"The discussion of energy consumption for cryogenic & combined #DirectAirCapture systems is explored in the newly published thesis."ποΈ
Details are discussed in aπ§΅β¬οΈ
1/10
In this novel approach, "a thermodynamic model was constructed using psychometric theories to model the #desublimation of CO2 in a #DAC system. The system was modeled
to include a precooling heat exchanger & a deposition chamber where the desublimation
of CO2 occurs."
2/10
3οΈβ£ base systems studied:
πΈ NC (no precompression/turbine recovery)
πΈPC (precompression only)
πΈTR (precompression & turbine recovery)
at 3οΈβ£ different compression ratios, n=400, 800 & 2000.
Then, a combination #DAC system, PSA, was modeled."
3/10
"A dual-column, 4οΈβ£-step Skarstrom Cycle PSA (pressure swing adsorption & cryogenic distillation) unit was analyzed using Extended Langmuir Models & the
ideal gas law to simulate a CO2 conc. prior to the deposition chamber. The NC & PSA systems were assessed at Tamb= -50β¦C."
4/10
This study finds that "while increasing the compression ratio of the system, there is no net energy benefit when capturing CO2 given the current state-of-the-art in commercial compressor & #cryocooler capabilities."
5/10
"The assessment of the efficiency of a precooler versus TR finds that it is more advantageous to utilize a heat exchanger precooler than precompression with turbine recovery in a #DAC system. Combining DAC systems may yield a more efficient system."
6/10
"PSA combined with cryogenic capture is less energy intensive than cryogenic capture alone. In a combined #DAC system with PSA and cryogenic distillation,
the PSA unit has a significantly lower energy consumption than the #cryocooler."
7/10
"Increasing the concentration of CO2 entering the deposition chamber significantly decreases the required energy consumption of the #cryocooler."
8/10
Read the complete #Doctoral#Thesis entitled: "Atmospheric Carbon Capture: A Review on Current Technologies and Analysis of Energy Consumption for Various Direct Air Capture (DAC) Systems" here β¬οΈ commons.erau.edu/edt/728/
π¨A new 3-year study found that by combining crushed rock + compost + biochar could remove 51.7 million tons of COβe/yearβjust by treating 8% of Californiaβs rangelands.
#ERW #CDR #biochar
Hereβs the details:π§΅1/9
2/ Researchers spread finely crushed metabasaltic rocks across test plots in Browns Valley, California, in each of 3yrs.
Along with the crushed rock, some of the applications included compost or a combination of compost & biochar (burned pine & fir left over from local logging).
3/ Other plots were treated with only compost, and a group of control plots received no treatment.
Throughout the year, the team monitored each plot for levels of soil organic and inorganic carbon, pore water dissolved carbon, aboveground biomass, and greenhouse gas emissions.
π° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (14 April - 20 April 2025):
π:
π§΅0/18
Microsoft has entered into the worldβs largest carbon removal agreement, securing a 15-year contract to purchase 6.75 million metric tons of permanent CDR from AtmosClear, a subsidiary of Fidelis, utilizing BECCS technology.
Occidental Petroleum has acquired carbon removal startup @holoceneclimate, marking its second direct air capture acquisition in two years. The deal was made through its low-carbon arm, Oxy Low Carbon Ventures, for an undisclosed amount.
π¨πWe launched the first-of-its-kind Solar Geoengineering Events Calender last year, to create the go-to public resource for anyone tracking key events in #SRM. From conferences to job deadlines, we update it regularly.
π° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (07 April - 13 April 2025):
π:
π§΅0/21
CO280 signed a landmark 3.69 million tonne agreement with Microsoft over 12 years to scale-up carbon dioxide removal in the us pulp and paper industry.
Occidental and its subsidiary 1PointFive have secured the first-ever Class VI permits issued by the U.S. Environmental Protection Agency for sequestering CO2 from direct air capture operations.
π¨A new study from China introduced a groundbreaking system that couples liquid-based direct air capture (L-DAC) with diabatic compressed air energy storage (D-CAES). This integration captures COβ & stores energy at competitive costsβ$0.53/kWh & $259/tCOβ. #DAC
DETAILSπ§΅1/8
2/ Led by researchers at East China University of Science & Technology and Tongji University, the system innovatively combines solvent-based COβ capture for both atmospheric and point-source emissions with energy storage.
3/ In the L-DAC component, ambient air is brought into contact with a sprayed alkaline solution.
This reaction converts COβ into a carbonate solution that precipitates as solid carbonatesβcapturing roughly 1 Mt of COβ and delivering 1.48 Mt dry COβ annually.