1 / 20

Two Technical Advances in Wet Chemical Scrubbing Technology

Explore the advancements in wet chemical scrubbing technology, including V-texTM and zero-effluent scrubbers. Learn about their development, process description, applications, and case studies. Discover how these innovations optimize space, improve efficiency, and reduce environmental impact.

lmenke
Download Presentation

Two Technical Advances in Wet Chemical Scrubbing Technology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Two Technical Advances in Wet Chemical Scrubbing Technology Richard Hanson MA MEng CEng MIChemE ERG (Air Pollution Control) Ltd

  2. Introduction | Two Technical Advances • V-texTM technology • Development • Process Description • Applications and Case studies • Zero-effluent scrubbers • Process Description • Applications and Case Study • Summary

  3. V-texTM| Development • Developed in UK by AEA Technology • Used in difficult applications • reliability and performance • Eg. nuclear industry • V-texTM technology used in • Scrubbing • Stripping • Distillation • Mixing

  4. V-texTM| Development • V-texTM Scrubbing • Since early 1990s in UK and Ireland • Mid-late 1990s in USA • More than 400 systems installed • Technology is now owned by ERG • What is it…?

  5. V-texTM | Process Description • Key features • V-texTM chamber • Tangential gas inlet • Opposed jet spray nozzle • Intense mixing • Central gas outlet

  6. V-texTM | Process Description • Opposed jet self-cleaning spray nozzle • Fine droplet spray pattern • Induced swirl from tangential gas flow • Typical droplet size 100-200 μm • Large surface area for mass transfer

  7. V-texTM | Process Description • Mass transfer models • Traditional packed towers • Tower diameter = f (gas rate) • Efficiency = f (packed height) = f (HTU) • HTU = f (packing type, liquor rate, gas rate) • V-texTM • Chamber diameter = f (gas rate) • Efficiency = f (liquor rate, liquor pressure)

  8. V-texTM | Implications of transfer model (1) Non-clogging • No packing to foul • Applications for dirty gas/liquor • Scrubbing with slurries • Reliable performance, lower maintenance, guaranteed efficiency

  9. V-texTM | Implications of transfer model (2) Significantly reduced vessel height • High pseudo-Kga values • Intense mixing, high turbulence • Gas residence time reduced approx x10 for same scrubbing efficiency

  10. 7.4 m 2.2 m V-texTM | Implications of transfer model • Example: • 1000 m3/hr air • HCl removal efficiency 99.5% ERG Packed Tower Scrubber V-texTM Scrubber

  11. V-texTM | Case studies • Cl2 scrubbing • Chemical industry • Chlorine scrubbing from process air stream • NaOCl by-product for sale

  12. V-texTM | Case studies • HCl scrubbing • Pharmaceutical industry • Hastelloy C276 and ECTFE/PTFE • Pressure and explosion rating certified • >99.5% HCl removal efficiency, batch scrubbing

  13. V-texTM | Case studies • Reactive gas scrubbing + particulate removal • Optical Fibre Manufacturer • Removal of HCl and SiO2 • Scrub liquor contained up to 5% weight SiO2 with no blockage • Constant back pressure improved optical fibre quality

  14. V-texTM | Case studies • Multi-component contaminants • Tobacco Manufacturer • Steam quench/sub-cooling with NH3, VOC and dust scrubbing • Scrub liquor contained entrained dust – unsuitable for packed tower • SO2 scrubbing ex-incinerator • 12,000Am3/hr with 5,000mg/m3 SO2 • Lime slurry scrubbing • >99.8% removal SO2

  15. Zero-Effluent | Process Description • Vacuum evaporation: application to scrubbing • Established technology • Process application innovation • System integration – optimisation of capital and operating costs • Minimises water usage and effluent disposal • Simplified flowsheet • Evaporator/condenser circuit, heat pump circuit, effluent circuit

  16. Schematic courtesy of H2O GmbH Zero-Effluent | Process Description

  17. Zero-Effluent | Process Description • Typical Scrubber blowdown 500 litre/hr  < 40 litre/hr concentrated sludge waste + recovery of > 460 litre/hr process water to system • Operation at 5kPa and 40oC • Typically 0.15kW per litre water evaporated

  18. Zero-Effluent | Case study • Aerospace industry • Chromic acid scrubber • 200 litre/hr treatment rate • 200 g/litre CrO3 commodity recovery • Return on investment = 9 months

  19. Zero-Effluent | Applications • High water/effluent costs and low energy costs • Feedstock, product and by-product recovery • Minimised loading for RO and ion-exchange treatment plants

  20. Summary • Innovations in Scrubbing technology • V-texTM • Solid-laden gas/liquor applications • Space limitations • Zero-effluent • Feedstock/product recovery • Utility optimisation

More Related