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Millisecond catalytic wall reactors: I. Radiant burner
Author(s) -
Redenius J. M.,
Schmidt L. D.,
Deutschmann O.
Publication year - 2001
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690470523
Subject(s) - combustor , exothermic reaction , chemistry , heat transfer , gas burner , nuclear engineering , combustion , radiant heating , thermodynamics , mechanics , radiant energy , millisecond , chemical reactor , heat exchanger , catalytic combustion , radiation , optics , physics , engineering , organic chemistry , astronomy
Short‐contact‐time reactors have potential for high throughput in reactors much smaller than their traditional counterparts. While they operate adiabatically, heat can be exchanged at short contact time by integrating heat exchange into the reactor. Hot effluent of exothermic reaction systems can be redirected over feed gases to recuperate a portion of the sensible heat. Placing catalyst directly on reactor walls eliminates the resistance to heat transfer in the thermal boundary layer so that heat released by combustion can be effectively coupled to an emitter, such as in a radiant burner. A radiant heater was constructed, operated, and simulated incorporating short contact time, energy recuperation, and a catalytic wall. This burner operated stably for many hours at a firing rate from ∼50 to > 160 kW/m 2 at a radiant temperature of 950 to 1,150 K at a radiant efficiency of ∼60% with a residence time in the reacting zone of ∼10 ms. This reactor was modeled using 2‐D Navier‐Stokes equations including detailed models for chemistry and heat transport. Temperature and compositions predicted agreed well with experimental measurements.