Renewable energyBiogas

Biogas from digesters is typically 60–70% methane and 30–40% carbon dioxide. Biogases fuel engine-generators or gas turbines to produce electricity. They also fuel boilers to produce heat or steam. Biogas utilization has increased in industrial processing, wastewater treatment plants, municipal landfills, and livestock farms.

Biogas level and flow applications

• BIOGAS FLOW: In all forms of biogas production, safe and reliable
  gas flow measurement is essential in the collection, disposal or re-use
  of biogas. Thermal mass flow meters are widely used in landfill,
  anaerobic digestion and gasification processes. A flow meter measuring
  biogas must provide low flow sensitivity, low pressure drop, and
  tolerate temperature and pressure changes.
• SCRUBBER VESSEL: Essential in gasification processes, scrubbers
  remove odors, pollutants, acid gases and chemical wastes from biogas.
  Accurate level monitoring of the scrubbing water necessitates a control
  to automatically feed the correct amount of make-up water to the recycle
  reservoir either continuously or on a periodic basis. The level
  monitoring device for water-out control should be equipped with a level
  alarm.
• BIOGAS DEHYDRATION: As biogas emerges from a digester or a landfill
  it is saturated with water that causes corrosion problems upon
  condensation. Dehydration systems using air, vacuum and desiccant
  processes to remove water typically include a holding tank for water
  drawn off the gas with a level control actuating a valve to vacate the
  tank at high level. Biogas is dehydrated according to the customer’s
  specifications for maximum water content. Some uses, such as boiler
  fuel, require an extremely dry gas.