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Investigation of a High Pressure Oxy-Coal Process

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Cleaner Combustion and Sustainable World (ISCC 2011)

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Abstract

A study was conducted to investigate the feasibility of an oxy-coal process, which is pressurized to a combustion pressure of 80 bar. At that pressure the water-vapor can be separated economically from the CO2/H2O flue gases, either by nucleate condensation or by condensation on cooled surfaces in condenser heat exchangers at a temperature of about 300°C. The heat of condensation can be recaptured to preheat the boiler feed water. So the number of economizers is drastically reduced compared to a conventional steam cycle. Another interesting feature of the high pressure oxy-coal process is the fact, that low rank coal with high moisture content can be fired. Such a process at a pressure of about 80 bar is currently investigated by Babcock, USA, as the ThermoEnergy Integrated Power System (TIPS) and will be analyzed in the present paper. A known disadvantage of the oxy-coal processes is the large recirculating flue gas stream to control the combustion temperature, and which need large pipes and heavy recirculation fans. This disadvantage could be avoided if instead of flue gas a part of the condensed water from the condenser heat exchangers is recirculated.

Within the present study both types of processes have been simulated and for an electric power output of about 220 MW. Furthermore, results of CFD simulations of a pressurized 250 MW combustor with a single swirl burner and flue gas recirculation will be presented.

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Abbreviations

Ap :

particle surface area, m2

A:

pre-exponential factor, s-1, m3/kg s

cp :

specific heat, J/kg K

dp :

particle diameter, m

Dfl :

flame diameter, m

D0 :

diffusion coefficient, m2/s

Dout :

burner outlet diameter, m

h:

specific enthalpy, J/kg

ΔHevap :

heat of evaporation, J/kg

k:

turbulent kinetic energy, m2/s2

m:

mass flow rate, kg/s

Lfl :

flame length, m

M:

molecular mass, kg/kmol

Nu:

Nusselt number, –

p:

pressure, Pa

Pr:

Prandtl number, –

R:

general gas constant, J/kg K

Re:

Reynolds number, –

t:

time, s

T:

temperature, K

Tg :

gas temperature, K

Tp :

particle temperature, K

α:

heat transfer coefficient, W/m2K

ε:

dissipation of k, m2/s3

λ:

heat conductivity, W/mK

ρ:

density, kg/m3

ξ:

mass fraction, –

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Acknowledgment

The author gratefully acknowledge the support of Dr. Dobrin Toporov, now with Uhde GmbH Gas Technologies Division in Dortmund, Germany.

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Authors and Affiliations

  1. Institute of Heat and Mass Transfer, RWTH Aachen University, Aachen, Germany

    U. Renz

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  1. U. Renz
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Correspondence to U. Renz .

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Editors and Affiliations

  1. Institute of Thermal Engineering, Tsinghua University, Beijing, China, People's Republic

    Haiying Qi

  2. Institute of Thermal Engineering, Tsinghua University, Beijing, China, People's Republic

    Bo Zhao

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Renz, U. (2013). Investigation of a High Pressure Oxy-Coal Process. In: Qi, H., Zhao, B. (eds) Cleaner Combustion and Sustainable World. ISCC 2011. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30445-3_18

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  • DOI: https://doi.org/10.1007/978-3-642-30445-3_18

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-30444-6

  • Online ISBN: 978-3-642-30445-3

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