The CANSOLV SO2 Scrubbing System controls emissions and captures additional value from the SO2 emitted in various flue gas streams, such as those generated by fluidised catalytic cracking units, process heaters and boilers, sulphur plants and spent acid regeneration units.

The SO2 can be recycled to the sulphur recovery unit to produce marketable sulphur or it can be converted to sulphuric acid in a sulphuric acid unit and sold into acid markets.

CANSOLV SO2 Scrubbing System Benefits

  • High performance – sulphur recovery efficiency of 99.9+%
  • SO2 emissions as low as 10 ppmv
  • Varying inlet SO2 concentrations delivered as a continuous and steady product stream through load-leveling
  • Lower operating costs than traditional Flue Gas Desulphurization
  • Low Capex cost sensitivity to changing sulphur content in fuel or process raw materials

Process Description

This patented technology uses an aqueous amine solution to achieve highly efficient, selective absorption of SO2 from flue gas. The key process steps are:

  1. Feed gas is quenched and saturated in a circulated water pre-scrubber.
  2. The gas contacts the lean amine solution in a counter-current absorption column.
  3. SO2 is absorbed and the treated gas exits the absorber to atmosphere.
  4. SO2-rich amine from the absorption column is pumped through a lean–rich amine heat exchanger for energy recovery and on to the regeneration column.
  5. Steam stripping regenerates the lean amine solution, and the SO2 is recovered as a pure, water-saturated product.
  6. Lean amine is pumped from the stripper reboiler to the absorption column through the lean–rich amine heat exchanger and the lean amine cooler.
  7. By-product SO2 is directed to by-product management systems and is converted to various products, including liquid SO2, sulphuric acid and elemental sulphur.

More in Shell Cansolv

CANSOLV carbon dioxide (CO2) capture system

Cansolv's CO2 capture technology is highly adaptable to a wide variety of industrial applications, gas flow rates and carbon dioxide (CO2) concentrations. The system employs a regenerable solvent and utilizes a proprietary amine technology.

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