A tumor was found on the inner wall of a natural gas to methanol steam reformer tube,which not only protruded from the inner wall but also grew inside the tube,causing a serious impact on the tube performance.To address this rare phenomenon,the tissue and composition of the tumor were observed and analyzed by means of optical microscopy,scanning electron microscopy and energy spectrometry.The results show that the nature of the lump is an oxide of Cr and Fe,and there is a transition zone between the tumor and the matrix that is different from that of the conventional oxide,and many carbon-rich loose structures are observed inside the tumor.It is speculated that the formation mechanism of the tumor is related to the reduction-oxidation interactions.
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