Coking residual ammonia water ammonia distillation process equipment and improved method

Abstract

The invention provides coking residual ammonia water ammonia distillation process equipment and an improved method. The improved method is characterized in that ammonia steam containing NH3, H2S, HCN and other components, which are discharged from the top of an ammonia distillation tower, is pressurized by a first-stage heat pump, is fed into an acid pickling tower for pickling, ammonia removing and demisting so as to obtain ammonia-removed secondary steam; medium pressure steam supplemented for ammonia distillation is injected by a steam injector and is mixed with part of the secondary steam, and the mixed steam is guided to the lower part of an ammonia distillation tower and is used for ammonia water ammonia distillation; and part of secondary steam is pressurized by using a second-stage heat pump, is fed into a reboiler and exchanges heat with ammonia distillation wastewater and is used as a hot source of the reboiler for generating steam. Compared with the prior art, the improved method has the beneficial effects that the ammonia steam at the top of the ammonia distillation tower is subjected to adiabatic compression by the first-stage heat pump, so that the temperature and pressure of the ammonia steam are increased, ammonia in the pressurized ammonia steam is removed by an acid pickling method, so that the steam without ammonia can serve as secondary steam to be recycled in the ammonia distillation process, and the consumption of steam required for the residual ammonia water ammonia distillation is reduced.

Description

technical field [0001] The invention relates to the technical field of treating coking residual ammonia water, in particular to a process equipment and an improved method for distilling ammonia from coking residual ammonia water. Background technique [0002] The raw coal gas produced in the coking process contains 300-450g / Nm 3 water vapor. Raw coal gas is sprayed and cooled by circulating ammonia water and cooled by the gas primary cooler. The water vapor in the raw gas is condensed into water as the gas cools and enters the circulating ammonia water, and the amount of circulating ammonia water also increases accordingly; the part of ammonia water added in the circulating ammonia water (called The remaining ammonia water) is sent to other devices for treatment to remove harmful impurities such as ammonia, phenol and COD in the remaining ammonia water, and the treated wastewater meets the corresponding national wastewater discharge standards before being discharged. [00...

AI Technical Summary

Problems solved by technology

The splitter and ammonia cooler also need to consume a lot of circulating water when condensing ammonia

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