Research On Water Consumption Of CCUS Technology And Analysis Of Its Application Potential

The application of CCUS technology can effectively control the global temperature rise,but carbon dioxide capture needs to consume a lot of energy and resources,causing a certain pressure on local capital and water resources.Based on the modeling of different post combustion carbon capture technology and direct air capture technology,the test of new absorbent of amine capture technology and the test of industrial demonstration device of variable humidity regeneration technology,the cost and water consumption related parameters of different CCUS technologies are obtained and analyzed,and the comprehensive index evaluation model is introduced to analyze the water resources carrying capacity.Based on IECM,the modeling and analysis of amine capture,membrane separation,PSA and TSA were carried out.The results show that the water consumption of membrane separation technology and PSA technology is low,and the emission reduction cost of amine capture technology and membrane separation technology is low.By testing the new absorbent and optimizing the cooling process,and further substituting it into the IECM model,the results show that the emission reduction cost of the new MDEA/PZ absorbent is 24%lower than that of MEA,and the increment of water consumption is 36%lower than that of MEA.Based on the climate conditions,local water supply and utilization of Urumqi,Yulin,Tianjin,Shanghai and Fuzhou with different water resources abundance,the analysis shows that Yulin area is more sensitive to the application of carbon capture technology,and the intensive use of water in higher areas will increase the sensitivity of the application of carbon capture technology.For other cities except Yulin,the effects of membrane separation technology or amine capture technology on the sustainability of local water resources have no significant difference.Through the modeling of two direct air carbon dioxide capture technologies,namely high-temperature lye technology and solid amine adsorption technology,and the test and analysis of the industrial demonstration device of variable humidity regeneration technology,it is concluded that the integrated cost of carbon capture is about 32.4-161.5$/t CO₂ and the water consumption is about 1.7-109.3 t H₂O/t CO₂.The energy consumption of the capture process will be significantly increased by depressurization of the absorption（adsorption）process with high water consumption.