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

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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 ... continued below

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12 p.

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Harb, J.N. February 13, 1997.

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Description

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.

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12 p.

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OSTI as DE97052474

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  • Other Information: PBD: 13 Feb 1997

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  • Other: DE97052474
  • Report No.: DOE/PC/93226--T13
  • Grant Number: FG22-93PC93226
  • DOI: 10.2172/481904 | External Link
  • Office of Scientific & Technical Information Report Number: 481904
  • Archival Resource Key: ark:/67531/metadc675291

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  • February 13, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Nov. 10, 2015, 7:56 p.m.

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Harb, J.N. Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, October 1, 1996--December 31, 1996, report, February 13, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc675291/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.