Selection of Wash Systems for Sour Gas Removal
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1 Selection of Wash Systems for Sour Gas Removal 4 th International Freiberg Conference on IGCC & XtL Technologies 5 May 2010 B. Munder, S. Grob, P.M. Fritz With contribution of A. Brandl, U. Kerestecioglu, H. Meier, A. Prelipceanu, K. Stübner, B. Valentin, H. Weiß
2 Outline Overview of Absorptive Sour Gas Removal Processes Criteria for Choice of Absorptive Sour Gas Removal Processes Comparison of Amine Wash Processes and the Rectisol Process Qualitative comparison Case Studies: Sour gas removal for 1. Fuel gas production for IGCC from coal 2. Coal to Liquid (CtL) process 3. Biomass to Liquid (BtL) process Summary and Conclusion Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 2
3 Overview of Absorptive Sour Gas Removal Processes Chemical sour gas removal processes: Acid gases are chemically bound to the solvent. Amines: e.g. MEA, DEA, DIPA, MDEA, MDEA+additive (e.g. amdea process) Liquid oxidation process on iron basis for removal of H 2 S: e.g. SulFerox, LO-CAT Physical sour gas removal processes: Acid gases are dissolved in the solvent. Methanol (Rectisol process) Polyethylenglycol Ether (e.g. Selexol, Genosorb, Sepasolv processes) n-methyl-2-pyrrolidone (NMP; e.g. Purisol process) Physical-chemical sour gas removal processes: Methanol + Amine (e.g. Amisol process) Sulfolane + Amine (e.g. Sulfinol process) Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 3
4 Criteria for Choice of Absorptive Sour Gas Removal Processes Technical requirements Quality of feed gas to sour gas removal unit Quality of purified synthesis gas Quality of other product gases Operability Availability of solvent and of required utilities Environmental regulations Commercial decision criteria Investment costs, operational costs Net present value, internal rate of return Risk (Proven technology? Reference plants?) Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 4
5 Comparison of Amine Wash Processes and Rectisol Linde applies mainly two types of absorptive sour gas removal processes: Amine Wash Processes Chemical sour gas removal process Additives can be used to increase/decrease the CO 2 reaction rate in the solvent. CO 2 and H 2 S are washed out simultaneously. A selective, i.e. separate, removal of CO 2 and H 2 S is not possible. MDEA Molecule Rectisol Physical sour gas removal process The process was jointly developed by Linde and Lurgi. The Rectisol process uses methanol as wash solvent. A selective or nonselective removal of CO 2 and H 2 S can be realised. Methanol Molecule Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 5
6 Simplified PFD of a 1-stage Amine Wash Process Absorption Section Regeneration Section Purif. Gas Flash Gas Sour Gas (CO 2, H 2 S) BFW C.W. WW Feed Gas Antifoam Dosing Unit steam C.W. Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 6
7 Simplified PFD of a 2-stage Amine Wash Process Absorption Section Regeneration Section Purif. Gas Flash Gas Sour Gas (CO 2, H 2 S) BFW WW Feed Gas Antifoam Dosing Unit Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 7
8 Linde s Amine Wash Units in Hungary and China 1-stage Amine Wash Unit Kazincbarcika, Hungary 2-stage Amine Wash Unit Daqing, China Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 8
9 Simplified PFD of a selective Rectisol Process - Selective removal of H 2 S/COS & CO 2, high CO 2 capture Absorption Section Cold Regeneration CO 2 Production Hot Regen. H 2 S Fraction c.w. Feed Gas Methanol Injection Refr. steam steam LP-CO 2 MP-CO 2 Purif. Gas Containing CO 2 Containing Sulphur Waste Water Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 9
10 Linde s Rectisol Wash Unit in China Selective Rectisol Wash Unit, Jilin, China Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 10
11 Typical Operating Conditions of Amine Wash Processes and Rectisol Absorber Temperature Pressure Feed Gas CO 2 Content Amine Wash +30 C to +70 C 10 bar(a) - 80 bar(a) > 2 mol% Rectisol -20 C to -60 C 30 bar(a) - 80 bar(a) > 10 mol% Max. Flow depending on feasible column diameter Purified Gas CO 2 Content H 2 S + COS Sulphur free CO 2 Product Sulphur Product 15 ppmv - 5 mol% 5 ppmv not feasible not feasible 5 ppmv - 5 mol% *) 0.1 ppmv 98.5 mol% CO 2 < 5 ppmv H 2 S + COS mol% H 2 S *) Process configuration with less CO 2 removal is feasible Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 11
12 Qualitative Comparison of Amine Wash Processes and Rectisol Rectisol + Purified gas virtually free of sulphur components. + CO 2 streams virtually free of sulphur components. + Sour gas stream with H 2 S content > 25 mol%. stream can be further processed in a Claus plant. + Handling of trace components is well understood (e.g. NH3, COS, HCN, metal carbonyls, aromatic hydrocarbons). - Refrigeration unit is required. Amine Wash - No separate production of CO 2 and sulphur fractions possible. Additional process for separation of H 2 S and CO 2 needed, if to be further processed in a Claus plant. - Limited tolerance for trace contaminants. Upstream removal required, e.g. in guard beds. + No refrigeration unit required. Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 12
13 Required equipment for Amine Wash units and Rectisol units Columns Heat Exchangers Vessels Pumps Filters Amine Wash Rectisol Total C ost (CAPEX & OPEX) Chemical Wash Solvent Physical Wash Solvent Choice on the optimum process depends predominantly on: Partial Pressure of CO 2 CO 2 content of feed gas operating pressure required quality of products feed gas flow rate trace components in the synthesis gas produced in the gasification For each application the optimum process has to be chosen individually. Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 13
14 Case Studies: Sour Gas Removal for 1. Fuel Gas Production for IGCC from Coal (1) Process Specifications: Syngas to sour gas removal: CO 2 content: H 2 S content: CO 2 recovery rate: Sulphur recovery: 500,000 Nm³/h at 35 bar(a) 40 mol% 2 mol% 0.2 mol% 5 ppmv > 90% Claus (Rectisol) / liquid oxidation (Amine W.) Syngas from Sour CO shift coal conversion gasification CO 2 product ready for sequestration Sour gas removal Sulphur recovery Power Gas turbine Steam/Power Waste heat recovery Flue gas (low CO 2 content) Sulphur product N 2 Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 14
15 Case Studies: Sour Gas Removal for 1. Fuel Gas Production for IGCC from Coal (2) Optimum configuration Amine Wash Rectisol 2-stage process selective process Number of trains (transport limitation) multiple trains (6) single train OPEX: Steam Electric Energy 300 % 100 % CAPEX 95 % 100 % 100 % *) 100 % *) *) including refrigeration unit Conclusion: Rectisol preferred choice: clearly lower OPEX, approx. equal CAPEX lower number of trains easier operability virtually sulphur free CO 2 product (suitable for CO 2 sequestration) H 2 S enriched sour gas fraction (suitable for Claus Plant) better handling of trace components (e.g. COS, HCN, metal carbonyles) Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 15
16 Case Studies: Sour Gas Removal for 2. Coal to Liquid (CtL) Process (1) Syngas to sour gas removal Purified Syngas shifted partially shifted CO 2 content: H 2 S content: 3,000,000 Nm³/h 1,500,000 Nm³/h 32 bar(a) 32 bar(a) 40 mol% 30 mol% 0.3 mol% 0.3 mol% 15 ppmv 0.1 ppmv (Rectisol ) 5 ppmv (Amine W.) Syngas from Coal Gasification Sour CO shift conversion/ Heat recovery Sour gas removal I Regeneration Feed gas for FT synthesis H 2 /CO 2.0 mol/mol MP+LP CO 2 (to sequestration) (CO 2 98 mol%) H 2 S fraction Sour gas removal II for Claus Plant (Rectisol ) for Liquid Ox. (Amine W.) Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 16
17 Simplified PFD of a selective Rectisol Process - Selective removal of H 2 S/COS & CO 2, high CO 2 capture, shifted/partially shifted configuration Absorption Section Cold Regeneration CO 2 Production Hot Regen. H 2 S Fraction Methanol Injection Refr. c.w. Shifted Feed Gas steam steam LP-CO 2 MP-CO 2 Purif. shifted Gas Waste Water Methanol Part. shifted Injection Feed Gas Refr. Purif. part. shifted Gas Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 17
18 Case Studies: Sour Gas Removal for 2. Coal to Liquid (CtL) Process (2) Amine Wash Rectisol Optimum configuration Number of trains (hydraulic limitation of column diameters) 2-stage process shifted feed: 12 trains partially shifted: 10 trains shifted/partially shifted config. 4 trains OPEX: Steam Electric Energy 200 % 60 % CAPEX 105 % 100 % 100 % *) 100 % *) *) including refrigeration unit Conclusion: similar OPEX/CAPEX Rectisol preferred choice: unrealistic number of trains for Amine Wash poor operability virtually sulphur free purified syngas for Fischer Tropsch synthesis H 2 S enriched sour gas fraction (suitable for Claus Plant) Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 18
19 Case Studies: Sour Gas Removal for 3. Biomass to Liquid (BtL) Process (1) Process Specifications: Synthesis gas to sour gas removal: CO 2 content: H 2 S content: Sulphur removal: 250,000 Nm³/h at 33 bar(a) 35 mol% 2 mol% 40 ppmv 200 ppmv minimum Liquid oxidation process on basis of iron Syngas from Biomass Gasification Sulphur removal and recovery Sweet CO Shift conversion CO 2 removal Feed gas for FT synthesis H 2 /CO 2.0 mol/mol Heat recovery PSA H 2 Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 19
20 Simplified PFD of a nonselective Rectisol Process Absorption Section Regeneration Section Sour Gas (CO 2 ) Methanol Injection Refr. c.w. Feed Gas steam steam Purif. Gas Waste Water Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 20
21 Case Studies 3. Biomass to Liquid (BtL) Process (2) Optimum config. Amine Wash Rectisol 2-stage process nonselective process Number of trains single train single train (2 parallel absorbers, common regen.) OPEX Steam Electric Energy CAPEX Conclusion: higher for Amine Wash compared to Rectisol lower for Amine Wash compared to Rectisol Overall OPEX similar lower for Amine Wash compared to Rectisol CAPEX/OPEX Amine Wash In view of the inhomogeneous nature of biomass: Amine Wash would require appropriate upstream guard bedding, while Rectisol provides excellent handling of trace components Higher stability of methanol compared to amines Rectisol recommended Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 21
22 4. Summary and Conclusion Arguments for choosing an Amine WashUnit a Rectisol unit low partial pressure of CO 2 low sulphur content no trace components moderate or low flow rate of feed gas moderate or low cost of LP steam high partial pressure of CO 2 high sulphur content and sulphur free products required trace components (e.g. HCN, metal carbonyls, aromatic components) high flow rate of feed gas high cost of LP steam For each application the sour gas removal process has to be chosen and optimized individually. Linde AG Engineering Division 4th International Freiberg Conference on IGCC & XtL Technologies Selection of Wash Systems for Sour Gas Removal 22
23 Thank you for your attention.
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