Clean fossil fuel heat and power plants - General information

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Post combustion

Figure 1 illustrates a post combustion process. Most of the CO2 in the flue gas from a fossil fired power plant is extracted in a CO₂ separation unit. The CO₂ produced in the separation unit is compressed to a delivery pressure in a compressor unit. An advantage with post combustion capture is that it can be applied to existing plants.

Figure 1: Post combustion.

Figure 2 shows an example of a post combustion CO₂ separation unit. Monoethanolamine (MEA) is a suitable amine for post combustion capture.

The CO₂ in the atmospheric flue gas is attached to the amine solvent in the absorber tower under a relative low temperature and the CO₂ is released from the amine solvent in the stripper tower at a relative high temperature. In this process, it is normal to absorb between 80 and 90 % of the CO₂ from the inlet gas stream.

The separation unit requires heat supply to the reboiler and work to drive the fan and pumps of the system. Nebb has developed CESAm, an oxyfuel process that supplies heat and power to a post combustion CO₂ separation unit.

Figure 2: CO₂ separation unit.

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