Drying equipment in the industrial use is very extensive, in many areas need to use the drying equipment, the same, drying equipment in the pharmaceutical industry also has an important role. Today, I will bring eight kinds of drying equipment in the chemical industry. Analysis of Eight Kinds of Drying Equipment in Chemical Industry.
(1) belt dryer
Belt dryer consists of a number of independent unit sections. Each unit section includes circulating fans, heaters, separate or common fresh air intake system and exhaust system. The number of dry media, temperature, humidity and exhaust cycle operating parameters, can be independently controlled, so as to ensure the reliability and operating conditions with dry machine optimization. With dry machine flexible operation, wet material feeding, drying process in a completely sealed box, the working conditions are better, to avoid the dust leakage. For better air permeability sheet, strip, granular material drying, dehydrated vegetables, Chinese Herbal Pieces and other materials with high moisture content of the material is not high temperature is particularly suitable.
(2) drum scraper dryer
Drum scraper dryer through the rotation of the cylinder, in a thermally conductive manner, attached to the outer wall of the cylinder liquid material or strip material, a continuous operation of the drying equipment. The liquid material to be dried flows from the upper tank into the trough of the drum dryer. Drying drum driven by the transmission, according to the provisions of the rotation speed. Material from the cloth film device, forming a film on the drum wall. Continuous heating medium into the cylinder, the heating cylinder, by the cylinder wall moisture vaporization of the material film, and then through the scraper to reach the drying requirements scraped material, the screw conveyor to the storage tank for packaging. Evaporative moisture removal, depending on its nature can be sealed enclosure, into the appropriate treatment device; usually water vapor, can be directly from the top of the exhaust pipe into the atmosphere. The machine is mainly used to handle liquid materials, both access to steam, hot water or hot oil heating and drying, but also access to cold water cooling sheet. According to the different material properties and process requirements using immersion, spray, grinding auxiliary type feeding.
(3) hollow blade dryer (blade dryer)
Hollow blade dryer, also known as leaf dryer, mainly by the jacket with a W-shaped shell and two hollow blade shaft and transmission components. The shaft is lined with hollow blades, and the shaft end is equipped with a rotary joint for introducing the heat medium. 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. Materials in the drying process, the hollow shaft with hollow blades in the material while heating the material while stirring, in order to update the heating surface. Is a continuous conduction heating dryer. Heating medium is steam, hot water or HTF. The heating medium is introduced into the shell jacket and two hollow blade shafts to heat and dry the materials in a conduction heating manner. The hollow blade shafts of different materials have different structures. This machine is suitable for processing all kinds of paste, granular, powder and other materials with good thermal stability. Under special conditions, it can also dry heat-sensitive materials and recover the solvent in the drying process. Commonly used in the drying or cooling of carbon black, light calcium carbonate, titanium dioxide, barium carbonate, nitrile uric acid, gypsum, clay, manganese dioxide, nylon and polyester chips, polyethylene, polypropylene (recycled solvents) and other materials.
(4) vacuum rake dryer
Drying material from the top of the vacuum rake dryer is added above the middle of the continuous rotation of the rake teeth, the material in contact with the shell wall, the surface is constantly updated, the material being dried by steam (or hot water, heat conducting oil ) Indirect heating, but the material moisture vaporization, vaporized water in time by the vacuum pump away. The material to be dried is indirectly heated by the heat carrier, so that the moisture in the material is vaporized, and the vaporized moisture is discharged by the vacuum pump in time.
Due to the high degree of vacuum operation, usually in the range of 400 ~ 700mmHg, the water vapor pressure on the surface of the material to be dried is much larger than the water vapor pressure of the evaporation space in the dryer housing. Which is conducive to the moisture content of the material being dried and the surface of the discharge of water is conducive to the water molecules of the dried material movement, to achieve the purpose of drying. Vacuum rake dryer for heat sensitive, easy to oxidize the material at high temperatures or easy to knot when dry material, and drying the steam to be recovered from the material. Typical dry materials sodium propane 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 body slightly olive-like body, both ends of the lid, the middle set up two axes to support the body. The body has a jacket to heat, dry the body can be rotated, so that the material and the wall replacement contact frequently, to overcome the vacuum oven material mainly rely on the conduction and thermal conductivity of the shortcomings of low thermal efficiency. Rotary vacuum dryer in the fine chemicals, pharmaceuticals, etc. has been widely used, the viscosity or in the process of rotating the strong adhesion of the material does not apply. The equipment is mainly used for the concentration, mixing, drying and materials to be dried at low temperature (such as biochemical products) in the fields of medicine, chemical industry and foodstuff, more suitable for easy oxidation, volatile, heat-sensitive Strongly irritating, toxic materials and does not allow the destruction of the crystal material drying.
(6) spray dryer
Spray drying is the most widely used process in the liquid forming and drying industry. Most suitable for producing powdered, granular solid products from solutions, emulsions, suspensions and pasty liquid raw materials. 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 conform to the exact standards.
(7) vacuum oven
As a result of decompression, evaporation of volatile materials contained in the evaporation temperature can be reduced for a variety of thermal, easily oxidized material drying. This device is often the cylinder or other vacuum-operated enclosure, with electric or hot water, heat conducting oil through the heating plate or heating pipe for heating, suitable for small batches intermittent production.
Oven is a general drying equipment, suitable for a wide range of tray-type intermittent drying equipment, used in pharmaceutical, chemical, food. Light industry, heavy industry and other materials and products heating curing, dehydration. Such as APIs, crude drugs, Chinese Herbal Medicine, extract, powder, granules, granules, water pills, bottles, pigment dyes, dehydrated vegetables, dried fruits, sausages, plastic resins, electrical components, such as baking paint.
(8) spin flash dryer
The material to be dried enters the drying chamber through the screw feeder and is crushed by a stirring blade at the lower part of the dryer. The crushed material is fully contacted with the hot air and flows upwards and dried under the action of the stirring blade and the airflow distributor. Sieve the particle size and humidity of the material back to the rotary drying until qualified.
Features: Fast drying speed. 1-10 seconds to complete the dryer; material residence time can be adjusted. Can be adjusted between 1-500s, suitable for the drying of heat-sensitive materials; a variety of feeding device for the choice of feeding continuous and stable, will not produce bridging phenomenon; drying chamber high circumferential velocity, material residence time is short, effectively prevent the material Sticky wall and heat-sensitive material deterioration; drying chamber equipped with grading ring and cyclone film, material fineness and final moisture adjustable controllable; high drying intensity.