Research Papers: Gas Turbines: Cycle Innovations

Novel High-Performing Single-Pressure Combined Cycle With CO2 Capture

[+] Author and Article Information
Nikolett Sipöcz, Mohsen Assadi

Department of Mechanical and Structural Engineering and Material Science, University of Stavanger, N-4036 Stavanger, Norway

Klas Jonshagen, Magnus Genrup

Division of Thermal Power Engineering, Department of Energy Sciences, Lund University, P.O. Box 118, S-221 00 Lund, Sweden

J. Eng. Gas Turbines Power 133(4), 041701 (Nov 22, 2010) (8 pages) doi:10.1115/1.4002155 History: Received April 13, 2010; Revised May 03, 2010; Published November 22, 2010; Online November 22, 2010

The European electric power industry has undergone considerable changes over the past two decades as a result of more stringent laws concerning environmental protection along with the deregulation and liberalization of the electric power market. However, the pressure to deliver solutions in regard to the issue of climate change has increased dramatically in the last few years and has given rise to the possibility that future natural gas-fired combined cycle (NGCC) plants will also be subject to CO2 capture requirements. At the same time, the interest in combined cycles with their high efficiency, low capital costs, and complexity has grown as a consequence of addressing new challenges posed by the need to operate according to market demand in order to be economically viable. Considering that these challenges will also be imposed on new natural gas-fired power plants in the foreseeable future, this study presents a new process concept for natural gas combined cycle power plants with CO2 capture. The simulation tool IPSEpro is used to model a 400 MW single-pressure NGCC with post-combustion CO2 capture using an amine-based absorption process with monoethanolamine. To improve the costs of capture, the gas turbine GE 109FB is utilizing exhaust gas recirculation, thereby, increasing the CO2 content in the gas turbine working fluid to almost double that of conventional operating gas turbines. In addition, the concept advantageously uses approximately 20% less steam for solvent regeneration by utilizing preheated water extracted from heat recovery steam generator. The further recovery of heat from exhaust gases for water preheating by use of an increased economizer flow results in an outlet stack temperature comparable to those achieved in combined cycle plants with multiple-pressure levels. As a result, overall power plant efficiency as high as that achieved for a triple-pressure reheated NGCC with corresponding CO2 removal facility is attained. The concept, thus, provides a more cost-efficient option to triple-pressure combined cycles since the number of heat exchangers, boilers, etc., is reduced considerably.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Schematic figure of the reference CC

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Figure 2

Temperature to heat flux diagram of the single-pressure cycle with (solid line) and without CO2 capture (dotted line)

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Figure 3

Temperature to heat flux diagram of the single-pressure cycle with CO2 capture and regular steam boiler (solid line) and with the water and steam reboiler (dotted line)

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Figure 4

Schematic figure of the single-pressure CC with CO2 capture and compression

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Figure 5

Temperature to heat flux diagram of the two cases with regular steam supported reboiler (dotted line) and the case with water/steam-driven reboiler (solid line)



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