Advanced Combustion

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.
Block flow diagram for advanced technology case oxy-combustion,
pressurized, molten bath, supercritical with CO2 capture.

Related Papers and Publications:

Contacts:

  • For further information on this project, contact the NETL Project Manager, Steven Mascaro
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