Gas chromatography (GC), is used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture (the relative amounts of such components can also be determined).

Chromatograph

The objective of the analyzation of natural gas by gas chromatography is to obtain a sample from the system in question and analyze the product.

All sampling systems have certain requirements, sample probes are always recommended to be used and inserted into the middle 1/3 of the pipeline when taking a sample of any type. Sample probes should be 5 times the pipe diameter downstream of any obstruction.>

GPA Method 2261 (Analysis for Natural gas and Similar Gaseous Mixtures by Gas Chromatography) is the standard for analyzing natural gas.

Accurate determination of fuel gas composition allows for optimal adjustments of the air-to-fuel ratio, enabling the combustion turbine to operate at its most cost-effective efficient point while reducing emissions. In the power industry, where emissions are closely regulated, operating cleaner and more efficiently also means a tremendous savings by avoiding potential costly fines.

Stoichiometric combustion is the ideal combustion condition where fuel is burned completely. Complete combustion is a process burning all the carbon (C) to (CO2), all the hydrogen (H) to (H2O) and allGas Sample Probe the sulfur (S) to (SO2). Almost all modern turbines require stoichiometric combustion. Any unburned Components remaining in the exhaust gas, such as C, H2, and CO, means the combustion process is incomplete and not stoichiometric.

Not only does the GC provide the individual component concentrations, a process gas chromatograph also provides fuel gas heating values, allowing optimal adjustment of the air-to-fuel ratio. When the chemical mixing proportion is correct (stoichiometric), all fuel and air will be consumed during the combustion process, burning cleanly and enabling the turbine to operate at its most efficient, cost effective point.