Development of a 5kWth internally circulating fluidized bed reactor containing quartz sand for continuously-fed coal-coke gasification and a beam-down solar concentrating system

Fluidized Beds for Concentrated Solar Thermal Technologies—A Review

“…Solar gasification is a promising route for thermochemical conversion of carbon-based materials (coal, coke, biomass) (Puig-Arnavat et al, 2013;Troiano et al, 2017a;Gokon et al, 2019) and the most investigated process for solar fuels production when compared to pyrolysis and torrefaction (Hopkins et al, 1984;Berber and Fletcher, 1988;Lédé, 1999;Tregambi et al, 2019d). Solar gasification represents an efficient path to store solar energy as a chemical vector, with upgraded energy content (approximately ∼45%) of the syngas compared to the carbon feedstock, improving the dispatchability of the initial resource.…”

“…Among the benefits of the solar thermochemical process, absence of partial combustion of the feedstock, no contamination from combustion by-products and no need for upstream air separation are highlighted. In addition, costs for cleaning and separation of downstream gas are reduced (Gregg et al, 1980;Lédé, 1999;Puig-Arnavat et al, 2013;Gokon et al, 2019). The use of highly concentrated solar power enables higher gasification temperatures (>1,200°C), hence faster reaction kinetics, improved syngas quality and reduced tar content (Troiano et al, 2020b).…”

“…Recent developments at Niigata University include the development of a beam-down sun-simulator with lighting provided by three 7 kW e Xe-lights and a novel design of the windowed 5 kW th internally circulating FB reactor. Test programs were specifically aimed at characterizing the variation in temperature and its distribution within the bed, rates of gasification for coal coke, conversion of C and chemical storage efficiencies (Bellan et al, 2017, Bellan et al, 2018aBellan et al, 2018b;Bellan et al, 2018c;Bellan et al, 2019a;Bellan et al, 2019b;Gokon et al, 2019). The important role of the volume fraction of coal-coke in the FB of quartz sand was highlighted.…”

Fluidization behavior of redox metal oxide and spinel particles to develop high-energy-density thermal energy storage system for concentrated solar power applications

“…Therefore, several reactors have been developed for TCES using metal oxide particles, which can be classified into direct and indirect reactors. One of the advantages of direct particle reactors is the high rate of heat transfer due to the suspension of particles in the gas stream (Gokon, et al, 2019c). As one of the major challenges of these particle cloud reactors is to avoid the contact between the particles and quartz window when increasing the amount of loaded particles, fluidized bed reactors were developed.…”

A Control Algorithm for the Optimization of Batch Reactor-Based Processes

“…After consulting the data, it is found that the reactor has the characteristics of strong time-delay, time-varying, and nonlinear. If viewed from a micro perspective, it would inevitably cause great difficulties to the experiment, so it is much easier to describe the whole process from a macro perspective starting from the law of heat conservation [Eypasch, Schimpe, Kanwar et al (2017); Gokon, Kumaki, Miyaguchi et al (2019)]. The establishment of heat transfer model cannot be separated from the estimation of parameters, and the essence of parameter optimization estimation is the problem of nonlinear least square method [Han, Hagos, Ji et al (2016)].…”