Gas Treatment Plant Chris, Stephanie, Mariam, Kyle Mentor: Jerry Palmer.

Gas Treatment Plant

Chris, Stephanie, Mariam, KyleMentor: 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 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

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 GPM

o 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 HP

Refrigeration = 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