USE OF COAL DRYING TO REDUCE WATER CONSUMED IN PULVERIZED COAL POWER PLANTS

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This is the fourth Quarterly Report for this project. The background and technical justification for the project are described, including potential benefits of reducing fuel moisture, prior to firing in a pulverized coal boiler. A description is given of the equipment, instrumentation and procedures being used for the fluidized bed drying experiments. Experimental data were obtained during this last quarter on the effects of particle size on drying rate for a North Dakota lignite. Other experiments looked at drying a PRB coal. The tests comparing drying rates with lignite particles of different diameters were carried out with particle top sizes ... continued below

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34 pages

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Levy, Edward K.; Caram, Hugo; Yao, Zheng & Feng, Gu January 1, 2004.

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Description

This is the fourth Quarterly Report for this project. The background and technical justification for the project are described, including potential benefits of reducing fuel moisture, prior to firing in a pulverized coal boiler. A description is given of the equipment, instrumentation and procedures being used for the fluidized bed drying experiments. Experimental data were obtained during this last quarter on the effects of particle size on drying rate for a North Dakota lignite. Other experiments looked at drying a PRB coal. The tests comparing drying rates with lignite particles of different diameters were carried out with particle top sizes from 2 to 9.5 mm and covered a range of air velocities. The results show that drying rate increased with air velocity, but that, within the accuracy of the data, the data for all four particle size distributions follow the same curve. This suggests the higher drying rates associated with the larger particles are due to higher air velocities and not to any inherently different drying rates due to particle size. The drying data with the PRB coal show qualitatively similar behavior to that observed with lignite. However, quantitative comparisons of the drying rate data obtained so far for the two coals show the PRB dried at rates which were 14 to 20 percent lower than the lignite, for comparable process conditions. The equilibrium relationship between relative humidity and coal moisture was refined using a correction for temperature. This reduced the scatter in the coal moisture versus relative humidity data and improved the predictions made with the first principle drying model.

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34 pages

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OSTI as DE00823023

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  • Other Information: PBD: 1 Jan 2004

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  • Report No.: NONE
  • Grant Number: FC26-03NT41729
  • DOI: 10.2172/823023 | External Link
  • Office of Scientific & Technical Information Report Number: 823023
  • Archival Resource Key: ark:/67531/metadc782840

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 2004

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 3, 2017, 1:38 p.m.

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Levy, Edward K.; Caram, Hugo; Yao, Zheng & Feng, Gu. USE OF COAL DRYING TO REDUCE WATER CONSUMED IN PULVERIZED COAL POWER PLANTS, report, January 1, 2004; United States. (digital.library.unt.edu/ark:/67531/metadc782840/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.