Dynamics of a solar thermochemical reactor for steam-reforming of methane

被引：44

作者：

Petrasch, Joerg

Steinfeld, Aldo ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Dept Mech & Proc Engn, CH-8092 Zurich, Switzerland

[2] Paul Scherrer Inst, Solar Technol Lab, CH-5232 Villigen, Switzerland

来源：

CHEMICAL ENGINEERING SCIENCE | 2007年 / 62卷 / 16期

关键词：

dynamic simulation; solar reactor; solar reforming; radiation; heat transfer; porous media;

D O I：

10.1016/j.ces.2007.04.036

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A nonlinear dynamic model is developed for a steam/methane-reforming reactor that uses concentrated solar radiation as the source of high-temperature process heat. The model incorporates a set of lumped-parameter reservoirs for mass and energy. For each reservoir, the unsteady mass and energy conservation equations are formulated, which couple conduction, convection, and radiation heat transfer with the temperature dependent chemical conversion. Radiative exchange, the dominant heat transfer mode at above 800 K, is solved by a band-approximation Monte Carlo technique. The dynamic model is applied to predict the transient behavior of a 400kW prototype solar reformer in operational modes of purging, thermal testing, startup, chemical reaction, shutdown, and cyclical operation. Time constants vary between 2 s for species transport and 1 x 10(5) s for thermal energy transport through ceramic insulation. Validation is accomplished by comparing modeled and experimentally measured outlet gas temperatures obtained from reactor tests in a solar tower facility. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：4214 / 4228

页数：15