Retrofit of the tail gas hydrogenation section in the sulfur recovery unit
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I would like to ask whether any modifications have been made to the hydrogenation section of the sulfur recovery unit – specifically, whether the on-line heater has been replaced with a steam heater, and whether the method of heating the feed gas has been altered to enable operation at low temperatures, thereby reducing the deactivation of the catalysts used for exhaust gas hydrogenation caused by fluctuations in the operation of the on-line heater.
Hydrogen injection in the Klaus furnace? Still Scott exhaust hydrogenation?
SCOT exhaust hydrogenation
Why does exhaust gas hydrogenation become deactivated? It is simply due to the two states of sulfide and oxide. When the oxygen content in the exhaust gas is high, the temperature rise in the hydrogenation catalyst is significant. If the pH of the water in the quench tower is low, it indicates that the hydrogenation reactor is not functioning properly; sulfur dioxide dissolves in water within the quench tower to form sulfurous acid. If burning clean acidic gases, adjust the exhaust ratio meter to 4-6 to 1, until the pH of the quench water in the quench tower reaches above 6. Just re-presulfurize it. As for low-temperature operations? Low-temperature operation of the Claus furnace?
It should be referring to Scott’s low-temperature hydrogenation catalyst
The cause of deactivation is likely an improper ratio of fuel gas to air in the online heater; changes in the composition of the fuel gas result in either excessive or insufficient airflow, leading to catalyst coking and deactivation