Hydrogen sulphide (H2S) is formed in during the anaerobic digestion of sulphur containing molecules. The Hydrogen sulphide (H2S) concentration depends on the composition of the feedstock and concentrations up to 10,000 ppmv have been measured

Problem

During the combustion in the engine hydrogen sulphide is oxidised to SO2/SO3 that can cause corrosion and lead to quality reduction of the engine lubricating oil. This will lead to increased maintenance cost and therefor Hydrogen sulphide (H2S) is often removed with impregnated activated carbon using mobile filter units

Case study

At a biogas plant Jacobi was asked to come up with a solution to treat a biogas with following characteristics:

Biogas Flow: 150-250Nm³/h

Temperature 25-30°C

Relative humidity: 50-80%

Dew point +/- 16°C

Biogas pressure at the inlet the filters: 1.2-1.3 bara

Biogas composition (expressed on dry gas)

Component Formula Composition
Methane CH4 56%
Carbon dioxide CO2 43,50%
Oxygen O2 0,20%
Nitrogen N2 0,40%
hydrogensulphidee H2S 200 ppm
Volatile organic compounds VOC < 100 mg/Nm3
Ammonia NH3 < 5 mg/Nm3

Based on the data the above data a mobile activated carbon filter EcoFlow™ C1 with AddSorb™ SX100 was proposed. Under these conditions Sulphur loadings of more than 60%W/W can be obtained.

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