12th ECCRIA Conference

The European Conference on Fuel and Energy Research

and its Applications

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Alan Thompson

2nd June 2017


Experimental Study on Pressurized Oxyfuel Combustion of Coal

*P. Babinski, M. Tomaszewicz, M. Sciazko, J. Zuwala, T. Topolnicka

Institute for Chemical Processing of Coal,

41-803 Zabrze, 1 ZamkowaStr, Poland

Abstract for oral/poster* presentation [*please edit]

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 oxy-combustion 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 oxy-combustion 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:

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Tel: +48 32271 00 41 int. 211, fax. +48 32271 08 09,