Abstract
Thermodynamic design methods and performance calculation models for chemical reformers that can be used to recuperate exhaust heat and to improve combustion quality are investigated in this paper. The basic structure of the chemical reformer is defined as series-wound reforming units that consist of heat exchangers and cracking reactors. The CH4-steam reforming reaction is used in the chemical reformers and a universal model of this reaction is built based on the minimization of Gibbs free energy method. Comparative analyzes between the results of the calculation and a plasma-catalyzed CH4-steam reforming reaction experiment verify that this universal model is applicable and has high precision. Algorithms for simulation of series-wound reforming units are constructed and the complexity of the chemical reformers is studied. A design principle that shows the influence of structural complexity on the quantity of recovered heat and the composites of the reformed fuel can be followed for different application scenarios of chemical reformers.
Highlights
Waste heat recuperation and storage systems for power machines have been the subject of much research enthusiasm in recent years
The this paper proposes the following: (1) to inspect the coupling design process of heat transfer and chemical reaction; (2) to establish an accurate and reliable performance calculation model for chemical reformers and to verify model availability; (3) to study the influence of structure complexity on the chemical reformers characteristics
Chemical reformers are used in power machines to improve the overall efficiency and combustion characteristics
Summary
Waste heat recuperation and storage systems for power machines have been the subject of much research enthusiasm in recent years. The other method adopts lumped parameter method modeling heat transfer processes and chemical reactions [35] This is a convenient way to calculate performance, but recognizes fewer structural parameters. Based on the limited fuel-steam reforming data or immature reaction mechanisms, computational fluid dynamics (CFD) methods are used to investigate the structural design of the chemical reformers [33,37,42]. Such a method is not adapted to obtain characteristic data under all working conditions and to design chemical reformers. The this paper proposes the following: (1) to inspect the coupling design process of heat transfer and chemical reaction; (2) to establish an accurate and reliable performance calculation model for chemical reformers and to verify model availability; (3) to study the influence of structure complexity on the chemical reformers characteristics
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