Drying equipment is widely used in many fields, and there are many types. Here are some common drying equipment applications.
(1)Spray drying equipment
Spray drying is the most widely used technology in liquid forming and drying industry. It is most suitable for producing powdery and granular solid products from solution, emulsion, suspension and paste liquid raw materials. Therefore, spray drying is a very ideal process when the particle size distribution, residual moisture content, bulk density and particle shape of waste products conform to the exact specifications.
(2)Drum scraper drying equipment
The drum scraper drying equipment is a continuous operation equipment that stops drying liquid or strip materials attached to the outer wall of the drum by means of heat conduction through a rotating cylinder. The material liquid to be dried and disposed of is flowed into the receiving trough of the drum dryer from the high trough. Driven by transmission installation, the drying drum rotates at regular speed. Material is mounted by a cloth film, which forms a material film on the wall of the drum. The heating medium is continuously fed into the cylinder, and the cylinder body is heated. The moisture of the material film is vaporized by the heat transfer of the cylinder wall. Then the material that reaches the drying request is scraped off by a scraper, and is spirally delivered to the storage tank to stop packaging. The moisture removed by evaporation, depending on its nature, can pass through the airtight cover and be introduced into the corresponding disposal installation.;Usually it is water vapor, which can be directly discharged from the exhaust pipe on the top of the hood to the atmosphere. The machine is mainly used to dispose of liquid materials. It can be heated and dried by steam, hot water or hot oil and cooled by cold water. According to different material properties and process requirements, submerged feeding, spraying feeding and milling feeding methods can be adopted.
(3)Hollow blade drying equipment(Blade drying equipment)
Hollow blade drying equipment, also known as blade drying equipment, is mainly composed of jackets.WThe utility model is composed of a shape shell, two hollow propeller blade shafts and a transmission installation. The hollow blades are arranged on the axle, and the rotating joints with the introduction of heat medium are installed at the axle end. The heat required for drying water is provided by a jacket.WThe inner wall of the groove and the hollow blade wall are transmitted to the material. During the drying process, the hollow shaft with hollow blades not only heats the material, but also stops mixing the material, thus stopping the renewal of the heating surface. It is a continuous conduction heating drying equipment. The heating medium is steam, hot water or heat conducting oil. Heating medium enters the shell jacket and two hollow propeller blade shafts, and stops heating and drying by conduction heating. The structure of hollow propeller blade shafts of different materials is different. The machine is suitable for handling all kinds of paste, granular, powder and other materials with good thermal stability. It can also dry heat sensitive materials under special conditions and recover solvents during drying process. Usually used in carbon black, light calcium carbonate, titanium dioxide, barium carbonate, nitrile uric acid, gypsum, clay, manganese dioxide, nylon and polyester chip, polyethylene, polypropylene(Solvent recovery)Drying or cooling of materials.
(4)Vacuum Rake Drying Equipment
Drying materials take part in the middle of the shell above the vacuum rake drying equipment. Under the stirring of the rotating rake teeth from time to time, when the material contacts the shell wall, the appearance is updated from time to time, and the dried materials are subjected to steam.(Or hot water or heat conducting oil)Indirect heating, but the material water vaporization, vaporized water pumped by the vacuum pump in time. The dried material is indirectly heated by the heat carrier to vaporize the water in the material, and the vaporized water is discharged in time by the vacuum pump.
Because of the high vacuum degree of operation, it is common in theFour hundred～700mmHgWithin the range, the water vapor pressure on the surface of the dried material is much greater than that in the evaporation space of the dryer shell. Thus, it is beneficial to the drainage of internal and external moisture of the dried material, and to the movement of water molecules of the dried material, so as to achieve the purpose of drying. Vacuum rake drying equipment is suitable for heat-sensitive, oxidizable materials at high temperature or easily solidified materials during drying, as well as materials that need to be recovered from steam discharged during drying. Typical drying materials are sodium propylene sulfonate, sodium propylene sulfonate, sodium propylene sulfonate, sodium propylene sulfonate, sodium propylene sulfonate and sodium propylene sulfonate.CMCPhthalocyanine blue, dye intermediates, carboxymethyl starch, maltodextrin, anthraquinone sulfonic acid, etc.
(5)Double cone rotary vacuum drying equipment
The double cone rotary vacuum dryer body is slightly olive-shaped, with caps at both ends and two axes in the middle to support the body. The jacket is used for heating, and the body can be rotated during drying, so that the material and the wall are often changed and contacted, which restrains the defect of low thermal efficiency in vacuum oven where the material mainly depends on the heat transfer of the heating cylinder. Rotary vacuum dryer has been widely used in precision chemical industry, medicine, etc. It is not suitable for materials with high viscosity or strong adhesion in the process of rotation. The equipment is mainly used for concentrating, mixing, drying of powder, granular and fibrous materials in pharmaceutical, chemical and food industries and materials requiring low temperature drying.(For example, biochemical products, etc.)It is more suitable for drying of oxidizable, volatile, heat-sensitive and intense stimuli, toxic materials and materials that are not allowed to destroy crystals.
(6)Belt drying equipment
The belt drying equipment consists of several independent units. Each unit section includes a circulating fan, heating installation, separate or common novel air extraction system and exhaust exhaust system. The operation parameters of drying medium quantity, temperature, humidity and exhaust circulation can be controlled independently to ensure the reliability of the belt dryer and the optimization of operation conditions. The belt dryer is sensitive to operation, wet material feeding, drying process stops in the fully sealed box body, the working conditions are good, and the dust leakage is prevented. It is suitable for drying flaky, strip and granular materials with good air permeability. It is especially suitable for materials with high moisture content such as dehydrated vegetables and Chinese herbal slices and material temperature is not allowed to be high.
Since the evaporation temperature of volatiles in evaporation of materials can be reduced after decompression, it is suitable for drying of various heat sensitive and oxidizable materials. This installation is usually a cylinder or other vacuum-operated housing, in which the heating is stopped by electric heating or hot water, heat conducting oil through heating plate or heating pipe. It is suitable for small batch intermittent consumption.
Oven is a general drying equipment with wide application. It belongs to plate-shelf intermittent drying equipment and is used in pharmaceutical, chemical and food industries. Heat curing, drying and dehydration of materials and products in light and heavy industries. Such as raw materials, crude drugs, Chinese herbal pieces, extracts, powders, granules, granules, granules, water balls, packaging bottles, pigments and dyes, dehydrated vegetables, dried melons and fruits, sausages, plastic resins, electrical components, baking paint, etc.
Rotary flash drying equipment
The dried material enters the drying chamber through the screw input device and is crushed by the stirring paddle at the lower part of the dryer. The crushed material contacts the hot air abundantly. Under the dual action of the stirring paddle and the air distributor, it moves upward and dries. The material with qualified particle size and humidity through the selection of the firearm dries downward until it is qualified.
Product characteristics: fast drying speed.1-10Drying equipment can be completed in seconds;Material residence time can be adjusted. Available in1-500sIntermediate conditioning, suitable for drying of heat sensitive materials;A variety of feeding installation for selection, feeding continuous and stable, will not produce bridging phenomenon;High circumferential gas velocity and short residence time of materials in drying chamber can effectively prevent materials from sticking to walls and thermal sensitive materials from degenerating.;The drying chamber is equipped with grading rings and swirling vanes. The fineness and final moisture of the material can be adjusted and controlled.;High drying strength.
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