Reduction of Hot Spot in Multi-injection Reactors

Number of Injection Points The hot spot within a multi-injection reactor is controlled mainly by the amount of injection points (Af). For a first approximation of the temperature rise at each injection point, a simplified system can be considered [34]. For the case of instantaneous mixing and reaction with an equally distributed flow among the injection points (1 2i = 22 = = = 2o/ )  

The adiabatic temperature rise for a single-injection reactor is defined as 

The temperature rise at each injection point referred to the adiabatic temperature rise obtained in reactors with only one inlet (AT = 1) is expressed in Equation 5.66. 

Rewriting Equation 5.66, the maximum number of injection points required to avoid a temperature rise higher than can be estimated as a function of 

one has to choose carefully the characteristic cooling time to avoid the accumulation of heat in the reactor. 

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