Abstract

An organic waste gasification scheme based on the use of a new reactor concept has been investigated. The gasifier includes an intermediate heat carrier matrix, moving opposite to the gas stream. A technical embodiment of the concept is presented and a computational model for the description of the process in the reactor is developed. The first stage of the experimental study demonstrates the possibility of a two-phase counter-flow concept as a mean of providing super-adiabatic conditions, which are expected to enhance weak exothermic reactions and endothermic gasification reactions in the reforming zone. To perform a parametric study, the mathematical model was run in a simplified case with a single source of reaction-liberated energy. Temperature profiles were obtained and from our first predictive results, one can conclude that there is a broad range of combinations of gas velocity, matrix velocity and oxygen addition to control the gasification process. A feeding system and atomization into the moving matrix is currently developed to feed the reactor with an organic solid fuel downstream of the steam addition. The next stage of the research will allow us to test the complete gasification scheme with a selected biomass material. The simulation model will permit to evaluate anticipated performance of the moving matrix reactor and thus optimization of the process.

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