A process and device for resource utilization of ammonia water

Abstract

The process and device for resource utilization of ammonia water provided by the present invention, in order to ensure that the by-product ammonia water in the ammonia distillation section can be effectively resourced and utilized, aiming at the low and unstable ammonia concentration in the tail gas absorption tower in the original process, mainly through Change the circulation extraction mode of the absorption tower and replace the absorption liquid with soft water to improve the quality of ammonia water, replenish the concentrated liquid from the secondary absorption to the primary absorption tower as the absorption liquid, and replenish the concentrated liquid from the primary absorption tower to the ammonia distillation tower as the tower Top reflux, in order to optimize the ammonia distillation process. In the ammonia distillation system, only one side of the condensed ammonia water return tank is used to drain the concentration, which thoroughly and effectively controls the on-site odor caused by the irregular concentration of the two-stage tail gas absorption tower and the instability of the concentration of the two streams of ammonia water, and at the same time solves the concentration of ammonia water in the two-stage absorption liquid If the tower is too high, the packing tower will be blocked, and the pressure drop in the tower will increase, which will cause the liquid flooding in the tower, the tower will be flooded and other failure conditions, and overcome the problem that the concentration of ammonia water is too low to achieve resource recycling, so as to meet the use requirements of flue gas desulfurization and denitrification , to further reduce production costs.

Description

technical field [0001] The invention relates to a high-concentration ammonia nitrogen oxidation liquid stripping deammonization technology for recovering ammonia water, in particular to a process technology for resource utilization of ammonia water. Background technique [0002] Glyphosate crystallization liquid is a kind of wastewater produced in the process of producing glyphosate technical. Its composition is complex, mainly containing organic phosphorus, organic nitrogen and sodium chloride. Direct discharge will inevitably cause serious pollution to the environment. Our company currently The organic wastewater is treated by wet catalytic oxidation technology, the surface is yellow, the pH value is 8-9, and the ammonia nitrogen content of the oxidized wastewater is 4000-6000ppm. [0003] The ammonia nitrogen oxidation wastewater treatment process mentioned in the patent CN201720781613.2 uses a stripping deammonization tower to remove ammonia nitrogen. The tower top conde...

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Problems solved by technology

[0005] The purpose of this technical invention is to propose a scheme for the utilization of ammonia water resources, which mainly solves the problems of the primary tail gas absorption tower, the The concentrated liquid from the tail gas absorption tower directly enters the dilute ammonia water together with the condensate ammonia water to transfer tanks, resulting in problems such as low concentration of dilute ammonia water (6% to 8%) and unstable concentration. The optimization process proposed by the present invention overcomes this technical difficulty , so that the concentration of ammonia water is stabilized in the range of 10%-15%, and it is produced into dilute ammonia water for export, so as to achieve the purpose of resource utilization

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