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Novel technology of recovering hydrogen and non-power ammonia in ammonia synthesis purge gas

A technology of synthetic ammonia purge gas and a new process, which is applied in the field of recycling hydrogen in the purge gas of synthetic ammonia and recovery of unpowered ammonia, which can solve the problems of little, etc., and achieve the effects of reducing coal consumption, improving stability, and increasing production

Active Publication Date: 2014-02-26
HUBEI YIHUA CHEMICAL INDUSTRY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the integrated process methods of synthetically released gas membrane separation and recovery of hydrogen, ammonia rectification, and unpowered ammonia recovery.

Method used

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  • Novel technology of recovering hydrogen and non-power ammonia in ammonia synthesis purge gas

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Embodiment 1

[0017] The purge gas from the ammonia synthesis tower is sent to the membrane separation hydrogen extraction device, and the pressure of the membrane separation hydrogen extraction device is controlled at 9-11 MPa. After the ammonia content in the gas is absorbed by the membrane hydrogen extraction inlet water washing tower, the concentration of ammonia water produced is greater than or equal to At 180tt, it is sent to the rectification tower to rectify and recover liquid ammonia. The washed gas (ammonia content ≤ 200ppm) enters the membrane for hydrogen extraction. After hydrogen extraction, when the hydrogen volume concentration reaches 85%, reduce the pressure of the membrane hydrogen extraction device by 1.2 -2.0MPa and send high-concentration hydrogen to the conversion system of the synthesis tower. Part of the tail gas from the membrane separation hydrogen extraction unit is sent to unpowered ammonia recovery as power, and part of it is sent to the three-gas boiler for co...

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Abstract

The invention relates to a novel technology of recovering hydrogen and non-power ammonia in ammonia synthesis purge gas. Synthesis tower purge gas passes through a membrane hydrogen extraction device to recover the hydrogen with high concentration firstly. A part of exhaust gas after the membrane hydrogen extraction step is sent to the non-power ammonia to be used as power, and a part of the exhaust gas after the membrane hydrogen extraction step is sent to a three-gas boiler. Aqueous ammonia after the membrane hydrogen extraction step is sent to an ammonia rectifying tower to be further recovered. The synthesis purge gas in an ammonia synthesis system, ammonia rectification, and spherical tank purge gas are comprehensively recovered and reutilized, thus improving the synthetic ammonia production, and reducing effectively coal consumption and steam consumption in the ammonia synthesis system.

Description

technical field [0001] The invention relates to a new process for recovering hydrogen in the exhaust gas of synthetic ammonia and recovering unpowered ammonia, which belongs to the field of chemical technology. Background technique [0002] Synthetic ammonia purge gas refers to the H dissolved in liquid ammonia when separating liquid ammonia 2 , N 2 、CH 4 And Ar and other gases, when the pressure is reduced, the gas is desorbed from the liquid ammonia. Every ton of NH produced 3 , with an average discharge of 150 m 3 Left and right venting gas (different according to the process and technical level of each factory), according to the relevant data and the technical level of our country's medium and small chemical fertilizers, the average production of one ton of liquid NH 3 , the exhaust gas contains about 120-156 kg of H 2 . Currently, gas separation membranes are used to recover H in the purge gas of synthetic ammonia 2 It is more and more recognized, and most of t...

Claims

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Application Information

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IPC IPC(8): C01C1/12C01C1/04
CPCY02P20/129
Inventor 黄河黎军方娅兰张继东
Owner HUBEI YIHUA CHEMICAL INDUSTRY CO LTD