A low-pressure ammonia synthesis process

A technology of ammonia synthesis and ammonia synthesis tower, which is applied in the field of ammonia synthesis, can solve the problems of low net value of exported ammonia, low utilization rate of nitrogen and hydrogen, and achieve the effects of reducing energy consumption, improving utilization rate, and improving stability

Active Publication Date: 2019-09-24
绿氨(北京)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the outlet ammonia net value is not high and the utilization rate of nitrogen and hydrogen is low, and then provide a high outlet ammonia net value, high nitrogen and hydrogen utilization rate, low energy Low-pressure ammonia synthesis process with low energy consumption and stable operation

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  • A low-pressure ammonia synthesis process
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  • A low-pressure ammonia synthesis process

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Embodiment 1

[0057] The present embodiment provides a kind of low-pressure ammonia synthesis process, comprising the following steps:

[0058] 1) Carry out cryogenic air separation to air, obtain nitrogen and oxygen, described oxygen and natural gas carry out pure oxygen autothermal conversion, obtain containing CO and H 2 The mixed gas; moreover, containing CO and H 2 The mixed gas is passed into the waste heat boiler to recover heat, and high-pressure steam is obtained, which is used to pressurize the raw material gas for the synthesis of ammonia; finally, the mixed gas is separated by electrolysis of water to obtain hydrogen; the hydrogen and nitrogen Mixed to form synthetic ammonia raw material gas, where S2 <10ppm, the molar ratio of hydrogen to nitrogen is 1.7:1;

[0059] 2) the above-mentioned synthetic ammonia raw material gas is 5000h with space velocity -1 The primary ammonia synthesis is carried out in the first ammonia synthesis tower filled with iron-based catalyst, the synt...

Embodiment 2

[0069] The present embodiment provides a kind of low-pressure ammonia synthesis process, comprising the following steps:

[0070] 1) Carry out cryogenic air separation to air, obtain nitrogen and oxygen, described oxygen and natural gas carry out pure oxygen autothermal conversion, obtain containing CO and H 2 The mixed gas; moreover, containing CO and H 2 The mixed gas is passed into the waste heat boiler to recover heat, and high-pressure steam is obtained, which is used to pressurize the raw material gas for the synthesis of ammonia; finally, the mixed gas is separated by electrolysis of water to obtain hydrogen; the hydrogen and nitrogen Mixed to form synthetic ammonia raw material gas, where S2 <10ppm, the molar ratio of hydrogen to nitrogen is 1.5:1;

[0071] 2) The above-mentioned synthetic ammonia raw material gas is 6000h with space velocity -1 The primary ammonia synthesis is carried out in the first ammonia synthesis tower filled with iron-based catalyst, the synt...

Embodiment 3

[0081] The present embodiment provides a kind of low-pressure ammonia synthesis process, comprising the following steps:

[0082] 1) Carry out cryogenic air separation to air, obtain nitrogen and oxygen, described oxygen and natural gas carry out pure oxygen autothermal conversion, obtain containing CO and H 2 The mixed gas; moreover, containing CO and H 2 The mixed gas is passed into the waste heat boiler to recover heat, and high-pressure steam is obtained, which is used to pressurize the raw material gas for the synthesis of ammonia; finally, the mixed gas is separated by electrolysis of water to obtain hydrogen; the hydrogen and nitrogen Mixed to form synthetic ammonia raw material gas, where S2 <10ppm, the molar ratio of hydrogen to nitrogen is 2.5:1;

[0083] 2) the above-mentioned synthetic ammonia raw material gas is 4000h with space velocity -1The primary ammonia synthesis is carried out in the first ammonia synthesis tower filled with iron-based catalyst, the synth...

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Abstract

The invention provides a low-pressure ammonia synthesis process, comprising the following steps: 1) performing cryogenic air separation on the air to obtain nitrogen and oxygen, and performing pure oxygen autothermal conversion between oxygen and natural gas to obtain CO and H 2 2) The mixed gas is subjected to electrolysis and water separation to obtain hydrogen; 3) The hydrogen and nitrogen are mixed to form a raw material gas for ammonia synthesis, and the first-level ammonia synthesis is carried out in the first ammonia synthesis tower filled with an iron-based catalyst. The synthesis pressure is 5-7MPa; 4) the mixed gas coming out from the first ammonia synthesis tower enters the second ammonia synthesis tower filled with ruthenium-based catalyst for secondary ammonia synthesis, and the synthesis pressure is 4-6MPa. The invention divides the ammonia synthesis process into two stages, which are carried out under a specific pressure, a specific type of catalyst, and a specific hydrogen-nitrogen ratio raw material gas, which not only meets the requirements of the ammonia synthesis process, ensures the smooth operation of the process, but also improves the net value of ammonia at the outlet of the ammonia synthesis tower and nitrogen and hydrogen utilization.

Description

technical field [0001] The invention belongs to the technical field of ammonia synthesis, and in particular relates to a low-pressure ammonia synthesis process. Background technique [0002] Ammonia is one of the important inorganic chemical products and occupies an important position in the national economy. Except that liquid ammonia can be directly used as fertilizer, nitrogen fertilizers used in agriculture, such as urea, ammonium nitrate, ammonium phosphate, ammonium chloride and various nitrogen-containing compound fertilizers, all use ammonia as raw material. Therefore, synthetic ammonia plays an important role in the national economy. The world's annual synthetic ammonia output has reached more than 100 million tons, of which about 80% of ammonia is used to produce chemical fertilizers, and 20% is used as raw materials for other chemical products. [0003] As we all know, synthetic ammonia is directly synthesized by nitrogen and hydrogen under high temperature, high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/04B01J23/652
Inventor 江莉龙林建新倪军林炳裕林科
Owner 绿氨(北京)技术有限公司
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