Presentation on theme: "Gas analysis and gas flow measurement in a biogas plant"— Presentation transcript:
1 Gas analysis and gas flow measurement in a biogas plant Energy from Biomass and BiogasGas analysis and gas flow measurement in a biogas plantHo Chi Minh City, 16 September 2013
2 Gas analysis and gas flow measurement in a biogas plant Introduction company BINDERThermal dispersion mass flow measurementTypical challenges and solutionsSummary and conclusions
3 Binder Group www.bindergroup.info Binder Group AG Finance Holding Binder Engineering GmbH Sales & Service Companies in DE / F / CH / NL / B / Singapore, ChinaBINDER GmbH Manufacturing Company for Gas Flowmeter, Gas Analyzer and Control Systemswith following products: COMBIMASS® / VACOMASS® / CAMASS®INSTRUM AG Manufacturing Company for Stainless Steel Pressure Regulators and ValvesBETA B.V. Manufacturing Company for Pressure and Temperature Switches
6 Basics of thermal dispersion technology The principle:Gas flows by a heated sensing element and causes cooling down of the element by the mass flow (molecules)direct mass flow measurement, unaffected by gas pressure and temperature changesMeasurement is based on a PT 100, an additional non-heated sensor is used as a reference.The amount is directly related to the mass flow.
7 Typical challenges in biogas applications Outdoor installation – operation for years under the sky – rain, direct sun light, snow, ...biogas is highly corrosivebig plants – long distances between the measuring pointsignition potential of methane-air-mixturethe concentration of methane is changing in the biogasbiogas has a high percentage of water vapour (at the top of the digester 100% relative humidity) and contains beside others H2S and NH3
8 Typical challenges and solutions Outdoor installation – operation for years under the sky – rain, direct sun light, snow, ...biogas is highly corrosiveRugged stainless steel designSensors are corrosion-proof and resistant against moisture and dirtNo mechanical moving parts
9 Typical challenges and solutions The concentration of methane is changing in the biogas(e.g. density changes can cause 2…3% failure)In combination with a gas analyser station the changing gas composition can be corrected in the flow signal
10 Typical challenges and solutions biogas has a high percentage of water vapour (at the top of the digester 100% relative humidity)Humidity correction by either1. Temperature Method2. Dew-Point Method
11 Humidity Correction1. Temperature MethodBased on temperature of the biogas and assuming a relative humidity of 100% the water contents can be calculated by standard method – can be used only directly after the digester. Even if a gas cooler is used to dry the gas, directly after the gas cooler the gas is 100% water damp saturated. But gas temperature mustn't be increased due to blowers, direct sun light etc. In these cases temperature method will calculate a wrong (too high) water damp portion.2. Dew-Point MethodUsing a special probe, the relative humidity and so the water contents can be determined. The probe is sensitive against H2S, therefore it can be used only after the filter at very low H2S-concentrations.
12 Summary and Conclusions Conditions in biogas plants request solid and reliable designed products for a safe and stable operationThermodynamic and Chemical properties of biogas require sophisticated measurement & control equipmentCombination of gas flow and gas analyser ensures an efficient, reliable and profitable operation of the biogas plant
13 Questions / Remarks?We are happy to receive your feedback, questions and remarks.Jan TalkenbergerManager International SalesBinder GmbHBuchbrunnenweg 1889081 Ulm, GermanyEddy EngManager South East AsiaBinder Instrumentation Pte. Ltd25 International Business Park,# German CentreSingapore