Abstract
In chemical looping combustion of solid fuels, carbon slip from the fuel reactor to the air reactor is a critical issue. This paper presents the design and experimental evaluation of a carbon stripper (CS) in a cold flow model of a 70 kW chemical looping combustor of solid fuels. In the dual fluidized bed system, stable long-term operation was achieved. Plexiglas beads simulating the behavior of fuel particles were mixed with ilmenite particles to study the separation characteristics of the carbon stripper. The factors affecting the carbon stripper performance, such as the gas velocity in the carbon stripper, the solids circulation rates, and the inner structure of the carbon stripper, were experimentally investigated. The results showed that the separation efficiency of the Plexiglas beads was in the range of 0 to 60%. The carbon stripper added 160% additional residence time in the reducing atmosphere for the fuel particles.
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