Experiment Research On Desulphurization Of Carbide Slag Of CFB

At present, coal-fired pollution is the focus of Chinese environmental pollution, in which controlling emissions of sulfur dioxide is a very important element. Carbide slag is industrial waste which includes high sulfur, the bulk deposition of it make heavy-polluted of the envirement around, if we can use it to do desulfurization, not only can decrease the pollution, but also makes good waste utilization.This article uses the thermal annlysis, makes the thermal analysis research of the carbide slag desulfurization in the thermobalance. The results of the experiment show carbide slag desulfurization reaction is divided into two stages: Calcination and Absorption. In the experimental condition, the higher the temperature is, the higher the conversion of calcium; the higher SO₂ concentration is, the shorter the reaction in chemical reaction control stage continuous time is, reaction easier to enter the product layer controlling stage.Based on the analysis of the experimental data, we determine the desulfurization process and discuss the desulfurization mechanism. Using the mathematicl models to study the carbide slag desulfuration reaction dynamical characteristic, we calculate and analyze their dynamic parameter—activation energy E, chemical reaction rate constant ks, product layer diffusion coefficient Ds. The results indicate that the mathematical model can describe the desulfurization reaction process well at the chemical reaction controlling stage and at the product layer diffusion controlling stage.Make reasonable hypothesis of the reaction process, combing unreacted shrinking core model and pore distribution model and use conservation of mass and the diffusion equation to establish CaO absorb the SO₂ particle-pore distribution model. Calculation results of the model and the experimental results are well matched. The model can describe carbide slag desulfurization process well. Finally, using a power plant actual data also proved the accuracy of the model once again. The site operation data also shows that, adding the calcium carbide slag make little effect for the boiler operation.This study provides theoretical basis for developing the waste type desulfurizer, meanwhile, it has very important theoretical value for promoting the development of desulfurization technology and directive function for engineering application.