Purge gas ammonia recycling method and ammonia recycler

Abstract

The invention relates to a purge gas ammonia recycling method and an ammonia recycler. According to the method and the ammonia recycler, an ammonia recycler is arranged between an ammonia synthesis procedure and an ammonia liquid storage tank; the ammonia recycler is multistage; in the ammonia synthesis procedure, the low temperature ammonia liquid discharged by an ammonia separator after the ammonia is cooled is singly conveyed to an upper ammonia liquid inlet pipe of the ammonia recycler, the purge gas flashed and desorbed from the ammonia liquid in the ammonia recycler is mixed with the purge gas flowing bottom up from the ammonia liquid storage tank, and the purge gas with reduced ammonia content is recycled in a constant pressure ammonia recycling tower or a non-power ammonia recycling tower through a wire mesh demister and a purge gas outlet on the upper part of the ammonia recycler; the low temperature ammonia liquid with flashed and desorbed purge gas is discharged from the ammonia recycler via a low temperature ammonia liquid outlet of the ammonia recycler and is conveyed to a low temperature cold exchanger and the ammonia liquid storage tank via an adjusting valve or directly conveyed to the ammonia liquid storage tank; and a purge gas inlet on the lower part of the ammonia recycler is connected with the purge gas outlet of the ammonia liquid storage tank. The purge gas ammonia recycling method and the ammonia recycler in the invention have the advantages of consuming no power and recycling refrigeration capacity of the ammonia liquid.

Description

technical field

[0001] The invention relates to a synthetic ammonia chemical process and supporting equipment. That is, a part of ammonia in the purge gas of liquid ammonia in the ammonia synthesis process is recovered, and a purge gas ammonia recovery method and an ammonia recovery device that can recover the cooling capacity of liquid ammonia. Background technique

[0002] In the existing technology, the ammonia synthesis process of large, medium and small synthetic ammonia plants in my country is equipped with secondary ammonia separation or tertiary ammonia separation. No matter the secondary or tertiary ammonia separation process, there is an ammonia separator after ammonia cooling , In addition to the ammonia separator after ammonia cooling for the secondary ammonia separation, there is also an ammonia separator after the cold exchange or ammonia separator after the water cooler, and there are three kinds of ammonia separators for the tertiary ammonia separation. Most ...

Examples

Embodiment Construction

[0056] A. Recovering method of release gas ammonia:

[0057] see figure 2 , the low-temperature liquid ammonia discharged from the ammonia separator 16 after ammonia cooling in the ammonia synthesis process is sent out separately, the cold liquid ammonia discharged from the ammonia separator 17 after the cold exchange, and the normal temperature liquid ammonia discharged from the ammonia separator 18 after the water cooler are also sent separately, or Send out the mixed liquid ammonia after mixing cold liquid ammonia and normal temperature liquid ammonia, or the ammonia synthesis process still follows the traditional ammonia discharge process, that is, the liquid ammonia discharged from each ammonia separator in the ammonia synthesis process is combined and then sent out, but the released gas ammonia The recovery effect and the cold recovery effect are poor.

[0058] see figure 1 , an ammonia recoverer 23 is added between the ammonia synthesis process and the liquid ammonia...

technical field

[0001] The invention relates to a synthetic ammonia chemical process and supporting equipment. That is, a part of ammonia in the purge gas of liquid ammonia in the ammonia synthesis process is recovered, and a purge gas ammonia recovery method and an ammonia recovery device that can recover the cooling capacity of liquid ammonia. Background technique

[0002] In the existing technology, the ammonia synthesis process of large, medium and small synthetic ammonia plants in my country is equipped with secondary ammonia separation or tertiary ammonia separation. No matter the secondary or tertiary ammonia separation process, there is an ammonia separator after ammonia cooling , In addition to the ammonia separator after ammonia cooling for the secondary ammonia separation, there is also an ammonia separator after the cold exchange or ammonia separator after the water cooler, and there are three kinds of ammonia separators for the tertiary ammonia separation. Most ...

Examples

Embodiment Construction

[0056] A. Recovering method of release gas ammonia:

[0057] see figure 2 , the low-temperature liquid ammonia discharged from the ammonia separator 16 after ammonia cooling in the ammonia synthesis process is sent out separately, the cold liquid ammonia discharged from the ammonia separator 17 after the cold exchange, and the normal temperature liquid ammonia discharged from the ammonia separator 18 after the water cooler are also sent separately, or Send out the mixed liquid ammonia after mixing cold liquid ammonia and normal temperature liquid ammonia, or the ammonia synthesis process still follows the traditional ammonia discharge process, that is, the liquid ammonia discharged from each ammonia separator in the ammonia synthesis process is combined and then sent out, but the released gas ammonia The recovery effect and the cold recovery effect are poor.

[0058] see figure 1 , an ammonia recoverer 23 is added between the ammonia synthesis process and the liquid ammonia...

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