介绍了炼油厂焦化装置油品残留物(渣油)制成碳化产品的工艺方式。分析了焦化装置焦化塔底进料切换用波纹管密封四通球阀的工作原理、结构特点和使用效果。该波纹管四通球阀已获得国家专利(专利号:ZL200920113934.0)。 The process of making carbonized products from oil residue (residue) of coking plant in refinery is introduced. The working principle, structural characteristics and application results of bellows sealed four-way ball valve for coking tower bottom feed switching are analyzed. The bellows four-way ball valve has obtained national patent (patent number: ZL200920113934.0).