POWER July 2014 - 10

THE BIG PICTURE: Recycling CO2
06
ENHANCED GEOTHERMAL
SYSTEMS (EGS)
What: A new approach to this geothermal
technology involves circulating supercritical
CO2
as a heat exchange fluid instead of
water or brine to recover geothermal heat
from reservoirs 3 km deep or more for power
generation. The concept could significantly
increase the cycle efficiency compared to
nificantly
pared to
current EGS.
Status: Under development
n
02
UREA YIELD BOOSTING
What: During production of urea (which
is used to make fertilizers), a surplus of
ammonia is often produced when natural
gas is the feedstock. CO2
can be
compressed and combined with the
surplus ammonia for additional urea
production.
Status: Commercial. CO2
capture plants
for urea yield boosting have been
installed since the late 1990s.
W
a
01
ENHANCED OIL RECOVERY (EOR)
What: Involves injection of CO2
into a
depleted oil bearing field to decrease oil
viscosity, allowing it to flow to a
production well more easily, and
increasing production by 5% to 40%.
Status: Commercial. At least 113
CO2
-EOR projects inject 3.1 billion cubic
feet per day of natural and industrial
CO2
for EOR across the U.S.
W
at
CLATHRATE DESALINATION
What: CO2
, mixed with brine from an aquifer
surrounded by water
at high pressure and low temperature, forms
a hydrate of CO2
molecules. The hydrate is removed and
rinsed, and then goes through multiple
stages to remove dissolved solids in the
brine, resulting in an exhaust stream
of potable water that can be sold where
water is in short supply.
Status: Under development
The ongoing focus on carbon capture, utilization, and storage (CCUS)
has resulted in novel ways carbon dioxide (CO2
03
METHANOL PRODUCTION
What: CO2
N
What: C
hydr
reacted
Statu
can be combined with
hydrogen, compressed, and
reacted to produce methanol an d
water.
Status: Demonstration stage
(plant in Iceland)
h
ALGAE CULTIVATION
What: CO2
can be bubbled through
algae cultivation systems, increasing
yield for a range of uses, including
biomass, biofuels, chemicals, and
food products.
Status: Demonstration level of
technical maturity
cal matur
04
or power
05
07
CONCRETE CURING
What: At a precast concrete
production facility, on-site waste
CO2
from flue gas can be reacted
with calcium to form limestone
within the concrete, and possibly
increase concrete strength and
durability.
ease con
Status: Under development
SStatus: Un
) captured from industrial
processes and power generation can be used profitably-thereby
offsetting costs associated with carbon capture. Here are seven
potential options that are undergoing development or are in commercial
use today. Source: Department of Energy, Office of Fossil Energy
-Copy and artwork by Sonal Patel, associate editor
10
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POWER | July 2014
http://www.powermag.com

POWER July 2014

Table of Contents for the Digital Edition of POWER July 2014

Contents
POWER July 2014 - Cover1
POWER July 2014 - Cover2
POWER July 2014 - Contents
POWER July 2014 - 2
POWER July 2014 - 3
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POWER July 2014 - Cover3
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