Determining inert content in coal dust/rock dust mixture
Abstract
A method and apparatus for determining the inert content of a coal dust and rock dust mixture uses a transparent window pressed against the mixture. An infrared light beam is directed through the window such that a portion of the infrared light beam is reflected from the mixture. The concentration of the reflected light is detected and a signal indicative of the reflected light is generated. A normalized value for the generated signal is determined according to the relationship .phi.=(log i.sub.c `log i.sub.co) / (log i.sub.c100 -log i.sub.co) where i.sub.co =measured signal at 0% rock dust i.sub.c100 =measured signal at 100% rock dust i.sub.c =measured signal of the mixture. This normalized value is then correlated to a predetermined relationship of .phi. to rock dust percentage to determine the rock dust content of the mixture. The rock dust content is displayed where the percentage is between 30 and 100%, and an indication of out-of-range is displayed where the rock dust percent is less than 30%. Preferably, the rock dust percentage (RD%) is calculated from the predetermined relationship RD%=100+30 log .phi.. where the dust mixture initially includes moisture, the dust mixture is dried before measuring by use of 8 to 12 meshmore »
- Inventors:
-
- Finleyville, PA
- (Oakmont, PA)
- Issue Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
- OSTI Identifier:
- 866828
- Patent Number(s):
- 4799799
- Assignee:
- United States of America as represented by Secretary of (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- determining; inert; content; coal; dust; rock; mixture; method; apparatus; transparent; window; pressed; infrared; light; beam; directed; portion; reflected; concentration; detected; signal; indicative; generated; normalized; value; determined; according; relationship; phi; log; c100; -log; measured; 100; correlated; predetermined; percentage; determine; displayed; 30; indication; out-of-range; percent; preferably; calculated; initially; moisture; dried; measuring; 12; mesh; molecular-sieves; shaken; subsequently; screened; measured signal; transparent window; generated signal; dust mixture; infrared light; rock dust; light beam; reflected light; signal indicative; coal dust; inert content; /356/250/
Citation Formats
Sapko, Michael J, and Ward, Jr., Jack A. Determining inert content in coal dust/rock dust mixture. United States: N. p., 1989.
Web.
Sapko, Michael J, & Ward, Jr., Jack A. Determining inert content in coal dust/rock dust mixture. United States.
Sapko, Michael J, and Ward, Jr., Jack A. Sun .
"Determining inert content in coal dust/rock dust mixture". United States. https://www.osti.gov/servlets/purl/866828.
@article{osti_866828,
title = {Determining inert content in coal dust/rock dust mixture},
author = {Sapko, Michael J and Ward, Jr., Jack A.},
abstractNote = {A method and apparatus for determining the inert content of a coal dust and rock dust mixture uses a transparent window pressed against the mixture. An infrared light beam is directed through the window such that a portion of the infrared light beam is reflected from the mixture. The concentration of the reflected light is detected and a signal indicative of the reflected light is generated. A normalized value for the generated signal is determined according to the relationship .phi.=(log i.sub.c `log i.sub.co) / (log i.sub.c100 -log i.sub.co) where i.sub.co =measured signal at 0% rock dust i.sub.c100 =measured signal at 100% rock dust i.sub.c =measured signal of the mixture. This normalized value is then correlated to a predetermined relationship of .phi. to rock dust percentage to determine the rock dust content of the mixture. The rock dust content is displayed where the percentage is between 30 and 100%, and an indication of out-of-range is displayed where the rock dust percent is less than 30%. Preferably, the rock dust percentage (RD%) is calculated from the predetermined relationship RD%=100+30 log .phi.. where the dust mixture initially includes moisture, the dust mixture is dried before measuring by use of 8 to 12 mesh molecular-sieves which are shaken with the dust mixture and subsequently screened from the dust mixture.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1989},
month = {Sun Jan 01 00:00:00 EST 1989}
}