ERG (Air Pollution Control) Ltd

- Gas Scrubbing

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V-tex is an outstanding scrubbing and stripping technology, providing users with a highly efficient scrubbing/stripping unit operation, in a fraction of the height of a traditional packed tower. And thanks to the opposed-jet spray nozzle at the heart of the technology, V-tex offers flexible, robust operability and unrivalled, maintenance-free availability, across a wide variety of applications.

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V-tex gas scrubber technology was first employed in response to the tough gas scrubbing requirements in the nuclear industry to scrub both gaseous and particulate contamination while minimising the risk of fouling the scrubber internals and spray nozzle blockages, thereby minimizing maintenance downtime and reducing worker exposure risks to hazardous maintenance activities

With the partial privatisation of the UK nuclear industry in the 1990s, this unique patented technology has become available for other gas scrubber applications across other process industries, where it is particularly suited to gas scrubbing challenges where traditional packed tower and tray scrubbers cannot cope, or where space is limited.

Over the last 15 years, the technology has been developed and improved and today there are more than 400 V-tex gas scrubbers and gas strippers in successful operation across a broad range of process industries and leading global companies.

The secret to the success of the V-tex gas scrubber is its simplicity of design and the innovative technology of its scrubbing liquor spray nozzles. The scrubber vessel itself is an empty cylindrical chamber. The foul gas is fed into the chamber radially setting up a vortex flow motion as it circulates inside the vessel. The scrubbing liquor is fed into the heart of the gas vortex via a pressurized feed through opposed jet nozzles which create an array of fine droplets. High intensity mixing of gas and scrub liquor droplets takes place in the vortex, setting up the conditions for highly efficient mass transfer between the gas and the scrub liquor. The now dirty liquor is then “flung” to the walls of the chamber where it then falls to the collection chambers at the bottom of the vessel. Meanwhile, the clean gas exists through the roof of the chamber. This high energy / high intensity gas-liquid contact means that a V-tex gas scrubber can be sized at about 30% of the height of a traditional packed tower gas scrubber. V-tex gas scrubbers require less maintenance as with no internal packing they do not require the long periods of downtime for packing cleanout and renewal associated with traditional packed tower scrubbers.

V-tex gas scrubbers also have an asdditional major advantage over packed tower scrubbers as scrubbing efficiency is largely independent of gas flowrate, making them suitable for batch applications where the gas flowrate can vary widely from zero to full flow. Under these conditions, traditional scrubbers would struggle as packed towers typically require stable gas flows to maintain a good distribution of liquor and to avoid liquor channeling through the packing

V-tex gas scrubber technology is available from ERG and its global network of licensees.

We also have a number of V-tex pilot plants, which are available to be installed at customer sites for pilot trials, to prove the V-tex technology for customer specific applications. These are especially useful for proving the V-tex technology for customer specific gas scrubbing applications and can be a valuable asset in the of evaluation of different process routes and for generating the base data to build a business case for a full scale project investment.

Whether the requirement is for cleaning tars from biogases generated from a hot gasification process, or sulphurous compounds or VOCs from biofuels generated from an anerobic digestion process, V-texTM can be the solution.

  • Gasification of waste bio-materials (eg, wood chips) produces a hot fuel gas that is cooled and cleaned and then fed into an engine driving a power generator. As the gas is cooled the tars present begin to condense (usually 90-120°C) forming viscous sticky liquids that cause fouling.  V-tex offers the power plant engineer a self-cleaning, high-efficiency, compact heat-exchanger that will remove all condensibles ahead of his blower or compressor.
  • Biofuel gases can be produced from sewage works, landfill sites and by the anaerobic digestion of organic waste materials. These gases are cool so contain fewer condensibles. Instead, they contain other compounds that can foul blowers, compressors or engines including sulphurous compounds (eg. H2S, mercaptans) or VOCs (eg. styrenes, xylenes). Once again, the power plant engineer needs a self-cleaning, high-efficiency, compact reactor that will remove these compounds from the fuel gas. V-tex can remove any of these by careful selection of scrubbing-liquor.

The diagrams  below explain the operation of the V-tex technology.

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The V-tex offers robust operation, using even dirty and solid-laden liquor streams, making it the scrubber of choice for arduous applications and where high availability, low maintenance operation is essential.

  • High availability and minimal clean-out costs as no internals to foul
  • Consistent, predictable mass- and heat-transfer rates provided by self-cleaning, non-clogging nozzle
  • Low installation costs, especially when retrofitting into existing buildings, because of low height
  • Smaller volumes of spent liquor to be sent to waste as V-tex can scrub with viscous liquors and slurries
  • High efficiency performance irrespective of gas flowrate means no narrow window of operation limiting your production cycles
  • Proven in a wide range of applications

  • Opposed jet nozzle in centre of chamber
  • Fine droplet spray pattern for high mass transfer
  • Induced swirl from tangential gas inlet and central gas outlet
  • Integral sump separated by lower chamber plate
  • Droplet elimination by spray plate

V-tex technology is widely used for challenging environments such as:

  • Difficult scrubbing applications often with recovery and/or manufacture of saleable bi-product
  • Stripping of contamination from liquor/slurries and recovery
  • Condensing particularly when the gas/steam has suspended particulate

For applications where the scrubber height is important, such as pharmaceutical and microelectronics production, the V-tex is able to fit on a single storey.   The diagram shows an example of a packed tower and V-tex scrubber both sized for 1,000 m3/hr and 99.5% removal of HCl.

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