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Separation and recycling device and recycling method for methane and argon in synthetic ammonia relief gas

A technology of degassing, separation and recovery of synthetic ammonia, which is applied in refrigeration and liquefaction, lighting and heating equipment, liquefaction, etc. It can solve the problems of energy waste and environmental pollution, and achieve the effect of easier energy matching, high purity and small consumption

Active Publication Date: 2012-04-18
HANGZHOU ZHONGTAI CRYOGENIC TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the waste of energy and environmental pollution in the prior art, and the shortcomings of the above-mentioned synthetic ammonia offgas treatment method, the present invention provides a method for separating and recovering methane and argon in the synthetic ammonia offgas by using a mixed refrigerant and nitrogen double refrigeration system The device and method can obtain high-purity methane and argon, and simultaneously can obtain relatively high-purity nitrogen and hydrogen

Method used

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  • Separation and recycling device and recycling method for methane and argon in synthetic ammonia relief gas
  • Separation and recycling device and recycling method for methane and argon in synthetic ammonia relief gas
  • Separation and recycling device and recycling method for methane and argon in synthetic ammonia relief gas

Examples

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Embodiment 1

[0033] Separation and recovery device for methane and argon in the purge gas of synthetic ammonia, including cold box, raw gas pipeline, water cooler 8. Water cooler 11. Gas-liquid separator 9, gas-liquid balance tank 10, throttling and pressure reducing valve, purification system connected with raw gas pipeline, refrigeration system for cryogenic separation and step-by-step separation of purge gas The rectification system, the purification system includes the first molecular sieve adsorber 1 and the second molecular sieve adsorber 2, and the purification system is connected with the main heat exchanger 5 through pipelines. Refrigeration system includes mixed refrigerant cycle compressor 3, medium pressure cycle nitrogen compressor 4 and main heat exchanger 5, mixed refrigerant cycle compressor 3, water cooler 8. The gas-liquid separator 9, the gas-liquid balance tank 10 and the main heat exchanger 5 are connected through pipelines, and the medium-pressure circulating nitr...

Embodiment 2

[0038] The method for separating and recovering methane and argon using the device described in Example 1 may further comprise the steps:

[0039] Step a: After mixing the exhaust gas of synthetic ammonia, it passes through a purification system equipped with a first molecular sieve adsorber 1 and a second molecular sieve adsorber 2 to remove trace amounts of ammonia and CO 2 , moisture and other impurities;

[0040] Step b: use the purified purge gas in step a as feed gas into the main heat exchanger 5 for heat exchange, be cooled to a gas-liquid mixed state, and then exit the main heat exchanger 5 and enter the dehydrogenation tower 12, the dehydrogenation tower 12 Most of the hydrogen is separated, and the hydrogen-rich gas containing more hydrogen is throttled and decompressed, and then reheated by the main heat exchanger 5 to leave the cold box, and the hydrogen-poor liquid is obtained at the bottom of the dehydrogenation tower 12, which is sent into methane after throttl...

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Abstract

The invention relates to the technical field of recycling of a synthetic ammonia relief gas, and discloses a separation and recycling device and a recycling method for methane and argon in the synthetic ammonia relief gas. The device comprises a cooling box, a virgin gas pipeline, a water cooler, a gas-liquid separator, a gas-liquid balancing tank, a throttling reducing valve, a purification system, a refrigeration system and a rectifying system, wherein the refrigeration system comprises a mixed refrigerant circulating compressor, a medium-pressure circulating nitrogen compressor and a main heat exchanger; the medium-pressure circulating nitrogen compressor is connected with the water cooler and the main heat exchanger through a pipeline respectively; the rectifying system comprises a dehydrogenation tower, a methane rectifying tower and an argon rectifying tower; and the main heat exchanger, the dehydrogenation tower, the methane rectifying tower and the argon rectifying tower are connected through pipelines. By the device and the method for separating and recycling the methane and the argon from the synthetic ammonia relief gas by utilizing the mixed refrigerant and argon double-refrigeration system, high-purity methane and high-purity argon can be obtained, and nitrogen with relatively higher purity and hydrogen with relatively higher purity can be obtained at the same time.

Description

technical field [0001] The invention relates to the technical field of recovery of synthetic ammonia purge gas, in particular to a device for separating and recovering methane and argon in synthetic ammonia purge gas and a recovery method thereof. Background technique [0002] Liquid methane (LNG) is a high-quality energy source with high calorific value, cleanliness, low combustion pollution, etc., and is easy to transport. It is the preferred fuel for civil gas in Chinese cities in the 21st century. LNG can be used as a high-quality vehicle fuel. Compared with gasoline, it has the advantages of high calorific value, good antiknock performance, complete combustion, low exhaust pollution, long engine life, and reduced transportation costs. Even compared with compressed natural gas, It also has the advantages of high storage efficiency, long journey after adding gas once, low pressure of steel cylinders installed in vehicles, light weight, small quantity, and the construction...

Claims

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Application Information

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IPC IPC(8): F25J3/02F25J5/00
Inventor 杨巧玉
Owner HANGZHOU ZHONGTAI CRYOGENIC TECHNOLOGY CORPORATION
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