The Kehl II biomass CHP plant generates electricity and supplies the turbine exhaust steam as process steam to a neighbouring paper mill.
Thermal input
Steam output
Electrical output
Challenge
At the Rhine port in Kehl, a combined heat and power plant was to use waste wood of categories A I and A II as well as fresh wood and supply a paper mill with steam.
Solution
The fuel is tipped at enclosed truck unloading points, freed of oversized pieces and ferrous and non-ferrous metals, and stored in two silos of around 3,000 m³ each. A reciprocating grate firing supplies the boiler with 23 t/h of live steam at 78 bar and 470 °C. The flue gases are cleaned by dry sorption with hydrated lime and hearth furnace coke.
Result
Since March 2011, the plant has generated just under 3 MW of electricity; the back-pressure steam at 7.5 bar goes to the paper mill. The boiler efficiency is 89%.
Technology
Kehl, Germany
- Fuel
- Waste wood A I–A II, fresh wood
- Firing system
- Reciprocating grate
- Thermal input
- 19.91 MW (gross)
- Steam output
- 23 t/h
- Live steam
- 78 bar / 470 °C
- Back pressure
- 7.5 bar (a) at approx. 180 °C
- Electrical output
- just under 3 MW
- Boiler efficiency
- 89 %
- Flue gas cleaning
- Dry sorption with hydrated lime and hearth furnace coke
- Commissioning
- March 2011
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