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Performance Analysis of Rdf Gasification in a Two Stage Fluid Bed - Plasma Process

Materazzi, M; Lettieri, P; Taylor, R; Chapman, C; (2016) Performance Analysis of Rdf Gasification in a Two Stage Fluid Bed - Plasma Process. Waste Management , 47 (B) pp. 256-266. 10.1016/j.wasman.2015.06.016. Green open access

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Abstract

The major technical problems faced by stand-alone fluidized bed gasifiers (FBG) for waste-to gas applications are intrinsically related to the composition and physical properties of waste materials, such as RDF. The high quantity of ash and volatile material in RDF can provide a decrease in thermal output, create high ash clinkering, and increase emission of tars and CO2, thus affecting the operability for clean syngas generation at industrial scale. By contrast, a two-stage process which separates primary gasification and selective tar and ash conversion would be inherently more forgiving and stable. This can be achieved with the use of a separate plasma converter, which has been successfully used in conjunction with conventional thermal treatment units, for the ability to ‘polish’ the producer gas by organic contaminants and collect the inorganic fraction in a molten (and inert) state. This research focused on the performance analysis of a two-stage fluid bed gasification–plasma process to transform solid waste into clean syngas. Thermodynamic assessment using the two-stage equilibrium method was carried out to determine optimum conditions for the gasification of RDF and to understand the limitations and influence of the second stage on the process performance (gas heating value, cold gas efficiency, carbon conversion efficiency), along with other parameters. Comparison with a different thermal refining stage, i.e. thermal cracking (via partial oxidation) was also performed. The analysis is supported by experimental data from a pilot plant

Type: Article
Title: Performance Analysis of Rdf Gasification in a Two Stage Fluid Bed - Plasma Process
Event: AIChE Annual meeting
Location: San Francisco
Dates: 03 November 2013 - 08 November 2013
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.wasman.2015.06.016
Publisher version: http://dx.doi.org/10.1016/j.wasman.2015.06.016
Language: English
Additional information: © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CCBY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Keywords: RDF; Gasification; Fluidized bed; Plasma; Conversion efficiency
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1409124
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