If there is no on-line hydrogen analyzer at the outlet of the quench tower, how should I supply hydrogen?
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There is no hydrogen online analyzer in the exhaust gas recovery system; what should we pay attention to during operation?
If too little hydrogen is used, sulfur dioxide or sulfur penetration occurs; the sulfur dioxide or sulfur present in the sulfur production exhaust gases is not completely converted and ends up entering the subsequent systems, resulting in a higher pH value in the quench water system, a decrease in sulfur recovery rates, and non-compliance with environmental standards. Excessive hydrogen can lead to overheating of the exhaust gas treatment furnace and waste of hydrogen when the purified exhaust gases enter this furnace. Under normal circumstances, it is sufficient to ensure proper air distribution in the sulfur production section, maintain a stable and appropriate temperature rise in the hydrogenation reactor bed, keep the pH value of the quench water stable, and avoid significant fluctuations in the exhaust gas furnace.
With stable production, keep the tail furnace gas and air unchanged. Then turn on the hydrogen supply until the temperature of the tail furnace starts to rise; this indicates that there is an excess of hydrogen. As for the amount of excess, you can determine it by conducting analytical tests and comparing it with the temperature increase in the tail furnace, and once you identify a pattern, it will be easier to manage the situation
A hydrogen-free external analyzer can be used by 1) increasing the frequency of exhaust gas testing to determine whether there is an excess of hydrogen. 2. Adjust the air volume based on the temperature rise in the hydrogenation reactor: reduce the air volume if the temperature rise is large, and increase it if the temperature rise is small. 3. Increase the frequency of testing the quench water; when a high acidity level is detected in the pH value, adjust the air supply volume promptly.
If there is no hydrogen analyzer, it is necessary first to ensure good air distribution in the sulfur production section. The excess sulfur dioxide generated in this way will not be significant; it is possible to have the hydrogen content analyzed, with it remaining basically stable within the range of 4%-6%. In this way, the approximate hydrogen content can be determined. For minor fluctuations, it is sufficient to pay attention to the temperature rise in the hydrogenation reactor, as well as the temperature rise in the incinerator or the oxygen content in the flue gases – these are all relatively quick ways to obtain such information. As for the pH response in the quench tower, it is particularly laggy. It is generally not used as a reference object first. Active participation