The importance of vaporization kinetics in the pyrolysis of solid fuels
โ Scribed by H.D. Do; P.R.F. Bell
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 794 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0009-2509
No coin nor oath required. For personal study only.
โฆ Synopsis
A vaporization step is assumed to occur inside particles during isothermal pyrolysis reactions. An intraparticle mass transfer model is developed which incorporates this vaporization mechanism together with pore expansion and convective flow. The basic model concepts should be applicable to a wide range of materials undergoing pyrolysis. The model is demonstrated for oil shale pyrolysis. The results show that the vaporization step could well limit the overall kinetics of oil production from such systems.
๐ SIMILAR VOLUMES
The kinetics of the thermal conversion of aromatic hydrocarbons in the presence of hydrogen and steam were studied, using anphthalene, toluene and benzene as model compounds. The experiments were performed in a tubular flow reactor at a total pressure of 160 KPa, temperatures of 700-14OO"C, residenc
The effect of the yield and composition of the liquid products on the formation of the porous structure of semicoke is examined. The more complete desorption of the low molecular weight components in a stream of water vapour up to 300ยฐC leads to a considerable increase in the total pore volume and t
New theory is developed to define the parameters controlling the pyrolysis rate of single particles. It is shown that the relative importance of internal and external heat transfer and of the, intrinsic (first order) pyrolysis kinetics can be determined from the Biot number (hR/K) and, depending on