Oxy-Combustion CO2 Emissions Control
Alstom's Chemical Looping Combustion Technology with CO2 Capture for New and Existing Coal-Fired Power Plants
Project No.: DE-FE0009484
Alstom is advancing the development of Limestone Chemical Looping Combustion (LCL-C™) technology. Chemical looping has no direct contact between air and fuel. The looping process usually utilizes oxygen from a metal carrier, but in this case, limestone is used. Economic evaluations will be made of four LCL-C plant configurations. The base configuration plant has already been completed and will be updated from previous reports. A second case will compare the effects of designing the reducer reactor using CFB sizing standards. A third case will investigate the effects of using a pressurized reducer reactor. Pressurizing the reducer reduces the reactor size and reduces the amount of compression required for the CO2 outlet gas stream. A fourth case will investigate the use of an advanced ultra-supercritical (USC) steam cycle. The advanced USC steam cycle should increase overall plant efficiency and lower the cost of electricity. Mass and energy balances will be done for each case. The four LCL-CTM cases will be compared against a supercritical pulverized coal-fired plant without CO2 capture.
In addition, a series of engineering studies will be conducted. The engineering studies will include methods of pressurizing coal feed to a pressurized reactor, sensitivity of the plant efficiency to reducer operating pressure, methods of operating two reactors with a different pressure under steady state and load change conditions, modifying or including equipment for process improvements that include but are not limited to solids separation, increasing carbon conversion and purer gas leaving the reducer and finally reviewing methods for condensing and scrubbing moisture from the gas stream. A series of bench-scale tests will be performed to determine process performance under pressurized conditions with and without the use of LCL-CTM reaction promotion methods.
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| Schematic Diagram of LCL-C System |
Related Papers and Publications:
Contacts:
- For further information on this project, contact the NETL Project Manager, Bruce Lani.
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