1 / 1

Gasification kinetics of char from olive tree pruning with CO 2 and steam in fluidized bed

Gasification kinetics of char from olive tree pruning with CO 2 and steam in fluidized bed. Susanna Nilsson 1 , Alberto Gómez-Barea 1 , Diego Fuentes 1 , Israel Pardo 1 , Guadalupe Pinna 2 , Manuel Antonio Silva Perez 2 , Pedro Ollero 1 1 Chemical and Environmental Engineering Department.

myrilla-favian
Download Presentation

Gasification kinetics of char from olive tree pruning with CO 2 and steam in fluidized bed

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Gasification kinetics of char from olive tree pruning with CO2 and steam in fluidized bed Susanna Nilsson1, Alberto Gómez-Barea1, Diego Fuentes1, Israel Pardo1, Guadalupe Pinna2, Manuel Antonio Silva Perez2, Pedro Ollero1 1Chemical and Environmental Engineering Department. Escuela Superior de Ingenieros (University of Seville) Camino de los Descubrimientos S/N. 41092,Seville (Spain) 2 Foundation Advanced Technological Centre for Renewable Energy (CTAER) Paraje los Retamares S/N. 04200, Tabernas -Almería (Spain) Objective To measure the kinetics of gasification of char from olive tree pruning (OTP) in fluidized bed (FB) with CO2 and steam and study: • Influence of temperature and gas concentration • Inhibition effect of H2 and CO • Simultaneous gasification with CO2 and steam Experimental Experimental setup Operation conditions Material • Temperature: 760-900 ºC • Fluidizing gas: • N2-CO2–CO mixtures, 10-40% CO2, 0-10% CO • N2-H2O–H2 mixtures, 20-40% H2O, 0-10% H2 • N2-CO2-H2O mixtures, 20% H2O, 20-40% CO2 • Atmospheric pressure • Fuel: Pelletized OTP ground to a particle 1-2,8 mm to measure intrinsic kinetics • Bed material: Bauxite, 250-500 µm • Fuel batch size: 3-8 g • bed material: 300g • Char generated in situ in the FB Results • The reaction with steam was 3-4 times faster than the reaction with CO2. • The activation energy was 190 kJ/mol with CO2, and 150 kJ/mol with steam. • The apparent reaction order was 0,3-0,5 with respect to CO2 and around 0,3 with respect to steam • The inhibition effects of CO and H2 were very important, especially at low temperature. Addition of 10% CO reduced the reaction rate with CO2 with up to 70 %. Addition of 10% H2 reduced the reaction rate with steam with around 30%. N2-CO2 Mixtures N2-H2O Mixtures Conversion at different times with N2-H2O mixture and N2-CO2-H2O mixture Reaction rate as a function of conversion at 800 ºC: • The shape of the dx/dt vs x curve was similar for the reactions with CO2 and steam. • The shape did not vary with CO2 or H2O concentration and no extraordinary effects of varying temperature were observed. • The conversion achieved after a certain time of reaction increased when adding CO2 to mixture of steam and N2.

More Related