The CO content in medium-temperature gas is high!
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For hydrogen production from dry gas, the temperature of the medium-pressure shift bed is around 390 degrees. Recently, the CO content in the medium-pressure shift gas has been high, so the management has ordered an increase in the temperature of this shift reaction. Isn’t this a reversible exothermic reaction? Wouldn’t increasing the temperature help reduce CO levels? ? ? How should it be done?
It mainly aims to increase the activity of the catalyst in the reactor, thereby speeding up the reaction rate. From the perspective of chemical reaction equilibrium, raising the temperature is not favorable for this equilibrium; overall, however, it facilitates the progress of the reaction. .
Appropriately increasing the bed temperature is beneficial for the reaction; it generally should not exceed 400℃
Raising the temperature also works, or increasing the water-to-carbon ratio can also reduce the amount of CO
What is the current level of carbon monoxide? How many years has the catalyst been in use?
If the catalyst is used for a long time, it is recommended to replace it； If the catalyst has not been in use for long, appropriately increasing the intermediate-pressure inlet temperature and the vapor-to-gas ratio will yield better results
It is not a problem for medium-temperature shift catalysts to operate normally for over ten years; check the process-related reasons
It is not a problem for medium-temperature shift catalysts to operate normally for over ten years; check the process-related reasons
First, check the control parameters: 1. Has the composition after conversion changed? 2. Has the water-to-vapor ratio after conversion changed? Raising the operating temperature of the medium-shift converter can increase the catalyst’s activity; however, 390 should already meet the activity requirements for such catalysts. It is necessary to identify the underlying cause before considering raising the temperature further.
390 degrees is high enough; above 400, methanation reactions occur. Is it due to insufficient steam supply or poor catalyst activity?