Device and process for stilling ammonia with negative pressure

Abstract

The invention discloses a device and process for stilling ammonia with negative pressure, and belongs to the ammonia stilling technology. The device comprises an ammonia stilling tower, a total condenser, an ammonia cooler, a reflux tank, and an ammonia water reflux pump, which are connected in sequence; one path of the outlet end of the ammonia water reflux pump is connected with the ammonia stilling tower and while the other path of the outlet end of the ammonia water flux pump is used for transferring to the outside; the reflux tank, a non-condensable gas cooler and a vacuum injection pump form a circulation loop; and the vacuum injection pump is also connected with a gas pipeline. The process comprises the following steps of: performing ammonia stilling for vacuum circulating ammonia water; cooling the ammonia; transferring the obtained ammonia water into the reflux tank; cooling the non-condensable gas; transferring into the reflux tank to circulate under the effect of the vacuum injection pump; refluxing the first part the ammonia water produced in the reflux tank, transferring the second part of the ammonia water to the outside as a finished product, and circulating the third part of the ammonia water as circulating liquid; and then feeding the un-absorbed tail gas into the gas pipeline. With the adoption of the device and process for stilling ammonia with the negative pressure, the vacuum condition for negative-pressure ammonia stilling can be effectively realized, so that the negative-pressure operation can be carried out; in addition, the quality of ammonia is improved, the operation cost is low, the labor intensity is small, and other characteristics are also brought.

Description

technical field [0001] The invention relates to an ammonia distillation technology, in particular to a negative pressure ammonia distillation device and process that can be widely used in coking and chemical industries. Background technique [0002] In the coking industry, the ammonia distillation process is gradually being replaced by negative pressure ammonia distillation from normal pressure ammonia distillation. The heat of negative pressure ammonia distillation is reduced, and the energy saving is remarkable. According to calculations, compared with normal pressure ammonia distillation, negative pressure ammonia distillation of the same scale can save energy consumption by 40%-60%, which is very conducive to energy saving and cost reduction for enterprises; clean production, reducing waste water generation, general conditions Under the circumstances, when using direct steam distillation, a large amount of steam condensed water will enter the wastewater system, which wil...

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Problems solved by technology

[0004] Currently, there is no good solution

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