of 18
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
1/18
Air Separation Unitfor Oxy-Coal Combustion
ys ems
-
Richard Dubettier
Nicolas Perrin
Air Li uide
1st International Oxyfuel Combustion Conference, Cottbus
September 9, 2009
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
2/18
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
3/18
ASU optimized for oxycombustion
From todays most efficient ASUs
than 100 years but is stil l improving& the worlds largest ASUs
ISAB IGCC (2x 1800 tpd O2)O eration since 1999
Sasol Train 15 (4200 tpd O2 MSL)O erat ion since 2003 co order in 2007
to a new specific design foroxycombustion
...with additional power reductionthrough cycle integration
31st International Oxyfuel Combustion Conference, Cottbus 09/09/09 .3
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
4/18
130
ASU optimized for oxycombustion
110
120
enditure
90
100
capitale
x
70
80
No
rmalize
60
120 140 160 180 200 220 240 260 280
Specifi c energy of separation (kWh/t)
20% improvement has already been achieved todayin specific energy consumption
41st International Oxyfuel Combustion Conference, Cottbus 09/09/09
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
5/18
Integration : process simulation
FG Cleaning & Recycle
Performance
Boiler
eam
Turbine
Cycle
Pulverizer
51st International Oxyfuel Combustion Conference, Cottbus 09/09/09
ASU
.5
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
6/18
Net Plant Efficiency Comparison
CO2 capture from pulverized coal plants is possible with
50.0
without CCS with CCS
Babcock & Wilcox /
Air Liquide 2008
results
penalty ofonly ~6 percentage pts
39.4
33.632.1
39.4
35.0
40.0
45.0
%(
HHV
)
. .
20.0
25.0
30.0
Efficiency
5.0
10.0
15.0
NetPlant
0.0SC PC
Air-Fired
SC PC
Air-Fi redIGCC Avg SC PC
Oxy-Fired
B&W / AL
SC PC
Oxy-Fired
IGCC Avg
Amines
TECHNOLOGY
61st International Oxyfuel Combustion Conference, Cottbus 09/09/09 .6
SP PC = Super Critical Pulverized Coal IGCC = Integrated Gasification Combined Cycle
Data from DOE/NETL reports and B&W Air Liquide studies (2007 2008)
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
7/18
Cycle analysis
, .can be achieved today with the following results :
MW Ese ASU
(kWh/t)Gross power from steam 724.1
ross power or .
Gross power for CO2 CPU 62.4
,miscellaneous
.
Sub-total Auxiliary load 174.1
Net plant power 550.0
71st International Oxyfuel Combustion Conference, Cottbus 09/09/09
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
8/18
Gross/Net power consumption of ASU
Adiabatic compression
Oxygen preheating to approx. 150 C
Gain : 5.6 MWNet power of ASU: 70.2 MW (i.e. Esep = 145 kWh/t)
Another benefit of oxycombustion is to decreasethe flue as flow and therefore the heat lossesassociated with the flue gas condenser ; this gainhas been evaluated at 8.1 MW for a 550 MWe net
lant
Therefore the net penalty associated with the
81st International Oxyfuel Combustion Conference, Cottbus 09/09/09
.
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
9/18
Further ASU improvements
Specific energy reduction
Capital expenditure reduction
Advanced cryogenic ASU concept
91st International Oxyfuel Combustion Conference, Cottbus 09/09/09
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
10/18
Specific energy reduction
Additional power savings with new processcycles
ur er re uc on w e eve opmen o new
technologies
A further gain of 10 % is targeted for 2015
200 kWh/t Specific
160 kWh/t145 kWh/t
without heat
integration
101st International Oxyfuel Combustion Conference, Cottbus 09/09/09
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
11/18
MW MW Delta
Specif ic energy reduction
2008study
2015target
Gross power from steam 724.1 729.8 +0.8%
Gross power for ASU 75.8 68.2 -10%
Gross power for CO2 CPU 62.4 56.2 -10%
Primary, FD & ID fans &miscellaneous
35.9 37.3 +3.9%
Sub-total Auxiliary load 174.1 161.7 -8%
Net plant power 550.0 568.1 +3.3%
HHV efficiency 33.6% 34.7% +1.1pt
Net power of ASU with heat integration is targeted at 130kWh/t
CO2 capture from pulverized coal plants is expected to
111st International Oxyfuel Combustion Conference, Cottbus 09/09/09
achieve only 4.7 percentage pts penalty
With USC cycle (700C), the HHV efficiency could beabove 40%
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
12/18
Capital expenditure reduction
been launched on the ASU for oxycombustionwith a target of -20%
121st International Oxyfuel Combustion Conference, Cottbus 09/09/09
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
13/18
Advanced ASU concept
high pressure instead of atmospheric pressure
350CAir
11 bar abs
Adiabatic compression
Hot nitrogenASU
330C5 bar abs
Hot oxygen
131st International Oxyfuel Combustion Conference, Cottbus 09/09/09
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
14/18
Advanced ASU concept
a dual Rankine (steam) / Brayton (N2) cycle
Boiler Steam turbine
Nitrogen
Nitrogen out 620C or higher
aNitrogen turbine
BFW+
141st International Oxyfuel Combustion Conference, Cottbus 09/09/09
Oxygen
at 330C Air compressor
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
15/18
Advanced ASU concept
Lower s ecific ener of se aration : a rox. -15 % i.e.110 kWh/t
Lower CAPEX for the Air Separation Unit : higher
size (up to 7500 t/d)Compressor and turbine offer has to be developed
g pressure cyc e a rea y emonstrate or application
Puertollano S ain Yokohama Ja an
Most efficient
ASU in the world
151st International Oxyfuel Combustion Conference, Cottbus 09/09/09
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
16/18
Conclusions
Oxycombustion is today the most efficient route forCCS
Further improvements in the Air Separation Unit arearge e o n erm o ower consump on an
Capital expenditure reduction
Advanced cryogenic Air Separation Unit concept is apotential breakthrough for the oxycombustion route
161st International Oxyfuel Combustion Conference, Cottbus 09/09/09
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
17/18
Acknowledgement
a coc cox or
heat integration studies
Contacts
- . .
7/27/2019 1st IEA GHG Oxyfuel Conf ASU 090909_final
18/18
Specif ic energy of separation : definition
Power required to produce 1 metric ton of pure oxygen contained in agaseous oxygen stream at a given oxygen purity at atmosphericpressure (101325 Pa) under ISO conditions (15C, RH 60%)
, ,
Heat of regeneration of driers (steam, natural gas or electrical) notincluded
Power consumption of cooling system (CW pumps, fans,) not
included
Specific energy of production = Specific energy of separation +specific energy of compression
Specific energy of compression 0.1xQ(Nm3/h)xlog10(PGOX/PATM)1 t/h of GOX 1000 / 1.427637 700 Nm3/h
For 1.4 bar abs : 10 kWh/t of pure O2
181st International Oxyfuel Combustion Conference, Cottbus 09/09/09
