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Study of CO2 capture processes in power plants

Amann, Jean-Marc (2007) Study of CO2 capture processes in power plants. PhD thesis Génie des Procédés, CEP - Centre Energétique et Procédés, ENSMP p.188.

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Abstract

The aim of the present study is to assess and compare various processes aiming at recover CO2 from power plants fed with natural gas (NGCC) and pulverized coal (PC). These processes are post-combustion CO2 capture using chemical solvents, natural gas reforming for pre-combustion capture by methanol and oxy-fuel combustion with cryogenic recovery of CO2. These processes were evaluated using the process software Aspen PlusTM to give some clues for choosing the best option for each type of power plant. With regard to post-combustion, an aqueous solution based on a mixture of amines (N-methyldiethanolamine (MDEA) and triethylene tetramine (TETA)) was developed. Measurements of absorption were carried out between 298 and 333 K in a Lewis cell. CO2 partial pressure at equilibrium, characteristic of its solubility in the solvent, was determined up to 393 K. The solvent performances were compared with respect to more conventional solvents such as MDEA and monoethanolamine (MEA). For oxy-fuel combustion, a recovery process, based on a cryogenic separation of the components of the flue gas, was developed and applied to power plants. The study showed that O2 purity acts on the CO2 concentration in the flue gas and thus on the performances of the recovery process. The last option is natural gas reforming with CO2 pre-combustion capture. Several configurations were assessed: air reforming and oxygen reforming, reforming pressure and dilution of the synthesis gas. The comparison of these various concepts suggests that, in the short and medium term, chemical absorption is the most interesting process for NGCC power plants. For CP power plants, oxy-combustion can be a very interesting option, as well as post-combustion capture by chemical solvents.

Item Type:PhD Thesis (PhD)
Thesis Supervisor:Bouallou, Chakib
Date:13 December 2007
Board of examiners:Sacadura, Jean-François and Grevillot, Georges and Prévost, Michel and Kanniche, Mohamed and Nougier, Luc and Bouallou, Chakib
Ecole Doctorale:ED 432 ECOLE DOCTORALE SCIENCES DES METIERS DE L'INGENIEUR
Discipline:Génie des Procédés
Collection (Fonds):ENSMP
Institution:ENSMP
Department:CEP - Centre Energétique et Procédés
Subjects:6. Chemistry, Physical Chemistry and Chemical Engineering
Uncontrolled Keywords:Combined cycle power plant, Fume collection, Solvent, Decarbonization, CO2 Capture, Natural gas reforming, Process modelling, Captage CO2, Centrale charbon, Post-combustion, Oxy-combustion, N-methyldiethanolamine, Triethylène tetramine, Simulation de procédés, Pre-combustion

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ID Code:3445
Deposited By:Claudine Abauzit
Deposited On:16 May 2008

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