Drying equipment is also very important in our lives. We live in a life that doesn't fall ill. The most important thing is to take medicine. This is the case in life. It is a very complicated process in the pharmaceutical industry. The drying equipment in the work is particularly important in this industry. It will introduce in detail the detailed heat transfer method used in the pharmaceutical industry. The conduction drying method indirectly transfers the heat required for drying through the metal surface. 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.
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 such as dehydrated vegetables and Chinese herbal medicines with high water content and high material temperature.
Roller Scraper Dryer: The drum scraper dryer is a continuous operation device that dries the liquid material or the 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.
Hollow paddle dryer (blade dryer): The hollow blade dryer, also known as the blade dryer, consists mainly of a W-shaped housing with a jacket and two hollow blade shafts and a transmission. 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.
The machine is suitable for processing various materials with good thermal stability such as paste, granule and powder. Under special conditions, the heat sensitive material can also be dried and the solvent can be recovered during the drying process. Commonly used for drying or cooling materials such as carbon black, light calcium carbonate, titanium ***, strontium carbonate, nitrile uric acid, gypsum, clay, manganese dioxide, nylon and polyester chips, polyethylene, polypropylene (recovery solvent) .
Vacuum kneading dryer: The dry material is added from the upper part of the top of the vacuum kneading dryer. Under the stirring of the rotating molars, when the material is in contact with the shell wall, the surface is continuously updated, and the dried material is subjected to steam ( Or hot water, heat transfer oil) indirect heating, but the material moisture vaporization, vaporized moisture 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.
Due to the high degree of operating vacuum, generally in the range of 400-700 mmHg, the water vapor pressure on the surface of the dried material is much larger than the water vapor pressure in the evaporation space in the dryer housing. Thereby, it is beneficial to the discharge of the internal moisture and the surface moisture of the dried material, and is beneficial to the movement of the water molecules of the dried material to achieve the purpose of drying. The vacuum kneading dryer is suitable for heat sensitive materials, materials that are easily oxidized at high temperatures or materials that are easy to be kneaded during drying, and materials that must be recovered from steam discharged during drying. Typical dry materials are sodium propylene sulfonate, CMC, phthalocyanine blue, dye intermediates, carboxymethyl starch, maltodextrin, hydrazine sulfonic acid and the like.
Double-cone rotary vacuum dryer: The double-cone rotary vacuum dryer is slightly olive-like, with a cover at both ends, and two shafts in the middle to support the body. The body has a jacket to heat, and the body can be rotated when dry, so that the material and the wall are frequently replaced, which overcomes the disadvantage that the material in the vacuum oven mainly passes through the heating cylinder and has low thermal efficiency. Rotary vacuum dryers have been widely used in fine chemicals and medicines, and are not suitable for materials with high viscosity or strong adhesion during the turning process. The equipment is mainly used for concentrating, mixing, drying and low-temperature drying materials (such as biochemical products) of powder, granular and fibrous materials in the pharmaceutical, chemical and food industries, and is more suitable for oxidizing, volatile and heat sensitive. Strongly irritating, toxic materials and dryness of materials that do not allow damage to the crystals.
Vacuum oven: After decompression, the evaporation temperature of the volatiles contained in the material evaporation can be reduced, which is suitable for drying various heat sensitive and easy oxide materials. This device is usually a cylinder or other vacuum-operated outer casing, which is heated by electric heating or hot water or heat-conducting oil through a heating plate or a heating pipe, and is suitable for batch production in small batches.
The oven is a general-purpose drying equipment with a wide application surface. It is a tray-type intermittent drying equipment used in pharmaceutical, chemical and food. Heat curing, drying and dehydration of materials and products in light industry, heavy industry and other industries. Such as raw materials, raw drugs, Chinese herbal medicine pieces, extracts, powders, granules, granules, water pills, packaging bottles, pigment dyes, dehydrated vegetables, dried melons, sausages, plastic resins, electrical components, baking varnish and so on.
Freeze dryer: The freeze dryer freezes and freezes the feed liquid, and then depressurizes the ice to sublimate the ice to obtain a dry material. Since the entire process is carried out below freezing point, it is often used for drying of heat sensitive articles. It is difficult to heat the frozen material under vacuum, and a large refrigeration system is required to condense the sublimated water vapor under reduced pressure, so the drying cost is large. The moisture in the highly heat sensitive material is frozen and will be maintained at a temperature below freezing below under high vacuum. The water is sublimed to separate from the material. The loss of active ingredients in the material is small, but the drying rate is low.
In the type of drying equipment, hot air heating atmospheric pressure drying equipment and vacuum drying equipment will be mainly used, and other users in special fields such as far infrared drying equipment and microwave drying equipment will gradually expand the application quantity; in food and medicine drying, The demand for larger gauge equipment in vacuum freeze-drying equipment will increase; the demand for equipment with functional combinations (such as granulation-drying, drying-filtration) will also increase; high-automatic drying equipment will be welcomed in some applications. . In addition, the appearance quality of drying equipment will receive more and more attention, and the corrosion resistance and reliable service life of corrosive material drying equipment will be of particular concern to users.
The development of the domestic drying equipment industry, as expected by experts, is both a challenge and an opportunity. As far as the domestic market is concerned, as China's drying equipment industry has begun to enter a more mature stage of development, it has been able to better meet the actual needs of users in various fields, and only 1/3 of the same foreign products in terms of price, which makes China dry. Equipment has obvious price advantage over imported equipment in market competition;
On the other hand, due to the large volume of drying equipment, most of them also involve on-site installation, commissioning and after-sales service. Therefore, for domestic users, it is more convenient to select domestic equipment than to use imported equipment. As far as the international market is concerned, after China's accession to the WTO, it is more conducive to the expansion of exports of drying equipment.
At present, the main export products of drying equipment in China are vacuum drying equipment, vibration drying equipment, small and medium-sized food, food, pharmaceutical and agricultural and forestry products drying equipment. The annual export volume exceeds 100 units. The main export areas are Southeast Asia and other developing countries. And has opened the door to the European and American markets.
China's pharmaceutical industry needs drying equipment, the development of the pharmaceutical industry can drive the development of drying equipment, while China's drying equipment meets the pharmaceutical industry, which proves that China's drying equipment has risen a step, I believe that it will soon take the initiative in the world. !
Liquid For Injection,Radix Isatidis Injection,Florfenicol Injection,Flunixin Meglumine Injection
Sichuan Aibang Weiye Biological Engineering Co., Ltd. , https://www.aibangpharm.com