Model TLG-837 - Tail Gas Analyzer
From Sulfur Recovery
AAl's solid state, in situ solution for monitoring Claus process efficiency in the Sulfur Recovery Unit. The critical point of innovation is the patented in situ probe, which automatically condenses sulfur vapor out of the sample gas in a controlled manner, thereby neutralizing the problem that cripples most tail gas analyzers.
A critical step in refining crude oil and natural gas is the removal of naturally-occurring H2S. Typically, an amine unit is used to absorb H2S from fossil fuels. The Claus sulfur recovery process is the industry standard for turning the toxic H2S-rich gas from the amine unit (also known as 'sour' gas) into elemental sulfur, which can be repurposed in producing sulfuric acid, fertilizer, gunpowder, and more. In the reaction furnace, H2S is combusted with oxygen:
3H2S + 3/2O2 → SO2 + H2O +2H2S
A catalytic converter reacts these products to create elemental sulfur (in its various crystalline forms):
2H2S + SO2 → 2H2O + 3/XSX
The correct 2:1 stoichiometric ratio of H2S to SO2 is necessary for efficient conversion. As seen in the combustion reaction, maintaining this ratio requires constant adjustment of the oxygen flow. The efficiency of the Claus process thus hinges on accurate, continuous measurement of the concentrations of H2S and SO2. Additionally, the monitoring instrument should be able to detect low concentrations of carbon disulfide (CS2) and carbonyl sulfide (COS), as the presence of these components in the tail gas stream indicates potential problems with the catalyst bed.