Fluidized bed drying equipment is the use of technology for liquid or solid particles in physical or chemical processing, such as drying, extraction, adsorption and ion exchange, particle mixing machinery and equipment. Fluidized bed drying equipment due to have a higher rate of heat and mass transfer, compact, easy to operate and other advantages which are widely used in chemical, food, ceramics, pharmaceutical and other industries. Flow technology originated in 1921, was first used in industrial production is dry Dole in 1948 established the United States - Oliver solid fluidized device, while China until 1958 before starting the development of this technology. Fluidized bed drying process bulk material is placed on the plate, the lower the transmission of gas, so that the material particles in suspension, the same as if the liquid boils, making full contact with the material particles and gases, for rapid heat transfer and water delivery. Fluidized drying effect due to having good heat transfer and temperature distribution, operational forms, materials adjustable dwell time, low investment costs and less maintenance work, etc., have been widely developed and applied. Before the reform and opening up, China basically no formal industrial production, individual producers, Design and Research Institute (Institute), universities and other units designed to produce a part cylindrical or horizontal multi-room bed, and has begun contacting vibration fluidized bed and circulating fluidized bed. According to incomplete survey results show that by 1971, the country has been using a fluidized bed of more than 40 companies, located in the chemical industry, pharmaceutical and other industries, materials involved with Teflon, polyester particles, chlorine ammonium, sodium salicylate, anhydrous sodium sulfite, amino aspirin, oxytetracycline, catalysts and other dozens. But then the limited domestic production level of specialization, the promotion of new technologies only a small range in the industry, the development of speed and scale are limited. The beginning of reform and opening up, state advocates encourage the introduction of advanced technology, the domestic chemical industry, medicine, food and other industries, the introduction of a large number of representatives of contemporary advanced level of fluidized bed dryer, such as the introduction of Heilongjiang Anda dairy spray vibrating fluid bed two-stage drying system, Liaoyang Petrochemical, Yanshan Petrochemical, Qilu Petrochemical, the introduction of multi-room two-stage fluidized-bed and fluidized-bed drying device airflow, salt city of Hubei Province, the introduction of the vibrating fluid bed Tianjin Soda Plant, Yingkou saltworks introduced heat bed, Beijing pharmaceutical companies such as the introduction of a fluidized bed granulation drying equipment, the introduction of the pesticide plant in Jilin rock stirred fluidized bed. Introduction of these advanced devices, greatly broadened the horizons of domestic drying industry, promote innovation and updating of products. At the same time, some companies domestic drying industry is rapidly taking the introduction of horizontal joint, digestion and absorption of other means to increase new product development efforts. Tieling Seiko machinery plant in 1982 in collaboration with Northeast University of Technology (now Northeastern University) developed vibration fluidized bed dryer, the first in the commercialization of this advanced technology, welcomed by users, the huge market potential. The beginning of reform and opening up, China's interest in drying technology research institutes, universities, but a dozen, almost no professional production plant. The rapid development of pharmaceutical production technology led to the unprecedented prosperity of pharmaceutical machinery, pharmaceutical products fluidized bed drying equipment technology also will be "gone." Because of the fluidized bed drying method inherent advantages and equipment technology continues to improve and enhance its been in the pharmaceutical process more and more promotion and application, but its application has some limiting resistance, such as: dried grained material requirements are more stringent, the particle size is too small to be easily entrained flow, fluidized particle size is too easy; when several materials mixed with dry, then the requirements of the relative density of several materials should be close; general NA moisture content is too high Easy agglomerated material, or otherwise knot wall bed blocking phenomenon prone, and so on. But fundamental, fluid bed drying equipment for its excellent performance has been recognized more and more, which are widely used in the pharmaceutical production is not surprising. After the year 1990, in drying technology research units have been around the chemical industry and other specialized universities, also has more than 20 manufacturing enterprises. Nearly 10 years, with the development of the national economy, drying technology has also been considerable progress. Professional production companies has increased 10 times, reaching more than 300, the current can almost all conventional fluidized bed dryer domestic production. Vibration fluidized bed dryer working principle and structure of the wet material into the fluidized bed with the hot air in the air distribution plate side contact material particles suspended in the air stream, forming a fluidized state. Fluidized state of the material particles with the hot air uniformly, sufficiently mixed, very strong heat and mass transfer, removal of water, to dry. Qualified products from the discharge port of the fluidized bed, dust and gas purification equipment after the dust into the atmosphere by the induced draft fan. When the particulate material is dried in a fluidized bed dryer in general, the material should be uniform and the particles have a certain size, or will form a groove-like flow and the drag area, the particle size distribution width, entrainment serious caking humidity, , as well as due to particle backmixing, large particle residence time distribution, particle uneven moisture content, thus limiting the range of the ordinary fluid bed dryer. In order to overcome its shortcomings, foreign fluidized bed dryer at improving performance and other aspects of a lot of research. In particular to strengthen the energy crisis today heat and mass transfer processes, save energy, improve quality, fluidized bed dryer with a wide range of adaptability and reasonableness of the economy, vibration fluidized bed dryer is of great significance. Vibration fluidized bed dryer advanced design, reliable quality, wide application and has significant advantages of energy saving and energy to dry on the other dryers difficult to dry the material, and therefore vibration fluidized bed dryer to be extremely popular in various industries. Vibration fluidized bed dryer is produced by the vibration of the machine vibration motor excitation force, the material in a given direction under the action of this exciting force leap forward, while vibrating fluid bed hot air drying machine at the end of the input stream of the material state, full of hot air in contact with the material particles, so as to achieve the desired drying effect. Material from the vibrating fluid bed dryer into the spout, the lower heat transfer materials contact hot quadrature oscillator tank vibration and vibration fluidized bed dryer pass into the slot on the wet air is drawn from the wind, dry material from the discharge port discharge. Vibration fluidized bed dryer Main Features 1, vibration fluidized bed dryer using vibration motor drive, smooth operation, low noise, long life and easy maintenance. 2, vibration fluidized bed dryer vibration make the material accessible fluidized state, increasing the effective heat transfer coefficient, high thermal efficiency so. Bed temperature distribution, no local overheating. Fluidized uniform, no dead ends and broken phenomenon. Vibration from the transport role, but also help save energy. Drying device than the average energy savings of 30-60%. 3, material thickness, and the machine movement speed and amplitude can be stepless adjustment, adjustable, good speed with wide. 4, the material surface damage, can be used for dry brittle materials, material particles can also be used when irregular, does not affect the results. 5, vibration fluidized bed dryer fully enclosed structure, effectively prevent cross-contamination of materials with the outside world, a clean environment, improved working conditions. 6, vibration promote fluidization, air requirements reduced, the particle entrainment rate. Classification fluidized bed dryer suitable material fluidized bed drying equipment in less than 100 years time, through continuous improvement and innovation of researchers, has been considerable development and wide application. Its many types, depending on the nature of the material to be dried and used in a fluidized bed is different, its structure can be divided into: single and multi-cylinder type fluidized-type, horizontal multi-chamber fluidized type, mixing fluidized type, vibration fluidized type centrifugal fluidized type pulsed fluidized type and other types. With the continuous development of fluidized bed drying equipment applied technology, the type of material and adapt more and more, have been widely used in the chemical industry, light industry, medicine, food and other industries. Due to different materials and different requirements for product drying, also appeared in various forms of fluidized bed dryer. On the basis of its type, as described below: 1. single fluidized bed dryer single fluidized bed dryer is the simplest kind of model can be divided into continuous, intermittent two methods of operation. Wider residence time distribution of continuous operation, so much easier to be applied to dry or dry goods index is not very demanding products. Intermittent operation can be used for higher drying moisture content of the material for some of the particles have a certain degree of unevenness and viscous material, the use of built-in bed with a stirrer, low bed operation. The device is simple, easy maintenance, smooth bed temperature, good drying effect, but a long operating cycle. This machine is suitable for dry ammonium sulfate, ammonium chloride, anhydrous sodium sulfite, PTFE, calcium gluconate, basic dyes Ching Lin, catalyst particles, casein anhydride, coconut, salt and other materials. 2. The multi-multi-bed dryer fluidized bed dryer due to the residence time distribution, so the drying time is shorter than the actual needs of single fluidized bed. Can improve the uniformity of the dried product moisture, the dried product is easy to control quality. However, multi-fluidized bed dryer to increase due to the number of layers, but also to ensure the flow between the layers to form a stable state increases in the complexity of the device structure. For removing the moisture binding material, multi-layer fluidized bed is appropriate. Multilayer fluidized bed dryer is suitable for drying polyester chips, sodium salicylate, aspirin amino, oxytetracycline, chlortetracycline, tetracycline, tablets starch granules, powdered sugar, feed, plastics, food and other powdery materials . 3. Horizontal multi-chamber fluidized bed dryer horizontal multi-chamber fluidized bed fluidized bed drying equipment to overcome the multi-layered structure of the complex, the first chamber by feeding machine continuously added disadvantage of wet material layer dryer bed resistance, etc., due to material in a fluidized state, so freely before a room from a back room. The dried material from the last drying chamber discharge port unloading can be difficult to dry a variety of dry granular materials and heat-sensitive materials, and gradually extended to the powdery material. Such drying machine for polyvinyl chloride resin, polypropylene resin, nylon 1010, o-chlorobenzoic acid, tetracycline, oxytetracycline, chloramphenicol, liver powder, powdered sugar, citric acid, oxalic acid, chlorinated rubber and other materials dry. Fluidized bed drying equipment has been widely applied to granular materials in chemical, light industry, medicine, food, plastics, oil, slag, salt, Yan Tang and other industries, powdered materials, bulk materials, fibrous materials, dried special shaped materials, cooling, humidification and other operations, is also used for cooling the drying, cooling humidifying operation. 

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