Presulfurization of sulfur recovery hydrogenation reactor
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Dear teachers, for the 3D technology used in our facility, pre-vulcanization is carried out by introducing acidic gas into the facility to effect premature vulcanization (this pre-vulcanization process takes place when the sulfur production unit is not yet in operation). I’m not quite sure how to switch to the sulfur production phase after pre-sulfurization is complete, as in the past it was all handled together by adjusting the sulfur ratio to 4-6. My question is: after pre-sulfurization is finished, should we continue to circulate fluid to maintain the reactor temperature and wait for the transition to the sulfur production phase, or should we stop the circulation to maintain temperature and pressure before making the switch?
Continue the cycle to maintain the system temperature; there is no need to inject hydrogen sulfide.
After pre-fluidization is completed, maintain the temperature and pressure, wait for the acid gas to be introduced, and then activate the entire process!
Either of the two options is acceptable, as long as it is ensured that air does not enter the system and the system temperature is maintained.
Is that section for sulfur production cut off to keep the sulfur ratio around 2? It’s not 2, and it won’t have an impact on the hydrogenation reactor. There’s another issue: during sulfidization, when the unit just starts operating, the concentration of hydrogen sulfide keeps changing. How can we determine when sulfidization is complete? I hope the teacher can provide an answer
1. The purpose of pre-sulfurization with acidic gas is to enable the simultaneous operation of the Claus process and the exhaust gas treatment system, so that the SO2 emissions can meet the specified standards as soon as operations begin. 2. It is difficult for Klaus to achieve an absolute ratio of 2:1; a fluctuation of hydrogen sulfide at 1.75% and sulfur dioxide at 0.6% represents a relatively normal level of control, and this is the level observed in many companies. 3. Our requirements for operations are as follows: firstly, SO2 levels should be no more than 0.5%; as a second line of defense, they should not exceed 0.8%; and as a third line of defense, they should not be higher than 1.0%.
The person upstairs explained it quite clearly. I have a few questions: 1. What is the relationship between determining when presulfurization is complete and whether there are fluctuations in acidic gases? Even if there are fluctuations, samples are taken at both the inlet and outlet of the hydrogenation reactor for analysis simultaneously; so why would this affect the determination of whether pre-sulfiding is complete? 2. Why pre-vulcanize in advance? What are the disadvantages of pre-vulcanizing exhaust gases? 3. After the pre-vulcanization is completed, should sulfur production be combined with the exhaust gases? If the ratio is not 2, should they not be combined? Is that sulfur-producing exhaust gas directly discharged into the atmosphere via the incinerator? The procedures for driving should be thoroughly explained before driving; Li Tiejun or Fan Zhigang will definitely explain them to you. Be careful while driving behind, OP.
This post was last edited by Meng Tan Jian ④ Rim grass on 2015-6-19 00:50. Here’s the thing: 1. A high hydrogen sulfide concentration can affect the temperature required for vulcanization. If the concentration of hydrogen sulfide suddenly increases while vulcanization is in progress, it will certainly have an impact on the temperature. Isn’t the end of vulcanization indicated by the fact that the temperature stops changing? Fluctuations in temperature make it difficult to take samples as well, right? Pre-vulcanization is done in order to get things up and running as quickly as possible; after all, pre-vulcanization also consumes a lot of time. 3. That’s what I think: if your sulfur ratio isn’t adjusted to around 2, and assuming the level of sulfur dioxide is high, then the heat generated during the reaction in the hydrogenation reactor should be much higher than normal. Could this lead to overheating? These are all my assumptions; I have no practical experience, so I hope the expert can give me some guidance
http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=611574&highlight=%D4%A4%C1%F2%BB%AF Let’s take a look at how this is expressed. My personal opinion: Pre-sulfurization of exhaust gases is easier to operate than that of acidic gases. First, as you said, the flow rate and composition of acidic gases are constantly changing, but obviously the composition of the exhaust gases is more stable ； Secondly, pre-sulfurization of exhaust gases requires a lower inlet temperature for the hydrogenation reactor.
Hello, Brother Yu. I have a question: 1. Which three lines of defense are referred to as the three lines of defense? Is the first line of defense the sulfur production exhaust gas that is controlled during sulfur production, the second line of defense the purified exhaust gas coming out of the absorption tower, and the third line of defense the exhaust gas emitted through the chimney? 2. Will pre-sulfidation of acidic gases before operation cause the exhaust emissions to exceed limits?
Thank you. It’s mainly the management who made this arrangement – to use low-methanic acid gas at the hydrogenation inlet for pre-sulfidization – and we have to follow that instruction. However, we don’t have any information on this topic, so we’re reaching out to see if there is any relevant data or precedents available that we can use as a reference. Also, work will start soon. Thank you for the reminder, and I wish you success and happiness in your work