The Problem Of Energy Efficiency And Drying Temperature Of Horizontal Spray Dryer

At present, among the many drying equipments, the horizontal Spray Dryer is one of the dryers with higher output value, and each set ranges from several hundred thousand to several million. There are many professional manufacturers of horizontal spray dryers in Wenzhou, Shanghai, Wuxi, Jiangyin, Xining and other places, which provide users with hundreds of Spray Drying Equipment every year. From the perspective of research, in each academic paper of the National Drying Association, the research content of spray drying technology is the first of all models, and the imperfection of the theory and the wide range of applications have always attracted the attention of a large number of researchers. The horizontal spray Dryer has fast drying speed, and the surface area of the material liquid is greatly increased after atomization. In the hot air flow, 95%-98% of the water can be evaporated instantly, and the drying time is only a few seconds, especially suitable for heat-sensitive materials The dryness. Horizontal spray dryer has good uniformity, fluidity and solubility, high product purity and good quality. The production process is simplified, the operation control is convenient, there is no need to crush and screen after drying, which reduces the production process and improves the purity of the product. However, the heat consumption per unit weight of the product is large, and the investment that enterprises need to make is relatively large, which generally cannot be afforded by small and medium-sized enterprises.

Therefore, the main measures to reduce the consumption of spray Drying Equipment. Because the energy consumption in the Spray Drying Process directly affects the economic benefits and development prospects of the enterprise, industry experts have put forward many measures to save energy and reduce consumption in the spray drying process. , Thermal cycle and other links, to further enhance the energy-saving effect of spray drying equipment, reduce costs, improve economic efficiency, and better serve our customers.

The problem of difficulty in drying materials containing organic solvents in horizontal spray dryers: general organic solvents are flammable and explosive. The explosion-proof closed laboratory horizontal spray dryer enables materials to circulate in a closed drying system. The system is filled with inert gas (such as nitrogen or argon), which can avoid the contact of organic solvent gas with outside oxygen, ensuring safe production. The horizontal spray dryer adopts a safe nitrogen (or other inert gas) closed circulation method. The entire system is in a closed state, and the oxygen concentration is monitored online. Once the oxygen concentration in the system reaches 2%, the system will automatically and forcefully shut down. The alarm is a small horizontal spray dryer dedicated to laboratory organic solvents with good safety and easy operation. It can treat flammable and toxic solvents through the combined use of a nitrogen closed cycle method and a complete solvent recovery method. Drying of easily oxidizable substances. Moreover, since the organic solvent has a low boiling point, it is possible to use a low-temperature drying method to dry substances that are prone to thermal denaturation.

The influence of the drying temperature of the horizontal spray dryer: In the operation of the horizontal spray dryer, it is very important to determine the temperature of the hot air entering the tower (hot air temperature) and the outlet temperature (exhaust air temperature). The exhaust temperature is related to the moisture content of the product and should be determined according to the allowable moisture of the product. The higher the hot air temperature, the higher the thermal efficiency and the better the economy. However, too high hot air temperature will cause product quality deterioration, so the hot air temperature must be appropriately increased under the premise of ensuring product quality. The hot air temperature of the horizontal spray dryer will have a significant impact on the bulk density of the product. High-temperature hot air tends to produce low bulk density. This is due to the rapid drying effect of hot air, which hardens the surface of the particles and expands the residual moisture, which promotes the formation of balloon-shaped hollow particles. If high bulk density (low specific volume) is required, or solid particles are required, high-temperature hot air should not be used in the design to contact the newly formed droplets. In the drying of chemicals, the hot air temperature is as high as 538°C, and the product particles are large. It can be found that the residual steam has enough pressure to blow the outer surface into cavities. In food spray drying, the temperature of hot air generally does not exceed 177°C, so the initial diameter of hollow particles is not as large as that of chemicals.