Relationship between methane content and wax formation
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Relationship between methane content and wax formation: Is there a relationship between methane content and wax formation, and if so, how significant is it?
In a 600,000-ton methanol plant, the methane content in the fresh gas is 20%, while it is around 50% in the recycled gas. Operating pressure: 7.0 MPa. The wax buildup is so severe that the crude methanol filter has to be cleaned twice a day.
In a 200,000-ton methanol plant, the methane content in the fresh gas is 20%, while it is around 50% in the recycled gas. Operating pressure: 5.0 MPa. Wax buildup is severe; the water cooler needs to be cleaned every 10 days.
In a 500,000-ton methanol plant, the methane content in the fresh gas is 3–5%, while that in the recycled gas is around 40%. Operating pressure: 7.0 MPa. Wax accumulation is severe; the crude methanol filter needs to be cleaned every three days. .
What device has such a high methane content?
In coal-to-methanol plants, the gasifier is a Lurgi furnace manufactured by Saiding Company. The methane content in the gas is high.
Firstly, from the perspective of the mechanism by which paraffin is formed, it must come from syngas, and it seems to have little to do with the methane content in the fresh gas.
It is still related to high methane levels. In units where the methane content in the fresh gas exceeds 50%, wax formation is quite severe.
It should be that a high methane content in the recycled gas indicates less emission of flue gas; with a higher recycling ratio, the H/C ratio of the system should also be lower. That’s why there is more paraffin, right?
The high methane content in the system is not caused by a low amount of released gas. About 20% methane in the fresh gas, about 50% methane in the system; about 5% methane in the fresh gas, about 30% methane in the system