Method and apparatus for the combined use of dual density...

Details Method and apparatus for the combined use of dual density... Method and apparatus for the combined use of dual density...

G - Physics

01

F

354/31

G01F 1/76 (2006.01) G01F 1/74 (2006.01) G01F 1/86 (2006.01) G01N 9/24 (2006.01)

Patent

CA 2040944

The suspension density of a pneumatically transported solid, such as coal, is obtained by using a combination of a radial gamma ray densitometer and a second, fast-response density metre. The combination is required to get the desired combination of accuracy and response time. The second measurement is used for its fast response time and may be used to control operating conditions of a gasifier. The slower, but more accurate, radial radiation measurement is used to recalibrate the second measurement approximately every 10 seconds and correct for drift thereof. The drift in the second measurement is sufficiently slow that high accuracy can be maintained by the recalibration technique.

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