Ammonia synthesis waste gas recycling device

Abstract

The invention discloses an ammonia synthesis waste gas recycling device. The device comprises a decarbonization adsorber, a first heat exchanger, a second heat exchanger, a third heat exchanger, a liquid ammonia rectifying tower, a liquid ammonia rectifying tower condenser, a methane rectifying tower, a methane rectifying tower condenser, an argon rectifying tower and an argon rectifying tower condenser, wherein the decarbonization adsorber is provided with a gas inlet and a first regenerated gas inlet, the liquid ammonia rectifying tower is provided with a liquid ammonia outlet, the methane rectifying tower is provided with a liquid methane outlet, the argon rectifying tower is provided with a liquid argon outlet and a waste gas outlet; the ammonia synthesis waste gas separating device further comprises a hydrogen pipeline with one end connected with the argon rectifying tower, a hydrogen purifying device connected with the hydrogen pipeline, a nitrogen circulating compressor, a nitrogen expander and a nitrogen supplementing port connected with the nitrogen circulating compressor; the hydrogen purifying device is provided with a hydrogen outlet and a second regenerated gas inlet; the recycling device can be used for extracting liquid ammonia, liquid methane, liquid argon, and high-pure hydrogen with relatively high purity from the waste gas.

Description

technical field [0001] The invention relates to an integrated device capable of recycling waste gas from ammonia synthesis. Background technique [0002] In the production process of synthetic ammonia, waste gas will be discharged to the outside, the most important waste gas is the air in the synthesis tower and the discharge gas of the ammonia tank. At present, there are three traditional treatment methods: one is to divide the waste gas into two streams, Separately washed with water to obtain lower-quality ammonia water, and then burn off the remaining waste gas; the second is to use all the pressure energy in the release gas of the ammonia tank to generate a part of ammonia gas, and then burn off the remaining gas, and simultaneously burn the waste gas of the synthesis tower The low-quality ammonia water is obtained by washing with air, and then the remaining waste gas is burned; the third is to wash all the waste gas with water, and then pass through the previous set of ...

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Problems solved by technology

The above three processes are characterized by complex equipment, different equipment from different manufacturers, lack of a unified design concept, and seamless connection between equipment and equipment. Once a equipment fails, all downstream equipment cannot At the same time, the exhaust gas of synthetic ammonia not only contains ammonia, hydrogen, methane, but also high value-added argon, nitrogen, etc. In the above traditional process, the extraction rate of hydrogen is only 90%, and argon cannot be extracted, while the extraction of ammonia can only be done by Produced in the form of ammonia water or ammonia gas, the recycling rate is very low

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