DSI Options for MATS Compliance Pat Mongoven ARIPPA Aug 2013.

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)?

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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)

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Furnace Sorbent Injection location For SO2 Capture

Coal Feed

Hydrate Feed

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MATS Target

SO2

lbs/

MM

Btu

Lbs/hr Hydrate

Test Data 4/2013

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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

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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+

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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 ??

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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

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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

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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)

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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

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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.

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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