Urgent! Urgent! Urgent! Issues regarding the handling of sulfur exhaust gases.

The ratio of 1.8 you mentioned has no basis and is not credible. The temperature at the reactor inlet is 235 degrees, while the reactor temperature is 330–340 degrees; if these are all temperatures of a hydrogenation reactor, then they are too high. The normal temperature rise in the hydrogenation reactor is just over 30 degrees; when the hydrogen sulfide level at the reactor inlet is high, the temperature rise is lower. The hydrogen sulfide content in the normal secondary outlet should be around 0.6–0.8 (assuming a total sulfur level of 0.9–1.2).

The air distribution ratio is obtained by dividing the normal air supply volume by the amount of acidic gas! There’s a contradictory issue here: if I reduce the air supply, the hydrogen sulfide level at the reactor inlet will definitely increase. But the load on the rear tail tower is high (amine concentration of 30, circulation rate of 30 tons/h), and the temperature in the tail furnace will also rise above 800 degrees! In my experience, excessive acid gas levels are a problem; moreover, large fluctuations in acid gas levels make things unstable, and the lack of a ratio meter makes it even harder to control the situation! Excuse me, teacher, are there any other ways to do this?

Teacher, may I ask if operating the exhaust gas treatment system will result in a decrease in sulfur production?

It is detected that the hydrogen sulfide level at the inlet of the hydrogenation reactor is lower than that at the outlet; the hydrogen concentrations at both the inlet and outlet cannot be measured. What other parameters can be used as a reference? Please give me some advice, teacher!

It is detected that the hydrogen sulfide level at the inlet of the hydrogenation reactor is lower than that at the outlet; the hydrogen concentrations at both the inlet and outlet cannot be measured. What other parameters can be used as a reference? Please give me some advice, teacher!

1. When exhaust gases are released, sulfur production increases. Theoretically, it should increase by nearly 10%. 2. You didn’t mention what the temperature rise of the hydrogenation reactor is? Without online instruments, we adjust the air supply based on the temperature rise in the hydrogenation reactor; in this case, the temperature rise can be kept at a somewhat higher level, such as 30–50 or 40–60 degrees. 3. The hydrogen sulfide level at the outlet of the secondary reactor is normally around 0.7%; it is normal for this value to fluctuate up to 1.2%, with the maximum generally remaining below 1.5%. 4. The normal hydrogen sulfide content at the inlet of the absorption tower is around 2.1%. You can check the PFD in your design drawings for these concentration parameters. 5. Currently, for most “replies” within HaiChuan, the recipient does not receive any notification, and thus is unable to reply in a timely manner; please understand this.

The temperature rise in the hydrogenation converter is too high; reduce the air supply as well as the amount of hydrogen gas, and pay attention to fluctuations in the sulfur dioxide levels in the exhaust gases. The cooling air flow has been reduced; the high temperature in the tail furnace may be due to an excessive amount of hydrogen.

The last edit to this post was made by Waltz’s Melody on 2015-7-10 at 17:29. 1. I would like to ask the teacher: I calculated the hydrogen ratio as follows: (amount of acidic gas + amount of air supplied) * 3%~5%. Is that correct? 2. The temperature rise in my reactor is as follows: at some temperature measurement points after the mixer, the temperature reaches 235 degrees, which corresponds to the inlet temperature of the reactor. There are six temperature readings inside the reactor, with 3 readings per group representing the upper, middle, and lower sections; however, according to the temperature readings, these three values are all similar, ranging between 300 and 340 degrees. We suspect that one of the measured temperatures actually represents the temperature in the upper-middle part of the reactor. Over the past few days since operation started, following the second guideline, we have managed to keep the difference between the inlet temperature and the reactor’s internal temperature within 40 degrees. However, the temperature in the exhaust furnace exceeds 800 degrees, with the hydrogen flow rate being between 160 and 200 m/h. Once the acidic gas becomes unstable, the reactor temperature cannot be controlled. I seek the teacher’s guidance!

1. I would like to ask the teacher about the ratio for hydrogen. I calculated it as follows: (amount of acidic gas + amount of air supplied) * 3%~5%. Is that correct? 2. The temperature rise in my reactor is as follows: at some temperature measurement points after the mixer, the temperature reaches 235 degrees, which corresponds to the inlet temperature of the reactor. There are six temperature readings inside the reactor, with 3 readings per group representing the upper, middle, and lower sections; however, according to the temperature readings, these three values are all similar, ranging between 300 and 340 degrees. We suspect that one of the measured temperatures actually represents the temperature in the upper-middle part of the reactor. Over the past few days since operation started, following the second guideline, we have managed to keep the difference between the inlet temperature and the reactor’s internal temperature within 40 degrees. However, the temperature in the exhaust furnace exceeds 800 degrees, with the hydrogen flow rate being between 160 and 200 m/h. Once the acidic gas becomes unstable, the reactor temperature cannot be controlled. I seek the teacher’s guidance!

There are basically no problems. Under normal air distribution, the exhaust gas itself may contain nearly 1% hydrogen. It’s best to have laboratory analysis data.