One Question per Day, October 9, 2015
Thread Content
What are the advantages and disadvantages of pre-sulfurization of acidic gases compared to pre-sulfurization of exhaust gases?
During exhaust pre-sulfidization, the exhaust gas does not enter the quench tower, resulting in sulfur dioxide emissions that do not meet the standards. Theoretical pre-vulcanization using hydrogen sulfide requires that the flue gas and the Claus process operate simultaneously, so that the emissions can meet the standards from the very beginning. For the first startup of an entire plant or for the restart of the units after a major shutdown for maintenance, where does the acidic gas come from?
What are the advantages and disadvantages of pre-sulfurization of acidic gases compared to pre-sulfurization of exhaust gases? The flow rate and composition of acidic gases change over time, but the composition of the exhaust gases remains relatively stable. Pre-sulfurization of the exhaust gases reduces the temperature requirements at the inlet of the hydrogenation reactor.
The flow rate and composition of acidic gases change over time, but the composition of the exhaust gases remains relatively stable. Pre-sulfurization of the exhaust gases reduces the temperature requirements at the inlet of the hydrogenation reactor.
Answer: The disadvantage of pre-sulfurization of exhaust gases is that the exhaust gases do not enter the quench tower, resulting in sulfur dioxide emissions that do not meet the standards. The advantage of acidic pretreatment is that the flue gas and the Claus process operate simultaneously, allowing the emissions to meet the standards from the very beginning.
What impact will it have if, during pre-vulcanization, the exhaust gases are sent to the quench tower first and then to the absorption tower, following the normal process?
Reduce the project startup time and ensure compliance with exhaust emission standards