Role of C-CO/sub 2/ in gasification of coal and char. Final report, 15 August 1978-15 November 1981

Sears, J T; Wen, C Y

Title: Role of C-CO/sub 2/ in gasification of coal and char. Final report, 15 August 1978-15 November 1981

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Abstract

The objectives of the project were to investigate coal-char gasification reactions with CO/sub 2/, H/sub 2/O and other gases, to examine fluid dynamics of char present in a fluidized bed, and to develop a computer model of the fluid-bed gasification which can incorporate such information. To these ends a unique high pressure/temperature thermogravimetric analysis instrument, a pressurized 30 cm-dia. fluid bed, and a high-temperature 13 cm fluid bed were constructed. Coal pyrolysis and char reactions were examined at temperatures to 1600/sup 0/C and pressure to 28 atm. Extent of pyrolysis was shown to depend on particle size and pressure, and in three stages on temperature. Char properties were determined, including diffusion coefficients of CO/sub 2/ in char and surface areas. Char reactivity does not strongly depend on pressure in the range 1 to 28 atm. Diffusion limits are strongly present above 1000/sup 0/C. Inhibition by CO and H/sub 2/ increase rapidly with pressure. Elutriation of particles in a hot bed can be determined from low-temperature results if compared at the same value of excess fluid velocity above minimum fluidization. Bubble size and numbers change slightly with pressure. Fluid bed gasificaton can be modeled successfully, and a basic model is presentedmore » here.« less

Authors:: Sears, J T; Wen, C Y

Publication Date:: Thu Jan 01 00:00:00 EST 1981

Research Org.:: West Virginia Univ., Morgantown (USA). Dept. of Chemical Engineering

OSTI Identifier:: 5010900

Report Number(s):: DOE/ET/11338-1216
ON: DE82016392

DOE Contract Number:: AC21-78ET11338

Resource Type:: Technical Report

Country of Publication:: United States

Language:: English

Subject:: 01 COAL, LIGNITE, AND PEAT; CHARS; GASIFICATION; THERMAL GRAVIMETRIC ANALYSIS; COAL GASIFICATION; CHEMICAL REACTIONS; BUBBLES; CARBON DIOXIDE; CHEMICAL REACTION KINETICS; ELUTRIATION; EXPERIMENTAL DATA; FLUIDIZED BED; MATHEMATICAL MODELS; PYROLYSIS; STEAM; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL ANALYSIS; DATA; DECOMPOSITION; GRAVIMETRIC ANALYSIS; INFORMATION; KINETICS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; PYROLYSIS PRODUCTS; QUANTITATIVE CHEMICAL ANALYSIS; REACTION KINETICS; SEPARATION PROCESSES; THERMAL ANALYSIS; THERMOCHEMICAL PROCESSES; 010404* - Coal, Lignite, & Peat- Gasification

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                    Sears, J T, and Wen, C Y. Role of C-CO/sub 2/ in gasification of coal and char. Final report, 15 August 1978-15 November 1981.  United States: N. p., 1981. 
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                    Sears, J T, & Wen, C Y. Role of C-CO/sub 2/ in gasification of coal and char. Final report, 15 August 1978-15 November 1981.  United States.

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                    Sears, J T, and Wen, C Y. 1981.  
        "Role of C-CO/sub 2/ in gasification of coal and char. Final report, 15 August 1978-15 November 1981".  United States.

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@article{osti_5010900,

  title        = {Role of C-CO/sub 2/ in gasification of coal and char. Final report, 15 August 1978-15 November 1981},

  author       = {Sears, J T and Wen, C Y},

  abstractNote = {The objectives of the project were to investigate coal-char gasification reactions with CO/sub 2/, H/sub 2/O and other gases, to examine fluid dynamics of char present in a fluidized bed, and to develop a computer model of the fluid-bed gasification which can incorporate such information. To these ends a unique high pressure/temperature thermogravimetric analysis instrument, a pressurized 30 cm-dia. fluid bed, and a high-temperature 13 cm fluid bed were constructed. Coal pyrolysis and char reactions were examined at temperatures to 1600/sup 0/C and pressure to 28 atm. Extent of pyrolysis was shown to depend on particle size and pressure, and in three stages on temperature. Char properties were determined, including diffusion coefficients of CO/sub 2/ in char and surface areas. Char reactivity does not strongly depend on pressure in the range 1 to 28 atm. Diffusion limits are strongly present above 1000/sup 0/C. Inhibition by CO and H/sub 2/ increase rapidly with pressure. Elutriation of particles in a hot bed can be determined from low-temperature results if compared at the same value of excess fluid velocity above minimum fluidization. Bubble size and numbers change slightly with pressure. Fluid bed gasificaton can be modeled successfully, and a basic model is presented here.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/5010900},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Thu Jan 01 00:00:00 EST 1981},

  month        = {Thu Jan 01 00:00:00 EST 1981}

}

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