Efficiency of an Integrated Gasification Combined Cycle (IGCC) power plant including CO2 removal

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Study of hydrogen sulfide absorption with diethanolamine in methanolic aqueous solutions

International audienceThe sulphur compounds are removed by various processes, among which that corresponding to the gas absorption in specific liquid solutions. This absorption is carried out by physical, chemical solvents and currently by mixing both in the so called hybrid solvents. In this work, hydrogen sulphide (H2S) absorption in a hybrid solvent containing aqueous Di-Ethanol-Amine (DEA) dissolved in methanol have been studied extensively in a modified Lewis cell reactor. Experiments have been achieved in an extended range of temperature, 313-353 K and with two mixtures (50% water, 30%DEA, 20% Methanol), (40% water, 40% DEA, 20% methanol). Through these experiments, three parameters affecting the absorption of hydrogen sulfide (temperature T, loading rate (mol H2S/mol DEA) and mass fraction %) were studied. Absorption is accelerated by raising the temperature while it is penalized by the increase in the loading rate. The absorption rate increases as the mass fraction of DEA varies from 30% to 40% to achieve an optimum loading rate (=0.25(1)at T =333 K and = 0.50 at T=353 K) for hich the absorption rate remains practically unchanged

A new CO2 absorption data for aqueous solutions of N-methyldiethanolamine + Hexylamine

International audienceThe aim of this work is to develop a new chemical solvent for CO2capture and compare its performance with a reference based solvent MDEA (MethylDiEthanolAmine). A mixture of MDEA and Hexylamine activator (HA) is designed to improve the performance of the process and allow a substantial gain in terms of energy regeneration and reducing the cost of capture. New CO2 absorption data is obtained using a Lewis cell gas-liquid interface at 298, 313 and 333 K with mass concentrations MDEA 37 wt%+ HA 3 wt%,MDEA 35 wt%+ HA 5 wt% and MDEA 33 wt%+ HA 7 wt%, to assess the CO2 absorption flux and the absorption capacity of the new solvent. Our results show that for the mixture of MDEA 37 wt%+ HA 3 wt%, the kinetics reaction is fast with reduced activation energy compared to that of MDEA 40 wt%

Efficiency of an Integrated Gasification Combined Cycle (IGCC) power plant including CO2 removal

PRES 2006. 9th Conference of Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction - PRES 2006 -- PRES 2006International audienceThis study is devoted to technical evaluation of a carbon dioxide removal in an existing Integrated Gasification Combined Cycle (IGCC) plant. This IGCC case is based on an oxygen blown entrained flow gasifier operating at 27 bar, the removal of acid gas (H2S) is performed with MDEA unit, the efficiency of this IGCC is 43% based on the low heating value (LHV) of coal. A carbon dioxide separation unit conveniently integrated in a pre-combustion separation process is chosen, in order to take advantage of the high pressure of the gas. The methanol process for carbon dioxide removal is integrated downstream the existing desulfuration unit, and after a CO shift conversion unit. In this study, the integration of the CO2 capture process to the IGCC is simulated as realistically as possible. The design parameters of both the gas turbine (the turbine inlet temperature, compressor pressure ratio, reduced flow rate) and the steam turbine (Stodola parameter) are taken into account. Maintenance of low NOx production in the combustion chamber is also considered. The production of NOx is supposed to be influenced by the low heating value of the gas which is maintained as low as for case of the synthesis gas without CO2 capture. Thus the choice is made to feed the gas turbine of the combined cycle with a diluted synthesis gas, having similar low heating value than the one produced without the CO2 capture. Plant performances for different conversion and capture rates are compared. A final optimized integration is given for 92 mol% CO conversion rate and 95 mol% CO2 absorption rates, a comparison with former studies is proposed

Method for controlling high-temperature electrolyzer in hydrogen or syngas producing system, involves deviating portion of power upstream of electrolyzer for heating stack of cells when value of power is less predetermined limit value

WO2015059404 A1Derwent Primary Accession Number: 2015-27145H [45]L'invention concerne un procédé de pilotage d'un électrolyseur à haute température dont le ou les empilements de cellules sont disposés dans une enceinte préalablement chauffée à une haute température et isolée thermiquement, l'électrolyseur étant relié à une source d'énergie électrique pour son alimentation en puissance afin de réaliser une réaction d'électrolyse, le procédé comprenant : - la surveillance (E41) de la puissance fournie par la source d'énergie ; - la déviation (E42) en amont de l'électrolyseur d'une partie de la puissance fournie par la source d'énergie pour le chauffage du ou des empilements de cellules, lorsque la valeur de la puissance fournie devient inférieure à une valeur limite préalablement déterminée ; - pas de déviation sinon. L'invention concerne également un procédé de production d'hydrogène ou de syngas intégrant le procédé de pilotage ci-dessus, un système de pilotage mettant en œuvre le procédé de pilotage ci-dessus et un système de production d'hydrogène mettant en œuvre le procédé de production d'hydrogène correspondant

Technoeconomic study of the high temperature steam electrolysis process coupled with a sodium nucle

International audienc

Modelling of the electric and thermal characteristics of solid oxide electrolysis cells used for hydrogen production

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