gas treatment plant
Post on 23-Feb-2016
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Gas Treatment PlantChris, Stephanie, Mariam, Kyle
Mentor: Jerry Palmer
Report Outline
• 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 Questions1. 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
RevenuesMidrex : 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:o Vessel Diameter: 8.5 fto Vessel Height 66 fto Liquid volume: 11,249.5 gallonso 33 Trayso 24 inches between trays
Condenser:o Area: 22,980.6 ft^2
Reboiler:o Area: 7,803.94 ft^2o Tube length: 20 ft
Reflux Pump:o Liquid flow rate: 1808.3 GPMo Efficiency: 70
Aspen Estimate-Demethanizer in Hydrocarbon Recovery
Equipment Cost:o Tower: $3,059,300o Condenser: $419,000o Reboiler: $268,000o Reflux Pump: $17,200
Total equipment cost for one Demethanizer Column: $3,763,500
Aspen Estimate-Demethanizer in Hydrocarbon Recovery
Energy:o Tower: 28.03 MMBTU/hro Condenser: 22.7 MMBTU/hro Reboiler: 5.3 MMBTU/hro Reflux ratio: .35
Cost:o Total operation cost:
19,031,900 $/yearo Total capital cost:
$12,567,400
Aspen Estimate-Demethanizer in Hydrocarbon Recovery
Annotated Equipment ListEquipment 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 DEMETHANIZER
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 INLET- SEPARATOR
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 THOMPSONVALVE
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 EXCHANGER
M-002 MEMBRANE
Energy Loads and Sinks• 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 HPRefrigeration = 58 MMBTU/HR
• PFD-008: Compression = 920HP
Major Equipment Costs
• 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
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