Sulfur tail gas hydrogenation reactor

We have installed a new set of equipment regarding the heating of the tail gas hydrogenation reactor and pre-sulfidation.: 1: How to heat up the tail gas hydrogenation reactor? Which one is better, hydrogen sulfide or tail gas? (You can use hydrogen sulfide or sulfur tail gas, but it is better to use hydrogen sulfide for pre-sulfide.) How to operate? (We also use three-dimensional technology and use circulating fans for pre-vulcanization) 2: At what temperature can it be pre-vulcanized? (250 degrees) 3: What conditions must be met before the tail gas hydrogenation reactor heats up? (First use a circulating fan to circulate, use the incinerator to control the heat exchanger to gradually raise the temperature of the hydrogenation reactor to 250 degrees, and gradually inject hydrogen sulfide to maintain the concentration of hydrogen sulfide at 3-5%.)

Please tell me about the second floor: During pre-sulfidation, the concentration of hydrogen sulfide is controlled at 3-5%. How much will be the bed temperature rise in the hydrogenation reactor? Can the bed temperature be controlled? Catalyst manufacturers tell us that if hydrogen sulfide is used for pre-sulfide, the hydrogen sulfide concentration should be controlled at 1 to 2%. How do you control your hydrogen sulfide concentration to 3 to 5%? We use sulfur tail gas for pre-sulfurization, control the air distribution of the sulfur furnace, and control the H2S/SO2 ratio in the process gas to 4 to 6. At this time, the concentration of hydrogen sulfide in the tail gas is basically around 1%, which just meets the pre-sulfurization conditions. Using sulfur exhaust gas has the following advantages:: 1. Local materials are used, no additional acid gas is required ； 2. Hydrogen sulfide concentration is easy to control ； 3. The operation adjustment is small. After the pre-vulcanization is completed, the H2S/SO2 ratio is directly controlled to 2 and production returns to normal.

During pre-sulfidation, the hydrogen sulfide concentration is controlled at 3-5%, and the temperature rise of the hydrogenation reactor bed is about 40 degrees. However, the control of temperature rise needs to match the concentration of hydrogen sulfide. As the temperature rises, you can lower the concentration. Since there is a certain distance between theory and reality, you should not always follow the manufacturer's opinions. You need to decide based on the actual situation. It is also possible to presulfide the sulfur tail gas. However, you pointed out that once sulfur dioxide enters, sulfur vapor will appear during presulfidation. However, due to insufficient domestic capacity, sulfur accumulation will occur at the rear of the hydrogenation reactor. It's just that the situation is not serious and there are no problems.

I would like to ask whether all the pre-sulfidation process gas enters the hydrogenation reactor and whether an online hydrogen analyzer is used.

If your device has an exhaust gas sulfur dioxide and hydrogen sulfide ratio meter and a hydrogen online analyzer, it is recommended that you use process gas pre-sulfurization. This is the most convenient. The pre-sulfurization process is equivalent to starting the exhaust gas treatment.

How to distribute hydrogen when pre-sulfurizing with process gas. What should I do if the hydrogenation reactor is overtemperature? Should we increase the concentration of H2S (i.e. reduce the air distribution) or reduce the amount of H2 distribution?

How to control the entry of sulfur dioxide when pre-vulcanizing with process gas. SO2 is always present in the process gas

Process gas pre-sulfurization is a pre-sulfurization method that will not overheat.

I think there are several problems if exhaust gas is used during pre-vulcanization! 1. Is it easy to control the ratio of hydrogen sulfide and sulfur dioxide? 2. If sulfur dioxide exists, the temperature of the hydrogenation reactor is easy to rise, and there may be the possibility of sulfur accumulation. 3. If the ratio analyzer fails, it will be very troublesome. 4. If the process gas fluctuates, will it affect the temperature of the hydrogenation reactor? Our unit uses Claus furnace acid gas, and it is easy to control the concentration of sulfur. The temperature rise of the hydrogenation reactor is controlled by the circulation volume of the injector! As long as the temperature rises according to the heating curve, there will be no problem.

What this friend said is really amazing. Pre-sulfurization has certain requirements, such as hydrogen sulfide content and temperature rise requirements. The time is as long as 2-3 days. How can we say that pre-sulfurization is equivalent to turning on exhaust gas treatment? !