Journal ArticleDOI
Particle surface temperature measurements with multicolor band pyrometry
Hong Lu,Leong-Teng Ip,Andrew J. Mackrory,Luke Werrett,Justin Scott,Dale R. Tree,Larry L. Baxter +6 more
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TLDR
In this article, a color-band pyrometer based on widely available, inexpensive digital imaging devices, such as commercial color cameras, and capable of pixel-by-pixel resolution of particle-surface temperature and emissivity is demonstrated and described.Abstract:
A noncontact, color-band pyrometer, based on widely available, inexpensive digital imaging devices, such as commercial color cameras, and capable of pixel-by-pixel resolution of particle-surface temperature and emissivity is demonstrated and described. This diagnostic instrument is ideally suited to many combustion environments. The devices used in this method include color charge-coupled device (CCD), or complementary metal oxide semiconductor (CMOS) digital camera, or any other color-rendering camera. The color camera provides spectrally resolved light intensity data of the image, most commonly for three color bands (Red, Green, and Blue,), but in some cases for four or more bands or for a different set of colors. The CCD or CMOS sensor-mask combination has a specific spectral response curve for each of these color bands that spans the visible and often near infrared spectral range. A theory is developed, based on radiative heat transfer and camera responsivity that allows quantitative surface temperature distribution calculation, based on a photograph of an object in emitted light. Particle surface temperature calculation is corrected by heat transfer analysis with reflection between the particle and reactor wall for particles located in furnace environments, but such corrections lead to useful results only when the particle temperature is near or below the wall temperatures. Wood particle-surface temperatures were measured with this color-band pyrometry during pyrolysis and combustion processes, which agree well with thermocouple measured data. Particle-surface temperature data simultaneously measured from three orthogonal directions were also mapped onto the surface of a computer generated 3-D (three-dimensional) particle model. © 2008 American Institute of Chemical Engineers AIChE J, 2009read more
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Journal ArticleDOI
High-speed digital color imaging pyrometry
TL;DR: A digital high-speed color camera is characterized and calibrated that may be used to measure the temperature of high-explosive and combustion processes and the surface temperature of the resulting fireball was found to rapidly increase after detonation, and subsequently decayed to a constant value of approximately 1980 K.
Journal ArticleDOI
Two-dimensional flame temperature and emissivity measurements of pulverized oxy-coal flames
TL;DR: In this paper, a broadband RGB, two-color pyrometry technique for measuring the flame temperature and total emissivity of a two-dimensional image of a coal flame has been developed and used on an oxy-coal flame.
Journal ArticleDOI
Burnout of pulverized biomass particles in large scale boiler - Single particle model approach
Jaakko Saastamoinen,Martti Aho,Antero Moilanen,Lasse Holst Sørensen,Sønnik Clausen,Mogens Berg +5 more
TL;DR: In this paper, a simplified single particle approach, where the particle combustion model is coupled with one-dimensional equation of motion of the particle, is applied for the calculation of the burnout in the boiler.
Journal ArticleDOI
Characterization on hetero-homogeneous ignition of pulverized coal particle streams using CH∗ chemiluminescence and 3 color pyrometry
TL;DR: In this paper, two in situ optic methods on CH ∗ chemiluminescence and coal particle temperature were applied to investigate the devolatilization/homogeneous and heterogeneous ignition behaviors of dispersed coal particle streams, with ambient temperature from 1200 to 1800 K and oxygen mole fractions from 10% to 30%.
Journal ArticleDOI
A Potential Soot Mass Determination Method from Resistivity Measurement of Thermophoretically Deposited Soot
Azhar Malik,Hussam Abdulhamid,Joakim Pagels,Jenny Rissler,Magnus Lindskog,Patrik Nilsson,Robert B. Bjorklund,Peter Jozsa,Jaco Visser,Anita Lloyd Spetz,Mehri Sanati +10 more
TL;DR: In this article, a soot sensor based on resistivity measurements was developed and characterized, which involved generation of soot particles using a quenched co-flow diffusion flame; depositing the particles onto a sensor substrate using thermophoresis and particle detection using a finger electrode structure, patterned on thermally oxidized silicon substrate.
References
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Journal ArticleDOI
Time-Resolved Temperature Measurements of Individual Coal Particles During Devolatilization
TL;DR: In this article, an in situ method for measuring simultaneously the size, temperature, and velocity of individual coal particles during pyrolysis is presented, and the sensitivity of predicted particle temperature in a rapid heating environment is studied as a function of heat capacity, treatment of local gas temperature and diameter.
Journal ArticleDOI
A system for quantitative imaging diagnostics and its application to pyrometric in-cylinder flame-temperature measurements in large diesel engines
TL;DR: In this article, a double charge-coupled device (CCD) camera system was used to calculate pyrometric diesel flame temperatures based on the blackbody radiation of the soot contained in the flame.
Journal ArticleDOI
Simultaneous in situ measurement of the size, temperature and velocity of particles in a combustion environment
TL;DR: In this paper, an in situ method for measuring simultaneously the size, temperature and velocity of pulverized fuel particles is described, which is limited to applications where the particle size range of primary interest is 10m or larger, and the number density does not exceed 10/sup 4/cm/sup 3/.
Journal ArticleDOI
Simultaneous in situ measurement of temperature and size of burning char particles in a fluidized bed furnace by means of fiberoptic pyrometry
TL;DR: In this article, a pyrometric instrument for the measurement of the temperature of burning fuel particles in fluidized bed furnaces is presented, which is equipped with a fiberoptic probe which is inserted into the bed.
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