Dilute Phase Pneumatic Conveying System Vs Dense Phase Pneumatic Conveying System

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• Dilute Vs Dense Phase Pneumatic Conveying System

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• Dilute Phase Conveying System

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• Dense Phase Conveying System

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Between the dilute and dense phases, which is
preferable?

• Everyone will have doubt in their mind as to what
  choice they should make between the Dilute or
  Dense phase, even if the information is available
  online, but we always have some confusion because
  we miss some guiding principles. So we will give
  you a step-by-step approach to get the selective
  right system.

Dense Phase Plug flow in pipe
Dilute Phase Plug flow in pipe
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1) Difference between Dilute phase and Dense Phase

• The Conveying system where the Solids to air
  ratio (µkgmaterial/kgair)is high ( lt 15) is
  normally considered a dense phase mode of
  conveying. In this case, the velocity is less
  than the saltation velocity. Due to the above
  reason high conveying pressure with low air
  velocity is possible and suitable powders where
  the handling needs are for low breakage, fragile
  abrasives, this system becomes an ideal
  solution.
• The flow pattern usually is in Plug flow or
  moving bed type depending upon each powders
  characteristics

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• Dilute phase, on the other hand, is Characterized
  by a uniform distribution of the particles along
  all sections of the conveying line, with a
  suspension flow regime, i.e. transport velocity
  higher than the saltation velocity (minimum
  velocity to keep all material in suspension).

Specification Dilute Phase Pneumatic System Dense Phase Pneumatic System
Conveying Distance Up to 100 m Up to 500 m
Conveying velocities 15 m/s to 30 m/s Up to 12 m/s
Air pressure Below 1 bar Above 1 bar
Air Volume High Low
Solids Loading Ratio Up to 15 Ranging from 20 to 80
Conveying Capacities Up to 15 TPH Up to 80 TPH
Prime Mover Roots Blower / Centrifugal Fans / Ring Channel Blowers Compressor
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2) System Specifications

• While selecting a system one should consider some
  parameters like the length of the conveying
  system, conveying capacity, the velocity of the
  air and its conveying air volume, and conveying
  pressure.
• The Above system configuration plays a very
  crucial role in choosing the Dense and Dilute
  phases. The data below should be considered as
  stated in slide no.6

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3) Material Properties

• Material properties are the most important
  guidance as the type of conveying system depends
  on the material properties like particle size,
  density, fragile, toughness, abrasive, hardness,
  strength, fatigue etc. For the Dilute Phase
  pneumatic system materials that are free-flowing
  and non-abrasive are used.
• And for Dense Phase Pneumatic System the
  materials best suited that are abrasive, heavier,
  fragile, and have the tendency to degrade.

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Material Conveying System Required
Wheat flour Dilute Phase
Chemical powders Dense Phase/ Lean Phase
Alumina Dense Phase
Fly ash Dense Phase
Soda ash Dilute Phase/ Lean Phase
Coffee beans Dilute Phase
Minerals Dense Phase
Sand Dense Phase
Cereals Dilute Phase
Zinc Dust Dense Phase
PTA powder Dense Phase
Grains Dilute Phase
Sugar Dilute Phase
Micro Silica Dense Phase/ Lean Phase
Quartz Dense Phase
Titanium Dioxide (TiO2) Dense Phase/ Lean Phase
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4) Energy Consumption

• Dilute Phase Pneumatic System consumes less
  energy.
• Dense phase may not be as energy efficient as the
  Lean or Dilute phase as the compressor is used to
  deliver air at 6 barg.

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5) Which to Choose- Dilute Phase or Dense?

• The Question arises which to choose among them-
  the answer depends on three things material
  properties, conveying distance, and conveying
  capacity.
• For Long-distance conveying and high-capacity
  material flow Dense phase is preferred
• For Short-distance and low-capacity powder
  transfer, dilute phase are preferred.
• The Above points would be easy to distinguish
  whether to use dilute or dense phase and which
  one will be feasible for you

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6) Let us see the advantages and disadvantages of
a dilute and dense phase conveying system over
each other.

• Dilute Phase Conveying Advantages
• Reduced Energy Consumption Transporting the
  dilute phase typically requires less energy due
  to the lower pressure.
• Suitable for Soft non-abrasive Materials The
  dilute phase is often preferred for soft
  materials that can be damaged by higher pressures
  and denser packing during dense phase transport.

• Dilute Phase Conveying Disadvantages
• Limited distance The transport of the dilution
  phase is generally suitable for shorter distances
  due to the lower material-to-air ratio and the
  resulting need for higher air velocities.
• Lower Conveying Efficiency Compared to dense
  phase conveying, dilute phase conveying tends to
  have lower conveying efficiency, which means it
  may not be suitable for conveying large amounts
  of material quickly.

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• Dense Phase Conveying Advantages
• Greater Conveying Efficiency Dense phase
  conveying allows larger amounts of material to be
  conveyed in each batch, making it more suitable
  for long-distance transportation or larger volume
  material hauling.
• Less Material Degradation Because the material
  is transported at lower speeds and higher
  pressures, there is generally less material
  degradation and tearing during transport.

• Dense Phase Conveying Disadvantages
• Higher Energy Consumption Dense-phase transport
  generally requires more energy because it
  requires higher pressure and sometimes a larger
  volume of air.
• Restricted to brittle materials Higher pressures
  and the possibility of closer packing can make
  dense phase transfer less suitable for very
  brittle materials.

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• Stratgem develops and manufactures Dilute and
  Dense Phase pneumatic conveying systems based on
  the needs and specifications of the customer for
  the product.
• Stratgem Pune, India offers comprehensive
  services such as field service, start-up service,
  full-scale material testing, and spare parts.
  Among the industries we serve are food,
  chemicals, pharmaceuticals, plastics, minerals,
  and others. To know more about the pneumatic
  conveying system please feel free to connect us!

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• Contact Info.
• Office No. 20, 4th Floor, B Wing, City
  Vista Kolte Patil Downtown, Fountain Road,
  Kharadi, Pune. MH, India 411014
• 91 020 46028762 91 9175673483
• sales_at_stratgemprojects.com
• www.stratgemprojects.com