role of gasification modelling in overall plant design
DESCRIPTION
Talk held at the gasification workshop of the Finnish - Swedish Flame Days in 2013.TRANSCRIPT
Role of gasification modelling in overall plant design
Flame Days 2013 seminarIlkka HannulaVTT Technical Research Centre of Finland
208/04/2013
Simplified block diagram of a BTL plant
308/04/2013
Simplified block diagram of a BTL plant
408/04/2013
www.vtt.fi/inf/julkaisut/muut/2010/Hannula1.pdf
508/04/2013
www.vtt.fi/inf/julkaisut/muut/2011/Hannula301210.pdf
608/04/2013
Simplified block diagram of a BTL plant
708/04/2013
808/04/2013
Experimental conversions as a function of reactor temperature(G = T gasif, R = T reforming)
908/04/2013
Most importantnon-equilibrium phenomena
1008/04/2013
With reformer, main componentscome very close to eq. and modelresults are usually satisfactory
1108/04/2013
Model validation based on raw gas- Fairly good resultsreached
- Expected experimentalerror ~5 %
- Even better matchreached with reformedgas
1208/04/2013
Hydrocarbons & tar
Residualmethane
1308/04/2013
1408/04/2013
Product gasHot gas filtration
Reforming of the filtered product gas
T = 850 °C
T = 550 °C
T = 950 °C
Product gasHot gas filtration
Reforming of the filtered product gas
T = 850 °C T = 850 °C T = 850 °C
1508/04/2013
1608/04/2013
1708/04/2013
Liquid transportation fuels via large-scale fluidised-bedgasification of lignocellulosic biomass
(I. Hannula and E. Kurkela, 2013)
• Feedstock input 300 MWth (50 wt%, LVH) to dryer for all simulated designs• 4 end-product considered: methanol, DME, FT liquids and MTG• 5 individual plant designs simulated• 20 cases compared:
• Overall thermodynamic efficiency (on LHV basis)• Economics (capital cost estimates & levelised production costs)
CASE 1 2 3 4 5 Front-end Currently proven Further R&D required Steam system Condensing CHP CHP CHP CHP Filtration 550 °C 550 °C 850 °C 850 °C 850 °C Gasification 5 bar 5 bar 5 bar 22 bar 22 bar CO2 Vent Vent Vent Vent CCS
1808/04/2013
Liquid transportation fuels via large-scale fluidised-bedgasification of lignocellulosic biomass
(I. Hannula and E. Kurkela, 2013)
• Feedstock input 300 MWth (50 wt%, LVH) to dryer for all simulated designs• 4 end-product considered: methanol, DME, FT liquids and MTG• 5 individual plant designs simulated• 20 cases compared:
• Overall thermodynamic efficiency (on LHV basis)• Economics (capital cost estimates & levelised production costs)
CASE 1 2 3 4 5 Front-end Currently proven Further R&D required Steam system Condensing CHP CHP CHP CHP Filtration 550 °C 550 °C 850 °C 850 °C 850 °C Gasification 5 bar 5 bar 5 bar 22 bar 22 bar CO2 Vent Vent Vent Vent CCS
1908/04/2013
CASE 1 2 3 4 5
Gasifier
Pressure bar 5 5 5 22 22
Temperature °C 850 850 850 850 850
Heat loss % 1.2 1.2 1.2 1.3 1.3
Steam/O2 - 1.0 1.0 1.0 0.8 0.8
Carbon conversion % 98 98 98 96 96
Recycle gas / O2 - 0.0 0.0 0.0 0.7 0.7
Recycle gas flow kg/s 0.0 0.0 0.0 4.0 4.0
S/O2 inlet temp °C 203 203 203 210 210
Filter
Temperature °C 550 550 850 850 850
Reformer
Outlet temperature °C 957 957 957 957 957
Heat loss % 1.6 1.6 1.5 1.6 1.6
Steam/O2 - 1.0 1.0 1.0 1.2 1.2
Methane in (dry) mol% 8.8 8.8 8.8 9.1 9.1
Methane out (dry) mol% 0.4 0.4 0.4 2.3 2.3
Methane conversion % 95 95 95 70 70
S/O2 inlet temp °C 206 206 206 291 291
N2 out (dry) mol% 1.1 1.1 1.1 1.1 1.1
2008/04/2013
CASE 1 2 3 4 5
Gasifier
Pressure bar 5 5 5 22 22
Temperature °C 850 850 850 850 850
Heat loss % 1.2 1.2 1.2 1.3 1.3
Steam/O2 - 1.0 1.0 1.0 0.8 0.8
Carbon conversion % 98 98 98 96 96
Recycle gas / O2 - 0.0 0.0 0.0 0.7 0.7
Recycle gas flow kg/s 0.0 0.0 0.0 4.0 4.0
S/O2 inlet temp °C 203 203 203 210 210
Filter
Temperature °C 550 550 850 850 850
Reformer
Outlet temperature °C 957 957 957 957 957
Heat loss % 1.6 1.6 1.5 1.6 1.6
Steam/O2 - 1.0 1.0 1.0 1.2 1.2
Methane in (dry) mol% 8.8 8.8 8.8 9.1 9.1
Methane out (dry) mol% 0.4 0.4 0.4 2.3 2.3
Methane conversion % 95 95 95 70 70
S/O2 inlet temp °C 206 206 206 291 291
N2 out (dry) mol% 1.1 1.1 1.1 1.1 1.1
2108/04/2013
CH4 flow 3.8 MW 22.8 MW
For a plant having 300 MW biomass input (LHV, AR @ 50 wt% moisture)
229 MW 250 MW 242 MW
2208/04/2013
Fischer-Tropsch designSynthesis• Shell Middle Distillate Synthesis
(Bintulu, Pearl)• Cobalt-based (Co/Zr/SiO2) LTFT • Very paraffinic syncryde, less alkenes and
oxygenates than in any other large-scale industrial FT technology.
• 80 % per-pass conversion, ~ 0.90 • Multitubular fixed-bed reactor at 200 °C and
30 bar.Recovery & upgrade• C5 recovered by condensation at 45 °C
and Psynth• No cryogenic separation of C1-C2• Hydrocracker at 325 °C and 40 bar with noble
metal hydrocracking catalyst
Simplified layout of the FT synthesis, product recovery and refinery section, adapted SMDS design. From: Arno de Klerk (2011) Fischer-Tropsch refining, Wiley-VCH, 642pp, ISBN 9783527326051
2308/04/2013
2408/04/2013For a plant having 300 MW biomass input (LHV, AR @ 50 wt% moisture)
2508/04/2013
What is the overall impact?
2608/04/2013
CAPITAL COSTS, M€ 5BAR/550C 5BAR/850C 22BAR/850C
Auxiliary equipment 97.0 93.6 93.6
Buildings 18.8 18.8 18.8
Oxygen production 47.2 43.8 43.7
Feedstock pretreatment 31.1 31.1 31.1
Gasification island 150.9 151.4 149.3
Gasification 51.1 51.1 51.1
Hot-gas cleaning 38.7 37.9 39.5
CO shift 6.2 6.6 7.1
Syngas cooling 10.2 10.2 10.6
Compression 8.9 8.9 5.7
Acid gas removal 35.9 36.8 35.3
Power island 27.1 23.9 30.0
Fischer-Tropsch synthesis 77.0 80.9 80.1
FT reactor 41.2 43.4 43.0
HC recovery plant 8.1 8.6 8.5
H2 production (PSA system) 1.4 1.5 1.4
Wax hydrocracking 25.7 26.9 26.7
FT recycle compressor 0.5 0.5 0.6
TOTAL OVERNIGHT CAPITAL 352.1 349.9 353.0
TOTAL CAPITAL INVESTMENT 369.7 367.4 370.7
Cost estimationmethods- Detailed mass & energy
balances used as abasis for equipmentsizing
- Chemical Engineer’sPlant Cost Index usedto account inflation
- Component costsscaled using individualexponents:
For a plant having 300 MW biomass input (LHV, AR @ 50 wt% moisture)
2708/04/2013
Investment cost factorsBalance of Plant 30 %Indirect costs 22 %Contingency for standard components 20 %Contingency for less mature components 30 %Interest during construction, fraction of TPC 5 %Capital charges factor, (10%, 20a) 12 %O&M costs factor, fraction of TPC/a 4 %Public investment support, M€ 0
Indirect costsEngineering & head office costs 15 %, start-up costs 5 % and royalties & fees 2 %
O&MPersonnel costs 0.5 % Maintenance & insurances 2.5 %Catalysts & chemicals 1 %
BOPinstrumentation and controls, electrical connections, piping, insulation, and site preparation
PricesBiomass, €/MWh 17Electricity, €/MWh 50District heat, €/MWh 30
Plant factorsTotal biomass use, MW, AR 300Target year for costs 2010Annual peak load demand for heat, h/a 5500Capacity factor 90 %
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2908/04/2013
3008/04/2013
• Mature technology• No investment support• No CO2 credits• No tax assumptions
Gasoline@150$/bbl
Gasoline@100$/bbl
Before tax, incl. refining margin,
1 € = 1.33 $ (2010)
Levelised production cost300 MW Biomass @ 17 €/MWh, 0.12 CCF
Electricity 50 €/MWh, DH 30 €/MWh@5500 h/a
3108/04/2013
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