SS2100 - CO2 Raw Gas Feed Analyzer Solution

Application Note

Natural Gas Processing Plants
Regardless of the process downstream for Natural Gas Liquids extraction or Liquefied Natural Gas production, one of the first steps in a typical gas plant is acid gas (H2S and CO2) reduction and control.
Critical Control of CO2 There are a variety of H2S and CO2 reduction systems, some using liquid scrubbers such as amines or solvents, or fixed adsorbent beds, but the optimal operation of these systems requires an on-line measurement of the acid gas loading.

 Traditional Measurement Solutions
On-line gas chromatographs are the traditional method widely used for monitoring the levels of CO2. However, even with the latest in chromatography techniques and dedicating a GC to only the measurement of CO2, the analysis can take 3-6 minutes between measurement updates. Due to rapid changes in the acid gas concentration, this delay may not be acceptable. Gas chromatographs consume carrier gases, so the consumable costs of GC’s are high. Non-dispersive IR Spectroscopic methods using broadband light sources and narrow band pass filters have been used but are prone to interferences from changing background concentrations.

 SpectraSensors’ Solution
The SpectraSensors SS2100 offers a new solution to this control measurement. There are no cylinder gases to replace on a routine basis, so the analyzer is very low maintenance and has a low cost of ownership over the life of the analyzer. The high resolution that is inherent to TDL technology eliminates errors due to interferences that have hampered other spectrometric approaches. Tunable Diode Laser technology means that analysis is fast; results can be updated every second if desired.

Validation
The Analyzer measurement can be validated using a certified blend of CO2 in a balance that matches the typical background of the sample.

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Data Sheet

Performance
Target Components	CO2 in Raw Natural Feed Gas
Typical Measurement Ranges	>0 – 100 ppm* (specify range)
Typical Precision	±2% of Full Scale*
Measurement Response Time	1 to ~60 sec
Principle of Measurement	Tunable Diode Laser Absorption Spectroscopy Non-differential
Environmental Temperature Range	-20º to 50ºC (-4º to 122ºF) -10º to 60ºC (14º to 140ºF) optional
Sample Inlet Pressure	70 kPag (10 psig) typical 210 kPag (30 psig) maximum
Cell Temperature	Maintain at 50ºC +/- 0.2ºC
Maximum Cell Pressure	70 kPag (10 PSIg)
Sample Flow Rate	3 - 4 L/min (6.4 to 8.5 scfh)*
Validation	Certified blend of CO2 in a balance that matches the sample
Electrical
Power	100-240 VAC, 50-60 Hz standard
Max Current	Controller: 1 A @ 120 VAC
Controller to Cell Cable Length	1m standard (3m, 5m & 10m available optionally)
Communication	Current Loop Output 4-20 mA Isolated, 1200 ohms @ 24 VDC max load Serial: ASCII Text RS232C standard Modbus RS232C
Digital Outputs	4 ea. 12 VDC for valve operations Scrubber (if required), Process/Val, Val 1, Val 2 5 SPDT (Form C) Dry Contact Alarms Common Fault, Val 1 Active, Val 2 Active, Val Fail, one user-assignable to any alarm
LCD Display	Concentration, Cell Pressure and Temperature, Diagnostic Data
Physical
Controller Enclosure	NEMA 4X - 304 Stainless Steel standard
Controller Dimensions	343mm H x 305mm W x 165mm H (13.5" H x 12" W x 6-7/16" D)*
Weight Approximately	13.1 Kg (28.6 lbs)*
Sample Cell Dimensions	8m Herriot Cell 559 mm H × 127 mm W (22” H × 5” W)
Sample Cell Construction	316L Series Polished Stainless Steel standard
Number of Sample Cells	1 (single channel SS2100) or 2 (dual channel SS2100)
Area Classification	CSA Certified for Class I, Division 2, Groups ABCD Temp Code T3C  ll 2G Ex d llB+H2 T5; Tamb : -20 ÷ +60 °C
Dimensions with Sample System	1678 mm H x 613 mm W x 427 mm D (66” H x 24-1/8” W x 16-13/16” D)
Weight with Sample System (approx.)	68 kg (150 lbs.)
* Application specific; consult factory

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Drawings

Typical Accessories

Photos

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