Coal USA Coal Dust Mitigation Update Coal Dust Mitigation Update - - PowerPoint PPT Presentation

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Coal USA Coal Dust Mitigation Update Coal Dust Mitigation Update

Surface Transportation Board – RETAC September 10, 2009

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Rain Impact on Ballast Contaminated w ith Coal Dust

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Undercutter Work – Normal Ballast is not Black

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N

4 3 1 5 2

Service Road Service Road

Schematic of Typical BNSF/UP Dustfall Schematic of Typical BNSF/UP Dustfall Collector Orin Subdivision Site Collector Orin Subdivision Site

12’ 12’ 35’ 60’ 60’

Eastern Track Western Track

Note: Distances from centerline

• f track will vary

slightly due to site geography

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Dustfall Collectors

Measure amount of dust deposited in the railroad right-

• f-way

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Trackside Monitor (TSM)

Propeller Anemometer Temperature/ Relative Humidity Sensor Data Logger Precipitation Gauge Dust Monitor Dustfall Collector MP 90.7 TSM

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Trackside Monitors

Measures dust emission of each passing train Locations: MP 90.7 on Orin Sub Towers on East and West sides of tracks Approximately 50% of trains useable MP 558.2 on Black Hills Sub Towers on North and South sides of tracks Approximately 75% of trains useable

MP 693.4 on Big Horn Sub Data collection only at this time

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Post-Processing Post-Processing of

• f Train

Train Data

Data

Train Removal Criteria for Compliance Analysis Additional train (loaded or empty) passing TSM

site within 6 minutes

High/Erratic background dust Bin data into proper wind components e.g., East dust monitor uses data with westerly

wind component

e.g., West dust monitor uses data with easterly

wind component

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Dust Values for Passing Train at TrackSide Monitor

20 40 60 80 100 120

• 60

60 120 180 240 300 Time (Seconds) Dust Value

Train Passage at MP 90.5 According to BNSF Train Data

Coal Dust Train Measurement Coal Dust Train Measurement

Train arrives at MP 90.7

Environmental Background Dust

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Dust Values for Passing Train at TrackSide Monitor

20 40 60 80 100 120

• 60

60 120 180 240 300 Time (Seconds) Dust Value

Dust Value Threshold = 10 + Background Average

Front Diesel: Ignore first 30 seconds of values once dust signal exceeds threshold Rear Diesel: Ignore last 15 seconds of dust signal > threshold Integrated Dust Value Version 2 = 412 Train Passage at MP 90.5 According to BNSF Train Data Environmental Background Dust

Train arrives at MP 90.7

Integrated Dust Value (IDV.2) Integrated Dust Value (IDV.2)

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Normal Chute 5 ft. wide Promotes center peaked load Allows loading heights 3’ to 4 ‘ above sill

Improved Loading Profile

Redesigned Chute Flared to 7 ft. wide Same height as normal chute Promotes bread loaf shape Limits height chute can be raised

Improved Loading Profile

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BEFORE Note Peaked Loads, Sharp Lines, Steep Angle of Repose and other irregular surfaces which are susceptible to erosion AFTER Note Rounded Contour, No Sharp Angles, Flatter Angle of Repose and few irregular surfaces which are susceptible to erosion

Impact of Modified Chutes

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Field Profile Audits

Monthly unannounced audits Trains found not in compliance, provide mines Written report Photograph Video of train Audited 225 trains year to date

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RTEPS and Passive Collectors

RTEPS typically applied on last car of train with Passive Collector to determine external forcings (Wind

Speed/Direction, Precipitation, Ambient Temp/RH, Coal Surface Temp, and Airborne Dust)

Passive Collectors applied in sets of 5 – 10 to test effectiveness of dust suppression method compared to control technique

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Instrumentation

Rail Transit Emission

Profiling System (RTEPS)

Airborne Dust Monitor Precipitation Gauge Ambient

Temperature/Relative Humidity Sensor

Propeller Anemometer Infrared Sensor for Coal

Surface Temperature

Global Positioning System

Passive Dust Collector

(PC)

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Nacco Bridge – Undercut 2006

Coal has filtered down to the top of the bridge deck