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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

CFD SIMULATION OF EXHAUST REFORMING CHARACTERISTICS IN CATALYTIC FIXED BED REACTORS FOR A NATURAL GAS ENGINE

Zunhua Zhang
Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan, Hubei 430063 PR China; School of Energy and Power Engineering, Wuhan University of Technology, Wuhan, Hubei 430063, PR China

Pengpeng Jia
School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, PR China

Shangsheng Feng
MOE Key Laboratory for Multifunctional Materials and Structures (LMMS), State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Laboratory for Vibration Control of Aerospace Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, P.R. China; Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an 710049, P.R. China

Junjie Liang
Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan, Hubei 430063 PR China; School of Energy and Power Engineering, Wuhan University of Technology, Wuhan, Hubei 430063, PR China

Gesheng Li
Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan, Hubei 430063 PR China; School of Energy and Power Engineering, Wuhan University of Technology, Wuhan, Hubei 430063, PR China

DOI: 10.1615/IHTC16.cms.023341
pages 1761-1767


KEY WORDS: porous media, energy conversion and storage, exhaust reforming, pecked beds, hydrogen production

Abstract

Coupled with detailed catalytic reaction mechanism, the exhaust reforming process in a fixed bed reactor was simulated using a porous media model to investigate the reforming characteristics under different initial conditions. The effects of gas hourly space velocity (GHSV), feed component, steam addition and wall temperature on the methane conversion rate, hydrogen yield and other characteristic parameters were analyzed. The simulation results show that the methane conversion and hydrogen production decreases with the rise of GHSV, while the molar ratio of H2 to CO increases first and then decreases. As the ratio of methane to exhaust increases, a higher molar fraction of hydrogen in the outlet can be achieved owing to a bigger proportion of partial reforming reaction of methane, and methane conversion rate decreases. It also suggests that a modest steam addition is preferable for both the reforming performance and the life span of the fixed bed.

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