Why standard solution of NaOH is left in air loses its strenth
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co2In contrast to conventional carbon capture systems for
power plants and other large point sources, the system described
in this paper captures CO2 directly from ambient air. This has
the advantages that emissions from diffuse sources and past
emissions may be captured. The objective of this research is
to determine the feasibility of a NaOH spray-based contactor for
use in an air capture system by estimating the cost and
energy requirements per unit CO2 captured. A prototype system
is constructed and tested to measure CO2 absorption, energy
use, and evaporative water loss and compared with theoretical
predictions. A numerical model of drop collision and
coalescence is used to estimate operating parameters for a fullscale
system, and the cost of operating the system per unit
CO2 captured is estimated.Theanalysis indicates thatCO2 capture
from air for climate change mitigation is technically feasible
using off-the-shelf technology. Drop coalescence significantly
decreases the CO2 absorption efficiency; however, fan and
pump energy requirements are manageable. Water loss
is significant (20 mol H2O/mol CO2 at 15 °C and 65% RH) but
can be lowered by appropriately designing and operating the
system. The cost of CO2 capture using NaOH spray (excluding
solution recovery and CO2 sequestration, which may be
comparable) in the full-scale system is 96 $/ton-CO2 in the
base case, and ranges from 53 to 127 $/ton-CO2 under alternate
operating parameters and assumptions regarding capital
costs and mass transfer rate. The low end of the cost range
is reached by a spray with 50 μm mean drop diameter, which
is achievable with commercially available spray nozzles.
power plants and other large point sources, the system described
in this paper captures CO2 directly from ambient air. This has
the advantages that emissions from diffuse sources and past
emissions may be captured. The objective of this research is
to determine the feasibility of a NaOH spray-based contactor for
use in an air capture system by estimating the cost and
energy requirements per unit CO2 captured. A prototype system
is constructed and tested to measure CO2 absorption, energy
use, and evaporative water loss and compared with theoretical
predictions. A numerical model of drop collision and
coalescence is used to estimate operating parameters for a fullscale
system, and the cost of operating the system per unit
CO2 captured is estimated.Theanalysis indicates thatCO2 capture
from air for climate change mitigation is technically feasible
using off-the-shelf technology. Drop coalescence significantly
decreases the CO2 absorption efficiency; however, fan and
pump energy requirements are manageable. Water loss
is significant (20 mol H2O/mol CO2 at 15 °C and 65% RH) but
can be lowered by appropriately designing and operating the
system. The cost of CO2 capture using NaOH spray (excluding
solution recovery and CO2 sequestration, which may be
comparable) in the full-scale system is 96 $/ton-CO2 in the
base case, and ranges from 53 to 127 $/ton-CO2 under alternate
operating parameters and assumptions regarding capital
costs and mass transfer rate. The low end of the cost range
is reached by a spray with 50 μm mean drop diameter, which
is achievable with commercially available spray nozzles.
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Yes,actually...The objective of this research isto determine the feasibility of a NaOH spray-based contactor foruse in an air capture system by estimating the cost and
energy requirements per unit CO2 captured. A prototype system
is constructed and tested to measure CO2 absorption, energy
use, and evaporative water loss and compared with theoretical
predictions. That's why....
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