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Rheinhafen steam power plant in Karlsruhe

At the site of the Rheinhafen steam power plant in Karlsruhe – RDK for short – a new coal-fired unit is being built east of the existing plants: RDK 8 The new RDK 8 power plant is an essential component of an environmentally friendly energy supply. With a multitude of technical innovations, RDK 8 will set a new global standard for the efficient and thus environmentally friendly generation of electricity and district heating from hard coal.

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Innovation to protect people and the environment

The flue gas desulphurisation plant in 2011: It is part of the highly effective cleaning systems of RDK 8 and removes the sulphur oxides from the flue gas.

As a generation company, we are aware of our special responsibility for climate and environmental protection. That’s why we have relied on many innovations in the construction of RDK8 and can thus achieve even better protection for people and the environment:

  • A modern firing concept reduces nitrogen oxide formation and excess air during combustion and increases boiler efficiency.
  • The use of a new blade geometry increases the internal turbine efficiency.
  • The efficiency of the entire plant is increased with a wet stack without flue gas reheating.
  • In addition, RDK 8 offers the possibility of retrofitting a CO₂ separation plant (CCS).
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Do you have any questions about the new RDK construction? Then write to us!

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Efficient flue gas cleaning for high air quality

Rarely seen: The spray levels of the new RDK8 flue gas desulphurisation plant

“Primary measures” ensure an optimum combustion process. In this way, the formation of nitrogen oxides (NOx) and carbon monoxide (CO) can be largely prevented, and a good burnout of ash can be achieved.

In addition, highly effective cleaning systems remove dust, nitrogen oxides, and sulphur oxides from the flue gas (secondary measures). The purified flue gas is discharged into the environment via a 230-metre-high chimney. The fly ash from the electrostatic precipitator, the gypsum from the desulphurisation plant, and the boiler ash are recycled in the building materials industry.

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Downstream of the boiler plant is a secondary nitrogen oxide reduction system. In this selective catalytic reduction plant, gaseous ammonia is injected into the flue gas stream as a reducing agent. The nitrogen oxides are transformed into harmless nitrogen and water vapour.

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A highly effective electrostatic filter ensures that the dust contained in the flue gas is almost completely separated. For this purpose, the dust particles contained in the flue gas stream are electrically charged so that they can be deposited at the collecting electrode and separated from the flue gas.

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In the flue gas desulphurisation plant, the flue gases are sprayed with a limestone suspension in a wet scrubbing process. During the washing process, the sulphur oxides of the flue gas combine with the lime to form calcium sulphite, which is then mixed with air to form gypsum in the scrubber sump.