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Waste gypsum bpard and ash related problems during combustion of biomass: Part 1 : fluidized bed
Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University.
Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University.
Åbo Akademi, Process Chemistry Centre, Åbo Akademi University.
Umeå university, Åbo Akademi, Energy Technology and Thermal Process Chemistry, Umeå University, Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University.
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2015 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 29, no 2, p. 877-893Article in journal (Refereed) Published
Abstract [en]

This paper is the first in a series of two describing the use of waste gypsum boards as an additive during combustion of biomass. This paper is focusing on experiments performed in a bench-scale bubbling fluidized-bed reactor (5 kW). Three biomass fuels were used; i.e. wheat straw (WS), reed canary grass (RC), and spruce bark (SB), with and without addition of shredded waste gypsum board (SWGB). The objective of this work was to determine the effect of SWGB addition on biomass ash transformation reactions during fluidized bed combustion. The combustion was carried out in a bed of quartz sand at 800 °C or 700 °C for 8 hours. After the combustion stage a controlled fluidized-bed agglomeration test was carried out to determine the defluidization temperature. During combustion experiments outlet gas composition was continuously measured by means of FT-IR. At the same place in the flue gas channel particulate matter (PM) was collected with a 13-stage Dekati low-pressure impactor. Bottom and cyclone fly ash samples were collected after the combustion tests. In addition, during the combustion tests a 6-hour deposit sample was collected with an air-cooled (430 °C) probe. All ash samples were analyzed by means of scanning electron microscope combined with energy dispersive X-ray spectrometer (SEM-EDS) for elemental composition and with X-ray powder diffractometer (XRD) for the detection of crystalline phases. Decomposition of CaSO4 originating from SWGB was mainly observed during combustion of reed canary grass at 800 °C. The decomposition was observed as doubled SO2 emissions. No significant increase of SO2 during combustion of SB and WS was observed. However, the interaction of SWGB particles with WS and SB ash forming matter, mainly potassium containing compounds, led to the formation of K2Ca2(SO4)3

Place, publisher, year, edition, pages
2015. Vol. 29, no 2, p. 877-893
National Category
Energy Engineering
Research subject
Energy Engineering
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URN: urn:nbn:se:ltu:diva-3091DOI: 10.1021/ef5024753ISI: 000349943300049Scopus ID: 2-s2.0-84923313466Local ID: 0df885ae-880d-4aec-b4fb-fe46d7794d3bOAI: oai:DiVA.org:ltu-3091DiVA, id: diva2:975947
Note
Validerad; 2015; Nivå 2; 20150119 (ohmmar)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Öhman, Marcus

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