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Upgrading process
Process description.
The upgrading plant has to deal with desulphurisation, removal of carbon dioxide and dehumidification. In this paper we introduce two technologies combined in one plant to remove both hydrogensulphide, carbon dioxide and water compounds :
Hydrogensulphide and carbon dioxide removal by water scrubbing. Water of scrubber to be circulated and regenerated in an air stripping unit. Air and water coming out of the air stripping unit to be treated in a biological desulphurisation plant ( Bio Trickling Filter BTF ).
Removal of water, remaining hydrogensulphide and possible other remaining contaminants ( like silicon organic compounds ) by cooling and drying the biogas in the same process.
In order to run the process optimally, CO2, CH4, H2O, H2S and Wobbe-index are measured continuously; the PLC system controls the process according to the analysis’ results.
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