E E - - STR STR TM TM Technology Development Technology Development for for Lignite Gasification Lignite Gasification Albert Tsang, E-Gas Technology Director Cliff Keeler, E-Gas Product Manager Gasification Technologies Conference Washington, D.C. November 3, 2010
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EE--STRSTRTMTM Technology DevelopmentTechnology Development for for Lignite GasificationLignite Gasification
Albert Tsang, E-Gas Technology Director Cliff Keeler, E-Gas Product Manager
Gasification Technologies Conference Washington, D.C. November 3, 2010
2
E-STRTM Technology -- Business Objectives
• Provide an economically attractive process for lower rank coals
• Low CAPEX & OPEX
• Operate at pipeline pressure for SNG
• High reliability
3
Gasification Opportunities for Low Rank Coal
4
Syngas
SyngasCooler
Slurry/Gas/Water
O2
Slag
Char
ResidenceVessel
Slurry
Current E-GasTM Gasifier
• Slurry feed with unique two stage design
• Improves conversion efficiency, esp. for reactive fuels
• Dry recycle maintains high conversion for low reactivity fuels
• Allows customization to match the syngas applications
• Flexible slurry / water / gas quench to 2nd stage
• Flexible CH4 concentration
5
E-STR Technology - Basic Concept
• More coal slurry to 2nd stage and less to 1st stage – Reduces O2
consumption– Increases Cold
Gas Efficiency
• Managing tar/liquid production or destruction is key
IMPROVED COLD GAS EFFICIENCY
SLURRY TO SECOND STAGE
COLD
GAS
EFF
ICIE
NCY
REDUCED OXYGEN CONSUMPTION
SLURRY TO SECOND STAGE
OXY
GEN
CO
NSUM
PTIO
N
6
Syngas
Syngas Cooler
O2
Char
Residence Vessel
Char
Slurry
Slag
Syngas
Syngas Cooler
Residence Vessel
O2
Char
Slurry
Slag
Syngas
Syngas Cooler
Residence Vessel
Dry feed 1st stage
Cylindrical for Hi-
pressure
Catalytic tar conversion &
CO shift
E-STR Gasifier Configuration
No syngas cooler
No residence
vessel
Up to 100% slurry to 2nd
stage
Lower temp 2nd stage, 400-
750C
INTERNAL FEEDSTOCK UPGRADER
7
Syngas
O2
CharChar
Slurry
Slag
Syngas
O2
Char
Slurry
Slag
Syngas
E-STR Gasifier Configuration
• Simple Design
• High Efficiency
• High Pressure
8
E-STR Technology Advantages• Reduced CAPEX
– Elimination of Residence Vessel and Syngas Cooler– Up to 40% smaller ASU from dry feeding 1st stage– Up to 20% smaller downstream systems due to higher syngas
and methane yield from gasifier– Low cost slurry-based feed system; dry solid recycle to 1st stage