Details of SP-3420A Refinery Gas Analysis Special Gas Chromatography Instrument:
This instrument is equipped with 4 valves and 5 columns, and a dual thermal conductivity detector for gas analysis in refineries or natural gas composition analysis. One injection can complete the complete analysis of refinery gas composition. The components include H2, O2, N2, CO, CO2, H2S, C1-C2, C6+(hydrocarbons above C6). The detection range is 0.01% -100% (volume fraction).

Channel I contains a gas injection ten way valve with blowback function, while channel II contains a gas injection ten way valve and two isolation six way valves, among which the ten way valves have sequence reversal and blowback functions.

This analysis system can complete the analysis of various components of refinery gas in one injection. Data processing and quantification are completed by a dedicated refinery gas workstation, and parameters such as calorific value (molar calorific value, mass calorific value, volume calorific value, and Wopo index) of each component are obtained. Valve switching is completed by the chromatograph host.

Analysis chromatogram of refinery gas with four valves and five columns

Process diagram of refinery gas four valve five column system

Process diagram of refinery gas analysis system
working principle:
The measurement of this system is carried out on two channels. After the sample is injected through the valve, valve 4 introduces the sample into channel I. After H2 flows out, valve 4 returns to blow back the remaining components and empty them. At the same time, the sample enters the separation system on channel II, and after separation by pre column 1, the column flow direction is changed. C5H10 and C6+hydrocarbons are blown back to the TCD detector, and then valves 2 and 3 collect CO2, ethylene, ethane, N2, O2, CH4, and CO respectively. Afterwards, acetylene, H2S, and C3-C5 hydrocarbons flow through the TCD detector for detection. When n-pentane flows out, they are sequentially returned to valves 2 and 3 to allow CO2, ethylene, ethane, N2, O2, CH4, and CO to flow into the TCD detector.

characteristic:
1. The instrument system is a multidimensional chromatographic analysis method using a fully packed column and full TCD, with high column load and high degree of automation.
2. One injection can obtain the content of various components in the refinery gas, and the four C4 olefin isomers can be well separated.
3. Within the linear range, it is not affected by the injection volume and does not have strict requirements for injection.
4. The two channels are independent of each other. If there is no need to detect H2 content, only channel II can be used.
5. N2 and O2 are detected separately, and C5H10 and C6+hydrocarbons are used as a blowback peak for detection
6. This analysis system is for the full component analysis of refinery gas, with simple quantification and convenient use of internal normalization method with correction factors.
7. The system process is suitable for all applications that require the separation of N2, O2, CO2, CH4, CO, and C2 to C5 hydrocarbons.
8. Suitable for unmanned automated analysis, data can be connected to DCS system to improve production efficiency