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Nitrogen Rejection Plants - NRU1 AND NRU2

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Quantity: 2 Gas Plants
Product Location: Texas, United States

Seller Description

These Nitrogen Rejection Plants are available for sale by owner. Contact trader for more information. Details noted below: 

  • Includes two Nitrogen Rejection units 
  • Contracts with Operators prearraged if buyer accepts to proceed with provided Operators
  • Located near Midland, Texas

DESIGN SUMMARY NRU #1: 
NRU #1 is a BCCK designed Nitrogen rejection plant designed for an inlet volume of 6 MMCF/D of natural gas containing 20-30% Nitrogen at 600 psig. The plant is designed to perform at 98% thermal efficiency. Below is a brief description of the operation of the plant and equipment inventory. 

A. GAS COMPRESSION Gas gathering lines bring the gas to the plant inlet separators which remove gas condensate and water that may condense from the gas stream. Inlet gas compressors are configured with 2 stages of gas compression to boost the inlet gas to the inlet plant operating pressure of 600 psig. Note that the gas compression has been removed from the site and is not available for sale.

B. GAS DEHYDRATION

The BCCK nitrogen rejection process is a low temperature process which requires removal of saturated water in the gas stream to very low levels to avoid hydration formation in the plant process. High pressure gas from the compressors enters the dehydration skid. A filter separator removes fine levels of liquids that could damage the dehydration beds.  There are 2 gas dehydration beds, each filled with molecular sieve desiccant for absorption of the water vapor from the gas stream. The beds are cycled with one always in use to remove water from the inlet gas stream. Lower pressure gas is heated and passed through the vessel to regenerate the bed. Regeneration heat is provided by a small regeneration gas heater. 

 

C. NITROGEN/HYDROCARBON SEPARATION

The heart of the separation process is the nitrogen rejection column. The basis for the separation of nitrogen from hydrocarbons is the difference in boiling points. Nitrogen exits the top of the column in the vapor form while methane exits the column bottom as a liquid. The design of the heat exchange network combined with Joule Thompson expansion of the gas stream condenses the nitrogen in the gas stream. A considerable amount of hydrocarbons (primarily methane) are also condensed. The nitrogen rejection column is a 62’ tall vertical vessel. Packing sections are installed in the vessel to provide contact surface for boiling vapors and condensing liquids required for fine separation.  


The plant process utilizes Joule Thompson expansion of the inlet gas stream combined with a complex heat exchange network to achieve temperatures necessary to condense nitrogen from the vapor phase to liquid. The heat exchangers utilized by BCCK for this process are multi-stream plate fin exchangers. The exchangers are of aluminum construction to meet the low temperatures required for the process. 

he column minimizes methane losses in the reject nitrogen stream by the use of a BCCK proprietary overhead condenser. After heat exchange in one pass of the cold plate fin exchanger, a portion of the bottom methane product from the column is expanded in a secondary JT valve. This expansion achieves low temperatures which circulate through the condenser section providing cooling to condense methane vapors to minimize methane losses with the reject N2 stream. Heated vapors from a pass in the cold plate fin exchanger and a trim reboiler provide heat (in the form of heated stripping vapors) to the bottom of the column. These stripping vapors prevent excess nitrogen from leaving with the liquid hydrocarbon stream from the bottom of the column.  
The nitrogen reject stream from the top of the tower is warmed in the heat exchange network prior to being vented to atmosphere at an elevated point above the cold box.  


D. SALES GAS COMPRESSION AND DELIVERY


There are 2 hydrocarbon streams from the NRU process. After being vaporized and warmed to near plant inlet temperatures, the high pressure (HP) stream exits the NRU at approximately 250 psig and does not require compression. The low pressure (LP) stream from the plant consists of the side stream of the nitrogen rejection column bottom hydrocarbon product that was expanded across the secondary JT valve to provide column condensing duty. After being fully vaporized and warmed in the heat exchange network, the LP gas flows to the sales gas compressors.  Note that the sales gas compressors have been removed from the site and are not available for sale.  

 

DESIGN SUMMARY NRU #2: 
NRU #2 is a BCCK-designed nitrogen rejection plant with NGL recovery. The plant is designed for an inlet volume of 15 mmcfd of natural gas containing 20-30% nitrogen at 650 psig. The plant is designed to perform at 98% thermal efficiency. Below is a brief description of the operation of the plant and equipment inventory. 


A. GAS COMPRESSION
Gas gathering lines bring the gas to the plant inlet separators, which remove gas condensate and water that may condense from the gas stream. Inlet gas compressors are configured with 2 stages of gas compression to boost the inlet gas to the inlet plant operating pressure of 650 psig. Note the gas compression is not included in the asset sale. 


B. GAS DEHYDRATION
The nitrogen rejection process is a low temperature process which requires removal of saturated water in the gas stream to very low levels to avoid hydration formation in the plant process. High pressure gas from the gas compressor units enters the dehydration skid. A filter separator removes fine levels of liquids that could damage the dehydration beds.  There are 2 gas dehydration beds, each filled with molecular sieve desiccant for absorption of the water vapor from the gas stream. The beds are cycled with one in adsorption removing water from the inlet gas stream. Lower pressure gas is heated and passed through the off-cycle vessel to regenerate the bed. A small regeneration gas heater provides regeneration heat. 


C. NITROGEN/HYDROCARBON SEPARATION
The plant process utilizes Joule Thompson expansion of the inlet gas stream combined with a complex heat exchange network to achieve temperatures necessary to condense nitrogen from the vapor phase to liquid. The heat exchangers utilized by BCCK for this process are multi-stream plate fin exchangers. The exchangers are of aluminum construction to meet the low temperatures required for the process. 
The heart of the separation process is the nitrogen rejection column. The basis for the separation of nitrogen from hydrocarbons is the difference in boiling points. Nitrogen exits the top of the column in the vapor form while methane exits the column bottom as a liquid. The design of the heat exchange network combined with Joule Thompson expansion of the gas stream condenses the nitrogen in the gas stream. A considerable amount of hydrocarbons (primarily methane are also condensed). The nitrogen rejection column is a 62’ tall vertical vessel. Packing sections are installed in the vessel to provide contact surface for boiling vapors and condensing liquids required for fine separation.  

The column minimizes methane losses in the reject nitrogen stream by the use of a BCCK proprietary overhead condenser. After heat exchange in one pass of the cold plate fin exchanger, a portion of the bottom methane product from the column is expanded in a secondary JT valve. This expansion achieves low temperatures, which circulate through the condenser section providing cooling to condense methane vapors to minimize methane losses with the reject nitrogen stream. Heated vapors from a pass in the cold plate fin exchanger and a trim reboiler provide heat (in the form of heated stripping vapors) to the bottom of the column. These stripping vapors prevent excess nitrogen from leaving with the liquid hydrocarbon stream from the bottom of the column.  
The nitrogen reject stream from the top of the tower is warmed in the heat exchange network prior to being vented to the atmosphere at an elevated point above the cold box.  


D. NGL RECOVERY
The difference in the design of the Gaines County NRU Plant # 2 from the original Gaines County NRU Plant is that the NGL condensed in the plant process is not vaporized and commingled with the plant sales gas stream. Instead, these NGL’s are kept as liquid, routed to an on-site surge tank and delivered to a product NGL pipeline. The plant is designed to recover the following percentages of NGL’s from the inlet gas stream: 

Ethane – 30% 
Propane – 90% Butanes – 94% 
Natural Gasoline – 99%+

An external propane refrigeration circuit supplements plant cooling. Additionally, a NGL stabilizer column is required to trim light hydrocarbon components from the raw NGL stream in order to meet NGL pipeline quality specifications.

  
E. SALES GAS COMPRESSION AND DELIVERY
There are 2 hydrocarbon streams from the NRU process. After being vaporized and warmed to near plant inlet temperatures, the high pressure (HP) stream exits the NRU at approximately 250 psig and does not require compression. The low pressure (LP) stream from the plant consists of the side stream of the nitrogen rejection column bottom hydrocarbon product that was expanded across the secondary JT valve to provide column-condensing duty. After being fully vaporized and warmed in the heat exchange network, the LP gas flows to the sales gas compressors. The total gas stream (compressed LP and HP) is measured and delivered to the Northern Natural sales tie-in point.   Note the sales gas compression is not included in the asset sale. 

MAJOR PLANT EQUIPMENT (NRU #1 PROCESS PLANT EQUIPMENT ONLY)
EQUIPMENT TAG DESCRIPTION DETAILS
21-801
21-701
Waste Heat Recovery Unit
Regen Gas Cooler
Shell: 5 psig @ 1125 F
Tube: 660 psig @ 1125 F
Duty: 1.4 MMBTU/HR
DP: 660 psig @ 600F
Duty: 641 MBTU/HR
26.501
32-102A/B
Inlet Gas Coalescing Filter
Dehydrators
8” x 8’-2”
660 psig @ -20/200F
30” x 25’ S/S
660 psig @ -20/600F
32-201
21-201
Cold Separator
Warm Plate Fin EX
18” x 96”
660 psig @ -150/150 F
DP: 1100/400/260 psig
DT: -320/150F
21-202 Cold Plate Fin EX DP: 900/400/260 psig
DT: -320/150F
21-203
31-301
Trim Reboiler Shell: 660 psig
-320/150F
Tube: 400 psig
-320/150F
Duty: 1.5 MMBTU/HR
18” x 62’ S/S
400 psig @ -320/150F
29-301
21-301




No TAG
Vane Mist Extractor
Knockback Condenser




Regeneration Gas Heater

 
14” x 6” x 23”
33” x 10’
Shell: 260
psig
-320/150F
Tube: 400
psig
-320/150F
Duty: 250 MBTU/HR

 

MAJOR PLANT EQUIPMENT (NRU #2 PROCESS PLANT EQUIPMENT ONLY)
EQUIPMENT TAG DESCRIPTION DETAILS
32-501
32-502
Inlet Comp Discharge
Scrubber
Refrigeration Economizer
30” x 8’ S/S
800 psig @ -20/150 F
30” x 8’ S/S
800 psig @ -20/150F
21-502 NGL Reboiler Shell: 285 psig @ -20/450F
Tube: 800 psig @ -20/450F
26-101 Inlet Gas Coalescing Filter 14” x 120”
1100 psig @ -20/150F
32-101A/B Dehydrators 48” x 20’ S/S
1095psig @ -20/650F
26-102 Gas Dehy Outlet Filter 12” x 58” S/S
1100 psig @ -20/150F
32-102 Cold Separator 28” x 8’
1100 psig @ -320/150 F
21-201
21-202
Process Heat EX



Cold Plate Fin EX
3’ x 12’5”
1100 psig @ -320/150F
Duty: 2.257 MMBTU/HR
3’ x 12’-5”
1100 psig @ -320/150F
Duty: 2.257 MMBTU/HR
31-1102 NGL Stabilizer 14” x 25’
400 psig
21-203



31-301
Trim Reboiler



N2 Rejection Column
Shell: 660 psig
-320/150F
Tube: 400
psig
-320/150F
Duty: 1.5 MMBTU/HR
32” x 76’-6” S/S
400
psig @ -320/100F
29-301
21-301




42-801
32-803
Vane Mist Extractor
Knockback Condenser



Propane Refrig Comp
Propane Accumulator
14” x 6” x 23”
33” x 10’
Shell: 260
psig
-320/150F
Tube: 400
psig
-320/150F
Duty: 250 MBTU/HR
Two Stage 300 bhp
48” x 10’ 260
psig @ -20/150
33-907 NGL Surge Tank 30,000 gal.
144” x 36’
250
psig @ -20/150F
23-701
32-802
Regeneration Gas Heater
Fuel Gas Scrubber
1100 psig @ 800F
Duty: .89 MMBTU/HR

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