In the shift system, does the heat of reaction of the shift reaction increase when the gas load increases?
Thread Content
In the shift system, when the gas load increases, that is, when the volume of gas rises, with the steam amount remaining constant, does the reaction heat in the shift reactor increase?
The reaction heat will increase; a lower water vapor ratio leads to methanation reactions, which release more heat than the main reaction. This can cause the bed temperature to rise excessively and damage the catalyst. It’s better to adjust it to the appropriate moisture-to-air ratio
It depends on what process is used for vaporization; I don’t think it will increase
For a parabola, at the initial stage of increasing the gas load, the temperature should not exceed the maximum allowable value; this is due to an increase in reaction heat, as more reactions take place. However, as the load continues to increase, the space velocity rises and the residence time decreases, causing a large amount of reaction heat to be removed rapidly, which leads to a drop in the reactor temperature. With the temperature dropping, the reaction rate slows down, and thus the amount of reaction heat generated also decreases.
Both soaring and sinking temperatures can occur. During normal operation, the fluctuation range of the process gas should not be too large, as this can have a significant impact on the catalyst life as well as subsequent processing stages.
The transformation reaction is not an exothermic reaction; doesn’t the temperature drop cause the reaction rate to increase?
A decrease in temperature affects the reaction equilibrium in a way that favors an increase in the extent of the reaction, but the higher the temperature, the faster the reaction rate, whether it is exothermic or endothermic. They are two different concepts.
The transformation reaction is a reversible exothermic reaction; as the temperature drops, the reaction rate certainly decreases. However, as the temperature drops, the equilibrium shifts to the right, increasing the conversion rate of carbon monoxide. Reaction rate and conversion rate are different concepts.
With an increase in load and no increase in steam volume, can the outlet CO level be maintained? The water-vapor ratio is low, resulting in more methane side reactions.