workshop march 03 and 04 , 2003 ceth hunan section...
TRANSCRIPT
Modern Technologies on Flue Gas CleaningModern Technologies on Flue Gas Cleaning
WORKSHOPMarch 03rd and 04th, 2003
CETHHunan
Section C
Dust Removal SystemsDust Removal Systems
ESP Fabric Filter
Lurgi Lentjes Energie Hamon Rothemühle Cottrell
⇒ Environmental standards
⇒ Economical evaluation
⇒ Maintainability
⇒ Availability
Selection of Dedusting EquipmentSelection of Dedusting Equipment
⇒ Boiler process optimisation
⇒ Mechanical repair works
⇒ Gas flow distribution
⇒ ESP controller / HV supply
⇒ Gas conditioning
⇒ ESP enlargement
⇒ Fabric filter conversion
ESP ImprovementsESP Improvements
Arrangement of dischargeAnd collecting electrodesVARIODYN PS O / ZT 24
Lurgi Lentjes Energie
Electrodes ExampleElectrodes Example
Advanced RigidDischarge Electrodewith Sigma III-Collecting Plate
Hamon Rothemühle Cottrell
Electrodes ExampleElectrodes Example
Dust Removal SystemsDust Removal Systems
ESP Fabric Filter
Lurgi Lentjes Energie Hamon Rothemühle Cottrell
Fabric Filter ConversionFabric Filter Conversion
⇒ Conversion to Fabric Filter requires upgrade of ID-fan due to higher pressure drop
design ductsincreased leakage rates
⇒ Pulse Jet FilterHigh pressure pulse jetLow pressure pulse jet
Pressure[bar]
High pressure - low volume 2.8 - 7.0
Intermediate pressure / volume 1.0 - 2.1
Low pressure - high volume 0.5 - 0.9
Cleaning Cleaning -- Air PressureAir Pressure
Critical for sizingNo influenceDust resistivity
No limitNo limitInlet dust
< 450°CCritical for bag materialTemperature
No limitNo limitFlow rate
ESPFabric Filter
Comparison ESP vs. FFComparison ESP vs. FF
Sensitive - increasing resistivity, particle cohesion and re-entrainment, Corona suppression
Sensitive for very fine particles -> bag penetration
Particle size distribution
Sensitive to resistivity(Conditioning effect)Corrosion
Sensitive for specific fabricsCorrosion and bag blockage
Acid dewpoint
Positive sensitive to resistivityConditioning effectBoiler tube leakage
Sensitive below dewpoint
Boiler tube leakage may cause bag blockage
H2O dewpoint
ESPFabric Filter
Comparison ESP vs. FFComparison ESP vs. FF
Relatively highRelatively lowInvestment cost
No specific requirementsReplacement of bagsapp. 1,000 h every 5 years
Maintainability
< 20 - 50 mg/m³<< 10 mg/m³Clean gas dust
0.2 - 1.5 kW/(m³/s)1.5 - 3.0 kW/(m³/s)Specific power consumption
< 3 mbar< 15 - 20 mbarPressure drop
ESPFabric Filter
Comparison ESP vs. FFComparison ESP vs. FF
operation peak Acid AlkaliPolyesterPE
mining, cement, metallurgy,wood, ceramics, asbestos 140 150 1 3 1.0
PolyacrylnitrilPAN
asphalt, lime, gypsum,spray drier 125 140 2 2 1.7
PolypropylenPP food, detergents 90 100 1 1 1.2
PolyphenilsulfidPPS chemical, power generation 180 220 2 2 3.9
Glassfiberwoven melting processes 250 300 2 3 5.4
PolyamidPA
cement, gypsum, ceramics,steel, asphalt 180 220 2 2 4.0
PolyamidPI power generation, cement 260 300 1 3 5.5
PolytetraflourethylenPTFE
waste, sludge, biomass,power stations, chemicals 260 280 1 1 9.4
PriceIndex
Temperature ResistivityMaterial Application
1=very good 2=good 3=poor
Fabric Filter MaterialFabric Filter Material
⇒ Typical Leakage from 10 to 30 % depending on age and maintenanceof system
⇒ Reduction down to 6 - 8 % possible
⇒ Direct Correlation between VolumeFlow and Emission
Air Heater Leakage ReductionAir Heater Leakage Reduction
Wet ScrubbingWet Scrubbing
Two proven systems are available
Desintegratorsare high efficiency precipitators for very fine dusts and extremelylow clean gas dust contents.
Venturi ScrubberAre used predominantly in cases where more favourable conditionsExist for obtaining high collection efficiencies with a justifiable powerRequirement and lower investment costs.
Wet Scrubbing Wet Scrubbing -- Power DemandPower Demand
5 - 15
Rotor Scrubber
even higher
Des-integrator
0.1 - 0.65 - 150.3 - 3.0Energy consumption[kW/(1,000 m³/h)]
Electrostatic Precipitator
Venturi Scrubber
Spray Scrubber
Precipitator Type
Combined Sulphur and Dust RemovalCombined Sulphur and Dust Removal
1. StageRemoval of large dust particles,HCl and HF
2. StageRemoval of SO2 with NaOH
3. StageRemoval of fine dust andaerosols with Ringjet - Venturi
Limited dust inletapp. 100 mg/m³