Measurement of electrical resistivity of particulate entrained i

Details Measurement of electrical resistivity of particulate entrained i Measurement of electrical resistivity of particulate entrained i

1989-06-05

1991-04-16

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324715, 324716, 324724, 324464, 304627, 73 2801, G01R 2702

Patent

active

050086286

ABSTRACT:
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 suface 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.

REFERENCES:
patent: 3515987 (1970-06-01), Zurbrick et al.
patent: 3686926 (1972-08-01), Miller et al.
patent: 4656832 (1987-04-01), Yukihisa et al.
Grady B. Nichols, "Techniques for Measuring Fly Ash Resistivity", Enviromental Protection Agency Publication EPA-650/2-74-079, pp. 1-41 (Aug. 1974).

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