Heat recovery from corrosive biogas combustion in combined heat and power (CHP) plants
Biogas heat transfer solutions
Utilizing the raw biogas
Biogas is an energetic gas mixture that is produced during the natural decomposition of organic materials in the absence of air. This decomposition process is used in biogas plants to generate biogas from biomass-containing residual materials, farm manure or unused plant parts.
In addition to electricity generation, biogas is also used to generate heat. The heat is generated by utilizing the raw biogas in CHP plants. The thermal efficiency of CHP plants is generally between 34 and 55 %. By utilizing the CHP waste heat, the overall efficiency can be increased to up to 90 %.
High heat recovery performance
Our customer and partner BOMAT Heiztechnik GmbH has currently installed more than 30 Profitherm Modular exhaust gas heat exchangers (Figure 1) at approx. 20 biogas plants. This heat exchanger is characterized by simple cleaning possibilities by means of slide-in registers.
Together with heat transfer surfaces produced by Technoform, the exhaust gas heat exchangers achieve a high heat recovery performance. Heat recovery occurs below the acid and water dew point due to the acid and corrosion resistant heat transfer surfaces. This heat energy can be used to heat process water and rooms or to feed into the local or district heating network.
More than 30 Profitherm Modular exhaust gas heat exchangers equipped with heat transfer surfaces by Technoform are installed at 20 biogas plants
Temperature evaluation at the heat exchanger at a field test facility in southern Germany
Technoform and Bomat Heiztechnik GmbH equipping a data logger on a heat exchanger in southern Germany to collect the following Real-time data
- gas inlet temperature
- gas outlet temperature
- water inlet temperature
- water outlet temperature
- Pipe wall temperatures (high-temperature coil heat exchanger 3)