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Carbon Neutral Energy from Waste Gasification. Presented by Allen Medearis and Trip Dacus April 14, 2010 University of Tennessee at Chattanooga. Outline. Gasification UTC Natural Gas Replacement Design -Background -Material and Energy Balance -Cost Analysis -Conclusions

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carbon neutral energy from waste gasification

Carbon Neutral Energy from Waste Gasification

Presented by

Allen Medearis and Trip Dacus

April 14, 2010

University of Tennessee at Chattanooga

outline
Outline

Gasification

UTC Natural Gas Replacement Design

-Background-Material and Energy Balance-Cost Analysis -Conclusions

Garbage Gasification Design-Basis

-ChemCAD

-Material Balance

-Power Production

-Economic Analysis

-Conclusion

gasification
Gasification

Extracting Energy From Organic Materials

Converts Carbonaceous Materials Into Carbon Monoxide and Hydrogen

Uses High Temperatures (>700°C) and Controlled Oxygen Content

Result is Syngas

replacing utc s natural gas usage
Replacing UTC’s Natural Gas Usage
  • Use Wood and Paper
  • Gasify to Make Fuel to Use in Furnaces
  • Replace UTC’s Natural Gas Usage +20% with Syngas
  • Assumptions -Wood and Paper Are Viewed as Cellulose- Syngas Can Be Sufficiently Burned to Power

the Furnaces

material and energy balance results replacing 120 of natural gas usage
Material and Energy Balance ResultsReplacing 120% of Natural Gas Usage
  • Material Composition of Feed

- 70% Cellulose

- 20% Water

- 10 % Ash

  • Feed Stream: 22.7 Tons/Day of Wood and Paper
  • Exit Stream: 17 Tons/Day of Syngas
cost analysis
Cost Analysis

Capital Costs-Grinder $60,000-Cleaner $350,000-Gasifier $330,000

Lang Factor (3.63)

Labor Cost $300,000/year

Annual Power Cost $10,000/year

cost analysis cont d
Cost Analysis (cont’d)

Total Capital Cost: $2.7 Million

Time to Payoff: 3.6 Years

Total Savings Per Year: $770,000

conclusions about utc design
Conclusions About UTC Design

Great Way for University to Save Money

Fast Payoff

Reduces Carbon Footprint of University

Recommend University Fund Further Research

outline1
Outline

Gasification

UTC Natural Gas Replacement Design

-Background-Material and Energy Balances

-Cost Analysis -Conclusions

Garbage Gasification Design-Basis

-ChemCAD

-Material Balance

-Power Production

-Economic Analysis

-Conclusion

introduction
Introduction
  • Gasify Chattanooga Waste for Production of Syngas
  • Burn Syngas in Combined Cycle Gas Turbine for Power Production
basis assumptions
Basis - Assumptions
  • 4.4 lbs of trash per person per day
  • Chattanooga population - 300,000
  • Use existing trash collection infrastructure
basis
Basis

Chattanooga Trash Output –

660 tons/day of trash

plant design schematic
Plant Design Schematic

Combustion Turbine

Air

Filter

Waste

Power

Gasifier

Ash/Slag

Grinder

Exhaust

Air

Power

Steam Turbine

Condenser

material balance
Material Balance

CO2

840 tons/day

Waste,

660 tons/day

H2O

690 tons/day

RPM Gasifier System

Air,

3100 tons/day

Ash/Slag

65 tons/day

capital cost analysis
Capital Cost Analysis

Capital Cost of the Plant = $27M per year

capital cost analysis1
Capital Cost Analysis

CTM – Capital cost of the plant

Cp,i – Purchased cost for major equipment units

FLang – Lang Factor (3.63 for solid-fluid processing)

Total Capital Cost = $120 M

economic analysis
Economic Analysis
  • Income (per year) CHANGE
    • 74MW sold at $0.05 per kW·hr = $31M
  • Expenses (per year)
    • 10% of electricity for plant usage = $3M
    • 10 employees at $100,000 per year = $1M

Net Income = $27M per year

cash flow diagram
Cash Flow Diagram

4 ¼ Years to pay off capital investment

recommendation
Recommendation

Based on this design, we recommend that the city should fund a detailed design study

slide23
Thank you for listening!

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