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Select the key parameters and influencing factors of pneumatic conveying system
Conveying capacity refers to the amount of material that the pneumatic conveying system can transport per unit time. For industrial production, the size of the transport capacity directly affects the production efficiency, product quality and cost control. Therefore, it is very important to choose the right pneumatic conveying system and determine its conveying capacity.
First, transport capacity
The conveying capacity of pneumatic conveying system mainly depends on the following factors:
1, product density: This is also affected to some extent by the size and shape of the conveying material. The greater the density of the pile, the greater the mass of the material per unit volume, so the conveying capacity will be correspondingly improved.
2, the energy value of the air: the higher the energy value of the air, the stronger the ability to push the material to move in the pipeline, thereby improving the transportation capacity.
3, the diameter of the transport line: the larger the diameter of the line, the more material can be accommodated in the pipeline, so the transport capacity will be improved accordingly.
4, the equivalent length of the transport line: the longer the equivalent length, the greater the resistance to the material during the transport process, which may reduce the transport capacity.
Second, key parameters
When designing a pneumatic conveying system, the following key parameters need to be calculated and determined:
1, productivity: according to the project needs of the annual throughput, annual working day and daily work shift system calculation, is one of the main basis for equipment design and selection.
2, mixing ratio: that is, the mass concentration of the conveying material contained in the gas in the pneumatic conveying, is an important factor affecting the conveying capacity. The higher the mixing ratio, the higher the conveying capacity.
3, the flow speed of the material: the flow speed of the air in the pipeline needs to ensure that the material can move unimpeded, while avoiding the energy waste and pipeline wear caused by too fast speed.
4, conveying air volume and pipe diameter: according to the characteristics of conveying materials and conveying distance, calculate the required effective air volume, and select the appropriate conveying pipe diameter accordingly.
5. Pressure loss: The energy required for pneumatic conveying is mainly consumed in the pressure loss caused by the movement of the air in the conveying pipeline and the conveying material, so the calculation of pressure loss is an indispensable part of the design.
Third, Influencing factors
In addition to the above factors that directly affect conveying capacity and key parameters, there are a number of other factors that can also have an impact on pneumatic conveying systems:
1, material characteristics: such as particle size, density, viscosity and other physical characteristics will affect the effect of pneumatic conveying, it is necessary to select the appropriate conveying parameters according to the characteristics of the material.
2, transmission distance and height: the greater the transmission distance and height, the need to use a larger pipeline and greater gas flow, but also need to consider the pipeline layout and support mode and other factors.
3, gas properties: the gas used in the pneumatic conveying process must have sufficient fluidity and compressibility, and can not pollute the conveying material. Commonly used gases include compressed air, nitrogen, carbon dioxide, etc.
4, conveying pipes and connectors: choosing the right conveying pipes and connectors can reduce airflow resistance and improve conveying efficiency. At the same time, the material, wall thickness and connection method of pipes and connectors also need to be selected according to the specific situation.
5, control system: a reasonable control system can effectively control the transmission flow, pressure and speed and other parameters, improve the stability and accuracy of the transmission.
6, safety measures: pneumatic conveying process will produce a certain amount of dust and static electricity, the need to take appropriate safety measures, such as the installation of explosion-proof equipment, ground lines, etc.
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