Utilizing device and method for cold energy in high-purity ammonia preparation process

Abstract

A utilizing device for cold energy in a high-purity ammonia preparation process comprises a cold exchanger, an ammonia cooler, a deep freezer, a liquid nitrogen cold exchanger and an ammonia separator, wherein the cold exchanger is connected with the ammonia cooler through a first pipe, the ammonia cooler is connected with the deep freezer through a second pipe, the deep freezer is connected with the liquid nitrogen cold exchanger through a third pipe, and the liquid nitrogen cold exchanger is connected with the ammonia separator through a fourth pipe. The ammonia separator is provided with two outlet ends, a first outlet end is communicated with an inlet end of a longitudinal channel of the cold exchanger through a fifth pipe, and a second outlet end is connected with a high-purity liquid ammonia discharging pipe. The cold energy generated in the prior art can be fully utilized to reduce energy consumption on the basis of the technical scheme disclosed in the patent ZL 2009100662709.3, the cold energy can almost reach 50%-85% of the required cold energy for the whole refrigeration, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of energy saving, and relates to an energy utilization device and method in the synthesis of high-purity ammonia, in particular to a cooling capacity utilization device and method in the high-purity ammonia preparation process. Background technique [0002] The development of modern microelectronics and optoelectronics industries has a great impact on nitrides, especially gallium nitride (GaN) and silicon nitride (SiN) 3 N 4 ) put forward higher quality requirements. In the preparation of high-quality nitrides, it is necessary to use high-purity ammonia (high-purity ammonia), usually the purity of high-purity ammonia needs to be above 99.9999%. Chinese patent ZL2009100662709.3, titled "Three-step Integrated Method for Preparation of High-Purity Ammonia by Ammonia Catalytic Cracking, Hydrogen and Nitrogen Purification, and Ammonia Synthesis", discloses a new method that is different from the traditional method of obt...

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Problems solved by technology

[0005] 3) The hydrogen-nitrogen mixture separated from the liquid ammonia needs to re-enter the synthesis tower, and the hydrogen-nitrogen mixture just separated also contains a considerable amount of cooling capacity, which has not been fully utilized

[0006] 4) In the process of manufacturing high-purity ammonia, a considerable amount of nitrogen is consumed, which is mainly used for the regeneration of the purification system or the purging of pipelines and containers. These nitrogen are often obtained by gasification of liquid nitrogen, and liquid nitrogen is a very A good cold source, and the liquid nitrogen cold source has not been fully utilized

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