Development of a numerical model for natural gas steam reforming and coupling with a furnace model

• Published in: International journal of hydrogen energy Vol. 35; no. 18; pp. 9776 - 9787
• Main Authors: Ventura, C., Azevedo, J.L.T.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 01-09-2010; Elsevier
• Subjects: Alternative fuels. Production and utilization; Applied sciences; Boundaries; C (programming language); Channels; Computational Fluid Dynamics; Cross sections; Energy; Exact sciences and technology; Fuels; Furnaces; Hydrogen; Mathematical models; Numerical simulation; Reforming; Steam reforming; Tubes; Computational Fluid Dynamics; Numerical simulation; Steam reforming; Energy balance; Tubular reactor; Computational fluid dynamics; Hydrogen; Performance; Natural gas
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2010.05.060

This paper presents a numerical model (SRP) that was developed to describe the steam reforming process within tubes or channels. This model was implemented in C language and is used as a User-Defined Function (UDF) in the commercial program Fluent. The SRP model is one-dimensional representing mass and energy balances along the tubes/channels assuming uniform conditions in the cross section, except for temperature within porous regions. The model calculates the gas species concentrations and temperature profiles along the tubes/channels and since it is coupled with the Fluent furnace calculation, the boundary temperature is continuously updated and is a model result.
The validation of the procedure was demonstrated by comparing the SRP model with experimental results obtained in a laboratory tubular reactor in a furnace. The SRP model was then integrated with Fluent enabling its use in the simulation of a 5 kg/day steam reformer. The reformer has a central burner within the furnace vessel that is surrounded by channels with multiple passages where the reforming reaction occurs. The model was used considering several mixtures and shows how these impacts on reformer performance.