Slag characterization and removal using pulse detonation for coal gasification. Quarterly research report, July 1--September 31, 1996

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Description

Boiler slagging and fouling as a result of inorganic impurities in combustion gases being deposited on heat transfer tubes have caused severe problems in coal-fired power plant operation. These problems are fuel, system design, and operating condition dependent. Conventional slag and ash removal methods include the use of in situ blowing or jet-type devices such as air or steam soot blowers and water lances. Pulse detonation technology for the purpose of removing slag and fouling deposits in coal-fired utility power plant boilers offers great potential. The detonation wave technique based on high impact velocity with sufficient energy and thermal shock ... continued below

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19 p.

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Huque, Z.; Mei, D.; Biney, P.O.; Zhou, J. & Ali, M.R. October 25, 1996.

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Description

Boiler slagging and fouling as a result of inorganic impurities in combustion gases being deposited on heat transfer tubes have caused severe problems in coal-fired power plant operation. These problems are fuel, system design, and operating condition dependent. Conventional slag and ash removal methods include the use of in situ blowing or jet-type devices such as air or steam soot blowers and water lances. Pulse detonation technology for the purpose of removing slag and fouling deposits in coal-fired utility power plant boilers offers great potential. The detonation wave technique based on high impact velocity with sufficient energy and thermal shock on the slag deposited on gas contact surfaces offers a convenient, inexpensive, yet efficient and effective way to supplement existing slag removal methods. These detonation waves have been demonstrated experimentally to have exceptionally high shearing capability important to the task of removing slag and fouling deposits. Several tests have been performed with single shot detonation wave at University of Texas at Arlington to remove the slag deposit. To hold the slag deposit samples at the exit of detonation tube, two types of fixture was designed and fabricated. They are axial arrangement and triangular arrangement. The slag deposits from the utility boilers have been used to prepare the slag samples for the test. The experimental results show that the single shot detonation wave is capable of removing the entire slag (types of slag deposited on economizer, and air-heater, i.e., relatively softer slags) and 30% of the reheater slag (which is harder) even at a distance of 6 in. from the exit of a detonation engine tube. Wave strength and slag orientation also have different effects on the chipping off of the slag. The annual report discusses about the results obtained in effectively removing the slag.

Physical Description

19 p.

Notes

OSTI as DE98051900

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  • Other Information: PBD: 25 Oct 1996

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  • Other: DE98051900
  • Report No.: DOE/MT/95010--T7
  • Grant Number: FG22-95MT95010
  • DOI: 10.2172/569007 | External Link
  • Office of Scientific & Technical Information Report Number: 569007
  • Archival Resource Key: ark:/67531/metadc699099

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • October 25, 1996

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 10, 2015, 9:31 p.m.

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Huque, Z.; Mei, D.; Biney, P.O.; Zhou, J. & Ali, M.R. Slag characterization and removal using pulse detonation for coal gasification. Quarterly research report, July 1--September 31, 1996, report, October 25, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc699099/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.