Preliminary determination of flame speeds from infrared images using image processing techniques in a 150 kWth coal-fired combustion test rig

AHMAD, RASHIDI and AZMI, AHMAD and CHUN, LOU and HAMDAN, HASSAN and MOHD., HARIFFIN BOOSROH and MOOK TZENG, LIM and NOOR AKMA WATIE MOHD, NOOR and SOONG DER, CHEN (2015) Preliminary determination of flame speeds from infrared images using image processing techniques in a 150 kWth coal-fired combustion test rig. In: Fourth International Conference On Advances in Mechanical, Aeronautical and Production Techniques - MAPT 2015, 26-27 September, 2015, Kuala Lumpur, Malaysia.

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Abstract

Flame speeds are important flame characteristics in combustion processes as it determines the stability of the flame. Accurate experimental measurements of flame speeds require optical systems and diagnostic instruments, such as those in schlieren photography. However, these systems are more suitable in laboratory environments. In industrial furnaces, simpler methods are required to determine the flame speeds for comparison. Infrared cameras are used to detect ‘hot spots’ in furnaces, and since the radiation intensity of the flame is indicated by the brightness of the pixels in the images, a sequence of images can be used to determine the difference in the pixels’ brightness, allowing determination of the flame’s movement and subsequently the flame speed. Thus, in this study, a tool to determine the flame speeds using an image processing technique is presented. Preliminary results of the flame speeds from a 150 kWth coal fired combustion test rig were obtained. The combustion test rig contains a moveable block that imparts a swirling flow with a swirl number of 2.0. Infrared images were recorded for liquid petroleum gas (LPG) flames and coal-flames. The approximated flame speeds show that the coal flames are highly fluctuating compared to liquid petroleum gas flames. This may be caused by the inertia of the coal particulates that have increased the turbulence of the gas flow.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: coal flames, flame speeds, image processing, infrared imaging.
Depositing User: Mr. John Steve
Date Deposited: 26 Apr 2019 04:29
Last Modified: 26 Apr 2019 04:29
URI: http://publications.theired.org/id/eprint/1445

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