Apparatus of purifying CO2 in natural gas through low-temperature pressure swing adsorption (PSA) technology and method thereof
A pressure swing adsorption, CO2 technology, applied in chemical instruments and methods, separation methods, gas fuels, etc., to achieve the effects of high purification, cost reduction, and large adsorption capacity
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[0040] Example 1
[0041] The pre-treated natural gas with a pressure of 1.6MPa is pre-cooled to 0℃ in one stage, and then passed into the low temperature pressure swing adsorption purification natural gas system that has been cooled to -10℃. The adsorber has been pre-loaded with coconut shell activated carbon and activated carbon particles. Diameter 1~3mm, specific surface area greater than 500m 2 / g. At this time, the low-temperature PSA purification natural gas system is in a low-temperature and high-pressure state, and the solid adsorbent affects CO in the natural gas. 2 Adsorption without or little CH 4 . The low-temperature natural gas continuously passes through the system, and the solid adsorbent continuously treats the CO in the natural gas 2 Adsorption, so as to achieve the purpose of purifying natural gas. Dynamic penetration curve such as image 3 Shown. CH 4 The penetration time is 1840s, CO 2 Penetration time is 6120s, CO 2 / CH 4 The separation factor is 3.825, CH...
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[0042] Example 2
[0043] The pre-treated natural gas with a pressure of 3.8MPa is pre-cooled to -10℃ in one stage, and then passed into the low-temperature pressure swing adsorption purification natural gas system that has been cooled to -20℃. The adsorber has been pre-loaded with 13X molecular sieve and molecular sieve particles. 1.5~3mm diameter, specific surface area greater than 650m 2 / g. At this time, the low-temperature PSA purification natural gas system is in a low-temperature and high-pressure state, and the solid adsorbent affects CO in the natural gas. 2 Adsorption without or little CH 4 . The low-temperature natural gas continuously passes through the system, and the solid adsorbent continuously treats the CO in the natural gas 2 Adsorption, so as to achieve the purpose of purifying natural gas. Dynamic penetration curve such as Figure 5 Shown. CH 4 The penetration time is 2240s, CO 2 Penetration time is 7210s, CO 2 / CH 4 The separation factor is 4.672, CH 4 The ...
Example Embodiment
[0044] Example 3
[0045] The pre-treated natural gas with a pressure of 6.5 MPa is pre-cooled to -10°C in one stage, and then passed into the low-temperature pressure swing adsorption purification natural gas system that has been cooled to -30°C. The adsorber has been pre-loaded with mesoporous material MCM- 41. The particle size of the mesoporous material is 2~4mm, and the specific surface area is greater than 800m 2 / g. At this time, the low-temperature PSA purification natural gas system is in a low-temperature and high-pressure state, and the solid adsorbent affects CO in the natural gas. 2 Adsorption without or little CH 4 . The low-temperature natural gas continuously passes through the system, and the solid adsorbent continuously treats the CO in the natural gas 2 Adsorption, so as to achieve the purpose of purifying natural gas. Dynamic penetration curve such as Figure 7 Shown. CH 4 The penetration time is 3140s, CO 2 Penetration time is 9180s, CO 2 / CH 4 The separat...
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