Components of LNG liquefied natural gas:
The main component of LNG is methane, with the chemical name CH4, and a small amount of other components such as ethane C2H6, propane C3H8, and nitrogen N2. The liquid density is 0.430T/m3, the gas density is 0.688kg/Nm3, the gas calorific value is 9100Kcal/m3, and the liquid calorific value is 12000Kcal/kg. The Huabai Index (W) is 44.94MJ/Nm3. Combustion potential (CP) 45.18. The determination of the composition and calorific value of LNG is an important part of LNG production and distribution, because the buying and selling price of natural gas is directly related to its content. Adding liquid nitrogen to LNG not only affects the calorific value effect of the entire LNG, but also the density of liquid nitrogen is different from that of LNG. In the static state of the refueling station, stratification will occur, which has a significant impact on LNG powered vehicles.

Main technical indicators of liquefied natural gas analyzer:

The machine adopts a modular design, with a compact and reasonable body structure, multiple expansion functions, and accurate and fast analysis.
Equipped with a 5.7 LCD screen, the display content is rich and intuitive, making human-machine dialogue easier. Chinese English switching mode to meet different customer needs.
Adopting advanced microcomputer control system, all control and analysis tasks can be completed on PC, and built-in AD conversion circuit can also be optionally selected to directly output chromatographic signals digitally.
● It has 6 control modules, and the temperature control of each module can be set from room temperature to 400 ℃, with an increment of 1 ℃ and an accuracy of ± 0.1 ℃
Equipped with over temperature protection, if each temperature control system exceeds the set temperature protection value, it will automatically power off to avoid danger caused by temperature loss of control.
Intelligent flexible rear door design, with more precise temperature control accuracy.
● Equipped with 9-order programmed temperature rise, meeting the requirements for complex sample analysis.
● Lift rate: 0.1-40 ℃/min
● Multiple injection methods to choose from: column head injection, split/non split injection, packed column injection, gas valve injection, headspace injection, thermal analysis injection, purge and flash injection, etc
A 20L large column temperature chamber lays the foundation for multidimensional chromatographic analysis.
The external control event module can be equipped with a multi valve and multi column switching system, which can complete the full analysis of complex gas components with one injection. Realize automated operation of instruments.
The maximum number of detectors that can be installed is 3 (FID, TCD, ECD, FPD, NPD), and a methane converter can be installed.
Start injection: Choose between manual and automatic modes. When selecting automatic injection, the program temperature rise function can be activated simultaneously.
Column box size: 28mm × 28mm × 27mm (length * depth * height)
Instrument size: 635mm × 580mm × 50mm (length * depth * height)
Technical parameters of detector:
Hydrogen flame ionization detector (FID)
Detection limit: Mt ≤ 3 × 10-12g/s (n-hexadecane-isooctane solution);
Baseline noise: ≤ 0.02mv
Baseline drift: ≤ 0.15mv/h
● Linear range: ≥ 107
Maximum operating temperature: ≤ 400 ℃
Thermal conductivity detector (TCD)
Sensitivity: S ≥ 3500mV • ml/mg
Baseline noise: ≤ 0.02mv
Baseline drift: ≤ 0.15mv/h
● Linear range: ≥ 105
Maximum operating temperature: ≤ 400 ℃

Electron Capture Detector (ECD)
Detection limit: ≤ 1 × 10-14g/s (octachlorocyclohexane isooctane solution)
Baseline noise: ≤ 0.03mV
Baseline drift: ≤ 0.2mV/h
● Linear range: ≥ 104
● Radioactive source: 63Ni
Flame photometric detector (FPD)
Detection limit: (S) ≤ 5 × 10-13g/s; (P) ≤ 1 × 10-13g/s (methyl parathion anhydrous ethanol solution)
Baseline noise: ≤ 0.03mV
Baseline drift: ≤ 0.2mV/h
● Linear range: ≥ 103 (S) 102 (P)
Nitrogen phosphorus detector (NPD)
Detection limit: (N) ≤ 1 × 10-13g/s; (P) ≤ 5 × 10-14g/s (azobenzene malathion isooctane solution)
Baseline noise: ≤ 0.03mV
Baseline drift: ≤ 0.2mV/h
● Linear range: ≥ 102 (N) 103 (P)

Shanghai Xuansheng can provide ideal solutions for laboratory, online, and on-site applications

Analysis plan one: 2-channel system analysis of C1 to C9 hydrocarbons, carbon dioxide, and air
Analysis plan two: 3-channel blowback technology analysis of C1 to 12 hydrocarbons, carbon dioxide, and air
Analysis plan three: 2-channel blowback technology analysis of C1 to C9 hydrocarbons, carbon dioxide, air, and hydrogen sulfide
Analysis plan four: 3-channel blowback technology analysis of C1 to C9 hydrocarbons, carbon dioxide, air, hydrogen sulfide, and N2