PSA decarbonization tail gas desulfurization technology

A desulfurization process, decarbonization tail gas technology, applied in gas treatment, dispersed particle filtration, membrane technology, etc., can solve the problems of purification gas and desorption gas purity and CO2 recovery rate cannot be taken into account, CO2 excess, etc.

Inactive Publication Date: 2019-08-16
ANHUI HUAERTAI CHEM IND
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Problems solved by technology

Chinese patent CN202139057U pressure swing adsorption decarburization device is mainly used in coal head enterprises, the CO2 in the production process of such enterprises is relatively surplus, hydrogen and nitrogen can achieve a high recovery rate, but the recovery rate of CO2 is only about 70%
The purity of purified gas and desorbed gas and the recovery rate of CO2 cannot be balanced

Method used

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  • PSA decarbonization tail gas desulfurization technology

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Embodiment 1

[0026] A PSA decarburization tail gas desulfurization process, comprising the following steps:

[0027] S1, performing pressure swing adsorption on the synthetic ammonia product;

[0028] S2. Discharge hydrogen sulfide and carbon dioxide generated by desorption and analysis to a high-efficiency fine desulfurization device; use a high-efficiency desulfurizer to absorb hydrogen sulfide in the tail gas;

[0029] S3, sending the discharged carbon dioxide to a carbon dioxide recovery device for recovery;

[0030] When the high-efficiency desulfurizer is used for a period of time, the activity decreases, and the desulfurizer should be regenerated.

[0031] In this technical solution, the regeneration of the desulfurizer can continuously replenish the desulfurizer, so that the hydrogen sulfide in the tail gas can be efficiently and stably continuously adsorbed, and then high-purity carbon dioxide can be obtained. In a specific embodiment, high-purity carbon dioxide can be further p...

Embodiment 2

[0038] The difference from Example 1 is that the adsorbent of the pressure swing adsorption includes fruit shell-based activated carbon, and the shell-based activated carbon is modified with metal ions, and the adsorption effect of the shell-based activated carbon is better after modification. Experiments show that: CU 2+ and Mg 2+ The modification effect of mixed metal ions exceeds that of CU 2+ and Mg 2+ Use alone. Therefore, the husk-based activated carbon undergoes CU 2+ and Mg 2+ Mixed metal ion modification. Further experiments showed that the CU 2+ and Mg 2+ When the mixing ratio is 8:2, the adsorption effect of the modified shell-based activated carbon is better.

[0039] Preferably, the high-efficiency desulfurizer is an iron oxide-based high-temperature gas desulfurizer. Experiments show that the regeneration environment parameters of the iron oxide-based high-temperature gas desulfurizer are temperature 400°C and space velocity 3700h -1 , The oxygen conten...

Embodiment 3

[0042] The difference from Example 1 is that the adsorbent of the pressure swing adsorption includes fruit shell-based activated carbon, and the shell-based activated carbon is modified with metal ions, and the adsorption effect of the shell-based activated carbon is better after modification. Experiments show that: CU 2+ and Mg 2+ The modification effect of mixed metal ions exceeds that of CU 2+ and Mg 2+ Use alone. Therefore, the husk-based activated carbon undergoes CU 2+ and Mg 2+ Mixed metal ion modification. Further experiments showed that the CU 2+ and Mg 2+ When the mixing ratio was 9:1, the adsorption effect of the modified shell-based activated carbon was better.

[0043] Preferably, the high-efficiency desulfurizer is an iron oxide-based high-temperature gas desulfurizer. Experiments show that the regeneration environment parameters of the iron oxide-based high-temperature gas desulfurizer are temperature of 580°C and space velocity of 3900h -1, The oxygen...

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Abstract

A PSA decarbonization tail gas desulfurization technology comprises the following steps: S1, carrying out pressure swing adsorption on a synthetic ammonia product; S2, discharging hydrogen sulfide andcarbon dioxide generated by desorption into a high-efficiency fine desulfurization device, and adsorbing the hydrogen sulfide in tail gas by using a high-efficiency desulfurizer; and S3, feeding thedischarged carbon dioxide into a carbon dioxide recovery device, recovering the carbon dioxide, and regenerating the desulfurizer after when the high-efficiency desulfurizer is used for a period of time and the activity is decreased. The desulfurizer is regenerated, and can be continuously supplied, so the hydrogen sulfide in the tail gas can be efficiently and stably adsorbed continuously, thereby high-purity carbon dioxide can be obtained.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment, in particular to a PSA decarburization tail gas desulfurization process. Background technique [0002] PSA (Pressure Swing Adsorption) decarburization is the use of adsorbents that have different adsorption capacity, adsorption speed and adsorption force under different partial pressures, and selectively adsorb the components of the separated gas mixture under a certain pressure. Features, pressure adsorption to remove impurity components in raw gas, decompression desorption to regenerate the adsorbent, the whole operation process is carried out at room temperature. The Chinese patent CN202139057U PSA decarburization device is mainly used in coal head enterprises. The CO2 in the production process of such enterprises is relatively surplus, and the hydrogen and nitrogen can achieve a high recovery rate, but the CO2 recovery rate is only about 70%. The purity of purified gas and desorbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047B01D53/26B01D46/00
CPCB01D46/00B01D53/047B01D53/26B01D2253/102B01D2256/22B01D2257/304
Inventor 汪孔斌
Owner ANHUI HUAERTAI CHEM IND
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