Interpretation of the application skills of conductive heat transfer drying equipment in pharmacy
The conduction drying method indirectly transfers the heat required for drying through a surface such as a metal. The drying rate is lower than the direct drying method. The product temperature during constant-speed drying has no relationship with the temperature of the heating source, and is substantially the same as the saturation temperature of the gas pressure in the apparatus. In order to increase the drying rate and prevent uneven drying, mechanical agitation or the rotation of the container itself is usually used to increase or continuously update the heat transfer surface of the material, so it is necessary to further study the adhesion problem of the heat transfer mechanism. The drying unit itself is expensive, but it is characterized by a small load on the dust collecting system, high thermal efficiency, easy recovery of the solvent, and the total cost is much cheaper than the direct drying method.
(1) Belt dryer The belt dryer consists of several independent unit sections. Each unit section includes a circulating fan, a heating device, a separate or common fresh air intake system, and an exhaust gas exhaust system. The operating parameters of the amount of drying medium, temperature, humidity and exhaust gas circulation can be independently controlled to ensure the reliability of the operation of the dryer and the optimization of operating conditions. With dry machine operation flexible, wet material feeding, drying process in a completely sealed box, labor conditions are better, to avoid the leakage of dust. It is used for the drying of flake, strip and granular materials with good gas permeability. It is especially suitable for materials with high water content and high temperature of materials.
(2) Roller Scraper Dryer The drum scraper dryer is a continuous operation device for drying a liquid material or a strip material attached to the outer wall of the cylinder by means of a rotating cylinder by heat conduction. The liquid to be dried is flowed from the high level tank into the receiving tank of the drum dryer. The drying drum is driven by the transmission and rotates at a specified speed. The material is formed by a film coating device to form a film on the wall surface of the drum. The cylinder is continuously fed into the heating medium to heat the cylinder body, and the moisture of the film is vaporized by the heat transfer of the cylinder wall, and then the material that meets the drying requirement is scraped off by a scraper, and is spirally conveyed into the storage tank for packaging. The moisture removed by evaporation, depending on its nature, can be introduced into the corresponding treatment device through a closed hood; typically water vapor, which can be directly discharged into the atmosphere by an exhaust pipe at the top of the hood. The machine is mainly used for the treatment of liquid materials, which can be heated and dried by steam, hot water or hot oil, and can be cooled by cold water. According to different material properties and process requirements, immersion, spray, and milled auxiliary feeding methods can be adopted.
(3) Hollow paddle dryer (blade dryer)
The hollow blade dryer, also known as the blade dryer, is mainly composed of a W-shaped casing with a jacket and two hollow blade shafts and a transmission device. Hollow blades are arranged on the shaft, and the rotary end of the heat medium is introduced at the shaft end. The heat required to dry the moisture is conducted to the material by the inner wall of the jacketed W-shaped groove and the hollow blade wall. During the drying process, the hollow shaft with hollow blades agitates the material while heating the material, thereby updating the heating surface. It is a continuous conduction heating dryer. The heating medium is steam, hot water or heat transfer oil. The heating medium is introduced into the casing jacket and the two hollow blade shafts, and the materials are heated and dried by conduction heating, and the hollow shaft structure of different materials is different. Vortex Flowmeter This machine is suitable for processing various materials with good thermal stability such as paste, granule and powder. It can also dry heat sensitive materials under special conditions and recover solvent during drying process. It is commonly used for drying or cooling materials such as carbon black, light calcium carbonate, titanium dioxide, barium carbonate, nitrile uric acid, gypsum, clay, manganese dioxide, nylon and polyester chips, polyethylene, polypropylene (recovery solvent).
(4) The vacuum drier dryer is added from the top of the casing of the vacuum kneading dryer. Under the stirring of the rotating caries, the surface is continuously updated when the material is in contact with the casing wall, and the dried material is subjected to Steam (or hot water, heat transfer oil) is heated indirectly, but the material moisture is vaporized, and the vaporized water is pumped away by the vacuum pump in time. The material to be dried is indirectly heated by the heat carrier to vaporize the water in the material, and the vaporized water is discharged by the vacuum pump in time.
(1) Belt dryer The belt dryer consists of several independent unit sections. Each unit section includes a circulating fan, a heating device, a separate or common fresh air intake system, and an exhaust gas exhaust system. The operating parameters of the amount of drying medium, temperature, humidity and exhaust gas circulation can be independently controlled to ensure the reliability of the operation of the dryer and the optimization of operating conditions. With dry machine operation flexible, wet material feeding, drying process in a completely sealed box, labor conditions are better, to avoid the leakage of dust. It is used for the drying of flake, strip and granular materials with good gas permeability. It is especially suitable for materials with high water content and high temperature of materials.
(2) Roller Scraper Dryer The drum scraper dryer is a continuous operation device for drying a liquid material or a strip material attached to the outer wall of the cylinder by means of a rotating cylinder by heat conduction. The liquid to be dried is flowed from the high level tank into the receiving tank of the drum dryer. The drying drum is driven by the transmission and rotates at a specified speed. The material is formed by a film coating device to form a film on the wall surface of the drum. The cylinder is continuously fed into the heating medium to heat the cylinder body, and the moisture of the film is vaporized by the heat transfer of the cylinder wall, and then the material that meets the drying requirement is scraped off by a scraper, and is spirally conveyed into the storage tank for packaging. The moisture removed by evaporation, depending on its nature, can be introduced into the corresponding treatment device through a closed hood; typically water vapor, which can be directly discharged into the atmosphere by an exhaust pipe at the top of the hood. The machine is mainly used for the treatment of liquid materials, which can be heated and dried by steam, hot water or hot oil, and can be cooled by cold water. According to different material properties and process requirements, immersion, spray, and milled auxiliary feeding methods can be adopted.
(3) Hollow paddle dryer (blade dryer)
The hollow blade dryer, also known as the blade dryer, is mainly composed of a W-shaped casing with a jacket and two hollow blade shafts and a transmission device. Hollow blades are arranged on the shaft, and the rotary end of the heat medium is introduced at the shaft end. The heat required to dry the moisture is conducted to the material by the inner wall of the jacketed W-shaped groove and the hollow blade wall. During the drying process, the hollow shaft with hollow blades agitates the material while heating the material, thereby updating the heating surface. It is a continuous conduction heating dryer. The heating medium is steam, hot water or heat transfer oil. The heating medium is introduced into the casing jacket and the two hollow blade shafts, and the materials are heated and dried by conduction heating, and the hollow shaft structure of different materials is different. Vortex Flowmeter This machine is suitable for processing various materials with good thermal stability such as paste, granule and powder. It can also dry heat sensitive materials under special conditions and recover solvent during drying process. It is commonly used for drying or cooling materials such as carbon black, light calcium carbonate, titanium dioxide, barium carbonate, nitrile uric acid, gypsum, clay, manganese dioxide, nylon and polyester chips, polyethylene, polypropylene (recovery solvent).
(4) The vacuum drier dryer is added from the top of the casing of the vacuum kneading dryer. Under the stirring of the rotating caries, the surface is continuously updated when the material is in contact with the casing wall, and the dried material is subjected to Steam (or hot water, heat transfer oil) is heated indirectly, but the material moisture is vaporized, and the vaporized water is pumped away by the vacuum pump in time. The material to be dried is indirectly heated by the heat carrier to vaporize the water in the material, and the vaporized water is discharged by the vacuum pump in time.
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