Journal ArticleDOI
A review of the primary measures for tar elimination in biomass gasification processes
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In this paper, a review of the research and development in this area are reviewed and cited in the present paper, and the concepts of two-stage gasification and secondary air injection in the gasifier are of prime importance.Abstract:
Tar formation is one of the major problems to deal with during biomass gasification. Tar condenses at reduced temperature, thus blocking and fouling process equipments such as engines and turbines. Considerable efforts have been directed on tar removal from fuel gas. Tar removal technologies can broadly be divided into two approaches; hot gas cleaning after the gasifier (secondary methods), and treatments inside the gasifier (primary methods). Although secondary methods are proven to be effective, treatments inside the gasifier are gaining much attention as these may eliminate the need for downstream cleanup. In primary treatment, the gasifier is optimized to produce a fuel gas with minimum tar concentration. The different approaches of primary treatment are (a) proper selection of operating parameters, (b) use of bed additive/catalyst, and (c) gasifier modifications. The operating parameters such as temperature, gasifying agent, equivalence ratio, residence time, etc. play an important role in formation and decomposition of tar. There is a potential of using some active bed additives such as dolomite, olivine, char, etc. inside the gasifier. Ni-based catalyst are reported to be very effective not only for tar reduction, but also for decreasing the amount of nitrogenous compounds such as ammonia. Also, reactor modification can improve the quality of the product gas. The concepts of two-stage gasification and secondary air injection in the gasifier are of prime importance. Some aspects of primary methods and the research and development in this area are reviewed and cited in the present paper.read more
Citations
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Journal ArticleDOI
Tar removal performance of bio-oil scrubber for biomass gasification
Shunsuke Nakamura,Siriwat Unyaphan,Kunio Yoshikawa,Shigeru Kitano,Shuji Kimura,Hiroyuki Shimizu,Kazuya Taira +6 more
TL;DR: In this paper, the bio-oil absorbent was used as an absorbent for removing tar from the syngas and 73.3% of the gravimetric tar was removed by the absorbent at 50°.
Journal ArticleDOI
Experimental research on oxygen-enriched gasification of straw in an entrained-flow gasifier
TL;DR: In this paper, the effects of oxygen concentration (OC), equivalence ratio (ER), and reactor temperature on the produced gas composition, gasification index and tar yield were investigated in a lab-scale entrained-flow gasifier.
Journal ArticleDOI
Characterization of products derived from the high temperature flash pyrolysis of microalgae and rice hulls
TL;DR: In this article, flash pyrolyzed microalgae and rice hulls were flash-processed in a drop-tube reactor to form exclusively gas and solid products in the temperature range 1573-1873 K at gas residence times of 3-5
Journal ArticleDOI
Comparison of Ash Layer Formation Mechanisms on Si-Containing Bed Material during Dual Fluidized Bed Gasification of Woody Biomass
TL;DR: In this paper, the interaction between woody biomass ash and feldspar and olivine was studied with X-ray diffraction, scanning electron microscopy- energy dispersive x-ray spectroscopy, and secondary ion mass spectrometry, and the results were compared to calculations done with FactSage.
Journal ArticleDOI
Preparation of hydrogen via catalytic gasification of residues from biomass hydrolysis with a novel high strength catalyst
Wenzhi Li,Yongjie Yan,Tingchen Li,Zhengwei Ren,Miao Huang,Jun Wang,Mingqiang Chen,Zhi-cheng Tan +7 more
TL;DR: In this article, a study was carried out on the preparation of hydrogen via catalytic gasification of residues from biomass hydrolysis with a novel Ni/modified dolomite binary catalyst, which was prepared by a two-step coprecipitation method.
References
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Journal ArticleDOI
Review of literature on catalysts for biomass gasification
TL;DR: In this article, an extensive literature review of the three main groups of catalysts, which have been evaluated for the elimination of these hydrocarbons, are dolomite, alkali metals and nickel.
Journal ArticleDOI
The technical and economic feasibility of biomass gasification for power generation
TL;DR: In this paper, the costs and technologies involved in an integrated system for the production of electricity from biomass in general and wood in particular are reviewed, and the main conclusions are that wood handling, storage, drying, comminution and screening are well established and present no uncertainties in operation and performance.
Book
World energy assessment : energy and the challenge of sustainability
TL;DR: In this paper, the authors discuss the linkage between energy and economic, social, environmental, and security issues, and analyzes the contradictions between current patterns of use and objectives in these areas.
Journal ArticleDOI
Steam-gasification of biomass in a fluidised-bed of olivine particles.
TL;DR: In this paper, the catalytic behavior of olivine, a common, naturally occurring mineral containing magnesium, iron oxides and silica, was investigated in a laboratory scale, biomass gasification unit.
Journal ArticleDOI
Biomass gasification with air in an atmospheric bubbling fluidized bed. Effect of six operational variables on the quality of the produced raw gas
TL;DR: In this paper, the equivalence ratio (from 0.20 to 0.45), temperatures of the gasifier bed (750−850 °C) and of its freeboard (500−600 °C), H/C ratio in the feed, use of secondary air (10% of the overall) in the freeboard, and addition (2−5 wt %) of a calcined dolomite mixed with the biomass used as the feedstock.