First, the type of wet materials
Wet material type refers here to the combination of material and moisture. The wet material can be divided into 1 capillary porous material, and the moisture is mainly combined with the capillary force, such as sand, silica, activated carbon, ceramics, etc., the bonding strength between water and material is small, drying is relatively easy; 2 colloid The combination of materials, moisture and materials is dominant, such as glue and flour dough. The material generally exhibits high viscosity, and the combined strength of moisture and material is large, and drying is difficult. 3 Capillary porous colloid materials have more than The nature of the two types of materials, such as peat, clay, wood, fabric, grain, leather, etc., is more than a variety of materials, but the form of water combination between such materials is also different, which determines the difficulty of dehydration under the same conditions. Not the same.
The shape of the material also has a great influence on the drying, such as granular materials, the particles are much harder to dry than the particles, and the bulk material is smaller in thickness than the thick one and is easy to dry.
Second, moisture content of wet materials
Moisture content (wet content) is the percentage of moisture in the total weight of the wet material.
The initial moisture content refers to the moisture content of the wet material before entering the dryer. Usually, the wet material can work in the dryer. The higher the initial moisture content, the more the dewatering capacity exhibited by the dryer is. . Conversely, the higher the initial moisture content, the higher the final moisture content, the more the dryer equipment can reach the large dehydration capacity, but the dry material yield decreases.
Third, the ultimate moisture content
Generally, the drying section is in the slow-drying stage. The lower the final moisture content is, the more difficult the drying is. The longer the drying time is required, the lower the thermal efficiency, and therefore the yield.
Fourth, hot air temperature
The hot air temperature, or the temperature of the drying medium, is a condition for the sensitivity of the Zui in drying. The higher the hot air temperature, the more heat energy is contained, and the lower the relative humidity of the hot air, the stronger the ability to absorb water and carry moisture, which is very favorable for drying, and the drying heat efficiency is also high. In many drying equipment, when the other conditions are unchanged, the dewatering capacity of the dryer is basically proportional to the change of the hot air temperature. When selecting the drying equipment, it is necessary to have sufficient data for the ultimate temperature of the damaged material. In the case of material approval, try to select the high temperature medium. It should be noted that there are many drying methods, especially rapid drying. The temperature of the dried material is much lower than the drying medium temperature. For example, the hot air temperature of the air dryer is as high as 250 ° C or higher, and the discharge temperature is generally 60 ° C. the following.
5. Environmental temperature and humidity
Here mainly refers to the influence of weather changes on the drying. Generally, the dryer equipment is heated by the atmosphere as the drying medium. The higher the temperature of the atmosphere, the lower the humidity, the more favorable it is to dry, while the southern spring and summer, the rain Humidity, high humidity, is not conducive to the performance of drying capacity, affecting production.
Wet material type refers here to the combination of material and moisture. The wet material can be divided into 1 capillary porous material, and the moisture is mainly combined with the capillary force, such as sand, silica, activated carbon, ceramics, etc., the bonding strength between water and material is small, drying is relatively easy; 2 colloid The combination of materials, moisture and materials is dominant, such as glue and flour dough. The material generally exhibits high viscosity, and the combined strength of moisture and material is large, and drying is difficult. 3 Capillary porous colloid materials have more than The nature of the two types of materials, such as peat, clay, wood, fabric, grain, leather, etc., is more than a variety of materials, but the form of water combination between such materials is also different, which determines the difficulty of dehydration under the same conditions. Not the same.
The shape of the material also has a great influence on the drying, such as granular materials, the particles are much harder to dry than the particles, and the bulk material is smaller in thickness than the thick one and is easy to dry.
Second, moisture content of wet materials
Moisture content (wet content) is the percentage of moisture in the total weight of the wet material.
The initial moisture content refers to the moisture content of the wet material before entering the dryer. Usually, the wet material can work in the dryer. The higher the initial moisture content, the more the dewatering capacity exhibited by the dryer is. . Conversely, the higher the initial moisture content, the higher the final moisture content, the more the dryer equipment can reach the large dehydration capacity, but the dry material yield decreases.
Third, the ultimate moisture content
Generally, the drying section is in the slow-drying stage. The lower the final moisture content is, the more difficult the drying is. The longer the drying time is required, the lower the thermal efficiency, and therefore the yield.
Fourth, hot air temperature
The hot air temperature, or the temperature of the drying medium, is a condition for the sensitivity of the Zui in drying. The higher the hot air temperature, the more heat energy is contained, and the lower the relative humidity of the hot air, the stronger the ability to absorb water and carry moisture, which is very favorable for drying, and the drying heat efficiency is also high. In many drying equipment, when the other conditions are unchanged, the dewatering capacity of the dryer is basically proportional to the change of the hot air temperature. When selecting the drying equipment, it is necessary to have sufficient data for the ultimate temperature of the damaged material. In the case of material approval, try to select the high temperature medium. It should be noted that there are many drying methods, especially rapid drying. The temperature of the dried material is much lower than the drying medium temperature. For example, the hot air temperature of the air dryer is as high as 250 ° C or higher, and the discharge temperature is generally 60 ° C. the following.
5. Environmental temperature and humidity
Here mainly refers to the influence of weather changes on the drying. Generally, the dryer equipment is heated by the atmosphere as the drying medium. The higher the temperature of the atmosphere, the lower the humidity, the more favorable it is to dry, while the southern spring and summer, the rain Humidity, high humidity, is not conducive to the performance of drying capacity, affecting production.
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