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Title: Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, October 1, 1996--December 31, 1996

Abstract

The key issues addressed this quarter were related to operational problems in the coal feed system, namely, the inability to accurately measure all of air entering the system, and plugging of coal in the feed lines due to poor entrainment. Both of these problems caused unacceptable uncertainty and/or fluctuations in the operating conditions and therefore required solutions. The coal entrainment problem was solved by installing a new educator designed for entraining solids in gas streams. All of the air entering the reactor now flows through the educator, either as motive air or through the suction air inlet. This ensures that the coal is entrained at relatively high velocity, so that it will flow to the reactor without forming slugs in the lines. A new feeder shroud was also installed with an air jet directed towards the auger to sweep off the tip in order to reduce pulsations when feeding coal. The problems associated with accurately metering the air have been somewhat more difficult to resolve. New strategies for completely closing the system have been tested and look promising. A new flowmeter was also purchased with cost sharing funds to directly measure the air flow rate of the two phase streammore » (after the coal injection point). If the system can be operated without leaks, then the changes will provide two independent measurements of the air flow to ensure accuracy. If the system cannot be sealed, the new flowmeter will still provide reliable measurement of the air flow and permit proper operation of the combustor. Consequently, we feel that the problems have been resolved and we look forward to a productive next quarter.« less

Authors:
Publication Date:
Research Org.:
Brigham Young Univ., Provo, UT (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
OSTI Identifier:
481904
Report Number(s):
DOE/PC/93226-T13
ON: DE97052474; TRN: 97:003689
DOE Contract Number:  
FG22-93PC93226
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 13 Feb 1997
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; STAGED COMBUSTION; ASHES; DEPOSITION; PROGRESS REPORT; AIR FLOW; COST; PULSATIONS; VELOCITY; MINERALS

Citation Formats

Harb, J N. Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, October 1, 1996--December 31, 1996. United States: N. p., 1997. Web. doi:10.2172/481904.
Harb, J N. Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, October 1, 1996--December 31, 1996. United States. https://doi.org/10.2172/481904
Harb, J N. 1997. "Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, October 1, 1996--December 31, 1996". United States. https://doi.org/10.2172/481904. https://www.osti.gov/servlets/purl/481904.
@article{osti_481904,
title = {Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, October 1, 1996--December 31, 1996},
author = {Harb, J N},
abstractNote = {The key issues addressed this quarter were related to operational problems in the coal feed system, namely, the inability to accurately measure all of air entering the system, and plugging of coal in the feed lines due to poor entrainment. Both of these problems caused unacceptable uncertainty and/or fluctuations in the operating conditions and therefore required solutions. The coal entrainment problem was solved by installing a new educator designed for entraining solids in gas streams. All of the air entering the reactor now flows through the educator, either as motive air or through the suction air inlet. This ensures that the coal is entrained at relatively high velocity, so that it will flow to the reactor without forming slugs in the lines. A new feeder shroud was also installed with an air jet directed towards the auger to sweep off the tip in order to reduce pulsations when feeding coal. The problems associated with accurately metering the air have been somewhat more difficult to resolve. New strategies for completely closing the system have been tested and look promising. A new flowmeter was also purchased with cost sharing funds to directly measure the air flow rate of the two phase stream (after the coal injection point). If the system can be operated without leaks, then the changes will provide two independent measurements of the air flow to ensure accuracy. If the system cannot be sealed, the new flowmeter will still provide reliable measurement of the air flow and permit proper operation of the combustor. Consequently, we feel that the problems have been resolved and we look forward to a productive next quarter.},
doi = {10.2172/481904},
url = {https://www.osti.gov/biblio/481904}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 13 00:00:00 EST 1997},
month = {Thu Feb 13 00:00:00 EST 1997}
}