Ammonia distillation system

Abstract

The invention discloses an ammonia distillation system which comprises an ammonia distillation tower, a mixer, a first alkali tank and a second alkali tank, the first alkali tank is used for collecting alkali liquor flowing out of a desulfurization tower, a part of solution in the first alkali tank enters the mixer and is mixed with ammonia water to be treated to flow into the ammonia distillation tower, and the other part of solution in the first alkali tank flows back to the desulfurization tower; the second alkaline tank is filled with an alkaline solution, the concentration of the alkaline solution is higher than that of the solution in the first alkaline tank, the second alkaline tank is communicated with the main pipe through a first pipe, one end, close to the second alkaline tank, of the first pipe is higher than one end, close to the main pipe, of the first pipe, and a flow switch is arranged on the first pipe. The end, close to the second alkali tank, of the first pipe is higher than the end, close to the output pipe main pipe, of the first pipe, when the flow switch is turned on, under the action of gravity, an alkali solution in the second alkali tank can directly flow downwards to be mixed with a solution in the output pipe, and no extra power needs to be provided for promoting flowing of the alkali solution.

Description

technical field [0001] The invention relates to the field of residual ammonia water treatment, in particular to an ammonia distillation system. Background technique [0002] Most of the ammonia water formed in the initial cooling process of coke oven gas is used as circulating ammonia water, and the excess part is discharged outside, and the discharged part is called residual ammonia water. The residual ammonia water contains harmful impurities such as coal distilled oil, phenol, ammonia, carbon dioxide and hydrogen sulfide, as well as a small amount of germanium-containing compounds, which is the main source of coking industrial wastewater. The remaining ammonia water needs to be treated in three sections: oil removal, ammonia distillation and biochemical treatment, and then discharged after reaching the standard. [0003] In the ammonia distillation process, the ammonia distillation tower is often used to treat the ammonia water. The working principle and function of the ...

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Problems solved by technology

However, it is difficult for the metering pump to accurately control the amount of high-concentration sodium hydroxide solution, which will easily lead to poor conversion of fixed ammonium salts into volatile ammonium salts, and crystallization in the ammonia distillation tower will cause blockage inside the ammonia distillation tower, which is not conducive to ammonia distillation The operation is carried out; the fluctuation of the amount of alkali will also cause the fluctuation of the ammonia nitrogen of the ammonia distillation wastewater. Not only can the ammonia distillation wastewater not be reused, but also need subsequent further treatment to meet the standard, and the steps are cumbersome

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