Purification method for pressure swing adsorption decarbonized evacuated gas and purification device thereof

Abstract

The invention discloses a purification method for pressure swing adsorption decarbonized evacuated gas and a purification device thereof. The evacuated gas is purified effectively by adding a washingstep behind an original gas evacuating step, carrying out gas-liquid separation on return water of a vacuum pump, controlling the liquid level of a water seal pipe through a U-shaped bend of a separator, ejecting the evacuated gas after gas-water separation from the top of the separator, feeding the evacuated gas into a post-section washing tower and a desulfurizer successively together, feeding the evacuated gas into a washing tower to be washed and purified and adsorbing and purifying acidic gas such as H2S in the evacuated gas by activated carbon, so that the environmental influence is reduced.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a pressure swing adsorption decarburization air purification method and a purification device thereof. Background technique [0002] With the shortage of energy in the world, countries and industries pay more and more attention to the development and utilization of low-grade resources, and countries have higher and higher requirements for environmental governance, making adsorption and separation technology widely used in the steel industry, gas industry, electronics industry, In the petroleum and chemical industry, more and more attention has been paid to it. The major development of adsorbents has laid a technical foundation for the continuous operation of large-scale adsorption and separation processes. Pressure swing adsorption decarburization is used as a gas purification device in the front section of synthetic ammonia production. Gas separation depends on changes in press...

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Problems solved by technology

[0002] With the shortage of energy in the world, countries and industries pay more and more attention to the development and utilization of low-grade resources, and countries have higher and higher requirements for environmental governance, making adsorption and separation technology widely used in the steel industry, gas industry, electronics industry, In the petroleum and chemical industry, more and more attention has been paid to it. The major development of adsorbents has laid a technical foundation for the continuous operation of large-scale adsorption and separation processes. Pressure swing adsorption decarburization is used as a gas purification device in the front section of synthetic ammonia production. Gas separation depends on changes in pressure. To achieve adsorption and regeneration, the vacuum pump is used to draw negative pressure to regenerate the adsorbent. During the process of analysis and evacuation, a large amount of venting air (reverse venting and pumping air) will be generated. The venting air contains high concentrations of CO2, H2S, etc. If acid gas is not purified and recovered, it will not only cause environmental impact, but also cause corrosion to peripheral equipment

[0003] The existing reverse venting pipeline of the pressure swing adsorption production device is directly discharged to the sky, which cannot be effectively purified and recycled. The direct venting not only causes the surrounding environmental pollution, but also affects the safe operation of the equipment due to the corrosiveness of the acidic gas in the vented air. There are certain safety hazards; and the reverse deflation and air pumping are not discharged together; and when the existing PSA replaces the activated carbon, it must be vented on site and the vacuum pump returns to the water short circuit, which has a certain impact on the environment. The return water of the vacuum pump is directly discharged back to the circulating water (without gas recovery), which not only has some impact on the surrounding environment of the discharge, but also has some impact on the water quality of the circulating water (the pH value is weakly acidic). Therefore, to solve this category The issue appears to be particularly important

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