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Oxy-fuel Combustion for Carbon Capture and Sequestration (CCS) from a Coal/Biomass Power Plant: Experimental and Simulation Studies

  • Nelia Jurado
  • Hamidreza G. DarabkhaniEmail author
  • Edward J. Anthony
  • John E. Oakey

Abstract

Oxy-fuel combustion is a promising and relatively new technology to facilitate CO2 capture and sequestration (CCS) for power plants utilising hydrocarbon fuels. In this research experimental oxy-combustion trials and simulation are carried out by firing pulverised coal and biomass and co-firing a mixture of them in a 100 kW retrofitted oxy-combustor at Cranfield University. The parent fuels are coal (Daw Mill) and biomass cereal co-product (CCP) and experimental work was done for 100 % coal (w/w), 100 % biomass (w/w) and a blend of coal 50 % (w/w) and biomass 50 % (w/w). The recirculation flue gas (RFG) rate was set at 52 % of the total flue gas. The maximum percentage of CO2 observed was 56.7 % wet basis (73.6 % on a dry basis) when 100 % Daw Mill coal was fired. Major and minor emission species and gas temperature profiles were obtained and analysed for different fuel mixtures. A drop in the maximum temperature of more than 200 K was observed when changing the fuel from 100 % Daw Mill coal to 100 % cereal co-product biomass. Deposits formed on the ash deposition probes were also collected and analysed using the environmental scanning electron microscopy (ESEM) with energy-dispersive X-ray (EDX) technique. The high sulphur, potassium and chlorine contents detected in the ash generated using 100 % cereal co-product biomass are expected to increase the corrosion potential of these deposits. In addition, a rate-based simulation model has been developed using Aspen Plus® and experimentally validated. It is concluded that the model provides an adequate prediction for the gas composition of the flue gas.

Keywords

Oxy-fuel combustion Carbon capture and sequestration (CCS) Co-firing coal and biomass Process modelling 

List of Abbreviations

CCP

Cereal co-product

CCS

CO2 capture and sequestration

db

Dry basis

EDX

Energy-dispersive X-ray

ESEM

Environmental scanning electron microscopy

FB

Fluidised bed

FTIR

Fourier transform infrared

NO

Nitric oxide

NOx

Nitrogen oxides

PF

Pulverised fuel

RFG

Recirculation flue gas

SOx

Sulphur oxide

w/w

Weight ratio

wb

Wet basis

Notes

Acknowledgments

The authors would like to thank the UK Engineering and Physical Sciences Research Council (EPSRC) and EON to the Oxy-Cap UK consortium for their financial support. The authors also acknowledge Dr. Jinsheng Wang from Canmet Energy for his help with FACT simulations.

This chapter is an augmented version of a paper presented at the International Conference on Clean Energy 2014 (ICCE-2014), in June 2014, Istanbul, Turkey.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Nelia Jurado
    • 1
  • Hamidreza G. Darabkhani
    • 1
    Email author
  • Edward J. Anthony
    • 1
  • John E. Oakey
    • 1
  1. 1.Centre for Combustion and CCS, School of Energy, Environment and Agrifood (EEA)Cranfield UniversityCranfield, BedfordshireUK

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