What is the concept of dense-phase transport?
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What is the principle behind dense-phase transport, and are there any pressure requirements?
Gas-solid transportation can generally be divided into two forms: dense-phase transportation and dilute-phase transportation, with dilute-phase transportation also being known as pneumatic transportation. There is no clear boundary between dense-phase transport and dilute-phase transport; generally, transport is considered to be in dense-phase when the gas-solid mixture density in the system is >100 kilograms/m3 or when the porosity is less than 90%. Conversely, the gas-solid mixture density of the conveying system
Generally, dense-phase conveying is inferior to dilute-phase conveying in terms of conveying distance and capacity, but it requires less power； For large-scale, long-distance, continuous transportation, a dilute phase is preferred.
It is difficult to maintain stability in long-distance dense-phase transport, and the technology for removal is still not fully mastered. Such as slotted tube conveying in catalytic cracking units, it’s still a matter of experience.
What are the requirements for pipeline materials depending on the conveying method?
Thank you! Thank you all for your advice!
The statement above is incorrect; there is no unified standard for distinguishing between dense-phase and dilute-phase transport. Classifying them based on the solid-to-gas ratio is not scientific – it is more appropriate to classify them according to the flow state of the fluid. Dense-phase transport can be used over distances of any length, while dilute-phase transport is suitable for short distances only. Dense-phase transport can cover distances of several kilometers, and in China, there is engineering experience with transports over 1,000 meters in length.