Low-concentration ammonia water deamination device and system and application thereof in ammonia water preparation system

Abstract

The invention discloses a low-concentration ammonia water deamination device and system and application thereof in an ammonia water preparation system. The low-concentration ammonia water deamination device disclosed by the invention comprises an inner cylinder, an outer cylinder, a pressurization pipeline and a heat exchanger, wherein a spiral channel is further arranged between the outer cylinder and the inner cylinder. Low-concentration ammonia water contained at the bottom of the outer cylinder is pressurized by the pressurization pipeline and then is sprayed out and atomized through an atomizing nozzle to form droplets, part of ammonia and water are evaporated in an evaporation region of the inner cylinder to form ammonia gas and vapor, and the droplets are separated from the ammonia gas and the vapor by means of the spiral channel, so that ammonia water having a lower concentration is obtained, and a high-efficiency deamination effect is achieved.

Description

technical field [0001] The invention relates to an ammonia water deamination device, in particular to a low-concentration ammonia water deamination device, a system and its application in an ammonia water preparation system, belonging to the field of chemical industry. Background technique [0002] Ammonia is a commonly used substance in industry, but ammonia-containing wastewater is often produced after use. Because ammonia water has a pungent smell, and no matter it is ammonia water or the ammonia gas produced by the volatilization of ammonia water, it is an important source of environmental pollution. Therefore, ammonia-containing wastewater usually needs to be deammonized before being discharged or recycled. [0003] Generally, there are two methods for deammonization of waste ammonia water. One is to blow out the ammonia in waste ammonia water into ammonia gas by air stripping; the other is to evaporate ammonia gas by heating and evaporating. However, when the concent...

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Problems solved by technology

[0004] When using the air stripping method, it is necessary to use a large or a large number of blowers to press a large amount of air into the water body, which consumes a lot of power and produces high-decibel noise

Moreover, it takes time for the ammonia in the water phase to diffuse to the gas-liquid interface. Assuming that the distance between the bubbles is 0.1-1 cm, the diffusion distance of ammonia is 0.05-0.5 cm. This mass transfer distance limits the efficiency of the gas stripping method.

Therefore, the equipment using the air stripping method is bulky, and it is not easy to reduce the concentration of a large amount of ammonia water to the standard allowed by the regulations in a short time

[0005] When using the heating evaporation method, while heating to volatilize ammonia into ammonia gas, a large amount of water vapor will also be produced, so a large amount of heat energy will be lost

In addition, when using the heating evaporation method, the thickness of the water film is about 0.1 to several centimeters, so the time required for ammonia to diffuse from the water body to the gas-liquid interface is longer

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