The boiling dryer mainly uses the air-inducing action of the end induced draft fan to introduce the air at the front end into the air supply duct through the filter and the heater, and then distributes the hot air evenly into the material chamber through the air distribution plate at the bottom of the material chamber. Expansion room. Due to the effect of the wind pressure, the wet material forms a boiling state in the dryer, and the contact surface area with the hot air increases, and the contact is continuously carried out, and the moisture is quickly evaporated, thereby completing the drying of the material in a short time. Finally, the exhaust gas is filtered by the fan through the filter chamber and the precipitator and discharged.
Drying with a boiling dryer mainly has these several characteristics: First, the wet particles are continuously in a boiling state under the agitation of hot air, the movement is intense, the heat exchange is rapid, the fluidization is dry, the drying speed is fast, and the time is short. Second, the operation process is simple. As long as the inlet air temperature is set, the process of drying the material from wet to dry is performed in a closed container under a negative pressure condition. In addition, the boiling dryer is also very good in sealing performance. The drying process does not need to turn over the animal material, no dust flying, tilting the material, convenient and rapid.
Third, the moisture content of the dried material is uniform, and the material can be dried to the desired moisture by controlling the length of time the material stays in the container. Fourth, since the material is in a boiling state, the temperature inside the container is controllable, the distribution is uniform, and there is no local overheating of the material, so it is also suitable for drying certain heat sensitive materials.
Fifth, in the production of placebo, if oven drying is used, the problem of chromatic aberration migration of the material is not easy to solve, and the boiling dryer can solve the problem that the pigment contained in the material may migrate with water. Sixth, the adaptability to different materials is better, and the equipment is small in volume, strong in production capacity, high in thermal efficiency, convenient in operation control, and small in particle breakage rate.
Although the boiling dryer has many features and advantages, some equipment still has a lot of unreasonable places. For example, the air outlets of some dryers are “upper and lower†bell-mouth type, which is not conducive to the distribution and cooling of fresh air after entering the auxiliary machine section. The device is fully in contact. In addition, this will also result in poor heating, and the heat is easily lost and energy is not saved.
Some equipment's steam radiator structure is superimposed on one layer, which is not conducive to maintenance, resulting in more than ten leak points. The welding gun can not reach the leak point for welding repair, the heat exchange effect is poor, and the radiator can only be scrapped. Some steam radiators are directly welded to the outer frame of the auxiliary machine. It is very difficult to remove the radiator from the outer frame after welding, which is not conducive to maintenance.
In addition, the fresh air treatment section does not have any fresh air insect nets and fresh air filter devices, and is completely treated by a high-efficiency filter, which increases the burden of the high-efficiency filter and shortens its service life. The air duct between the auxiliary machine and the boiling dryer is long, and there is a sanitary clean corner, which is not conducive to daily production and cleaning, and the risk of cross-contamination is relatively large.
In view of the above unreasonable places, some companies have made corresponding improvements, such as adding functional accessories for top spray granulation, changing the installation position of the thermometer, controlling the steam pressure, and increasing the material room thermometer. The improved boiling dryer can control the frequent opening and closing of the steam solenoid valve, reduce the influence of the steam heating residual temperature on the system control temperature, and avoid the large fluctuation of the heating chamber temperature.
Although China's boiling dryer technology is relatively mature, there are still some shortcomings in equipment design. In order to ensure the equipment compound regulations and production process requirements, related equipment enterprises need to transform the original equipment, including technology, design, equipment technology, etc. Make boiling dryers and solid preparation equipment better for pharmaceutical production.
Drying with a boiling dryer mainly has these several characteristics: First, the wet particles are continuously in a boiling state under the agitation of hot air, the movement is intense, the heat exchange is rapid, the fluidization is dry, the drying speed is fast, and the time is short. Second, the operation process is simple. As long as the inlet air temperature is set, the process of drying the material from wet to dry is performed in a closed container under a negative pressure condition. In addition, the boiling dryer is also very good in sealing performance. The drying process does not need to turn over the animal material, no dust flying, tilting the material, convenient and rapid.
Third, the moisture content of the dried material is uniform, and the material can be dried to the desired moisture by controlling the length of time the material stays in the container. Fourth, since the material is in a boiling state, the temperature inside the container is controllable, the distribution is uniform, and there is no local overheating of the material, so it is also suitable for drying certain heat sensitive materials.
Fifth, in the production of placebo, if oven drying is used, the problem of chromatic aberration migration of the material is not easy to solve, and the boiling dryer can solve the problem that the pigment contained in the material may migrate with water. Sixth, the adaptability to different materials is better, and the equipment is small in volume, strong in production capacity, high in thermal efficiency, convenient in operation control, and small in particle breakage rate.
Although the boiling dryer has many features and advantages, some equipment still has a lot of unreasonable places. For example, the air outlets of some dryers are “upper and lower†bell-mouth type, which is not conducive to the distribution and cooling of fresh air after entering the auxiliary machine section. The device is fully in contact. In addition, this will also result in poor heating, and the heat is easily lost and energy is not saved.
Some equipment's steam radiator structure is superimposed on one layer, which is not conducive to maintenance, resulting in more than ten leak points. The welding gun can not reach the leak point for welding repair, the heat exchange effect is poor, and the radiator can only be scrapped. Some steam radiators are directly welded to the outer frame of the auxiliary machine. It is very difficult to remove the radiator from the outer frame after welding, which is not conducive to maintenance.
In addition, the fresh air treatment section does not have any fresh air insect nets and fresh air filter devices, and is completely treated by a high-efficiency filter, which increases the burden of the high-efficiency filter and shortens its service life. The air duct between the auxiliary machine and the boiling dryer is long, and there is a sanitary clean corner, which is not conducive to daily production and cleaning, and the risk of cross-contamination is relatively large.
In view of the above unreasonable places, some companies have made corresponding improvements, such as adding functional accessories for top spray granulation, changing the installation position of the thermometer, controlling the steam pressure, and increasing the material room thermometer. The improved boiling dryer can control the frequent opening and closing of the steam solenoid valve, reduce the influence of the steam heating residual temperature on the system control temperature, and avoid the large fluctuation of the heating chamber temperature.
Although China's boiling dryer technology is relatively mature, there are still some shortcomings in equipment design. In order to ensure the equipment compound regulations and production process requirements, related equipment enterprises need to transform the original equipment, including technology, design, equipment technology, etc. Make boiling dryers and solid preparation equipment better for pharmaceutical production.
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