The Micro GC refinery and natural gas analyser from Particle Test combines micro-machined injectors and detectors, and high resolution capillary columns into a compact, modular gas chromatgraph.
It analyses the individual components in sample gas and provides detailed reports of properties including composition, calorific value and density up to 10 times faster than a conventional GC system.
The hardware combined with Data System software and LAN interfacing, provides a powerful system complete with calorific value BTU or Mega Joule/m3) calculations and reporting according to GPA, ASTM and ISO standards.
There is no need to change the detector range to compensate for wide fluctuations in component concentration normally present in gas samples of various sources and types. Analysis of pressurised liquid samples, which are gases under standard temperature and pressure, is possible using optional sample conditioners.
Refinery gas analyser
Refinery gas samples are delivered to the sample inlet of the GC after passing through a sample conditioning system, which selectively removes any liquid fractions and particulate matter from the sample. This ensures that only gas phase sample is delivered to the RGA.
An internal vacuum pump draws this conditioned sample into each channel’s micro injector, when then injects the mixture onto each of the capillary columns for analysis. A complete analysis of hydrogen, saturated and olefinic hydrocarbons (C1-C5, and C6+ grouped peaks), plus fixed gases (O2, N2, CO, and CO2) is performed. Precise retention times and component areas translate into accurate component identification and quantification of the individual components present in refinery gas.
Four chromatographic modules are optimised and integrated to quickly separate and measure the individual components in refinery gas. Critical performance parameters such as sample volume, temperature and carrier gas pressure are precisely controlled to produce accurate and reliable measurements independent of ambient temperature and pressure. Vaporisation for gas introduction into the analyser.
Natural gas analyser
This analyser is applicable to natural gas samples from wellhead to pipeline-quality gas and Liquefied Petroleum Gas (LPG). Additionally, the analyser can handle Y-Grade Liquefied Natural Gas (LNG). Samples are easily introduced using sample cylinders, Tedlar bags or by direct connection to the pipeline or wellhead sampling points.
Two chromatographic modules are optimised and integrated to quickly separate and measure the individual components in natural gas. The analyser quickly separates and measures the permanent gases and hydrocarbons present using an optimised, dual-channel portable gas chromatograph.
This powerful, yet easy-to-use configuration is equally applicable to a wide range of sample types including pipeline gas, wellhead gas, LPG and Y-grade liquefied natural gas. Wellhead samples, or samples taken directly from the gas well, often contain significant amounts of hydrogen sulfide, yet there are no interferences and H2S can be measured from 50 PPM to 30 mol%. The portable GC uses digital signal processing with an expanded dynamic range.
For analysis of LPG, a heated vaporiser provides the backpressure necessary to ensure representative sampling and vaporisation for gas introduction into the analyser. For Y-Grade LNG, a de-methanised natural gas liquid under pressure which contains significant amounts of C6 plus material, an optional heated vaporiser interface is used to maintain sample integrity and provide the heat necessary.