Fluidized Bed Coal Gasification with CO₂ under Direct Irradiation with Concentrated Visible Light

Abstract

Solar CO 2 gasification of coal was demonstrated under direct irradiation of the fluidized coal bed with the concentrated visible light from a solar furnace simulator in a small-scale quartz reactor. Pulverized Australian bituminous coal (the average particle size of 140 µm) was tested. The peak energy-flux density, FD peak of the incident light beam was varied up to 1270 kW m -2 . The light-to-chemical (enthalpy) energy conversion via the solar gasification increased with increasing the energy-flux density of irradiation. The maximum energy conversion of 8% was obtained at the optimum gas velocity for fluidization of 0.96 N m min -1 .

Steam gasification of coal cokes by internally circulating fluidized-bed reactor by concentrated Xe-light radiation for solar syngas production

“…The concepts of solar receiver-reactors, used for driving the solar gasification process, have been demonstrated for solar gasification reactors including direct-absorbing particle bed [4,5], molten salt pool [6], vortex-flow [7,8], particle-flow [9], and packed-bed [10] designs. Indirect-absorbing particle reactors have been scaled-up to pilot plant stage and experimentally tested for solar gasification of carbonaceous materials [9,10].…”

A high temperature drop-tube and packed-bed solar reactor for continuous biomass gasification

“…Allothermal solar gasification is particularly attractive since it results in high product yields along with a better control of the H 2 /CO ratio [3]. Either direct heating solar reactors (packed bed [4] or fluidized bed [5]) or indirect heating solar reactors (packed bed [6] or fluidized bed [7]) have been reported. In this paper, solar biomass gasification in a tubular solar reactor installed at the focus of a 2 kWthermal solar concentrator of PROMES-CNRS laboratory is studied.…”

Solar Gasification of Biomass: Kinetics of Pyrolysis and Steam Gasification in Molten Salt

“…Nonuniform temperature distributions have been observed in packed beds [5,6,13] due to poor heat transfer, while poor absorption of radiation by biomass has been observed in fluidized beds [8,14]. Slow heat transfer coupled with the necessary high flow rates of fluidizing gas have led to solar to chemical conversion efficiencies of only 8-10% [8].…”