Date

2016

Document Type

Dissertation

Degree

Doctor of Philosophy

Department

Chemical Engineering

First Adviser

Caram, Hugo S.

Other advisers/committee members

Kothare, Mayuresh; Silebi, Cesar; LaCava, Alberto; Gupta, Ramesh; Weston, Simon C.

Abstract

This work can be divided into two parts: the first part is focused on carbon capture; the second part is devoted to the study of pumped heat electricity storage processes. Thermodynamic analysis of energy requirement for adsorption and chemical looping processes is investigated. It enables us to compare various technology platforms under the same separation target. Sorption-enhanced reaction is a novel intensified process by combining catalyst and adsorbent in a single fixed bed reactor. Experimental studies of sorption-enhanced water gas shift and steam methane reforming have been done by previous members of our group. Here numerical studies on the interactions between reaction and sorption in a sorption-enhanced reactor are carried out. Water-gas shift reaction, hydrogen sulfide decomposition and propene metathesis reaction are studied. Our results suggest that the produce purity depend on factors such a reaction kinetics, stoichiometry, equilibrium and adsorption isotherm. Mass transfer resistance can also play an important role in product purity. Experimental studies on high temperature carbon dioxide capture by pressure swing adsorption using Na-promoted alumina are undertaken for the first time. The effects of steam during regeneration are discussed. Pumped heat electricity storage processes are a novel thermal energy storage technique recently proposed. It does not require specific geological structure sites and is environmentally friendly. When combined with renewable energy resources, e.g. solar, wind and tidal, it can supply stable power throughout the day. During the charging and delivery cycle a cyclic steady state temperature distribution is formed inside the storage tank. In order to reduce the computing time to simulate this process, a novel matrix exponential solution is provided. Dimensionless analysis on the process performance is discussed.

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