Principle of pneumatic conveying roots blower, and what are the advantages and disadvantages of pneumatic conveying roots blower

The Roots blower for pneumatic conveying is designed on the basis of similar products imported from abroad in the 1980s and after improvement. The pneumatic conveying Roots blower is welcomed by users in the pharmaceutical and food fields because of its simple operation, excellent performance and excellent manufacturing, especially it can meet the GMP requirements of the pharmaceutical and food industries. This equipment is especially suitable for the transportation and granulation of Chinese and western medicines and food. The prepared particles have strong disintegration, good fluidity and good instant solubility. It can be directly used for tablet pressing, capsule filling, granules and solid drinks.

The pneumatic conveying roots blower system is mainly composed of air heating system, feed liquid conveying system, atomizer, conveying system, gas-solid separation and collection system, control system, medium circulation mechanism with special requirements, etc. The pneumatic conveying roots blower is also a widely used conveying method, but any system equipment has its advantages and disadvantages, and the pneumatic conveying roots blower is no exception. Now let's introduce it.

1. Due to the large surface area of droplets, the conveying time of materials is very short (in seconds).

2. In the high temperature airflow, the temperature of the material wetted on the surface of the pneumatic conveying roots blower shall not exceed the wet bulb temperature of the conveying medium. The product temperature is not high due to the high conveying speed. Therefore, spray drying is particularly suitable for heat sensitive materials.

3. The pneumatic conveying roots blower has high production efficiency and few operators. Large production capacity and high product quality. The spraying amount per hour can reach hundreds of tons, which is a kind of conveyor with large processing capacity.

4. According to the flexibility of pneumatic conveying Roots blower operation, it can meet the quality indicators of various products, such as particle size distribution, product shape, product performance (excluding dust, fluidity, wettability, instant solubility), product color, aroma, taste, biological activity and product water content.

5. Simplify the process flow. The solution can be directly made into powder products in the conveying tower. In addition, the pneumatic conveying roots blower is easy to realize mechanization and automation, reduce dust flying and improve the working environment.

1. When the air temperature is lower than 150 ℃, the volume heat transfer coefficient of the pneumatic conveying roots blower is low, and the equipment usage is large.

2. The separation requirements of gas-solid mixture are high, generally requiring two-stage dedusting.

3. The thermal efficiency is not high. Generally, the downstream tower type is 30%~50%, and the counter current tower type is 50%~75%

4. The pneumatic conveying Roots blower is complex, covers a large area, and has large one-time investment.

5. The atomizer and powder recovery device are expensive.

6. More air is needed to increase the power consumption of the blower and the capacity of the recovery device.