• Two New Articles Published in our Online Combustion Journal

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This week, two new articles have been published in the IFRF Combustion Journal (http://www.journal.ifrf.net) entitled:

Article No. 200307
Advanced Laser Spectroscopy in Combustion Diagnostics


Article No. 200308
Particle Size Distribution of Black Liquor Sprays with A High Solids Content in Recovery Boilers


Article No. 200307
Prof. Jürgen Wolfrum
Universität Heidelberg
Physikalisch-Chemisches Institut
Im Neuenheimer Feld 253
Heidelberg, Germany

Tel.: 49 6221 54 8462
Fax : 49 6221 54 4255

Article No. 200308
Ari Kankkunen
Laboratory of Energy Engineering and Environmental Protection
Helsinki University of Technology
P.O. Box 4400
Sähkömiehentie 4
FIN-02015 HUT, Finland

Tel.: 358 9 4513627
Fax : 358 9 4513418


Article No. 200307
Advanced Laser Spectroscopy in Combustion Diagnostics

In recent years, a large number of linear and nonlinear laser-based diagnostic techniques for non-intrusive measurements of species concentrations, temperatures, and gas velocities in a wide pressure and temperature range with high temporal and spatial resolution were developed and have become extremely valuable tools to study many aspects of combustion. Nonlinear laser spectroscopic techniques using infrared-visible sum-frequency generation can now bridge the pressure and materials gap to provide kinetic data for catalytic combustion. Laminar flames are ideal objects to develop the application of laser spectroscopic methods for practical combustion systems and to test and improve gas-phase reaction mechanism in combustion models. Non-intrusive laser point and field measurements, especially joint velocity-scalar data at the same point in space and time, are of basic importance in the validation and further development of turbulent combustion models. Finally, the potential of laser techniques for active combustion control in various devices from pressurized fluidized-bed reactors to gas fired power plants and municipal waste incinerators are illustrated.

Article No. 200308
Particle Size Distribution of Black Liquor Sprays with A High Solids Content in Recovery Boilers

This study deals with fuel injection in kraft recovery boilers used in pulp mills. Black liquor is sprayed into the furnace of a recovery boiler through large splashplate nozzles. The drop size and drop size distribution of black liquor sprays have a major impact on the operation of a recovery boiler. When they are entrained by upwards-flowing flue gas flow, small droplets form carry-over and cause the fouling of heat transfer surfaces. Large droplets hit the char bed and the walls of the furnace without being adequately dried.  In this study, the drop size of black liquor with a high solids content was measured for two types of industrial-scale splashplate nozzles. The mass flow rate was varied between 4.3 and 6.1 kg/s and the spraying temperature was varied between 130-135%u030AC. The excess temperature above the elevated boiling point (EBP) varied between 14-18%u030AC.  The drop size and drop size distribution of black liquor sprays were measured by an image-analysis-based method. Although the spray consisted of spherical and non-spherical particles, it was assumed that non-spherical particles would form spherical droplets. Four theoretical drop size distributions were compared by the method of least-square difference.  The square-root normal distribution was slightly better compared to the log-normal, Rosin-Rammler, and normal distributions. The median diameter of equivalent spheres varied from 5 to 11.6 mm, when the square-root normal distribution was adapted. The span of drop size distribution was roughly 1.2. The volume median diameters were remarkably higher than those detected earlier for black liquor with lower solids content.

The full paper may be downloaded from the server, in the “New Papers” section (http://www.journal.ifrf.net/articles.html), by clicking on the Acrobat PDF icon alongside the title.

Publication in the Journal
The Editor-in-Chief (See associated article in this edition of the MNM) 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 journal@ifrf.net. 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.