Heating Value and Wobbe Index Measurement in Natural Gas for

APPLICATION DATA SHEET
POWER
POWER
If this customer did not
replace the old
technology
with a compatibleIndex Measurement in
Heating
Value
and
Wobbe
continuous level measurement, they risked high operations and
maintenance costs associated with obsolete displacer parts. Without a
Natural
Gas for Fast Turbine Control
reliable level measurement, the plant risked process instability, potential
equipment damage, and potential outages.
SOLUTION
Application
As a solution
to strong
this problem,
E.ON
a Rosemount
5301 GWR with
Natural
gas shows
variations
in itsinstalled
composition.
For instance,
rigid
single
leadmethane
probe. The
5300 was
installed in a chamber
the
ratio
between
(CHRosemount
) and non-methane
hydrocarbons
4
and tested
against
a newon
electronic
testing,
(C2+)
is strongly
depending
the sourcedisplacer.
of the fuelDuring
gas. With
the the GWR
outperformed
the
displacer
as it was
unaffected
temperature
changes
liberalization
of the
gas
market, higher
variations
occur,by
especially
in
and
had
a
faster
response
time
to
the
rapid
level
changes.
Furthermore,
the
regard to the non-combustibles like carbon dioxide (CO2) or nitrogen
strong
signal
enabled
by
direct
switch
technology
allowed
the
Rosemount
(N2). While natural gas from Russia or Europe typically contains
5300
measure
in turbulent
CO
onlytoinaccurately
the range of
a few percent,
natural conditions.
gas from Asia Pacific
2
shows
concentrations
up
to
20%.
These
large
variations
are 5301 and
E. ONCO
was
pleased
with
the
performance
of
the
Rosemount
2
challenging
usingthe
natural
gas from
differentwith
sources
in gas Rosemount 5301
eventuallywhen
replaced
electronic
displacer
another
turbines.
Variation
in the natural
composition
affectsin
the
Transmitter.
Business
results gas
included
a reduction
maintenance costs for
calorific
valueand
of the
gas which
lead todoes
increased
pollutant
both labor
parts.
Sincemay
the GWR
not need
calibration and
(N2). As second option for low BTU applications, a photometric
emission
(e.g.
NOx), loss
of combustionthey
efficiency
and eventually
provides
a reliable
measurement,
were able
to maintain process
bench at 6.6 µm with similar response factors for C2H6, C3H8 and
turbine
damage.
stability
thereby minimizing the risk of reduced power generation,
A second Rosemount
5301
other higher hydrocarbons
can be used.
Thisreplaces
channelthe
haselectronic
no
outages, and equipment damage.
In some instances a fast real time gas analysis of heating value and
Wobbe
index has become necessary to provide early warning of
RESOURCES
changes in the composition.
displacer.
limitation on the
N2 content, but it has stronger limitations on the
C3+ content. Both options do not allow selective measurements of
ethane, propane, etc.
Emerson Automation Solutions Power Industry
For Wobbe index measurement an additional CO2 optical bench
Emerson.com/en-us/industries/automation/power-generation
Whilst
gas chromatographs provide very accurate measurements of
with the measurement range of 0 to 5% or 0 to 20% is integrated
all fuel gas components and physical properties (CV Bias Error +/- 0.1
into the analyzer. Nitrogen or another selected component can be
3
MJ/m
), the response
is typically
than
90 s for a C6+, N2
Rosemount
5300 time
Series
Guidedmore
Wave
Radar
determined by balance. The response time of the analyzer is 10 s.
and
CO2 analysis. Emerson therefore offers the X-STREAM process
Emerson.com/catalog/en-us/rosemount-5300-gwr-transmitter
gas analyzer where speed is required in turbine control applications.
Solution
Calculation of Heating Value and
Wobbe Index
From the measurement of CH4 and C2+, the upper and lower heating
Non-disperse infrared (NDIR) photometry allows the detection of
value is calculated
according to ISO EN6976-2005. An additional CO2
Standard
Terms
and
Conditions
of
Sale
can
be
found
on
the
Terms
and
Conditions
of
Sale
page.
Linkedin.com/company/Emerson-Automation-Solutions
most fuel gas components within seconds. Heating values can be
The Emerson logo is a trademark and service mark of Emerson Electric Co.
Twitter.com/Rosemount_News
measurement
allows
the determination of mean molar mass and
provided
byand
direct
measurements
of CH4 and
C2+.
Rosemount
Rosemount
logotype are trademarks
of Emerson.
All other marks are the property of their respective owners.
specific density Facebook.com/Rosemount
of the sample probe. Wobbe index is calculated from
Youtube.com/user/RosemountMeasurement
© 2017 Emerson. All rights reserved.
For CH4 detection, a special 0-100 % CH4 NDIR bench measuring
heating value and
specific density, according ISO EN 6976-2005.
Google.com/+RosemountMeasurement
at 7.85 μm is used which shows low cross interferences from
Field
ethane
H ), propane (C3H8) and carbon
dioxide
(COOffice
). For the
Global(C
Headquarters
Europe
Regional
Asia Limitations
Pacific Regional Office
Middle
Eastof
andApplications
Africa Regional Office and
2 6
2
Emerson
Automation
Solutions
EmersonOne
Automation
Solutions
Emerson
Automation
Emerson
Automation
Solutions
C2+
measurement,
two
options are available.
option for
high
Both configurations are only suitable for analysis
of naturalSolutions
gas or
Europe GmbH
Asia Pacific Pte Ltd
6021
Innovation
Blvd.
Emerson
FZE
P.O.
Box
17033,
BTU applications is a photometric bench at 3.4 µm, which shows
natural gas like mixtures. The presence of interfering components
19a P.O. Box 1046
1 Pandan Crescent
Shakopee,factors
MN 55379,
Jebel
Free Zone
- South 2
response
ofUSA
1, 1.6, 1.9 and 2.0Neuhofstrasse
to C2H6, propane,
i-butane
likeAlihigher
hydrocarbons
starting from
C3H8 (C3+), Helium (He),
CH 6340 Baar, Switzerland
Singapore 128461
+1
800
999
9307
or
+1
952
906
8888
Dubai,
United
Arab
Emirates
(i-C4H10) and n-butane (n-C4H10). These NDIR response factors
Hydrogen (H2) or Hydrogen Sulfide (H2S) will reduce the accuracy.
+41 (0) 41 768 6111
+65 6777 8211
+1 952 949 7001
+971 4 8118100
closely
correspond to the heating values and allow determination of
Field of applications for both configurations are given in Tables 1 and
+41 (0) 41 768 6300
+65 6777 0947
[email protected]
+971 4 8865465
heating value and Wobbe index. The bench shows low interference
2 for an accuracy of 2%.
[email protected]
[email protected]
[email protected]
to water, CO2 and CH4, but is restricted to low amounts of nitrogen
00830-1500-4530, Rev AA
POWER
POWER
POWER
POWER
Table 1: Possible concentration ranges for heating value
Table 2: Possible concentration ranges for Wobbe index
measurements
measurements
thiscustomer
customerdid
didnot
notreplace
replacethe
theold
oldtechnology
technologywith
withaacompatible
compatible
IfIfthis
Ifcontinuous
this customer
did
not replace the
oldrisked
technology
with a compatible
level
measurement,
they
highoperations
operations
and
continuous level
measurement,
they
risked high
and
High
BTU-version they risked
Low BTU-version
continuous
level
measurement,
high
operations
and
maintenancecosts
costs
associated
with)obsolete
displacer
parts. Without a
maintenance
associated
displacer
(typically
above 40 with
MJ/m3obsolete
(typically
below 40parts.
MJ/m3)Without a
maintenance
costs
associated
with
obsolete
displacer
parts.
Without
a
reliablelevel
levelmeasurement,
measurement,
the
plant
riskedprocess
processinstability,
instability,
potential
reliable
the
plant
risked
potential
reliable
level
measurement,
the
plant
risked
process
instability,
potential
CH4, % damage,
70potential
-potential
98
CH4, %
equipment
damage,and
and
outages. 70 - 98
equipment
outages.
equipment
damage, and
potential outages.
CO
0 - 10
0 - 10
CO
2
SOLUTION
SOLUTION
C2H6, %
SOLUTION
High BTU-version
Low BTU-version
(typically above 40 MJ/m3)
(typically below 40 MJ/m3)
70 - 98
70 - 98
0 - 10
0 - 10
0 - 12
0 - 12
2
0 - 12
0 - 12
C2H6, %
AsaaH
solution
tothis
thisproblem,
problem,
E.ONinstalled
installedaaRosemount
Rosemount
5301GWR
GWRwith
with%
As
solution
to
5301
,%
< 4.0 E.ON
< 1.0
C3+,
<3
<2
2
As
a
solution
to
this
problem,
E.ON
installed
a
Rosemount
5301
GWR
with
rigid
single
lead
probe.
The
Rosemount
5300
was
installed
in
a
chamber
rigid
single
lead
probe.
The
Rosemount
5300
was
installed
in
a
chamber
C3+, %
< 3.5
< 2.0
H2, %
<1
< 0.5
rigid
single
lead
probe.
The
Rosemount
5300 was
installed
in athe
chamber
andtested
testedagainst
against
new
electronic
displacer.
During
testing,
the
GWR
and
aanew
electronic
displacer.
During
testing,
GWR
H
S,
ppm
<
500
<
500
He,
%
<
1
< 0.5
and
tested
against
adisplacer
new electronic
displacer.
During
testing, thechanges
GWR
2
outperformed
thedisplacer
was
unaffected
bytemperature
temperature
changes
outperformed
the
asasititwas
unaffected
by
Nthe
,%
<1
no limitation
outperformed
the
displacer
as it
was
by
temperature
changes
2
andhad
hadaafaster
faster
response
time
to
theunaffected
rapidlevel
levelchanges.
changes.
Furthermore,
and
response
time
to
the
rapid
Furthermore,
the
and
hadsignal
a faster
response
time
the rapid
level changes.
Furthermore,
the
H2S,
ppm
< 500
< 500
strong
signal
enabled
bydirect
directto
switch
technology
allowed
theRosemount
Rosemount
strong
enabled
by
switch
technology
allowed
the
strong
signal
enabled
by
direct
switch
technology
allowed
the
Rosemount
5300to
toaccurately
accuratelymeasure
measureininturbulent
turbulentconditions.
conditions.
Other gas compositions on request.
5300
5300 to accurately measure in turbulent conditions.
E.
ON
was
pleased
with
the
performance
of
the
Rosemount
5301
and
E. ON was pleased with the performance of the Rosemount 5301 and
E.
ON
was
pleased
with
the
performance
of
the
Rosemount
5301
and
Analyzer
Options
eventuallyreplaced
replacedthe
theelectronic
electronicdisplacer
displacerwith
withanother
anotherRosemount
Rosemount5301
5301
eventually
eventually
the
electronic
displacer
with
another
Rosemount
5301
The
analyzerreplaced
allows
the
measurement
of lower
and
upper
value and
Wobbe
Transmitter.
Business
results
included
reduction
maintenance
costs
for index. Results can
Transmitter.
Business
results
included
aareduction
ininheating
maintenance
costs
for
3 results
Transmitter.
Business
included
aother
reduction
incalibration
maintenance
costs
be
expressed
in
MJ/m
, BTU/ft
or
kcal/m
,does
units
on
request.
Values
can
befor
calculated for following
both
laborand
and
parts.
Since3the
the
GWR3does
not
need
calibration
and
both
labor
parts.
Since
GWR
not
need
and
both
laboraaand
Since
the GWR
does
not
need
calibration
and
combinations
of parts.
reference
temperatures
ofwere
combustion
and
metering:
15/15 °C, 0/0 °C, 15/0 °C, 25/0 °C,
provides
reliable
measurement,
they
were
able
to
maintain
process
provides
reliable
measurement,
they
able
to
maintain
process
provides
athereby
reliable
measurement,
they
ablepower
to maintain
process
20/20
°C, thereby
25/20
°C.minimizing
stability
minimizing
therisk
risk
reduced
power
generation,
stability
the
ofofwere
reduced
generation,
secondRosemount
Rosemount5301
5301replaces
replacesthe
theelectronic
electronic
AAsecond
stability
thereby
minimizing
the
risk
of
reduced
power
generation,
outages,and
andequipment
equipmentdamage.
damage.
Adisplacer.
second Rosemount 5301 replaces the electronic
outages,
displacer.
outages,
and equipment
damage.
Beside general
purpose solution,
flame proof housing for installation in ATEX Zone 1 anddisplacer.
Zone 2 and CSA
Class
I Div 2 or Zone 1 and Zone 2 is available. Optional features are auto-calibration, flow sensor with
RESOURCES
RESOURCES
RESOURCES
alarm
and an
internal sample
gas pump.
Emerson
Automation
Solutions
PowerIndustry
Industry
Emerson
Automation
Solutions
Power
Emerson
Automation Solutions Power Industry
Emerson.com/en-us/industries/automation/power-generation
Emerson.com/en-us/industries/automation/power-generation
Emerson.com/en-us/industries/automation/power-generation
Rosemount5300
5300Series
SeriesGuided
GuidedWave
WaveRadar
Radar
Rosemount
Rosemount
5300
Series
Guided
Wave
Radar
Emerson.com/catalog/en-us/rosemount-5300-gwr-transmitter
Emerson.com/catalog/en-us/rosemount-5300-gwr-transmitter
Emerson.com/catalog/en-us/rosemount-5300-gwr-transmitter
StandardTerms
Termsand
andConditions
ConditionsofofSale
Salecan
canbebefound
foundon
onthe
theTerms
Termsand
andConditions
ConditionsofofSale
Salepage.
page.
Standard
TheEmerson
Emersonlogo
logoisisa atrademark
trademarkand
andservice
servicemark
markofofEmerson
EmersonElectric
ElectricCo.
Co.
The
Standard
Terms
and
Conditions
of
Sale
can
be
found
on
the
Terms
and
Conditions
of
Sale
page.
Rosemountand
andRosemount
Rosemountlogotype
logotypeare
aretrademarks
trademarksofofEmerson.
Emerson.
Rosemount
The
Emerson
logoare
is athe
trademark
and
service
mark ofowners.
Emerson Electric Co.
Allother
othermarks
marks
propertyof
oftheir
their
respective
All
are the
property
respective
owners.
Rosemount
and
Rosemount
logotype
are
trademarks
of
Emerson.
2017Emerson.
Emerson.All
Allrights
rightsreserved.
reserved.
©©2017
All other marks are the property of their respective owners.
© 2017 Emerson. All rights reserved.
Linkedin.com/company/Emerson-Automation-Solutions
Linkedin.com/company/Emerson-Automation-Solutions
Twitter.com/Rosemount_News
Twitter.com/Rosemount_News
Linkedin.com/company/Emerson-Automation-Solutions
Facebook.com/Rosemount
Facebook.com/Rosemount
Twitter.com/Rosemount_News
Youtube.com/user/RosemountMeasurement
Youtube.com/user/RosemountMeasurement
Facebook.com/Rosemount
Google.com/+RosemountMeasurement
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EuropeRegional
RegionalOffice
Office
Europe
Emerson
Automation
Solutions
Emerson
Automation
Solutions
Europe
Regional
Office
EuropeGmbH
GmbH
Europe
Emerson
Automation Solutions
Google.com/+RosemountMeasurement
AsiaPacific
PacificRegional
RegionalOffice
Office
MiddleEast
Eastand
andAfrica
AfricaRegional
RegionalOffice
Office Asia
Middle
Emerson
Automation
Solutions
Emerson
Automation
Solutions
Automation
Solutions
Emerson
Automation
Asia
Pacific
Regional Office
Middle
East
and AfricaSolutions
Regional Office Emerson
AsiaPacific
Pacific
PteLtd
Ltd Solutions
Asia
Pte
Emerson
Automation
Emerson Automation Solutions
Shakopee,
MN55379,
55379,
USA
Shakopee,
MN
6021
Innovation
Blvd. USA
Europe
GmbH
Neuhofstrasse
19aP.O.
P.O.Box
Box1046
1046
Neuhofstrasse
19a
JebelAli
AliFree
Free
ZoneBox
- South
Jebel
- South
22
Emerson
FZEZone
P.O.
17033,
Pacific
Pte Ltd
1Pandan
Pandan
Crescent
1Asia
Crescent
+1800
800
999
9307
+1952
952906
9068888
8888
+1
999
9307
oror+1
Shakopee,
MN
55379,
USA
+1
952
949
7001
+1
952
949
7001
+1 800 999 9307 or +1 952 906 8888
CH6340
6340Baar,
Baar,Switzerland
Switzerland
CH
Neuhofstrasse
19a
P.O. Box 1046
+41
(0)41
41
7686111
6111
+41
(0)
768
CH 6340
Baar,
Switzerland
Dubai,
United
Arab-Emirates
Emirates
Dubai,
United
Arab
Jebel
Ali
Free Zone
South
2
+971
4
8118100
+971
4
8118100
Dubai, United Arab Emirates
128461
Singapore
1Singapore
Pandan 128461
Crescent
+656777
6777
8211
+65
8211
Singapore
128461
GlobalHeadquarters
Headquarters
Global
Emerson
AutomationSolutions
Solutions
Emerson
Automation
Global
Headquarters
Emerson
Automation
6021Innovation
Innovation
Blvd. Solutions
6021
Blvd.
[email protected]
[email protected]
+1
952 949 7001
[email protected]
00830-1500-4530,Rev
RevAA
AA
00830-1500-4530,
00830-1500-4530, Rev AA
0830-0000-0000, Rev AA
EmersonFZE
FZEP.O.
P.O.Box
Box17033,
17033,
Emerson
+41(0)
(0)41
41768
7686300
6300
+41
6111
[email protected]
[email protected]
+41
(0) 41 768 6300
+9714448865465
8865465
+971
+971
8118100
[email protected]
[email protected]
+971 4 8865465
+656777
67770947
0947
+65
+65
6777
8211
[email protected]
[email protected]
+65
6777 0947
[email protected]
[email protected]
[email protected]