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The problem of variable ratio control for primary and secondary flow rates

2016-04-05View Original

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In *ao acid production, in the ammonia/air cascade control, that is, variable ratio control, why is air chosen as the main flow rate while ammonia is used as the secondary flow rate? In most cases, shouldn’t air be used as the secondary flow? And based on the principle of selecting primary and secondary flows, air can certainly not be the primary flow, right? Dear colleagues, how can this issue be explained?

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