HOT MIX ASPHALT PRODUTION

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HOT MIX ASPHALT PRODUTION

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Road Pavement Forum: 10th April 2006 Chris Lange PMP, Pr.Tech.(Eng) Director (Technical) Much Asphalt (Pty) Ltd         Plant types and basic components Plant calibration Dust extraction Filler handling and control Aggregate heating Procurement / handling of raw materials Finished product storage Delivery Exhaust Fan Filter Baghouse Primary dust collector Hot Storage Bins HMA made continuously and sent to storage silos Bitumen Tanks Scalping screen to remove oversize aggregate Belt scale Drying and mixing drum Cold Feed Bins TWIN DRUM PLANT : COUNTER-FLOW RAP Feed Plant filler storage and feed Filter Baghouse Finished product storage Coating & mixing drum Aggregate feed Drying & heating Drum Parallel-Flow Drummixer Zones Air Combustion Heating Drying Mixing BIT Hot Mix Asphalt Counter-Flow Drummixer Zones Air Mixing Combustion Heating Hot Mix Asphalt Bitumen Drying Aggregate Counter-Flow Batch Plant Dryer Zones Combustion Heating Drying Air Aggregate Hot Aggregate Plant Automation – Operating System Graphics Binder Content Voids in Mix Filler Content Plant Mixing Tower Skip Bucket Winch The End [...]...Batch Plant Elements Primary Filter Baghouse collector Batch/Mixing tower Hot Storage silos Bitumen storage tanks r e y Dr um Dr Cold feed bins RAP Feed Aggregate to screens Screens size aggregate Hot aggregate travels up bucket elevator Aggregate weigh hopper Pugmill Aggregate from dryer Bitumen weigh pot Hot mix asphalt dispensed into truck / hot- bin Aggregate and bitumen weigh hoppers Bitumen Weighhopper... Valve Air Gas flow Optional knock down plate Bitumen Fines mix with hot mix asphalt Exhaust fan Exhaust fan Manifold Dust screw Manifold Dust screw Automatic Damper Controls Hot Elevator Cyclone feeding fines directly back Batch tower   Remove particulate matter – Primary – Secondary Return fines to the mix – Affects void content – Affects mix stiffness – Difficult to control

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Mục lục

  • Chú ý phần note ở phía dưới mỗi slide

  • Hot Mix Asphalt Production

  • Hot Mix Asphalt Production

  • Drum Mix Plant - Conventional

  • Slide 5

  • Old Drum Mix Mix Plant:

  • Twin Drum Plant

  • Slide 8

  • Slide 9

  • Slide 10

  • Slide 11

  • Slide 12

  • Slide 13

  • Aggregate Hot Bins

  • Slide 15

  • Belt Scale Calibration

  • Slide 17

  • “Graphing the Feeders”

  • Tachometer Mounted on Tail Pulley of Cold Feed Bin Belt

  • “No Flow” Paddle at Feeder Discharge

  • Slide 21

  • Slide 22

  • Slide 23

  • Fuel Reticulation and Heating System

  • Slide 25

  • Slide 26

  • Primary and Secondary Emission Control

  • Primary Collector: Cyclone

  • Multi-Tube Collector

  • Discharge Housing Functions as a Knockout Box

  • Cutaway Section of a Typical Baghouse

  • Pulse Jet Baghouse

  • Slide 33

  • Cyclone, Screw Collector, and Hot Elevator

  • Filler Weigh-Pod After Surge Silo

  • Emission Control Summary

  • Batch plant filtration

  • Aggregate storage

  • Aggregate Storage

  • Bitumen Storage

  • Old Style Operating Cabin

  • Plant automation: Modern control cabin:

  • Plant automation

  • Roodepoort Op Screen

  • Batch Plant Schematic

  • Batch Plant Op Screen

  • Laboratory from the past

  • Modern Asphalt Laboratory

  • Quality Control Trends Monitored

  • Slide 50

  • Slat Conveyor Feeding Storage Silos

  • Hot Storage – Skip and Winch System

  • Storage Silo: 165 t Capacity

  • Correct Loading Sequence

  • The good old days

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