The commissioning of the boiler plant continued. The first ignition tests with fuel oil were carried out on the large construction site in order to test the oil burners. These were a prerequisite for the subsequent start-up of the steam generator. Each individual oil burner had to be adjusted and checked for safety.
Another important stage was reached in June with the first continuous oil fire: RDK8 generated steam in the boiler for the first time. Among power plant operators, these first operating days with continuous fire are also referred to as protective layer operation. In this phase, a stable protective layer is formed inside the boiler tubes. This is important for a long service life of the tubes. One week after this first steam generation, the coal burners were also ignited for the first time in order to increase the boiler output for the diversion operation. During bypass operation, the steam generated in the boiler is fed directly past the turbine into the condenser. The purity of the steam in this phase is not yet sufficient to direct it to the turbine.
With the hot commissioning of the boiler, increasingly more extensive systems are being operated. The cooling tower will also be used for the first time in run-off operation and shows that it can effectively reduce the cooling water temperature before discharge into the Rhine – this is important in future operation of the power plant in order to conserve the river and the fish living in it.