Impact of acidic gas air distribution and tail furnace
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It has been a month since operations started, and because the ratio analyzer is broken, it has not been possible to determine the correct air supply amount. My flow rate of acidic gas is around 1200, while my air supply amount is over 1500; therefore, the air-to-gas ratio is approximately 1:1.3. No fuel gas is being burned. However, before conducting tests, no SO2 could be detected in the samples taken from the collector. Now, the tests show that the ratio of H2S to SO2 in the gas is 0.2. When I thought it was necessary to reduce the air supply, the temperature in the tail furnace (with a fuel gas flow rate of 150 Nm3/h and an air supply of around 3600 Nm3/h) increased sharply, rising from 750 to 842. Is there a problem with my air supply from the beginning, or are the test results inaccurate? When I adjust the air supply to the sulfur production furnace, how should I adjust my tail furnace? Please let me know, sir! ! :'(
It’s definitely not right; the data from the tests also doesn’t seem accurate
In our normal operations, the ratio of air to acidic gases is around 2 to 1. The instrument used to measure the ratio of hydrogen sulfide to sulfur dioxide has been broken for a long time, so we no longer check that ratio; it’s also normally 2 to 1
Just a reminder: when you reduce the power level, have you noticed that your hydrogen consumption also increases?
Is your usual practice to keep it at a 2:1 ratio? Is it that tall? I just checked the data – here, for 5000 units of sour gas, the normal air supply is 6500 units, which results in a value of around 1.3. A slightly higher value is normal, but why is it so high for you? It should be the ratio of the gauge, I guess.....
1. Check the temperature of the hydrogenation reactor bed; if it is higher than the normal value, it indicates that the air supply is too high. In such cases, the air supply can be reduced, but not by a large amount, as a significant reduction would suggest a high sulfur ratio and an increase in side reactions (such as CS2 and COS). This would result in a lower temperature in the hydrogenation reactor, incomplete hydrolysis, and ultimately a higher temperature in the tail furnace.
The ratio you mentioned between the air supply and acidic gases should be related to the H2S concentration in the feed; a higher H2S concentration results in a higher value for this ratio； The H2S concentration is over 90%, and the ratio reaches 2 or higher. When the air-to-fuel ratio is reduced, the temperature of the incinerator rises; at this point, the fuel supply to the incinerator should be decreased. Is the increase in temperature caused by a decrease in the flow rate into the incinerator?
Both theories give a ratio of 2:1; of course, the ratio also depends on the concentration of acidic gases. In our daily operations, we monitor two parameters: the temperature change in the hydrogenation reactor and the pressure during solvent regeneration. The sulfur produced during solvent regeneration is used internally； The ratio meter has been broken for a long time; there’s no need to check it
We don’t know what’s going on with the hydrogenation reactor in our unit; its temperature used to be around 280, but now it has dropped to around 210