Biomass gasification: Produced gas upgrading by in-bed use of dolomite

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie9703797· OSTI ID:603779

Olivares, A; Aznar, M P; Caballero, M A; Gil, J; Frances, E ^[1]; Corella, J ^[2]

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1. Univ. of Saragossa (Spain). Chemical and Environmental Engineering Dept.
2. Univ. Complutense of Madrid (Spain). Chemical Engineering Dept.

When some calcined dolomite (OCa{center_dot}OMg) is used in the bed of a biomass gasifier of fluidized bed type the raw gas produced is cleaner than when only silica sand is used in it as fluidizing medium. In-bed dolomite changes the product distribution at the gasifier exit because of in-situ catalytic reactions promoted by the calcined dolomite. Gasifying with steam-O{sub 2} mixtures causes the tar content in the exit gas to decrease from 12 to 2--3 g tar/m{sup 3}{sub n}, the H{sub 2} content to increase from 25--28 to 43 vol%, and the CO content to decrease from 45 to 27 vol% when the gas and char yields, heating value of the gas, and other main variables also undergo important changes because of the in-bed dolomite. The experimental work here reported is carried out at small pilot plant scale in a 15 cm i.d. atmospheric and bubbling fluidized bed gasifier fed by 10 kg biomass/h. Dolomite is continuously fed to the gasifier, mixed with the biomass in percentages of 2--3 wt% of the total mass flow fed. A 10 wt% of calcined dolomite in the gasifier bed is enough to significantly improve the product distribution and gas quality.

• OSTI ID: 603779
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 12 Vol. 36; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
BIOMASS
CALORIFIC VALUE
CHARS
DOLOMITE
FUEL GAS
GAS GENERATORS
GASIFICATION
SCRUBBING
SORBENT INJECTION PROCESSES