炼油厂污水汽提装置结垢原因分析与对策

Cause analysis and countermeasures for refinery sewage water stripping unit scaling

关键词:  污水汽提  处理量  结垢  过滤 

Key words:  sewage water stripping  processing capacity  scaling  filtration

摘要:

介绍了中国石油乌鲁木齐石化分公司的120×10⁴ t/a污水汽提装置在不到一年时间内处理量由最大175 t/h逐步降到140 t/h以下,净化水的水质出现波动的情况。通过检修,发现塔盘、重沸器结垢堵塞现象严重,结垢造成重沸器的管程凝结水进、出口的温差、压差出现降低,重沸器汽提蒸汽量无法提高,致使含硫污水中氨氮不能有效地分离,严重影响净化污水水质。通过实施除油、过滤、注碱等措施后有效地延长了装置的运行周期。 

Abstract:

Because serious scaling phenomenon occurred on the reboiler and tray of the stripping column of 1 200×10³ t/a sewage water stripping unit in PetroChina Urumqi Petrochemical Company, the handling capacity decreased gradually from 175 t/h to below 140 t/h in less than a year, and purifying water quality appeared fluctuating. Scaling leads to temperature and pressure differences of tube condensed water between the inlet and outlet of the reboiler decreased, the amount of stripping steam could not be improved, ammonia and nitrogen in sulfur-bearing wastewater could not be effectively separated, which seriously affected the purification sewage quality. The measures about oil removal, filtration, injection of alkali and so on were adopted to effectively extend operating cycle of the equipment.