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DSI Options for MATS Compliance
Pat MongovenARIPPA Aug 2013
Mississippi Lime – Confidential Information
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MATS Acid Gas RequirementsSO2 < 0.2 lbs/MMBtu or HCl < 0.002 lbs/MMBtu
Can you meet MATSwith just more stone?
What other options doyou 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)?
Mississippi Lime – Confidential Information
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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)
Mississippi Lime – Confidential Information
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Furnace Sorbent Injection location For SO2 Capture
Coal Feed
Hydrate Feed
Mississippi Lime – Confidential Information
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MATS Target
SO2
lbs/
MM
Btu
Lbs/hr Hydrate
Test Data 4/2013
Mississippi Lime – Confidential Information
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CFB Test Data 8/14/2013
0.15 lbs/MMBtu
FSI Started
0.35 lbs/MMBtu
108 MW’s1,500 lbs/hr hydrate27,000 lbs/hr stone
Mississippi Lime – Confidential Information
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CFB Boiler – Burner Injection location For SO2 Capture
Why does hydrate & stone work better than stone alone ??
StoneCaCO3
SO2LimeCaO
GypsumCaSO4
HEAT+
Mississippi Lime – Confidential Information
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CFB Boiler – Burner Injection location For SO2 Capture
Why does hydrate & Stone work better than stone alone ??
StoneCaCO3
GypsumCaSO4
HEAT
HydrateCa(OH)2
HEAT
+
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
SO2LimeCaO
GypsumCaSO4
+VE
RY h
igh
surf
ace
area
CaO
VERY
hig
h su
rfac
e
area
CaO
LimeCaO SO2
StoneCaCO3
HEAT+ LimeCaO
Mississippi Lime – Confidential Information
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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 ??
Mississippi Lime – Confidential Information
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CFB Boiler – Burner Injection location For SO2 Capture
Why does hydrate & Stone work better than stone alone ??
Mississippi Lime – Confidential Information
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CFB Boiler - Baghouse Inlet injection location For HCl Capture
Temperature~ 3500 F
Hydrate Feed
Mississippi Lime – Confidential Information
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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
Mississippi Lime – Confidential Information
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Full Scale CFB for HCl (2012 – just redone& awaiting lab results)
(If you’d like an updatewhen the lab work iscompleted, just leaveme a business card)
Mississippi Lime – Confidential Information
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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
Mississippi Lime – Confidential Information
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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.
Mississippi Lime – Confidential Information
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Questions
Questions – please stop by booth 14
Pat MongovenBusiness Development Manager – [email protected]
Mississippi Lime Company3870 S. Lindbergh Blvd.Suite 200St. Louis, MO 63127www.mississippilime.com
