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搗固焦高溫氣化反應特性

Gasification reaction characteristics of stamp charging cokes at high temperature

  • 摘要: 通過模擬高爐實際條件,研究了溫度、富堿條件等對五種搗固焦氣化反應的影響,并結合光學組織和微觀氣孔結構分析了搗固焦在高溫下的碳溶反應規律。實驗結果表明,反應溫度升高和富堿均能較大地提高搗固焦氣化反應失碳率。不富堿時,搗固焦氣化反應失碳率隨溫度升高先緩慢增長而后急劇升高,在1000℃以下時反應較少;富堿后,四種搗固焦失碳率隨溫度升高先急劇升高而后趨于平穩,在1100℃時已達到最大值。搗固焦內部閉氣孔比例較大,大氣孔較少,微小氣孔較多,局部存在盲腸狀氣孔,反應后大氣孔和貫穿孔數量增加。除反應性最低的搗固焦A外,其他四種搗固焦以基礎各向異性和粗粒鑲嵌結構為主,在1000℃和1100℃時抗堿金屬侵蝕能力較差.

     

    Abstract: The influences of temperature and alkali metals on the gasification reactions of 5 kinds of stamp charging cokes were investigated by simulating the real conditions of blast furnaces. The carbon solution loss reaction regularity of the cokes was also analyzed by testing the optical textures and microscopic pore structures. The results show that the mass loss ratio of the cokes can increase quickly by rising the reaction temperature or enriching alkalis. Without alkalis,the mass loss ratio of the cokes increases slowly firstly and then quickly,and it is low when below 1000℃; but with alkalis,the mass loss ratio of 4 kinds of stamp charging cokes increases quickly firstly and gently then,and it reaches the maximum at 1100℃. The cokes contain more closed pores,more small pores,less large pores,and a few cecum-like pores locally. The quantity of large pores and connected pores in the cokes increases after the reactions. Except stamp charging coke A,whose coke reactivity index is the lowest,the other 4 kinds of stamp charging cokes are mainly basic anisotropic and coarse mosaic structures,which are less resistant to alkali metals at 1000℃ and 1100℃.

     

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