Authors:
T. Kaljuvee Tallinn University of Technology Tallinn Estonia 19086 Ehitajate tee 5 Tallinn Estonia 19086 Ehitajate tee 5

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M. Toom Tallinn University of Technology Tallinn Estonia 19086 Ehitajate tee 5 Tallinn Estonia 19086 Ehitajate tee 5

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A. Trikkel Tallinn University of Technology Tallinn Estonia 19086 Ehitajate tee 5 Tallinn Estonia 19086 Ehitajate tee 5

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R. Kuusik Tallinn University of Technology Tallinn Estonia 19086 Ehitajate tee 5 Tallinn Estonia 19086 Ehitajate tee 5

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Abstract  

The extensive use of fossil fuels in energy production causes serious pollution of atmosphere with SO2, CO2, NOx, etc. In Estonia the electricity production is based mainly on the pulverized firing (PF) of low-grade local fuel – Estonian oil shale (EOS) which is characterized by a low calorific value (~9 MJ kg–1) and a high content of mineral matter (65–70%) from which approximately 50% are carbonates. Since 2004, also two boilers based on circulating fluidized bed combustion (CFBC) of EOS are in exploitation. The present study is focused on the comparative investigation of the efficiency of different ashes collected from different technological points of CFB and PF boilers as sorbents for SO2. The influence of experimental temperature on the SO2-binding characteristics of ashes as well as the possibilities of activation of ashes (grinding, hydration) were investigated. It was shown that the SO2-binding capacity of initial ashes at 700C and p(SO2)=190 mm Hg was for CFBC ashes 24–30 mg and for PF ashes 10–23 mg SO2 per 100 mg sample, the best binding capacities belonging to economizer ash (ECOA) and electrostatic precipitator ash from the 1st field (PESPA1f), respectively. However, during initial stage of binding the best results were obtained with air pre-heater ash (PHAA) and ESPA1f (both CFBC ashes). Grinding improved the SO2-binding ability, being the most effective in the case of bottom ash (BA) from CFBC and cyclone ash (PCA) from PF – increase in binding capacity 2 and 2.3 times, respectively. As compared to initial CFBC ashes, the binding characteristics of PF ashes remained lower even after grinding. Hydration and previous calcination improved the binding characteristics only of PF ashes. Hereby, the SO2-binding ability of CFBC ashes is better than of PF ashes and they are more promising sorbents for acidic gases, for example, for sulphur dioxide.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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