By William L. Luyben
Chemical Reactor layout and keep watch over makes use of procedure simulators like Matlab®, Aspen Plus, and Aspen Dynamics to check the layout of chemical reactors and their dynamic keep an eye on. there are various books that concentrate on steady-state reactor layout. There are not any books that reflect on sensible keep watch over structures for genuine business reactors. This targeted reference addresses the simultaneous layout and keep watch over of chemical reactors. After a dialogue of reactor fundamentals, it: Covers 3 different types of classical reactors: non-stop stirred tank (CSTR), batch, and tubular plug stream Emphasizes temperature regulate and the severe influence of steady-state layout at the dynamics and balance of reactors Covers chemical reactors and keep an eye on difficulties in a plantwide surroundings contains various tables and indicates step by step calculations with equations Discusses easy methods to use technique simulators to deal with different concerns and kinds of operationsThis is a realistic reference for chemical engineering execs within the technique industries, pros who paintings with chemical reactors, and scholars in undergraduate and graduate reactor layout, method keep watch over, and plant layout classes.
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Extra info for Chemical Reactor Design and Control
The flowrate of the cooling medium becomes very large as the jacket temperature approaches the supply coolant temperature of 294 K. As the design conversion x increases, reactor size increases, which provides more heat transfer area. Although the heat transfer rate increases, the jacket temperature is higher because the larger area requires a smaller DT driving force. These results indicate that there may be an operability limit to raising reactor temperature for the purpose of reducing capital investment.
The temperature differential driving force for heat transfer is a log mean average of the differential temperatures at the two ends of the coil DTin ¼ TR À TC,in DTout ¼ TR À TC,out (DT)LM ¼ DTin À DTout DTin ln DTout (2:19) where TC,in is the supply temperature of the cooling medium (K) and TC,out is the temperature of the cooling medium leaving the coil (K). The energy balance on the coil is given in Eq. 1 45 IRREVERSIBLE, SINGLE REACTANT There are several issues to be resolved in the design of a cooling coil regarding the physical layout of the coil in the vessel.
The outside film coefficient ho in the jacket can be estimated from the Dittus –Boelter equation for flow through a pipe if a suitable equivalent diameter is used: ho Deq VDeq r 0:8 cp m1=3 m 0:14 ¼ 0:027 m k k mW 1 (2:16) C. J. Geankoplis, Transport Processes and Unit Operations, 3rd edition, Prentice-Hall, 1993, pp. 238, 300, 302. 1 IRREVERSIBLE, SINGLE REACTANT 41 Here, the equivalent diameter for an annular space is the distance between the vessel wall and the jacket wall. This same equation can be used to estimate the inside film coefficient in a cooling coil.
Chemical Reactor Design and Control by William L. Luyben