65%发烟硫酸装置的技术改进与操作要点

Revamping and operating points of 65%oleum plant

介绍了淄博建龙化工有限公司蒸汽加热法生产液体三氧化硫和65%发烟硫酸工艺流程、技术改进及操作要点。重点探讨了蒸发器进、出口酸浓控制、产品酸储运装卸、22%发烟硫酸和液体三氧化硫混合等操作要点。该装置技术可靠、运行稳定,充分利用了低温位热能回收系统副产低压蒸汽资源,各项工艺指标基本达到或超过设计值,液体三氧化硫最大产量达到60t/d,65%发烟硫酸最大产量达到105t/d,生产1t65%发烟硫酸消耗0.4MPa、150℃低压蒸汽约0.33t。

The process, revamping and operating points of liquid sulphur trioxide and 65% oleum production by steam heating method in Zibo Jianlong Chemical are described. Some operating points are focused on, such as acid concentration control at the inlet and outlet of evaporator, storage and handling of product acid, and mixing of 22% oleum with liquid sulphur trioxide. The plant has reliable technology and stable operation and fully utilizes byproduct low-pressure steam from low-temperature heat recovery system. Every operation index reaches or exceedes design value. The maximum production of liquid sulphur trioxide reaches 60 t/d and maximmn production of 65% oleum reaches 105 t/d, and 0. 4 MPa, 150℃ low-pressure steam consumption per ton 65% oleum is about 0. 33 t.