Measurement of electrical resistivity of particulate...

Details Measurement of electrical resistivity of particulate... Measurement of electrical resistivity of particulate...

G - Physics

01

N

324/45

G01N 27/04 (2006.01) G01N 27/07 (2006.01)

Patent

CA 2018083

MEASUREMENT OF ELECTRICAL RESISTIVITY OF PARTICULATE ENTRAINED IN A GAS STREAM ABSTRACT OF THE DISCLOSURE The resistivity of particulate matter in a gas stream, such as a combustion gas stream produced in a coal-fired power plant, is measured by collecting a sample of the particulate on the surface of a porous ceramic cylinder, either with or without an applied collection voltage, and then determining the resistance of the sample with a compound measurement electrode having multiple conductors. The reference electrode and the measurement electrode are spirally wound on the ceramic cylinder in an interdigitated manner, so that the two are laterally adjacent down the length of the cylinder. The pressure within the cylinder is controllable, with a pressure below atmospheric being applied to draw the particulate to the surface and ascertain when a sufficient sample for measurement is present, and a pressure above atmospheric being applied to blow away the sample after the measurement is completed, thereby preparing the instrument for the taking of another sample.

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