What are the important parameters in pneumatic conveying?
pneumatic conveyingThe main parameters are determined by parameters such as conveying air volume, wind speed, concentration, etc. According to different conveying materials, conveying distance, conveying height, humidity and size of materials have different conveying parameters. When designing a pneumatic conveying system, the first thing to understand is the determination of conveying volume, conveying wind speed, and conveying concentration. These three elements are indispensable in pneumatic conveying.
1. Determination of conveying capacity
? ? The size of the conveying capacity is usually determined by the process specifications. But as the basis for system calculation, the calculated conveying volume should be the maximum amount of material that the conveying pipe may encounter during normal operation, so a certain reserve should be considered, that is, G=aG.
G-Calculation - Calculate the conveying capacity;
? ? ? ?G-Design conveying capacity, determined according to process flow balance sheet or other requirements, and if necessary, measured for accuracy;
? ? ? ?A-Reserve coefficient, an additional coefficient that takes into account process factors such as changes in raw material quality, moisture content, and operational indicators that may cause changes in flow rate.
? ? ? ?The size of the reserve coefficient should be determined based on specific circumstances. Simply for the safety of transportation, inappropriately increasing the value of a will result in an increase in equipment and waste of power. Moreover, due to the calculation results not matching the actual production situation, it will bring operational difficulties and be prone to malfunctions.
2. Transport wind speed
? ? ?The wind speed in the conveying pipe must ensure reliable transportation of materials, while also considering the economic efficiency of the work. The wind speed is too high and the power consumption is too high. The power consumption is almost proportional to the third power of the wind speed. The wind speed is too low, which makes it less adaptable to changes in material conveying volume, unstable in operation, and prone to blockage or material dropping. So, while ensuring stable and reliable transportation, low wind speeds should be adopted as much as possible.
? ? ? ?Usually, when the specific gravity and particle size of the material are larger, the conveying concentration is higher, or the pipeline is bent and horizontally conveyed, the required wind speed should be taken as a larger value, otherwise a lower value should be taken. The wind speed in the conveying pipes of grain processing plants is generally between 20-25 meters per second for grain particles and 16-20 meters per second for powder materials.
3. Determination of transport concentration
? ? ?The conveying concentration μ refers to the ratio of the amount of material conveyed in the conveying pipe to the amount of air, also known as the solid gas ratio or concentration ratio, which is the number of kilograms of material that can be conveyed per kilogram of air. Expressed as: μ=G substance/G gas, where:; G-material - weight of material transported per unit time (kg/hour); G gas - the weight of air passing through the conveying pipe per unit time (in kilograms per hour). From the above equation, it can be seen that conveying a certain amount of material requires a certain amount of compressed air, which consumes power. With less compressed air, power consumption can be reduced. At the same time, with less air, the entire system's pipelines, unloaders, dust collectors, and fans can also be reduced, which can save on raw material consumption and investment costs. This is an advantageous aspect of conveying high concentrations.
? ? ? In pneumatic conveying, the parameters of pneumatic conveying are important. A pneumatic conveying system designed according to standard parameters can achieve better conveying requirements. A well-designed pneumatic conveying system has long conveying distance, high conveying efficiency, no powder running, no air leakage, no blockage, and no discharge phenomena. Therefore, we should choose a professionalPneumatic conveying manufacturer。