Dipl. Ing. Matthias Mayerhofer Technische Universität München ...

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44 Experiments 6 Experiments 6.1 Experimental Facility Gasifier: The experimental set-up at the Technische Universität München, as shown in Figure 18 is consisted of the following parts: (i) a gasifier vessel with internal diameter 154mm, length 1500 mm, (ii) a biomass feeder which feeds into the bottom of the gasifier wood pellets, (iii) a steam providing section with a steam flow, (iv) a gas measurement and sampling section, (v) temperature control section. The reactor which produced the gas, with which the catalysts were tested, is an allothermal fluidized bed gasifier constructed out of high temperature resistance steel (German material number 1.4841). It is heated up electrically to 800°C and metal heat pipes transport the heat inside the bed. Steam was used as a fluidizing medium. The steam of 150 °C was produced by a steam generator and was supplied to the gasifier at the bottom. The steam to biomass ratio (S/B) is 1.0 . The mass flow was measured by steam mass flow meter. The produced gas flow exits the reactor at the top of the gasifier. Then, it passes through a cyclone (~400°C) and then through a ceramic candle filter (~340°C) which are placed right after the gasifier to achieve particulates removal. The particulates free gas is driven to the catalyst test rig via transfer lines which are heated up to ~320°C to avoid tar condensation. The volume flow is being calculated by an orifice plate. The device, Figure 17, is placed right after the catalyst test rig and it uses the Bernoulli principle to describe the relation between the pressure and the velocity of the gas. The space velocity is calculated as Figure 17 : Orifice Plate http://en.wikipedia.org/wiki/Orifice_plate (wikipedia 2012) Feed Materials: As bed material ~15-17 kg of olivine was used and the height of the bed was ~ 700 mm. As biomass feedstock wood pellets were used which are commercially available under the trading name Agrol and are a blend of ~80% spruce and ~20% pine. The biomass throughput for the reactor was experimentally determined. The proximate and ultimate analysis (Vario Macro CHNS analyzer) of the pellets can be seen in Table 3. The volatile content is relatively high and the pellets have low moisture and ash content. .
Experiments 45 Table 3: Biomass feedstock elemental and proximate analysis in [wt %] C waf H waf N waf S waf O waf 49,9 6,8 0,1 0,1 43,2 Water Ash db Volatile db Fix C db 4,8 0,1 85,6 14,3 Biomass 2 kg/h Fluidised Bed 800°C Steam 2kg/h Heatpipes Cyclone Particle Filter GC SPA Catalytic Test Rig Product Gas GC SPA Figure 18: Overview of the facility 1 2 3 Thermocouples Combustion chamber Catalytic Test Rig: The catalyst reactor can be seen in Figure 19. The catalyst is placed in a tube (inner diameter 2-5 cm) which contains a grid at the bottom and the top to ensure that the fine particles of the catalyst are not swept away by the gas during the experiment. The dimensions of the test rig can be seen in detail in Table 4. Table 4: Dimensional details of the bed Height of the test rig Height of the tube Height of the bed 400 mm 220 mm 75 mm The heating inside the catalyst bed is monitored by three thermocouples placed at the bottom, the middle and the top of the bed. Hence, an overview of the temperatures inside the bed is achieved. The measurements indicated that the temperature was uniform inside the bed during the whole experiment.
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Betreuer der Arbeit: Dipl. Ing. Mat
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Acknowledgements This work was acco
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II Content Content Acknowledgements
Page 10 and 11: IV List of Figures List of Figures
Page 12 and 13: VI List of Abbreviations List of Ab
Page 14 and 15: VIII Notation Notation ΔH [Kj/mol]
Page 17 and 18: Introduction 1 1 Introduction The d
Page 19 and 20: Introduction 3 1.2 Tasks The presen
Page 21 and 22: Biomass Gasification 5 2 Biomass Ga
Page 23 and 24: Biomass Gasification 7 Spouted Bed
Page 25 and 26: Biomass Gasification 9 2.2 Gas Clea
Page 27 and 28: Biomass Gasification 11 types of ca
Page 29 and 30: Biomass Gasification 13 Mechanical
Page 31 and 32: Biomass Gasification 15 Partial oxi
Page 33 and 34: Biomass Gasification 17 The followi
Page 35 and 36: Biomass Gasification 19 Groups of C
Page 37 and 38: Nickel Based Catalysts 21 even show
Page 39 and 40: Nickel Based Catalysts 23 The conte
Page 41 and 42: Nickel Based Catalysts 25 ing press
Page 43 and 44: Nickel Based Catalysts 27 3.4 Proce
Page 45 and 46: Iron Based Catalysts 29 4 Iron Base
Page 47 and 48: Iron Based Catalysts 31 Measurement
Page 49 and 50: Iron Based Catalysts 33 The percent
Page 51 and 52: Iron Based Catalysts 35 4.6 Catalys
Page 53 and 54: Iron Based Catalysts 37 Reduction i
Page 55 and 56: Iron Based Catalysts 39 and MgO (Di
Page 57 and 58: Precious Metal Catalysts 41 5 Preci
Page 59: Precious Metal Catalysts 43 Bimetal
Page 63 and 64: Experiments 47 6.3.1Experimental Pr
Page 65 and 66: Experiments 49 6.3.2 Tar Sampling M
Page 67 and 68: Results and Discussion 51 7 Results
Page 69 and 70: Results and Discussion 53 7.2 Sampl
Page 71 and 72: Results and Discussion 55 Wet Gas C
Page 73 and 74: Results and Discussion 57 er, the v
Page 75 and 76: Results and Discussion 59 7.3.1. Ef
Page 77 and 78: Results and Discussion 61 The conve
Page 79 and 80: Results and Discussion 63 7.3.3 App
Page 81 and 82: Results and Discussion 65 7.4 Blank
Page 83 and 84: Summary/Outlook 67 The aim is to pr
Page 85 and 86: References 69 (Aznar,1993) Aznar, M
Page 87 and 88: References 71 (Hepola,1997b) Hepola
Page 89 and 90: References 73 (Sarvaramini,2012) Sa
Page 91 and 92: 75 Appendix Appendix A: Iron based
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Dipl. Ing. Matthias Mayerhofer Technische Universität München ...

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