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Gasification Systems - Gasifier Optimization Main Area
Conversion and Fouling
Project No.: 2012.03.03 Task 3
The objective for this NETL in-house conversion and fouling project is to improve the reliability, availability and maintainability (RAM) of gasification plants by providing tools that can be used to evaluate the impact that fuel properties have on slag and refractory interaction, and to reduce plugging and fouling throughout the syngas cooling system. Utilizing these tools will aid in minimizing plugging and fouling–increasing overall plant efficiency due to improved heat transfer in heat exchangers. To achieve this, four major areas of research are being pursued:
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Particle deposition experimental schematic (click to enlarge) |
Model Development – The modeling effort involves developing a heuristic spreadsheet based reduced order model (ROM) with the capability to predict the effects of the distributive properties of fuels used in entrained-flow gasifiers on key gasifier performance indicators, so that the spreadsheet ROM may be used as a tool to investigate syngas cooler fouling, and the amount of unconverted carbon.
- Devolatization and Char Kinetics – The objective of the devolatization and char kinetics effort is to measure pyrolysis kinetics for various density and size fractions of Pittsburgh #8 and at high temperature and pressure, characterize the changes of char particles in the pyrolysis (early stages), including particle size, density, and char reactivity in carbon dioxide (CO2) and mineral matter transformations and identify the critical conversion(s) at which the particle fragmentation occurs.
- Slag Viscosity and Unburnt Carbon – The slag viscosity and unburnt carbon effort is measuring slag viscosities as a function of temperature and carbon monoxide (CO)/CO2 ratio for laboratory manufactured synthetic ash and studying the infiltration behavior of slags into a refractory material subjected to a temperature gradient.
- Particle Deposition – The particle deposition effort is conducting ash particle deposition experiments at conditions relevant to existing convective syngas coolers and uses this data to generate a comprehensive model of ash deposition probability as a function of feedstock size and density fractions, ash particle size, particle temperature, particle velocity, surface temperature, and contact angle.
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Contacts:
- For further information on this project, contact the NETL Project Manager, Chris Guenther.
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