English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/147632
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Optimized design and operation strategy of a Ca-Cu chemical looping process for hydrogen production

AutorFernández García, José Ramón ; Abanades García, Juan Carlos
Palabras claveHydrogen production
CO2 capture
Sorption enhanced reforming
Calcium looping
Chemical looping
Fixed bed
Fecha de publicación18-mar-2017
CitaciónChemical Engineering Science 166: 144–160 (2017)
ResumenThis work describes the performance of an improved Casingle bondCu looping process designed to produce H2 and/or power from natural gas while generating CO2 suitable for reuse and/or permanent storage. The core of the process relies on an arrangement whereby fixed-bed reactors perform adiabatically. A sequence of five stages: sorption enhanced reforming (SER), Cu oxidation, solid/gas heat exchange, CuO reduction/CaCO3 calcination and steam methane reforming (SMR) is used. A continuous flow rate of O2-depleted gas is produced at a sufficiently high pressure and high temperature to drive a gas turbine for the generation of power. The new process design allows the number of reactors to be reduced from the 15 originally proposed in the original scheme to only five. The energy requirements for the reduction/calcination step can be reduced by using the PSA off-gas from the H2 purification step and the syngas generated in a SMR stage. This also allows a reduction of the Cu/Ca molar ratio in the bed to a value of around 2. A dynamic reactor model partially validated in a previous work was used to simulate in detail a complete cycle of the Casingle bondCu loping process under large-scale conditions. The simulations show that the progression of the reaction and heat exchange fronts can be regulated by the partial recirculation of the product gases. A process design for a base case with a reference output of 30,000 N m3/h of pure H2 (88.5 MWth), which is the typical production of fired tubular reformers installed in refineries, shows that reactors 6 m long with an inner diameter of 3 m would be sufficient to carry out the entire process, assuming a cycle duration of 15 min and a maximum drop in inlet pressure of 10% per stage. A hydrogen production efficiency of 77% is achievable, which is 6 net points above the efficiency of benchmarks based on fired tubular reformers that use amines (MDEA) to remove the CO2. A CO2 capture efficiency of about 95% is obtained, which is 10 net points higher than the values typically estimated for reference H2 plants that use MDEA absorption.
Versión del editorhttp://dx.doi.org/10.1016/j.ces.2017.03.039
Aparece en las colecciones: (INCAR) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Optimized_design_Fernandez_2017.pdf Embargado hasta 19 de marzo de 20191,21 MBAdobe PDFVista previa
Visualizar/Abrir     Petición de una copia
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.