Carbon dioxide removal in indirect gasification - SGC

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SGC Rapport 2013:277 case is the case that has the largest differences compared to traditional biogas upgrading as there is low methane content and high content of hydrogen and carbon monoxide in the gas, table 7. Table 7. The 100 MW gas mixtures and flow rate on a dry-gas basis. 100 MWth 100 MWth Pre-methanation Post-methanation Component (Vol-%) (Vol-%) CO2 35.4 47.6 CH4 24.5 48.8 CO 9.5 0.1*10 -3 H2 29.6 2.0 C2Hx C6H6 6.4*10 -4 2.4*10 -6 7.9*10 -4 0 N2 1.1 1.6 O2 0 0 Gas flow (Nm 3 /h) 20 400 15 700 As can be seen in the table, there is about 35% CO2 in the gas mixture before methanation and 48% after methanation. The gas mixture before methanation contains 30% hydrogen and 10% carbon monoxide as well as trace amounts of ethylene and benzene. After the methanation, the CO is reduced to trace amounts while there is still 2% hydrogen in the mixture as well as trace amounts of C2Hx which is about 10% of both ethane and acethylene while 80% is ethylene. For the purpose of these calculations all C2Hx has been considered as ethane or ethylene. The cases have been constructed using the MILENA and OLGA gasification and gas purification as already stated. The methanation has been modeled based on the TREMP set-up and using information in the open literature with respect to operating conditions energy is exported [2]. In the current set-up heat is also used for biomass drying from 50% to 25% moisture content using 4.5 MJ/kg of water [88]. The cases simulated are quite close to the process lay-out in Figure 11 but for clarity figure 23a and 23b contains the two alternatives considered here. 48 Svenskt Gastekniskt Center AB, Malmö – www.sgc.se
SGC Rapport 2013:277 Figure 23a. MILENA with OLGA and TREMP using pre-methanation CO2 separation. Figure 23b. MILENA with OLGA and TREMP using post-methanation CO2 separation. 6.3 Results As described above, three different process configurations were considered. These are characterized by the thermal input (10 MWth and 100 MWth) and using premethanation and post-methanation separation in the 100 MWth case. The three different gas compositions from these cases were studied with the two downselected CO2 separation methods. These are summarized in Table 8. Svenskt Gastekniskt Center AB, Malmö – www.sgc.se 49
Page 1 and 2: SGC Rapport 2013:277 Carbon dioxide
Page 3 and 4: CARBON DIOXIDE REMOVAL IN INDIRECT
Page 5 and 6: SGC Rapport 2013:277 Svenskt Gastek
Page 7 and 8: Authors’ foreword SGC Rapport 201
Page 9 and 10: Sammanfattning SGC Rapport 2013:277
Page 11 and 12: SGC Rapport 2013:277 Figur S.2b San
Page 13 and 14: SGC Rapport 2013:277 4.2.3 Chilled
Page 15 and 16: SGC Rapport 2013:277 2 Production o
Page 17 and 18: SGC Rapport 2013:277 Figure 1. Hald
Page 19 and 20: SGC Rapport 2013:277 Table 1. Summa
Page 21 and 22: SGC Rapport 2013:277 Figure 3. Sche
Page 23 and 24: SGC Rapport 2013:277 This category
Page 25 and 26: SGC Rapport 2013:277 3.1.3 Entraine
Page 27 and 28: SGC Rapport 2013:277 3.2 Gas impuri
Page 29 and 30: SGC Rapport 2013:277 of tar removal
Page 31 and 32: SGC Rapport 2013:277 Figure 11. Pos
Page 33 and 34: SGC Rapport 2013:277 4 CO2-capture
Page 35 and 36: SGC Rapport 2013:277 saturated with
Page 37 and 38: SGC Rapport 2013:277 The use of a p
Page 39 and 40: SGC Rapport 2013:277 brane systems
Page 41 and 42: SGC Rapport 2013:277 5 Models In th
Page 43 and 44: SGC Rapport 2013:277 then saturated
Page 45 and 46: SGC Rapport 2013:277 temperature pr
Page 47 and 48: SGC Rapport 2013:277 The amount of
Page 49: SGC Rapport 2013:277 Table 6. Gas c
Page 53 and 54: SGC Rapport 2013:277 Table 10. Gas
Page 55 and 56: SGC Rapport 2013:277 Table 12. Gas
Page 57 and 58: SGC Rapport 2013:277 Table 14b. Gas
Page 59 and 60: SGC Rapport 2013:277 overall biomas
Page 61 and 62: Amount absorbed of ingoing moleflow
Page 63 and 64: SGC Rapport 2013:277 of LPG additio
Page 65 and 66: SGC Rapport 2013:277 8 Conclusions
Page 67 and 68: SGC Rapport 2013:277 10 Literature
Page 69 and 70: SGC Rapport 2013:277 40. Mumford, K
Page 71 and 72: SGC Rapport 2013:277 73. Klingspor,

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