In situ multi-channel combustion gas analyzer

Details In situ multi-channel combustion gas analyzer In situ multi-channel combustion gas analyzer

G - Physics

01

N

73/59

G01N 21/35 (2006.01) G01N 21/31 (2006.01) G01N 21/53 (2006.01) G01N 21/85 (2006.01)

Patent

CA 1218868

Abstract Apparatus is disclosed to accurately measure and analyze multiple component interfering gases which coexist in the stack gas effluent generated from a combustion process which utilizes a non-dispersive, narrowband infrared absorption technique. The apparatus includes a probe in the stack with an optical measurement cavity (34) through which the stack gases are passed. A transceiver (14) mounted to the probe includes an optical portion operatively associated with the measurement cavity including a chopped light source (54), (60), (62) for projecting beams of light into the measurement cavity and a detector (86) for detecting the attenuation of the gases to provide a measure of the extent of absorption of each gas of in- terest. A control unit, preferably remote from the trans- ceiver, preferably a programmed digital computer, and preferably via a J-box (18) converts the electric outputs to a corresponding % modulation and in turn corrects for temperature, pressure and interference between gases. The results may be displayed on a front panel (174) or used, for example, to maximize efficiency in a combustion process.

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