Natural Gas Analyzer by Multidimensional Gas Chromatography Brochure

Natural Gas Analyzer by Multidimensional Gas Chromatography Zack Ji, GS-Tek. NaiZhong Zou, Beijing Chromtech Institute Introduction • Natural Gas Analyzer (NGA) are developed based on Agilent-6890/6820 GC. This system employs multidimensional GC technique to analyze components in the sample such as O2, N2, CO, CO2, H2S, C1-C12 Hydrocarbons. The system is equipped with two valves, three packed columns and one capillary column. • The analyzer produces good repeatability and fast analysis. • The physical properties of natural gas are calculated by a software. System Configuration 1?Agilent 6890 N (or 6820) GC Mainframe 2? 2070AA Multi-Function ChemStation 3? FID with EPC 4?TCD with EPC 5?Purged-packed Inlet with EPC 6?Split/Splitless Capillary Inlet with EPC 7?Two automated valve box 8? Capillary Column ( PONA column) 9?Packed column kit 10?System installation kit 11?Valve Options ( Refer to Valve Flow Diagram) Valve Flow Diagram Standard sample Chromatogram TCD split FID H2, B H2, A Capillary column Analytical column(2) Analytical column(1) Pre_column Loop,0.25cc OFF OFF C3H8:6.0 iC4:3.0 nC4:3.0 iC5:1.0 nC5:1.0 nC6:0.5 (Mol%) CH4:69.0 C2H6:9.0 CO2:1.0 O2:0.5 N2 :6.0 (Mol%) min1 2 3 4 5 6 7pA050100150200250300350 FID1 A, (NGA00045.D) C3H8 iC4H10 nC4H10 iC5H12 nC5H12 nC6H14 C7min1 2 3 4 5 6 725 uV050100150200250300350 TCD2 B, (NGA00045.D) CO2 C2H6 O2 N2 CH4Chromatogram: Sample Table1 Repeatability Mol% CH4 C2H6 C3H8 I-C4 N-C4 I-C5 N-C5 41 91.926 3.168 0.711 0.127 0.186 0.042 0.051 42 91.829 3.184 0.709 0.127 0.186 0.042 0.051 43 91.803 3.194 0.710 0.127 0.186 0.042 0.051 44 91.800 3.226 0.713 0.128 0.187 0.043 0.051 min2 4 6 8 10 12 14 16pA0100200300400500600700800900 FID1 A, (NGA00021.D) C3H8 iC4H10 nC4H10 iC5H12 nC5H12 22DMC4 2MC5 3MC5 nC6H14 nC7H16 nC8H18 nC9H20 nC10H22 nC11H24 nC12H26min2 4 6 8 10 12 14 1625 uV0100200300400500600700800900 TCD2 B, (NGA00021.D) CO2 C2H6 O2 N2 CH4Table2 Repeatability Physical Properties Compres-sibility Factor Superio calori Kj/M^3 Inferio Calori Kj/M^3 DensityKg/M^3 Relative Density Wobbe index Kj/M^3 41 0.99737 40220.5 36304.8 0.77711 0.60107 51878.3 42 0.99733 40428.4 36498.3 0.78093 0.60402 52018.9 43 0.99733 40399.9 36472.1 0.78073 0.60387 51988.9 44 0.99733 40425.7 36495.7 0.78078 0.60390 52020.5 Mol% 22DMC4 2-MC5 3-MC5 nC6 N2 CO2 AIR 41 0.003 0.012 0.005 0.016 3.678 0.035 0.057 42 0.003 0.012 0.005 0.016 3.639 0.033 0.062 43 0.003 0.012 0.005 0.015 3.664 0.035 0.112 44 0.003 0.012 0.005 0.015 3.636 0.030 0.066 - Summary ? Multidimensional GC is configured wiyj packed and capillary columns ? Only two valves are needed instead of the use of three valves ? Packed columns: high capacities for analyzing permanent gases component such as O2, N2, CO, CO2, H2S PONA column: high efficiency for analyzing C1-C12 Hydrocarbons or higher ? EPC: produces the good stability, repeatability and easier to operate ? Fast analysis (less 20 min to C12) ? The physical properties of natural gas are calculated by a software.