Crystallization phenomenon in the catalytic cracking pre-raising dry gas pipeline
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Our flow rate of the pre-heated dry gas from the 600,000-ton coaxial catalytic cracking unit has been decreasing. We had a meter technician check the flow meters and found no issues; thereafter we removed the control valve and discovered crystals inside it, about the size of mung beans, in a small quantity. Is this phenomenon caused by an excessive sulfur content in the dry gas, leading to the crystallization of elemental S? Is it caused by something else? Let’s discuss this together.
Are there any pictures? It would be best to send a picture for easy confirmation.
It’s very difficult to dissolve this crystal using steam, but it dissolves quickly when water is used:time:
Where is it? I also have 600,000 tons of coaxial type
The poster should post a photo to learn from it
The crystallization of ferrous sulfide in winter is a common phenomenon, especially in media such as dry gas that contain high levels of hydrogen sulfide. When there is some moisture present, hydrogen sulfide corrodes the pipelines, leading to the formation of ferrous sulfide crystals. As the medium flows, ferrous sulfide gradually accumulates, reducing the flow area; over time, this can result in blockages. Since ferrous sulfide is soluble in water, this phenomenon occurs.