Shanghai Haozhuang Instrument Co., Ltd. has developed a small spray dryer of the brand Hao Zhuang (LNB), which is energy-saving and environmentally friendly, leading the country. Professional manufacturing is more secure and affordable
Simulation study and detailed introduction of small spray dryer: At present, a new type of spray freeze drying device small spray dryer has been researched and developed, which continuously prepares low-temperature and low-humidity air by freezing dehumidification and dehydration, combined with a specially designed atomization device to achieve continuous liquid material Make ice powder and dry. Supercritical spray drying supercritical fluid technology is a relatively new technology. The study used different drying techniques to prepare protein liposome powders, which used supercritical spray drying and subcritical spray drying techniques, and compared the powder properties obtained by different methods, including particle size distribution and morphology. Using supercritical spray drying technology to dry sugar and egg white, etc., studies have shown that the particle size of the dried product is between 1 and 60 Î¼m, and the particles are spherical and the surface is smooth. Due to the special nature of the fluid itself, the supercritical fluid has been gradually promoted and applied in different fields, such as supercritical fluid extraction technology, supercritical fluid drying technology, supercritical fluid reaction, etc. However, the compatibility of supercritical fluids and water is poor, and it is difficult to directly use supercritical drying, which must be entrained by other solvents, and spray drying is often faced with the drying of aqueous solutions. Therefore, combining supercritical fluid with spray drying to form a new supercritical fluid spray drying technology is an area and direction worthy of research. Researchers from abroad have carried out this technical research, but no relevant reports have been reported in China.
Mathematical model and analysis of spray drying: With the development of computer technology, it becomes feasible to quickly obtain mathematical solutions of complex mathematical models. Computational fluid dynamics and technology are used internationally to simulate the entire spray drying process, and considerable results have been achieved. A series of work using CFD to study the spray drying process was carried out, mainly focusing on model establishment, model modification and verification, research on new drying towers, horizontal spray drying, centrifugal spray drying and large-scale industrial pressure spray drying etc.
The research results show that the current commercial CFD software can be used to analyze the temperature field, velocity field, humidity field of the gas medium in the spray drying tower and the flight trajectory, humidity change, temperature change of the material, etc. within a certain range. In order to better obtain the drying characteristics of the droplets, it is also necessary to specifically add the user's custom program, especially the drying model. In addition, because the gas in the drying tower is in a turbulent state, an appropriate turbulence model will also have a greater impact on the simulation results, especially when the drying medium adopts the rotary air intake method, the turbulence has a greater impact. Recently, simulation studies have been conducted on the transient state of spray drying. The results show that the flow field in the drying tower changes with time, so that the movement of the droplets in the drying tower is irregular. Therefore, even if the same fog droplets are set, different drying processes will be obtained. Dry particles; although certain residual solvent requirements are allowed, there is still the possibility of returning to high temperature areas during the actual flight of the droplets. These phenomena still need further analysis and verification.
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