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Selection Guide for Tray Column

The factors discussed below also influence the choice between trays & packing. As these are guidelines for the selection of trays or packing for a particular service, it is recommended to analyze each design case on its own merit for selection.

Sr. No.

System Favoring Tray Column

System Favoring Packed Column

01

Solid handling

 Vacuum system

02

 High liquid rate feed composition and

temperature

 Low pressure drop application, Revamps- The pressure drop reduction

03

 Large diameter columns Small diameter columns< 900 mm

04

 Performance prediction is easy Corrosive system Or Foaming system

Types of Tray

The particular tray selection and its design can materially affect the performance of a given distillation, absorption, or stripping system. Each tray should be designed so as to give as efficient a contact between the vapors and liquid as possible, within reasonable economic limits.

SCM Sieve Trays:

Sieve trays are perforated plates where the gas phase rises through the holes, and the liquid phase flows across the top of the tray. The interaction between the two phases promotes mass transfer.

  • Perforation Size: Typically ranges from 3mm to 12mm. The size affects the Vapour flow, liquid level & Mass transfer.
  • Open Area: Generally, between 6% to 15% of the total tray area. A higher open area can lead to weeping, while a lower open area can cause flooding.
  • Downcomer Area: This is the area where the liquid flows down to the tray below. It's typically 6% to 25% of the total tray area.
  • Material: Stainless steel, carbon steel, or other corrosion-resistant alloys, depending on the process fluid.
DistilationTrays_SCMSieveTrays

SCM Floating Valve Tray:

Floating valve trays are ideal for scenarios demanding higher turndown ratios. Their proficiency in managing vapor flow grants them superior efficiency across an extensive operational range compared to sieve trays. Floating valve trays are used in applications where high turndown ratios are required. They provide a higher efficiency over a wider operating range than sieve trays due to their ability to control vapor flow.

S Cube Mass Transfer Pvt. Ltd. offers a variety of floating valve trays, including:

  • A rectangular valve: with a unique
  • design that prevents spinning and wearing
  • Conventional round valve trays: A cost-effective option that offers good performance.
DistilationTrays_SCMFloatingValveTray-1
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All of our floating valve trays are made from high-quality materials and are designed to meet the specific needs of your application. We can also provide custom-designed trays to meet your exact requirements.

Benefits of Floating Valve Trays:-

  • Higher efficiency over a wider operating range
  • Increased turndown ratio
  • Reduced weeping
  • Longer life
  • Lower maintenance costs

Bubble Cap Trays:

These trays have risers or chimney-like structures (caps) that force the vapor to bubble through the liquid, enhancing contact and mass transfer.

  • Cap Diameter:

    Typically ranges from 25mm to 200mm.

  • Riser or Chimney Height:

    Usually 50mm to 100mm.

  • Slot Width:

    Around 10mm to 30mm, which determines the vapor velocity.

  • Material:

    Often made of stainless steel or other corrosion-resistant materials.

  • Spacing:

    The distance between the caps can vary, but it's typically designed to optimize vapor-liquid contact.
DistilationTrays_BubbleCapTrays-1
BubbleCapTrays-2

SCM Fixed Valve Trays:

Fixed valve trays are a type of distillation tray that combines the advantages of sieve trays and float valve trays. They have tapered, rectangular valves that are formed out of the tray deck and are oriented parallel to the liquid flow. This design provides several advantages over traditional sieve trays, including:

  • Lower froth height and less entrainment. The lateral release of vapor through the valves helps to reduce the froth height on the tray, which in turn reduces entrainment. Entrainment is the carryover of liquid droplets with the vapor, and it can lead to product loss and contamination.
  • Increased capacity and improved turndown. Fixed valve trays can handle higher vapor and liquid loads than sieve trays, and they also have a wider turndown ratio (the ratio of the maximum to minimum operating rates). This makes them more versatile and adaptable to a wider range of process conditions.
  • Superior mechanical strength. The fixed valves are part of the tray deck, so there are no moving parts to wear out. This makes fixed valve trays more mechanically strong and durable than sieve trays.
  • Excellent fouling resistance. The large valve openings allow for easy cleaning, which helps to prevent fouling. Fouling is the buildup of deposits on the tray, which can reduce efficiency and lead to operational problems.
DistilationTrays_SCMFixedValveTrays

S cube Fixed valve trays offer largest available fixed valve. large lateral openings produce a vapor cleaning effect. fixed valve trays have been successfully applied in a varity of fouling services such as Strippers,Waste eater Towers. fixed valve trays are well proven in various industrial applications ranging from low to high distillation.

SCM Cartridge Tray:

Cartridge trays are typically used in narrow flanged columns where internal setups are impractical. These columns often have diameters between 300 and 800 mm (12” to 30”). For ease and quick installation, cartridge trays are assembled in groups. They can accommodate a variety of tray decks and downcomers.

DistilationTrays_SCMCartridgeTray

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