Investigation into the reasons for high CO content in the hydrogenation cracking cycle hydrogen
Thread Content
Hello everyone. Our hydrogenation unit uses a process that combines a slurry bed with a fixed bed. Recently, when sampling the circulating hydrogen, it was found that the CO content in it was around 9%, while the methane content was also around 10%. This results in low purity of the hydrogen in the system; increasing the purity of the circulating hydrogen requires the discharge of large amounts of waste gas. What do you think are the reasons for the high CO content in the system?
The purity of the new hydrogen is low, and the carbon monoxide concentration is high
Isn’t it the case that CO is present in the new hydrogen, which causes methanation reactions to occur in the regenerator?
Is the new hydrogen provided by the hydrogen production equipment?
The new hydrogen is provided by the hydrogen production facility, and the concentration of CO + CO2 in this new hydrogen does not exceed 20 PPm
It’s best to measure the hydrogen purity and composition of the new hydrogen
First, rule out the possibility of new hydrogen being introduced. Next, the degree of hydrocracking is too high, causing small molecular hydrocarbons to crack into CO and CH4
1. The CO+CO2 content in the new hydrogen is <20 PPm； 2. Regularly discharge waste hydrogen based on the purity of the recycled hydrogen ； 3. Appropriately reduce the reaction depth ； 4. With energy consumption in mind, the maximum temperature at the high score section should be controlled at the lower limit.
CO originates from fresh hydrogen; it is poorly soluble in both oil and water. Prolonged accumulation leads to a high concentration of it in the circulating hydrogen
It might be a problem with the purity of the new hydrogen; check that first. It could also be that the cracking temperature is too high
1. The CO+CO2 content in the new hydrogen is <20 PPm； 2. Regularly discharge waste hydrogen based on the purity of the recycled hydrogen ； 3. Appropriate cracking temperature to control the reaction depth.