Experimental investigation of reforming and flow characteristics of a steam methane reformer filled with nickel catalyst of various shapes

TY - JOUR

T1 - Experimental investigation of reforming and flow characteristics of a steam methane reformer filled with nickel catalyst of various shapes

AU - Pashchenko, Dmitry

N1 - Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/4/1

Y1 - 2019/4/1

N2 - An experimental investigation of the steam methane reforming process in a cylindrical packed bed filled with the Ni-αAl2O3 catalysts was performed to understand the effect of particle shapes of catalyst on a pressure drop and a methane conversion. Four particle shapes such as a simple cylinder, a Raschig ring, a 7-holes cylinder, and a 7-holes sphere were tested. Moreover, the simple cylinders and the Raschig rings were tested for various end-to-end dimensions (5 mm, 10 mm, 15 mm, 20 mm, 25 mm). The present study showed that the methane conversion is increasing with an increase in the geometric surface of the packed at a constant packed bed length (600 mm). Two quantities are proposed for evaluating the effectiveness of the packed beds filled with a catalyst of various shape: a weight residence time (kgcat·s/mol) and a surface residence time (m2·s/mol). The maximum methane conversion is observed for the 7-holes spheres. The catalytic activity of the surface unit of all investigated catalyst shapes is approximately the same. A characteristic quadratic dependence of a pressure drop versus velocity ΔP=f(u2) is observed for all catalyst types. The minimum pressure drops are taking place in a packed bed filled with the 7-holes cylinders, while the maximum pressure drops are occurring for the simple cylinders. The linear (1/mm) and volumetric (1/m3) drag coefficient were calculated. The drag coefficient is decreasing when the velocity decreases, especially in the velocity range up to 1 m/s.

AB - An experimental investigation of the steam methane reforming process in a cylindrical packed bed filled with the Ni-αAl2O3 catalysts was performed to understand the effect of particle shapes of catalyst on a pressure drop and a methane conversion. Four particle shapes such as a simple cylinder, a Raschig ring, a 7-holes cylinder, and a 7-holes sphere were tested. Moreover, the simple cylinders and the Raschig rings were tested for various end-to-end dimensions (5 mm, 10 mm, 15 mm, 20 mm, 25 mm). The present study showed that the methane conversion is increasing with an increase in the geometric surface of the packed at a constant packed bed length (600 mm). Two quantities are proposed for evaluating the effectiveness of the packed beds filled with a catalyst of various shape: a weight residence time (kgcat·s/mol) and a surface residence time (m2·s/mol). The maximum methane conversion is observed for the 7-holes spheres. The catalytic activity of the surface unit of all investigated catalyst shapes is approximately the same. A characteristic quadratic dependence of a pressure drop versus velocity ΔP=f(u2) is observed for all catalyst types. The minimum pressure drops are taking place in a packed bed filled with the 7-holes cylinders, while the maximum pressure drops are occurring for the simple cylinders. The linear (1/mm) and volumetric (1/m3) drag coefficient were calculated. The drag coefficient is decreasing when the velocity decreases, especially in the velocity range up to 1 m/s.

KW - Catalyst

KW - Catalyst shape

KW - Methane conversion

KW - Methane reforming

KW - Nickel catalyst

KW - Packed bed

UR - http://www.scopus.com/inward/record.url?scp=85061714685&partnerID=8YFLogxK

U2 - 10.1016/j.enconman.2019.01.103

DO - 10.1016/j.enconman.2019.01.103

M3 - 文章

AN - SCOPUS:85061714685

SN - 0196-8904

VL - 185

SP - 465

EP - 472

JO - Energy Conversion and Management

JF - Energy Conversion and Management

ER -