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Hot Mix Asphalt Production Chris Lange PMP, Pr.Tech.(Eng) Director (Technical) Much Asphalt (Pty) Ltd Road Pavement Forum: 10 th April 2006 Hot Mix Asphalt Production Plant types and basic components Plant calibration Dust extraction Filler handling and control Aggregate heating

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hot mix asphalt production

Hot Mix Asphalt Production

Chris Lange PMP, Pr.Tech.(Eng)

Director (Technical)

Much Asphalt (Pty) Ltd

Road Pavement Forum: 10th April 2006

hot mix asphalt production2
Hot Mix Asphalt Production
  • Plant types and basic components
  • Plant calibration
  • Dust extraction
  • Filler handling and control
  • Aggregate heating
  • Procurement / handling of raw materials
  • Finished product storage
  • Delivery
drum mix plant conventional

Scalping screen to remove oversize aggregate

Cold Feed Bins

Drum Mix Plant - Conventional

Hot Storage Bins

Exhaust Fan

Filter

Baghouse

Primary

dust

collector

HMA made continuously

and sent to storage silos

Bitumen Tanks

Drying and mixing drum

Belt scale

twin drum plant

Plant filler storage and feed

Twin Drum Plant

RAP Feed

Filter Baghouse

Coating & mixing drum

Aggregate feed

Finished product storage

Drying & heating Drum

slide7

Parallel-Flow Drum-mixer Zones

Combustion

Air

Heating

Drying

Mixing

BIT.

Hot Mix

Asphalt

slide8

Mixing

Combustion

Heating

Drying

Air

Hot Mix

Asphalt

Bitumen

Counter-Flow Drum-mixer Zones

Aggregate

slide9

Counter-Flow Batch Plant Dryer Zones

Combustion

Heating

Drying

Air

Aggregate

Hot Aggregate

slide10

Batch/Mixing tower

Primary

collector

Filter Baghouse

Hot Storage

silos

Batch Plant Elements

Bitumen

storage

tanks

RAP Feed

Dryer Drum

Cold feed bins

slide11

Aggregate to screens

Aggregate

weigh hopper

Bitumen

weigh

pot

Pugmill

Hot mix

asphalt

dispensed

into truck / hot-bin

Aggregate

from dryer

Screens size

aggregate

Hot aggregate travels up bucket elevator

belt scale calibration
Belt Scale Calibration

Cold feed system

Belt scale

Reference scale

fuel reticulation and heating system
Fuel Reticulation and Heating System

HFO Tank

In-line heater

HFO Sampling pt

slide24

Temperature Profile of Counter-Flow Dryer

Heating

Combustion

Drying

800º C

760º C

120º C

400º C

Gases

Aggregates

Aggregate

0º C

150º C

150º C

300º F

100º C

20º C

primary and secondary emission control
Primary and Secondary Emission Control

Primary Dust Collector

Filtered Air

Secondary Dust Collector

Fines collected and returned

Drying Drum

Exhaust Fan

multi tube collector
Multi-Tube Collector

Outlet

tube

Gas inlet

Spin vanes

Inlet

tube

Collector

element

Valve

discharge housing functions as a knockout box
Discharge Housing Functions as a Knockout Box

Air

Gas flow

Optional knock

down plate

Bitumen

Fines mix

with hot mix

asphalt

pulse jet baghouse
Pulse Jet Baghouse

Exhaust fan

Exhaust fan

Manifold

Manifold

Dust screw

Dust screw

cyclone screw collector and hot elevator

Hot Elevator

Cyclone feeding fines directly back

Batch

tower

Cyclone, Screw Collector, and Hot Elevator
emission control summary
Emission Control Summary
  • Remove particulate matter
    • Primary
    • Secondary
  • Return fines to the mix
    • Affects void content
    • Affects mix stiffness
    • Difficult to control
bitumen storage
Bitumen Storage

BITUMEN TANKS – ELECTRICALLY HEATED/

24 HR TEMPERATURE MONITOR AND CONTROL

roodepoort op screen
Roodepoort Op Screen

Plant Automation – Operating System Graphics

quality control trends monitored
Quality Control Trends Monitored

Binder Content

Voids in Mix

Filler Content