Hydrogen sulfide capture by limestone and dolomite at elevated pressure. 2. Sorbent particle conversion modeling

Cornelis A.P. Zevenhoven*, K. Patrik Yrjas, Mikko M. Hupa

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

34 Citations (Scopus)

Abstract

The physical structure of a limestone or dolomite to be used in in-bed sulfur capture in fluidized bed gasifiers has a great impact on the efficiency of sulfur capture and sorbent use. In this study an unreacted shrinking core model with variable effective diffusivity is applied to sulfidation test data from a pressurized thermogravimetric apparatus (P-TGA) for a set of physically and chemically different limestone and dolomite samples. The particle size was 250-300 μm for all sorbents, which were characterized by chemical composition analysis, particle density measurement, mercury porosimetry, and BET internal surface measurement. Tests were done under typical conditions for a pressurized fluidized-bed gasifier, i.e., 20% CO2, 950 °C, 20 bar. At these conditions the limestone remains uncalcined, while the dolomite is halfcalcined. Additional tests were done at low CO2 partial pressures, yielding calcined limestone and fully calcined dolomite. The generalized model allows for determination of values for the initial reaction rate and product layer diffusivity.

Original languageEnglish
Pages (from-to)943-949
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Volume35
Issue number3
DOIs
Publication statusPublished - Mar 1996
MoE publication typeA1 Journal article-refereed

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