Transcript Presentation #3

Gas Treatment Plant
Chris, Stephanie, Mariam, Kyle
Mentor: Jerry Palmer
Report Outline
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Previous Questions
Block Flow Diagram
Detailed PFD's (stream #, components, P&T) for each
process
Energy sinks/loads, Equipment sizing, Cost in Aspen
estimator for one process -- Hydrocarbon recovery
Previous Questions
1. Sending 97% Nitrogen and 3% methane from Nitrogen
rejection stream to NH3 plant.
2.Using thermal swing adsorber instead of a pressure
swing adsorber.
To prevent the loss of feed gas in the bed during
depressurization and also,the short time cycle in PSA
can cause rapid re-pressurization that will lead to
transient variation in the feed and product flow which will
affect the operation of the plant
3. Using only one turboexpander for Hydrocarbon recovery.
Basis : 310 MMSCFD
Revenues
Midrex : 103 kmol/day (Transfer Cost)
Syn Gas:111 kmol/day (Transfer Cost)
Nh3 PLant : 50.4 kmol/day (Transfer Cost)
CHP :195.4 kmol/day (Transfer Cost)
Pipeline:4.8 kmol/day ($3.80/MSCFD)
LNG: 5000 BBL/day ($10.40/BBL)
NGL: 48990 BBL/day (~$22/BBL)
Block Flow Diagram
PFD-002
PFD-003
Aspen Estimate-Demethanizer in
Hydrocarbon Recovery
Size:
Tower:
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Vessel Diameter: 8.5 ft
Vessel Height 66 ft
Liquid volume: 11,249.5 gallons
33 Trays
24 inches between trays
Condenser:
o Area: 22,980.6 ft^2
Reboiler:
o Area: 7,803.94 ft^2
o Tube length: 20 ft
Reflux Pump:
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Liquid flow rate: 1808.3 GPM
Efficiency: 70
Aspen Estimate-Demethanizer in
Hydrocarbon Recovery
Equipment Cost:
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Tower: $3,059,300
Condenser: $419,000
Reboiler: $268,000
Reflux Pump: $17,200
Total equipment cost for one Demethanizer
Column:
$3,763,500
Aspen Estimate-Demethanizer in
Hydrocarbon Recovery
Energy:
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Tower: 28.03 MMBTU/hr
Condenser: 22.7 MMBTU/hr
Reboiler: 5.3 MMBTU/hr
Reflux ratio: .35
Aspen Estimate-Demethanizer in
Hydrocarbon Recovery
Cost:
o Total operation cost:
19,031,900 $/year
o Total capital cost:
$12,567,400
Annotated Equipment List
Equipment
Description
Equipment
Description
Equipment
Description
Equipment
Description
AC-001
AIR COOLER
D-001
VAPOR-LIQUID
SEPARATOR
HX-003
HEAT
EXCHANGER
MS-001
MOLECULAR SIEVE
BED
C-001
DEMETHANIZE
R
D-002
VAPOR-LIQUID
SEPARATOR
HX-004
HEAT
EXCHANGER
MS-002
MOLECULAR SIEVE
BED
C-002
CRYOGENIC
DISTILLATION
COLUMN;
ASTM A353
D-003
VAPOR-LIQUID
SEPARATOR
HX-005
HEAT
EXCHANGER
MS-003
MOLECULAR SIEVE
BED
CMP-001
COMPRESSOR
D-004
INLETSEPARATOR
HX-006
HEAT
EXCHANGER
MS-004
MOLECULAR SIEVE
BED
CMP-002
COMPRESSOR
D-005
VAPOR-LIQUID
SEPARATOR
HX-007
HEATER
MS-005
MOLECULAR SIEVE
BED
CMP-003
COMPRESSOR
D-006
VAPOR-LIQUID
SEPARATOR
HX-008
BRAZED
ALUMINIUM
MS-006
MOLECULAR SIEVE
BED
CMP-004
COMPRESSOR
D-007
VAPOR-LIQUID
SEPARATOR
HX-009
BRAZED
ALUMINIUM
PMP-001
CMP-005
COMPRESSOR
D-008
PHASE
SEPARATOR
JT-001
JOULE
THOMPSON
VALVE
R-001
CHILLER
CMP-006
COMPRESSOR
D-009
VAPOR LIQUID
SEPARATOR
JT-002
RB-001
REBOILER
CMP-007
COMPRESSOR
HX-001
HEAT
EXCHANGER
M-001
MEMBRANE
CMP-008
COMPRESSOR
HX-002
HEAT
M-002
MEMBRANE
Energy Loads and Sinks
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PFD-001: Compression = 6888 HP
Heating = 1.7MMBTU/HR
PFD-002 and PFD-003: Estimated total of
139MMBTU/HR
PFD-004:Air Cooling =3.4MMBTU/HR
Compression = 880HP
Heating = 44.6MMBTU/HR
PFD-005: Refrigeration = 56.3 MMBTU/HR
PFD-006: Heating = 8 MMBTU/HR
PFD-007: Compression = 1260 HP
Refrigeration = 58 MMBTU/HR
PFD-008: Compression = 920HP
Major Equipment Costs
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6 molecular sieve Adsorbers installed
$ 6,690,000
24 Tray Nitrogen Rejection Column Installed
$2,300,000
Absorbing and Stripping Columns for MDEA
treatment, approximately 25 trays each
intstalled
$2,500,000
Q&A