Last edited 12 Mar 2020

Carbon capture processes

Contents

[edit] Introduction

Carbon capture is a process that can remove as much as 90% of the carbon dioxide (CO2) gas emitted from fossil fuel (coal, oil or gas) power stations which are the main source of anthropogenic CO2 emissions. But the process is also used in cement making and other industries, and can be used to extract carbon from the atmosphere.

Carbon capture has been used for decades by the oil and gas sectors, although long-term storage of CO2 is a relatively new activity. It is thought that carbon capture could achieve around 20% of the total greenhouse gas emissions reductions needed to achieve 2050 targets. It is seen as one of the few practical ways to efficiently decarbonise the industrial sector quickly.

[edit] Carbon capture and storage (CCS)

CO2 captured from industrial processes is captured for secure and indefinite storage. In the UK storage of large quantities of CO2 is likley to take place in offshore underground saline formations or depleted oil and gas fields.

Although at the time of writing there are around 17 operating CCS projects globally, there are no commercial-scale CCS projects in the UK, but relevant health and safety regulations exist for future operators to abide by.

There are three stages to carbon capture and storage:

  1. CO2 is trapped and separated from other gases.
  2. CO2 is transported to a storage site.
  3. CO2 is stored away from the atmosphere.

[edit] Trapping and separating CO2

There are three ways to extract CO2:

It may also be possible to extract CO2 from ambient air (direct air capture), although it is more difficult than the aforementioned processes due to the lower concentration of the gas in air. Work on this is still at an early stage.

[edit] Transportation of CO2

Once captured, CO2 must be transported to suitable sites for permanent storage. Conveyance is mostly by pipeline as this is one of the cheapest methods for large volumes. CO2 can also be transported – eg by ships – to other locations for industrial use.

[edit] Storing CO2

The three techniques available for storing CO2 are:

  • In deep geological formations.
  • In deep ocean water.
  • In the form of mineral carbonates (mineral storage).

For more information see: http://www.bgs.ac.uk/discoveringGeology/climateChange/CCS/howcanCO2bestored.html

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