Application scope: natural gas, refinery gas, cracking gas
The cracking gas analysis gas chromatograph is equipped with 3 valves and 4 columns, a hydrogen flame ionization detector (FID), and a thermal conductivity detector for refinery gas analysis or natural gas analysis. This system uses dual channel analysis to divide a separation problem into two parts. AL2O3 PLOT capillary column/FID channel is used to analyze hydrocarbons of C1 to C8. H2, O2, N2, CO, CO2, CH4, and H2S are separated by PLOT Q column and molecular sieve column, respectively, and detected by TCD. One injection can complete the full analysis of refinery gas composition.
Brief flowchart of three valves and four columns (capillary column type)

Analysis chromatogram of cracked gas with three valves and four columns