In pharmacy, spray drying is an important industrial operation. The vacuum spray drying machine can feed and discharge material continuously. Operation is flexible for good drying effect. Such a machine is applicable for drying and granulating of liquid, extraction and powder. Currently, vacuum spray drying machine is widely applied and it can be predicted that in the future its application will be wider and wider.
As the advancement of proposal of energy saving, how to save energy and protect environment has become a question to be answered by spray drying machine manufacturers. Some of them conclude a series of effective measures on the basis of full research. Let’s learn about it together.
First of all, increase the temperature of input hot air. When the temperature of output hot air keeps unchanging, the higher the temperature of input hot air is, the more heat hot air can be exchanged to spraying pulp and the more water can be evaporated by unit hot air. If the production capacity keeps constant, the less hot air is needed, the less heat will be lost. Therefore, heat consumption of vacuum spray drying machine can be reduced.
Second, the temperature of output hot air can be properly decreased. Provided the temperature of input hot air is constant, decreasing the temperature of output hot air can reduce the heat taken away by the output air. Therefore, the heat of hot air can be utilized fully to dry materials.
Next, expand the difference between temperatures of input and output hot air. The temperature difference can be extended by increasing the temperature of input hot air or decreasing that of output hot air. Thus, the heat of hot air can be fully used to evaporate moisture in material so that efficiency is improved and and energy saved.
Fourth, the smaller moisture content material has, the higher efficiency the machine will have. In fact, materials which are viscous or easy to be atomized can be dried in a shorter time. . some additional proper water-reducing agent can reduce moisture content and speed up drying.
Last but not least, heat exchanger is a useful device to recycle wasting heat for energy saving. For example, heat exchanger can be used when vacuum spray drying machine operates. As a result, atomizing efficiency of the drying machine can be improved while energy consumption reduced.
However, apart from advancement requirement on energy saving, extraction sticking to machine wall in laboratory spray drying is also a trouble for some users, especially the material extracted from Chinese herbal medicine.
Experts express that Chinese herbal medicine extractions contains a huge amount of carbohydrate which can be melted in high temperature. Therefore, when the extractions are spray dried in common laboratory spray drying machine, the melting of carbohydrate will cause them to stick to the wall of drying chamber.
Researchers are troubled by this problem frequently. Sometimes, they will add some excipients such as starch or cyclodextrin for powders of good viscosity. However, the result is not that ideal.
Now, for this phenomenon, some drying machine manufacturer innovate their machine and technology. Appropriate temperature of input air can help users to solve this problem during spray drying. Users can produce powders or granules of pretty good viscosity without material sticking to machine wall.
The machine manufacturer also equips the drying machine with automatic cleaning function. Users, after operation, can start automatic machine cleaning to save experiment time. Besides, innovative wall blow swiping device can work well to improve recycling rate. Cost is saved and development can be sustainable.