Ash level meter for a fixed-bed coal gasifier
Abstract
An ash level meter for a fixed-bed coal gasifier is provided which utilizes the known ash level temperature profile to monitor the ash bed level. A bed stirrer which travels up and down through the extent of the bed ash level is modified by installing thermocouples to measure the bed temperature as the stirrer travels through the stirring cycle. The temperature measurement signals are transmitted to an electronic signal process system by an FM/FM telemetry system. The processing system uses the temperature signals together with an analog stirrer position signal, taken from a position transducer disposed to measure the stirrer position to compute the vertical location of the ash zone upper boundary. The circuit determines the fraction of each total stirrer cycle time the stirrer-derived bed temperature is below a selected set point, multiplies this fraction by the average stirrer signal level, multiplies this result by an appropriate constant and adds another constant such that a 1 to 5 volt signal from the processor corresponds to a 0 to 30 inch span of the ash upper boundary level. Three individual counters in the processor store clock counts that are representative of: (1) the time the stirrer temperature is below themore »
- Inventors:
-
- Morgantown, WV
- Issue Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
- OSTI Identifier:
- 865138
- Patent Number(s):
- 4466747
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01F - MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- ash; level; meter; fixed-bed; coal; gasifier; provided; utilizes; temperature; profile; monitor; bed; stirrer; travels; extent; modified; installing; thermocouples; measure; stirring; cycle; measurement; signals; transmitted; electronic; signal; process; fm; telemetry; processing; analog; position; transducer; disposed; compute; vertical; location; zone; upper; boundary; circuit; determines; fraction; total; time; stirrer-derived; below; selected; set; multiplies; average; result; appropriate; constant; adds; volt; processor; corresponds; 30; inch; span; individual; counters; store; clock; counts; representative; 500; degree; duration; corresponding; travel; inputs; disconnected; period; stopped; eliminating; corruption; stoppage; signal level; bed temperature; fixed-bed coal; measurement signals; temperature profile; bed level; coal gasifier; coal gas; time duration; ash bed; bed coal; temperature measurement; vertical position; ash level; electronic signal; circuit determines; temperature signal; level meter; position signal; signal process; cycle time; vertical location; measurement signal; temperature measure; bed stirrer; /374/48/73/
Citation Formats
Fasching, George E. Ash level meter for a fixed-bed coal gasifier. United States: N. p., 1984.
Web.
Fasching, George E. Ash level meter for a fixed-bed coal gasifier. United States.
Fasching, George E. Sun .
"Ash level meter for a fixed-bed coal gasifier". United States. https://www.osti.gov/servlets/purl/865138.
@article{osti_865138,
title = {Ash level meter for a fixed-bed coal gasifier},
author = {Fasching, George E},
abstractNote = {An ash level meter for a fixed-bed coal gasifier is provided which utilizes the known ash level temperature profile to monitor the ash bed level. A bed stirrer which travels up and down through the extent of the bed ash level is modified by installing thermocouples to measure the bed temperature as the stirrer travels through the stirring cycle. The temperature measurement signals are transmitted to an electronic signal process system by an FM/FM telemetry system. The processing system uses the temperature signals together with an analog stirrer position signal, taken from a position transducer disposed to measure the stirrer position to compute the vertical location of the ash zone upper boundary. The circuit determines the fraction of each total stirrer cycle time the stirrer-derived bed temperature is below a selected set point, multiplies this fraction by the average stirrer signal level, multiplies this result by an appropriate constant and adds another constant such that a 1 to 5 volt signal from the processor corresponds to a 0 to 30 inch span of the ash upper boundary level. Three individual counters in the processor store clock counts that are representative of: (1) the time the stirrer temperature is below the set point (500.degree. F.), (2) the time duration of the corresponding stirrer travel cycle, and (3) the corresponding average stirrer vertical position. The inputs to all three counters are disconnected during any period that the stirrer is stopped, eliminating corruption of the measurement by stirrer stoppage.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1984},
month = {Sun Jan 01 00:00:00 EST 1984}
}