1 Introduction
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fuel type,
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bed material type,
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gasification agent,
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temperature, and
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steam-to-carbon ratio,
2 Description of the advanced dual fluidized bed gasifier
2.1 General description
2.2 Fluid dynamics of the advanced reactor design
-
a typical hot gasification test run with olivine (dp = 0.28 mm) as the bed material [21].
2.3 Online measurement equipment
2.4 Offline measurement equipment
General information | |||
---|---|---|---|
Solvent | – | Toluene | Isopropanol |
Measurement point | – | After upper GR | After upper GR |
Gasified fuel | – | Bark (BA) | Bark (BA) |
Bed material | – | Limestone | Limestone |
Gasification temperature | °C | ≈ 748 | ≈ 748 |
Water content | % | 42 | n.d. |
Gravimetric tar | g/Nm3db | 0.74 | 0.62 |
Sum GC-MS tar | g/Nm3db | 2.12 | 2.03 |
Single GC-MS tar components | |||
Phenylacetylene | mg/Nm3db | 0 | 0 |
Styrene | mg/Nm3db | 50 | 23 |
Mesitylene | mg/Nm3db | 0 | 0 |
Phenol | mg/Nm3db | 0 | 0 |
Benzofuran | mg/Nm3db | 0 | 0 |
1H-indene | mg/Nm3db | 75 | 40 |
2-Methylphenol | mg/Nm3db | 0 | 0 |
4-Methylphenol | mg/Nm3db | 0 | 0 |
2-Methylbenzofuran | mg/Nm3db | 0 | 0 |
2,6-Dimethylphenol | mg/Nm3db | 0 | 0 |
2,5- and 2,4-Dimethylphenol | mg/Nm3db | 0 | 0 |
3,5-Dimethylphenol | mg/Nm3db | 0 | 0 |
2,3-Dimethylphenol | mg/Nm3db | 0 | 0 |
3,4-Dimethylphenol | mg/Nm3db | 0 | 0 |
2-Methoxy-4-methylphenol | mg/Nm3db | 0 | 0 |
Naphthalene | mg/Nm3db | 1464 | 1486 |
1-Benzothiophene | mg/Nm3db | 0 | 0 |
Quinoline | mg/Nm3db | 0 | 0 |
2-Methylnaphthalene | mg/Nm3db | 16 | 0 |
Isoquinoline | mg/Nm3db | 0 | 0 |
1-Methylnaphthalene | mg/Nm3db | 0 | 0 |
1-Vinylnaphthalene | mg/Nm3db | 0 | 0 |
2-Vinylnaphthalene | mg/Nm3db | 0 | 0 |
1-Indanone | mg/Nm3db | 0 | 0 |
Eugenol | mg/Nm3db | 0 | 0 |
Indole | mg/Nm3db | 0 | 0 |
Biphenyl | mg/Nm3db | 16 | 13 |
Isoeugenol | mg/Nm3db | 0 | 0 |
Acenaphthylene | mg/Nm3db | 131 | 109 |
Acenaphthene | mg/Nm3db | 38 | 39 |
Dibenzofuran | mg/Nm3db | 0 | 0 |
Fluorene | mg/Nm3db | 0 | 0 |
Dibenzothiophene | mg/Nm3db | 0 | 0 |
2-Methylpyridine | mg/Nm3db | 0 | 0 |
3- and 4-Methylpyridine | mg/Nm3db | 0 | 0 |
Anthracene | mg/Nm3db | 300 | 282 |
Phenanthrene | mg/Nm3db | 13 | 22 |
Carbazole | mg/Nm3db | 0 | 0 |
4,5-Methylphenanthrene | mg/Nm3db | 0 | 0 |
9-Methylanthracene | mg/Nm3db | 0 | 0 |
Fluoranthene | mg/Nm3db | 12 | 8 |
Pyrene | mg/Nm3db | 8 | 6 |
Benzo[a]anthracene | mg/Nm3db | 0 | 0 |
Chrysene | mg/Nm3db | 0 | 0 |
Benzo[b]fluoranthene | mg/Nm3db | 0 | 0 |
Benzo[k]fluoranthene | mg/Nm3db | 0 | 0 |
Benzo[a]pyrene | mg/Nm3db | 0 | 0 |
Benzo[e]pyrene | mg/Nm3db | 0 | 0 |
Benzo[g,h,i]perylene | mg/Nm3db | 0 | 0 |
Dibenz[a,h]anthracene | mg/Nm3db | 0 | 0 |
Indeno[1,2,3-cd]pyrene | mg/Nm3db | 0 | 0 |
Perylene | mg/Nm3db | 0 | 0 |
Coronene | mg/Nm3db | 0 | 0 |
Single BTEX components | |||
Benzene | mg/Nm3db | 6951 | 7464 |
Toluene | mg/Nm3db | n.d. | 3821 |
Ethylbenzene | mg/Nm3db | 0 | 0 |
m- and p-Xylene | mg/Nm3db | 0 | 0 |
o-Xylene | mg/Nm3db | 0 | 0 |
2.5 Fuel types, fuel feeding, and bed material
Parameter | Unit | Meas. accuracy (%) | SW | HNS | BA | SCB | RH | BA + CMa | CM | BA + CM + STb | LI |
---|---|---|---|---|---|---|---|---|---|---|---|
Water content | wt% | ± 4.3 | 7.2 | 9.4 | 7.7 | 7.7 | 7.5 | 8.7 | 9.1 | 9.3 | 5.8 |
Ash content | wt%db | ± 9.2 | 0.2 | 1.5 | 7 | 2.3 | 15.2 | 12.9 | 25.4 | 12.5 | 9.1 |
Carbon (C) | wt%daf | ± 1 | 50.8 | 52.7 | 52.3 | 48.9 | 51.2 | 51.5 | 50.1 | 51.8 | 57.2 |
Hydrogen (H) | wt%daf | ± 5 | 5.9 | 5,6 | 6.0 | 5.9 | 6.1 | 6.2 | 6.5 | 6.3 | 6.1 |
Nitrogen (N) | wt%daf | ± 5 | 0.200 | 0.37 | 0.342 | 0.409 | 0.554 | 1.964 | 5.509 | 1.490 | 1.860 |
Sulfur (S) | wt%daf | ± 7.5 | 0.005 | 0.027 | 0.053 | 0.051 | 0.071 | 0.225 | 0.664 | 0.150 | 0.145 |
Chlorine (Cl) | wt%daf | ± 7.5 | 0.005 | 0.028 | 0.053 | 0.061 | 0.106 | 0.216 | 0.448 | 0.170 | 0.015 |
Oxygen (O)* | wt%daf | – | 43.1 | 41.3 | 41.3 | 44.7 | 42.0 | 39.9 | 36.8 | 40.1 | 34.7 |
Volatile matter | wt%daf | ± 0.45 | 85.6 | 76.4 | 77.7 | 85.7 | 80.7 | 80.8 | 90.6 | 79.9 | 74.4 |
Lower heating value, moist | MJ/kg | ± 1 | 17.4 | 17.3 | 16.6 | 16.3 | 14.5 | 14.9 | 12.4 | 15.0 | 18.8 |
Ash deform. temp. (A) | °C | – | 1330 | 720 | n.a. | 1180 | > 1350 | 1240 | n.o. | 1180 | 1470 |
Ash flow temp. (D) | °C | – | 1440 | > 1500 | n.a. | 1330 | n.o. | 1340 | > 1490 | 1250 | 1490 |
Parameter | Unit | Limestone | Feldspar | Quartz | Olivine |
---|---|---|---|---|---|
Al2O3 | wt% | 0.1–0.3 | 17.5–18.5 | 0.07–0.1 | – |
CaCO3 | wt% | 95.5–97.0 | – | – | – |
Fe2O3 | wt% | 0.1–0.3 | 0.04–0.05 | 0.03–0.05 | 8.0–10.5 |
K2O | wt% | – | 14.5–15.0 | – | – |
MgCO3 | wt% | 1.5–4.0 | – | – | – |
MgO | wt% | – | – | – | 48.4–50.0 |
Na2O | wt% | – | 0.7–1.0 | – | – |
SiO2 | wt% | 0.4–0.6 | 65.0–66.0 | 99.0–99.9 | 39.4–42.0 |
Other trace elements | wt% | 0.2–2.5 | 0.3–2.3 | 0.05–0.9 | 0.3–3.0 |
Hardness | Mohs | 3 | 6 | 7 | 6.5 |
Sauter mean diameter (dp = dsv) | mm | 0.48 | 0.29 | 0.29 | 0.26 |
Particle size range (dp10–dp90) | mm | 0.34–0.72 | 0.24–0.40 | 0.23–0.50 | 0.20–0.34 |
Particle density | kg/m3 | 2650, 1500a | 2600 | 2650 | 2900 |
2.6 Process simulation via IPSEpro and calculation of key figures
3 Results from gasification experiments
3.1 Temperature and pressure profiles
3.2 Fuel variation
Parameter | Unit | SW | HNS | BA | SCB | RH | BA + CMa | CM | BA | BA + CM + STb | LI |
---|---|---|---|---|---|---|---|---|---|---|---|
Bed material | wt% | 100% limestone | 100% limestone | 100% limestone | 100% limestone | 90% limestone + 10% olivine | 90% feldspar + 10% limestone | 90% feldspar + 10% limestone | 90% quartz + 10% limestone | 100% feldspar | 100% olivine |
Steam/fuel ratio φSF | kgH2O/kgfuel,daf | 0.7 | 0.7 | 1.0 | 0.7 | 0.9 | 0.8 | 0.9 | 1.0 | 0.9 | 1.0 |
Steam/carbon ratio φSC | kgH2O/kgC | 1.4 | 1.5 | 2.0 | 1.5 | 1.7 | 1.6 | 1.8 | 2.0 | 1.8 | 1.8 |
Temp. in lower GR | °C | 769 | 788 | 748 | 753 | 761 | 777 | 766 | 822 | 772 | 789 |
Temp. in upper GR | °C | 991 | 938 | 924 | 975 | 904 | 964 | 933 | 955 | 961 | 918 |
Mean temp. in CR | °C | 1021 | 944 | 986 | 1021 | 946 | 996 | 952 | 979 | 975 | 945 |
Fuel input GR | kW | 101 | 96 | 101 | 102 | 105 | 100 | 114 | 96 | 105 | 102 |
Fuel input CR | kW | 52 | 34 | 38 | 51 | 36 | 55 | 62 | 71 | 46 | 44 |
Parameter | Unit | SW | HNS | BA | SCB | RH | BA + CMa | CM | BA | BA + CM + STb | LI |
---|---|---|---|---|---|---|---|---|---|---|---|
Water content | vol% | 25–29 | 23–28 | 37–42 | 35–36 | 43–46 | 31–32 | 31–35 | 29–36 | 39–41 | 32–42 |
Fly char | g/Nm3db | 1–3 | 1–2 | 7–10* | 4–9 | 5–7* | 1.5–3 | 0.5–1 | 2–4 | 1–1.5 | 0.5–2 |
Dust | g/Nm3db | 1–4 | 1–3 | 15–22* | 6–8 | 55–70* | 3–4 | 4–7 | 1–3 | 0.5–2 | 0.5–1 |
NH3 | vol ppm | n.m. | n.m. | 3300** | n.m. | 7600 | 23,800 | 73,200 | n.m. | 23,900 | n.m. |
H2S | vol ppm | 17–23 | n.m. | 190–275 | n.m. | 460 | 360–480 | 340–390 | n.m. | 140 | n.m. |
COS | vol ppm | 0.1–0.7 | n.m. | 0.3–0.7 | n.m. | n.m. | 13–16 | 25–61 | n.m. | n.m. | n.m. |
HCl | vol ppm | n.m. | n.m. | 0.6** | n.m. | n.m. | n.m. | n.m. | n.m. | 14 | n.m. |
HCN | vol ppm | n.m. | n.m. | n.m. | n.m. | n.m. | n.m. | n.m. | n.m. | 400 | n.m. |
Parameter | Unit | SW | HNS | BA | SCB | RH | BA + CMa | CM | BA | BA + CM + STb | LI |
---|---|---|---|---|---|---|---|---|---|---|---|
PGY | Nm3db/kgdaf | 1.4 | 1.5 | 1.4 | 1.2 | 1.2 | 1.4 | 1.5 | 1.8 | 1.3 | 1.6 |
Product gas volume flow | Nm3db/h | 34.4 | 27.4 | 27 | 24.9 | 23.8 | 28.2 | 31.4 | 32.6 | 26.1 | 27.2 |
LHVPG* | MJ/Nm3db | 11.3 | 11.3 | 11 | 11.7 | 12.5 | 12 | 12 | 11.4 | 11.9 | 12.7 |
Product gas power* | kW | 88 | 86 | 83 | 81 | 83 | 91 | 107 | 103 | 86 | 96 |
XH2O | kgH2O/kgH2O | 0.36 | 0.36 | 0.35 | 0.29 | 0.18 | 0.34 | 0.38 | 0.42 | 0.24 | 0.41 |
ηCG | % | 88 | 90 | 82 | 79 | 79 | 91 | 94 | 108 | 82 | 94 |
ηCG,O | % | 73 | 72 | 67 | 67 | 71 | 72 | 71 | 73 | 70 | 73 |
3.3 Bed material variation
3.4 Product gas quality before and after the upper gasification reactor
General information | |||
---|---|---|---|
Solvent | – | Toluene | Toluene |
Measurement point | – | Upper sample point (after upper GR) | Lower sample point (before upper GR) |
Gasified fuel | – | Softwood (SW) | Softwood (SW) |
Bed material | – | 90% olivine, 10% limestone | 90% olivine, 10% limestone |
Gasification temperature | °C | ≈ 848 | ≈ 848 |
Water content | % | 38 | 31 |
Gravimetric tar | g/Nm3db | 1.46 | 12.10 |
Sum GC-MS tar | g/Nm3db | 4.53 | 16.63 |
Single GC-MS tar components | |||
Phenylacetylene | mg/Nm3db | 0 | 185 |
Styrene | mg/Nm3db | 73 | 1600 |
Mesitylene | mg/Nm3db | 0 | 17 |
Phenol | mg/Nm3db | 0 | 2745 |
Benzofuran | mg/Nm3db | 0 | 479 |
1H-Indene | mg/Nm3db | 113 | 2551 |
2-Methylphenol | mg/Nm3db | 0 | 301 |
4-Methylphenol | mg/Nm3db | 0 | 797 |
2-Methylbenzofuran | mg/Nm3db | 0 | 67 |
2,6-Dimethylphenol | mg/Nm3db | 0 | 0 |
2,5- and 2,4-Dimethylphenol | mg/Nm3db | 0 | 91 |
3,5-Dimethylphenol | mg/Nm3db | 0 | 81 |
2,3-Dimethylphenol | mg/Nm3db | 0 | 63 |
3,4-Dimethylphenol | mg/Nm3db | 0 | 0 |
2-Methoxy-4-methylphenol | mg/Nm3db | 0 | 0 |
Naphthalene | mg/Nm3db | 2438 | 3106 |
1-Benzothiophene | mg/Nm3db | 0 | 0 |
Quinoline | mg/Nm3db | 0 | 0 |
2-Methylnaphthalene | mg/Nm3db | 0 | 567 |
Isoquinoline | mg/Nm3db | 0 | 0 |
1-Methylnaphthalene | mg/Nm3db | 0 | 381 |
1-Vinylnaphthalene | mg/Nm3db | n.a. | n.a. |
2-Vinylnaphthalene | mg/Nm3db | n.a. | n.a. |
1-Indanone | mg/Nm3db | 0 | 31 |
Eugenol | mg/Nm3db | 0 | 0 |
Indole | mg/Nm3db | 0 | 58 |
Biphenyl | mg/Nm3db | 55 | 212 |
Isoeugenol | mg/Nm3db | 0 | 0 |
Acenaphthylene | mg/Nm3db | 664 | 1301 |
Acenaphthene | mg/Nm3db | 16 | 64 |
Dibenzofuran | mg/Nm3db | 27 | 190 |
Fluorene | mg/Nm3db | 27 | 367 |
Dibenzothiophene | mg/Nm3db | 0 | 0 |
2-Methylpyridine | mg/Nm3db | n.a. | n.a. |
3- and 4-Methylpyridine | mg/Nm3db | n.a. | n.a. |
Anthracene | mg/Nm3db | 499 | 482 |
Phenanthrene | mg/Nm3db | 103 | 171 |
Carbazole | mg/Nm3db | 0 | 0 |
4,5-Methylphenanthrene | mg/Nm3db | 23 | 130 |
9-Methylanthracene | mg/Nm3db | 0 | 0 |
Fluoranthene | mg/Nm3db | 219 | 187 |
Pyrene | mg/Nm3db | 177 | 171 |
Benzo[a]anthracene | mg/Nm3db | 40 | 82 |
Chrysene | mg/Nm3db | 57 | 71 |
Benzo[b]fluoranthene | mg/Nm3db | 0 | 37 |
Benzo[k]fluoranthene | mg/Nm3db | 0 | 0 |
Benzo[a]pyrene | mg/Nm3db | 0 | 45 |
Benzo[e]pyrene | mg/Nm3db | n.a. | n.a. |
Benzo[g,h,i]perylene | mg/Nm3db | 0 | 0 |
Dibenz[a,h]anthracene | mg/Nm3db | 0 | 0 |
Indeno[1,2,3-cd]pyrene | mg/Nm3db | 0 | 0 |
Perylene | mg/Nm3db | n.a. | n.a. |
Coronene | mg/Nm3db | n.a. | n.a. |
Single BTEX components | |||
Benzene | mg/Nm3db | n.a. | n.a. |
Toluene | mg/Nm3db | n.d. | n.d. |
Ethylbenzene | mg/Nm3db | n.a. | n.a. |
m- and p-Xylene | mg/Nm3db | n.a. | n.a. |
o-Xylene | mg/Nm3db | n.a. | n.a. |
3.5 Change of product gas and tar content along gasification reactor height
3.6 Influence of H2O and CO2 as gasification agents
3.7 Sorption-enhanced gasification—description of the process
3.8 Influence of cycle rate on sorption-enhanced gasification
3.9 Temperature variation
3.10 Steam-to-carbon variation
3.11 Detailed gas analysis of dual fluidized bed steam gasification
Unit | Mean value | Typical min. | Typical max. | |
---|---|---|---|---|
General information | ||||
Bed material | – | Olivine | ||
Fuel type | – | Wood chips | ||
Gasification temperature | °C | 840 | 830 | 860 |
Temp. after bio-diesel scrubber | °C | 40 | 35 | 45 |
Water (H2O) content | vol% | 8 | 5 | 12 |
Other gaseous components | vol% | 92 | 88 | 95 |
Product gas components | ||||
Hydrogen (H2) | vol%db | 40 | 36 | 44 |
Carbon monoxide (CO) | vol%db | 23 | 20 | 29 |
Carbon dioxide (CO2) | vol%db | 22 | 18 | 25 |
Methane (CH4) | vol%db | 9.7 | 8 | 12 |
Acetylene (C2H2) | vol%db | 0.1 | 0.05 | 0.15 |
Ethylene(C2H4) | vol%db | 2.5 | 1.0 | 3.5 |
Ethane (C2H6) | vol%db | 0.3 | 0.1 | 0.5 |
Propane (C3H8) | vol%db | 0.4 | 0.3 | 0.6 |
Oxygen (O2) | vol%db | 0.1 | 0.0 | 0.3 |
Nitrogen (N2) | vol%db | 1.5 | 0.5 | 3.5 |
Hydrogen sulfide (H2S) | vol ppmdb | 60 | 20 | 190 |
Carbonyl sulfide (COS) | vol ppmdb | 4 | 0.3 | 8 |
Thiophene (C4H4S) | vol ppmdb | 10 | 3 | 25 |
Ammonia (NH3) | vol ppmdb | 950 | 500 | 1800 |
Mercaptanes (RSH) | vol ppmdb | 5 | 1 | 10 |
Hydrogen chloride (HCl) | vol ppmdb | 2 | 0.2 | 7 |
Hydrogen cyanide (HCN) | vol ppmdb | 10 | 5 | 30 |
Benzene (C6H6), B | mg/Nm3db | 14,000 | 7000 | 22,000 |
Toluene (C7H8), T | mg/Nm3db | 2800 | 800 | 4000 |
Ethylbenzene (C6H5CH2CH3), E | mg/Nm3db | 100 | 10 | 300 |
Xylene ((CH3)2C6H4), X | mg/Nm3db | 250 | 20 | 700 |
Dust particles | mg/Nm3db | 10 | 5 | 20 |
Char particles | mg/Nm3db | 8 | 3 | 15 |
Grav. tar | mg/Nm3db | 140 | 50 | 300 |
GC-MS tar (without BTEX)a | mg/Nm3db | 2100 | 330 | 4600 |