Application

Anaerobic degradation processes happen in the digestion tower during wastewater treatment in a sewage plant, causing biogas (also sewage or fermentation gas) to arise, which mainly consists of methane and carbon dioxide. 

Exact measuring of biogas quantity is one oft he most challenging applications in flow measuring technology. Biogas is very moist, tends to condensate and is particle-laden. Its composition varies and is quite aggressive. Combined with air it can turn into explosive mixtures which is why it’s important to take according safety measures. Applied instruments have to be certified for the defined ex zone

Fermentation gas is measured directly at the digestion tower’s exit and on the other side before the combined heat and power plant. Flow rate towards the flare is also partly measured.

Process data

• Measuring task: flow velocity for determining flow rate

  

• Measuring point: directly at the digestion tower’s exit and on the other side before the combined heat and power plant and before the flare
• Measuring range: Up to 40 m/s
• Process pressure: atmospheric
• Process environment: ATEX Zone 1
• Process: ATEX Zone 0