Paradise Scrubbe

Paradise Scrubbe

 All 3 scrubbers are Wet Limestone 

All 3 scrubbers are Wet Limestone 

Desulfurization Desulfurization Systems with Force

Systems with Force

 Unit 1 and 2 scrubbers are identica

Unit 1 and 2 scrubbers are identica

built in the early 1980 built in the early 1980’s

 Unit 3 scrubber was finished in 200

Unit 3 scrubber was finished in 200

built as a result of CAA 1990 regula

built as a result of CAA 1990 regula

 Units 1 and 2 produce gypsum/ash 

Units 1 and 2 produce gypsum/ash 

produces a gypsum slurry produces a gypsum slurry

 All slurry pumped to gypsum pond All slurry pumped to gypsum pond
Paradise Scrubbers Paradise Scrubbers

Unit 1 and 2 Unit 1 and 2

 6 venturi venturi absorbers (VA) absorbers (VA) with 6 recycle tanks with 6 recycle tanks Open spray towers (3 Open spray towers (3 levels) levels) Vertical ME Vertical ME’s Oxidizing air headers Oxidizing air headers Side

-mounted/Top mounted/Top-mounted agitators mounted agitators

 ID fans downstream ID fans downstream Removes ash Removes ash RE U1 86%, U2 84% RE U1 86%, U2 84%

U

 Double co

Double co

spray (DC

spray (DC

 Cocurrent Cocurrent 

countercu

countercu

1 common 

1 common 

 Horizonta

Horizonta

 Air rotary Air rotary 

mixing and 

mixing an

 Booster fa

Booster fa

of ID fans 

of ID fans 

of module of module

 RE 97.6% 

RE 97.6% 
Scrubber

Chemistry

Venturi Absorber
Unit 1/2 Scrubber Flow Diagram
Gas Path Through U1/2 Scrubbers 

North
Gas Path Through U1/2 Scrubbers Looking Towa

North
Unit 3 Scrubber Flow Diagram
Scrubber Operation Scrubber Operation

 Control pH (U1 and U2: 5.8, U3: 5.8 Control pH (U1 and U2: 5.8, U3: 5.8 –6.0 

6.0 

control mode) control mode)

 Control density(U1 and U2: 7% Control density(U1 and U2: 7% -12% so

12% so

solids) solids)

 Control oxidizing air Control oxidizing air Wash mist eliminators Wash mist eliminators Maintain water balance Maintain water balance Keep flows up in all slurry piping to avoid Keep flows up in all slurry piping to avoid  Flush equipment after shutdown to avoid Flush equipment after shutdown to avoid  Maintain tank levels Maintain tank levels On U1/U2 wash ID fans On U1/U2 wash ID fans
Scrubber Maintenan

Scrubber Maintenan

 Cleaning Cleaning Packing leaks Packing leaks –pumps, sidemounted sidemounted agi

ag

 Pump, Ox air blower and agitator repair a

Pump, Ox air blower and agitator repair a

 Valve repair/replacement Valve repair/replacement Piping repair/replacement Piping repair/replacement –rubber lined 

rubber lined 

 Tank and Duct repair Tank and Duct repair Tank repair Tank repair ME repair ME repair Tangential and spray nozzle replacement Tangential and spray nozzle replacemen Internal slurry and oxidizing air header re

Internal slurry and oxidizing air header re

 Gear box repair/replacement Gear box repair/replacement


Ball Mill Operation Ball Mill Operation

 Control density Control density Maintain water balance Maintain water balance Keep flows up in all slurry pipin

Keep flows up in all slurry pipin

hydrocyclones hydrocyclones to avoid to avoid pluggag

pluggag

 Flush equipment after shutdow

Flush equipment after shutdow

pluggage pluggage

 Maintain tank levels Maintain tank levels
Ball Mill Maintenanc

Ball Mill Maintenanc

 Cleaning Cleaning Packing leaks Packing leaks –pumps Pump repair/replacement Pump repair/replacement Valve rebuild/replacement Valve rebuild/replacement Piping repair/replacement Piping repair/replacement  Agitator repair/replacement Agitator repair/replacement Tank repair Tank repair Gear box repair/replacement Gear box repair/replacement
The End The End