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Metering gas in biogas plants

| By Chemical Engineering


Metering gas in renewable energy plants with Swirl flowmeter FSS430, FSS450

Design Description
For a direct energy metering the design has to consist of a methane analyzer to measure the volumetric methane content of the gas and a flow meter installed in the line to the engines to measure volumetric flow rate in standard volume units, e.g. standard cubic meter or standard cubic feet.

For that pressure and temperature of the gas need to be compensated, either in the flow device directly or in a flow computer. Simple systems could consist of a flow meter with integrated temperature and pressure compensation by using a remote pressure transmitter to measure and totalize volume flow only.

Product Description
The ABB SwirlMaster can be selected to measure the quantity of gas flowing to the gas engines. This flowmeter measures actual volume flow rate of the fuel gas independent of the gas composition at an accuracy of ±0.5 %.

This unique measuring principle is ideal to meet not only the accuracy and flow range requirements of the application, but also due to its lack of sensitivity to long up- and downstream sections, it can be installed almost at every installation place.

The volume flow rate can be communicated to the flow computer via a pulsed signal output, Modbus or simple 4 to 20 mA analogue output. The FSS450 provides specific operation modes for net methane measurement and totalization and can read in analog signals from a gas analyzer directly.

Application and requirements
Low pressure volumetric flow measurement of biogas, landfill gas or coal mine gas

  • Very limited straight up and downstream pipe sections
  • Accuracy and repeatability at all flow rates, across the total flow range
  • Required accuracy for instruments < 1 % of measurement — IEC Ex (zone 1) certification – flameproof Ex d and Ex ia — Polluted, wet gas with changing composition