Gasification Options for Bioenergy Projects Bush GTI.pdfCO (carbon monoxide) H 2 (hydrogen) CH 4...

14 June 2012

Gasification Options for Bioenergy Projects

Vann Bush Managing Director, Energy Conversion

2 14 June 2012

Topics

Gasification basics and general traits of various

biomass gasifier technologies

Application-specific features that affect performance and economics of gasification-based processes

Building confidence in gasification solutions

Leveraging existing infrastructure to optimize the energy value in the biomass

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What is Gasification?

SORBENT/ BED MATERIAL

FUEL: Coal, Biomass,

Wastes

GASIFIER

AIR or Oxygen STEAM

ASH AND SPENT

SORBENT

Products (syngas):

CO (carbon monoxide)

H2 (hydrogen)

CH4 (methane)

By-products:

H2S (hydrogen sulfide)

CO2 (carbon dioxide)

Solids (minerals from fuel)

Gas Cleanup Before Product

Process Conditions: Pressure = 1 to 30 atm or more Temperature =1600 – 2600

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Reactions Important in Gasification

Feed Devolatilization = CH4+ CO + CO2+ Oils + Tars + C (Char)

C + O2 = CO2 (exothermic –rapid)

C + ½O2 = CO (exothermic –rapid)

C + H2O = CO + H2 (endothermic –slower than oxidation)

C + CO2 = 2CO (endothermic –slower than oxidation)

CO + H2O = CO2+ H2 Shift Reaction (slightly exothermic–rapid)

CO + 3H2 = CH4+ H2O Methanation (exothermic)

C + 2H2 = CH4 Direct Methanation (exothermic)

5 14 June 2012

Selecting Reactions to Optimize in Example Cases

fuel gas: relatively high methane content is good, higher hydrocarbons are not necessarily bad, nitrogen and CO2 dilution is tolerable

liquid fuels*: maximize CO and H2, minimize methane content, no higher hydrocarbons, proper H2:CO ratio for synthesis, no dilution

SNG: maximize methane, no higher hydrocarbons, proper H2:CO ratio for synthesis, no dilution

* Liquids production by catalytic processes

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Biomass Constituents

Lignin: 15-25% • Complex network of aromatic compounds

• High energy content

Hemicellulose: 23-32%

• Polymer of 5 & 6 carbon sugar

Cellulose: 38-50% • Polymer of glucose

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Ranking of Fuel Volatility (Van Krevelen Diagram)

Anthracite

0.0 0.2 0.4 0.6 0.8

Atomic O:C Ratio

Volatility

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Basic Biomass Gasifier Types

Tar Production

Fuel Capacity

Can operate at high pressure

“indirect” 2-stage reactor design typical

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Updraft Gasifier Nexterra, Babcock Vølund, Condens Oy Novel, and many others

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Downdraft Gasifier Many suppliers from Ankur to Xylowatt

Ankur Scientific Gasifier energy from wood, Gujarat,India

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Indirect Gasifier (Battelle / FERCO / SilvaGas (Rentech))

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Other Indirect Gasifiers TUV/Repotec FICFB, ECN Milena, TRI, Agnion

TUV Fast Internally Circulating Fluidized Bed Milena Agnion

Product gas

Pulsed Combustors

Biomass

Fuel gas Steam

Flue gas

Combustion

Chamber

Reformer

Heatpipes

Filter Layer

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Multi-Stage Gasifier Choren Carbo-V, Cortus, Klepper,

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Fluidized Bed Gasifier GTI, Andritz/Carbona, Foster Wheeler, Metso

BIOMASS

AIR/OXYGEN

HOT PRODUCT GAS

CYCLONE

FLUIDIZED BED

ASH REMOVAL SCREW

FEEDING SCREW

FEED HOPPER

GASIFICATION REACTOR

BFB GASIFIER

CFB GASIFIER

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Typical Properties of Biomass Gasifiers

PROPERTY

• Feed size, mm • Gas exit temp, C • Tar content • Pressure, atm • Gasifying agent

• Gas heating value

• Max Scale

Updraft

• 5-100 • 300 • Very high • 1 • Air

• Low

• 100’s kW

Downdraft

• 20-100 • 700 • High • 1 • Air

• Low

• 100’s kW

Indirect

• 300-500 • 850 • High • 1 to 5 • Steam

• Medium

• 10’s MW

Fluid Bed

• >40 • 850 • Low • 1 to 30+ • Air or O2

+ steam • Low or

medium • 100’s

Multi-Stage

• >40 • 900 • Very low • 1 to 5 • Steam, O2

• Medium

• 160 MW

This list is illustrative only. It is not a comprehensive list of important properties.

16 14 June 2012

Gasification – A Means to Convert Biomass into Useful, Clean Energy Products

Gasification

Excellent Environmental Performance

Carbon Management Opportunity

Syngas Pipeline Quality Gas / Chemical Feedstock

Liquefaction

Power Plant Fuel

Power Plant

Pipeline / Chemical Plant

Transportation Fuels

17 14 June 2012

What are the strengths of biomass gasification?

1. All sorts of biomass can be converted, as well as peat, coal, pet coke, and wastes. (an answer to feed vs. food vs. fiber vs. fuel debate)

2. All the carbon in the feed is available for conversion. Gasification takes carbon from all the plant material to make product.

3. The reactions can be optimized for different applications. (This means technology choices are important and meaningful.)

4. The produced gas can be manipulated to remove contaminants, separate products, change relative concentrations (shift) – all to the specific level required to make the product and meet regulations.

5. All sorts of product options exist, and co-product options exist. The choice of application is constrained by market values and competitive economics, not the gasification process.

18 14 June 2012

What matters for process performance and economics? Everything.

Feedstock

• Energy content

• Composition • Volatility

• Moisture

• Minerals

• Handling

• Abundance

• Sustainability

Product(s)

• Value

• Market • Size

• Acceptance

• Access

• Volatility

• Drivers

Technology

• Efficiency

• Scalability

• Operability

• Reliability

target bow arrow

19 14 June 2012

Some Biomass Gasification Product Options

Biomass-to-power in boiler • Simple process design; low efficiency (20-30%); limited co-firing range; boiler and

site modifications required; commercial Biomass-to-power with engines or gas turbine

• kW to MW scale; varying efficiency (28-50%) without waste heat integration; high efficiency possible in CHP application requiring consistent heat load; commercial

Syngas fermentation for alcohols • Route to cellulosic ethanol; medium efficiency (50%); limited distribution system;

high water demand; technology still in R&D Biomass-to-Liquid transportation fuels via catalytic synthesis

• Moderate efficiency (35-45%); can be improved with significant heat/steam integration; ultra-clean gas required; direct gasoline synthesis available, whereas F-T product needs further refining; commercial technology available

Substitute Natural Gas (SNG) • High efficiency (65-70%); increased efficiency with waste heat integration; pipeline

infrastructure-ready, storable product; ultra-clean gas required; commercial technology available

(efficiency on HHV basis)

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Syngas-to-Liquids Options

Source: Bain. NREL

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Example of Product Synthesis

Graphic Source: reNet: Renewable Energy Network Austria

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Application Dictates Process Design G

Low High PRODUCT VALUE

HeatPowerFermentationFuels and Chemicals

SYNGAS APPLICATION

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Thermochemical Process Conceptual Design

Feed Processing

and Handling

Gasification Gas Cleanup

High T Separation

Gas Conditioning

Collection/Fractionation

Fuel Synthesis

Upgrading

Heat &

Products

Based on: Phillips, S.; Aden, A.; Jechura, J.; Dayton, D.; Eggeman, T. (2007). Thermochemical Ethanol via Indirect Gasification and Mixed Alcohol Synthesis of Lignocellulosic Biomass. 132 pp.; NREL Report No. TP-510-41168.

24 14 June 2012

What are the challenges for biomass gasification applications?

Variable biomass composition imposes design inefficiencies and makes it harder to manage produced gas quality to meet application needs.

There are so many choices and claims for technology, and yet so few successful reference plants. What are false economies and what are prudent choices?

Higher value products requires higher capital expense which favors large-scale production.

Immature technology options cause uncertainty in process selection. Scaling up with confidence takes time.

25 14 June 2012

Gasifier Application Development: Reducing Risk & Building Confidence

Feedstock Properties Tests

Laboratory Gasification Tests

Pilot-Scale Tests

Process Design Package for Commercial Plant

Modeling / Simulation

26 14 June 2012

GTI’s Pilot Gasification Test Facility

3.Morphysorb®

-Gas/Liquid Contactor for CO2 & H2S Removal

1.Advanced Gasification Test Facility

-1a Haldor Topsøe TIGAS Process -1b PWR Gasification System -1c Biomass Syngas Conditioning

Systems

2.Flex-Fuel Test Facility

-U-GAS and RENUGAS Gasification Systems

4.SulfaTreat®

-Sorbent-based Sulfur Scavenger

5.High Pressure Oxygen and Nitrogen Supply

1a 1b 1c 2

27 14 June 2012

Pilot Tests for the Application Green Gasoline From Wood Using Fluidized Bed Gasification

and Haldor Topsøe TIGAS Processes > Demonstrate a technology for thermochemical conversion

of woody biomass to gasoline

> 20- and 30-day tests of fully integrated process.

CARBONA/ANDRITZ GASIFICATION

HALDOR TOPSØE TIGAS SYNGAS-TO-GASOLINE

PROCESS

Recycled syngas

BIOMASS

Gas cleanup & treatment

28 14 June 2012

Example of Using Existing Infrastructure to Optimize the Energy Value of Biomass

Issue • Capital-intensive projects improve economics by increasing scale. • Biomass has a low energy density and is disperse. • Need to aggregate large amounts of biomass sustainably.

Option

• Piggy-back – go to the biomass (forest industry). • Use the biomass at maximum conversion efficiency. • Make a fungible product for a vast market. • Use existing infrastructure to get the product into the economy.

29 14 June 2012

Fischer-Tropsch Products from Gasification of Forest Biomass > Sponsored by UPM-Kymmene (CY 2008 - CY 2011)

> Pilot gasification and gas processing at GTI: 15 tpd biomass gasification, catalytic reforming

Gasification Plant

Fuel Handling

Fischer-Tropsch

> Forest residues: tops, bark, hog fuel, stumps

> Andritz Carbona partner

> Commercial sites for 300 MWth scale in Finland and France selected

UPM Mill

30 14 June 2012

• Sustainably managed forests

• Existing supply infrastructure

• High conversion efficiency

• Existing distribution infrastructure

• Decarbonize all sectors of economy

• Highest potential end use efficiency

Bio2G: Forest to Renewable Natural Gas

31 14 June 2012

Successful Biomass Gasification Projects are no Accident

• The product

• The feedstock

• The technology

IT ALL MATTERS:

Quantify Risks - Verify Performance - Optimize Design

32 14 June 2012

Questions or Discussion?

Gasification Options for Bioenergy Projects Bush GTI.pdfCO (carbon monoxide) H 2 (hydrogen) CH 4...

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