Which desulfurization processes are relatively advanced?
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Which desulfurization processes are relatively advanced?
The desulfurization technology is now fairly mature; the choice of method depends on where desulfurization is to be applied, with the appropriate technique selected based on the specific circumstances.
After two sulfur-resistant shift processes, our sulfur content is very low. Is there a minimum sulfur content range for the catalyst?
The converter used by the poster is a low-temperature converter; controlling the inlet hydrogen sulfide level at over 100 mg is sufficient. Of course, there is a new perspective now: as long as the hydrogen sulfide level at the system outlet is greater than 75 mg, reverse sulfidation will not occur; in other words, it is sufficient for the total sulfur content at the inlet to reach 75 mg. However, many factories have not kept it this low; it’s better to maintain a higher level for safety reasons.
Also, based on what the original poster meant, it’s mainly about changing the method for gas desulfurization. If it is gas desulfurization by transformation, the tannin method is recommended as a more appropriate approach. Personal opinion, for reference only.
For desulfurizing transformed gas, tannin can be used, as well as DDS; both methods are good. After desulfurization, the H2S content should be at least less than 10 PPm; of course, some plants already achieve levels below 5 PPm.
We use the domestic exhaust gas recycling method from Shengyi Company; if anyone is aware of this method, please help! It should be about what the lowest sulfur tolerance is for medium- and low-temperature shift reactions, and how to increase sulfur content
It depends on whether the wet or dry method is used. For the wet method, low-temperature methanol washing is a relatively advanced technique, but it comes with higher operating costs. It is also necessary to consider the requirements regarding the level of desulfurization; the most advanced method isn’t necessarily the best one, so it’s important to act according to one’s capabilities.
The main wet desulfurization methods include the 888 method, PDS method, NDC method, and gum method