Effect Of Chlorine On Coke Gasification Process In Blast Furnace

Based on the thermogravimetric experiments,the kinetic analysis of the gasfication reaction on coke with chlorine were made by using unreacted nuclear model.The microstructure of coke after gasification reaction were characterized by X-ray diffractometer and coal char microscope.Based on the above reseraches,the kinetics of the gasification reaction on coke with chlorine is obtained,and the mechanism of chlorine influences on the thermal properties of coke is explored.By the themogravimetric experiments of coke samples,the reaction solution loss rate increases with increasing reaction temperature.When the temperature is increased within the 1273～1373K,the increase of the solution loss rate is most significant.As the mass percentage of chlorine in coke increases from 0～0.077%,the solution loss rate of gasification reaction increases.For coke with different chlorine content,the D_eand the k₊of coke increase as temperature increases.At a certain temperature,D_eand k₊rise with increasing the chlorine content.The improvement of internal diffusion caused by chlorine in the gasification reaction is greater than that of interface chemical reaction conditions.The E_aand the E_Dof the coke gasification reaction all decrease with increasing chlorine content.The interfacial reaction at the initial stage of the reaction is the main limiting link.The interfacial reaction and internal diffusion in the middle stage jointly control the reaction,and the internal diffusion is the main limiting link in the later stage.The increase of chlorine element promotes the diffusion in the gasification reaction process.Both the coke surface area and the total pore volume increase as the gasification reaction temperature increases.With the increase of chlorine content,the crystal face size L_aand the stack height L_cincrease,the ply spacing d_（002）decreases.The addition of chlorine increases the dissolution of pores in the center and edge of the coke,which promotes the coke gasification reaction and reduces its thermal performance.Figure 50;Table 17;Reference 83.