The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Julien Blondeau - One of the best experts on this subject based on the ideXlab platform.
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online adjustment of furnace exit gas temperature field using advanced infrared pyrometry case study of a 1500 mwth utility boiler
Case Studies in Thermal Engineering, 2020Co-Authors: Julien Blondeau, J Van Den Auweele, S Alimuddin, F Binder, Francesco TuroniAbstract:Abstract The Furnace Exit Gas Temperature (FEGT) is a key parameter of the combustion process in utility boilers that needs to be accurately monitored, especially in order to increase their load- and fuel-flexibility. However, neither the average FEGT nor its spatial distribution over the boiler cross section can be measured using standard equipment. Advanced pyrometry provides an accurate and efficient way to monitor the FEGT: by combining the signals from several Pyrometers installed around the boiler, the FEGT 2D field can be reconstructed. In this paper, we show the results of a measurement campaign carried out on a 1500 MWth boiler using a system comprising 9 infrared Pyrometers. Thanks to online adjustments of the combustion air distribution, the FEGT peak initially observed has been reduced by approximately 100 o C, and the flame has been recentered.
Francesco Turoni - One of the best experts on this subject based on the ideXlab platform.
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online adjustment of furnace exit gas temperature field using advanced infrared pyrometry case study of a 1500 mwth utility boiler
Case Studies in Thermal Engineering, 2020Co-Authors: Julien Blondeau, J Van Den Auweele, S Alimuddin, F Binder, Francesco TuroniAbstract:Abstract The Furnace Exit Gas Temperature (FEGT) is a key parameter of the combustion process in utility boilers that needs to be accurately monitored, especially in order to increase their load- and fuel-flexibility. However, neither the average FEGT nor its spatial distribution over the boiler cross section can be measured using standard equipment. Advanced pyrometry provides an accurate and efficient way to monitor the FEGT: by combining the signals from several Pyrometers installed around the boiler, the FEGT 2D field can be reconstructed. In this paper, we show the results of a measurement campaign carried out on a 1500 MWth boiler using a system comprising 9 infrared Pyrometers. Thanks to online adjustments of the combustion air distribution, the FEGT peak initially observed has been reduced by approximately 100 o C, and the flame has been recentered.
C Vazquez - One of the best experts on this subject based on the ideXlab platform.
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very localized temperature measurements and applications using optical fiber Pyrometers
International Conference on Transparent Optical Networks, 2019Co-Authors: C Vazquez, A Nunez, A Tapetado, H MiguelezAbstract:Recent developments in optical fiber Pyrometers providing high spatial resolution and techniques to avoid noise influence are described in different scenarios. Spot size measurements of 0.16mm and fast response > 1 kHz independent on the setting location of the optical fiber are provided.
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two color pyrometer for process temperature measurement during machining
Journal of Lightwave Technology, 2016Co-Authors: A Tapetado, J Diazalvarez, M H Miguelez, C VazquezAbstract:A fast fiber-optic two-color pyrometer operating on the optical communication bands is designed for temperature measurements in machining processes. Off-the-shelf low-loss fiber-optic demultiplexers and optoelectronics equipment are used in order to obtain a cost-effective sensing solution while reducing both the temperature measurement error and the minimum measurable temperature. The system is capable of measuring highly localized temperatures without using collimation lens. The designed pyrometer allows measuring temperature in the range from 300 to 650 °C, achieving a full-scale temperature error as low as 4%. Factors influencing the temperature measurements are studied in order to identify the sensor limitations, such as a possible damage on the end of the optical fiber, the spectral loss attenuation and responsivity, or the distance between the fiber end and the target. Finally, this pyrometer is applied in a turning process, using a fiber-optic sensor embedded on a standard tool holder. Temperature measurements on the Inconel 718 are reported showing a good agreement with the simulations.
Paul C Ivey - One of the best experts on this subject based on the ideXlab platform.
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An Evaluation of Air-Purging Configurations for Optical Pyrometers in Gas Turbines
Aerosol Science and Technology, 2004Co-Authors: Clive Kerr, Paul C IveyAbstract:Optical Pyrometers that operate in gas turbine aeroengines are exposed to contaminate particulates from the atmosphere of the operating environment, which can deposit on the instrument's lens and thus foul the system's optics. This particle deposition process results in the attenuation of the thermal radiation signal, from the pyrometer's measurement target, due to transmission losses through the layer of deposits on the lens. A purge air system is therefore employed to minimize the level of optical contamination. This article outlines the generic air-purging configurations and highlights their operation through providing both flow field and particle trajectory analyses via computational fluid dynamics (CFD) in order to provide an evaluation of their operating performance.
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optical fouling of the rb199 pyrometer
Journal of Propulsion and Power, 2003Co-Authors: Clive Kerr, Paul C IveyAbstract:The Turbo-Union RB199 aeroengine, which powers the Panavia Tornado aircraft, has two Pyrometers installed to measure and control turbine blade temperature. The utilization of pyrometry and its installation, together with system cone guration, for this in-e ight application are described. The most important issue with pyrometry for in-service use is the deposition of particulates, or optical fouling, of the system’ s lens. The e owe eld and particle trajectories in the RB199 pyrometer purge air design are investigated together with an analysis of the deposits that constitute the fouling of the pyrometer lens. It will be shown that the predominant e ow feature within the purging system is a swirl pattern that develops at the mouth of the still tube. This feature has the ability to draw contaminant particles into the still tube and, thus, signie cantly increase the likelihood of particle deposition onto the lens resulting in optical fouling of the instrument’ s optics.
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A Review of Purge Air Designs for Aeroengine Based Optical Pyrometers
Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls Diagnostics and Instrumentation; Education; IGTI Scholar, 2001Co-Authors: Clive Kerr, Paul C IveyAbstract:With the advent of “power by the hour” type agreements within the civil aeroengine market, the application of engine monitoring system data has reached the level of strategic use for informed decision making in not only the aftermarket but increasingly in the contract negotiation stage. One of the key cost drivers in these dollar-per-hour contracts for the OEMs to analyze is the life and maintenance requirements of the turbine blades leading ultimately to blade life management. Such life management of key components is of critical importance to ensure that the economic and technical risks to both service provider and customer are minimized.The optical pyrometer, through providing a direct temperature measurement of the turbine blades, is a primary input for providing a more realistic assessment of the component’s operating history associated with the use of life usage/remaining algorithms. However, the greatest concern with the in-service use of pyrometry is the issue of fouling since the pyrometer’s lens is exposed to the turbine environment. The level of optical contamination is usually minimized by introducing purge air, bled from the compressor, down the sight tube to prevent both the build-up of contaminants on the exposed system optics and particles in the gas stream from coming in contact with the lens. This paper provides a review of purge air designs and the key methodologies for engine designers to be acquainted with when seeking to integrate the use of optical pyrometry systems in new engine concepts.Copyright © 2001 by ASME
S Alimuddin - One of the best experts on this subject based on the ideXlab platform.
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online adjustment of furnace exit gas temperature field using advanced infrared pyrometry case study of a 1500 mwth utility boiler
Case Studies in Thermal Engineering, 2020Co-Authors: Julien Blondeau, J Van Den Auweele, S Alimuddin, F Binder, Francesco TuroniAbstract:Abstract The Furnace Exit Gas Temperature (FEGT) is a key parameter of the combustion process in utility boilers that needs to be accurately monitored, especially in order to increase their load- and fuel-flexibility. However, neither the average FEGT nor its spatial distribution over the boiler cross section can be measured using standard equipment. Advanced pyrometry provides an accurate and efficient way to monitor the FEGT: by combining the signals from several Pyrometers installed around the boiler, the FEGT 2D field can be reconstructed. In this paper, we show the results of a measurement campaign carried out on a 1500 MWth boiler using a system comprising 9 infrared Pyrometers. Thanks to online adjustments of the combustion air distribution, the FEGT peak initially observed has been reduced by approximately 100 o C, and the flame has been recentered.
