Measurement and control of electrostatic charges on solids in a gaseous suspension. Technical progress report No. 5

Technical Report · Tue Oct 01 00:00:00 EDT 1985

OSTI ID:6362672

Nieh, S; Nguyen, T

Measurements of mean particle charges and charge distributions on Medium Volatile Bituminous (MVB) coals and Lignite A (LIGA) coals in a 51 mm ID grounded copper pipe loop have been made with the upgraded Faraday cage system. Both negative and positive charges were found for coals in all experiments. The dual polarities of charges are believed to be due to the nonuniform materials and chemical composition contained in coals. As expected, increasing velocity or decreasing air humidity has a significant effect to increase the mean particle charge and the standard deviation of distribution. Charge elimination by the addition of coal fines has been explored. Effective suppression of particle charges was achieved by adding 0.1% by mass of minus 1 ..mu..m coal dust into the pipe flow. A neutralization mechanism was proposed to interpret the measured results. The results of charge control obtained to date has been significant and encouraging. More work is needed to validate the proposed mechanism. 16 refs., 9 figs., 5 tabs.

• Research Organization: Catholic Univ. of America, Washington, DC. Dept. of Mechanical Engineering
• DOE Contract Number: FG22-84PC70778
• OSTI ID: 6362672
• Report Number(s): DOE/PC/70778-T5; ON: DE86003037
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
BITUMINOUS COAL
ELECTROSTATICS
PNEUMATIC TRANSPORT
LIGNITE
CHARGE DISTRIBUTION
ELECTRIC CHARGES
PIPELINES
PIPES
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
COAL
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
TRANSPORT
010600* - Coal
Lignite
& Peat- Properties & Composition
013000 - Coal
Lignite
& Peat- Transport
Handling
& Storage