Effect of Hydrogen Separation on Coal Char Gasification with Subcritical Steam Using a Calcium-Based CO2 Sorbent | Zendy

Kazuhiro Kumabe | Zendy; Yuya Hasegawa | Zendy; Hiroshi Moritomi | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Effect of Hydrogen Separation on Coal Char Gasification with Subcritical Steam Using a Calcium-Based CO₂ Sorbent

Author(s) -

Kazuhiro Kumabe,

Yuya Hasegawa,

Hiroshi Moritomi

Publication year - 2019

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.9b02591

Subject(s) - char , hydrogen production , hydrogen , sorption , sorbent , chemistry , chemical engineering , membrane reactor , steam reforming , tar (computing) , coal , inorganic chemistry , waste management , adsorption , organic chemistry , engineering , programming language , computer science

Coal char was gasified using subcritical steam with/without a CO 2 sorbent (CaO) and/or a hydrogen separation membrane (palladium-23% silver) in a batch/semibatch autoclave reactor to investigate the kinetics in terms of the effect of hydrogen separation at 590-650 °C and 1.9-2.4 MPa in order to support a hydrogen production process of the HyPr-RING method. CO 2 sorption by CaO affects the production rate of H 2 but scarcely affected the carbon conversion to gas. Hydrogen separation promotes the hydrogen production in spite of the absence of CO 2 sorption. The effect of hydrogen separation on hydrogen yield and carbon conversion was higher than that of CO 2 sorption. A higher gasification temperature increased the hydrogen yield and carbon conversion. Using a first-order reaction form in parallel, the gasification reaction mechanism was explained for the components of the volatile matter and char in coal char. A higher reaction temperature results in an increase of the values of any kinetic constant for subcritical steam gasification of Adaro coal char with/without CaO and/or a hydrogen separation membrane. CO 2 sorption promoted hydrogen production due to the tar from volatiles with the catalytic effects of CaO, whereas hydrogen separation promoted hydrogen production due to char.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research