staggered and fixed at 45° on the central spindle, and the worm wheel reducer and the continuously variable transmission are arranged. And the motor and other drives, slowly rotate at 0.6~3.7 (r/min). Each of the booms is provided with a plurality of detachable hoe-shaped rakes or flat squeegees arranged equidistantly. The 耙 leaf adopts hinged and reed oscillating structure, so that the bottom edge floats evenly on the disk surface, and the angle of the 耙 leaf can be adjusted arbitrarily according to the material properties to ensure that the material is continuously advancing on the disk surface.
The material to be dried is continuously fed from the top disc feeder to the inner ring surface of the small heating plate on the top of the machine. Under the mechanical action of the rotary rakes, while tumbling and stirring, the product is continuously moved forward from the inside to the outside. It is zigzag covered on the entire surface of the plate and heated by contact; then the material falls from the outer edge to the outer surface of the outer layer of the second heating plate below, and is moved from the outside to the inside under the action of the reversely mounted raft leaves. The inner edge falls to the inner ring surface of the third heating plate. By analogy, the materials are moved layer by layer from top to bottom, and are continuously heated and dried.
The evaporated moisture is mixed with the exhaust gas in the equipment and naturally discharged from the upper outlet. The final dry material of the Zui falls onto the lower tray, and is continuously discharged from the raking blade to the bottom discharge opening to obtain a qualified dry product. According to product performance, drying requirements and processing capacity, the plate dryer adopts a series of steps such as stepless speed regulation of the spindle, manual adjustment of the height of the disc feeder to adjust the height of the heating plate, control of the temperature distribution of each layer of the heating plate, and final cooling and cooling. The superior performance of the plate dryer.
A vacuum dryer - Mechanical vacuum drier using microwave vacuum dryer <br> <br> system by the cooling system, vacuum system, heating system, electrical instrumentation control system components. The main components are drying ovens, condensers, refrigeration units, vacuum pumps, heating/cooling devices, etc. It works by freezing the dried item below the triple point temperature and then sublimating the solid water (ice) in the item to water vapor under vacuum conditions, removing it from the item and drying the item. After the material is pretreated, it is sent to the quick freezing warehouse for freezing, and then sent to the drying chamber for sublimation dehydration, and then packaged in the post-treatment workshop. The vacuum system establishes a low pressure condition for the sublimation drying chamber, the heating system provides sublimation latent heat to the material, and the refrigeration system provides the required cooling capacity to the cold trap and the drying chamber.
The equipment adopts high-efficiency radiant heating, the material is evenly heated; it adopts high-efficiency water trap and can realize rapid defrosting; adopts high-efficiency vacuum unit and can realize oil-water separation; adopts parallel centralized refrigeration system, multi-channel cooling on demand, stable working conditions It is beneficial to energy saving; it adopts artificial intelligence control, with high control precision and convenient operation. The quality requirements for freeze-dried products are: constant biological activity, uniform appearance and color, full shape, firm structure, fast dissolution rate and low residual moisture. To obtain high quality products, a comprehensive understanding of the theory and process of lyophilization should be obtained.
The freeze-drying vacuum drying process includes three stages of pre-freezing, sublimation and re-freezing. Reasonable and effective shortening of the freeze-drying cycle 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 the heat is transferred to the dried material in the inner casing. Under the power drive, the tank rotates slowly, and the materials in the tank are continuously mixed to achieve the purpose of strengthening drying. The material is in a vacuum state, and the atmospheric pressure drops so that the water (solvent) on the surface of the material reaches a saturated state and evaporates, 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 carried out, and the material reaches the drying purpose in a short time. The equipment mainly consists of cylinder and frame, hollow hollow heating plate, main shaft, cross arm and rakes, disc feeder, hopper tray and finished product outlet, exhaust gas outlet, heat carrier inlet and outlet pipe, inspection door, worm gear reducer, no A combination of a transmission and a motor. The main component of the equipment is a hollow heating plate, and the hollow part is welded with a baffle plate to strengthen, which not only increases the rigidity and strength, but also improves the heat transfer effect, and exerts the advantage of high utilization rate of conduction drying heat energy.
The substance is always in a low temperature (freezing state) before drying, and the ice crystals are uniformly distributed in the substance, and the sublimation process does not cause concentration due to dehydration, thereby avoiding side effects such as foaming and oxidation caused by water vapor. The dry material is porous in the shape of a dry sponge, the volume is basically unchanged, and it is easily soluble in water and restored to its original state. The physicochemical and biological denaturation of dry matter is largely prevented in Zui.
There are heat carrier inlet and outlet pipes on each layer of 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 product temperature, recover heat and ensure quality. The heating plate is fixed on the frame of the cylinder at a certain interval, and is placed horizontally. Each layer is equipped with a cross arm frame, and the upper and lower layers are staggered and fixed at 45° on the central spindle, and the worm wheel reducer and the continuously variable transmission are arranged. And the motor and other drives, slowly rotate at 0.6~3.7 (r/min). Each of the booms is provided with a plurality of detachable hoe-shaped rakes or flat squeegees arranged equidistantly. The 耙 leaf adopts hinged and reed oscillating structure, so that the bottom edge floats evenly on the disk surface, and the angle of the 耙 leaf can be adjusted arbitrarily according to the material properties to ensure that the material is continuously advancing on the disk surface.
The material to be dried is continuously fed from the top disc feeder to the inner ring surface of the small heating plate on the top of the machine. Under the mechanical action of the rotary rakes, while tumbling and stirring, the product is continuously moved forward from the inside to the outside. It is zigzag covered on the entire surface of the plate and heated by contact; then the material falls from the outer edge to the outer surface of the outer layer of the second heating plate below, and is moved from the outside to the inside under the action of the reversely mounted raft leaves. The inner edge falls to the inner ring surface of the third heating plate. By analogy, the materials are moved layer by layer from top to bottom, and are continuously heated and dried.
The evaporated moisture is mixed with the exhaust gas in the equipment and naturally discharged from the upper outlet. The final dry material of the Zui falls onto the lower tray, and is continuously discharged from the raking blade to the bottom discharge opening to obtain a qualified dry product. According to product performance, drying requirements and processing capacity, the plate dryer adopts a series of steps such as stepless speed regulation of the spindle, manual adjustment of the height of the disc feeder to adjust the height of the heating plate, control of the temperature distribution of each layer of the heating plate, and final cooling and cooling. The superior performance of the plate dryer.
A vacuum dryer - Mechanical vacuum drier using microwave vacuum dryer <br> <br> system by the cooling system, vacuum system, heating system, electrical instrumentation control system components. The main components are drying ovens, condensers, refrigeration units, vacuum pumps, heating/cooling devices, etc. It works by freezing the dried item below the triple point temperature and then sublimating the solid water (ice) in the item to water vapor under vacuum conditions, removing it from the item and drying the item. After the material is pretreated, it is sent to the quick freezing warehouse for freezing, and then sent to the drying chamber for sublimation dehydration, and then packaged in the post-treatment workshop. The vacuum system establishes a low pressure condition for the sublimation drying chamber, the heating system provides sublimation latent heat to the material, and the refrigeration system provides the required cooling capacity to the cold trap and the drying chamber.
The equipment adopts high-efficiency radiant heating, the material is evenly heated; it adopts high-efficiency water trap and can realize rapid defrosting; adopts high-efficiency vacuum unit and can realize oil-water separation; adopts parallel centralized refrigeration system, multi-channel cooling on demand, stable working conditions It is beneficial to energy saving; it adopts artificial intelligence control, with high control precision and convenient operation. The quality requirements for freeze-dried products are: constant biological activity, uniform appearance and color, full shape, firm structure, fast dissolution rate and low residual moisture. To obtain high quality products, a comprehensive understanding of the theory and process of lyophilization should be obtained.
The freeze-drying vacuum drying process includes three stages of pre-freezing, sublimation and re-freezing. Reasonable and effective shortening of the freeze-drying cycle 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 the heat is transferred to the dried material in the inner casing. Under the power drive, the tank rotates slowly, and the materials in the tank are continuously mixed to achieve the purpose of strengthening drying. The material is in a vacuum state, and the atmospheric pressure drops so that the water (solvent) on the surface of the material reaches a saturated state and evaporates, 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 carried out, and the material reaches the drying purpose in a short time. The equipment mainly consists of cylinder and frame, hollow hollow heating plate, main shaft, cross arm and rakes, disc feeder, hopper tray and finished product outlet, exhaust gas outlet, heat carrier inlet and outlet pipe, inspection door, worm gear reducer, no A combination of a transmission and a motor. The main component of the equipment is a hollow heating plate, and the hollow part is welded with a baffle plate to strengthen, which not only increases the rigidity and strength, but also improves the heat transfer effect, and exerts the advantage of high utilization rate of conduction drying heat energy.
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