A device and method for producing ammonia water using a purge system of synthetic ammonia

Abstract

The invention discloses a device and method for producing ammonia water by utilizing a gas release system of synthetic ammonia. The device comprises: an ammonia absorption tower connected to the front-end ammonia synthesis system for absorbing the ammonia synthesized by the front-end ammonia synthesis system; an ammonia stripping tower , it communicates with the ammonia absorption tower through the first pipeline and the second pipeline, and its side wall is provided with: a circulation pipeline; an ammonia water tank, which communicates with the ammonia absorption tower through the third pipeline, and is used to produce ammonia water of different concentrations; The ammonia water heat exchanger is used to exchange heat for the substances in the first pipeline and the second pipeline; the ammonia water water cooler is arranged on the first pipeline; and the ammonia water reboiler is arranged on the circulation pipeline. The device and method of the invention reduce the consumption of medium-pressure steam in the purge system, achieve the effect of saving energy and reducing consumption, stabilize system operation, and increase ammonia water products.

Description

technical field [0001] The invention belongs to the technical field of synthetic ammonia, and in particular relates to a device and method for producing ammonia water by utilizing a gas release system of synthetic ammonia. Background technique [0002] Synthetic ammonia refers to the direct synthesis of ammonia from nitrogen and hydrogen under the action of high temperature, high pressure and catalyst. In chemical plants, synthetic ammonia can provide raw materials for subsequent production. It is the main source of chemical fertilizers, refrigerants and chemical raw materials, and plays an important role in production and operation. . [0003] In the ammonia synthesis plant, a large amount of air is added to the front-end reforming system, and the inert gas in the air does not participate in any reaction, and eventually accumulates in the synthesis loop, which not only increases the power consumption of the synthesis gas compressor, but is also detrimental to the ammonia sy...

AI Technical Summary

Problems solved by technology

Usually, the purge gas first enters the ammonia absorption tower and is recovered in the form of ammonia water to generate ammonia water with a concentration of 18%-19%, and then sends the generated ammonia water to the ammonia stripping tower for heating and stripping with medium-pressure steam to recover The ammonia gas is cooled and enters the ammonia water tank. In order to ensure that the ammonia content in the purge gas at the outlet of the ammonia absorption tower is qualified, two tons of stripping steam is consumed per hour, and stripping temperature fluctuations often occur during operation, which affects the steam Improve the effect

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