Coking of the catalyst in the primary hydrogenation pre-converter? Analysis
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The catalyst in the primary hydrogenation pre-converter became coked after one month of operation; let’s discuss the possible reasons! The plant is for the production of methanol from 150,000 tons of coke oven gas. Process flow: precise desulfurization stage – Filters A/B – Pre-desulfurization tank – Primary hydrogenation pre-converter A/B – .....
It’s possible that oil and water entered the first-stage hydrogenation unit, causing overheating in that stage
Reply to 2# ppz: What temperature do you usually keep?
It is closely related to the operating conditions of the previous process; you are also using evaporative air cooling, right?
For the compression of coke oven gas, evaporation air cooling is used; currently, the air cooler needs to be washed with steam about once a week. There is also a pretreatment system before the gas enters the gas holder
The main reasons for carbon deposition on the surface of pre-hydrogenation catalysts are tar, naphthalene, benzene present in coke oven gas, as well as oil and water from coke presses, which cause carbon deposition at high temperatures around 300 degrees Celsius.