What changes will occur in temperature and pressure with a slight increase in syngas?
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What changes will occur in temperature and pressure with a slight increase in syngas?
What changes will occur in temperature and pressure with a slight increase in syngas? The temperature of the catalyst layer will decrease, while the pressure in the synthesis system will increase.
A slight increase in syngas leads to relatively lower partial pressures of hydrogen and nitrogen; as a result, the reaction rate decreases, the bed temperature drops, and the system pressure rises. If this increase exceeds a certain limit, it can also have an impact on the catalyst in the synthesis tower
With a slight increase in syngas, the most noticeable change in the temperature of the catalyst layer in the synthesis tower is a rapid drop in the temperature at the hot spots and a rapid rise in the temperature at the bottom. When the temperature shows a cross-shaped pattern, it is necessary to take immediate action to cut off the gas supply, as this is an obvious sign of catalyst poisoning. This occurs because carbon monoxide and carbon dioxide react with hydrogen to form water, and at high temperatures this water turns into steam, thereby causing catalyst poisoning. The synthesis pressure can rise sharply due to the decrease in activity resulting from catalyst poisoning, the drop in temperature, and the reduction in circulation volume; safety must be taken into account! ~
I agree with the opinion from the 4th floor. To be more precise, the level is slightly high; initially, the temperature at the upper layer of the catalyst should drop rapidly while the temperature at the lower layer rises, resulting in a cross-shaped temperature pattern. In addition to the reasons mentioned by the 4th floor, another reason is the poisoning of the catalyst in the upper layer, which causes the reaction to shift downward. After a period of time (which will not be very long), the temperature of the catalyst layer will drop entirely, while the pressure will increase; this is the result of the catalyst being completely poisoned.