If the amount of acidic gas is too low and not addressed, sulfur solidification will occur inside the reactor. How should it be handled?

Perform heat immersion. Increase the amount of gas and air so that the temperature at the reactor inlet is 15–30 degrees higher than normal, thereby vaporizing and removing the sulfur accumulated on the catalyst at a temperature above its dew point; the typical heat-soaking time is 24 hours. For reference only!

How to heat soak? The bed temperature is too low; it is not feasible. I wonder if blowing sulfur directly will cause the bed to catch fire or produce black sulfur?

The air-to-air ratio can be appropriately increased. Maintain production, contact the scheduling team to increase output; if the duration is long, treat it as a temporary shutdown.

Something should be done to increase the inlet temperature of the reactor. If a mixing valve is used, the valve controlling the flow of process gas at the outlet of the waste heat boiler of the acid gas combustion furnace can be closed partially, thereby increasing the pressure in the furnace chamber of the acid gas combustion furnace; this will raise the inlet temperature of the reactor. It is not recommended to use the method of burning gas along with other materials, as this can easily cause the furnace temperature to rise too high. Poor control in this regard may lead to the formation of black sulfur, resulting in more serious problems; moreover, this method actually does not work effectively.

I agree with the opinion above: for small volumes in the short term, the complete combustion method can be used to maintain the temperature, but for small volumes over the long term, shutdown is the only option.

An emergency shutdown also involves shutting off the acidic gases and using gas to blow in sulfur; I wonder if it will be difficult to carry out this sulfur-blowing process, with the control of air supply being the main factor. I’ve never encountered a situation where shutdown was necessary urgently; it’s fine to let the system stay idle for a day or even half a day – just restart it once acidic gas appears again. If anyone has experienced such a situation, please share your advice. Thank you! ! ! ! ! ! ! ! ! !

What is complete combustion? ? ? ? ? ? ?

“We’ve never encountered an emergency shutdown; it’s fine to stop operation for a day, or even half a day – just restart the ignition when acidic gas appears again. Have you really faced such a situation? I have always wondered how long the entire system, especially the first and second reactors, can remain operational without problems after the acidic gas combustion furnace has its supply of acidic gas and air cut off (that is, after feeding resumes and normal operation is restored).

Regardless of the process used, there should be ways to increase the temperature at the reactor inlet. The temperature at the reactor inlet has little to do with the load; in a sense, when the load is low, the temperature can be raised even higher. If it is a blending valve process, check whether the blending valve is functioning properly. Introducing gas can only increase the furnace temperature; it cannot directly raise the reactor inlet temperature

Tell the 9th floor that one day is absolutely no problem, including the furnace and bed temperature. I disagree with the view expressed on floor 10, because I have encountered situations where the system load is too low, resulting in a very slow flow rate of gas. Even if the temperature in the furnace is raised to 1400 degrees, the temperature at the inlet of the converter remains low. Moreover, raising the temperature requires a large amount of air supply, which can easily lead to ignition of the bed material. This means that the device operates at a maximum load, as well as a minimum load; it is difficult to maintain operation at the low load level. If your processing volume is high and the furnace temperature is 1000, with a similarly high inlet temperature, in the case of a smaller volume, the inlet temperature cannot be increased even if the mixing valve is fully open.

As mentioned above, in the case of high levels of acidic gas, it is possible to increase the amount of air supplied in order to burn off most of that acidic gas and maintain the temperature. If the amount of acidic gas is too low, then shutdown measures must be taken! Burning gas alongside other fuels carries certain risks!

What the original poster mentioned about \"too low acid gas volume, resulting in low temperatures in the first and second stages – 280 degrees in the first stage and 170 degrees in the second stage\" only stated that it was low, without specifying how low. When the flow rate of our acidic gas is low, it’s only around 400 m3. At such times, the temperature at the first stage outlet is 280°C, but that of the second stage is also 210°C; it has never dropped below 200°C, let alone 170°C. When the amount of acidic gas is low, it is difficult to control the air supply, which can lead to sulfation; it is also normal for the temperature at the converter outlet to be low. Sulfate reduction treatments can be carried out in such cases

At our minimum air supply level, it’s 100 m3 – you can imagine how much acid gas there is then This will ultimately lead to blockages in the second stage; please remember that the layer height in the second stage must not be lower than 170, otherwise it will be dangerous. Action should be taken early. I just don’t know which is the best approach?

I also have this question: under low load conditions, why is the inlet temperature at the second reactor in the SSR process so low, and how can it be adjusted? During normal production, can the connection line between the inlet of the first counter-current reactor and that of the second counter-current reactor be opened to increase the temperature in the second counter-current reactor? The new facility has not yet started operations, and SSR really has no experience at all.

Under normal conditions, the connection valve between stage 1 and stage 2 should be slightly open, and the inlet temperature of stage 2 is adjusted using this connection valve

Why is the amount of acidic gas low? If the upstream unit is a low-temperature methanol wash, reflux can be applied directly at that unit to increase the concentration of the acidic gases. . .

If the amount of acidic gas is low and the system temperature cannot be maintained, the following actions should be taken: 1. First, check the condition of the upstream equipment; if it can recover within a short time, increase the air supply to maintain the temperature. 2. Recovery cannot be achieved in a short time; it is recommended to reduce the flow rate at the outlet disc valve of the waste heat boiler, and to increase appropriately the amount of hot air flowing through the high-temperature inlet valve. Maintain the temperature. 3. The temperature cannot be maintained, and the device stops operating. 4. If recovery is not achieved within 16 hours, ignite gas to maintain the temperature

Complete combustion means passing all acidic gases through the combustion furnace.

In addition to what the people upstairs have mentioned, the following measures can also be taken: 1. Supply protective steam to the sulfur cooler in order to increase the temperature at its outlet. 2. If possible, burn hydrogen along with the material used in the sulfur production process. 3. Burn the acidic gas along with air after preheating them, thereby raising the temperature of the system. 4. Introduce an appropriate amount of steam or nitrogen into the sulfur production furnace to push the heat backward. 5. Check the insulation condition of the equipment; if the surface temperature of the metal sheets exceeds 50°C, re-insulate them promptly to reduce heat loss.

1. Increasing the temperature of the second stage can prevent sulfur from condensing. 2. Control the heat tracing temperature to prevent condensation in the pipelines