1. The production capacity of the equipment: the hourly water evaporation is the capacity index of the dryer, and directly affects the investment size and the utilization rate of the equipment. When the annual output of dry powder is converted, the operating time rate of the dryer should be fully increased, and long-term continuous production should be arranged as much as possible to reduce the output requirement per hour. The capacity reserve for the expected development should be appropriate.
2. Drying process parameters:
a) Inlet air temperature: increase as much as possible under the conditions that the material can bear, and the exhaust air temperature should be reduced as far as possible without excessive drying under the condition of meeting the moisture content of the finished product.
b) The solid content of the feed liquid, increasing the feed concentration and reducing the initial moisture content, not only can increase the production capacity of dry powder under the same water evaporation condition of the equipment, but also increase the bulk density of the product and increase the specific gravity of dry powder.
3. Hot air system: the energy of hot air. Generally, pharmaceutical factories have steam conditions and the inlet air temperature of drugs is not high. It is most economical and appropriate to use steam + electricity. It is determined by the possibility that the customer has. The maximum temperature limit of the hot air system should be considered to leave room. On the one hand, it is possible to adjust the inlet air temperature for variety replacement, and on the other hand, high-temperature hot air can also be used to sterilize the equipment, which has an effect similar to dry heat sterilization. To the heat-resistant temperature value of the high-efficiency filter and the premise of reasonable economy, it is recommended to design the hot air system according to 2000C.
4. Electrical control requirements: As a production machine, in order to ensure that the production operation and product quality are not fluctuated by human factors, necessary automation should be considered.
a) Automatic control of inlet air temperature and automatic control of exhaust air temperature are required, especially the stability of exhaust air temperature has a direct impact on the stability of the remaining moisture content of the product. As for the control accuracy, under the set temperature conditions, the inlet air temperature is ±5°C, and the exhaust air temperature is about ±1.5-2.5°C, which is economical and appropriate.
b) Speed adjustment of centrifugal atomizer: For multi-variety materials due to changes in viscosity and solid content and to control and adjust the particle size of the product, the variable frequency stepless speed regulation function of the atomizer should be considered.
c) Operation control of intake and exhaust fans: In order to improve the operation strength and direct convenience, it is possible to use remote control of butterfly cutting in the electric control room to control the air volume. If frequency conversion is used to adjust the speed of the fan and directly change the air volume of the fan, it will save 30% of the energy of the fan. The advantages.
d) Other control requirements can adopt conventional manual control or have higher requirements.
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