Pneumatic Conveying Explained: The 3 Key Phases of Dense Phase Conveying
What this video shows
Dense phase pneumatic conveying moves powders and bulk solids slowly, in slugs, instead of suspending them in a fast air stream. Qlar explains the three key phases of the method in this video. Its ProPhase pumps run from up to 25 t/hr over 200 metres to 250 t/hr over 1,500 metres, with the Dome Valve as the only moving part.
What the footage shows
The video walks through the three key phases of dense phase pneumatic conveying and sets them against dilute phase conveying, the other method Qlar builds for.
Demonstrated solution
Dense phase moves material at low velocity in slugs rather than suspending it in a fast air stream. That is what keeps abrasive and friable products intact and the pipeline wear low. Qlar states that its ProPhase pumps carry material from fine cohesive powders to wet lump coal, at temperatures up to 480 °C, with the Dome Valve as the only moving part in the pump.
Technical overview
Key features
- •Low velocity conveying in slugs instead of suspension in a fast air stream.
- •Dome Valve as the only moving part in the dense phase pump.
- •ProPhase throughput from up to 25 t/hr over 200 metres to 250 t/hr over 1,500 metres, depending on pump type.
- •Handles fly ash, cement, gypsum, coal, furnace slag, alumina, fluorite and dry sand.
- •Rated for material temperatures up to 480 degrees Celsius.
Benefits
- •Less product degradation than dilute phase, because the material is not thrown through the line
- •Lower pipeline wear with abrasive materials
- •Reduced air flow and power consumption on the pump types Qlar names for it
- •Few moving parts, which keeps maintenance predictable
Typical applications
- •Cement and building materials, including fly ash and gypsum
- •Power generation, coal and furnace slag
- •Metals and minerals, alumina and fluorite
- •Any line where abrasion or product breakage rules out dilute phase
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About this video
The Three Phases of Dense Phase Conveying
This video from Qlar explains the three key phases of dense phase pneumatic conveying and where the method fits against dilute phase. It is short and deliberately general: the question it answers is which conveying method belongs in a line, not how one specific pump is built.
Why phase matters
In dilute phase conveying the material is suspended in a fast moving air stream. That is simple and cheap, and it is hard on anything abrasive or fragile: the product hits bends at speed, breaks up and wears the pipeline. Dense phase moves the same material slowly, in slugs, at higher pressure and lower velocity. The trade is equipment cost and control complexity against product integrity and pipeline life.
What Qlar builds for it
Qlar states that the Dome Valve is the only moving part in its dense phase pump. The ProPhase range runs from up to 25 t/hr over 200 metres to 250 t/hr over 1,500 metres depending on pump type, and handles material from fine cohesive powders to wet lump coal at temperatures up to 480 degrees Celsius.
Where the decision is usually made
Two questions decide it in practice: does the product break, and does it abrade the line. Fly ash, cement and alumina are the classic dense phase cases, and they are also the materials Qlar names for these pumps.
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