煤焦油高效破乳剂在焦化厂循环氨水系统中的应用研究

Application study of high-efficient coal tar demulsifier in circulating ammonia system of coking plant

通过向焦化厂化产车间的循环氨水工段中添加煤焦油高效破乳剂,对破乳剂在煤焦油与循环氨水分离中的应用进行研究,采用循环氨水除油评价、煤焦油脱水评价对破乳剂进行实验室评价,并系统地分析了焦化厂循环氨水系统在添加破乳剂前后发生的变化。由研究表明,煤焦油高效破乳剂可有效作用于循环氨水中的油水界面,实现乳液破乳及促进煤焦油与循环氨水的分离,从而使得循环氨水中含油量由>400mg/L降至均值222.7mg/L,中间槽煤焦油水分由6%~9%降至3%以下,蒸氨废水COD由(7000~8000)mg/L降至均值5271.24mg/L,且减少了焦炉循环氨水喷头堵塞情况的发生,降低了废水生化处理的压力。

By adding coal tar high-efficiency demulsifier to circulating ammonia water in coking plant,the application of demulsifier in separation of coal tar and circulating ammonia water was studied,adopting the coal tar removal in circulating ammonia water evaluation and the coal tar dehydration evaluation to evaluate the laboratory,and the changes of the circulating ammonia system of coking plant before and after the addition of demulsifier were systematically analyzed.The research showed that:the high-efficiency demulsifier of coal tar can effectively act on the oil-water interface of circulating ammonia water to achieve emulsion demulsification and promote the separation of tar and ammonia water,after that the oil content of circulating ammonia water drops from>400 mg/L to the average value of 222.7 mg/L,the water content of middle groove coal tar decreases from 6%~9%to less than 3%,the COD of ammonia-vapor waste water decreases from 7 000~8 000 mg/L to an average value of 5271.24 mg/L,also,the blockage frequency of the coke oven ammonia nozzle is reduced,which reduces the pressure of wastewater biochemical treatment.