Method and apparatus for acoustically monitoring the flow of suspended solid particulate matter

Patent · Fri Jan 01 00:00:00 EST 1982

OSTI ID:864383

Roach, Paul D ^[1]; Raptis, Apostolos C ^[2]

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1. Darien, IL
2. Downers Grove, IL

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/no 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/no 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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by Depart of Energy (Washington, DC)
• Patent Number(s): US 4357603
• OSTI ID: 864383
• Country of Publication: United States
• Language: English

Related Subjects

method
apparatus
acoustically
monitoring
flow
suspended
solid
particulate
matter
char
coal
gasifier
monitor
circuits
measure
acoustic
attenuation
caused
presence
line
provide
indication
relative
density
compute
ratio
signals
frequency
bands
band
representative
background
noise
attenuated
contains
frequencies
selected
monotonically
related
particle
concentration
providing
quantitative
solid particulate
coal gasifier
particulate matter
coal gas
particle concentration
background noise
flow monitor
frequency band
quantitative measure
flow indication
suspended solid
frequency bands
monitoring char
acoustic attenuation
attenuation caused
/340/73/