Novel method for recycling ammonia synthesis cold energy in synthetic ammonia system

A technology of cooling capacity recovery and ammonia synthesis, applied in ammonia preparation/separation, etc., can solve the problems of ammonia tank overpressure, liquid ammonia cooling capacity recovery, etc., achieve the effect of reducing ammonia tank pressure, reducing production load, and easy operation

Active Publication Date: 2014-04-30
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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  • Novel method for recycling ammonia synthesis cold energy in synthetic ammonia system

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Embodiment 1

[0028] The specific implementation of the present invention is given below with reference to the accompanying drawings (take a set of 300,000 tons / year synthetic ammonia production equipment as an example):

[0029] Because ammonia synthesis dissolves part of hydrogen and nitrogen in ammonia, the liquid ammonia condensed by the refrigerated condenser also contains part of non-condensable gas. In order to improve the heat exchange effect, the traditional cold recovery process uses the liquid from the ammonia tank outlet of the ice machine. Ammonia exchanges heat with synthetic ammonia and recovers cold energy. The present invention adopts a high-efficiency heat exchanger, changes the previous heat exchange method, and invents a new heat exchange process, 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 pr...

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Abstract

The invention discloses a new method for recycling ammonia synthesis cold energy in a synthetic ammonia system. The method comprises the following steps that gas ammonia delivered by an ice maker is condensed into liquid ammonia via a condenser; the liquid ammonia enters an ammonia storage tank condenser to exchange heat with liquid ammonia discharged from the synthetic ammonia system; the liquid ammonia subjected to heat exchange enters a liquid ammonia storage tank for supplying ammonia to a synthetic ammonia cooler; the liquid ammonia discharged from the synthetic ammonia system is for downstream user use after being reheated. The method disclosed by the invention has the advantages that the problems that the ammonia storage tank in the refrigerating process of a synthetic ammonia device in summer production is overpressured and the environment is polluted by the gas ammonia discharged into the atmosphere are solved; the steam consumption of a steam turbine for driving the ice maker is reduced; the production is stabilized; the benefit is increased.

Description

[0001] technical field [0002] The invention relates to the field of ammonia synthesis and ice machine refrigeration in an ammonia synthesis system, in particular to a new method for recovering the cooling capacity of liquid ammonia in the ammonia synthesis system. Background technique [0003] 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. [0004] 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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