Hydrogen sulfide (H2S), also called hydrogen sulfide, is always present in biogas. The concentrations differ greatly and depend on the raw materials used. Biogas has been biologically desulphurised for several years. This is done by adding air to biogas, which takes place in a separate room or directly in the gas storage.
Depending on the amount of H2S in the biogas, 2 to 6 vol. % air can be added to the biogas. When too little air is added to the biogas, "elemental sulfur" is formed as an intermediate product, which can be found as a solid in the digestate. However, if too much air is supplied, a second reaction takes place. In this process the elemental sulfur is converted into sulfuric acid. This sulfuric acid is converted back into hydrogen sulfide in (eg manure), so that no removal of this undesirable substance has taken place. In addition, biogas in air is very explosive. A measuring instrument that measures the hydrogen sulfide content in the biogas can indicate whether slightly more or less air should be added to the biogas.
The 6400TSG and the 6020L from Teledyne Analytical Instruments are able to continuously measure the hydrogen sulfide content in these concentrations accurately. However, always contact our experts for measuring the hydrogen sulfide content in biogas. It is very important that work is carried out in accordance with European guidelines such as the ATEX Directive 2014/34 / EU. Analytical instruments for these types of applications are often specially configured for the customer.
Download the brochure of the 6400TSG and the 6020L here and/or view more analytical instruments for measurements in biogas.
Analytical instrumentation biological desulphurisation of biogas
