Comment l'utilisation d'ultrasons permet-elle d'avoir une précision élevée dans la mesure du taux de méthane dans le biogaz ?

Renewable Natural Gas
Waste Turned into
Green Energy
Smart sensor technologies to optimize
upgrading your biogas to biomethane

 Upgrading process:
Carbon Dioxide CO2 Hydrogen Sulfide H2S Crop Waste
Manure
Landfill
Biomethane CH4 Odorant Wastewater

Water H2O Feedstock Biogas
Digestion Compression & Dehydration





Gas to Grid
Biomethane
Power Generation,
Heating and CNG Fueling

H2S scrubber

Biogas Upgrading Plant
Biogas is increasingly seen as a more renewable source Operators make several measurements in these
of natural gas. Biogas is the mixture of gases produced processes. Methane, the main component in biogas,
by organic waste in the absence of oxygen. Upgrading is flammable. Oxygen will typically be kept to less
biogas to biomethane includes removing carbon than 2% for safety during storage and transportation.
dioxide and water vapor along with trace gases such Oxygen is typically measured directly after the
as nitrogen, hydrogen sulfide, and hydrogen. digester. Hydrogen sulfide is scrubbed from the gas
to trace levels. Membrane filters separate the carbon
dioxide from the methane, and the concentration
of each on either side of the membrane indicates
separation efficiency. Accurate flow metering is vital
throughout these processes, especially when there is
a change in owner from producer to user. To meet tariff
limits, water vapor is measured before biomethane
entry into the gas grid. These measurements
take place in hazardous area environments.




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 Panametrics process analyzers and flow Integrated Systems
measurement instruments have been ensuring Measurement Parameters
customer and process safety for decades. • O2 is measured in the gas generated by the
decomposition of waste to pipe the biogas
safely: <2%
As a recognized leader in moisture and oxygen A partnership with Panametrics brings you reliability
analyzers and liquid, steam, and gas flow meters with and consistency in measurement, and offers solutions • H2S scrubbed from the CH4 before entering
proven technologies, you can be sure that we provide completely tailored to your process, supported by local the networks: <10 ppm
the best combination of technology and expertise to technical teams. • CO2 is measured in the tail gas to monitor
ensure accurate process measurements. Panametrics separation efficiency from methane:
analyzers and flow meters are designed for complex Our technology and application specialists are experts 90% – 100%, balance CH4
applications that require maximum reliability and in developing the best gas analysis and flow solutions
measurement accuracy. for your measurement. Along with our global network • CH4 of the RNG for entry into the grid:
we ensure our partners receive first-class local support 90% – 100%, balance CO2
for all requirements starting from technical assessment
to commissioning and assistance.





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 Process Analyzers
XMTC XMO2
Thermal conductivity binary gas analyzer Thermoparamagnetic oxygen analyzer
With no moving parts, the XMTC provides a robust measurement of carbon With no moving parts and unsurpassed calibration stability, the XMO2 provides a
dioxide in methane with little maintenance and unsurpassed calibration stability. robust oxygen measurement in biogas with little maintenance. The transmitter uses
The transmitter uses the differences in thermal conductivity to report percent the thermal and paramagnetic properties of oxygen to generate a ‘magnetic wind’
level measurement. of oxygen to enable a reliable measurement.


FEATURES FEATURES
• Percent level measurement ranges up to 100 • Measurement ranges up to 100% O2 in gas
percent CO2 in CH4 • Flame-/Explosion-proof and
• Percent level measurement ranges up to 100 weatherproof enclosure
percent CH4 in CO2 • Push-button calibration
• Flame-/Explosion-proof and weatherproof • Compact, rugged sensor with no moving parts
enclosure
• Measurement circuit compensates for
• Push-button calibration variations in background gas composition
• Compact, rugged sensor with no moving parts • Unique dual-chamber, temperature-controlled
cell provides resistance to contamination





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 Ultrasonic Flow Meters
PanaFlow Z2G
Ultrasonic gas flow meter for hazardous area with optional
methane content determination in biogas
The biogas that comes from the digester is typically low pressure.
It is saturated with water (6% @ 40 °C) and contains CO2 (20% - 40%).
Such an application requires powerful transducers to be able to measure
this gas mixture at very low pressure.
Biomethane is the other typical measurement here, easier to handle. A recognized
Panametrics holds a strong heritage in difficult gas flow measurement
gained from flare gas experience. leader in moisture

FEATURES and oxygen
• Industrial designed flow cell to minimize flow
disturbances at optimal chord locations
• T19 high performance transducers with high
signal to noise ratio (SNR) analyzers and
• Advanced diagnostics to not just measure
flow but understand meter performance and
validate process conditions and stability
• ±1% of measurement typical accuracy liquid, steam, and
(two path), ± 1.5% accuracy (one path).
• Dedicated biogas algorithm to measure
CH4 concentration with ±2% accuracy.
This measurement requires an external gas flow meters
temperature probe input.
• Analog, Pulse, Frequency, HART, and Foundation
Fieldbus are available communication
• Available for 2” to 16” (50mm to 400mm) sizes with proven
standard (other sizes and/or special design
available upon request)
• Material of construction is carbon steel,
stainless steel, duplex stainless steel (other technologies
materials available upon request)
• Flange ratings from 150