Important parameters of pneumatic conveying system
? ? ? ?in designpneumatic conveyingWhen conveying, it is necessary to understand the parameters of pneumatic conveying in order to make the conveying smoother and achieve the highest efficiency. In general, the important parameters of the conveying system can be divided into productivity calculation, solid gas ratio calculation, conveying air volume and pipe diameter calculation, pressure loss calculation, and each link is closely related. If there is an error in one calculation, it is likely to lead to low conveying volume or even blockage. So it is recommended that everyone choose Shandong Juheng Environmental Protection Equipment Co., Ltd. Juheng has 13 years of experience in pneumatic conveying industry, with installation cases including chemical, pharmaceutical, food processing, lithium battery raw materials, mining plants and other places, and has its own conveying standards for each material's conveying method. Below, we will take you to understand the calculation method of parameters for pneumatic conveying systems.
01 Productivity Calculation
? ? ?In the design of pneumatic conveying systems, the following main parameters must be calculated and determined. The correct calculation and reasonable selection of these parameters not only ensure the normal operation of the equipment, but also reflect the rationality and progressiveness of the overall design of pneumatic conveying. These main parameters include: productivity, mixing ratio, wind speed, air volume, feed pipe diameter, pressure loss, fan efficiency, etc.
The calculation and determination of productivity is one of the main criteria for equipment design and selection. Calculate based on the annual throughput, annual working days, and daily work shift system required by the project. Calculate the maximum throughput per unit time of the pneumatic conveying system.
02 Solid gas ratio calculation
? ? ? ?gas-solid ratioThe mass concentration of the conveyed material contained in the gas in pneumatic conveying refers to the ratio of the mass of the conveyed material to the mass of the gas per unit time. The larger the mixing ratio, the more economical it is, which is conducive to improving the conveying capacity.The main factors affecting the mixing ratio are: conveying method, conveying distance and pipeline layout, conveying pipeline diameter and airflow conveying speed.
03 Airflow velocity for material conveying
? ? ? ?In pneumatic conveyors, air must pass through pipelines at the optimal economic speed. This speed first ensures that the conveyed material is unobstructed in all conveying pipe sections, but if the speed is too low, the frictional pressure loss will increase due to the increase in resistance coefficient.Excessive speed not only wastes energy, but also exacerbates the impact and collision of material particles on the pipe wall, while increasing wear and tear on feeding pipes, bends, and other areas, leading to a shortened service life. Therefore, the selection of conveying speed is related to the operational performance and economic benefits of pneumatic conveying devices.
04 Calculation of conveying air volume and pipe diameter
? ? ? ?The calculated air volume for pneumatic conveying refers to the effective air volume required to transport materials under normal pressure with a temperature of 20 ℃ and a relative humidity of 50%. In the selection of fans, the leakage rate of the conveying system should also be considered, and a margin of 10% -20% should generally be increased.When calculating the inner diameter of a conveying pipeline, it is usually necessary to calculate the required air volume without considering the leakage coefficient. When the conveying distance is long and the conveying speed varies greatly within the same pipe diameter, a variable diameter pipe system can be used.
05 Pressure loss calculation
The energy required for pneumatic conveying is mainly consumed by the air in the conveying pipeline and the pressure loss caused by the movement of the conveyed material. At present, in the design of pneumatic conveying, the calculation of pressure loss mainly adopts empirical formulas.
The pressure loss of two-phase flow in the feed pipe is mainly divided into the following parts:
The pressure loss of air and materials inside the horizontal and vertical feeding pipes;
Pressure loss caused by acceleration;
Pressure loss at pipe fittings such as bends;
Pressure loss caused by compressors, pipelines, and mufflers;
Pressure loss caused by material gas separation, dust removal equipment, feeders, suction nozzles, etc.
? ? ? ?Pneumatic conveying system engineeringIt is a complex project that requires not only parameter calculation, but also years of conveying experience. Therefore, if you need a pneumatic conveying system, please choose a manufacturer with rich experience, so that your conveying can be more stable and efficient.