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Yang, Jingjing
Publications (5 of 5) Show all publications
Yang, J., Lin, L., Morgalla, M., Gebremedhin, A. & Strand, M. (2015). High-Temperature Characterization of Inorganic Particles and Vapors in a Circulating Fluidized Bed Boiler Cofiring Wood and Rubber Waste. Energy & Fuels, 29(2), 863-871
Open this publication in new window or tab >>High-Temperature Characterization of Inorganic Particles and Vapors in a Circulating Fluidized Bed Boiler Cofiring Wood and Rubber Waste
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2015 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 29, no 2, p. 863-871Article in journal (Refereed) Published
Abstract [en]

The effects of varying fuel mixtures and using a lime additive were studied in a 125-MWth circulating fluidized bed boiler. A high-temperature aerosol measurement method using a hot-dilution probe was used to characterize the particles and condensing inorganic vapors upstream from the superheater. The particle size distributions of the extracted samples indicate that when high-sulfur rubber waste, waste wood, and forest fuel were cocombusted, the hot flue gas contained no substantial amount of particulate matter in the fine (<0.3 mu m) particle size range, although the SO2 concentration exceeded 70 ppm. Only a nucleation mode was observed, which was presumably formed from inorganic vapors that condensed in the sampling probe. The size-segregated elemental analysis of the extracted samples indicated that when lime was added, the nucleation mode mainly comprised condensed alkali chlorides, while the sulfates dominated the mode when no lime was added. The presumed explanation for the sulfates in the nucleation mode was the sulfation of the alkali chlorides inside the sampling system. When only the wood fuels and no rubber fuel were cocombusted, the SO2 concentration in the gas was approximately 5 ppm. In this case, an alkali sulfate particle mode formed at approximately 70 nm in the hot flue gas. In addition, vapors of alkali chlorides and lead formed particulate matter inside the sampling probe when using low dilution ratios.

National Category
Chemical Process Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-41910 (URN)10.1021/ef502455u (DOI)000349943300047 ()2-s2.0-84923309346 (Scopus ID)
Available from: 2015-04-09 Created: 2015-04-09 Last updated: 2019-02-22Bibliographically approved
Yang, J., Gebremedhin, A. & Strand, M. (2013). Characterization of Particles and Inorganic Vapors through High-Temperature Extraction in a Biomass-Fired Grate Boiler. Energy & Fuels, 27(10), 5915-5922
Open this publication in new window or tab >>Characterization of Particles and Inorganic Vapors through High-Temperature Extraction in a Biomass-Fired Grate Boiler
2013 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 27, no 10, p. 5915-5922Article in journal (Refereed) Published
Abstract [en]

In this study, a method for sampling particles and inorganic vapors in hot flue gases was examined in laboratory studies and then applied in field measurements. The method included a hot dilution probe, where the dilution ratio can be controlled. The laboratory results indicated that applied flow rates and dilution ratios can be optimized to produce two distinct particle modes in the particle size distribution: one from the original particles and one from the condensing vapors. The field measurements were performed in a moving grate biomass boiler, and the probe was used for sampling at two positions, at 800 and 1100 degrees C. The size distributions and the size-resolved elemental composition of the samples showed that, at 800 degrees C, alkali sulfates had formed a fine particle mass mode at around 100 nm and that alkali chlorides condensed in the probe to form an additional ultrafine mode in the 10-30 nm range. At 1100 degrees C, a similar bimodal size distribution was obtained as for 800 degrees C; however, the particle diameter of the fine mode was lower and the particle mass concentration was about one-third of the mass at 800 degrees C. The elemental analysis of the ultrafine mode sampled at 1100 degrees C indicated that it was formed mainly from condensing alkali sulfates. In addition, the sample contained detectable amounts of Zn. The suggested interpretation of these results was that, at 1100 degrees C, Zn had oxidized to form ZnO particles and that the formation and condensing of alkali sulfates was in progress, while alkali chlorides were present as vapor.

National Category
Industrial Biotechnology
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-31003 (URN)10.1021/ef4011498 (DOI)000326126700037 ()2-s2.0-84885988723 (Scopus ID)
Available from: 2013-12-06 Created: 2013-12-06 Last updated: 2017-12-06Bibliographically approved
Razmjoo, N., Sefidari, H., Strand, M. & Yang, J. (2013). Gas measurements and characterization of wood combustion in a traveling grate boiler. In: Proceedings for 21st European Biomass Conference and Exhibition: . Paper presented at 21st European Biomass Conference and Exhibition, Copenhagen, Danmark, 3rd-7th June, 2013 (pp. 591-594). ETA-Florence Renewable Energies
Open this publication in new window or tab >>Gas measurements and characterization of wood combustion in a traveling grate boiler
2013 (English)In: Proceedings for 21st European Biomass Conference and Exhibition, ETA-Florence Renewable Energies , 2013, p. 591-594Conference paper, Published paper (Refereed)
Abstract [en]

Experimental tests have been carried out on a moving grate boiler at a 4 MW heating plant located at a sawing mill in south of Sweden. In order to investigate the performance of the combustion chamber, the local concentrations of O2, NO and CO are determined in the region above the grate using two water-cooled stainless steel probes of different lengths and diameters. The fuel used was sawmill waste consisting of bark, sawdust and shavings. The results of the study provided valuable insights into the combustion process.

Place, publisher, year, edition, pages
ETA-Florence Renewable Energies, 2013
Series
European Biomass Conference and Exhibition Proceedings, ISSN 2282-5819
Keywords
combustion
National Category
Chemical Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-26905 (URN)10.5071/21stEUBCE2013-2CO.7.5 (DOI)978-88-89407-53-0 (ISBN)
Conference
21st European Biomass Conference and Exhibition, Copenhagen, Danmark, 3rd-7th June, 2013
Note

artikeln kommer kanske att finnas på sidan http://www.etaflorence.it/proceedings/

Available from: 2013-06-20 Created: 2013-06-20 Last updated: 2015-05-27Bibliographically approved
Yang, J., Gebremedhin, A. & Strand, M. (2013). Particle characterization at high temperature in a 5 MW moving grate biomass boiler. In: Proceedings for 21st European Biomass Conference and Exhibition: . Paper presented at 21st European Biomass Conference and Exhibition, Copenhagen, Danmark, 3rd-7th June, 2013 (pp. 1132-1135). ETA-Florence Renewable Energies
Open this publication in new window or tab >>Particle characterization at high temperature in a 5 MW moving grate biomass boiler
2013 (English)In: Proceedings for 21st European Biomass Conference and Exhibition, ETA-Florence Renewable Energies , 2013, p. 1132-1135Conference paper, Published paper (Refereed)
Abstract [en]

The particles and inorganic gaseous compounds from a 5 MW moving grate biomass boiler were characterized at two sampling positions at 1100 °C and 800 °C respectivly. Samples were extracted with high temperature sampling method with primary dilution ratio of 20. For both sampling positions a biomodal mass size distributions were observed, with ultrafine mode at around 70-100 nm and fine mode at 10-30 nm. The increasing concentration of ultrafine particle over time indicates that the alkali deposits in the inner wall of dilution probe re-evaporates and condenses on the ultrafine particles. The elemental analysis and ion ratio of (K+Na)/(Cl+2S) and 4S/O indicates that at 1100°C the main species composted of particulate matter are not only alkali chlorides and alkali sulfates.

Place, publisher, year, edition, pages
ETA-Florence Renewable Energies, 2013
Series
European Biomass Conference and Exhibition Proceedings, ISSN 2282-5819
Keywords
combustion
National Category
Chemical Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-26902 (URN)10.5071/21stEUBCE2013-2DV.3.23 (DOI)978-88-89407-53-0 (ISBN)
Conference
21st European Biomass Conference and Exhibition, Copenhagen, Danmark, 3rd-7th June, 2013
Available from: 2013-06-20 Created: 2013-06-20 Last updated: 2015-05-27Bibliographically approved
Strand, M., Gustafsson, E., Lin, L. & Yang, J. (2011). High-Temperature extraction of aerosol particles from biomass combustion and gasification. In: European Aerosol Conference 2011: . Paper presented at European Aerosol Conference.
Open this publication in new window or tab >>High-Temperature extraction of aerosol particles from biomass combustion and gasification
2011 (English)In: European Aerosol Conference 2011, 2011Conference paper, Published paper (Refereed)
National Category
Other Chemical Engineering
Research subject
Technology (byts ev till Engineering)
Identifiers
urn:nbn:se:lnu:diva-14257 (URN)
Conference
European Aerosol Conference
Available from: 2011-09-17 Created: 2011-09-17 Last updated: 2015-06-08Bibliographically approved
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