Analysis on the Application of Eight Kinds of Drying Equipment in Chemical Industry

Source: | Date: 2017-03-06 | Hits:
Drying equipment in the use of the industry is very extensive, many areas need to use the use of drying equipment, the same, drying equipment in the pharmaceutical industry also plays an important role. Today, I will bring eight kinds of drying equipment in the chemical and pharmaceutical industry in the application. Analysis on the Application of Eight Kinds of Drying Equipment in Chemical Industry.
(1) belt dryer
The belt dryer consists of several independent unit segments. Each unit section includes a circulating fan, a heating device, a separate or common fresh air extraction system and an exhaust gas extraction system. On the drying medium quantity, temperature, humidity and exhaust gas circulation operating parameters, can be independently controlled, so as to ensure the reliability of working with dry and operating conditions optimization. With a dry machine operation flexible, wet material feed, drying process in a completely sealed box, the working conditions are better, to avoid the leakage of dust. For the better permeability of flakes, strips, granular materials, dry, for dehydrated vegetables, Chinese medicine Pieces and other high water content and material temperature is not allowed to high material is particularly appropriate.
(2) drum scraper dryer
Roller scraper dryer is through the rotation of the cylinder, in a heat conduction way, will be attached to the outer wall of the liquid phase material or ribbon material, dry a continuous operation of equipment. The material to be dried is passed from the upper tank into the receptacle of the drum dryer. The drying drum is driven at the specified speed by the drive. Material from the cloth film device, in the drum wall to form a film. The cylinder continuously into the heating medium, heating the cylinder, the heat transfer from the tube wall of the wet film vaporization, and then through the scraper will reach the dry requirements of the material scraped by the screw conveyor to the tank, the packaging. Evaporation of moisture removed, depending on its nature through the closed cover, into the corresponding treatment device; generally water vapor, can be directly from the top of the exhaust pipe into the atmosphere. The machine is mainly used for processing liquid materials, either through the steam, hot water or hot oil heating and drying, but also access to cold water cooling knot. According to the different material properties and process requirements using immersion, spray, grinding and other feeding methods.
(3) hollow paddle dryer (blade dryer)
Hollow paddle dryer, also known as leaf dryer, mainly by the jacket with the W-shaped shell and two hollow blade shaft and transmission components. A hollow blade is arranged on the shaft and a rotary joint with a heat medium inlet is provided at the shaft end. The heat required to dry the moisture is conducted to the material by the inner wall of the W-shaped groove with the jacket and the hollow leaf wall. Material During the drying process, the hollow shaft with hollow blades is heated while the material is heated, and the heating surface is updated. Is a continuous conduction heating dryer. The heating medium is steam, hot water or heat transfer oil. The heating medium is passed into the shell jacket and two hollow blade shafts, and the material is heated and dried in the way of conduction heating. The structure of the different material hollow blade shaft is different. The machine is suitable for dealing with various paste paste, granular, powder and other good thermal stability of the material, under special conditions can also be dry heat-sensitive materials and in the drying process to recover the solvent. Commonly used in carbon black, light calcium carbonate, titanium dioxide, barium carbonate, nitrile, gypsum, clay, manganese dioxide, nylon and polyester chips, polyethylene, polypropylene (recovery solvent) and other materials drying or cooling.
(4) vacuum rake dryer
The dry material is fed from the top of the vacuum rake dryer, and the surface is constantly updated while the material is in contact with the shell wall under the agitation of the rotating rake. The dried material is subjected to steam (or hot water, ) Indirect heating, but the material moisture vaporization, vaporized moisture from the vacuum pump in time to take away. The dried material is indirectly heated by the heat carrier so that the moisture in the material is vaporized and the vaporized moisture is discharged from the vacuum pump in time.
As the operating vacuum is high, generally in the range of 400 ~ 700mmHg, the dry material surface water vapor pressure is much larger than the evaporator shell evaporation space of water vapor pressure. Which is conducive to the dry material within the moisture and surface water discharge, is conducive to the dry material of water molecules movement, to achieve the purpose of drying. Vacuum rake dryer for heat-sensitive, easy to oxidize the material at high temperatures or when the material is easy to dry, and the exhaust of the steam to be recycled materials. Typical dry materials are sodium propylene sulfonate, CMC, phthalocyanine blue, dye intermediates, carboxymethyl starch, maltodextrin, anthraquinone sulfonic acid and so on.
(5) double cone rotary vacuum dryer
Double cone rotary vacuum dryer slightly like olive-like, both ends of the cover, the middle of the two shafts to support the body. The body has a jacket to heat, dry body can be rotated, so that the material and the wall often replace the contact, to overcome the vacuum oven material mainly rely on heating tube conduction and low thermal efficiency shortcomings. Rotary vacuum dryer in the fine chemical, pharmaceutical and other aspects have been widely used, the viscosity of the rotation or in the process of strong adhesion of the material does not apply. The equipment is mainly used for pharmaceutical, chemical, food and other industries powder, granular and fibrous material concentration, mixing, drying and low temperature drying materials (such as biochemical products, etc.), more suitable for easy oxidation, volatile, Strongly irritating, toxic materials and materials that do not allow damage to the crystal.
(6) spray dryer
Spray drying is the most widely used process in liquid process forming and drying. It is suitable for the production of powdered, granular solid products from solutions, emulsions, suspensions and pasty liquid feedstocks. Therefore, spray drying is a very desirable process when the particle size distribution, residual moisture content, bulk density and particle shape of the finished product must meet the exact criteria.
(7) vacuum oven
As a result of decompression, the evaporation of volatile matter contained in the material can be reduced, suitable for a variety of thermal, easy oxidation of dry material. This device is often a cylinder or other vacuum can be handled by the shell, within the electric or hot water, heat conduction oil through the heating plate or heating pipe for heating, for small batch intermittent production.
Oven is a general drying equipment, for a wide range of applications, is a shelf-type intermittent drying equipment, used in pharmaceutical, chemical, food. Light industry, heavy industry and other industries materials and products of heat curing, drying dehydration. Such as raw materials, raw medicine, Chinese medicine Pieces, extract, powder, granules, granules, water pills, bottles, pigments, dehydrated vegetables, dried fruit, sausage, plastic resin, electrical components, baking paint.
(8) Rotating flash dryer
The dried material is passed through a screw inlet into the drying chamber, crushed by the stirring blade in the lower part of the dryer, and the pulverized material is in full contact with the hot air and flows upward and dry under the dual action of the stirring paddle and the air flow distributor. Filter the size and humidity of the qualified material to turn down dry until qualified.
Features: fast drying speed. 1-10 seconds to complete the dryer; material retention time can be adjusted. Can be adjusted between 1-500s, suitable for the drying of heat-sensitive materials; a variety of feeding devices for the choice of continuous feeding stability, will not produce bridging phenomenon; drying room circumferential high gas velocity, material retention time is short, effectively prevent the material Sticky wall and heat-sensitive materials metamorphic; drying chamber with grading ring and cyclone, fineness of the material and the final water adjustable and controllable; high dry strength.
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