Flowability Control of Bed Materials in a Fluidized Bed Reactor for Solar Thermochemical Process. (May 2015)

• Record Type: Journal Article
• Authors: Etori, T.; Gokon, N.; Takeuchi, A.; Miki, T.; Yokota, M.; Kodama, T.
• Is Part Of: Energy procedia. Volume 69(2015)
• Page Start: 1741
• Page End: 1749
• Publication Date: 2015-05
• Subjects: Solar energy -- Thermochemical process -- Energy conversion -- Fluidized bed reactor -- Water splitting -- Hydrogen production; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2015.03.143
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: Hydrogen production by solar thermochemical process uses concentrated solar radiation as its energy source. Various thermochemical processes operating at technically manageable temperatures which are a solar thermochemical two-step water splitting and solar gasification of carbonaceousmaterial have been extensivelystudied and demonstrated by researchers around the world. These processes arecapable of converting high-temperature heat from concentrated solar radiation into clean hydrogen from water.In this study, in order to control a flowability (fluidization state) of bed materials in a fluidized bed reactor for thermochemical processes (two-step water splitting cycle and gasification of coal coke), firstly, a basic relationship between pressure drop of inlet gas and gas flow rate was experimentally examined using bed materials with different particle sizes by a small-scale quartz reactor at ambient pressure and temperature. Secondly, the CeO2 particles having the size determined by above-describedflowability test were tested using a windowed fluidized bed reactor prototype. The fluidized bed of CeO2 particles was exposed to a concentrated Xe light by sun-simulator with an input power of about 5 kWth for the T-R step in order to release oxygen. The production rate and productivity of oxygen and the reactivity of CeO2 particles were examined in this paper.