Method and apparatus for acoustically monitoring the flow of sus

Details Method and apparatus for acoustically monitoring the flow of sus Method and apparatus for acoustically monitoring the flow of sus

1980-11-24

1982-11-02

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

340608, 7386121, G08B 2100

Patent

active

043576036

ABSTRACT:
A method and apparatus for monitoring char flow in a coal gasifier system cludes flow monitor circuits which measure acoustic attenuation caused by the presence of char in a char line and provide a char flow
o flow indication and an indication of relative char density. The flow monitor circuits compute the ratio of signals in two frequency bands, a first frequency band representative of background noise, and a second higher frequency band in which background noise is attenuated by the presence of char. Since the second frequency band contains higher frequencies, the ratio can be used to provide a flow
o flow indication. The second band can also be selected so that attenuation is monotonically related to particle concentration, providing a quantitative measure of char concentration.

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patent: 4152928 (1979-05-01), Roberts

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