Is a Klaus furnace + hydrogen reduction process necessary?
Thread Content
To ensure that the sulfur content in the flue gas meets the specified standards and to recover as much sulfur as possible, the flue gas containing sulfur dioxide from the Claus furnace undergoes absorption-desorption processes to concentrate sulfur dioxide; this sulfur dioxide is then reduced to hydrogen sulfide through hydrogenation, and the resulting hydrogen sulfide is returned to the Claus furnace for sulfur recovery. In this process, the Claus reaction involves controlled combustion; 1/3 of the hydrogen sulfide is converted into sulfur dioxide, while the remaining 2/3 reacts with unburned hydrogen sulfide to form sulfur. Since the Claus reaction requires sulfur dioxide, isn’t hydroreduction an unnecessary step? Is it possible to produce less sulfur dioxide by controlling the air intake volume of the Claus furnace, and then compensating for it with the sulfur dioxide that has been separated? Please let the experts discuss it.
It’s useless; liquid SO2 can be processed
Sulfur dioxide has a much higher solubility in water than hydrogen sulfide; it is not possible to strip sulfur dioxide from quenched water using stripping methods, whereas hydrogen sulfide can be stripped in this way.
Also, separating SO2 from the exhaust gases is another issue. The issue of amine solution regeneration after SO2 reacts with desulfurization agents such as MDEA, and the problem of SO2 causing the amine solution to deteriorate.
The resistance in the hydrogenation process is quite high; by changing it from hydrogenation, cooling, absorption, and combustion to combustion, cooling, and ion liquid absorption, the system resistance is reduced to 3 KPa. The desorbed SO2 can then be sent directly back to the Claus furnace. First, the exhaust gas from the SCot process does not meet the standards ； Second, the resistance is high ； Third, the MEA has a large cycle volume for hydrogen sulfide absorption, resulting in high steam consumption. Combining the exhaust gas from the secondary Claus process with Claus treatment after incineration is the most reasonable option
One process involves using a solution to absorb SO2 from the exhaust gases, and then the regenerated SO2 is fed into the sulfur production combustion furnace. I don’t know how SO2 is produced during this regeneration process.
The poster still needs to learn more about the sulfur recovery process*; in particular, they need to gain a better understanding of the downstream supporting processes
The renewable desulfurizer circulates to absorb sulfur dioxide; after regeneration, its concentration reaches 99% on a dry basis, and it is then returned to the acid production unit to be used in the production of sulfuric acid, liquid sulfur dioxide, or sulfur.