Multiple Adiabatic Tubular Reactors with Cold-Shot Cooling

6 MULTIPLE ADIABATIC TUBULAR REACTORS WITH COLD-SHOT COOLING 

The catalyst beds are mounted in a single reactor vessel because it is more economical than using multiple vessels. The spacing between beds is set at 1 m. The length-to-diameter aspect ratio of the vessel is 10. Because a multibed reactor must have internal piping, flow distributors, and bed supports, a multi-bed reactor vessel is more expensive than a simple vessel. We assume that each additional bed increases reactor capital cost by about 25%, as shown in Table 5.2. 

Note that there is no steam generated in the cold-shot system as there is in the interstaged cooled system, so there is no economic credit for steam generation. 

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