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Jim Keiser Oak Ridge National Laboratory Oak Ridge, Tennessee With Contributions From

Materials Development For High-Temperature, High-Pressure Black Liquor Gasifiers. Jim Keiser Oak Ridge National Laboratory Oak Ridge, Tennessee With Contributions From PSL, Paprican, IPST and Simulent, Inc. Proposal prepared for April 15 th Request For Proposals

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Jim Keiser Oak Ridge National Laboratory Oak Ridge, Tennessee With Contributions From

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  1. Materials Development For High-Temperature, High-Pressure Black Liquor Gasifiers Jim Keiser Oak Ridge National Laboratory Oak Ridge, Tennessee With Contributions From PSL, Paprican, IPST and Simulent, Inc

  2. Proposal prepared for April 15th Request For Proposals • Reportedly one of several chosen for further consideration • No official confirmation of selection for funding

  3. Objectives Of The Proposed Project “Materials Development For High-Temperature, High-Pressure Black Liquor Gasification” • Provide the pulp and paper industry with extensive information on the behavior of materials for HTHP black liquor gasifiers to support wise selection of materials • Provide information that can be used in engineering designs, optimization of operating conditions and prediction of lifetimes of materials • Develop models to predict the flow and distribution of various chemical species in the gasifier • Develop models to predict the stresses and interactions between structural components of both atmospheric- and high-pressure gasifiers

  4. Experimental Approach - Tasks • Design and construct a HTHP testing facility at ORNL • Expose candidate materials at ORNL, Piteå and other suitable facilities • Characterize exposed samples for phase changes and changes in thermophysical and mechanical properties • Develop models to predict 1) compositions and flow patterns of the various chemical species contacting the gasifier vessel and 2) thermochemical stability of refractories • Develop finite element models to predict the stresses between metallic and refractory components • Conduct corrosion studies to identify materials compatible with the green liquor produced in the gasifier • Recommend containment materials for the gasifier

  5. Task 1 – Construct Test Facility • Laboratory-scale pressurized test facility • Expose metallic and refractory materials • Simulate temperatures, pressures and chemical species of HTHP black liquor gasifier • Vary exposure time and cycling of atmosphere and temperature to obtain kinetics information • Especially interested in effect of elevated pressure on reaction rates, system energetics, reaction mechanisms and reaction products • Test system will also be available to other researchers possible to obtain information about chemical species under HTHP conditions

  6. Task 2 & 3 – Expose And Characterize Samples • Commercial and experimental materials will be exposed in the ORNL test system • Materials will be offered to operators of other gasifiers, including Piteå, for exposure • All materials will be thoroughly characterized before exposure • Exposed samples will be evaluated to determine effects of exposure on phases present as well as thermophysical and mechanical properties • Results will be used as input for modeling studies

  7. Tasks 4 & 5 – Develop Mathematical Models • Establish subcontract with Simulent Inc. for spray and atomization modeling • Conduct thermochemical modeling to predict composition of materials that will be resistant to gasifier environment • Establish subcontract with Process Simulations Limited for extension of their gasifier model to predict chemical species present and temperature distribution • Conduct finite element modeling to predict stresses that may be developed as a result of interactions between gasifier components

  8. Task 6 – Conduct Green Liquor Corrosion Studies • Green liquor is a highly caustic solution that can be very corrosive to materials • The green liquor produced in the HTHP gasifier is expected to be at a higher temperature and higher concentration than green liquor in a recovery boiler • The Pulp and Paper Research Institute of Canada (Paprican) has carried out project on selection of materials for containment of green liquor from black liquor recovery boilers • A subcontract will be established with Paprican to take the lead on this task

  9. Task 7 – Recommend Materials Based on results from characterization of samples exposed in high-temperature, high-pressure gasifier material recommendations will be offered

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