What is the purpose of installing synthetic catalysts in segments?
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What is the purpose of installing synthetic catalysts in segments? Everyone is welcome to join the discussion!
It is necessary to consider adjusting the temperature of the bed layer, in order to achieve uniform temperature throughout the bed layer, stabilize the synthesis reaction, and protect the catalyst.
While setting up the stratification, heat exchangers are generally also installed to regulate the temperature, so as to bring the reaction temperature closer to the optimal curve for the reaction and increase the ammonia yield.
While setting up the stratification, heat exchangers are generally also installed to regulate the temperature, so as to bring the reaction temperature closer to the optimal curve for the reaction and increase the ammonia yield.
I think: 1: To reduce the degree of backmixing, vertical segmentation is employed (backmixing alters the concentration distribution within the reactor, resulting in a decrease in reactant concentration); 2: To reduce pressure drop； 3: Stable operation keeps the catalyst bed temperature within the controlled range ； The above are my personal opinions; I have just started working in the chemical industry, so I hope fellow experts can offer me lots of guidance
Due to the relatively high height-to-diameter ratio of the synthesis tower, a large amount of catalyst is required and it is placed at a significant height; based on heat balance calculations, the use of quench gas facilitates better control over the reaction taking place in the catalyst bed as well as heat management
Between the catalyst layers, the reaction gas is cooled through a heat exchanger or quenching
There are two purposes: to control the temperature of the catalyst layer above a certain level so that it remains within normal ranges, thereby protecting the equipment and the catalyst； Secondly, it is to keep the catalyst reaction temperature within the optimal range, thereby increasing the conversion rate and enhancing the production capacity of the synthesis tower.
Controlling the bed temperature: a low ammonia concentration in the upper layer is kinetically controlled. At high ammonia concentrations in the lower layer, equilibrium control is applied, so the temperature requirements are different!
I have this same question too; I’ve studied * it