Laboratory measurement of combustion kinetics of retorted western oil shale
Conference
·
OSTI ID:10165835
Combustion of retorted oil shale is an integral part of Lawrence Livermore National Laboratory`s Hot-Recycle-Solids (HRS) process, providing both heat and the heat transfer medium necessary for pyrolysis of the shale. Although several studies of retorted shale combustion are available in the literature, there appears to be some uncertainty about the effective order of the reaction with respect to its two main reactants, char and oxygen. In addition, most of the experimental work on combustion kinetics has purposely stayed away from the regime where transport processes are important, even though transport plays a key role in combustion processes in a real process. We have investigated, therefore, the kinetics of the combustion of pyrolyzed Anvil Points oil shale in a laboratory scale, fluid bed pyrolysis/combustion apparatus. Our kinetics data is best fit by a rate expression that is second order in char concentration and one half order in oxygen concentration, with an activation energy of 71.2 kJ/mol and an Arrhenius pre-exponential factor of 74.2 s{sup {minus}1} Pa{sup {minus}{1/2}}. A detailed model of transport processes occurring in a particle has been used to help analyze the data and gain insight into the role of internal diffusion processes. The model is capable of computing both composition and temperature profiles within the particle. Gas transport calculations make use of a full Stefan-Maxwell formulation.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10165835
- Report Number(s):
- UCRL-JC--109239; CONF-9204147--3; ON: DE92018060
- Country of Publication:
- United States
- Language:
- English
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