What are the reasons why the iron-molybdenum hydrogenation pre-converter cannot be put into operation due to overheating?
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When our company started up the facility for producing methanol from 200,000 tons of coke oven gas, all the iron-molybdenum hydrogenation catalysts were sulfided. After reactor A for iron-molybdenum hydrogenation pre-conversion was put into use, it operated normally for a year. Now we plan to put reactor B into service, but it overheats no matter how we try to operate it; the oxygen level in the gas analyzed is less than 0.3%. Could anyone among you provide some guidance?
1. Conduct a comprehensive analysis of the sulfur in imports and exports; it’s possible that the vulcanization is not complete； 2. Contact the manufacturer; they should have experience with this and be able to solve it! Personal opinion
Following what was said above, it’s possible that the vulcanization was not complete enough; molybdenum oxide catalyzed the methanation reaction, resulting in overheating. It could also be that poor control of overheating leads to desulfurization and methanation, causing the situation to worsen continuously. It is best to carry out vulcanization at a lower temperature; always keep the temperature from getting too high while driving
It’s likely that the vulcanization was incomplete. At the beginning of operation, the catalyst continued to sulfide, generating significant reaction heat that led to overheating. The inlet temperature can be lowered a bit to control the intensity of the reaction; it’s worth trying this approach, operating at a lower temperature for some time. If that still doesn’t work, vulcanize it again.
Incomplete vulcanization； It is also possible that the inlet temperature is high. Reduce the inlet temperature to see if it can be lowered; otherwise, contact the manufacturer.
If it’s not due to a high inlet temperature or incomplete vulcanization, it’s best to invite the catalyst manufacturer to handle it.
My analysis: 1. The tires were not properly vulcanized when they were first used； 2. The inlet temperature for iron-molybdenum hydrogenation is too high ； 3. Excess unsaturated hydrocarbons in the gas ； 4. Prolonged exposure to air leads to a reduction reaction ； 5. There are many methanation reactions in the catalyst.
When pouring the liquid into the new tank, it wasn’t done thoroughly enough; there wasn’t enough air flow, so the heat couldn’t be carried away. The inlet and outlet of the new tank were left open, and then the old tank was cut out
My analysis: 1. The tires were not properly vulcanized when they were first used； 2. The inlet temperature for iron-molybdenum hydrogenation is too high ； 3. Excess unsaturated hydrocarbons in the gas ； 4. Prolonged exposure to air leads to a reduction reaction ； 5. There are many methanation reactions in the catalyst.