Technology
to
Capture
Mercury
from
Flue
Gas
W.
L.
Gore
&
Associates
Tests
January
16,
2004
Wojciech
Jozewicz
ARCADIS
4915
Prospectus
Drive
Durham,
North
Carolina
27713
2
Motivation
for
Testing

Development
of
Multipollutant
Technology

Opportunity
to
avoid
fly
ash
contamination
with
carbon
3
Scope
of
Testing

Bench
scale
screening

Small
pilot
plant
verification
(~
30
kWe)
4
Parties
Involved

W.
L.
Gore
&
Associates
­
Inventors
and
developers
of
the
technology

ARCADIS
­
Testing
of
technology;

sampling

US
EPA
­
Made
facilities
available
for
testing

Funding
provided
by
W.
L.
Gore
&

Associates;
direct
agreement
with
ARCADIS
5
Potential
Advantages
of
the
Concept

No
contamination
of
fly
ash

No
additional
dust
loading
or
pressure
drop
HG
emissions
<
regulations
Raw
Gas
Activated
Carbon
Contaminated
Carbon
Waste
Raw
Gas
Hg
emissions
<
regulations
Less
Waste
to
Landfill
6
Test
Matrix

Bench
scale
screening
of
various
insert
formulations
(
over
100
tested)

 
Mercury
capacity

Pilot
scale
verification
 
Durability
of
inserts
 
Resistance
to
accelerated
aging
 
PRB
and
lignite
coals
7
Bench
Scale
Apparatus
8
Bench
Scale
Screening
Results
75­
90
Fully
promoted
felt
26­
30
Partially
promoted
felt
0.27
Unpromoted
felt
substrate
0.003
ePTFE
membrane/
felt
laminate
CAPACIT
Y
mgHg/
g
SUBSTRATE
9
Bench
Scale
Reactivity

1
ppm
of
Hg;
severely
accelerated
test;
only
N2,
O2,
and
H2O
in
carrier
gas;
no
SO2

Binding
capacity
in
excess
of
75
mg
Hg/
g
Not
Promoted
10
Pilot
Plant
Schematic
Scrubber
Baghouse
Stack
PSA
PSA
Roof
Coal
11
Pilot
Plant
Detail
12
PRB
Coal
Tests

Continuous
PSA
data
averaged
over
90
percent
Hg
removal
1
2
3
4
5
6
Weeks
On­
Stream
13
ND
Lignite
Tests
1
2
3
4
5
6
7
Days
On­
Stream

Continuous
PSA
data
ranged
between
70
and
96
percent
Hg
removal
14
Control
Tests

PRB
coal;
Up
to
13
percent
Hg
removal
15
Durability
of
Inserts

No
performance
deterioration
until
Hg
pulse

Total
Hg
accumulation
of
approximately
300,000
µ
g
over
6
filters
Time,
hours
16
Concept

Compatible
with
existing
baghouses

No
change
in
system
infrastructure
or
footprint
