Applicability of the Peclet number approach to blow-off and flashback limits of common steelworks process gases

Giles, A. P. ORCID: https://orcid.org/0000-0002-1221-5987, Marsh, R. ORCID: https://orcid.org/0000-0003-2110-5744, Bowen, P. J. ORCID: https://orcid.org/0000-0002-3644-6878 and Valera-Medina, A. 2016. Applicability of the Peclet number approach to blow-off and flashback limits of common steelworks process gases. Fuel 182 , pp. 531-540. 10.1016/j.fuel.2016.05.082

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Abstract

The ever-increasing importance of energy efficiency has given rise to numerous areas of concern for operators and developers of combustion plants; as the need to utilise fuel gases of increasingly poor quality and variability is essential for sustainability, while emission standards continuing to become more stringent. Swirl combustors are ubiquitous in industry owing to their great stability range which occurs due to the formation of a CRZ, which through the recycling of heat and active chemical species to the root of the flame enhances stability over a wide range of operating conditions. Alternative fuels containing hydrogen offer the possibility of reduced greenhouse gas emissions; however flashback is of special concern with hydrogen enriched fuels, owing to the very high flame speed of hydrogen. Many by-products of process and waste industries can include a high proportion of hydrogen, for example Coke Oven Gas. Alternatively, many by-product process gases can contain a high proportion of non-combustible species such as nitrogen and carbon dioxide which can substantially reduce their flame speed and as a consequence increase the possibility of the flame extinguishing through blow-off. This paper examines the blow-off and flashback potential of common steelworks process gases (including one which contains hydrogen) in a compact, premixed swirl burner in swirl number regimes representative of those found in practical systems. Methane is used as a base fuel for comparison. All results are obtained at atmospheric pressure without air preheat. The Peclet number modelling approach incorporating a flame quenching parameter was applied to the results obtained for each of the fuel gases. Using this model, the quench factor value was seen to be dependent on burner configuration as well as fuel composition. It was found that the stable burner operating conditions significantly change from fuel to fuel; with the operating points at which flashback occurs with Coke Oven Gas producing blow-off with weaker process gases such as Blast Furnace Gas and Basic Oxygen Steelmaking gas.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0016-2361/ (accessed 03/08/2016)
Publisher:	Elsevier
ISSN:	0016-2361
Date of First Compliant Deposit:	3 August 2016
Date of Acceptance:	12 May 2016
Last Modified:	03 Dec 2024 17:30
URI:	https://orca.cardiff.ac.uk/id/eprint/92527

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