As the name suggests, drying equipment is a machine that reduces the moisture of materials. It has a wide application field. The sludge drying equipment is used to dry sludge. The dregs drying equipment can also retain the effect of the medicine under the premise of drying the dregs. So what types of drying equipment are there? How to choose drying equipment?
Drying equipment type
1. Hollow paddle drying equipment
The hollow blade drying device, also known as the blade drying device, 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 drying equipment. 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 to heat and dry the materials in a conductive manner, 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 be dried and the solvent can be recovered during the drying process. It is commonly used for drying or cooling materials such as carbon black, light calcium carbonate, barium carbonate, nitrile uric acid, gypsum, clay, manganese dioxide, nylon and polyester chips, polyethylene, polypropylene (recovery solvent).
2. Roller scraper drying equipment
The drum scraper drying device is an internal heating conduction type rotary continuous drying device. The rotating drum adheres to the film of a thickness through the lower trough, and the heat is transported to the inner wall of the drum through the pipeline, and is transmitted to the outer wall of the drum, and then the feed film is transmitted, so that the humidity in the film is evaporated and dehumidified, so as to contain The wet parts are dried. The dry material is scraped off the drum by the scraper placed on the surface of the drum, and the screw conveyor placed under the scraper is used to concentrate and package the dry material through the screw conveyor.
The drum scraper drying equipment is suitable for the drying of liquid materials and viscous materials in the chemical, dye, pharmaceutical, food, metallurgy, yeast and other industries. Widely used in: rice flour, oatmeal, alpha starch, potato whole powder and other food products dry products into flakes, powder and granules.
3. Freeze drying equipment
The refrigerating drying device cools the compressed air by heat exchange of the refrigerant during operation, and then the refrigerant is cooled and recycled. The freeze-drying equipment combines a refrigeration system, a vacuum system, a heat-conducting oil heating system, and a moisture-discharging system, and a new type of box structure, which utilizes a large amount of dry storage vacuum space for storing the material space in the tank, so that the powder after drying can be possessed. Good dispersion. It has the advantages of reducing the possibility of oxidative deterioration of the material, eliminating bacteria in the material, ensuring quality, and the original shape of the material can be well retained. The vacuum freeze-drying equipment is suitable for drying high-grade raw materials, traditional Chinese medicine decoction pieces, biological, dehydrated vegetables, chemicals, pharmaceutical intermediates and other materials. It can be seen that it is widely used in the pharmaceutical industry.
4. Double cone rotary vacuum drying equipment
The double-cone rotary vacuum dryer has a slightly olive-like shape with a cover at both ends, and two shafts are arranged 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 drying of materials that do not allow damage to the crystals.
Drying equipment purchase
Knowing the drying equipment of so many types of specifications, our main purpose is to use it, then how to choose drying equipment? We all know that different equipment is required to handle different objects, and the factor that affects our choice of drying equipment is the nature of the material being processed. It is easy to select the appropriate drying equipment by determining the type of material. So, how to judge the material type?
1.The initial state of the material
The initial drying equipment is initially screened by determining the initial state of the material. Under normal circumstances, the materials to be dried have three states, namely solid materials, paste fluidized materials and liquid materials. For solid materials, box drying equipment, flash drying equipment, etc.; paste materials using paddle drying equipment with stirring, vacuum drying equipment, etc.; liquid materials generally use spray drying equipment, boiling drying equipment.
2. Physical and chemical properties of the material
After a preliminary selection of a range of drying equipment based on the initial state of the material, the physical and chemical properties of the material are then considered. Mainly refers to the range of temperature adaptation to ensure that the material will not be damaged by high temperatures. According to our 30 years of design theory in the south, the drying temperature of various drying equipment is as follows, box drying equipment: 60-250 ° C; flash drying equipment: 80-580 ° C; vacuum drying equipment: 0-250 ° C; Spray drying equipment: 100-500 ° C.
3. Calculate the specific amount
Determine the appropriate drying equipment by calculating the required heat and air volume based on the initial and final moisture of the material to be dried.
