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Prevention of the ash deposits by means of process conditions in biomass gasification; Biomassapolttoaineiden tuhkan kuonaantumiskaeyttaeytymisen estaeminen prosessiolosuhteiden avulla

Abstract

In fluidised-bed gasification, various types of deposits and agglomerates may be formed by biomass ash in the bed, in upper zones of the reactor, for instance in cyclones. These may decisively hamper the operation of the process. The aim of the project was to obtain data on the detrimental fouling behaviour of the ash of different types of biomass in fluidised-bed gasification, and on the basis of these data to determine the process conditions and ways of preventing this kind of behaviour. Different types of biomass fuel relevant to energy production such as straw, wood residue were be used as samples. The project consisted of laboratory studies and fluidised-bed reactor tests including ash behaviour studied both in the bed and freeboard. In laboratory tests, the sample material was characterised as a function of different process parameters. In fluid-bed reactors, the most harmful biomasses were tested using process variables such as temperature, bed material and the gasification agents. Bubbling fluidised-bed gasification tests with wheat straw showed that agglomerates with different sizes and structures formed in the bed depending on the temperature, the feed gas composition and bed material. Agglomerates consisted of molten ash which sintered with bed material and other solids.  More>>
Authors:
Moilanen, A; Laatikainen-Luntama, J; Nieminen, M; Kurkela, E; Korhonen, J [1] 
  1. VTT Energy, Espoo (Finland)
Publication Date:
Oct 01, 1997
Product Type:
Technical Report
Report Number:
AAA-LIEKKI-L97-1-Pt.2
Reference Number:
SCA: 090900; PA: FI-97:003574; EDB-97:129618; SN: 97001852397
Resource Relation:
Other Information: DN: LIEKKI 2 Research Programme; PBD: 1997; Related Information: Is Part Of LIEKKI 2 - Annual Review 1997. Project reports; Hupa, M.; Matinlinna, J.; Ljung, M. [eds.]; PB: 484 p.
Subject:
09 BIOMASS FUELS; ASHES; GASIFICATION; BIOMASS; FLUIDIZED BEDS; DEPOSITS; FOULING; STRAW; BARK; WILLOWS; WOOD WASTES; FLUIDIZED BED REACTORS
OSTI ID:
531303
Research Organizations:
Aabo Akademi, Turku (Finland). Combustion Chemistry Research Group
Country of Origin:
Finland
Language:
Finnish
Other Identifying Numbers:
Other: ON: DE98701757; CNN: Project TEKES-LIEKKI2-319; ISBN 951-650-955-X; TRN: FI9703574
Availability:
OSTI as DE98701757
Submitting Site:
FI
Size:
pp. 577-593
Announcement Date:

Citation Formats

Moilanen, A, Laatikainen-Luntama, J, Nieminen, M, Kurkela, E, and Korhonen, J. Prevention of the ash deposits by means of process conditions in biomass gasification; Biomassapolttoaineiden tuhkan kuonaantumiskaeyttaeytymisen estaeminen prosessiolosuhteiden avulla. Finland: N. p., 1997. Web.
Moilanen, A, Laatikainen-Luntama, J, Nieminen, M, Kurkela, E, & Korhonen, J. Prevention of the ash deposits by means of process conditions in biomass gasification; Biomassapolttoaineiden tuhkan kuonaantumiskaeyttaeytymisen estaeminen prosessiolosuhteiden avulla. Finland.
Moilanen, A, Laatikainen-Luntama, J, Nieminen, M, Kurkela, E, and Korhonen, J. 1997. "Prevention of the ash deposits by means of process conditions in biomass gasification; Biomassapolttoaineiden tuhkan kuonaantumiskaeyttaeytymisen estaeminen prosessiolosuhteiden avulla." Finland.
@misc{etde_531303,
title = {Prevention of the ash deposits by means of process conditions in biomass gasification; Biomassapolttoaineiden tuhkan kuonaantumiskaeyttaeytymisen estaeminen prosessiolosuhteiden avulla}
author = {Moilanen, A, Laatikainen-Luntama, J, Nieminen, M, Kurkela, E, and Korhonen, J}
abstractNote = {In fluidised-bed gasification, various types of deposits and agglomerates may be formed by biomass ash in the bed, in upper zones of the reactor, for instance in cyclones. These may decisively hamper the operation of the process. The aim of the project was to obtain data on the detrimental fouling behaviour of the ash of different types of biomass in fluidised-bed gasification, and on the basis of these data to determine the process conditions and ways of preventing this kind of behaviour. Different types of biomass fuel relevant to energy production such as straw, wood residue were be used as samples. The project consisted of laboratory studies and fluidised-bed reactor tests including ash behaviour studied both in the bed and freeboard. In laboratory tests, the sample material was characterised as a function of different process parameters. In fluid-bed reactors, the most harmful biomasses were tested using process variables such as temperature, bed material and the gasification agents. Bubbling fluidised-bed gasification tests with wheat straw showed that agglomerates with different sizes and structures formed in the bed depending on the temperature, the feed gas composition and bed material. Agglomerates consisted of molten ash which sintered with bed material and other solids. In all BFB tests, freeboard walls were slicked by ash agglomerates (different amounts) which, however, were easily removable. The results of this project and the earlier pilot-scale gasification experience obtained with the same feedstocks showed that useful characteristic data about ash behaviour can be obtained using laboratory tests and small scale reactors. (orig.)}
place = {Finland}
year = {1997}
month = {Oct}
}