Internals for packed columns[1]

Sulzer Chemtech

Internals for packed columns

0699 2501

Table of contents

Page

Introduction

2

Column types

3

Liquid distributors

4

Selection of liquid distributors

4

Splash-plate distributor VEP

5

Channel-type distributors VKG and VKR

6–7

Collector / distributor VS

8

Distributors for corrosive media Distributors for further applications

9 – 10 11 – 13

Distributor hole size Liquid collectors

14 15 – 16

Support and locating systems Gas / Liquid inlet systems

17 18 – 19

Introduction This brochure provides an overview of Sulzer Chemtech Column Internals, which have be developed in Sulzer Chemtech’s extensive test facility and used in commercial applications for many years. The following pages will provide you with detailed information on our internals for structured and random packings.

At Sulzer Chemtech, decades of design, construction and manufacturing experience are combined with on-going development and state-of-the-art production methods to guarantee you products of the highest possible quality.

In order to comply with your specific requirements, our sales engineers and specialists will always be ready to discuss detail inquiries with you personally.

We look forward to working with you to develop a customized packed tower solution that will exceed your expectations.

2

Internals for packed columns

Column type When preparing column internals specifications, you must know whether you will be using a flanged column or a welded vessel. If your column is a welded vessel, then you must know the inside diameter of the manhole.

Prior to beginning engineering of your column and internals, Sulzer Chemtech will verify with you the overall column height, and the manhole inside diameter.

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Flanged columns

Welded vessel columns

Packings and internals are installed through the column flange.

Packing and segmental internals are installed through manholes.

3

Liquid distributors

Selection of liquid distributors For every process application, Sulzer Chemtech can offer you a solution fitted to your own particular needs.

When selecting the optimal distributor, professional advice from Sulzer Chemtech’s specialists is always valuable. Our decades of

experience and well-founded expertise make your distributor selection decisions easy.

Peak performance of your column is achievable only if you precisely match your column internals to both your packings and their specific process application.

The following chart shows a choice of Sulzer Chemtech distributors to match your own particular liquid loading and column size. Sulzer Chemtech specialists will help you select just the right liquid distributor for your process application.

200

Collector/distributor, VS 0600 2512-3

100

Channel-type distributor, VKG

High-liquid load distributor, VKH/VEH

Specific liquid load (m3/m2h)

50 : 20

0600 2507-6 0600 2503-3

Channel-type distributor VKG1)

VKR1)

Splash-plate distributor, VEP

1.0

Splash-plate distributor, VEPW 0.5

Low-liquid load distributor, VKRPW1)

fi 0.25 1)

0600 2507-2

Midget load distributor VEPK 0.8 Column diameter (m)

4.0

8.0

Can be supplied in a flanged version, also for diameters > 0,8 m

These distributors are suitable for most applications. For very difficult applications, Sulzer Chemtech can provide customdesigned distributors that will fit your specific requirements.

4

Liquid distributors

Splash-plate distributor VEP The splash-plate distributor VEP is Sulzer Chemtech’s most widely used distributor.

Its patented discharge system has several advantages: Fewer lateral holes, due to the spreading effect of the splash-plate.

Larger hole diameters than conventional discharge systems.

Anti-plugging, due to large holes and the lateral discharge of liquid.

The feed liquid is pre-distributed at a precisely controlled rate from a main channel (mounted above) into the individual arm channels.

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Splash-plate distributor VEPW For low liquid flow rates, the special splash-plate distributor VEPW is used to accommodate liquid loads as low as 0.1 m3/m2h.

Low pressure drop and no entrainment up to F 4.5 Pa0.5

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Discharge system VEP

Specifications Diameter

> 0.8 m

Liquid load

0.5 to 30 m3/m2h VEPW: 0.1 to 1.0 m3/m2h

Drip-point density

40 to 200 drip points per m2

Turndown ratio

3:1 max.

Gas load

F-factor up to 4.5 Pa1/2

Sensitivity to contamination

Slight

Construction details

Can be levelled by a device supported on the packing

Special note

If required, this distributor can be constructed as a self-supporting unit (e.g. for use with random packings) 5

Liquid distributors

Channel-type distributor with bottom holes VKG The channel-type distributor VKG has been successfullly used for many years in columns up to 2 m diameter.

It is one piece distributor with integral channels attached, suitable for installation through a removable head of a vessel. A segmental version can be installed through a manhole in larger vessels.

The liquid is fed into a large center channel, then distributed through holes in the individual channel bottom onto the packing. The VKG distributor is not recommended at low liquid loads when suspended solids are present.

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Discharge system VKG

Specifications

6

Diameter

0.25 to 2.0 m; flanged design above 0.8 m

Liquid load

1 to 100 m3/m2h

Drip-point density

40 to 200 drip points per m2

Turndown ratio

3:1 max.

Gas load

F-factor up to 4.5 Pa1/2

Sensitivity to contamination

At low liquid loads

Construction details

Can be levelled by means of locating or suspension device

Special note

In addition, a pre-distribution system is used at high liquid loads and larger column diameters

Liquid distributors

Channel-type distributor with lateral tubes VKR The channel-type distributor VKR resembles the distributor VKG except that it uses tubes at the side of the channels rather than holes in the channel bottom to distribute the liquid onto the packing. This feature makes the distributor VKR less susceptible to plugging.

The multiple-stage version is able to handle broad liquid loading ranges, up to 10:1. The range of liquid loading must be carefully considered when designing a distributor VKR. 0601 2503

Low-liquid load distributor VKRPW For extremely low-liquid loads, the special channel distributor VKRPW is used to accommodate liquid loads as low as 0.05 m3/m2h. Its has a supplemental liquid distribution system beneath each tube to distribute extremely low liquid volume evenly to the packing.

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VKR

Discharge system

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VKRPW

Specifications Diameter

> 0.25 m

Liquid load

1 to 20 m3/m2h for VKR; 0.05 to 1 m3/m2h for VKRPW

Drip-point density

40 to 200 drip points per m2

Turndown ratio

3:1 max.; multiple-stage distributor, 10:1

Gas load

F-factor up to 5 Pa1/2 for VKR; up to 3.5 for Pa1/2 for VKRPW

Sensitivity to contamination

Slight

Construction details

Can be levelled by means of locating or suspension device

Special note

The low-liquid load distributor is constructed in diameters up to 4 m

7

Liquid distributors

Collector / distributor VS The collector/distributor VS is used whenever collection and redistribution of liquid is required at very high liquid loads. It resembles a chimney tray; however the chimney arrangement is custom designed for your application’s liquid distribution and pressure drop requirements.

For moderate liquid loads applications, where liquid mixing is important, a separate accumulator tray must collect the liquid and feed it to a liquid distributor located below it.

0600 2512-3

Specifications

8

Diameter

0.25 - 8.0 m

Liquid load

>30 m3/m2h

Drip-point density

40 to 160 drip points per m2

Turndown ratio

3:1 max.

Gas load

F-factor up to 3 Pa1/2

Sensitivity to contamination

Slight

Construction details

Tray construction, bolted and supported on ring with chimney types corresponding to hydraulic requirements

Special note

Truss supports are used in large column diameters

Liquid distributors for corrosive media

Plastic distributor The bottom-hole distributor VEG and the channel-type distributor VKR are available in PP, PVDF, PVC, and other plastic materials.

The maximum operating temperature is 60 to 100 oC depending on plastic material.

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Specifications Diameter

0.25 - 6 m

Liquid load

1 - 20 m3/m2h

Drip-point density

80 to 200 drip points per m2

Turndown ratio

3:1 max.; multiple-stage, 10:1

Gas load

F-factor up to 4.5 Pa1/2

Sensitivity to contamination

Slight for VKR

Construction details

Supported on the packing

Graphite distributor VSTG The one-piece distributor VSTG is constructed of graphite for use in highly corrosive environments. It uses tubes with lateral outlets to distribute the liquid onto the packing. It is installed in flanged column only.

Graphite distributors VSTG can be used to collect and redistribute liquids between packed sections.

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Specifications Diameter Liquid load Drip-point density

0.25 - 1.6 m 1 to 20 m3/m2h 40 to 160 drip points per m2

Turndown ratio Gas load Sensitivity to contamination Construction details

3:1 max., multiple-stage, 10:1 F-factor up to 3 Pa1/2 Slight Supported on the packing 9

Liquid distributors for corrosive media

Glass distributor VRGG The distributor VRGG is made of glass for use in small columns. The patented closed tube discharge system has special outlets on the underside of the distribution tubes to distribute the liquid onto the packing.

It is a one-piece distributor that can be installed through a column flange by following the prescribed installation procedures.

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Specifications

10

Diameter

0.25 - 1.2 m

Liquid load

1 to 20 m3/m2h

Drip-point density

40 to 200 drip points per m2

Turndown ratio

3:1 max.

Gas load

F-factor up to 4.5 Pa1/2

Sensitivity to contamination

High

Construction details

Supported on the packing

Liquid distributors for further applications

Spray nozzle distributor VRD The spray nozzle distributor VRD is specially designed for and used in refinery and scrubber columns. Proper spray nozzle selection is crucial to the operation of your columns.

Sulzer Chemtech specialists will help you chose from a variety of fullcone, axial, and tangential nozzles to customize your spray patterns to your specific application’s requirements.

0600 2511-6

Midget load distributor VEPK This distributor is applied for very low liquid loads < 100 l/m2h The orifices are placed in sidewalls to allow catching of sinking dirt.

0609 2500-3

High-liquid load distributor VKH/VEH The distributor VKH is used for high liquid loads, e.g. greater than 20 m3/m2h. This is an excellent nonplugging distributor. The liquid is discharged laterally from rectangular channels onto the packing.

0609 2500-5

11

Liquid distributors for further applications

Bottom-hole distributor VEG The distributor VEG resembles the widely used splash-plate distributor VEP. The difference is that the liquid is discharged through holes in the channel bottoms rather than laterally against a vertical baffle. It is not recommended for liquids containing solids.

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Lateral distributor VER The liquid is discharged laterally and guided by conducting elements to the packing surface.

The distributor allows high vapor loads F > 5 Pa1/2.

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Tube distributor VRG The distributor is non sensitive on moving conditions like columns operated off shore or on vessels. Liquid is discharged from the underside of the tubes. This distributor is not suited for liquids containing solids or contamination.

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12

Liquid distributors for further applications

Extraction distributor VRX The distributor VRX is a two-stage distributor for use in packed liquidliquid extraction columns. Its special design, specific for continuous and dispersed phase, prevents emulsions from occurring, even when surface tensions are low.

0600 2511-1

Radial distributor VFS The distributor VFS was developed and especially designed for emulsions and liquids with high solids contents. It uses open, radial channels with deflector plates to direct the liquid onto the packing.

The distributor is a cost efficient solution for applications where somewhat increased liquid maldis-tribution can be tolerated.

0600 2502-1

Slotted distributor VES The distributor VES is used to distribute liquids containing catalyst residues. It uses open channels with lateral slots and deflector plates to distribute the liquid.

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13

Liquid distributors

Outlet hole sizes in distributor channels The following table enables the determination of approximate distributor channel hole sizes at normal liquid loadings.

The hole size can be roughly determined in relation to the liquid load and the required drip-point density. The choice of drip-point density must be made in accordance with the specific surface area of the packing used. Exact hole sizes will be

VEP splash-plate

determined by Sulzer Chemtechâ&#x20AC;&#x2DC;s specialists after all necessary parameters have been defined. In this way your distributor will be con-figured to match your application and achieve optimal hydraulic conditions.

0 2 hole size (mm)

Drip point density (VD) figures consider the distribution effect of the splash-plate.

4 6 8 10 12 0

5 VD 80

10

15 L (m3/m2h)

VD 160

20

25

VD 200

30 VD 330

0 hole size (mm)

Hole sizes in other distributors

4 8 12 16 20 0

20

40

60 L (m3/m2h)

80

100

120

Distributor test rig All Sulzer Chemtech liquid distributor configurations are routinely performance tested in Sulzer Chemtechâ&#x20AC;&#x2122;s liquid distributor test rig prior to delivery. Minimum and maximum flow rates measurements are always performed. Surface area measurements are possible, with the detection of standard deviations.

Distributor test rig

14

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Liquid collectors

Vane collector SL The collector SL is used as a separate unit to accumulate liquids from packed sections within a column.

This collector requires a ring channel welded to the column wall.

The pressure drop of this collector is negligible.

0600 2509-2

Collector support grid SLT The collector SLT combines a packing support grid with a vane collector. As a packing support, it can support the direct load of packings with surface areas up to 350 m2/m3.

For finer packings, additional drip plates are used.

This non-welded collector SLT is often used in applications where space between packed beds is critical. This collector requires a support ring inside the column.

0600 2509-4

Collector SLF The collector SLF is designed to be installed between the column flanges in smaller flanged columns.

0600 2509-1

15

Liquid collectors

Chimney tray collector SK The collector SK is an established and versatile accumulator tray design, available either as bolted or sealwelded construction. It is generally used in large diameter columns with high liquid loads.

0600 2506-1

Pressure drop is a function of the type and configuration of the chimneys. Sulzer Chemtech specialists can design your collector SK to your process specifications. Whether you need a total draw-off, a flash tray, a gas distribution device, or a unique chimney configuration, the collector SK can be custom designed to meet your specific application needs.

16

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Support and locating systems

Support grids TEB / TSB TEB and TSB are used with structured packings. Both require support rings to be welded to the column wall. TEBâ&#x20AC;&#x2DC;s are grids for flanged columns. The segmental grids of the TSB pass through manholes and are clamped together for convenient installation. The grid is a non welded construction.

TEB and TSB support grids are ideal for applications requiring expensive alloys.

Certain high performance packings require additional drip plates.

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Support grids TE / TS TE and TS are intended for structured packings with surface area over 350 m2/m3 packing volume.

They are designed with drip plates to prevent premature flooding of the packing.

These support grids rest on support rings or gussets welded to the column shell. For columns over 3 m ID, additional supports and major beams may be required.

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Random packing support grid GIS / EMS GIS and EMS are used with random packings and serve as gas injection trays to distribute the gas to bottom layers of the packing. Both grids have an open cross sectional area of 0%, GIS and EMS differ only in their overall height.

EMS is used in small column up to 1.2 m diameter. GIS is used in larger diameter columns.

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Retaining grid for random packings RPB Retaining grids, consisting of wire mesh welded to the underside of grid frames, are required above random packing beds. Such grids may be either suspended from a liquid distributor above it or bolted to a support ring welded to the column wall.

0600 2513-5

17

Gas inlet systems

When preparing column specifications, the method of feeding the column, drawing off liquids, and removing gases must not be over-looked. They are as important as se-

lecting of the optimum packing and matching it to the proper internals to get peak performance from your packed column.

Owing to years of experience and continuous development at Sulzer Chemtech, we are always in a position to offer you both standard gas inlet systems and specialty tailored solutions based on CFD studies.

Gas inlet systems

GITV

0600 2505-1

0600 2505-3

Cyclon inlet GD Open inlet

CFD-simulations to analyse and improve vapour distribution

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GIG

0600 2505-2

Tube inlet GDP Splash plate inlet GIV Vane inlet 18

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Liquid inlet systems

Liquid inlet systems LRR inlet

LV inlet

Super-heated liquid feeds

100% liquid feeds to small diameter columns

0600 2504-2

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LV (2) inlet

0600 2504-1

100% liquid feeds to larger diameter columns

LRP inlet

0600 2504-3

Liquid feeds containing gases

19

Headquarters P.O. Box 65 8404 Winterthur, Switzerland Phone +41 52 262 50 28 Fax +41 52 262 01 82 chemtech@sulzer.com www.sulzer.com

North and South America Sulzer Chemtech USA, Inc. 1 Sulzer Way Tulsa, OK 74107, USA Phone +1 918 446 6672 Fax +1 918 446 5321

Sulzer Chemtech Ltd, a member of the Sulzer Corporation, with headquarters in Winterthur, Switzerland, is active in the field of process engineering and employs some 3500 persons worldwide.

Sulzer Chemtech is represented in all important industrial countries and sets standards in the field of mass transfer and static mixing with its advanced and economical solutions.

Asia, Pacific Sulzer Chemtech Pte. Ltd. 10 Benoi Sector 629845 Singapore Phone +65 6515 5500 Fax +65 6862 7563

The activity program comprises: • Process components such as fractionation trays, structured and random packings, liquid and gas distributors, gas-liquid separators, and internals for separation columns • Engineering services for separation and reaction technology such as conceptual process design, feasibilities studies, plant optimizations including process validation in the test center • Recovery of virtually any solvents used by the pharmaceutical and chemical industry, or difficult separations requiring the combination of special technologies, such as thin film/short-path evaporation, distillation under high vacuum, liquid-liquid extraction, membrane technology or crystallization.

• Complete separation process plants, in particular modular plants (skids) • Advanced polymerization technology for the production of PLA and EPS • Tower field services performing tray and packing installation, tower maintenance, welding, and plant turnaround projects • Mixing and reaction technology with static mixers • Cartridge-based metering, mixing and dispensing systems, and disposable mixers for reactive multi-component material

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Legal Notice: The information contained in this publication is believed to be accurate and reliable, but is not to be construed as implying any warranty or guarantee of performance. Sulzer Chemtech waives any liability and indemnity for effects resulting from its application.