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

Edward K. Levy | Zendy

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

Author(s) -

Edward K. Levy

Publication year - 2003

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/882403

Subject(s) - fluidization , inlet , coal , pulverized coal fired boiler , air velocity , moisture , environmental science , waste management , fluidized bed , water content , power station , boiler (water heating) , pulp and paper industry , materials science , nuclear engineering , mechanics , engineering , geotechnical engineering , composite material , mechanical engineering , physics , electrical engineering

This is the first 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 and instrumentation being used for the fluidized bed drying experiments. Results of fluidization and drying tests performed with North Dakota lignite, having a 6.35 mm (1/4 inch) top size, are presented. The experiments were performed with a 381 mm (15 inch) settled bed depth, with inlet air and in-bed heater surface temperatures of 44.3 C (110 F), and with the superficial air velocity ranging from 0.2 m/s to 1.4 m/s. Drying rate is shown to be a strong function of air velocity, increasing seven-fold from 0.2 m/s to 1.4 m/s. Increases in velocity from 0.75 m/s (minimum fluidization velocity) to 1.4 m/s resulted in a doubling of the drying rate

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