The partly hot-water driven CO2 capture plant offers a significant potential for improvement in performance when implemented in a combined-cycle power plant (CCPP). It is possible to achieve the same performance with a dual-pressure steam cycle as in a triple-pressure unit. Even a single-pressure plant can attain an efficiency competitive with that achievable with a triple-pressure plant without the hot-water reboiler. The underlying reasons are better heat utilization in the heat recovery unit and less steam extraction to the absorbent regenerating unit(s). In this paper, the design criteria for a combined cycle power plant utilizing hot-water absorbent regeneration will be examined and presented. The results show that the most suitable plant is one with two steam pressure levels. The low-pressure level should be much higher than in a conventional combined cycle in order to increase the amount of heat available in the economizer. The external heat required in the CO2 capture plant is partly supplied by the economizer, allowing temperature optimization in the unit. The maximum value of the low-pressure level is determined by the reboiler, as too great a temperature difference is unfavorable. This work evaluates the benefits of coupling the economizer and the reboiler in a specially designed CCPP. In the CO2 separation plant both monoethanolamine (MEA) and ammonia are evaluated as absorbents. Higher regeneration temperatures can be tolerated in ammonia-based plants than in MEA-based plants. When using a liquid heat carrier the reboiler temperature is not constant on the hot side, which results in greater temperature differences. The temperature difference can be greatly reduced by dividing the regeneration process into two units operating at different pressures. The possibility of extracting more energy from the economizer to replace part of the extracted steam increases the plant efficiency. The results show that very high efficiencies can be achieved without using multiple pressure-levels.
Skip Nav Destination
e-mail: klas.jonshagen@energy.lth.se
e-mail: majed.sammak@energy.lth.se
e-mail: magnus.genrup@energy.lth.se
Article navigation
January 2012
Research Papers
Postcombustion CO2 Capture for Combined Cycles Utilizing Hot-Water Absorbent Regeneration
Klas Jonshagen,
Klas Jonshagen
Department of Energy Sciences,
e-mail: klas.jonshagen@energy.lth.se
Lund University
, SE-22100 Lund, Sweden
Search for other works by this author on:
Majed Sammak,
Majed Sammak
Department of Energy Sciences,
e-mail: majed.sammak@energy.lth.se
Lund University
, SE-22100 Lund, Sweden
Search for other works by this author on:
Magnus Genrup
Magnus Genrup
Department of Energy Sciences,
e-mail: magnus.genrup@energy.lth.se
Lund University
, SE-22100 Lund, Sweden
Search for other works by this author on:
Klas Jonshagen
Department of Energy Sciences,
Lund University
, SE-22100 Lund, Sweden
e-mail: klas.jonshagen@energy.lth.se
Majed Sammak
Department of Energy Sciences,
Lund University
, SE-22100 Lund, Sweden
e-mail: majed.sammak@energy.lth.se
Magnus Genrup
Department of Energy Sciences,
Lund University
, SE-22100 Lund, Sweden
e-mail: magnus.genrup@energy.lth.se
J. Eng. Gas Turbines Power. Jan 2012, 134(1): 011702 (7 pages)
Published Online: October 27, 2011
Article history
Received:
April 12, 2011
Revised:
April 13, 2011
Online:
October 27, 2011
Published:
October 27, 2011
Citation
Jonshagen, K., Sammak, M., and Genrup, M. (October 27, 2011). "Postcombustion CO2 Capture for Combined Cycles Utilizing Hot-Water Absorbent Regeneration." ASME. J. Eng. Gas Turbines Power. January 2012; 134(1): 011702. https://doi.org/10.1115/1.4004146
Download citation file:
Get Email Alerts
Cited By
Image-based flashback detection in a hydrogen-fired gas turbine using a convolutional autoencoder
J. Eng. Gas Turbines Power
Fuel Thermal Management and Injector Part Design for LPBF Manufacturing
J. Eng. Gas Turbines Power
An investigation of a multi-injector, premix/micromix burner burning pure methane to pure hydrogen
J. Eng. Gas Turbines Power
Related Articles
Combined Cycles With CO 2 Capture: Two Alternatives for System Integration
J. Eng. Gas Turbines Power (June,2010)
A Novel Approach of Retrofitting a Combined Cycle With Post Combustion CO 2 Capture
J. Eng. Gas Turbines Power (January,2011)
Importance of Auxiliary Power Consumption for Combined Cycle Performance
J. Eng. Gas Turbines Power (April,2011)
Chemical-Looping Combustion for Combined Cycles With CO 2 Capture
J. Eng. Gas Turbines Power (July,2006)
Related Chapters
Introduction
Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration
Combined Cycle Power Plant
Energy and Power Generation Handbook: Established and Emerging Technologies
Lay-Up and Start-Up Practices
Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration