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Astec Sustainability
Greg Renegar
California Asphalt Paving
Association
2023
Our industry has come a long way…
1912 2023 The Plant of the Future
Innovation Example
Looks similar – not similar due to technology
Innovation Drivers
MIX DEMAND, ECONOMICS, MIX DESIGN, REGULATION, COMPETITION
CREATES NEED
AVAILABLE TECHNOLOGY
ADAPT, INNOVATE
New “recipe”
8.1%, AC Power
90.3%, Drum/Dryer Burner 1.4%, Hot Oil
Burner
0.17%, Agg
Loader Ops
Asphalt Plant Carbon Footprint
EPD Data from NAPA’s 2022 “GHG Emissions Inventory for Asphalt Mix Production in the United States”
Plant Carbon Footprint data from Astec proprietary calculations. Third party verification in progress.
52%, A1
(Upstream
Manufacturing)
5%, A2 (Material
Transportation)
43%, A3 (Plant
Operations)
Just the facts
• 94% of roads are asphalt – importance of industry
• 300F HMA requires energy (approximately 250,000
BTU/hr)
• Recycled Asphalt Pavement (RAP) is the USA’s most
recycled material – 22% average -opportunity
• Current plant technology can produce mix with 50%
to 70% RAP - capability
• Many things can be done now to lower the energy
requirements (component & operation efficiency)
Asphalt plant current technology
• Ultra-low NOx burner technology
developed for California
requirements
Existing Technology: Burners
Switching from Waste Oil to Natural
Gas can lead to a 29%* reduction
in carbon emissions.
*Based on Astec internal calculations. Third party verification in progress.
Astec has tested a hydrogen-enriched natural
gas fuel train up to 30% hydrogen.
30% Hydrogen results in a 12% reduction in
CO2 with a slight increase in NOx.
Asphalt plant current technology
• Variable frequency drive (VFD) Dryer technology
– further reduces heat loss
• 60F stack = 10% production rate change
• 60F stack = 4% fuel change
• Safety – drum flight changing
• 250 tph to 300 tph
VFD – Variable Speed Drives
What are they good for?
• Energy savings:
▪ Baghouse exhaust fan (80% speed = 50% energy)
▪ Burner fan (50% speed = 12.5% energy)
▪ Much less noise – less worker stress – happier neighbors
What can be done NOW
• Go Electric
• AC tanks
• Hot oil heater
• AC piping
• Plant component heat
• Drag slat conveyor
• Silo cone heat
• Traverse slat conveyors
What about Electrification?
Where is the dryer?
400 TPH ( MM BTU burner) is
equivalent to 39,300 hp
We aren’t there yet
What can be done NOW
• Insulate everything that gets hot - almost
Thermal image of an aggregate dryer
Insulate or not?
What can be done NOW
• Utilize storage silos to keep plant running efficiently
• Minimize waste
• Maximize quality
What can be done NOW
• Use as much RAP as possible – do it the right way
• Fractionate
• Best practice if don’t fractionate
• Equipment – training – mix design
What can be done NOW
• CCPR (Cold Central Plant Recycling) – no heat req’d
• What is it?
• 97% RAP Product
• 2% Water – compaction aid
• 2% cement
• RAP + AC spot welds + water= CCPR
• What is it good for?
• Base
• Binder
• Rock base substitute
What can be done NOW
• WMA (warm mix asphalt)
• Just do it
Who is in charge?
CONVENTIONAL
HOT MIX
WARM MIX
50F lower mix temperature = 11% less fuel
Pick a WMA technology and sell it
Existing Technology: Operations
Good stockpile management
practices can have an
oversized effect on plant
output and mix cost.
A 2% reduction in moisture
can reduce the burner energy
requirement by 21%*.
*Based on Astec internal calculations. Third party verification in progress.
Scenario 1
Baseline with #2 Fuel Oil
Scenario 2
Baseline with NG
Scenario 3
Stockpile Management, 50% Warm Mix
Scenario 4
Stockpile Management, 100% Warm Mix,
20% H2 fuel enrichment
lbs
CO2e
per
ton
of
asphalt
mix
A1 (Upstream Manufacturing) A2 (Material Transportation) A3: AC Power A3: Drum / Dryer Burner A3: Hot Oil Burner A3: Agg Loader Ops
How things add up
*Stockpile Management = 2% Moisture Reduction
**Warm Mix = 75° F Temperature Reduction
No change to A1, A2, A3: AC Power, A3: Outbound Trucking, or A3: Agg Loader Ops
9%
20% 26%
A3
A2
A1
No.2 fuel Nat gas Nat gas
Pave/slope
Stockpile
50% WMA
Nat gas
Pave/slope
Stockpile
100% WMA
20% H2
What might the future look like?
• Quiet
• No odors or visible hydrocarbon emissions
• More fuel efficient & less greenhouse gas emissions
• Mostly electric plant components
• Covered facilities
Less Impact… Better Neighbor.
Covered indoor facilities
2023 CalAPA Spring Conference presentation by Astec on the plant of the future
Covered indoor facility, France, 2013
We can safely predict…
Questions?

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2023 CalAPA Spring Conference presentation by Astec on the plant of the future

  • 1. Astec Sustainability Greg Renegar California Asphalt Paving Association 2023
  • 2. Our industry has come a long way… 1912 2023 The Plant of the Future
  • 3. Innovation Example Looks similar – not similar due to technology
  • 4. Innovation Drivers MIX DEMAND, ECONOMICS, MIX DESIGN, REGULATION, COMPETITION CREATES NEED AVAILABLE TECHNOLOGY ADAPT, INNOVATE New “recipe”
  • 5. 8.1%, AC Power 90.3%, Drum/Dryer Burner 1.4%, Hot Oil Burner 0.17%, Agg Loader Ops Asphalt Plant Carbon Footprint EPD Data from NAPA’s 2022 “GHG Emissions Inventory for Asphalt Mix Production in the United States” Plant Carbon Footprint data from Astec proprietary calculations. Third party verification in progress. 52%, A1 (Upstream Manufacturing) 5%, A2 (Material Transportation) 43%, A3 (Plant Operations)
  • 6. Just the facts • 94% of roads are asphalt – importance of industry • 300F HMA requires energy (approximately 250,000 BTU/hr) • Recycled Asphalt Pavement (RAP) is the USA’s most recycled material – 22% average -opportunity • Current plant technology can produce mix with 50% to 70% RAP - capability • Many things can be done now to lower the energy requirements (component & operation efficiency)
  • 7. Asphalt plant current technology • Ultra-low NOx burner technology developed for California requirements
  • 8. Existing Technology: Burners Switching from Waste Oil to Natural Gas can lead to a 29%* reduction in carbon emissions. *Based on Astec internal calculations. Third party verification in progress. Astec has tested a hydrogen-enriched natural gas fuel train up to 30% hydrogen. 30% Hydrogen results in a 12% reduction in CO2 with a slight increase in NOx.
  • 9. Asphalt plant current technology • Variable frequency drive (VFD) Dryer technology – further reduces heat loss • 60F stack = 10% production rate change • 60F stack = 4% fuel change • Safety – drum flight changing • 250 tph to 300 tph
  • 10. VFD – Variable Speed Drives What are they good for? • Energy savings: ▪ Baghouse exhaust fan (80% speed = 50% energy) ▪ Burner fan (50% speed = 12.5% energy) ▪ Much less noise – less worker stress – happier neighbors
  • 11. What can be done NOW • Go Electric • AC tanks • Hot oil heater • AC piping • Plant component heat • Drag slat conveyor • Silo cone heat • Traverse slat conveyors
  • 12. What about Electrification? Where is the dryer? 400 TPH ( MM BTU burner) is equivalent to 39,300 hp We aren’t there yet
  • 13. What can be done NOW • Insulate everything that gets hot - almost
  • 14. Thermal image of an aggregate dryer Insulate or not?
  • 15. What can be done NOW • Utilize storage silos to keep plant running efficiently • Minimize waste • Maximize quality
  • 16. What can be done NOW • Use as much RAP as possible – do it the right way • Fractionate • Best practice if don’t fractionate • Equipment – training – mix design
  • 17. What can be done NOW • CCPR (Cold Central Plant Recycling) – no heat req’d • What is it? • 97% RAP Product • 2% Water – compaction aid • 2% cement • RAP + AC spot welds + water= CCPR • What is it good for? • Base • Binder • Rock base substitute
  • 18. What can be done NOW • WMA (warm mix asphalt) • Just do it
  • 19. Who is in charge? CONVENTIONAL HOT MIX WARM MIX 50F lower mix temperature = 11% less fuel Pick a WMA technology and sell it
  • 20. Existing Technology: Operations Good stockpile management practices can have an oversized effect on plant output and mix cost. A 2% reduction in moisture can reduce the burner energy requirement by 21%*. *Based on Astec internal calculations. Third party verification in progress.
  • 21. Scenario 1 Baseline with #2 Fuel Oil Scenario 2 Baseline with NG Scenario 3 Stockpile Management, 50% Warm Mix Scenario 4 Stockpile Management, 100% Warm Mix, 20% H2 fuel enrichment lbs CO2e per ton of asphalt mix A1 (Upstream Manufacturing) A2 (Material Transportation) A3: AC Power A3: Drum / Dryer Burner A3: Hot Oil Burner A3: Agg Loader Ops How things add up *Stockpile Management = 2% Moisture Reduction **Warm Mix = 75° F Temperature Reduction No change to A1, A2, A3: AC Power, A3: Outbound Trucking, or A3: Agg Loader Ops 9% 20% 26% A3 A2 A1 No.2 fuel Nat gas Nat gas Pave/slope Stockpile 50% WMA Nat gas Pave/slope Stockpile 100% WMA 20% H2
  • 22. What might the future look like? • Quiet • No odors or visible hydrocarbon emissions • More fuel efficient & less greenhouse gas emissions • Mostly electric plant components • Covered facilities Less Impact… Better Neighbor.
  • 25. Covered indoor facility, France, 2013
  • 26. We can safely predict…