Raman Gas Analyzer System

Raman Gas Analyzer System | LNG Raman Spectroscopy | Cromatograph scientific instruments RGAS

The Raman Gas Analyzer System promises to change the way natural gas is measured. Raman spectroscopy is an indispensable tool for buyers and sellers interested in managing monetary risk as well as for process managers desiring to increase production efficiencies.

The Raman Gas Analyzer System (RGAS) measures the composition of natural gas. The system is based upon equipment that has been successfully deployed at industrial sites for more than ten years. The laser-based analyzer has been outfitted with a predictive algorithm for natural gas and has now been introduced to the energy sector. The RGAS displaces gas chromatograph-based (GC) measurement equipment in select Liquid Natural Gas (LNG) and Natural Gas (NG) sampling applications.

Using Raman spectroscopy represents major advances in the quality of on-site composition analysis. This system has the accuracy, stability, repeatability and speed to quickly deliver laboratory-grade measurements to an online installation. Furthermore, the system decreases the day-to-day operational effort required to maintain measurement quality.

The natural gas industry demands solid analytical tools. Natural gas energy content calculations and processing equipment efficiencies depend on the quality of the measurements taken. Until now, measurements have been limited to those produced by gas chromatograph-based equipment. Raman spectroscopy raises the standard by providing better measurements with less effort. This equates to decreased monetary risk in custody transfer and inventory control scenarios, and greater efficiency in product processing applications.

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  • MEASUREMENT QUALITY
  • Raman spectroscopy performance has been proven for over 10
    years in industrial environments. The algorithm was developed
    in the laboratory and its accuracy has been verified in the field.
    Systems installed at LNG terminals confer a high degree of
    confidence because the equipment deployed in the field is
    exactly the same equipment used in a controlled laboratory
    setting. All equipment measurements are standardized as all
    units are calibrated by NIST traceable equipment. This is not
    the case for vaporizer-GC systems. Furthermore, the RGAS
    takes measurements directly in the liquid in LNG applications.
    This approach avoids the uncertainties introduced by the
    vaporizer and accumulator.The stability of Raman spectroscopy in LNG applications is not affected by either extreme ranges or rapid changes in flow rate and pressure. In contrast, the vaporizer and accumulator utilized in GC-based systems are adversely affected by these states.The standard deviation of LNG BTU measurements, as evaluated in the field, is typically 0.25 for all conditions. A GC will typically show much higher variation depending on the flow rate, pressure and composition states of the product.

    The speed of Raman spectroscopy is reflected in extemely fast update times. Update times of 12 seconds have been observed in optimized environments. The GC almost universally requires a minimum 5 minute update time.

  • *These factors contribute to higher certainty & faster information feeds for natural gas measurements.
  • MEASUREMENT MAINTENANCE
  • The analyzer is engineered with optical and solid state devices resulting in a very robust system that requires very little maintenance.
    After commissioning, the Raman spectroscopy analyzer is self-calibrating. There are no consumables except for the laser which has a service life of five or more
    years, depending on usage. Routine maintenance is limited to dusting ventilation fans and checking coolant levels. Very little training is
    required for proper operation. All of these features ensure low life-cycle costs.
  • ENERGY CONTENT
  • The optical analyzer identifies the molecular composition of the
    product. This is a common step in calculating energy content and
    tracking product inventory. Since flow rate does not adversely
    affect Raman produced measurements, the product measurements
    taken during the ramp-up and ramp-down phases of the transfer
    are valid and may be used for product price calculations.Custody transfer standards disallow the use of measurements during
    this time for vaporizer-GC measuring equipment because the
    equipment does not function well under these conditions. For the
    first time, measurements taken during the entire transfer process
    can be incorporated in the energy content calculation. Furthermore,
    the pressure differences produced by land-based and ship-based
    pumps will not effect RGAS produced measurements.Depending on the vaporizer-GC design, these differing pressures
    may result in measuring the same product differently. The RGAS
    produces practically no outlier measurements. The update time is
    typically 5 to 10 times faster than GC-based equipment, further
    increasing the amount of usable data. Trading partners can rest
    assured that the analysis is correct because the measurements
    are thorough and are taken by NIST calibrated equipment. Raman spectroscopy raises the confidence level of trading partners by
    minimizing the risk of monetary loss due to poor measurements.
  • PROCESS CONTROL
  • Laser-based measuring is inherently fast. The Raman analyzer is
    then ideally suited for on-line monitoring of continuous processes
    operating at high rates.Possible applications include LN2 blending and LPG spiking. Raman spectroscopy system’s ability to provide real-time, actionable information allows
    altering of the energy content as the product is transferred to the
    cargo ship or distribution network. Exporters and importers are
    now empowered with the option of trading product with a wider
    range of energy content, thereby opening untapped markets
    and sources. Composition measurements for liquefaction and
    vaporization processes will also benefit from the speed of the
    Raman system.In general, processing equipment may be operated with increased
    efficiency and safety due to faster information feeds.

  • SYSTEM DESCRIPTION AND INSTALLATION
  • The Raman spectroscopy system is comprised of a probe, a fiber optic cable and a base unit. The probe is inserted into a transfer pipe at the desired
    sampling location. One base unit is capable of sampling at four locations allowing one to leverage the
    investment. Communication is possible with Data Acquisition Systems via standard protocols.
    Programmable Logic Controllers may be embedded in analyzer units. ATEX hardware and
    certification is available for installation in hazardous environments.

Summary

The Raman Gas Analyzer System promises to change the way natural gas is measured. Raman spectroscopy is an indispensable tool for buyers and sellers interested in managing monetary risk as well as for process managers desiring to increase production efficiencies.

For more information, please send us an email or call us at 1-800-466-6031. A Scientific Instruments associate will be happy to assist you.

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The optical analyzer identifies the molecular composition of the product. This is a common step in calculating energy content and tracking product inventory. Since flow rate does not adversely affect Raman produced measurements, the product measurements taken during the ramp-up and ramp-down phases of the transfer are valid and may be used for product price calculations.

Custody transfer standards disallow the use of measurements during this time for vaporizer-GC measuring equipment because the equipment does not function well under these conditions. For the first time, measurements taken during the entire transfer process can be incorporated in the energy content calculation. Furthermore, the pressure differences produced by land-based and ship-based pumps will not effect RGAS produced measurements.

Depending on the vaporizer-GC design, these differing pressures may result in measuring the same product differently. The RGAS produces practically no outlier measurements. The update time is typically 5 to 10 times faster than GC-based equipment, further increasing the amount of usable data. Trading partners can rest assured that the analysis is correct because the measurements are thorough and are taken by NIST calibrated equipment. Raman spectroscopy raises the confidence level of trading partners by minimizing the risk of monetary loss due to poor measurements.

Laser-based measuring is inherently fast. The Raman analyzer is then ideally suited for on-line monitoring of continuous processes operating at high rates.

Possible applications include LN2 blending and LPG spiking. Raman spectroscopy system’s ability to provide real-time, actionable information allows altering of the energy content as the product is transferred to the cargo ship or distribution network. Exporters and importers are now empowered with the option of trading product with a wider range of energy content, thereby opening untapped markets and sources. Composition measurements for liquefaction and vaporization processes will also benefit from the speed of the Raman system.

In general, processing equipment may be operated with increased efficiency and safety due to faster information feeds.