Desulfurization of refinery gas and natural gas
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Let’s talk about the differences between desulfurization of refinery gas and desulfurization of natural gas. Generally, after MDEA desulfurization of refinery gas, the H2S content is around 20PPM, while that in natural gas is very low, less than 1PPM. How is this achieved? Are there any other advanced desulfurization devices available?
This post was last edited by ylb913 on 2015-10-27 at 11:36. Although the specification for desulfurization of refinery gas is no more than 20 mg/m3, the actual values at the distillation outlet are well below the detection limit of 1 ppm. Additionally, the pressure for natural gas desulfurization is high, so the desulfurization effect is naturally better.
For normal desulfurization of refinery gas, DEA is used, achieving a level of around 20 PPm; whereas advanced desulfurization involves the use of desulfurizing agents such as zinc oxide, which reduces the sulfur content to below 0.2 PPm
You’re so low; we used to have a target of 50, and we often exceeded it.
What I’ve seen in use is MDEA; zinc oxide is generally used in small amounts for desulfurization, and it belongs to the category of post-treatment methods. I’ve never seen natural gas desulfurization; I don’t know if zinc oxide desulfurization is an alternative option for them
What is the use of natural gas after desulfurization? We produce hydrogen by desulfurizing it with a desulfurizer before it enters the conversion process
The coking dry gas is of poorer quality; similarly, the amine-rich liquid (for centralized amine regeneration) has been in use for over two and a half years, and its concentration reached levels between 300 and 500 ppm this year. The tower in question is dirty, and we have just replaced it with a desulfurization tower (installed last year). The outlet concentration is generally around 4, 6, 8, or 10 ppm, with the highest value reaching 20 ppm. For catalytic dry gas and liquefied gas, our levels are all below 1 ppm.
Natural gas is desulfurized and deacidified, then pressurized before being delivered to consumers; substances such as H2S are recovered using sulfur recovery units. In fact, the process flows for natural gas treatment and desulfurization of gas in refineries are similar. Desulfurization, acidic water stripping, sulfur recovery, and more! The PSA unit in the later stage of hydrogen production has specific requirements regarding the sulfur content in hydrogen; thorough removal of sulfur is necessary, as too high a sulfur content can affect the activity of the adsorbent.
For wet flue gas desulfurization in China, the domestically developed LO-CAT process can be used; it operates on a bubble absorption principle, and absorption to levels below 1 ppm can be achieved in just one step. This process is relatively simple and requires little investment, making it suitable for direct treatment at natural gas wellheads.