Germany's first power plant to use hot waste gas from cement production to generate electricity is being constructed at Rohrdorf, Bavaria, with a waste heat recovery system provided by a consortium of the Siemens Industry Solutions Division and Kawasaki Plant Systems. Upon completion in April 2012, the system will cover one-third of the cement works' power requirements.
Südbayerisches Portland Zementwerk manufactures cement, transit-mixed concrete, concrete goods and prefabricated concrete parts at 40 production locations in Germany and Austria. The new power plant at the Rohrdorf cement works will use the hot waste gas from the rotary kiln and the clinker cooler, as well as the residual heat from the chimney, to generate electricity.
The power plant is sized to include the future waste heat from the chloride bypass. This highly efficient and environmentally friendly project is being supported by the Federal Ministry for the Environment within the framework of its environmental innovation program. With the construction of a new raw mill and a dedusting facility, the Rohdorf plant has already made a significant contribution to climate protection.
Kawasaki Plant Systems and Siemens formed a consortium to construct the plant in order to keep responsibility for the water/steam cycle with a single party. Beforehand, all possible heat sources in the production facility were analysed and evaluated in close cooperation with Portland Zementwerk. Siemens is supplying the electrical equipment and instrumentation and control, as well as the steam turbine and the generator. Supervision of construction and commissioning are also included in the Siemens contract.
For this project Kawasaki is providing the overall plant design and engineering for the water/steam cycle — the pressure parts of the boiler, the feed water pre-heater on the clinker cooler, and the air condenser for the steam turbine.
