Effect of fuel properties on the bottom ash generation rate by a laboratory fluidized bed combustor

Rozelle, P L; Pisupati, S V; Scaroni, A W

doi:10.1115/1.2719205

Title: Effect of fuel properties on the bottom ash generation rate by a laboratory fluidized bed combustor

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Abstract

The range of fuels that can be accommodated by an FBC boiler system is affected by the ability of the fuel, sorbent, and ash-handling equipment to move the required solids through the boiler. Of specific interest is the bottom ash handling equipment, which must have sufficient capacity to remove ash from the system in order to maintain a constant bed inventory level, and must have sufficient capability to cool the ash well below the bed temperature. Quantification of a fuel's bottom ash removal requirements can be useful for plant design. The effect of fuel properties on the rate of bottom ash production in a laboratory FBC test system was examined. The work used coal products ranging in ash content from 20 to 40+ wt. %. The system's classification of solids by particle size into flyash and bottom ash was characterized using a partition curve. Fuel fractions in the size range characteristic of bottom ash were further analyzed for distributions of ash content with respect to specific gravity, using float sink tests. The fuel fractions were then ashed in a fixed bed. In each case, the highest ash content fraction produced ash with the coarsest size consist (characteristic of bottom ash).more »« less

Authors:

Rozelle, P L; Pisupati, S V; Scaroni, A W ^[1]

Penn State University, University Park, PA (United States). Dept. of Energy & Geoenvironmental Engineering

Publication Date:: Fri Jun 15 00:00:00 EDT 2007

OSTI Identifier:: 20939514

Resource Type:: Journal Article

Journal Name:: Journal of Energy Resources Technology

Additional Journal Information:: Journal Volume: 129; Journal Issue: 2; Journal ID: ISSN 0195-0738

Country of Publication:: United States

Language:: English

Subject:: 01 COAL, LIGNITE, AND PEAT; FLUIDIZED-BED COMBUSTORS; ASHES; MATERIALS HANDLING; FLY ASH; PARTICLE SIZE; ASH CONTENT; BENCH-SCALE EXPERIMENTS

Citation Formats


                    Rozelle, P L, Pisupati, S V, and Scaroni, A W. Effect of fuel properties on the bottom ash generation rate by a laboratory fluidized bed combustor.  United States: N. p., 2007. 
        Web.  doi:10.1115/1.2719205.

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                    Rozelle, P L, Pisupati, S V, & Scaroni, A W. Effect of fuel properties on the bottom ash generation rate by a laboratory fluidized bed combustor.  United States.  https://doi.org/10.1115/1.2719205

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                    Rozelle, P L, Pisupati, S V, and Scaroni, A W. 2007.  
        "Effect of fuel properties on the bottom ash generation rate by a laboratory fluidized bed combustor".  United States.  https://doi.org/10.1115/1.2719205.

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@article{osti_20939514,

  title        = {Effect of fuel properties on the bottom ash generation rate by a laboratory fluidized bed combustor},

  author       = {Rozelle, P L and Pisupati, S V and Scaroni, A W},

  abstractNote = {The range of fuels that can be accommodated by an FBC boiler system is affected by the ability of the fuel, sorbent, and ash-handling equipment to move the required solids through the boiler. Of specific interest is the bottom ash handling equipment, which must have sufficient capacity to remove ash from the system in order to maintain a constant bed inventory level, and must have sufficient capability to cool the ash well below the bed temperature. Quantification of a fuel's bottom ash removal requirements can be useful for plant design. The effect of fuel properties on the rate of bottom ash production in a laboratory FBC test system was examined. The work used coal products ranging in ash content from 20 to 40+ wt. %. The system's classification of solids by particle size into flyash and bottom ash was characterized using a partition curve. Fuel fractions in the size range characteristic of bottom ash were further analyzed for distributions of ash content with respect to specific gravity, using float sink tests. The fuel fractions were then ashed in a fixed bed. In each case, the highest ash content fraction produced ash with the coarsest size consist (characteristic of bottom ash). The lower ash content fractions were found to produce ash in the size range characteristic of flyash, suggesting that the high ash content fractions were largely responsible for the production of bottom ash. The contributions of the specific gravity fractions to the composite ash in the fuels were quantified. The fuels were fired in the laboratory test system. Fuels with higher amounts of high specific gravity particles, in the size ranges characteristic of bottom ash, were found to produce more bottom ash, indicating the potential utility of float sink methods in the prediction of bottom ash removal requirements.},

  doi          = {10.1115/1.2719205},

  url          = {https://www.osti.gov/biblio/20939514},
  journal      = {Journal of Energy Resources Technology},

  issn         = {0195-0738},

  number       = 2,

  volume       = 129,

  place        = {United States},

  year         = {Fri Jun 15 00:00:00 EDT 2007},

  month        = {Fri Jun 15 00:00:00 EDT 2007}

}

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