conversion of electrostatic precipitator technical... · gas path in the esp is horizontal, while...
TRANSCRIPT
CONVERSION OFELECTROSTATIC PRECIPITATOR
by Alberto Pedrinoni
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1. WHY CHANGE
3. DESIGN
2. FIRST APPROACH
4. PERFORMANCES
5. BOLDROCCHI GROUP
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1. WHY CHANGE
NEW EMISSION LEVELS
NEW OPERATING CONDITIONS
COMBINATION OF BOTH
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REQUIREMENTS:
1. WHY CHANGE
2. FIRST APPROACH
4. PERFORMANCES
5. BOLDROCCHI GROUP
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3. DESIGN
2. FIRST APPROACH
OPERATING PARAMETERS- GAS FLOW- PRESSURE PROFILES- TEMPERATURES (HYSTORICAL)
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INFLUENCE ON THE DESIGN:
KILN SHUT DOWN PERIOD
SPECIAL REQUIREMENTS- ON LINE MAINTENANCE
ESP REINFORCEMENTS
2. FIRST APPROACH
INLET / OUTLET DUCTS- VELOCITIES- FRESH AIR VALVE- AXIAL FAN (IF REQ.)
CHECK LIST
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GAS COOLING
DUST TRANSPORT
FILTRATION AREA
EXISTING FAN
1. WHY CHANGE
3. DESIGN
2. FIRST APPROACH
4. PERFORMANCES
5. BOLDROCCHI GROUP
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3. DESIGN
BAG FILTER DESIGN
NO PEAKS OF GAS AND DUST
IMMACULATE GAS DISTRIBUTION
TAILOR MADE DESIGN
EQUAL OPERATION OF EACH PART OF THE BAG FILTER
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3. DESIGN
Gas path in the ESP is horizontal, while in the bag filter a part of the gasmust be driven from bottom to the top to reach the bags with the correctcan velocity.
Existing screens efficacy must be tested.
A Computational Fluid Dynamic analysis is mandatory to be sure distribution system drives gas correctly.
Once obtained homogeneous distribution at casing inlet level, gas flux must be divided: a part horizontally, a part feed bags from the bottom
vertical velocity between the bags is reduced, with positive influence on filter performance.
To get this aim, baffles are installed to protect the bags and to allow partial horizontal gas flow
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3. DESIGN
Others perforated plates or distribution devices are generally needed – at the level of the hoppers - to feed uniformly all the bags installed inside the filter and get uniform filtering velocity.
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3. DESIGN
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Application Fabric Treatment Max Temperature
Kiln and Raw Mill PPS PTFE coating 200P84 PTFE coating 210Fiberglass PTFE membrane 260
Clinker cooler Polyester --- 140Aramyd --- 220Fiberglass PTFE membrane 260
Cement / Slag Mill Polyester PTFE coating 140Acrylic PTFE coating 120Polyester/Acrylic PTFE coating 120
FABRIC CHOICE
3. DESIGN
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3. DESIGN
FAN DESIGNUPGRADE OF THE EXISTING FAN
- CHEAPER- FASTER
NEW FAN- HIGHER PERFORMANCES- BEST EFFICIENCY
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3. DESIGN
FAN UPGRADE
COMPLETE ROTATING PART REPLACEMENT
IMPELLER MODIFICATION
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3. DESIGN
Foundations Ducts Instrumentation (if available) Shut down time
ADVANTAGES
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3. DESIGN
Reducing fans power consumption:Tailor made design to maximize the performancesUtilization of airfoil blades
NEW FAN
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3. DESIGN
Spinning of inlet cone and shroud to be rolled and profiled to obtain an uniform and laminar flow and the venturi effect
Machined inlet rotor ring to reduce the gap between inlet bell and impeller
Increase of the fan efficiency
1. WHY CHANGE
2. FIRST APPROACH
4. PERFORMANCES
5. BOLDROCCHI GROUP
www.boldrocchi.eu
3. DESIGN
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4. PERFORMANCES
Location: Czech RepublicApplication: Kiln and Raw Mill
Bag FilterGas Flow: 390.000 m3/hTemperature: 170 °C Filtration area: 7.383 m2
Bags: 6.500 mm lengthPPS with PTFE coating
FanGas Flow: 460.400 m3/hPressure rise: -50 mbarInlet type: DoubleBlades: Airfoil typeMotor installed: 630 kW – 6 poles
DEDUSTING SYSTEM DESIGN
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4. PERFORMANCES
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4. PERFORMANCES
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4. PERFORMANCES
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4. PERFORMANCES
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4. PERFORMANCES
The test was executed 2 months after start up, with the following results:
Parameter Guaranteed MeasuredDust emission < 10 mg/Nm3 0,3 mg/Nm3
Pressure drop < 12 mbar < 7 mbarFan power consumption < 200 kW 143 kW
DEDUSTING SYSTEM RESULTS
1. WHY CHANGE
2. FIRST APPROACH
4. PERFORMANCES
5. BOLDROCCHI GROUP
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3. DESIGN
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Worldwide presence
More than 400 employees in 6 locations
Group turnover of 150 mio Euro
100 years of continuous activity
Tailor made design to achieve the best performances
In-house know how for the complete gas handling system
Head quarter factory located in Biassono - Italy
5. BOLDROCCHI GROUP
HEAVY DUTY FANS
AIR POLLUTION CONTROL
INDUSTRIAL NOISE
PROTECTION
HEAT EXCHANGE
HEAVY DUTY DAMPERS
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5. BOLDROCCHI GROUP
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5. BOLDROCCHI GROUP
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THANKS FOR YOUR ATTENTION