Sulfur recovery unit operator
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Today, while reading the book on sulfur recovery unit operators, there is a sentence in the middle of page 10 that says: \"The hydrogen sulfide content in the acidic gas produced by solvent regeneration is lower than that in the acidic gas generated by acid water stripping.\" Is this statement correct? Shouldn’t the hydrogen sulfide content in the acidic gas produced by regeneration be higher instead? :(
Is the solvent you use MDEA? If so, the concentration of hydrogen sulfide after purification will be higher than before concentration! Check if there are any other constraints!
For most refineries, the hydrogen sulfide content in the acidic gas produced by solvent regeneration is lower than that in the acidic gas generated by acidic water stripping. 1. Carbon dioxide is present in dry gases from processes such as catalytic cracking; the low concentration of hydrogen sulfide in the regenerated acidic gas is mainly influenced by the carbon dioxide content. 2. The acidic gases from wastewater with high concentrations are those generated by ammonia extraction via side lines or in a double-tower process. The atmospheric stripping process is not included; in this process, due to the high content of ammonia and water in the acidic gas, the hydrogen sulfide concentration is lower than that of the regenerated acidic gas.
Our main unit is a hydrogenation system. According to our process design, the hydrogen sulfide content in the acidic gas produced is over 90%, while in the acidic gas generated by stripping, the hydrogen sulfide content is less than 40%; ammonia accounts for nearly 40%, and the remaining portion is water
1. Your situation is normal. 1. The regenerated acidic gas from the hydrogenation unit contains essentially no carbon dioxide. 2. For your acidic wastewater gas, low-pressure stripping is used to extract ammonia and hydrogen sulfide from the top of the tower; especially since the temperature of this acidic gas is relatively high, the amount of water vapor present is also high. However, this acidic gas must not be cooled too much, otherwise ammonium salts will crystallize. II. The book titled “Operator of Sulfur Recovery Unit” that you are seeing was compiled quite some time ago; in fact, hydrogenation and atmospheric stripping are processes that were introduced and gradually adopted later on. Furthermore, such materials are often compiled by a particular company, which inevitably leads to many limitations in terms of perspective.
It mainly depends on the sulfur content in the rich liquid and that in the acidic water; it’s not necessarily the case that one has a higher level
It varies depending on the specific conditions of each device
A portion of the acidic gas produced is carbon dioxide