Steam
COMBUSTION
COMBUSTION CONTROL IN ETHYLENE PRODUCTION
Precise and rapid analysis of process gases within an ethylene plant is vital to ensure optimum efficiency while maintaining the highest levels of safety . These efficiencies can be achieved in a variety of ways , including : shortening the residence time in the cracking furnace ; rapid adaptation to changing feed-stocks ; improving combustion control ; optimizing fractionation ; and improving process reliability . Safety can also be improved through fast , reliable process analysis technologies with high measurement availabilities .
Combustion control for the cracking furnace is provided through monitoring both oxygen and combustibles in flue
gases . This has been commonly achieved by utilizing a close-coupled extractive combustion analyzer capable of measuring both oxygen ( O 2
) and carbon monoxide ( CO ). In these analyzers , sensors are housed in a sensor head mounted on the process wall , to which a sample is aspirated via a sample probe , giving fast in-phase response of both O 2 and CO .
However , the advent of Tunable Diode Laser ( TDL ) technologies now allows a pathaveraged combustion measurement of
O 2
, CO and CH 4 to be made in-situ of the process . TDL offers a highly stable measurement at very low concentrations , a reduction in cross-interference from other gases and a fast , continuous measurement .
Furnace wall vibration or thermal expansion can cause measurement failure for basic TDL technologies , due to the movement of the wall on which the analyzer is mounted resulting in a reduction or variation in laser light falling on the laser detector .
Servomex ’ s TDL analyzers , including the new SERVOTOUGH Laser 3 Plus range , avoid this problem by allowing the laser transmitter optics to diverge the laser beam , ensuring the receiver remains unaffected by thermal movements and vibrations of the process .
This offers a significant advantage to Servomex ’ s TDL analyzers as a combustion control solution for ethylene furnaces .
SERVOMEX SOLUTIONS FOR COMBUSTION ANALYSIS IN ETHYLENE PRODUCTION
SERVOTOUGH SpectraScan 2400
SERVOTOUGH SpectraExact 2500
SERVOTOUGH FluegasExact 2700
Revolutionary inline real-time analysis of hydrocarbon components .
H2Scan
Reliable real-time photometric analysis of corrosive , toxic and flammable gas streams .
SERVOTOUGH Laser 3 Plus Analyzers
Advanced fluegas analyzer for high temperature measurements of O 2 and combustibles .
SERVOPRO 4900
Explosion-proof inline hydrogen process analyzer which complements the SpectraScan 2400 .
Full-featured TDL monitor providing fast , accurate combustion gas measurements .
Continuous Emissions Monitoring ( CEMS ) analysis of multiple flue gas components .
2 X X 2 X
Fuel
FluegasExact O 2 & CO e
SpectraScan H2Scan C1 to C6 H 2
SCR
Laser 3 Plus O 2 & CO
4900 O 2 & NO X
Laser 3 Plus O 2 & CO
FluegasExact O 2 & CO e
Common Stack
SpectraScan Spect H2Scan Spect C1 to C6 H H2Sca 2
CO 2 C1
See our analyzers across the process OVERLEAF
SpectraExact
Feed Treating ppm CO 2
SpectraScan C1 to C6
Recycle Ethane
TLE
P11