Properties of tuyere coke was studied in detail in order to know the degradation of the cokein BF.The tuyere coke was screened to know the particle size distribution.The test adopted particlecoke method to measure the carbon consumption rate.The particle size degradation represents thephysical property change of tuyere coke,the increase of CRI represents the chemical property change .Then the degradation degree was given.The paper pointed out that it will be very helpful to increasethe hearth active degree if proper anisotropic structure is selected according to the specific situation ofBF.%为深入了解焦炭在高炉中的劣化情况，详细研究了风口焦的性状。利用风口取样技术取出高炉风口焦炭，对风口前不同位置的焦炭进行筛分，确定其粒度分布及不同位置不同粒度风口焦的反应性。用粒度的降解度表示风口焦物理性质的变化，用风口焦反应性增加的倍数表示风口焦炭的化学性质变化，从而定量的给出了口焦炭劣化度的公式。文章指出提高入炉焦炭的高温性能和各向异性含量，控制碱金属的入炉量及采用合理的造渣制度来控制炉渣碱度等技术措施，可以减缓风口焦炭劣化，提高炉缸活跃程度。
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