A method for recovering ammonia synthesis cooling capacity in ammonia synthesis system

A technology of cold energy recovery and ammonia synthesis, applied in the direction of ammonia preparation/separation, etc., can solve the problems of ammonia tank overpressure, liquid ammonia cold energy recovery, etc., to reduce ammonia tank pressure, reduce production load, and improve safety. Effect

Active Publication Date: 2017-02-01
GNSG ANHUI HONG SIFANG
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Problems solved by technology

This process not only solves the problem of recovering the cooling capacity of liquid ammonia in the ammonia synthesis plant, but also solves the problem of overpressure in the ammonia tank of the existing refrigeration plant in summer

Method used

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  • A method for recovering ammonia synthesis cooling capacity in ammonia synthesis system

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Embodiment 1

[0027] Below with reference to accompanying drawing, provide the specific embodiment of the present invention (take the production device of a set of annual output 300,000 tons / year synthetic ammonia as example):

[0028] Since part of the hydrogen and nitrogen are dissolved in the ammonia synthesis and release of ammonia, the liquid ammonia condensed by the refrigerated condenser also contains some non-condensable gas. Ammonia and synthetic ammonia release heat to recover cooling capacity. The present invention adopts a high-efficiency heat exchanger, changes the previous heat exchange method, and invents a new heat exchange process flow, which greatly reduces the pressure of the ammonia tank, that is, reduces the pressure at the outlet of the ice machine, thereby reducing the consumption of the ice machine. To achieve the purpose of energy saving. The specific process is as follows: the gaseous ammonia sent by the ice machine is condensed into 40°C liquid ammonia in the con...

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Abstract

The invention discloses a method for recovering the cooling capacity of ammonia synthesis in an ammonia synthesis system. Gas ammonia sent by an ice machine is condensed into liquid ammonia through a condenser, and enters the condenser of an ammonia storage tank to exchange heat with the liquid ammonia from ammonia synthesis. , the liquid ammonia after heat exchange enters the liquid ammonia storage tank, and is used as ammonia for the synthetic ammonia cooler, and the liquid ammonia from the synthetic ammonia release is reheated and then sent to downstream users for use. The process of the invention not only solves the problem of overpressure of the ammonia storage tank produced in the freezing process of the ammonia synthesis device in summer, and the discharge of gaseous ammonia into the atmosphere to pollute the environment, but also reduces the steam consumption of the steam turbine driving the ice machine, stabilizes the production, and increases the benefit.

Description

technical field [0001] The invention relates to the field of ammonia synthesis and ice machine refrigeration in an ammonia synthesis system, in particular to a method for recovering the cooling capacity of liquid ammonia in the ammonia synthesis system. Background technique [0002] Ammonia synthesis system The ammonia synthesis process utilizes the qualified hydrogen and nitrogen sent from the previous process to react under the conditions of high temperature and high pressure with a catalyst to generate ammonia and release heat. The generated ammonia gas is condensed and separated for use by downstream users, and the unreacted synthesis gas is compressed and returned to the system for further reaction. [0003] The temperature of the liquid ammonia separated by the synthesis system is about -10~-5°C. The cooling capacity carried by the liquid ammonia is different according to the needs of downstream ammonia users. The recovery process of the cooling capacity of ammonia syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/04
Inventor 谢中平费才峰王桂霞王国防王晓华胡慧敏杨义杰杨艳红曹宗元
Owner GNSG ANHUI HONG SIFANG
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