Gasification of Biomass with In-Situ CO 2 Capture and Separation in a 200 kw th Pilot Plant
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1 Institut für Feuerungs- und Kraftwerkstechnik Prof. Dr. techn. G. Scheffknecht Gasification of Biomass with In-Situ CO 2 Capture and Separation in a 200 kw th Pilot Plant N. Armbrust, D. Schweitzer, A. Gredinger, M. Beirow, T. Beisheim N. Poboss, C. Hawthorne, H. Dieter, G. Scheffknecht Gasification Technologies 2014, Washington D.C., October 26-29, 2014
2 Fluidized bed gasification infrastructure 20 kw th electrically heated DFB System 5 kw th electrically heated FB batch System Fluidized Bed Gasification Air gasification Steam gasification Steam/Oxygen gasification Sorption enhanced reforming (SER) Two stage SER gasification Fuels Biomass Waste Lignite Measurement techniques Tar: wet chemical acc. tar protocol Non-condensable gases: online Non-condensable HC: GC H 2 S, HCl: wet chemical Online Tar analysis 200 kw th DFB Pilot Facility 2
3 The Sorption Enhanced Reforming (SER) process Solid flow CaO Enthalpy flow H 2 rich product gas CO 2 rich flue gas Biomass Waste Lignite Steam Gasifier Regenerator CO 2 recycle O 2 Water Gas Shift CO + H 2 O CO 2 + H 2 Insitu CO 2 - capture CO 2 + CaO CaCO 3 Gasification temperature 650 C C Solid flow CaCO 3 Char Regeneration CaCO 3 CO 2 + CaO Char combustion C + O 2 CO 2 Regenerator temperature 850 C 900 C
4 Equilibrium CO 2 Concentration [vol.-%] Equilibrium Reaktion: CaO + CO 2 CaCO Oxyfuel Flue Gas CO 2 Concentration 10 CO 2 Capture (Carbonation) CaO + CO 2 CaCO 3 Outlet CO 2 Conc. for 90% Capture Calcination CaCO 3 CaO + CO Temperature [ C] MaxT Carbonator Min T Regenerator 4
5 200 kw th SER DFB Gasification Pilot Plant Gasifier Regenerator CO 2 -rich Gas Gasifier H 2 rich Gas Int. Diameter m 0,33 Height m 6 CaO Gas velocity m/s 0,4-0,6 Loop seal Regenerator Int. Diameter m 0,21 Height m 10 Gas velocity m/s 4,5-6,5 200 kw th Dual Fluidized Bed Gasifier Tertiary O 2 /CO 2 Secondary O 2 /CO 2 O 2 /CO 2 Fuel Steam CaCO 3 & Char
6 200 kw th SER DFB Gasification Pilot Plant Feedstock &limestone dosing unit Cyclone Quench Product gas flare Induced draft fan Gasifier Baghouse filter Steam generator Regenerator Preheater Purge 6
7 LHV-Syngas [MJ/m³ STP ] Tar concentration [g/m³] Gas concentration [vol.-% db ] H 2 concentration [vol.-% db ] Temperature [ C] Experimental operation: Gas composition Gasifier Regenerator Stable conditions above 17h continously gasification Gasifier Product gas composition is sensitive to temperature H 2 change C x H y CO 2 CH 4 CO Product gas lower heating value varies with the gas composition tar LHV Time [h] 7
8 Gas concentration [vol.-% db ] LHV-Syngas [MJ/m³ STP ] Temperature variation: Gas composition Gasifier Increasing gasification temperature results in Decreasing H 2, CH 4, C x H y concentrations Increasing CO 2 and CO LHV-Syngas concentrations due to the CO 2 /CaO equilibrium Decreasing LHV The SER operation window takes place between 600 C to Gasification temperature [ C] 700 C resulting in the maximum H 2 8
9 Gas Yield [m³ STP /kg Fuel,waf ] Cold Gas Efficiency [%] Temperature variation: Gas Yield and CGE Cold Gas Efficiency Increasing gasification temperature results in Increasing Gas Yield Increasing Cold Gas Efficiency Gas Yield Gasification temperature [ C] 9
10 Syngas CO 2 -rich CaO Increase of conversion: two-stage gasification product gas H 2 enriched WGSR / reformer 600 C-700 C gasifier 800 C-850 C flue gas CO 2 -rich regenerator 900 C-950 C Oair 2 /CO 2 biomass (Fuel) Advantages of the process: high biomass conversion in the gasifier low tar concentration high hydrogen yield and concentration (> 80%) high flexibility of the product gas composition steam Steam biomass Fuel CO 2 - capture CO 2 + CaO CaCO 3 water-gas shift CO + H 2 O CO 2 + H 2 10
11 Oxy-fuel regenerator performace Successful oxy-fuel regeneration with flue gas recycle Full calcination of sorbent Calciner CO 2 outlet concentrations above 95 vol.-%,dry (without purge gas) vol.-%,dry vol.-%,dry O 2 at outlet in vol.-%,dry CO 2 at outlet in vol.-%,dry Excess O 2 outlet concentrations below 3 vol.-%,dry Inlet O 2 concentrations above 50 vol.-%,dry without temperature peaks in the riser C upper riser temperature in C :00 00:30 01:00 time 11
12 Cumulative particle size, % Long-term experiment: Grain size distribution of the bed material Cumulative particle size of raw limestone and bed material after many hours of operation dp 50 Raw Limestone Bed Material µm 460 µm Particle Size [µm] At steady-state conditions, the median particle size decreased about 100µm from its raw limestone value of around 450µm to 350µm. The maximum measured attrition rate is approximately 3 wt.-% bed loss / hour 12
13 Application: Heat, Power, Fuels, Chemicals, H 2, Cement Heat SER H 2 -rich Fuel Cells Gas engine Power Fuel Gasifier Gas Gas Conditioning Hydrogen Limestone CaO CaCO 3 Char CO 2 -rich Synthesis Fuels Chemicals (CaCO 3 ) Regenerator Gas Gas Conditioning Storage CaO (+CaSO 4 ) Cement production Purge
14 R&D SER Process Roadmap DFB-Cold Model and Process Simulation: Fundamental CO 2 capture research Semi batch experiments - Electr. heated facility - SER-basic research P Zyklone Kerzenfilter Fackel Process Characterisation - Electr. heated 10 kw th facility - Investigation of the effect of different process parameter Process Demonstration: Realistic Process Conditions No external heating T Kont. Gasanalyse: P T T O2, CO2, CO, CH4, H2, CxHy, N2 T Sekundärluft T Dosiereinheit P T Waage P P T Förderluft Wirbelboden Auslass für Bettmaterial T T P Rezirkulationsrohr Fluidisierungsluft Rezirkulationsrohr Elektr. Vorwärmer T Primärluft Dampferzeuger Labscale Process Simulation 20 kw th DFB Facility 200 kw th - Pilot Plant Process Demonstration Demo Plant Commerical Plant Process Idea Development Staged gasification 14
15 Gasification temperature in C FID Online Tar Analyzer Developed by IFK and industry partner Ratfisch Analysensysteme GmbH Commercially available 2015 Robust system for plant environment Gasifier equipment monitoring possible Influence of gasification conditions on tar concentrations directly visible Semi-continuous measurements (60 second steps) Simplified detection of optimal gasifier / gas cleaning equipment operation point possible Tar concentration as organic bound carbon in mg/m³ stp Change in gasification temperature tar concentration as organic bound carbon 580 gasification temperature :00 0:14 0:28 0:43 0:57 1:12 1:26 measurement time in minutes 15
16 Conclusion SER is a flexible process for different applications Process demonstrated at a 200 kw th DFB pilot facility over multiple days In Situ CO 2 capture enables decarbonisation of gasification High H 2 concentrations of up to 75 vol.-% Product gas lower heating values up to 15 MJ/m 3 STP Low tar formation due to catalytic effect of CaO CaO bed material increases ash melting points Sulfur capture by CaO enables low sulfur concentration in CO 2 and product gas Online tar analyzer available
17 Thank you for your attention The authors gratefully acknowledge the financial support from the funding organizations: Design, construction, and operation of the pilot plant was conducted as part of a project funded jointly by Alstom Power and EnBW Kraftwerke AG together with the German state of Baden-Württemberg. Contact welcome: Heiko Dieter Institute of Combustion and Power Plant Technology University of Stuttgart heiko.dieter@ifk.uni-stuttgart.de 17
18 Experimental Temperature S/C-Ratio WHSV [ C] [mol H2O /mol C ] [kg Fuel h -1 /kg CaO ] Long-term experiment constant approx. 650 Temperature variation varied S/C-Variation * constant approx. 675 constant approx. 2 low high constant approx. 0,5 WHSV-Variation constant approx. 2 low high Experiments were conducted with wood wood pellets European standard for quality (EN ). 18
19 Comparison: 20 kw th and 200kW th DFB Facility 20 kw th DFB 200 kw th DFB H2 Vol.-% 73,1 72,3 CO2 Vol.-% 5,5 5,1 CO Vol.-% 6,8 9,9 CH4 Vol.-% 11,1 11,2 C x H y Vol.-% 3,5 1,9 LHV [MJ/m³ STP ] 14,7 14,1 CGE [%] Temp (Gasif.) [ C] Temp (Reg.) [ C] Good agreement between the gas composition and calorific value of the product gas for both facilities A higher Cold Gas Efficiency (CGE) can be observed in the 200 kw DFB, due to the higher gas yield. 19
20 Long-term experiment Goal of the long-term experiment Collect basic gasification datas under SER conditions Gas composition Gas yield Tar yield Sorbens deactivation Comparison with previous experiments conducted in a lab scale Investigation of the hydrodynamic behaviour of the test facility Operate the circulation rate in a robust manner Control the gasification temperature Investigate the attrition behaviour of the bed material Identification of the makeup and purge rate of the bedmaterial 20
21 Temperature variation Goal of the temperature variation experiment Identification of the optimum gasification temperature for: Maximum product gas yield and hydrogen concentration Optimum gas composition for ongoing gas conditioning (e.g. methanation) Minimum tar concentration Investigation of the hydrodynamic behaviour of the test facility Adjust and control the gasifier temperature 21
22 200 kw th SER DFB Gasification Pilot Plant 22
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