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采用压汞仪测量焦炭与CO_2或H_2O反应后的孔隙结构特征,研究孔隙率、平均孔径、比表面积及孔径分布对焦炭高温抗拉强度的影响规律.焦炭孔隙率和平均孔径随反应率升高而增加.平均孔径小于30μm时气化反应以造孔为主,比表面积随反应率升高先增后减,大于30μm时以扩孔为主,随反应率升高而减小.与CO_2相比,H_2O反应后焦炭平均孔径小,比表面积大,抗拉强度高.焦炭抗拉强度随孔隙率和平均孔径增加而降低,平均孔径小于30μm时抗拉强度随比表面积增加而降低,大于30μm时随比表面积减小而降低.焦炭中小孔数量越多抗拉强度越高,大孔数量越多抗拉强度越低.相同反应率下,H2O反应后焦炭中小孔数量增加,比表面积大,有利于保护气孔壁结构,抑制高温抗拉强度的降低.
The pore structure characteristics of coke reacted with CO_2 or H_2O were measured by mercury intrusion porosimetry, and the effects of porosity, average pore diameter, specific surface area and pore size distribution on the high temperature tensile strength of coke were studied.The porosity and average pore size of coke increased with the reaction rate While the average pore size is less than 30μm, the gasification reaction is mainly pore-forming, the specific surface area increases first and then decreases with the increase of the reaction rate, and mainly increases the reaming when the pore diameter is larger than 30μm and decreases with the increase of the reaction rate.Compared with CO_2, H 2 O coke has small average pore diameter, large specific surface area and high tensile strength.The tensile strength of coke decreases with the increase of porosity and average pore diameter.The tensile strength of coke decreases with the increase of specific surface area when the average pore diameter is less than 30μm, The specific surface area decreases and decreases.Cokes in the number of small holes the higher the tensile strength, the larger the number of macropores the lower the tensile strength.At the same reaction rate, the number of coke holes after H2O reaction increases, the specific surface area, Help to protect the stomatal wall structure, inhibit the reduction of high temperature tensile strength.