Abstract:

This paper analyzed the disadvantages of conventional ammonia stripping process by steam and described the improvement of ammonia stripping by heat transfer oil,by tubular furnace and by negative pressure from waste flue gas heat.The technologies of heat pipe,coke oven waste flue gas and coal water heat exchanger are successfully unitized for 800 000t/a coke production system,by which the waste water treatment cost can be reduced by 40%,stilled water amount can be reduced by 25%,the quality of treated water can be improved so that it’s beneficial to the waste water reutilization and zero discharge of waste water.