Model for the sulfidation of calcined limestone and its use in reactor models
- Twente Univ. of Technology, Enschede (Netherlands). Dept. of Chemical Engineering
Limestone, both in raw and in calcined form, can be used to remove H{sub 2}S from coal gas. A mathematical model describing the sulfidation of a single calcined limestone particle was developed and experimentally verified. This model, which includes no fitting parameters, assumes a calcined limestone particle to consist of spherical grains of various sizes that react with H{sub 2}S according to the elastic shrinking-core model. The initial size distribution of the grains is derived from mercury porosimetry. The transport of H{sub 2}S through the bidisperse limestone particle is calculated based on the random-pore model of Wakao and Smith, which distinguishes macropore and micropore zones. Knudsen diffusivity inside the micropore zones is calculated according to the dusty-gas approach. The single-particle model delivers the value of a new defined utilization factor, which includes effects of external mass-transfer limitation, pore-diffusion limitation, and grain-size distribution on particle reactivity. A correlation derived for a single batch of calcined limestone explicitly expresses this utilization factor as a function of conversion and relevant process parameters. This correlation can be easily incorporated into reactor models, as shown for an existing model describing the capture of H{sub 2}S by a fluidized bed of calcined limestone particles.
- OSTI ID:
- 655503
- Journal Information:
- AIChE Journal, Journal Name: AIChE Journal Journal Issue: 7 Vol. 44; ISSN 0001-1541; ISSN AICEAC
- Country of Publication:
- United States
- Language:
- English
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