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
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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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