Method and device for treating residual ammonia water and applying ammonia distillation wastewater to coke quenching

Abstract

The invention relates to a method and a device for treating residual ammonia water and applying ammonia distillation wastewater to coke quenching. In the ammonia evaporation process, under the condition that alkali is not added, residual ammonia water generated by coking is subjected to primary or secondary heating, so that ammonia components contained in the residual ammonia water are evaporatedand escaped, and the concentration of ammonia contained in the residual ammonia water is reduced; the ammonia distillation wastewater with reduced ammonia concentration is used for directly spraying coke quenching to red coke in a closed container, and steam generated by evaporation of coke quenching water is condensed or directly condensed after being utilized by a heat source to obtain condensedliquid in the ammonia evaporation wastewater coke quenching process. The red coke contains a large amount of heat, so that the steam consumption in the whole ammonia distillation process can be reduced, and the energy is saved; through electrochemical treatment, alkali addition in the ammonia distillation process can be omitted, part of refractory organic pollutants and inorganic components suchas sulfides, cyanides and thiocyanides which are harmful to microorganisms in the ammonia distillation wastewater are removed under the action of strong oxidation, and corrosion to a coke quenching system is reduced; and'cyclic utilization 'and'zero emission' of sewage and waste treatment in the coking industry are truly realized.

Description

technical field [0001] The present invention relates to a treatment method and device for coking residual ammonia water, in particular to a method and device for treating residual ammonia water and using ammonia distilled waste water for coke quenching; it involves alkali-free heating and ammonia removal of residual ammonia water and using ammonia distilled waste water to The invention discloses a method and a device for directly spraying red coke in an airtight container for coke quenching, belonging to the fields of chemical industry, energy recycling and environmental protection. Background technique [0002] Coking wastewater mainly comes from the ammonia water produced in the high-temperature carbonization process of coal and the steam condensed water in the ammonia distillation process. The concentration of pollutants in coking wastewater is high and difficult to degrade. At present, the treatment of residual ammonia water from coking mostly adopts the process of "ammo...

AI Technical Summary

Problems solved by technology

However, the closed coke quenching with ordinary water will consume a lot of water resources, and the remaining ammonia water is directly used as quenching water to spray red coke to cool down. The concentration of ammonia and hydrogen sulfide in the non-condensable gas after vaporization and condensation will not only cause It produces a strong pungent smell, and also causes a large amount of ammonia and toxic and harmful pollutants in the coke quenching condensate, which seriously affects the subsequent treatment

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