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

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This is the seventh 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. Coal drying experiments were performed with lignite and Powder River Basin coals to determine the effects of inlet air moisture level on the equilibrium relationship between coal moisture and exit air relative humidity and temperature. The results show that, for lignite, there is a slight dependence of equilibrium moisture on inlet humidity level. However, the equilibrium relationship for PRB coal appears to be independent of inlet ... continued below

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36 pages

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Levy, Edward K.; Sarunac, Nenad & Zhang, Wei October 1, 2004.

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Description

This is the seventh 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. Coal drying experiments were performed with lignite and Powder River Basin coals to determine the effects of inlet air moisture level on the equilibrium relationship between coal moisture and exit air relative humidity and temperature. The results show that, for lignite, there is a slight dependence of equilibrium moisture on inlet humidity level. However, the equilibrium relationship for PRB coal appears to be independent of inlet air humidity level. The specific equilibrium model used for computing lignite coal dryer performance has a significant effect on the prediction accuracy for exit air relative humidity; but its effects on predicted coal product moisture, exit air temperature and specific humidity are minimal. Analyses were performed to determine the effect of lignite product moisture on unit performance for a high temperature drying system. With this process design, energy for drying is obtained from the hot flue gas entering the air preheater and the hot circulating cooling water leaving the steam condenser. Comparisons were made to the same boiler operating with lignite which had been dried off-site.

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36 pages

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OSTI as DE00835590

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  • Other Information: PBD: 1 Oct 2004

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  • Report No.: NONE
  • Grant Number: FC26-03NT41729
  • DOI: 10.2172/835590 | External Link
  • Office of Scientific & Technical Information Report Number: 835590
  • Archival Resource Key: ark:/67531/metadc785746

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Office of Scientific & Technical Information Technical Reports

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  • October 1, 2004

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  • 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.; Sarunac, Nenad & Zhang, Wei. USE OF COAL DRYING TO REDUCE WATER CONSUMED IN PULVERIZED COAL POWER PLANTS, report, October 1, 2004; United States. (digital.library.unt.edu/ark:/67531/metadc785746/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.