The firebrick of secondary reformer dome has been turned up crack and breakage for many times maintenance,its service life is too short.

• 乌石化化肥厂第二套合成氨装置的二段转化炉拱顶自投运以来,拱顶砖经多次检修,仍出现裂纹和破碎现象,使用寿命过短。