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Availability analysis of post-combustion carbon capture systems: minimum work input
- Proc. IMechE, Part C: J. Mechanical Engineering Science
"... Abstract: This paper describes the availability analysis of a generic, post-combustion carbon capture plant. The analysis first establishes the minimum work input required in an ideal plant with a flue gas inlet temperature equal to the sink temperature. The analysis shows that the ideal work input ..."
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Abstract: This paper describes the availability analysis of a generic, post-combustion carbon capture plant. The analysis first establishes the minimum work input required in an ideal plant with a flue gas inlet temperature equal to the sink temperature. The analysis shows that the ideal work input is surprisingly low and that, roughly equal amounts of work are required to first separate and then compress the CO2 contained in a typical flue gas stream. The analysis is then extended to include the effects of variable inlet temperature and extraction efficiency. This extended analysis shows that there is a considerable quantity of available energy in the flue gas of a normal power station. Indeed, in principle, carbon capture is theoretically possible without any external work input for fuels of low carbon/hydrogen ratio such as heavy fuel oil and natural gas. When burning coal, the minimum work input would be significantly reduced if the flue gases’ availability were utilized. The final section of the paper compares the actual work input of a variety of carbon cap-ture schemes found in the literature, with the minimum work input for an ideal process. This comparison shows that the techniques presently found in the literature have a low second-law efficiency.
Shimin Deng Hybrid Power Generation Plant for CO 2 Capture
"... In this paper, the issues and challenges of capturing CO 2 from a pulverized coal (PC) power plant have been summarized and assessed and a hybrid power generation configuration is developed, which features a gas-turbine cogeneration unit supplying steam for stripping CO 2 , thereby decoupling the C ..."
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In this paper, the issues and challenges of capturing CO 2 from a pulverized coal (PC) power plant have been summarized and assessed and a hybrid power generation configuration is developed, which features a gas-turbine cogeneration unit supplying steam for stripping CO 2 , thereby decoupling the CO 2 capture from the steam cycle of PC units. The hybrid power generation cases are modeled by using GTPRO TM and STEAMPRO TM . The performance of the hybrid power plant is compared with the base case that uses extraction from the steam cycle. Retrofitting existing power plants by this hybrid concept is also assessed; performance comparison and economic analysis indicate that this kind of retrofitting is attractive to utilities with PC power generation fleet.
Availability analysis of post-combustion carbon capture systems:minimumwork input
, 2006
"... Abstract: This paper describes the availability analysis of a generic, post-combustion carbon capture plant. The analysis first establishes the minimum work input required in an ideal plant with a flue gas inlet temperature equal to the sink temperature. The analysis shows that the ideal work input ..."
Abstract
- Add to MetaCart
Abstract: This paper describes the availability analysis of a generic, post-combustion carbon capture plant. The analysis first establishes the minimum work input required in an ideal plant with a flue gas inlet temperature equal to the sink temperature. The analysis shows that the ideal work input is surprisingly low and that, roughly equal amounts of work are required to first separate and then compress the CO2 contained in a typical flue gas stream. The analysis is then extended to include the effects of variable inlet temperature and extraction efficiency. This extended analysis shows that there is a considerable quantity of available energy in the flue gas of a normal power station. Indeed, in principle, carbon capture is theoretically possible without any external work input for fuels of low carbon/hydrogen ratio such as heavy fuel oil and natural gas. When burning coal, the minimum work input would be significantly reduced if the flue gases’ availability were utilized. The final section of the paper compares the actual work input of a variety of carbon cap-ture schemes found in the literature, with the minimum work input for an ideal process. This comparison shows that the techniques presently found in the literature have a low second-law efficiency.
1 Computational Analysis of Combustion of Separated Coal-Gas in O2/CO2
"... This paper analyzes oxycombustion in novel power systems that separate gasified coal into hydrogen and carbon-rich fuels. The carbon-rich fuel burns in a stoichiometric mixture of oxygen and recycled carbon dioxide (O2/CO2), providing a CO2-rich product stream for sequestration. For CO2 recycle leve ..."
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This paper analyzes oxycombustion in novel power systems that separate gasified coal into hydrogen and carbon-rich fuels. The carbon-rich fuel burns in a stoichiometric mixture of oxygen and recycled carbon dioxide (O2/CO2), providing a CO2-rich product stream for sequestration. For CO2 recycle levels between 5 % and 15%, the minimum (blowout-limited) combustor residence time is calculated using a perfectly stirred reactor model with detailed chemical kinetics from the GRIMech model. Combustion occurs at conditions based on the GE H series gas turbine: pressure of 23 bars, and adiabatic flame temperature of 1800 K. Four fuel compositions are considered, corresponding to separation by metallic and polymer membranes and gasification with the Texaco and Shell processes. Results are compared to those of a methane/air system burning under the lean conditions typical of stationary power generation. The stability of the novel power systems ’ combustion is comparable to that of the natural-gas/air system, as indicated by similar heat release throughputs at extinction.
