Inlet-Residue-NGL Solutions for Natural Gas Processing ... Danalyzer Documents… ·...
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Inlet-Residue-NGL Solutions for Natural Gas Processing Applications Application Note Oil & Gas To optimize the efficiency and profitability of your natural gas processing plant you must account for the changing composition of the inlet gas as well as adjust the natural gas liguid (NGL) extraction efficiency to account for marketing conditions. The Inlet-Residue- NGL application for the 700XA gas chromatograph (GC) analyzes the inlet gas and the two product streams in a single field-mounted analyzer to provide real-time feedback to the control system and the operators. Using the live compositions from a single gas chromatograph enables tight control of product specifications thereby maximizing the economic return of the facility. Application Overview Natural gas processing involves removing acid gases such as H 2 S and CO 2 and water from the raw inlet gas and then extracting the condensates to produce natural gas, or residue or sales gases, and natural gas liquid (NGL) products. The composition of the inlet gas can vary significantly depending on which well-heads are flowing, the ambient conditions on the primary separators, and the operating state of the gathering network. The composition of the sales gas is constrained by the contract tariffs that typically limit the CO 2 and nitrogen levels, the energy content, and the hydrocarbon dew point. The NGL product will have virtually zero CO 2 and nitrogen, a small amount of methane, and varying amounts of the heavier hydrocarbons. To maximize the economic performance of your plant, you should be able to quickly adjust to the market prices for the various products that you extract. Typically, if the ethane price is high relative to the natural gas price, the plant will run in ethane recovery mode to produce as much ethane as possible from the NGL stream while filtering out as much methane as possible. If the ethane price is relatively low, the plant will run in “ethane rejection mode” and will produce ethane rich natural gas close to the upper energy and hydrocarbon dew-point pipeline tariffs. Historically, processing plants would run for months at a time in a single mode. However, due to the increasing variability in pricing and demand, plants that can quickly switch between modes can capitalize on short term fluctuations in the market and dramatically improve profitability. The 700XA GPIRN Solution Natural gas processing plants typically have one or two gas chromatographs operating at their facility. We often find that on site plant technicians and engineers do not have the time, training, or expertise to properly operate these complex scientific instruments, therefore increasing the risk of potential lost revenue opportunities or costly shutdowns. The Rosemount Analytical 700XA gas chromatograph configuration for Inlet-Residue-NGL applications or GPIRN for short, is engineered to eliminate complexity and designed to operate remotely and unattended without compromising repeatability. The inlet and residue streams are configured with a wide range of compositions, and the NGL analysis accounts for a wide variation in ethane and propane compositions found between the rejection and recovery modes without the need of operator assistance. See Table 1 for more details. The 700XA’s rugged hardware is designed to increase analytical capability and widens the range of analysis options in a field mounted GC with an ambient temperature rating of -4 to 140 °F (-20° to 60 °C). Whether the analyzer is installed out in the field close to the process or enclosed in a shelter, the 700XA is ideal for natural gas processing applications that require advanced analysis such as C9+ (with hydrocarbon dew point and cricondentherm calculations) or C6+ with H 2 S. Figure 1 – The Typical Process Flow of a Natural Gas Processing Facility Showing the Locations of the Sample Points for the Gas Chromatograph Residue (Sales Gas) NGL Inlet
Transcript of Inlet-Residue-NGL Solutions for Natural Gas Processing ... Danalyzer Documents… ·...
Inlet-Residue-NGL Solutions for Natural Gas Processing Applications
Application Note Oil & Gas
To optimize the efficiency and profitability of your natural gas processing plant you must account for the changing composition of the inlet gas as well as adjust the natural gas liguid (NGL) extraction efficiency to account for marketing conditions. The Inlet-Residue-NGL application for the 700XA gas chromatograph (GC) analyzes the inlet gas and the two product streams in a single field-mounted analyzer to provide real-time feedback to the control system and the operators. Using the live compositions from a single gas chromatograph enables tight control of product specifications thereby maximizing the economic return of the facility.
Application OverviewNatural gas processing involves removing acid gases such as H2S and CO2 and water from the raw inlet gas and then extracting the condensates to produce natural gas, or residue or sales gases, and natural gas liquid (NGL) products.
The composition of the inlet gas can vary significantly depending on which well-heads are flowing, the ambient conditions on the primary separators, and the operating state of the gathering network. The composition of the sales gas is constrained by the contract tariffs that typically limit the CO2 and nitrogen levels, the energy content, and the hydrocarbon dew point. The NGL product will have virtually zero CO2 and nitrogen, a small amount of methane, and varying amounts of the heavier hydrocarbons.
To maximize the economic performance of your plant, you should be able to quickly adjust to the market prices for the various products that you extract. Typically, if the ethane price is high relative to the natural gas price, the plant will run in ethane recovery mode to produce as much ethane as possible from the NGL stream while filtering out as much methane as possible. If the ethane price is relatively low, the plant will run in “ethane rejection mode” and will produce ethane rich natural gas close to the upper energy and hydrocarbon dew-point pipeline tariffs. Historically, processing plants would run for months at a time in a single mode. However, due to the increasing variability in pricing and demand, plants that can quickly switch between modes can capitalize on short term fluctuations in the market and dramatically improve profitability.
The 700XA GPIRN SolutionNatural gas processing plants typically have one or two gas chromatographs operating at their facility. We often find that on site plant technicians and engineers do not have the time, training, or expertise to properly operate these complex scientific instruments, therefore increasing the risk of potential lost revenue opportunities or costly shutdowns.
The Rosemount Analytical 700XA gas chromatograph configuration for Inlet-Residue-NGL applications or GPIRN for short, is engineered to eliminate complexity and designed to operate remotely and unattended without compromising repeatability. The inlet and residue streams are configured with a wide range of compositions, and the NGL analysis accounts for a wide variation in ethane and propane compositions found between the rejection and recovery modes without the need of operator assistance. See Table 1 for more details.
The 700XA’s rugged hardware is designed to increase analytical capability and widens the range of analysis options in a field mounted GC with an ambient temperature rating of -4 to 140 °F (-20° to 60 °C). Whether the analyzer is installed out in the field close to the process or enclosed in a shelter, the 700XA is ideal for natural gas processing applications that require advanced analysis such as C9+ (with hydrocarbon dew point and cricondentherm calculations) or C6+ with H2S.
Figure 1 – The Typical Process Flow of a Natural Gas Processing Facility Showing the Locations of the Sample Points for the Gas Chromatograph
Residue(Sales Gas)
NGL
Inlet
Oil & Gas
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Table 1 - Composition Ranges for the 700XA Inlet-Residue-NGL recommended application.
Inlet Sales/Gas Residue NGL Product
Nitrogen 0–10 0–10 –
Methane 75–100 75–100 0–5
Carbon Dioxide 0–10 0–10 0–1
Ethane 0–20 0–20 0–60
Propane 0–10 0–10 0–70
Isobutane 0–5 0–5 0–20
n-Butane 0–5 0–5 0–20
Isopentane 0–1 0–1 0–10
n-Pentane 0–1 0–1 0–10
Hexanes Plus (C6+) 0–0.7 0–0.7 0–10
System DesignThe sample system design is critical to the performance of any analyzer system and is an integral component of the Inlet-Residue-NGL application (see Table 1). Particulate filters, liquid filters, check-valves, and bypass flow rotameters are provided for the two vapor streams. Flow switches in the bypass flow can be included as an option. To ensure there is no contamination between the inlet gas and the residue gas sample streams, double-block-and-bleed solenoids are used to select between the calibration and vapor streams.
The liquid sample initially is conditioned through a liquid particulate filter with fast bypass loop and armored rotameter mounted externally to the main SHS enclosure. A very low volume side stream is passed into the vaporizing regulator mounted inside the SHS enclosure. The vaporized sample then passes through a manual ball valve that allows for the manual calibration of the liquid analysis.
The vaporized liquid sample is injected into the GC oven through a dedicated sample injection valve that is separate from the sample injection valve used for the inlet and residue streams.
Both of the sample injection valves vent through dedicated atmospheric referencing valves to enable the purging samples to be routed to a safe sample vent (such as to the flare or vapor recovery system) while enabling the sample loop to be referenced to atmospheric pressure prior to injection into the analytical flow path to ensure accurate and repeatable measurements.
All of the vapor state sample handling components are mounted inside a stainless steel heated cabinet that can optionally include a viewing window for easy system checks and can be incorporated into the 700XA gas chromatograph, or mounted remotely.
Figure 2– A 700XA Configured for the GPIRN Application that is Suitable for Mounting in a Three-sided Shelter, a GC Cabinet, or an Analyzer House.
Figure 3 – GPIRN Sample System
Oil & Gas
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700XA Specifications and DrawingsPlease consult Rosemount Analytical if your requirements are outside the specifications listed below. Improved performance, other products and material offerings may be available depending on the application.
Communications (Standard) � Ethernet: Two ports – one RJ-45 and one four-wire
with 10/100 mbps � Analog inputs: Two standard isolated inputs filtered with transient
protection, 4–20 mA (user scalable and assignable) � Analog outputs: Six isolated outputs, 4–20 mA � Digital inputs: Five inputs, user assignable, optically isolated,
rated to 30V DC @ 0.5 A � Digital outputs: Five user-assignable outputs, Form C and
electromechanically isolated, 24V DC � Serial: Three termination blocks, configurable as RS-232, RS-422 or
RS-485 and one RS-232 D-sub (9-pin) Modbus/PC Connection
Communications (Optional)Two expansion slots available for additional communications.Each slot has the capacity to add one of the following:
� Four analog inputs (isolated) card
� Four analog outputs (isolated) card
� Eight digital inputs (isolated) card
� Five digital outputs (isolated) card
� One RS-232, RS-422 or RS-485 serial connection card
� One modem card, 300-19.2k baud
Additionally, a FOUNDATION™ fieldbus module is available.
Memory Capacity: 1 GB of flash memory for data storage; 128 MB of SDRAM system memory with 2 MB static RAM (battery-backed)
ConstructionEnvironmental temperature: -20° to 60 °C (-4° to 140 °F)
Environmental temperature without safety certification: 40° to 60 °C (-40° to 140 °F)
Enclosure Protection Rating: IP66
• Dimensions (without sample system):
• Wall-mount: 711 mm H x 445 mm W x 498 mm D
(28'' H x 17.5'' W x 19.6'' D)
• Pipe-mount: 711 mm H x 445 mm W x 671 mm D
(28'' H x 17.5'' W x 26.4'' D)
• Floor-mount: 1532 mm H x 445 mm W x 612 mm D
(60.3'' H x 17.5'' W x 24.1'' D)
Corrosion Protection:
•GCEnclosureMaterial: Copper free aluminum coated with industrial grade powder coat suitable for high humidity and salt- laden environments.
•ProcessWettedMaterials: Stainless steel. Where the function of an item excludes the use of stainless steel (e.g. glass rotameter tubes), materials that are resistant to corrosion are used.
•Electronics:All electronic circuit boards are tropicalized with a clear conformal coating.
Mounting: Floor-standing (standard), wall- or pipe-mount (optional)
Approximate Weight (without sample system): 50 kg (110 lbs.)
Area Safety Certification Options:*
� CSA: – USA and Canada
• Class I, Division 1, Groups B, C, and D � ATEX / IECEx
– Ex II 2G – Ex d IIC Gb T6
(Ta = -20 °C to 60 °C)
*Stated T-ratings can vary based on applications.
Performance CapabilitiesOven: Airless, maximum 150 °C (302 °F)Valves: Six-port and ten-port diaphragm chromatograph valves. Other types of valves, such as liquid injection or rotary valves, may be used depending on the application
Carrier Gas: Application-dependent. Typically zero-grade helium, nitrogen, or hydrogen
Sample & Calibration Gas Input Pressure Range:
0.2068–2.0684 bar: 1.0342 bar (recommended) or 15 psig
Carrier Gas Input Pressure Range (recommended): 6.2052–6.8947 bar (90–100 psig)
ElectronicsPower:
� Standard: 24V DC (21–30V DC)
� Optional: 90–264V AC, 47–63 Hz
Typical Power Consumption at 22 °C (72 °F): � Startup: 105 Watts DC (125 Watts AC) � Steady State: 35 Watts DC (40 Watts AC)
Note: Add 15.5 Watts DC (18 Watts AC) for LOI
Touch Key Local Operator Interface (Optional) The 700XA local operator interface (LOI) allows for maintenance and
operation of a 700XA without a laptop or PC. The LOI is a state-of-the-art
high resolution color display that is touch key infrared activated and supports
all core GC operations.
Detector: Thermal conductivity detector (TCD), flame ionization detector (FID), TCD/TCD or TCD/FID dual detector configurations possible; flame photometric detector (FPD) available.
Gating Options: Fixed-time, slope sensing gating of peaks
Streams: Up to 20 externally controlled streams or up to 8 internal (includes calibration stream)
Chromatograms stored/archived internally: Stores over 80 days of analysis report data and up to 2500 individual chromatograms.
Oil & Gas
Option SelectionUse the matrix below to choose the options for your application and build up the model string to order.
700XA -GPSCS -
1
--
2
--
3
--
4
--
5
--
6
--
7
--
8
--
9
GPIRNGPIRN
700XA 700XA Process Gas Chromatograph
Level 1 Hazardous Area Approval
A ATEX/IEC-Ex
C CSA rated
Level 2 Mounting
F Floor-mount
P Pipe-mount
W Wall-mountLevel 3 Power
AC Universal 85 to 240V AC
DC 24V DCLevel 4 Front Panel
EN Extended switch panel - 18 streams switches and FID ignite button (ignitor not used inless option XX-YY are chosen on level 12)
SK Local Operator Interface (LCD)
SN Standard switch panel - eight stream switches - not available when an FID option is selected on Level 12
Level 5 Additional* I/O and Serial/Modem Communications - Slot A
5A Additional I/O Port - Four Additional Channels of Analog Inputs (Isolated)
5D Additional I/O Port - Eight Additional Channels of Digital Inputs (Isolated)
5M Modem5N None5P Additional I/O Port - Four Additional Channels of Analog Outputs
(Isolated)5R Additional Serial Port - (1) RS422 or 485 (Factory/Field
configurable) 5S Additional Serial Port - (1) RS2325T Additional I/O Port - Five Additional Channels of Digital Outputs
(Isolated)
Level 6 Additional* I/O and Serial/Modem Communications - Slot B6A Additional I/O Port - Four Additional Channels of Analog Inputs
(Isolated)6D Additional I/O Port - Eight Additional Channels of Digital Inputs
(Isolated)6M Modem6N None6P Additional I/O Port - Four Additional Channels of Analog Outputs
(Isolated)6R Additional Serial Port - (1) RS422 or 485 (Factory/Field
configurable) 6S Additional Serial Port - (1) RS2326T Additional I/O Port - Five Additional Channels of Digital Outputs
(Isolated)
Level 7 FOUNDATION™ Fieldbus Interface
1F Interface Module
Level 8 Sample System Mounting LocationL Local Sample System - Sample System mounted under GC, with
tubing and signaling connections by RAIR Remote Sample Handling System - Includes an external junction
box for SHS signal wiring, attached to the 700XA. Signal Wiring and tubing connections are others.
Level 9 Gas Processing Application
GPIRN Gas Processing - Inlet Residue NGL (three streams)
GPDET DeEthanizer Tower Overheads and Bottoms (two streams)GPEPS Ethane Purity
GPPPS Propane Purity
GPPPX Propane Purity Extended (with Propylene)
GPSCS Sample Conditioning System for 700XA- Gas Processing Applications
Level 1 Gas Processing Application SHS typeGPIRN Inlet/Residue/NGLGPDET DeEthanizer TowerGPEPS Ethan PurityGPPPS Propane PurityGPPPX Propane Purity Extended (with Propylene)
Level 2 Hazardous AreaA Local Sample SystemC CSA rated components - Class I, Division 1, Groups B, C, D
Level 3 MountingLS1 Local Sample System - Sample System mounted under GC, with
tubing and signaling connections by RAIRS1 Remote Sample Handling Sysem - Includes external junction
box, with signal wiring and tubing connection by others.
Level 4 PowerA1 110V ACA2 220V AC
Level 5 WindowPL Plexiglass - Lexan
Level 6 Vapor Flow SwitchesV1 Single Vapor Flow SwitchV2 Two Vapor Flow SwitchesV3 Three Vapor Flow SwitchesV4 Four Vapor Flow Switches
Level 7 Vapor Sample EntryH1 Single Vapor Heat Trace BootH2 Two Vapor Heat Trace BootsH3 Three Vapor Heat BootsH4 Four Vapor Heat Trace BootsB ⅛ Bulkhead Fittings
Level 8 Liquid Flow SwitchesL1 Single Liquid Flow SwitchL2 Two Liquid Flow SwitchL3 Three Liquid Flow SwitchesL4 Four Liquid Flow Switches
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Optional Accessories
Vapor Sample ProbeProvide line size, process connection details, process pressure and temperature.
Vapor Sample Probe/Regulator
Provide line size, process connection details, process pressure and temperature.
Vaporizing Regulator For remote mount at the sample pointHeating Sample Probe For vapor samples. To be mounted at the sample point.Liquid Sample Probe Provide line size and process connection details.Heat Traced Sample Line
⅛th Stainless steel heat traced sample tubing including termination kit. Specify length required.
(*) Standard Communications - 5 Di/ 5 DO/2 AI/ 6 AO (All Isolated and (3) RS422, RS422 or RS485 (Factory/Field configurable) serial ports.
Oil & Gas
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Recommended InstallationThe drawings below represent the minimum recommended installation guidelines for the 700XA Gas Chromatograph. Please consult Rosemount Analytical for detailed installation recommendations for your application.
Figure 4 – GPIRN OD Local
Figure 5 – GPIRN OD Remote
NGC_ANO_OilGas_700XA_GPIRN
Oil & Gas
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