Warm Mix Technical Working Group Meeker Equipment s AquaFoam Technology For Warm-Mix Asphalt

Transcription

1 Warm Mix Technical Working Group Meeker Equipment s AquaFoam Technology For Warm-Mix Asphalt May 14, 2009 Respectively Submitted Meeker Equipment, Inc. Bill Garrett Partner 5602 SR 655 Belleville, PA Office: ext 6 Fax:

2 Production Best Practices Aggregate Moisture Critical Keeping moisture out is a great way to start Keep track of temperature drop of material > 20 F from drum discharge to load out can indicate retained moisture

3 Production Best Practices: Keep Materials Dry so Bag House temperatures can be acceptably maintained Temperature across baghouse must remain above dew point (170 F) Insulating the baghouse is a good way to reduce heat loss

4 Best Practices: Burner Optimization at Lower Temperatures Warm Mix Should produce Lower Emissions Nox 4% decrease from HMA VOC 92% increased from HMA CO2 1% decrease from HMA

5 Due to lower Drum Operations temperatures and addition of RAP, buildup on the flights and in the drum can occur more rapidly Frequent starts and stops can be more of a problem with warm mix in cooler temperatures Excessive buildup will affect mix quality

6 Notice the visual difference at lower operating temperatures HMA F AquaFoam F

7 Best Practices: Proper Heat Balance is Critical

8 Best Practices: Methods of determining heat balance NAPA IS-52

9 Best Practices: Burner Adjustments are critical Properly tuned burner Properly sized burner Properly sized combustion zone Proper fuel viscosity-(r.o.c.k.=recycled oil control kit)

10 Maintaining Bag House Inlet Temperatures are critical & Indexing slingers can help RAP is our Friend

11 Maintaining Bag House Inlet Temperatures are critical & Exhaust gas heaters can help

12 Maintaining Bag House Inlet Temperatures are critical & Drum/Dryer VFD can help

13 Handling the Liquid Asphalt at Lower Temperatures may also be an energy saving option Proper Insulation of tanks, pumps, & calibration system are all critical Properly calibrated & controlled metering systems

14 Best Practices: Non-insulated piping & poorly insulated storage, compound issues when producing WMA

15 Best Practices: Benefits of Dryer/Drum Insulation Allows for more even temperature in the bag collector Before After

16 Voids are Created in the Liquid Asphalt with Steam Micro Bubbles, Temporarily changing the Viscosity of the Binder &Creating AquaFoaming

17 Meeker s AquaFoam Drum AquaFoam Water Metering Skid

18 Meeker s AquaFoam Drum

19 MEEKER s AQUAFOAM BATCH Without an Asphalt Injection Pump

20 MEEKER s AQUAFOAM BATCH Without an Asphalt Injection pump

21 BATCH: Flow Diagram & Scale Calibration Heat can be applied to the water system for operation in freezing temperatures

22 MEEKER s AQUAFOAM BATCH Batch with an existing Asphalt Injection Pump System

23 PROD. RATE TPH 400 ASPHALT % 5 RAP % 25 AC TEMP. F 310 DRY AGG. TEMP. F 313 RAP TEMP. F 60 AC PIPE DIA. IN. 3 AGG. VOL. CU. FT./MIN RAP VOL. CU. FT./MIN WARM MIX TEMP. F 250 AC VOL. CU. FT./MIN RAP MOISTURE % 4.8 AC SPEED FT./MIN AGG. MOISTURE % 5.3 Water Water Water Water Vol of AC Expansion Expected Expected % of AC TPH Lbs/Min.Gal/Min. Gal/Min Ratio AC Temp.F MixTemp.F

24 Optimizing HMA Facility for AQUAFOAM WMA Proper insulation: piping, liquid storage, calibration, baghouse, ductwork, dryer/drum Proper flight adjustments for heat balance & utilization. Proper baghouse temperatures (above dew point) Proper moisture removal & control in aggregates Properly tuned burner Proper testing of materials for maximum results Proper injection equipment as specified by the manufacturer

25 Hot mix and Warm mix

26 ?? Questions?? Thank You Warm Mix Technical Working Group Respectively Submitted Meeker Equipment Bill Garrett Partner 5602 SR 655 Belleville, PA Office: ext 6 Fax: Bill@meekerequipment.com