尼龙66聚合反应器排汽回收利用技术改造

Technical innovation of exhaust steam recovery unit for nylon 66 polymerization reactor

介绍了尼龙66连续聚合纺丝生产工艺路线,改造前反应器排放大量的过热蒸汽直接进入大气,造成能源浪费和环境污染.通过技术改造,新增饱和蒸汽塔、过滤器等废汽回收利用装置,根据高压蒸汽减温减压装置原理,将反应器排放的1.85 MPa,245℃过热蒸汽在饱和塔内进行喷淋,经过滤器除杂转换为0.8～1.0 MPa饱和蒸汽,作为浓缩槽热源;浓缩槽排放蒸汽的余热改造后作为第三温水系统和冬季取暖的热源,排汽余热得到充分利用.运行过程中,通过稳定控制反应器压力、保持反应器排汽阀的喷淋水流量和压力稳定等工艺条件,定期清理疏水阀等,可有效预防管路和设备堵塞.改造后,装置运行稳定,能耗降低,尼龙66聚合物相对黏度的均匀性和原丝一等品率均有所提高.

The continuous polymerization-spinning process of nylon 66 was introduced.A large quantity of superheated steam was exhausted directly from the reactor into air,causing the energy waste and environment pollution.A technical innovation was performed on the reactor by adding an exhaust steam recovery unit including a saturated steam column and a filter.Based on the mechanism of high-pressure steam conditioning device,the 1.85 MPa,245 ℃ superheated exhaust steam was transformed into O.8-1.0 MPa saturated steam after the spray and impurity filtration and was used as the heat source for concentration tank after innovation; the heat of the exhaust steam from the concentration tank was treated and used as the heat source for the third warm water system and winter heating system; hence,the heat of exhaust steam was fully reutilized.The block of pipelines and equipments can be efficiently prevented by steadily controlling reactor pressure,spray water flow rate and steam exhaust valve pressure and regularly cleaning water drain valve.The plant operated steadily with lower energy consumption,the relative viscosity uniformity of nylon 66 rose and the top-quality rate of as-spun fiber increased after the innovation.