Demonstration plant at the Fenne power station

From as early as the start of 2009, the DeVeTec ORC has been using the waste heat from a large engine which is operated using mine gas. A partial flow is tapped from the exhaust gas flow of the engine, and this transfers a large part of its heat to the working medium, ethanol, in a 7 m high evaporator. A maximum heat output of 1.3 MW is extracted from the exhaust gas system (shown in red in the top image). The temperature of the exhaust gas flow is more than 400 °C. The ethanol flows in the circuit marked in green on the image below, and has a temperature of up to 300 °C.

In spite of the flammability of ethanol, since commissioning, the DeVeTec ORC system has been running safely without supervision in an environment which sets the most demanding requirements in terms of safety of industrial equipment.

The cooling water (marked in blue in the top image) flows out of the condenser at a maximum of 90°C. Because of its high temperature, which is never less than 75°C, it can be used for other purposes, such as heating, drying, or cooling (after adsorption). In the Völklingen-Fenne power station, for example, it heats the cooling water for the condenser preheating of the power plant units, and thus increases the overall efficiency of the plant.    

At the same time, various functions are continuously and successfully put to the test:
- Direct evaporation
- Partial load capability
- Supervision-free operation
- Safety concept

From as early as the start of 2009, the DeVeTec ORC has been using the waste heat from a large engine which is operated using mine gas. A partial flow is tapped from the exhaust gas flow of the engine, and this transfers a large part of its heat to the working medium, ethanol, in a 7 m high evaporator. A maximum heat output of 1.3 MW is extracted from the exhaust gas system (shown in red in the top image). The temperature of the exhaust gas flow is more than 400 °C. The ethanol flows in the circuit marked in green on the image below, and has a temperature of up to 300 °C.

In spite of the flammability of ethanol, since commissioning, the DeVeTec ORC system has been running safely without supervision in an environment which sets the most demanding requirements in terms of safety of industrial equipment.

The cooling water (marked in blue in the top image) flows out of the condenser at a maximum of 90°C. Because of its high temperature, which is never less than 75°C, it can be used for other purposes, such as heating, drying, or cooling (after adsorption). In the Völklingen-Fenne power station, for example, it heats the cooling water for the condenser preheating of the power plant units, and thus increases the overall efficiency of the plant.    

At the same time, various functions are continuously and successfully put to the test:
- Direct evaporation
- Partial load capability
- Supervision-free operation
- Safety concept