Issues regarding the solution in the desulfurization of semi-water gas
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Our plant uses an alkaline solution absorption method for the desulfurization of semi-water gas, that is, a Na2CO3 solution along with an 888 catalyst. I would like to ask whether, after desulfurization, the rich liquid is regenerated in a regeneration tank using a injector, and the sulfur foam is removed; does the sodium salt remain in the solution? The solution needs to be replenished every day; is all that sodium salt present in the solution? If so, will it affect the desulfurization efficiency of the solution?
Sodium salts are certainly present in the solution, and the solution needs to be replenished daily because some of it is lost along with the gas, as well as due to leaks and other losses. Next, it is necessary to determine what anion is bound to Na+. It is the carbonate ions and bicarbonate ions that absorb hydrogen sulfide; the greater the amount of other types of anions (by-products), the more their presence will affect both the desulfurization efficiency and the regeneration process. If there is an excessive amount of sulfate ions, it will accelerate the corrosion of the equipment.
This post has been up for quite a few days; I wonder if the original poster is still checking it. What the brother upstairs said isn’t entirely correct – does sodium bicarbonate absorb hydrogen sulfide? No. We need to control the ratio of sodium carbonate to sodium bicarbonate in the circulating fluid at 3:1; if the concentration of sodium bicarbonate is too high, it will affect the absorption of hydrogen sulfide, thereby impacting the desulfurization efficiency. Did the sodium salts go with the gas? Under what operating conditions? No. Throughout the entire cycle, sodium salts cannot go away with the gas. It went away with the liquid. Don’t sulfur bubbles come out of the regeneration tank? What is the concentration of sulfur foam? What percentage of sodium salts are present in the solution? (Don’t know? How does your desulfurization system work? ) If your sulfur melting solution is not recycled, then the sodium salts are consumed as a result. Well, you said that my sulfur melting solution was sent back into the system. I just want to ask: so many sodium salts (what sodium salts? Sodium sulfate, sodium thiosulfate, sodium thiocyanate) – these are what we refer to as rich salts in the context of desulfurization. Is your desulfurization process still working properly? Is it queued? Either there is a baking soda recovery device. Didn’t the original poster use the 888 desulfurizer? The people at Dongshi Desulfurization really know their stuff. You can ask them for advice.
The desulfurization conference held by Dongshi Company in Xuzhou in 2008 focused on the topic of sodium bicarbonate’s ability to absorb hydrogen sulfide; previously, the ratio between sodium bicarbonate and sodium carbonate was considered to be 4–5:1 for semi-desulfurization control； Variable shedding control 10–15: 1) has been proven to be incorrect both theoretically and in practice. For example, in the components of the desulfurization solution at our plant, the sodium carbonate level is 1.02 (with a maximum of 2.12), and the sodium bicarbonate level is 40.15 (with a maximum of 54.2). The hydrogen sulfide level entering the plant is generally around 200 mg, while it can always be kept below 6.8 mg on the exit side. In the case of gas carrying liquid, with a large amount of liquid carried along and mist being entrained, isn’t that result in a loss of solution components? This post was last edited by ypff on 2009-3-25 09:04.]