Dust, Water and CoalThe Good News and The Bad News

Daniel Marshall10/6/15

Agenda

• The Problem (Dust Generation)• The Test• The Results• The Take-aways

The Problem

The Problem

The Test

The Test

The Results

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%0.00%

0.20%

0.40%

0.60%

0.80%

1.00%

1.20%

1.40%

1.60%

1.80%

2.00%

Dust Produced at Different Moisture Contents (Hennepin)

Moisture Added (%)

Perc

ent o

f Coa

l Los

t as D

ust (

%)

The Results

The Results

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%0.00%

0.20%

0.40%

0.60%

0.80%

1.00%

1.20%

1.40%

1.60%

1.80%

2.00%

Dust Produced at Different Moisture Contents (Hennepin)

Moisture Added (%)

Perc

ent o

f Coa

l Los

t as D

ust (

%)

Things of note…

Region of no effect

Region of no effect

The Results

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%0.00%

0.20%

0.40%

0.60%

0.80%

1.00%

1.20%

1.40%

1.60%

1.80%

2.00%

Dust Produced at Different Moisture Contents (Hennepin)

Moisture Added (%)

Perc

ent o

f Coa

l Los

t as D

ust (

%)

Things of note…

As-receivedMoisture content

The Take-Aways

• In coal, dust = $

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%$0.00

$10.00

$20.00

$30.00

$40.00

$50.00

$60.00

$70.00

$80.00

$90.00

Dust Produced at Different Moisture Contents (Hennepin)

Moisture Content (%)

Cost

of C

oal L

ost a

s Dus

t($/

hr)

The Take-Aways

• In coal, moisture = $

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%$0.00

$50.00

$100.00

$150.00

$200.00

$250.00

Thermal Penalty (Hennepin)

Moisture Content (%)

Cost

of T

herm

al P

enal

ty ($

/hr)

The Take-Aways

• You must find the balance

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%$0.00

$50.00

$100.00

$150.00

$200.00

$250.00

Comparison of Coal Lost to Thermal Penalty (Hennepin)

Lost Material Dollars ($/hr) Thermal Penalty Dollars ($/hr)

Moisture Content (%)

Coal

cost

($/h

our)

The Take-Aways• Change the way it loads, produce

less dust

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%$0.00

$50.00

$100.00

$150.00

$200.00

$250.00

Thermal Penalty (Hennepin)

Moisture Content (%)

Cost

of T

herm

al P

enal

ty ($

/hr)

The Take-Aways• Add a surfactant, can prevent

dust, but use less water

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%$0.00

$50.00

$100.00

$150.00

$200.00

$250.00

Thermal Penalty (Hennepin)

Moisture Content (%)

Cost

of T

herm

al P

enal

ty ($

/hr)

Agenda

• The Problem (Dust Generation)• The Test• The Results• The Take-aways

Questions

Questions?

Questions?

Questions?