DSI Options for MATS
Compliance
Pat Mongoven
ARIPPA Aug 2013
MATS Acid Gas Requirements
SO2 < 0.2 lbs/MMBtu or HCl < 0.002 lbs/MMBtu
Can you meet MATS
with just more stone?
What other
options do
you have?
If so – what will it cost?
– Stone Cost?
– Fuel Cost to Calcine?
– Can you get the additional stone/fuel
out of the bed fast enough?
– O & M Costs (more handling, grinding, etc)?
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Mississippi Lime – Confidential Information
CFB Boiler – General Schematic
hydrate injection locations
•
•
•
•
•
110 MW’s Foster Wheeler
Waste coal fuel
Limestone in boiler with coal
Tubular Airheater
Baghouse for particulate
collection
• No FGD
• Injection locations
• Prior to Airheater
• Coal feeders - SO2 (FSI)
• Baghouse inlet - HCl (DSI)
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Mississippi Lime – Confidential Information
Furnace Sorbent Injection location For SO2 Capture
Hydrate Feed
Coal Feed
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Mississippi Lime – Confidential Information
SO2 lbs/MM Btu
Test Data 4/2013
MATS Target
Lbs/hr Hydrate
Mississippi Lime – Confidential Information
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CFB Test Data 8/14/2013
108 MW’s
1,500 lbs/hr hydrate
27,000 lbs/hr stone
FSI Started
0.35 lbs/MMBtu
0.15 lbs/MMBtu
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Mississippi Lime – Confidential Information
CFB Boiler – Burner Injection location For SO2 Capture
Why does hydrate & stone work better than stone alone ??
Stone
CaCO3
+
HEAT
Lime
CaO
SO2
Gypsum
CaSO4
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Mississippi Lime – Confidential Information
CFB Boiler – Burner Injection location For SO2 Capture
Why does hydrate & Stone work better than stone alone ??
Stone
CaCO3
+
HEAT
Lime
CaO
SO2
Gypsum
CaSO4
Lime
CaO
Stone
CaCO3
+
HEAT
Lime
Lime
CaO
CaO
Lime
CaO
Lime
CaO
Hydrate
Ca(OH)2
Lime
+ HEAT
CaO
Lime
CaO
Lime
CaO
Lime
CaO
Lime
CaO
Lime
CaO
Mississippi Lime – Confidential Information
SO2
SO2
SO2
SO2
SO2
SO2
SO2
SO2
SO2
SO2
Gypsum
CaSO4
Gypsum
CaSO4
Gypsum
CaSO4
Gypsum
CaSO4
Gypsum
CaSO4
Gypsum
CaSO4
Gypsum
CaSO4
Gypsum
CaSO4
Gypsum
CaSO4
Gypsum
CaSO4
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CFB Boiler – Burner Injection location For SO2 Capture
Why does hydrate & Stone work better than stone alone ??
Is a “Steel Curtain”
Or Stone Enough ??
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Mississippi Lime – Confidential Information
CFB Boiler – Burner Injection location For SO2 Capture
Why does hydrate & Stone work better than stone alone ??
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Mississippi Lime – Confidential Information
CFB Boiler - Baghouse Inlet injection location For HCl Capture
Temperature
~ 3500 F
Hydrate Feed
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Mississippi Lime – Confidential Information
HCl Control with Hydrated Lime
• Reactivity (thermodynamic):
– SO3 > SO2 > HF > HCl (thermodynamic)
• Kinetic (collisions) are critical
– Distribution in duct is key to good removal rates
– In flight capture
– Good coating on baghouse bags
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Mississippi Lime – Confidential Information
Full Scale CFB for HCl
(2012 – just redone
& awaiting lab results)
(If you’d like an update
when the lab work is
completed, just leave
me a business card)
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Mississippi Lime – Confidential Information
Hydrated Lime - Recommended System
• Variable speed feed blower
• Use Air-to-air heat exchanger for
temperature control
• Myrlen air sweeps on cone of weigh bin
• Drop Through Rotary Valve
• Hydrate: Air > 0.6 lbs hyd:lb air
– Pickup velocity >3000 ft/min
• Minimal bends; smooth unions
• Piping/Lance diameter > 1.25”
• Capital Costs ~ $1.5 - $2.0MM
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Mississippi Lime – Confidential Information
Waste Coal CFB Summary
• Hydrated lime can achieve MATS compliance in EITHER HCl or
SO2.
• Removal of SO2 was better at the higher furnace temperatures FSI
• Removal of HCl was better at the lower temperature injection
point (pre-bag house) - DSI
• Hydrate did not have any negative effect on Bag House or fly ash.
• Lowest cost MATS compliance – HCl or SO2 ?? Will be plant
specific.
• Mississippi Lime has a production facility in Weirton WV & we’d
be happy to talk with ARIPPA members about future testing to
better understand economics of hydrate feed for MATS
compliance.
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Mississippi Lime – Confidential Information
Questions
Questions – please stop by booth 14
Pat Mongoven
Business Development Manager – FGT
pgmongoven@mississippilime.com
314-378-0010
Mississippi Lime Company
3870 S. Lindbergh Blvd.
Suite 200
St. Louis, MO 63127
www.mississippilime.com
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Mississippi Lime – Confidential Information