30th ISTC Japan Workshop on Advanced Catalysis Technologies in Russia Fluidized bed catalytic pyrolysis and gasification of biomass for production of fuel out of renewable resources Prof. Z.R.Ismagilov Laboratory of Environmental Catalysis, Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia, www.catalysis.ru/envicat BIOMASS YEARLY WORLD GROWTH - UP TO 200*109 t TO DATE YEARLY BIOMASS CONSUMPTION (FOOD, CONSTRUCTION, FUEL PRODUCTION) - 3-4 % ADDITIONAL INVOLVING OF 3 % OF BIOMASS FOR FUEL PRODUCTION IS EQUIVALENT TO 3*109 t OF CRUDE OIL REPLACEMENT Diagram of biomass processing and utilization Catalytic fluidized bed for biomass pyrolysis and gasification 1. Increase of the process rate and decrease of the temperature to 600-700оС 2. Increase of the content of H2 and CO in the products to 10-15 vol.% and regulation of H2/CO ratio 3. Decrease of the yield of liquid and solid products of pyrolysis 4. Production of low tar or tar free synthesis gas. Experimental • For the studies semolina was taken as a biomass model object, with the following chemical composition (wt. %): hydrogen 6.92; carbon 39.18; nitrogen 1.81; ash 1.17. • The combustion catalyst CuxMg1-xCr2O4/-Al2O3 (IC-12-73) was used in the experiments. The inert bed material used in the setups 2 and 3 was granulated -Al2O3. • All setups were equipped with the system for on-line continuous gas sampling for GC analysis. • The goal of this work was to study the processes of biomass pyrolysis and gasification in experimental facilities containing fluidized bed reactors. Three setups used in this work were different by the way of conducting the pyrolysis and gasification processes. Experimental setup 1 In the setup 1 the reactor contains fluidized bed catalyst in lower part for catalytic combustion of fuel. The height of the fluidized bed being 50 cm and biomass was fed directly to the hot fluidized bed at the height of 40 cm. Experimental setup 2 The setup 2 contains two fluidized bed reactors. Lower reactor is for fuel catalytic combustion and upper reactor loaded by inert bed material (-Al2O3). The biomass was fed into the fluidized bed of the upper reactor. Scheme of experimental setup 1 1,2 – reactor: 1 – lower part with fluidized bed of catalyst; 2 – upper part; 3 - high-temperature cyclone; 4 - lowtemperature cyclone; 5 – biomass feeder; 6 - rotameter; 7 - valve; 8 – reservoir with fuel; 9 - multi channel temperature control system; 10 - plunger micro pump for fuel injection; 11 - grid filter and fine filter; 12 - ejector Characteristics of the setups. Characteristics Dimensions, mm Reactor type material diameter, mm Catalyst loading, dm3 fraction, mm Inert bed loading, dm3 fraction, mm Temperature of working zone, oC Air flow, m3/h Fuel flow, l/h Biomass flow, kg/h Setup 1 1800 x 600 x 600 FB stainless steel 50 IC-12-72 0.5 1.6-2.0 - 650-800 2.5 0.2 0.3 Value Setup 2 2500х2500х600 FB stainless steel 50 IC-12-72 1.0 1.6-2.0 -Al2O3 0.3 2.0-2.5 650-800 6.0 0.3 0.5 Setup 3 4000 x 3000 x 1500 FB stainless steel 300 IC-12-72 4.0-5.0 0.4-0.8 -Al2O3 3.0 0.2-0.4 650-800 30 1-1.5 10 The experimental conditions and results of GC analysis of reaction products. Temperature in the biomass feeding zone – 750oC.Setup 1. Products, % vol. FID TCD Fuel * inject CH4 C2H6 C3H8 C4H10 iso- C5H12 CO N2 O2 H2 Air, C4H10 m3/h experiments with variation of air flow (in fluidized bed) 0 0 0.01 0.01 0.01 0.03 0.01 78.4 11.3 0.2 0.87 0.375 0.175 0.02 0.01 0.06 0.09 0.08 0.1 0.6 77.6 8.9 1.2 0.83 0.375 0.175 0.09 0.06 0.4 0.5 0.4 0.6 1.8 78.1 6.3 2.7 0.79 0.375 0.175 0.3 0.3 0.7 0.9 0.8 1.2 4.3 79.9 3.2 4.1 0.71 0.375 0.175 0.6 0.7 0.8 1.3 1.2 1.8 6.3 77.8 1.0 5.2 0.63 0.375 0.175 experiments at fixed air flow (checking stability of the process) 0.4 0.5 0.8 1.0 0.9 1.3 5.1 78.2 2.8 4.6 0.67 0.375 0.175 0.3 0.4 0.8 0.9 1.0 1.2 4.9 78.1 2.7 4.4 0.67 0.375 0.175 0.3 0.5 0.7 0.9 0.8 1.1 5.2 77.9 2.9 4.0 0.67 0.375 0.175 0.4 0.4 0.7 0.9 0.8 1.3 4.7 77.9 3.0 3.9 0.67 0.375 0.175 0.4 0.4 0.7 0.8 0.8 1.3 5.0 78.0 2.7 4.3 0.67 0.375 0.175 experiments with variation of air flow (at fixed total gas flow in fluidized bed) 0.2 0.3 0.7 1.4 1.5 2.1 7.2 78.2 0.5 5.6 0.51 0.375 0.175 0.15 0.3 0.5 1.1 1.3 1.6 6.5 77.5 0.9 5.0 0.63 0.375 0.175 0.1 0.1 0.2 0.07 0.9 1.3 5.1 77.3 2.9 4.5 0.71 0.375 0.175 0.01 0.01 0.02 0.4 0.05 0.4 1.5 78.4 7.8 2.3 0.83 0.375 0.175 0 0 0 0.01 0.01 0.01 0.1 78.5 8.8 0.3 0.95 0.375 0.175 Feed conditions Fluidized Ejector bed N2, N2, Air, m3/h m3/h m3/h Fuel, l/h Semo lina, kg/h 0.1 0.1 0.1 0.1 0.1 0.3 0.3 0.3 0.3 0.3 1.5 1.4 1.3 1.1 0.9 0 0 0 0 0 0.1 0.1 0.1 0.1 0.1 0.3 0.3 0.3 0.3 0.3 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0.1 0.1 0.1 0.1 0.1 0.3 0.3 0.3 0.3 0.3 0.6 0.9 1.1 1.4 1.7 1.6 1.3 1.1 0.8 0.5 * is oxygen to fuel equivalence ratio, i.e. the ratio of the actual amount of supplied oxygen to that of oxygen required for complete combustion of biomass and fuel Experimental setup 2 The setup 2 contains two fluidized bed reactors. Lower reactor is for fuel catalytic combustion and upper reactor loaded by inert bed material (-Al2O3). The biomass was fed into the fluidized bed of the upper reactor. Pyrolysis and gasification of semolina in fluidized beds with different materials. Setup 2. No. Gases content О2, Н2 , СО, СН4, NOx, Примечание % vol. % vol. % vol. % vol. mg/m3 Fuel (without semolina) 850-900oC 1 2.6 0.51 41 2 2.7 0.50 32 Experiment 1; fuel – 300 ml/h, semolina - 1000 g/h, quartz – 300 ml, 700oC 6 0.1 1.53 10.12 0.35 961 Н2 - 1.44% СО – 10.02% 7 0.0 1.48 9.98 0.35 1084 СН4 – 0.35% 8 0.0 1.33 10.12 0.35 1043 Experiment 2; fuel – 300 ml/h, semolina - 1000 g/h, quartz – 300 ml + catalyst – 100 ml, 700oC 11 0.0 5.84 10.64 0.89 890 Н2 - 5.84% СО – 10.54% 12 0.0 5.84 10.63 0.98 974 СН4 – 0.92% 13 0.0 5.84 10.46 0.88 986 Experiment 3; fuel – 300 ml/h, semolina - 950 g/h, Al2O3 – 300 ml, 750oC 11 0.0 4.8 5.96 0.71 1865 Н2 - 4.7% СО - 5.79% 12 0.0 4.6 5.87 0.73 1838 СН4 - 0.72% 13 0.0 4.7 5.64 0.71 1874 Conversion of biomass upon the variation of specific biomass flow. Setup 3. Dependencies of the content of gaseous products of air conversion of biomass and initial gases on the value of specific biomass flow. Height of the stationary bed - 0.32 m, height of fluidized bed - 0.5 m, loading of -Al2O3 (d=1mm) - 2.5 dm3, T = 720-780oC, residence time - 0.45 c. Conversion of biomass upon the variation of contact time with reaction medium. Setup 3. Dependencies of the content of gaseous products of air conversion of biomass and initial gases on the biomass contact time with reaction medium. Light dots – inert packing -Al2O3; dark dots – catalyst IC-12-72. Height of fluidized bed - 0-0.5 m, loading of -Al2O3 (d=1mm) - 0-2.4 dm3, T = 670-700oC, biomass flow - 5.8-7.2 kg/h, specific biomass flow - 0.71-0.88 kg/m3. Conversion of biomass upon the variation of additional steam flow Setup 3. Technological characteristics of the process of steam-air biomass conversion upon the variation of additional steam flow (experiments 1-3) and of the biomass pyrolysis process (experiment 4). No. 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 Parameters Meas. units No. of experiment Steam-air conversion Pyrolysis 1 2 3 4 Technological parameters of the process Air flow m3/h 8.2 8.2 8.2 Nitrogen flow m3/h 8.2 Biomass flow kg/h 6.7 6.7 4.1 8.3 Specific biomass flow kg/m3 0.8 0.8 0.5 1.0 Water flow kg/h 0.5 1.1 1.8 0 3 Specific water flow kg/m 0.06 0.13 0.22 0 Water flow/biomass flow g/kg 75 160 435 0 o Initial bed temperature C 615 630 625 620 o Operating bed temperature C 705 700 710 570 o Temperature in CHG C 660 670 670 650 Composition of the steam-air conversion and pyrolysis products H2 vol.% 9.0 9.0 5.5 0 O2/Ar vol.% 4.0 3.0 4.9 2.8 N2 vol.% 57.2 52.0 62.3 72.8 CH4 vol.% 1.5 2.0 0.9 0.9 CO vol.% 12.4 15.0 7.4 7.0 CO2 vol.% 9.4 13.0 10.0 3.5 C2H4 vol.% 1.0 1.0 0.5 0.4 C2H6 vol.% 0.1 0.l 0 0.1 H2O vol.% 2.0 2.0 2.0 2.0 Balance vol.% 96.8 97.1 93.5 89.5 Results of the GC/MS analysis of liquid fraction of the biomass pyrolysis and gasification products. Setup 1. No. 1 Name Acetic acid Formula C2H4O2 2 Acetohydroxamic acid 3 Structure No. 7 Name 2,5-Hexanedione Formula C6H10O2 C2H5NO2 8 2,5-Furandione, 3methyl- C5H4O3 Propanoic acid C3H6O2 9 Phenol C6H6O 4 Pyridine C5H5N 10 2-Cyclopenten-1one, 2-hydroxy-3methyl C6H8O2 5 Pyridine, 2methyl- C6H7N 11 1,4 : 3,6-Dianhydroalpha-dglucopyranose C6H8O4 6 2(5H)-Furanone C4H4O2 12 Unidentified highmolecular oxygen-containing compounds - Structure - Conclusions: 1. Main products of biomass conversion are the gases: H2, CO and CH4 . The maximum quantaties of these products are: H2 - 8-11% vol., CO - 18-20%vol., CH4 - 2-2.5%vol. 2. Conducting pyrolysis in the inert atmosphere, or conversion with the addition of water vapor into the reaction zone do not have any advantages over the conventional catalytic process 3. At the values of oxygen excess ratio >0.60-0.65 the process proceeds with preferential formation of the gaseous conversion products, while at the values <0.60 the evolving of liquid and solid products is also noticeable; at <0.50 the evolving of liquid and solid products becomes very abundant, while that of the gaseous products, on the contrary, decreases. Most optimal is to conduct the process at ~0.5-0.65. In this case, the values of the yields of gaseous products of biomass pyrolysis and gasification are maximal, and evolving of liquid and solid products is minimal.