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The basic study of the kinetics of black liquor gasification

The basic study of the kinetics of black liquor gasification. Joko Wintoko Department of Forest Product and Chemical Engineering Chalmers University of Technology. Schematic of a BLG process. The aim. To study the kinetics of black liquor gasification. Gasification/combustion process.

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The basic study of the kinetics of black liquor gasification

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  1. The basic study of the kinetics of black liquor gasification Joko Wintoko Department of Forest Product and Chemical Engineering Chalmers University of Technology

  2. Schematic of a BLG process

  3. The aim • To study the kinetics of black liquor gasification

  4. Gasification/combustion process Ref: Verril & Wessel (1995)

  5. Plan of the research • Literature review (ongoing) • Construction of equipment (soon finish) • Mathematical modeling (ongoing) • Experimental work (expected start in this spring)

  6. Literature review Focusing on: • Phenomena occurs during the black liquor combustion/gasification • Mathematical models

  7. Literature review • Former model: • Jim Frederick • Verrill & Wessel • Saastamoinen Forward

  8. Modeling by Jim Frederick • Aim: to develop computational model for predicting the combustion times for black liquor droplets in a recovery furnace environment • The controlling resistance is identified by calculating Biot number for heat transfer and mass transfer. Back

  9. Modeling by Verrill & Wessel • Application of modeling result to study the laboratory data: • sodium loss during black liquor drying and devolatilization • Amount and composition of fume • The vapor/gas flow inside the droplet is modeled as flow of fluids through porous media. Back

  10. Modeling by Saastamoinen • Aim: calculating the drying, devolatilization and swelling of a black liquor droplet • The drying, devolatilization, and swelling is modeled as a subsequent process locally. However inside the droplet those two process take place simultaneously. Back

  11. Literature review • Kinetics data: • Gasification with CO2 • Gasification with steam

  12. Literature review • Swelling no kinetics • Kinetics no swelling • Only one studying kinetics + swelling

  13. Gasification/combustion process Ref: Verril & Wessel (1995)

  14. water evaporation black liquor droplet nitrogen gas flow Modeling Drying Assumptions: • Water evaporation takes place only on the droplet surface. • Heat transfer inside the droplet is only due to conduction. • Mass transfer inside the droplet is only due to diffusion

  15. Modeling • Result of modeling & comparing with the data from literature

  16. Equipment Data logger for temperature measurement H2S analyzer Power regulator Balance Gas cooler CO2 & CO Analyzer N2 purging Video camera FC CH4 & SO2 Analyzer FURNACE Gas

  17. Equipment (under construction)

  18. Summary • BLG kinetics study • Modeling in FEMLAB • Drying • Equipment is finished soon • Experimental work latter in this spring

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