New sulfur recovery system
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This post was last edited by liaifeng on 2018-9-6 at 19:16. A new sulfur recovery unit is being installed in a coal chemical enterprise; the expected concentration of acidic gas H2S is 30%, with a flow rate of 1300 m3/h； The transformed gas H2S concentration is expected to be 1.5%, at a flow rate of 1200 m3/h, while NH3 concentration is 4% ； Klaus plans to use a pure oxygen process, along with low-temperature hydrogenation and amine liquid circulation for the absorption of exhaust gases. What are the key considerations regarding pure oxygen design and equipment selection, according to the experts here? Without acid gas preheating, can the temperature of the sulfur production furnace meet the requirements for ammonia decomposition? Which method is better for liquid sulfur degassing, and what is the performance of liquid sulfur degassing towers (catalysts)?
When using a pure oxygen process, the corresponding pipelines and equipment must be designed for pure oxygen conditions; therefore, the materials used must be of higher quality. The pure oxygen process can reach very high temperatures, so there is no need to preheat the acidic gases. The liquid sulfur degassing process using catalysts generally does not perform well in China; it is better to adopt Shell’s air degassing process.
The flame temperature in pure oxygen combustion should be high enough to decompose ammonia, and there is no need to preheat the incoming air； However, the valve pipelines need to be designed in accordance with the oxygen pipeline design specifications ； In particular, the selection of burner and furnace material, as well as instrument interlock protection, are even more critical ； As mentioned above, Shell’s air-high-pressure degassing process should work; it’s simple ； Given that the load on your project seems to be low, you could also consider biological desulfurization; qualitatively speaking, it should be less costly. However, you need to conduct a technical-economic analysis to determine it
Thank you! Your suggestions! We will give it positive consideration!
Calculations are needed to determine whether preheating is required; relying solely on empirical judgment is likely not accurate
The two-stage Claus + ionic liquid desulfurization process is the best option: it requires less investment, offers good environmental benefits, and has low operating costs
Oxygen pipelines have high design requirements, with specific design specifications. A patent holder is needed to develop a detailed plan for discussion. The pure oxygen process is theoretically sound, but there are few practical examples of its use; only those willing to take risks would opt for it. Once the installation is built, it’s not easy to make changes if problems arise.
Sulfur emissions need to be considered. . . It’s best to be below 100. . . In the future, environmental regulations will be much stricter.
The sulfur oxide recovery process can be considered: two-stage selective oxidation reactor + low-temperature hydrogenation + amine solution for cyclic absorption of exhaust gases； Or a two-stage selective oxidation reaction + low-temperature incineration reactor + exhaust gas absorption. By choosing the oxidation process, no gas is consumed, and auto-heat can balance it out
May I ask the original poster, has the process been finalized?