In-Situ Measurement Of Lime Kiln Burden Temperature By Laser Induced Fluorescence

Peter C. Ariessohn; Kelle R. Ryan

doi:10.1117/12.949339

10 March 1989 In-Situ Measurement Of Lime Kiln Burden Temperature By Laser Induced Fluorescence

Peter C. Ariessohn, Kelle R. Ryan

Author Affiliations +

Proceedings Volume 1012, In-Process Optical Measurements; (1989) https://doi.org/10.1117/12.949339
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

A novel technique has been developed for measuring the temperature of the burden inside an operating industrial lime kiln. In this technique, trace quantities of a rare earth element are introduced into the input stream to the kiln. Conditions inside the kiln cause the rare earth ions to become incorporated as substitutional impurities in the crystal lattice of the calcium oxide product. This results in a product which exhibits strong fluorescence under ultra-violet excitation. The decay time constant of this fluorescence, which is strongly temperature dependent, serves as a measure of burden temperature. The spectral and temporal characteristics of the fluorescence of several rare earths have been studied over a temperature range of 800 to 1150°C which is the range of interest in an operating kiln. This work has led to the selection of praseodymium as the most suitable rare earth element and to the development of techniques to permit temperature measurements with an accuracy of approximately ±20°C to be performed at rare earth concentrations in the parts per million range. A prototype sensor employing this fluorescence technique has been developed. This sensor, which has been designed to survive in the harsh lime kiln environment, utilizes a frequency tripled Nd:YAG laser to provide high energy UV pulses at 355 nm and a specially designed telescope and fiber-optic light collection system to detect the emitted fluorescence. This device will provide the first accurate, in-situ measurement of lime kiln burden temperature which can be made on a continuous basis.

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Peter C. Ariessohn and Kelle R. Ryan "In-Situ Measurement Of Lime Kiln Burden Temperature By Laser Induced Fluorescence", Proc. SPIE 1012, In-Process Optical Measurements, (10 March 1989); https://doi.org/10.1117/12.949339

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KEYWORDS

Luminescence

Temperature metrology

Telescopes

Sensors

Mirrors

Calcium

Optical testing

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