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Design of the process of CO2 removal in NGCC by potassium taurate solvent
No full textOne of the most mature technologies for removal of carbon dioxide from gaseous streams is chemical absorption and aqueous solutions of alkanolamines are employed, with Monoethanolamine (MEA) considered the benchmark solvent. However, its volatility and toxicity and the need for a lot of energy for regeneration made research focus on possible solvents that can perform the desired treatment of gaseous streams while reducing production and operating costs and the environmental impact, to be considered as substitutes. The process based on amino acid aqueous solutions, one type of these new solvents, has the advantage of an improved sustainability and, as the one employing aqueous solutions of potassium taurate, can also benefit of the enhancement due to the reaction of precipitation. In this work a rigorous rate-based model, built in the commercial process simulator ASPEN Plus®, properly customized for the representation of the system, is used to carry out a detailed process design for the CO2 removal section of a NGCC plant by an aqueous solutions of potassium taurate, for which no previous papers on the topics have been found in the literature. The scheme is optimized and the performances of the process are evaluated for different targets of CO2 removal
Optimal operation of a CO2 absorption plant in a post-combustion unit for cost reduction
No full textDesign of a CO2 Removal Section Treating Very High Flue Gas Flowrates
No full textCarbon capture and storage (CCS) is a technology that can be used to significantly reduce the gradual global increase in Earth warming. Several methods are available, with absorption by amine solvents being the most feasible and technologically mature. One possible successful application of this process is to the post-combustion removal of carbon dioxide from flue gas from power plants before its emission to the atmosphere. The design and optimization of this plant in order to minimize the power consumptions and the overall costs is of primary importance, in particular when dealing with very high gas flowrates to be treated. This paper aims at determining the best scheme of CO2 removal plant to be installed in a facility for power production in Italy which allows the lowest power and economic losses. Three different configurations with columns provided with trayed or packed internals have been considered and the analysis with a comparison of the schemes has been carried out. The assessment of the technical performance of the plant has been performed by employing a rigorous rate-based model in ASPEN Plus®, and the selection of the scheme which minimizes the power losses has been made by comparison of the obtained results
Comparison of CLR and SS Flexible Systems for Post-Combustion CO2 Removal in a NGCC Power Plant
No full textCarbon dioxide is essential to life on Earth, however its concentration in the atmosphere has significantly
increased since pre-industrial era, causing global warming and climate change. To reduce these effects, the
Paris Climate Agreement has established greenhouse gas emissions reduction targets, which can be
achieved by decarbonizing energy-intensive industries as electricity production. Post-combustion removal of
carbon dioxide can be obtained by employing aqueous solutions of amines - in most of the cases
MonoEthanolAmine (MEA) is used - which absorb this acid gas from the flue gas streams and are then
regenerated and recycled. They are widely employed, though being characterized by several drawbacks, as
the high energy requirement at the reboiler of the regeneration section. Therefore, though adding Carbon
Capture & Storage (CCS) to a power plant makes the production of electricity more advantageous from an
environmental point of view, its operation represents an economic loss for the plant. Possible ways of
minimizing the economic disadvantages due to the carbon dioxide removal section include running this section
in flexible mode, on the basis of the price of electricity which varies from hour to hour and from day to day. The
Capture Level Reduction (CLR) and the Solvent Storage (SS) methods are two possible solutions for flexible
operation. This work focuses on the purification of a flue gas stream from a power plant fed with natural gas
and performs simulations and techno-economic analyses of the CLR and SS modes, taking into account also
the possible application of a carbon tax. By analysing the obtained results a comparison between the two
options is carried out, and the best operating mode is determined
Application of flexible operation of post-combustion CO2 removal in a NGCC power plant in Italy
No full text
Operating the CO2 absorption plant in a post-combustion unit in flexible mode for cost reduction
Full text linkCarbon dioxide greatly contributes to climate change and its emissions must be limited. Combustion of fossil fuels in power plants to produce electricity generates the largest amount of CO2 released into the atmosphere, therefore application of Carbon Capture and Storage (CCS) to this sector would help in reducing the emissions of this acid gas. CO2 absorption with aqueous amines is the most common capture technology for post-combustion CO2 removal and is characterized by high energy requirements, mainly for CO2 release from the solvent and compression of the obtained rich-CO2 stream. For this reason operating the CCS system in a power plant significantly reduces the power output and, consequently, the revenues from selling electricity. In order to deal with this issue while maintaining low carbon dioxide emissions, flexible operation may be applied. In this work, a detailed analysis of the application of the solvent storage mode for flexible operation of the CO2 removal section of a natural gas combined cycle power plant has been performed. Simulations in ASPEN Plus®, properly customized for the description of the system, and a techno-economic model created by the GASP group of Politecnico di Milano have been run to find the best solution. The variation of price of electricity from hour to hour for key days and for the overall year have been considered. Different values of carbon tax to be applied have been also taken into account
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