When designing the press-in pneumatic conveying device, it is necessary to understand and study the nature, particle shape, conveying conditions and site conditions of the conveyed material, and on this basis, give full play to the advantages of pneumatic conveying, correctly select the type of pneumatic conveying, and help improve production efficiency.
Design principles for pneumatic conveyor systems.
1. The nature and particle shape of the conveyed material are usually taken as the average particle size as the calculated particle size of the material, and the particle size distribution of the material should be understood. Generally, the size of the accumulation angle and friction angle are used to indirectly represent the fluidity of the material. The fluidity of the same material varies greatly due to the different moisture content. Whether it is internal moisture or surface moisture, the moisture content of the material should be considered, and the adhesion of the material should also be considered.
1) The density and bulk density of the material directly affect the overall size, structural form and power consumption of the pneumatic conveying device.
2) The material crushing rate determines the layout route, conveying distance and appropriate airflow speed of pneumatic conveying.
3) The corrosiveness of the material puts forward special requirements for the material of the transmission pipeline.
4) When the material has an electrostatic effect, the necessary grounding wire and anti-live device must be installed to prevent static electricity.
5) For ** materials, in addition to anti-static, explosion-proof safety measures must also be taken.
6) When transporting dangerous goods, safety measures for closed handling must be considered to prevent pipelines and equipment from being worn or damaged and leaking out.
2. When designing the pressure pneumatic conveying device, the capacity and specifications of the device should be determined according to the conveying capacity per unit time. Pneumatic conveying devices are often part of a complete set of equipment and must be matched with other main and auxiliary engines. If there is a contradiction in the conveying capacity, an intermediate hopper can be used for storage and buffering. Conveying capacity is also process-related. Depending on the process requirements, the decision is made whether to use a batch or continuous plant. When choosing the form of pneumatic conveying, the reliability of the equipment should also be considered, and if the pneumatic conveying fails, the impact on production should be estimated.
3. On the premise of ensuring technology, the starting and ending points of transportation should be as short as possible, and give full play to the advantages of pressure and pneumatic transportation. The installation height and feeding method of the equipment should consider the surrounding environment, and should not obstruct traffic, facilitate maintenance, and reduce equipment maintenance costs.
4. Noise reduction and environmental protection air source machinery noise affects the environment. At the inlet and outlet of the air source, noise reduction measures must be taken. Such as a fan or air compressor installed in a separate room, using a muffler, etc. The pneumatic conveying device must consider the dust removal effect of the exhaust gas, and adopt various dust collectors suitable for the characteristics of pneumatic conveying to prevent and control air pollution. If a wet dust collector is used, wastewater treatment should be considered.
5. The automatic horizontal pneumatic conveying device can realize centralized automatic control and remote control of the control room. This not only reduces the number of operators, but also realizes automatic interlocking to prevent accidents.
6. Installation pointsWhen the pneumatic conveying device is installed outdoors, rainproof and anti-freezing measures should be considered. Forks, superchargers, pneumatic or electrical control components, valves, limit switches, etc. There must be a box in case it fails due to rain.
7. Under special conditions, the cooling factor should be considered for transporting high-temperature materials, and the insulation and heating should be considered for the conveying pipeline. Air source machinery, such as air compressors, should consider water cooling conditions and drainage measures.