STION IN ETHYLENE PRODUCTION
Continuous Emissions Monitoring Systems( CEMS), using the SERVOPRO 4900 9 10 11 12 and Servomex sample systems are used to measure the stack emissions for legislative requirements of O 2, CO, NOx and SOx. The 4900 can also be installed either side of a Selective Catalytic Reduction( SCR) unit to monitor the SCR’ s efficiency in reducing NOx emissions, while the SERVOTOUGH Laser 3 Plus Ammonia
13 monitors the NH3 level, which is allowed to“ slip” through the catalysis during the NOx reduction reaction.
On the outlet of the cracker unit a transfer line exchanger( TLE) rapidly cools the cracked gas to preserve the gas composition: a SpectraScan and H2Scan
14 monitor the gas quality after the cracking unit, ensuring the highest possible ethylene yield and to prevent undercracking or over-cracking.
After every 20 days or so of operation, the cracking furnaces need to be decoked since they acquire a coating of carbon over time and lose efficiency. This is done by burning off the coke with air in a steam atmosphere.
The progress of the decoking phase is monitored by measuring the amount of CO 2( 0-5 %) in the effluent. It rises as the carbon is burnt off and then reduces to zero when the furnaces are clean again, and the plant can be returned to normal operation.
During the decoke cycle a SpectraScan
14 with added CO2 channel can also be utilized to monitor CO 2 levels, as well as to ensure the shortest decoking cycle with real-time analysis, or a separate SpectraExact 15 can be utilized for this measurement.
X
er 3 Plus & CO
00 & NO X
Laser 3 Plus
O 2
& CO FluegasExact
O 2
& CO e
SpectraScan H2Scan C1 to C6 H 2
Common Stack
14 15
10
4900
O 2
, CO, NO X, SO X
SpectraExact SpectraScan H2Scan
CO 2
C1 to C6 H 2
Prolysis Probe
BENEFITS OF TDL TECHNOLOGY
Servomex’ s advanced TDL technologies offer significant advantages when applied as a combustion control solution for ethylene furnaces, maximizing efficiency whilst reducing greenhouse gas emissions.
The highly robust technique provides reliable measurement of combustion gases with less associated maintenance, while the location of the measurement close to the flame delivers the fastest response, optimizing combustion and minimizing fuel costs.
TDL technologies are particularly suitable for in-situ cross-stack measurements, with a typical cross-stack system consisting of the laser emitter module and receiver mounted across the process pipe line or flue stack.
TLE
AVAILABLE NOW:
The SERVOTOUGH Laser 3 Plus TDL range. See pages 6 and 7. raScan n C6 H 2
5
We have the solution for HP process- contact your local business center at servomex. com
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