Pneumatic conveying can be categorized into dilute phase and dense phase, depending on the concentration of the conveyed material and air. The selection method can be determined based on the material being conveyed and the site conditions. Below is an introduction to dense phase and dilute phase pneumatic conveying.

Low-pressure conveying methods are known as稀相气力输送系统。These systems utilize the inlet air pressure and employ either positive or negative pressure to propel or draw materials through conveying lines at relatively high speeds and volumes. The use of a rotating feeder is typical in low-pressure pneumatic conveying systems, where the conveying line pressure is initially set at a higher speed and then drops to nearly atmospheric pressure as the pneumatic conveying system operates. Low-pressure pneumatic conveying systems should employ low-pressure positive displacement blowers as the primary source of compressed air. Typically, products may experience friction with the pipeline during transportation, thus high speeds should be avoided to prevent severe damage to the system's pipelines and valves.

The high-pressure conveying system, also known as dense phase pneumatic conveying system, utilizes air pressure within the pipeline to propel material at relatively low speeds through the conveying line, much like extrusion. Described as a high-pressure/low-speed system with a low material-to-air ratio, dense phase conveying uses a small amount of air to transport a large volume of material. Generally, transported products may experience some loss. Dense phase systems can eliminate or significantly reduce wear on the conveying line by maintaining a moderate design speed, while still providing an adequate yield. Typically, such systems require an appropriate air compressor. The dense phase pneumatic conveying system, if not using low-pressure air supply, can draw a suitable single-stage reciprocating screw or centrifugal (single or two-stage) compressor from the high-pressure system. This air is much cheaper than high-pressure air and can be easily turned off when not in use.

When choosing between dense phase pneumatic conveying and dilute phase pneumatic conveying, analyze your material, site, and conveying requirements. Based on production needs, customize an appropriate pneumatic conveying solution. If you need assistance, please feel free to contact us.