Selection of the Claus sulfur recovery method
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This post was last edited by adsl121 on 2010-7-10 23:05. Under what circumstances should the direct current method (partial combustion method) be used? When should the shunting method be used? When should the direct oxidation method be used? Dear sea friends, please share your insightful opinions!
This post was last edited by adsl121 on 2010-7-10 23:05. In some books I read before, it was mentioned that a DC level of over 50% leads to shunt current in the range of 15–50%, while a DC level below 15% results in direct oxidation. However, given the rapid evolution of the Claus process, I’m very interested in knowing what the current minimum thresholds for these processes are. I hope everyone will share their opinions to keep this post active. Participate actively.
This post was last edited and replied to by adsl121 on 2010-7-10 23:05. Reply to 2# 47179117: “15~50% diversion” – do you think that for acidic gases with a hydrogen sulfide content of 35% (as an example), diversion is the only option available? What is the basis for choosing shunting? These days, many processes with a hydrogen sulfide content of only 20% opt for the direct current method (partial oxidation), using oxygen-enriched or pure oxygen as the oxidant.
This post was last edited by adsl121 on 2010-7-10 23:06. The range specified in the literature is 50–15; I think the reason is that if the concentration is too low, not enough heat is generated to maintain the flame inside the furnace. It’s also possible to use fuel gas to assist combustion when the concentration is below 50. I have simulated that when the proportion is around 20%, the side reactions of the communication fuel gas become quite severe; in such cases, the shunting method has to be used
This post was last edited by adsl121 on 2010-7-10 23:06. Reply to 3# 654262293: Oxygen enrichment is also an option, but you need a source of oxygen first
This post was last edited by adsl121 on 2010-7-10 at 23:06. Reply to 4# Tongxin Zhiyu: With a hydrogen sulfide concentration of 25% in the acidic gas, using pure oxygen as an oxidant, it should be fine to maintain a temperature of 1250 degrees in the combustion furnace for such gases. Therefore, the hydrogen sulfide concentration is not the determining factor; what’s important is whether the temperature in the combustion furnace can be kept above 930 degrees. If an appropriate oxidant is used, even if the hydrogen sulfide concentration is lower, it’s better to opt for the partial combustion method. Since the partial combustion method can burn off ammonia and hydrocarbons in the feed gas, it is reasonable and beneficial for the entire sulfur recovery system.