Ammonia distillation process

Abstract

The invention relates to an ammonia distillation process, which adopts that the distillation process of volatile ammonia and the process of decomposition distillation of fixed ammonia are performed in an ammonia distillation tower, and comprises the following concrete process: raw material ammonia water is respectively subjected to water stripping and wastewater heat exchange and then is sent into the top of the ammonia distillation tower; the upper part of the ammonia distillation tower is used for the distillation of the volatile ammonia, components such as NH3, H2S, CO2 and the like, of the volatile ammonia dissolved in the ammonia water are evaporated under the distillation of steam, and ammonia steam is cooled and condensed to be between 5 and 20 percent through an ammonia partial condenser and then is sent for subsequent treatment; stripping water is drawn at an intermediate tower breaking tray of the ammonia distillation tower, performs heat exchange with the raw material ammonia water, is sent into a one-stage cooler for cooling, and then is sent into an ammonia washing device for ammonia washing; and after tar in ammonia distillation wastewater at the bottom of the ammonia distillation tower is separated, the ammonia distillation wastewater performs heat exchange with the raw material ammonia water, is cooled in a wastewater cooler and then is sent into a biochemical device for treatment. The process adopts a structure that a volatile ammonia tower and a fixed ammonia tower are integrated into one, and has the advantages of reasonable process, short flow, and small land occupation.

Description

technical field [0001] The invention relates to an ammonia distillation process, in particular to an ammonia distillation process carried out in an ammonia distillation tower by adopting a volatile ammonia distillation process and a decomposed and fixed ammonium distillation process. Background technique [0002] The ammonia contained in the gas is a harmful substance. When the gas without deammoniation is used for steelmaking and civil use, it will not only reduce the quality of steel, but also the nitrogen dioxide produced by combustion will damage the environment and affect human health. Therefore, in order to meet the needs of the metallurgical industry and town gas, and reduce the pollution to the atmosphere after gas combustion and the harm to human health, it is necessary to remove the ammonia in the gas. [0003] The water washing ammonia process is a widely used coal gas deammonization process in my country's coking industry. Part of the rich ammonia water after amm...

AI Technical Summary

Problems solved by technology

But on the whole, the process is still not perfect: when one ammonia distillation tower is overhauled, it can only rely on the other ammonia distillation tower to increase the load to maintain production, resulting in an increase in the discharge wastewater index, which brings difficulties to biochemical treatment

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