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

Patent · Tue Nov 02 00:00:00 EST 1982

OSTI ID:6896758

Raptis, A C; Roach, P D

A method and apparatus for monitoring char flow in a coal gasifier system includes 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.

• Assignee: Dept. of Energy
• Patent Number(s): US 4357603
• OSTI ID: 6896758
• Resource Relation: Patent File Date: Filed date 24 Nov 1980; Other Information: PAT-APPL-209928
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHARS
ACOUSTIC MONITORING
COAL GASIFICATION
FLOW RATE
HIGH PRESSURE
HIGH TEMPERATURE
PIPES
SOLIDS
GASIFICATION
MONITORING
PYROLYSIS PRODUCTS
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification
013000 - Coal
Lignite
& Peat- Transport
Handling
& Storage