Ethanol

A major chemicals and mineral oil company runs a mixing plant for E5 and E10 fuels. Here the ethanol is fed in doses into a main flow of petrol. The petrol is delivered in tanker vessels. A pump transports the petrol to a storage tank on land from the vessel. Ethanol is added to the petrol on the way to the storage tank (5% for E5 or 10% for E10). The chemicals and mineral oil company requires a pump for this procedure. The customer uses the Boerger Rotary Lobe Pump in an ATEX version.

The ethanol is delivered in tanker vehicles. The Boerger Rotary Lobe Pump draws off the ethanol via a storage tank security wall (3m). To ensure an exact dosage even when the petrol pump output varies, the speed of the Boerger pump is controlled by frequency converter. A magnetic flow meter (MID) measures the amount of pumped petrol. A corresponding control unit regulates the frequency-dependent speed control. This guarantees an exact mixing ratio of ethanol and petrol.

As the air quality control requirements are applicable here, a pressure gage was installed on the pump quench chamber to shut down the pump if pressure fluctuations occur in the quench chamber. PTFE lip seals were also fitted. This ensures the pump is permanently technically sealed in accordance with the air quality control requirements.

Technical data