Device and method for cleaning ammonia distillation system

Abstract

The invention provides a device and a method for cleaning ammonia distillation system. An original waste water heat exchanger, an original waste water cooler, and an original waste water process pipeline, an original remaining ammonia process pipeline, an original old waste water pipeline and an original new waste water pipeline which are connected with the original waste water heat exchanger and the original waste water cooler are utilized, and an auxiliary agent pipe, a waste water pipe, a return pipe, a slag discharge pipe and corresponding valves are additionally arranged; and the cleaning of an ammonia device and the pipelines is realized by opening and closing the different valves. The cleaning time is greatly shortened, the whole cleaning process only requires 12 hours, the loss of ammonium sulfate can be reduced, and the yield of ammonium sulfate is increased; waste liquid after cleaning is directly pumped in a mechanized settle tank for recovery utilization, more than 20 tons of cleaning agent and tar mixture can be recycled during cleaning work every time, and the environmental pollution is prevented while the waste of resources is reduced; and simultaneously, the workload of cleaning and processing can be greatly reduced, and the labor intensity of on-site workers is lightened.

Description

technical field [0001] The invention belongs to the technical field of coking, and in particular relates to a device and method for cleaning ammonia water equipment and pipelines in an ammonia distillation system and recovering cleaning waste liquid. Background technique [0002] The 7-meter coke oven is currently the largest coke oven in China. Although the supporting gas purification system has been gradually improved since the start of construction, some operational problems have gradually appeared in the actual production process. It is mainly manifested in the process of gas purification, a series of problems such as poor heat exchange effect of waste water heat exchanger and waste water cooler, blockage of waste water pipeline and poor ammonia distillation effect of ammonia distillation tower in the ammonia distillation system, so that the amount of steam used in the ammonia distillation process Increase, energy consumption increases, and the operation is not smooth. ...

AI Technical Summary

Problems solved by technology

It is mainly manifested in the process of gas purification, a series of problems such as poor heat exchange effect of waste water heat exchanger and waste water cooler, blockage of waste water pipeline and poor ammonia distillation effect of ammonia distillation tower in the ammonia distillation system, so that the amount of steam used in the ammonia distillation process Increased, increased energy consumption, poor operation

Not only did it cause certain difficulties for the smooth production of the ammonium sulfate process, but also made the import index of phenol cyanide wastewater unqualified, resulting in the export index of phenol cyanide wastewater not meeting the national secondary discharge standards.

For this reason, the ammonia distillation system had to be thoroughly cleaned. However, since the waste liquid after cleaning has no external discharge pipeline, it is connected to a rubber tube and then discharged to the mechanized clarifier tank. The labor intensity of workers, and affect the smooth progress of production, and there will be waste liquid leakage to the ground, which not only causes a waste of resources, but also seriously pollutes the environment

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