Success story of Bioenergie Riedlingen GmbH with Eisele agitators with IE5 energy-saving motor

Bioenergie Riedlingen GmbH has been operating its biogas plant in Baden-Württemberg since 2012 with an installed capacity of 2.4 megawatts. This plant, operated by a producer association of 19 farmers, comprises six large containers, two fermenters, a secondary fermenter and three final storage facilities. The plant is operated thermophilically, which means that it works at a container temperature of around 52 degrees Celsius and a dry matter content of up to 13 percent.

In the past, Bioenergie Riedlingen GmbH had to contend with several challenges. The agitators previously used were not up to the demanding conditions and frequently overheated, which led to high setup costs and assembly effort. In addition, the stirring result was inadequate and the power consumption of the devices was relatively high.

To solve these problems, Bioenergie Riedlingen GmbH decided to use Eisele agitators. Six Eisele submersible agitators with IE5 energy-saving motors have now been in use for over a year. Two GTWSB 206-E agitators and another with a large propeller work in the secondary fermenter with dimensions of 27x6 meters, while in the second final storage facility 2 (32x8 meters), three more Eisele GTWSB 206-E agitators do their job reliably.

The decision to use Eisele agitators was made due to the outstanding product properties. The devices are approved for substrate temperatures of up to 65 degrees Celsius, which almost excludes overheating. The heavy, solid cast housing optimally dissipates the resulting motor temperature to the substrate, which prevents the motor from overheating. The permanent magnet motors achieve an efficiency of up to 96 percent in all speed ranges, which enables optimal thrust without loss of torque. In addition, the agitators work remarkably quietly and generate less vibration, which underlines the quality and durability of the devices.

Another plus point was the competent advice from Eisele, which ranged from the technical design of the agitators in the individual containers to the completion of the project. The advice on BAFA funding is particularly noteworthy. Eisele's IE5 motors are directly funded, so no additional energy consultant or energy concept was required.

Since installing the Eisele agitators, Bioenergie Riedlingen GmbH has reported trouble-free operation and significantly improved operational reliability. The energy savings are around 40 percent, which led to a significant electricity saving in the five-digit euro range for six agitators. In addition, the operators have achieved a significantly better gas yield thanks to the homogeneous container substrates. The propeller speed can be individually adjusted to the requirements of the substrate without any loss of efficiency.

Mr. Traber, the operations manager of Bioenergie Riedlingen GmbH, particularly emphasizes the in-house motor production of the Eisele company, which is the only manufacturer in the world to produce these IE-5 synchronous motors. Due to the high quality, operational reliability, durability and energy efficiency, he recommends the Eisele agitators without reservation. The Eisele agitators have proven to be a decisive factor in the efficiency and success of our biogas plant.