TThe centrifugal spray dryer adopts high-speed centrifugal motion disk atomization, atomizes the material into mist-like droplets, and conducts heat exchange with the hot air that enters the tower through a special distribution in a matching movement track at the same time, in a very short time Evaporate the water to form a uniform powdery dry product. Centrifugal spray dryers are widely used for drying in chemical, food, pharmaceutical, petrochemical, light industry, pesticide and other industries.
The centrifugal spray dryer has a 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. It is especially suitable for the drying of heat-sensitive materials. . The product has good uniformity, fluidity and solubility, high purity and good quality. The production process is simplified and the operation and control are convenient. For liquids with a moisture content of 40-60% (up to 90% for special materials), it can be dried into powder products at one time. After drying, there is no need to pulverize and screen, which reduces the production process and improves the purity of the product. The product particle size, bulk density and water content can be adjusted by changing the operating conditions within a certain range, and the control and management are very convenient.
The spray drying process is completely dependent on the product of the composition. Some are very easy and others are very difficult to dry.
The total moisture content of the exhaust air is one of the most important parameters. It depends on the composition of the product, for example, the total moisture content in the exhaust air is high, the dryable product has a high protein content, and the high carbohydrate content requires a low moisture content to avoid sticking to chambers, pipes and cyclones powder.
This is also why the total moisture content in the surrounding air is an important parameter, knowing the design of the previous factory, as a reduction, if the total moisture in the surrounding environment is high “dry potential”.
Another important parameter to know is the maximum solids content in the concentrate. This is viscosity driven and therefore also depends on the product of the composition. As a rule of thumb, the following applies:
High fat content: Allows higher solids content. A lower drying temperature is required to avoid stickiness (ie low total moisture content in the exhaust gas).
High protein content: requires lower solid content due to viscosity (except for hydrolyzed protein). Allows a higher drying temperature to be non-stick (that is, exhaust gas with high total moisture content). The higher protein content makes it more difficult to become an agglomeration process.
High carbohydrate content: Allows a higher solid content (except starch, due to its high viscosity) concentrates. Higher spray drying temperatures are allowed, and if the carbohydrates are of high molecular weight type (for example, maltodextrin and starch), this will lead to an increase in the glass transition temperature. The moisture content of the air discharged from the chamber can be higher when the powder is dried, and has a higher glass transition temperature, resulting in more economical drying.
If the carbohydrate is of low molecular weight type (such as sugar, lactose and glucose syrup), it will cause the glass transition temperature, which requires a lower spray drying temperature to avoid stickiness (ie, lower total moisture content reduces discharge air).
he centrifugal spray dryer adopts high-speed centrifugal motion disk atomization, atomizes the material into mist-like droplets, and conducts heat exchange with the hot air that enters the tower through a special distribution in a matching movement track at the same time, in a very short time Evaporate the water to form a uniform powdery dry product. Centrifugal spray dryers are widely used for drying in chemical, food, pharmaceutical, petrochemical, light industry, pesticide and other industries.
The centrifugal spray dryer has a 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. It is especially suitable for the drying of heat-sensitive materials. . The product has good uniformity, fluidity and solubility, high purity and good quality. The production process is simplified and the operation and control are convenient. For liquids with a moisture content of 40-60% (up to 90% for special materials), it can be dried into powder products at one time. After drying, there is no need to pulverize and screen, which reduces the production process and improves the purity of the product. The product particle size, bulk density and water content can be adjusted by changing the operating conditions within a certain range, and the control and management are very convenient.
The spray drying process is completely dependent on the product of the composition. Some are very easy and others are very difficult to dry.
The total moisture content of the exhaust air is one of the most important parameters. It depends on the composition of the product, for example, the total moisture content in the exhaust air is high, the dryable product has a high protein content, and the high carbohydrate content requires a low moisture content to avoid sticking to chambers, pipes and cyclones powder.
This is also why the total moisture content in the surrounding air is an important parameter, knowing the design of the previous factory, as a reduction, if the total moisture in the surrounding environment is high “dry potential”.
Another important parameter to know is the maximum solids content in the concentrate. This is viscosity driven and therefore also depends on the product of the composition. As a rule of thumb, the following applies:
High fat content: Allows higher solids content. A lower drying temperature is required to avoid stickiness (ie low total moisture content in the exhaust gas).
High protein content: requires lower solid content due to viscosity (except for hydrolyzed protein). Allows a higher drying temperature to be non-stick (that is, exhaust gas with high total moisture content). The higher protein content makes it more difficult to become an agglomeration process.
High carbohydrate content: Allows a higher solid content (except starch, due to its high viscosity) concentrates. Higher spray drying temperatures are allowed, and if the carbohydrates are of high molecular weight type (for example, maltodextrin and starch), this will lead to an increase in the glass transition temperature. The moisture content of the air discharged from the chamber can be higher when the powder is dried, and has a higher glass transition temperature, resulting in more economical drying.
If the carbohydrate is of low molecular weight type (such as sugar, lactose and glucose syrup), it will cause the glass transition temperature, which requires a lower spray drying temperature to avoid stickiness (ie, lower total moisture content reduces discharge air).
