06_claus tail gas treating units switching to low temperature tail gas operation proceedings.pdf
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Claus Tail Gas Treating Units: Switching to Low Temperature
Tail Gas Operation
Eric Roisin
1
Agenda
2
• Tail Gas Treatment by Hydrogenation
• Industrial Operation Feedback - BP Germany
• Catalyst Drop-in in Existing unit
• New Unit
• Conclusion
• Feed the right amount of air
• Load the most appropriate Claus catalysts
• Implement a Tail Gas Treatment solution
3
> 99.8%
Three Drivers for Maximum Sulfur Recovery
Hydrogenation Based TGTU
4
TG 103/133
air
fuel gas
Claus Tail Gas steam
water
to SWS
to incinerator Recycle to
Claus furnace
Reactor Section Amine Section
Qu
en
ch c
olu
mn
Ab
sorb
er
Reg
ener
ato
r
270-300°C
LT Catalyst Porfolio
Market leading catalysts
TG 107 High density High activity TG 136 Low density Low pressure drop
5
A Revolution for Existing / New Units
6
TG 107/136
air
fuel gas
steam
water
to SWS
to incinerator
Recycle to Claus
furnace
Reactor Section Amine Section
Qu
en
ch c
olu
mn
Ab
sorb
er
Reg
ener
ato
r
Claus Tail Gas
210-240°C
A Revolution for Existing / New Units
7
TG 107/136
air
fuel gas
steam
water
Reactor Section
Steam reheater
Claus Tail Gas
Operation at low temperature
• 40 % savings on energy
• Lower CO2 emissions
• Higher Temp. safety margin
From direct to indirect reheater
• Less risk of misoperations
(soot or excess air)
• Longer catalyst lifetime
• Equipment downsized 10%
• Capex reduction 10-15%
• OpEx reduction 20%
Ref.: Marco van Son, Sept. 15th 2005 Brimstone,
Vail (CO)
210-240°C
Agenda
8
• Tail Gas Treatment by Hydrogenation
• Industrial Operation Feedback - BP Germany
• Catalyst Drop-in in Existing unit
• New Unit
• Conclusion
Industrial Operation Feedback
9
Catalyst Drop-in at BP Germany
• Operating history from BP Gelsenkirchen
• Study undertaken by Jacobs-Comprimo to
revamp SRU & TGTU in 2003
• New SRU/TGTU train required
• Pilot studies demonstrated high performances
of TG 107
• BP decided to install a load of TG 107 in train # 4 TGTU Start up June 2004
• Existing refinery unit with a direct fired reheater
10
SRU 4 – TGTU Performances with Previous Catalyst
11
SRU 4 - Reactor Temperature Profile with Previous Catalyst
12
Temp. in
Temp. bottom
SRU 4 - Reactor Temperature Profile with TG 107
13
-60°C
Temp. in
Temp. bottom
SRU 4 – TGTU performances with TG 107
14
Outcomes of the First Trial
• One year of testing, various temperature,
conditions, H2S/SO2 ratios, burning
stoichiometry...
• 240°C kept as maximum temperature, allowing
the construction of a unit equipped with steam
reheater
15
Catalyst load still in operation after 9 years
New Unit in BP Germany
2006-2007 Erection of SRU 5 plant
New unit with indirect 40 barg steam reheater
16
SRU 5 - Reactor Temperature Profile with TG 107
17
Temp. in
Temp. bottom
SRU 5 – TGTU Performances with TG 107
18
New Unit in BP Germany
• SRU 5 unit is still delivering
• Inlet temperature still @220°C today
“More than 20 years of operating experience with low temperature catalysts” M. Schmidt, Sulphur, Berlin, 28-31/10/2012
130,000 GJ saved on fuel gas
1,000 tpy CO2 reduction
19
TG 107 benefits confirmed by 6 years of operation
TG 107’s performances are widely recognized
TG 107 &TG 136 Always Benefit (1/2)
For existing units:
• Operating cost savings
• Lower CO2 emissions
Case study for a 320 t/day plant in Canada (2009)
• Fuel gas savings: 440 ton/year
• CO2 emission reduction: 1210 ton/year
• Cost savings (excluding CO2 credits):
• Improved operation reliability
20
410 000 $ per year
TG 107 &TG 136 Always Benefit (2/2)
Additional benefit for new units:
• Simplified design
10-15% savings on installation cost
• Minimized risk of misoperation
21
Axens catalyst development
allowed this revolution in the
design of Claus TGTUs
Switching to LT Operation with Axens
TG 136:
• Industrial feedback from Imperial
Sarnia published in LRGCC 2012
22
New LT design widely accepted by
every TGTU stakeholder
TG 107:
• 9 years of continuous operation
for the first reference
Proven Performances at 210-240°C
23
Axens pioneered every catalyst evolution
• Alumina: CR-3S
• TiO2: CRS 31 and now CRS 31 TL
• BTX management: CSM 31
• LT hydrogenation: TG 107 and TG 136
Driving Sulfur Recovery Towards Excellence
Sulfur recovery catalyst world leader
Claus Tail Gas Treating Units Switching to Low Temperature
Tail Gas Operation
Eric Roisin
24
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