|Analysis Point||Analyte||Typ. Range||Suitable Analyzer|
|Tail Gas from Claus Process||H2S (hydrogen sulfide)||0-4,000 PPMV||OMA-300 Process Analyzer|
The purpose of a tail gas treatment unit (TGTU) is to maximize the conversion of sulfur compounds to H2S. With an efficiently run TGTU, sulfur recovery efficiency can be increased up to 99.99%.
A Sulfur Recovery Unit (SRU) is responsible for converting most of the sulfur-containing compounds into elemental sulfur, but after the SRU up to 5% of sulfur-containing compounds may remain. The stream that leaves the SRU is known as “tail gas”, and is the feed stream for the TGTU. The sulfur compounds that are still contained within the tail gas are converted by the TGTU into H2S using a catalytic hydrogenation reduction stage and an amine absorber. The treated gas is then directed to an incinerator, and the rich amine may be directed back to the SRU.
The purpose of making the H2S & H2 measurement is to validate the reduction reaction. In addition, the H2S measurement is also used to identify the sulfur load heading to the amine absorber. The OMA-300 Process Analyzer continuously outputs both H2S and H2 readings, providing new measurements approximately every 5 seconds.
In the diagram below, the tail gas treatment units analysis point is identified by AT8.
H2S and H2 are measured at AT8 in the stream leaving the TGTU, before being sent to the amine absorber.
|OMA-300 H2S Analyzer||Brochure|
|OMA-300 Process Analyzer||Data sheet|
|TLG-837 Tail Gas Analyzer||Brochure|
|Measuring H2S/H2 in a Tail Gas Treatment Units (TGTU)||Application Note|