Nitrogen and sulfur conversion during pressurized pyrolysis under CO2 atmosphere in fluidized bed

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dc.contributor.authorDuan, Yuanqiang
dc.contributor.authorDuan, Lunbo
dc.contributor.authorAnthony, Edward J.
dc.contributor.authorZhao, Changsui
dc.date.accessioned2017-01-10T10:11:05Z
dc.date.available2017-01-10T10:11:05Z
dc.date.issued2016-10-25
dc.description.abstractPressurized oxy-fuel combustion (POFC) is a promising technology for CO2 capture from coal-fired power plants, offering both high efficiency and a low penalty. However, the high partial pressure of CO2 in a POFC furnace has important impacts on fuel-N and fuel-S conversion during the coal pyrolysis process, and understanding this will help to achieve further control of SOx/NOx. In this study, coal pyrolysis experiments were conducted in a pressurized fluidized bed with the pressure range of 0.1–0.7 MPa under N2 and CO2 atmosphere. The gaseous products were monitored by a Fourier transform infrared spectroscopy analyzer (FTIR) and the char residue was characterized by an X-ray photoelectron spectroscopy (XPS) analyzer in order to acquire the species information for S-containing and N-containing compounds. Results show that the enrichment of CO2 in the local atmosphere enhances the fuel-N conversion to HCN in the pyrolysis process, which serves as a favorable precursor to N2O. The generation of HCN and NH3 increase simultaneously with the increase of overall pressure. SO2 concentration in the gaseous product is relatively low, and as the pressure increases, the concentration decreases slightly due to CO reduction of SO2 to COS. Sulfur content in the char decreases as the pressure goes from 0.1 MPa to 0.7 MPa indicating higher CO2 pressure accelerates the decomposition of sulfur compounds in the coal, which is further confirmed by the XPS results.en_UK
dc.identifier.citationDuan Y, Duan L, Anthony EJ, Zhao C. (2017) Nitrogen and sulfur conversion during pressurized pyrolysis under CO2 atmosphere in fluidized bed. Fuel, Volume 189, February 2017, pp. 98-106en_UK
dc.identifier.cris15593460
dc.identifier.issn0016-2361
dc.identifier.urihttp://dx.doi.org/10.1016/j.fuel.2016.10.080
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/11235
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectPressurized oxy-fuel combustionen_UK
dc.subjectPyrolysisen_UK
dc.subjectCO2 atmosphereen_UK
dc.subjectNitrogen conversionen_UK
dc.subjectSulfur speciationen_UK
dc.titleNitrogen and sulfur conversion during pressurized pyrolysis under CO2 atmosphere in fluidized beden_UK
dc.typeArticleen_UK

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