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Transient Catalytic Activity of Calcined Dolomitic Limestone in a Fluidized Bed during Gasification of Woody Biomass.

SYSNO ASEP	0460413
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Transient Catalytic Activity of Calcined Dolomitic Limestone in a Fluidized Bed during Gasification of Woody Biomass.
Author(s)	Pohořelý, Michael (UCHP-M)_{RID, ORCID, SAI} Jeremiáš, Michal (UCHP-M)_{RID, ORCID, SAI} Skoblia, S. (CZ) Beňo, Z. (CZ) Šyc, Michal (UCHP-M)_{RID, SAI, ORCID} Svoboda, Karel (UCHP-M)_{RID, ORCID, SAI}
Source Title	Energy and Fuels. - : American Chemical Society - ISSN 0887-0624 Roč. 30, č. 5 (2016), s. 4065-4071
Number of pages	7 s.
Language	eng - English
Country	US - United States
Keywords	fluidized- bed gasification ; woody biomass ; limestone
Subject RIV	CI - Industrial Chemistry, Chemical Engineering
R&D Projects	GC14-09692J GA ČR - Czech Science Foundation (CSF)
Institutional support	UCHP-M - RVO:67985858
UT WOS	000376417600056
EID SCOPUS	84970948034
DOI	10.1021/acs.energyfuels.6b00169
Annotation	Calcined dolomitic limestone mixed with silica sand in a fluidized bed can catalytically enhance the gasification of woody biomass. The lime is prone to attrition and carry over from the reactor and to deactivation caused by pore sintering; therefore, it has to be replenished continuously or periodically to maintain catalytic activity of the fluidized bed. The main aim of this paper was to explore the level of the decrease of the catalytic activity of the fluidized bed if the limestone is not replenished and to estimate a critical period for its top-up. Wood chips were gasified first in a silica sand fluidized bed (1080 g), to obtain background data without the catalytic effect of limestone. After 5 h of operation, dolomitic limestone (1050 g) was added to the fluidized bed and left to calcine. Its catalytic activity was monitored during the following 6 h. During the second part of the experiment, the yield of the main gases (H2, CO, CH4, CO2, and H2O) remained almost unchanged. The yield of minor organic gases and tars rose slightly but still remained far below the value attained with only silica sand. The heavy polyaromatic tar compounds were effectively decomposed during the first 3 h after the addition of dolomitic limestone. It was concluded that the catalytic activity of dolomitic lime remains in an acceptable level during the first 3 h after its addition into the fluidized bed, suggesting that periodic rather than continuous replenishment of limestone should be sufficient.
Workplace	Institute of Chemical Process Fundamentals
Contact	Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
Year of Publishing	2017

Number of the records: 1