A low-pressure ammonia synthesis process for co-production of methanol
A technology of ammonia synthesis and ammonia synthesis tower, which is applied in the field of ammonia synthesis, can solve the problems of low utilization rate of nitrogen and hydrogen, low net value of exported ammonia, etc., achieve the effect of reducing energy consumption, increasing the net value of exported ammonia, and ensuring the smooth operation of the process
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Embodiment 1
[0058] The present embodiment provides a low-pressure ammonia synthesis process for the co-production of methanol, comprising the following steps:
[0059] 1) Carry out cryogenic air separation to air to obtain nitrogen and oxygen, and the oxygen and natural gas are subjected to pure oxygen autothermal conversion to obtain 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 gas for synthesizing ammonia; then, the CO and H-containing 2 The mixed gas is divided into two streams, one is under the action of a copper-based catalyst to synthesize methanol at 210°C and 6 MPa, the other is separated by electrolysis of water to obtain hydrogen; finally, the mixed gas is separated by electrolysis of water, Obtain hydrogen; mix the hydrogen and nitrogen to form synthetic ammonia raw material gas, wherein S2 <10ppm, the molar ratio of hydrogen...
Embodiment 2
[0070] The present embodiment provides a low-pressure ammonia synthesis process for the co-production of methanol, comprising the following steps:
[0071] 1) Carry out cryogenic air separation to air to obtain nitrogen and oxygen, and the oxygen and natural gas are subjected to pure oxygen autothermal conversion to obtain 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 gas for synthesizing ammonia; then, the CO and H-containing 2 The mixed gas is divided into two streams, one is under the action of a copper-based catalyst to synthesize methanol at 250°C and 5 MPa, the other is separated by electrolysis of water to obtain hydrogen; finally, the mixed gas is separated by electrolysis of water, Obtain hydrogen; mix the hydrogen and nitrogen to form synthetic ammonia raw material gas, wherein S2 <10ppm, the molar ratio of hydrogen...
Embodiment 3
[0082] The present embodiment provides a low-pressure ammonia synthesis process for the co-production of methanol, comprising the following steps:
[0083] 1) Carry out cryogenic air separation to air to obtain nitrogen and oxygen, and the oxygen and natural gas are subjected to pure oxygen autothermal conversion to obtain 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 gas for synthesizing ammonia; then, the CO and H-containing2 The mixed gas is divided into two streams, one is under the action of copper-based catalyst to synthesize methanol at 230°C and 5.5MPa, and the other is subjected to electrolytic water separation to obtain hydrogen; finally, the electrolytic water separation is carried out on the mixed gas , to obtain hydrogen; the hydrogen and nitrogen are mixed to form synthetic ammonia raw material gas, wherein S2 <1...
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