Capturing CO2 from ambient air - David Keith

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CO 2 concentration [ppm] 400 390 380 370 360 350 340 background avg = 380.7 spray starts switch to outlet switch to background avg = 343.2 avg = 376.8 1000 1500 2000 2500 time [s] Figure B.8: Measured CO2 concentration during a portion of Trial 2. Horizontal lines indicate the average value over the time span of the line. The difference between background and steady state outlet concentration represents the rate of CO2 absorption into solution. “Switch to...” refers to changing the point of measurement, which begins in the outlet position. 82
Absorbed CO 2 [mol/l] 0.3 0.25 0.2 0.15 0.1 0.05 Carbonate in solution, TOC measured Cumulative CO 2 absorbed, calculated from LiCOR measurements 0 0 10 20 30 40 50 60 70 running time [min] Figure B.9: CO2 absorbed during Trial 2: comparison of two measurement methods. The solution starts with a nonzero carbonate concentration because of absorption during the previous trial. The Y-intercept of the LiCOR calculation is adjusted to match the first TOC sample in order to account for this initial carbon content. Error bars indicate subjective standard error of measurement. 83
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Capturing CO2 from ambient air: a f
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For my family, friends, and everyon
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etween the National Science Foundat
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Contents Acknowledgments iv Abstrac
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List of Figures 1.1 Global CO2 emis
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Chapter 1 Introduction The climate
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egeneration at a high enough concen
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1.4 Routes to air capture 1.4.1 Org
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The NaOH approach is the primary su
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there is no compelling reason to ca
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7Na2CO3(l)+5Na2Ti3O7(s) ⇋ 4Na8Ti5
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changing the process design to acco
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Component / source GJ/t-CO2 electri
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Chapter 3 Contactor In this chapter
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the CO2 capture rate in a spray sys
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CO 2 absorption per pass [mol/l] 10
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CO 2 absorption [mmol/pass] 16 14 1
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Figure 3.5: Water loss measured in
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3.3.1 CO2 depletion in air With lon
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where vt,1 and vt,2 are the termina
Page 41 and 42: surface area [m 2 -surface / m 3 -r
Page 43 and 44: spray mass density [kg / ln(μm)] 1
Page 45 and 46: average surface area [m 2 -spray /
Page 47 and 48: As a bound on the effects of coales
Page 49 and 50: Draft type Height [m] Crosssectiona
Page 51 and 52: 2. Median assumptions, no coalescen
Page 53 and 54: capture system. We can also see tha
Page 55 and 56: Multistage spray One possible solut
Page 57 and 58: Although, the cost of water loss ma
Page 59 and 60: 3.5.6 Solids formation - scaling an
Page 61 and 62: Chapter 4 Cost of air capture Altho
Page 63 and 64: Capital Capacity Electric a Thermal
Page 65 and 66: Component Capital + O&M Energy cost
Page 67 and 68: Chapter 5 Discussion Overview In th
Page 69 and 70: 5.2 Lessons for assessing of future
Page 71 and 72: Bibliography Adams, P. J. and Seinf
Page 73 and 74: IPCC (2001). Climate Change 2001: M
Page 75 and 76: Tzivion, S., Feingold, G., and Levi
Page 77 and 78: F Liquid flow rate in the contactor
Page 79 and 80: Appendix B Experimental details and
Page 81 and 82: Figure B.2: Photograph of completed
Page 83 and 84: Figure B.4: Two cranes lift the rea
Page 85 and 86: fastened together and lined, the re
Page 87 and 88: The prototype has three particle fi
Page 89 and 90: Figure B.7: Sampling points of CO2
Page 91: In order to calculate CO2 absorbed,
Page 95: periodic switching of the spray on
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Capturing CO2 from ambient air - David Keith

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