Problems with the sodium-calcium double-alkali desulfurization method? ? ? ? ? ? ?
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This workshop originally used the sodium-calcium double-alkali method to remove sulfides from flue gas; however, due to process-related issues, it was changed to a single-alkali desulfurization method, in which only sodium hydroxide is used as the absorbent. During this process, red crystals appeared in the sedimentation tank and reaction tank. Testing these red samples with acid revealed the presence of hydrogen sulfide, leading to the suspicion that the red crystals might be sodium sulfide. I am quite confused by this issue – how could sodium sulfide be generated during this process? I need help, urgently! ! Thank you
It is possible that the flue gas contains a small amount of elemental sulfur, which means that the dust removal efficiency of the flue gas is poor. When elemental sulfur reacts with sodium hydroxide, sodium sulfide is formed!
Over the past few years, as I have been working on desulfurization in power plants and have often engaged in discussions on this topic with others, I have encountered a strange phenomenon: everyone who claims that the sodium-calcium double-alkali method is good has never actually used it! None of those who have used the sodium-calcium double-alkali method have given a positive review! Why is this? Have you ever been completely puzzled by it? Could you please clarify this?
This is a problem with your workshop’s manufacturing process; it has nothing to do with the double-alkali method. You should investigate what products are formed and what reactions take place during your process. When SO2 and SO3 react with alkalis, H2S and NaS definitely do not form
Some units around me are also implementing double-alkali desulfurization, and it doesn’t seem certain that it will work well. I can only check it after I start driving