| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 237080 | Powder Technology | 2012 | 11 Pages |
This work presents the design and experimental evaluation of a cold-flow model, built to simulate a 100 kW chemical-looping combustor for solid fuel. A theoretical background is provided, as well as some initial results using air as fluidization medium. The cold-flow model has been operated for about 10 h and shows no indication of imbalances in the bed inventories. In the fuel and air reactors, the mass fluxes were found to be linear in the riser pressure drop and the corresponding measured mass flows were approximately proportional to the mass flows calculated from the riser pressure drop. From the study of mass flows, residence times in both the fuel and air reactor were obtained. From pressure profile investigations, it was found that the system remained stable to changes in the fluidization velocity. Thus, both the internal circulation in the fuel reactor, and the circulation between air and fuel reactor, could be varied in a large range with only minor impact on the solids inventories of the air and fuel reactors.
Graphical abstractThe system is a 3 m high, 58% scale, cold-flow model of a 100 kW unit. It is made from acrylic glass, with eight inlets for fluidization of small sand particles. When fluidizing, the sand particles circulate in the system, simulating the chemical-looping combustion process of the 100 kW unit.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The mass fluxes in the fuel and air reactors are linear in the riser pressure drop. ► The mass flows in the fuel and air reactors are close to linear in the riser flow. ► The residence time in the fuel reactor lie between 2 and 11 min. ► The residence time in the air reactor lie between 3 and 21 min. ► The solids inventory is stable to changes in the fluidization velocity.
