Using the 888 wet desulfurization solution, the sodium carbonate disappeared and the total alkalinity dropped from more than 30 to about 10, with a pH of 7, but the desulfurization efficiency was normal.
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My synthetic ammonia plant uses the 888 wet desulfurization method and adds 1.5 tons of alkali per day. However, a recent analysis of the components in the solution found that the sodium carbonate is gone, the sodium bicarbonate is about 10g/L, the total alkalinity has dropped from more than 30 to about 10, the pH is 7, the by-product sodium sulfate is too much, and the sodium thiocyanide is too much. The rest is normal, but the hydrogen sulfide content has not changed, and the desulfurization efficiency is also normal. It is the same as before. I don’t know why, please help! Thanks!
Can you tell us about the gas volume, liquid volume, import and export of hydrogen sulfide?
Reply 2#jinpingwang_69 The gas volume is about 60,000 m3/h, the imported H2S: about 0.8 g/m3, and the exported H2S: about 0.03g/m3. The liquid level in the rich liquid tank is about 280m3, and the liquid level in the lean liquid tank is about 50m3. Thanks!
First, you need to determine whether the amount of HCN in the gas has changed. If there is no change, it is recommended to try adjusting as follows.: 1. First control the circulation volume of the desulfurization liquid at about 1,200 cubic meters/hour and run it for a period of time (I don’t know how much the original liquid volume is). 2. Measure the air suction volume of the regeneration ejector. It must be more than 5 times the liquid volume of the ejector.
Reply 4#jinpingwang_69 Thank you very much!