High Efficiency Molten-Bed Oxy-Coal Combustion With Low Flue Gas Recirculation
Gas Technology Institute
Project Number: DE-FE0009686
Gas Technology Institute (GTI) is developing a pressurized, oxy-coal combustor. CO2 capture is simplified when firing with oxygen instead of air. Traditional combustors cannot operate with the high oxy-coal adiabatic flame temperatures and are modified with high flue gas recirculation (FGR) or water injection that significantly reduces plant efficiency. The proposed molten bed oxy-coal combustor is a disruptive technology that offers higher efficiency than existing oxy-coal combustors by greatly reducing FGR and by operating at elevated pressure. The unique combustion and heat transfer design employs a smaller less expensive combustor and reduced gas phase heat exchanger surface area. Decreased FGR results in reduced capital and maintenance costs. Anticipated benefits include a calculated plant efficiency increase of 4%, large reduction in FGR duct and equipment sizes, lower exhaust gas volume and gas handling and cleaning equipment, reduction of boiler sizes by more than 50%, decreased convective path heat exchanger surface area and maintenance, near elimination of fine ash carryover into the exhaust gas, and recovery of ash/slag as aggregate instead of as micron sized particles.
GTI will be conducting engineering design and economic analysis based on the pressurized, oxy-coal molten bed combustor following the NETL protocol with comparisons to the specified baseline supercritical steam power plant burning Illinois #6 bituminous coal. Goals for this project include coal injector testing, engineering designs, mass and energy balance calculations around this advanced combustor, energy and exergy analysis, and corrosion assessment.
|Block flow diagram for advanced technology case oxy-combustion,
pressurized, molten bath, supercritical with CO2 capture.
Related Papers and Publications:
- For further information on this project, contact the NETL Project Manager, Steven Mascaro.