Temperature of the primary reactor in the sulfur recovery unit
Thread Content
This post was last edited by liaifeng on 2018-7-28 at 10:44. The temperature in the bed of my first-stage reactor is around 210 at the upper part, around 230 in the middle, and around 300 at the lower part. I suspect that carbon buildup has occurred in the upper layer of the reactor. Does anyone have any good solutions?
If catalyst carbon deposition is confirmed, there are few options other than removing the catalyst bed
The reasons for low bed temperature include sulfur or carbon deposition; the reactor inlet temperature can be increased appropriately to vaporize the condensed liquid sulfur. In the case of carbon deposition, the catalyst can only be burned out, requiring its replacement.
Increasing the inlet temperature can remove sulfur deposits, as well as promote the reaction between water vapor in the process gas and some of the carbon deposits; if that doesn’t work, it is possible to partially replace the catalysts at the upper section.
This phenomenon is clearly due to a drop in temperature and catalyst deactivation; you can check the catalyst, or after stopping the machine, use nitrogen to raise the temperature and blow on it
It is normal for there to be temperature differences among the upper, middle, and lower layers of a first-order reactor. It is necessary to be cautious when determining whether carbon deposition has occurred; obvious signs of carbon deposition in the layers include an increase in system pressure, which can be analyzed by comparing historical trend charts.
Judging from the temperature, it seems that the catalyst has become inactive. If the reaction is proceeding normally and the exhaust gas conditions are acceptable, check whether the catalyst has reached the end of its service life. If so, increase the inlet temperature and replace the catalyst at an appropriate time.
There is a layer of catalyst inside, right? If the catalytic efficiency is poor, increasing the temperature can help remove the sulfides on the surface of the catalyst. Samples can be taken for analysis to determine whether the carbon content in the process gas is too high. If gum formation and carbon deposition occur on the catalyst surface, it’s generally impossible to address this issue; one can only try to maintain its functionality, and deal with the problem after shutting down the operation
This post was last edited by notemper on 2018-3-21 at 21:51. It’s normal to have a temperature rise; try increasing the mixing temperature. . Here, the temperature difference between the top and bottom is around 80 degrees. . The air supply to the combustion furnace should also be increased a bit.
I believe the levels of thionocarbene and carbon disulfide on your side are too high. The hydrolysis reaction is an endothermic process, and an excess of thionocarbene leads to an increase in sulfur dioxide peroxide at the upstream stage, which in turn results in more hydrogen sulfide being produced through hydrolysis. The excessive heat release that occurs in the catalyst bed layer at the lower part is also a contributing factor. It is recommended to take samples for analysis, and at the same time, enhance the degassing process in the acidic water degassing tank
Check the reactor pressure difference; if it increases significantly, it indicates carbon and sulfur deposition on the catalyst. At this point, consider raising the temperature at the reactor inlet to see if there is any effect; if nothing happens, stop the operation for maintenance and replace the catalyst