Effect Of Microscopic Pore Structure Of Coke On Degradation Law Of Solution Loss

In order to study the effect of coke micro pore structure on solution loss and degradation behavior,ten kinds of blast furnace coke with different CRI and CSR thermal properties were selected as experimental samples.Firstly,the strength index CSR25% after solution loss was determined at 1100 ?.The pores and pore wall structures of these cokes were measured in detail by means of microscopic image analysis.The correlation between thermal properties and micro structure parameters of coke was studied by linear regression method.On this basis,the constant temperature solution loss of these coke at multiple temperature points was tested by 25%,and the degradation mode curve of coke strength with temperature after solution loss was obtained.The practical application of micro pore control of coke was studied by using 40 kg coke oven.The correlation between the CSR and the pore parameters was not significant,but the correlation between CSR25% and the pore parameters is significantly improve.A new pore parameter index was proposed,namely the half-peak width W_p of the main peak of the pore size distribution curve and the half-width W_w of the main peak of the pore wall thickness distribution curve.There was a good correlation between CSR25% and Ww,and CSR25% increased with the increase of W_w.The above research showed that the micro pore wall thickness distribution is a key factor affecting the strength of coke after its fixed solution loss.According to the curve shape degradation mode,the curve can be divided into three types: low temperature degradation,medium temperature degradation and high temperature degradation.The type of degradation mode curve is determined by the coke micro pore size distribution and matrix reactivity.Coke with smaller W_p and higher matrix reactivity are less likely to deteriorate under high temperature conditions.Four kinds of mixed coal were tested for 40 kg coking.The obtained coke was analyzed for microscopic pore structure,CRI and CSR,and solution loss degradation curve tests.The study found that adding a certain amount of 1/3 coking coal can help coke to generate more small micron pores.Compared with the other three schemes,the coke has stronger resistance to dissolution and degradation at high temperature.Figure 25;Table 18;Reference 68...