CARS and Heat Flux Measurements in Regenerative and Conventional Industrial-Scale Burners
Authored by: P. M. Hughes, R. J. Lacelle, A. Idris, M. Legere, D. Percy, J. Wong, T. Parameswaran
Natural Resources Canada
CANMET Energy Technology Centre
1 Haanel Dr.
To send a mail to the Corresponding Author click here.
There is a great deal of interest in high temperature air combustion provided by the current regenerative burners for industrial furnaces. This paper presents experimental data from flames produced by a conventional low NOx burner with and without pre-heat and a self regenerative burner. The flame temperatures were measured with the laser-based CARS technique and suction pyrometer. T he radiant flux at the wall was measured with a 2 pi and a narrow angle radiometer. These data provide a detailed picture of the radiant properties of these flames which is important for the application of these burners in industrial combustion processes.
Keywords: Flameless, HITAC, regenerative, CARS, emissivity, radiative heat flux, heat flux
There has been an increased interest in high temperature air combustion provided by the current regenerative burners for many industrial processes. Initially, the interest was focused on processes in the steel industry; however, because of the high efficiency, low emissions and even heat distribution, this technology is envisioned for other industrial applications as well. To this end, a detailed characterization of the regenerative burner flame is required to understand the combustion performance and to develop the models used to simulate different industrial furnaces. The measurements discussed in this paper come from an ongoing project to compare conventional and regenerative burner flames and their application to different industrial processes. This paper describes the in-situ temperature, composition and radiative flux measurements taken in these flames.
The flames studied here are produced by a conventional low NOx burner with and without pre-heat and a self regenerative burner. The burners were operated at 200 kW with an excess oxygen of between 4 and 5%. The flame temperatures were measured with the laser-based CARS technique and suction pyrometer. The radiant flux at the wall was measured with a 2 pi and a narrow angle radiometer. A thermal load was applied to the combustion products with the intent of simulating an industrial process. The temperature measurements show that the regenerative flame has a lower mean temperature and an even distribution throughout the furnace. The fluctuating component of temperature is shown to be significantly smaller for the regenerative flame as compared to the conventional flames. The radiant properties of the flames are different as well. The regenerative flame is shown to have a slightly higher emissivity than does the conventional flame. The incident radiant flux from the regenerative flame is much higher than that of the conventional flame (with and without preheat).
The full paper may be downloaded from the server, in the “New Papers” section (http://www.journal.ifrf.net/articles.html).
Publication in the Journal
The Editor-in-Chief would like to remind all potential authors that publication in the Journal is open to all. If you have interesting results to publish in the field of, or related to, industrial combustion, we invite you to prepare a paper according to the guidelines given in the Author’s Guide on the website (http://www.journal.ifrf.net/).
Papers may be regular “articles” (typically up to 20 pages) or Communications (typically up to 4/5 pages). Review papers can of course be longer. Remember that figures and graphics in general can be in full color. This advantage should be encouraged.
All manuscripts and associated files, proposed for publication should be sent by the Corresponding Author in a compressed/zip file, as an email attachment to firstname.lastname@example.org. This file should include a statement that the proposal’s content is unpublished material that has not being submitted for publication elsewhere. When an article by the author(s) is cited in the proposed article as “in press”, a copy of this article should accompany the proposed article and should be included in the compressed file.
The Editor-in-Chief looks forward to receiving your proposals.