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Oxy-fuel combustion with many advantages such as high combustion efficiency, low flue gas flow rate and low NOx emission has emerged as a promising CCS technology for coal combustion facilities. In this study, the effects of the direct sulfation reaction on removal efficiency were evaluated in a drop tube furnace under typical oxy-fuel combustion conditions represented by high concentrations of and formed by gas recirculation to control furnace combustion temperature. The effects of the operating parameters including the reaction temperature, concentration, concentration, Ca/S ratio and humidity on removal efficiency were investigated experimentally. removal efficiency increased with reaction temperature up to 1,200 due to promoted calcination of limestone reagent particles. And removal efficiency increased with concentrations and the humidity of the bulk gas. The increase of removal efficiency with concentrations showed that removal by limestone was mainly done by the direct sulfation reaction under oxy-fuel combustion conditions. From the impact assessment of operation parameters, it was shown that these parameters have an effects on the desulfurization reaction by the order of the Ca/S ratio > residence time > concentration > reaction temperature > concentration > concentration > water vapor. The semi-empirical model equation for to evaluate the effect of the operating parameters on the performance of in-furnace desulfurization for oxy-fuel combustion was established.

hwahag gonghag/hwahak gonghak

Study on the Desulfurization Characteristic of Limestone Depending on the Operating Parameters of In-Furnace Desulfurization for Oxy-Fuel Combustion Using Drop Tube Furnace