NAFEMS International Journal of CFD Case Studies

Volume 6, January 2007

ISSN 1462-236X

Coal Combustion - Partial Validation of a Complex Problem

P L Stephenson
RWE npower, Windmill Hill Business Park, Whitehill Way, Swindon, Wiltshire, SN5 6PB

https://doi.org/10.59972/k0tghmrx

Keywords: Partial Validation, Coal, Combustion, CFD, Combustion Test Facility, RWE npower

Abstract

This paper summarises efforts made over a number of years to apply CFD to coal combustion in the Combustion Test Facility (CTF) currently owned and operated by RWE npower. It formed a key part of a strategy to develop a CFD capability in this area. The first two applications (to a drop tube furnace and to the CTF fitted with one type of burner) were successful. However, a subsequent application (the CTF with a completely different burner) had only limited success. The precise reasons for this limited success apply solely to this particular application. However, the work raised two questions that are relevant to any industrial application of a commercial CFD code. Therefore the aim of this paper is to provide an overview of this work and to use the experience gained to discuss two questions. They are as follows:

• How can users obtain sufficient validation of CFD predictions of complex physical phenomena when commercial pressures mean that it is not possible to take detailed measurements?
• To what extent should users accept that the relevant physical models have been correctly implemented in a commercial code, without running detailed tests themselves?

References

[1] Stephenson, PL and Coney, M, 2003, Computer modelling of isothermal compression in the reciprocating compressor of a complete iso-engine, ICLASS2003, Sorrento, Italy, July 14-18.

[2] Ivings, M, Azhar, M, Carey, C, Lea, C, Ledin, HS, Sinai, Y, Skinner, C, Stephenson, P, 2004, Outstanding safety questions concerning the use of gas turbines for power generation – final report on the CFD modelling programme of work, HSL report CM/03/08

[3] O'Connor, M, Stephenson, P L, Whitehouse, M, Richards, D G, Hesselman, G, Macphail, J, Lockwood, F C, Williamson, J, Williams, A, and Pourkashanian, M, 1998, A collaborative project on the effects of coal quality on NOx emissions and carbon burnout in pulverised coal fired utility boilers, Paper at 12th IFRF Members' Conference, Noordwijkerhout, The Netherlands, 6 - 8 May.

[4] O’Connor, M, 1999, The effects of coal quality on NOx emissions and carbon burnout, ETSU report COAL R153

[5] Ghobadian, A, Lee, F, and Stephenson, P, 1999, Validation of the coal combustion capability in the Star-CD code, Symp on Computational fluid dynamics: technical developments and future trends. I Mech E, London, 13-14 Dec

[6] Stephenson, PL, 2003, Mathematical modelling of semi-anthracite combustion in a single-burner furnace, Fuel, vol 28, pp 2069 - 2073

[7] Lockwood, FC, and Shah, NG, 1981, A new radiation solution method for incorporation in general combustion prediction procedures, 18th Symp (Int) on Combustion, pp 1405-1414

[8] Field, MA, Gill, DW, Morgan, BB, and Hawksley, PGW, 1967, The combustion of pulverised coal, BCURA

[9] Rhine, JM, and Tucker, RJ, 1991, Modelling of gas-fired furnaces and boilers, McGraw-Hill Book Company.

[10] Stephenson, PL, 1994, The mathematical modelling of utility furnaces, BFRC Flame Days, 13-14 September 1994, University of Leeds

[11] Lu, G, Yan, Y, Riley, G, and Bheemul, H.C, 2002, Concurrent measurement of temperature and soot concentration of pulverized coal flames, , IEEE Transactions on Instrumentation and Measurement, Volume: 51 , pp 990 - 995

Cite this paper

P L Stephenson, Coal Combustion - Partial Validation of a Complex Problem, NAFEMS International Journal of CFD Case Studies, Volume 6, 2007, Pages 39-53, https://doi.org/10.59972/k0tghmrx