Process for treating residual ammonia water of coking

Abstract

The invention has supplied a processing technique for remained ammonia water, the remained ammonia water enters into ammonia still after heat exchange in heat exchanger, the ammonia gas enters into the condenser on the top of the tower to be cooled and flows back, its characteristics are: use the world-famous software package to do simulating optimal design, the ammonia still has multi-channel compound plate with declined holes, the hot waste water at the bottom enters into the reboiling device, the steam comes back from which to the ammonia still after being heated by heat conducting oil, for supplying heat to ammonia. The invention has advanced the conventional technique direct steam distillation technology for processing remained has stable operation, remarkable effect of energy-saving, decreasing the cost, increasing the products quality as well as the economic income, more importantly, the environmental pollution is reduced greatly by eliminating the direct steam and reducing the quantity of waste water generated.

Description

Technical field [0001] The invention relates to an ammonia distillation technology for concentrating and purifying ammonia water with a relatively low ammonia content, in particular to a method for treating residual ammonia water produced in the coking industry. Background technique [0002] In the production process of the coking industry, some residual ammonia water with low ammonia content (generally 0.3-1.0%) will be produced. The residual ammonia water is the usual name for the water brought in by coking coal and coking chemical combination water in tar sewage, referred to as rich liquid. Generally, the ammonia water is treated by the distillation principle, that is, the ammonia distillation process is used to purify and concentrate it to obtain purified wastewater and product concentrated ammonia water. The remaining ammonia water is highly corrosive in the ammonia distillation process. The traditional ammonia distillation process consumes a lot of steam (200kg of stea...

AI Technical Summary

Problems solved by technology

The remaining ammonia water is highly corrosive in the ammonia distillation process. The traditional ammonia distillation process consumes a lot of steam (200kg of steam per ton of rich liquid), and the product ammonia water has many impurities. Therefore, the coking ammonia distillation process is backward in technology and low in efficiency , high energy consumption, equipment corrosion and environmental pollution have become urgent problems to be solved

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