lindstrom exam.ppt

lindstrom exam.ppt - E.V. Mathias Lindst rö m Final Exam...

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Unformatted text preview: E.V. Mathias Lindst rö m Final Exam WOOD AND PAPER SCIENCE WOOD AND PAPER SCIENCE NC STATE UNIVERSITY NC STATE UNIVERSITY INTEGRATING BLACK LIQUOR GASIFICATION WITH PULPING PROCESS SIMULATION, ECONOMICS AND POTENTIAL BENEFITS Presentation Topics • Introduction Project Objective Modified pulping technologies (MPT) Black liquor gasification (BLG) • Methods and Results Laboratory pulping work Simulation work using WinGEMS • Conclusions Players and the Technology Gaps Globally: • Industry and Governments in Scandinavia and North America Domestically: Technology gaps identified by industry NCSU D.C. Cicero, DOE – NETL “U.S. Department of Energy’s involvement with Gasification” Colloquium on Black Liquor Combustion and Gasification, May 13, 2003 Project Objective Explore the effects of black liquor gasification (BLG) implementation on chemical pulping • Laboratory pulping Investigation of BLG enabled modified pulping technologies in terms of pulp yield and properties • Process simulation Evaluate effects of modified pulping technologies on pulping process unit operations, process variables and economics • Kraft Mill Net user of Energy Producer of wood pulp and some value added products • Biorefinery Producer of Energy Producer of value added products and wood pulp (?) A Pulping Vision D.C. Cicero, DOE – NETL “U.S. Department of Energy’s involvement with Gasification” Colloquium on Black Liquor Combustion and Gasification, May 13, 2003 Pulping Chemistry and Recovery 101 NaOH + Na 2 S + Wood Na 2 CO 3 + Na 2 S + Wood Pulp Na 2 CO 3 + Ca(OH) 2 = 2 NaOH + CaCO 3 Wood Pulp 3) Washing 2) Pulping 4) Concentration 5) Combustion Time Energy Black Liquor White Liquor Chemical Make-up 1) Impregnation 6) Recaustization Green Liquor Green Liquor The Tomlinson Recovery Boiler • Low thermal efficiency • Low power to heat ratio • Potential for smelt/water explosions • Smelt S/Na ratio = black liquor Smelt S/Na ratio = black liquor S/Na ratio S/Na ratio Black Liquor Gasification Effective separation of inorganic pulping chemicals high sodium/low sulfur stream low sodium/high sulfur stream Fluidizing Steam Bed Solids Product Gas Clean Flue Gas Feedstock Pulsed Heaters Product Gas/Air • Low Temperature Schematic of a MTCI Steam Reformer 8 Modified Delignification • Achieve high HS-- concentration in the initial phases of the cook • Maintain level alkali concentration throughout the cook • Reduce concentrations of dissolved lignin and Na + + • Lowest possible maximum cooking temperature Impact on Kraft Pulping Enables optimization of the pulping process through incorporation of modified technologies • Split Sulfidity Pulping • Green Liquor Pretreatment • Polysulfide Pulping • Alkaline Sulfite Pulping Alkaline Sulfite – AQ Mini Sulfide - AQ 10 Continuous System-MCC White Liquor 13.3%AA White Liquor 4.1%AA White Liquor 3.1% AA To Evaps Total Alkali Total Alkali...
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This note was uploaded on 08/22/2011 for the course WPS 417 taught by Professor Kirkman during the Spring '11 term at N.C. State.

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lindstrom exam.ppt - E.V. Mathias Lindst rö m Final Exam...

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