TITLE (Tahoma 14, all caps)
*Authors (Tahoma 12)
Affiliation (Tahoma 10 italics)
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Abstract for oral/poster* presentation [*please edit] (Tahoma 11, 1.15 line spacing):
(Indent at 1.25, justified)
Carbon dioxide emission from power sector causes a
significant impact on greenhouse effect. Polish power generation sector is mainly based on
hard coal and lignite fired power plants. Oxyfuel combustion of coal is a promising future
technology while the retrofitting of existing boilers to enable O2-enriched atmosphere
combustion can bridge the gaps resulting from present high oxygen costs and the lack of
continuous large scale operation of such units. The main advantages of pressurized oxycombustion of coal are: the increment of net efficiency of power generation, reduced size of
the boilers and reduced costs of flue gas CO2capture and compression ready to
sequestration.
The issue of this work was to evaluate the combustion behavior of coal chars under
oxyfuel combustion atmosphere. Four different chars from Polish coals (two hard coals and
two lignites) were examined in a pressurized system to test the reactivity of chars. The chars
of fuels for high pressure oxy-combustion were obtained by devolatilisation of hard coals and
lignites at atmospheric pressure in bench scale laboratory reactor at the temperature of 1273
K. The combustion rate of char particles was observed as a function of time by measuring
CO2, CO and O2 at the outlet. The combustion at 773, 873, 973 K and total pressure of 0.1,
0.3, 0.5 MPa were investigated. Mixtures of gases containing 20, 30 and 40% of O2 (in the
mixture of O2/CO2) have been used as an oxidant. Effect of temperature and total pressure
with a fixed mole concentration and effect of partial O2 pressure were studied in this work.
Additionally, the thermal behavior of the selected fuel was investigated at the oxycombustion conditions under atmospheric pressure. Tests have been conducted in
thermogravimetric analyzer NETSCH STA 409PG Luxxwith on-line quadrupole mass
spectrometer. The oxy-combustion experiments were carried out under atmosphere of
variable O2/CO2ratio with 5mg samples.
Keywords: coal char, oxyfuel combustion, thermogravimetric analysis
Acknowledgement: The scientific work was supported by National Centre of Research and
Development, as Strategic Project PS/E/2/6642/10 “Advanced Technologies for Energy
Generation: Oxy-combustion technology for PC and FBC boilers with CO2 capture
* Corresponding author:
e-mail: pbabinski@ichpw.zabrze.pl
Tel: +48 32 271 00 41 int. 211, fax. +48 32 271 08 09