US 12,478,915 B2
System and method for synchronously recovering nitrogen and carbon dioxide from boiler flue gas
Shaoyun Chen, Beijing (CN); Yuxue Li, Beijing (CN); Li Qi, Beijing (CN); and Yongchun Zhang, Beijing (CN)
Assigned to DALIAN UNIVERSITY OF TECHNOLOGY, Dalian (CN); and BEIJING CARBON CYCLE TECHNOLOGY, Beijing (CN)
Filed by DALIAN UNIVERSITY OF TECHNOLOGY, Dalian (CN); and BEIJING CARBON CYCLE TECHNOLOGY, Beijing (CN)
Filed on Aug. 9, 2023, as Appl. No. 18/447,072.
Application 18/447,072 is a continuation of application No. PCT/CN2022/124845, filed on Oct. 12, 2022.
Claims priority of application No. 202111216165.9 (CN), filed on Oct. 19, 2021.
Prior Publication US 2023/0381712 A1, Nov. 30, 2023
Int. Cl. F25J 3/02 (2006.01); B01D 53/04 (2006.01); B01D 53/053 (2006.01); B01D 53/26 (2006.01); C01B 21/04 (2006.01); F23J 15/00 (2006.01)
CPC B01D 53/053 (2013.01) [B01D 53/0423 (2013.01); B01D 53/0446 (2013.01); B01D 53/265 (2013.01); B01D 2256/10 (2013.01); B01D 2256/22 (2013.01); B01D 2257/302 (2013.01); B01D 2258/0283 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A system for synchronously recovering nitrogen and carbon dioxide from boiler flue gas, characterized in that, the system comprises:
a flue gas pretreatment system used for dehydrating and cooling a boiler flue gas;
a carbon and nitrogen separation system communicated with the flue gas pretreatment system, and used for performing pressure swing adsorption on a pretreated flue gas and separating a nitrogen-containing vent gas and a crude carbon dioxide gas, an adsorption pressure of the carbon and nitrogen separation system being 0.20-0.40 MPa;
a carbon dioxide secondary purification system communicated with the carbon and nitrogen separation system, and used for performing secondary purification on the crude carbon dioxide gas separated from the carbon and nitrogen separation system; and
a nitrogen concentration and purification system communicated with the carbon and nitrogen separation system and the carbon dioxide secondary purification system, and used for purifying the nitrogen-containing vent gas separated from the carbon and nitrogen separation system and a vent gas generated by the carbon dioxide secondary purification system.