Regarding the issue of when to put the H2S/SO2 ratio analyzer into use for sulfur recovery operations that have just started
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Dear sea friends, I came across the following passage in some literature: According to conventional startup methods, during the initial stage of feeding materials, the acidic gases are burned using a slightly excess air ratio to ensure that H2S is completely burned into SO2. Therefore, to prevent clogging of the H2S/SO2 ratio analyzer due to excessively high SO2 levels at the beginning of operation, the ratio analyzer is generally not used within a few hours after acidic gas is introduced. I would like to ask why a high SO2 level at the beginning of operation can cause clogging in the sulfur ratio analyzer When is the best time to put the sulfur ratio analyzer into use?
This post was last edited by ylb913 on 2015-11-12 at 10:35. I’ve never heard of any claim that a large amount of air needs to be used at the beginning of operation in order to produce more SO2. As long as the H2S/SO2 ratio meter is functional, it should be put into use as soon as operations begin. The reason for using high air supply levels at the beginning of operation is that the load on the equipment is very low at that stage, making it difficult to control the air supply; moreover, the system lacks sufficient heat. This high air supply level has to be maintained for about a week, and at such times, it doesn’t really matter whether online sensors are used or not.
We put it into use before starting up the process to introduce acidic gas; this way, when acidic gas is introduced, it’s possible to determine the amount of air supply right away! There have been no blockages either; isn’t the ratio analyzer equipped with a jacket? How can it get blocked again? Even if it gets blocked, isn’t there regular backflushing?
It’s the materials related to the 12th Sulfur Recovery Conference in 2015 that were uploaded a few days ago; among them there is a paper titled \"Research and Practice on Ensuring That SO2 Emissions from Flue Gas Remain Within Limits from the Start Up of a New Sulfur Recovery Unit.\" I have excerpted a passage from it, which discusses the commissioning of Sinopec’s Guangxi branch’s sulfur recovery unit with a capacity of 260,000 t/h.
Yes, I just don’t understand the meaning of that passage in the document titled \"Research and Practice on Ensuring That SO2 Emissions from Flue Gas Remain Within Limits during the Initial Operation of a New Sulfur Recovery Unit\", so I’d like to discuss it with all of you here. Note: This document comes from the materials of the 12th Sulfur Recovery Conference in 2015, which were uploaded to the sulfur section a few days ago.
The sulfur ratio meter should use ultraviolet light; high levels of H2S or SO2 will have no impact, nor will they clog the sampling port. At the beginning of operation, the system was dirty, covered with dust, and had linings as well as catalyst powder ； The composition of the acidic gas volume is unstable, and there is a high likelihood of carbon deposition when air is supplied in accordance with theoretical amounts; in such cases, the sampling port tends to get clogged. Therefore, it is understandable to refrain from feeding material during the first few hours. Of course, I’ll start pumping as soon as work begins; if there’s a blockage, I’ll deal with it. It’s not certain that there will be a blockage, provided that thorough purging is done before starting work. Therefore, it is also understandable to use a higher air supply volume in order to reduce the risk of carbon deposition.
I’ve never heard of it; we always apply it properly before introducing acidic gas
As long as the protective measures for the relevant instruments are in place, the ratio system can be put into use upon startup.
Generally not; when it gets blocked, steam is used to clear it. This watch is a bit troublesome to use at the start of operation, but once it stabilizes, there are usually no issues. Not maintained for half a year