Factors affecting sulfur in coke oven gas
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I am a technical manager in the coal chemical industry. Over the past few years, when temperatures rose, the total sulfur content in the gas flowing through the desulfurization units (before the sulfur-ammonia treatment) would increase sharply, leading to an overload on the desulfurization systems and poisoning of the desulfurization fluids. Yet, there was no change in the sulfur content of the coal used in coke ovens, nor in the sulfur content of the coke itself. Numerous attempts were made to identify the cause, but none were successful. Now that temperatures are rising again, we’re faced with this problem once more. I seek advice from experts in the coke industry.
Was it an abnormality in the upstream cold drum circulation system due to rising temperatures, which resulted in incomplete removal of tar and its presence in subsequent processes?
Please, the original poster, explain in detail what the temperature rises to It is estimated to be related to the operation of the ammonium sulfate process. Let’s also talk briefly about the process parameters for ammonium sulfate!
After analysis: the total sulfur content increased significantly after cooling in the drum, while there was no significant change in the amount of thiourea. We had suspected that the problem lay with thiourea, but based on my analysis, it is rather due to an insufficient amount of ammonia circulating in the system and a relatively high temperature in the rising pipe; as a result, the hydrogen sulfide in the gas is not neutralized by the ammonia. Nevertheless, ammonium hydrosulfide remains present until after desulfurization, in the thiourea ammonia evaporation tower. There is not much change before and after sulfur ammonia analysis. So I don’t know the reason right now.
Also, as soon as the sun comes out, they appear right away. It’s obvious.