WORKSHOP March 03 and 04 , 2003 CETH Hunan Section...

Modern Technologies on Flue Gas CleaningModern Technologies on Flue Gas Cleaning

WORKSHOPMarch 03rd and 04th, 2003

CETHHunan

Section C

Flue Gas Path from Boiler to StackFlue Gas Path from Boiler to Stack

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

Current DensitiesCurrent Densities

Z profile

Electrode SystemVARIODYN PS O / ZT24

Lurgi Lentjes Energie

Electrodes ExampleElectrodes Example

Arrangement of dischargeAnd collecting electrodesVARIODYN PS O / ZT 24

Lurgi Lentjes Energie


Advanced RigidDischarge Electrodewith Sigma III-Collecting Plate

Hamon Rothemühle Cottrell


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

Normal operation Cleaning of bags

Pulse Jet Filter CleaningPulse Jet Filter Cleaning

Pulse Jet Filter CleaningPulse Jet Filter Cleaning

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


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


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

HP Pulse Jet Filter HP Pulse Jet Filter -- ExampleExample

LP Pulse Jet Filter LP Pulse Jet Filter -- ExampleExample

⇒ 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

Ringjet VenturiDust and aerosolseparation

Venturi Venturi ScrubberScrubber

This presentation was kindly supported with graphics,photos, tables and other information by:

WORKSHOP March 03 and 04 , 2003 CETH Hunan Section...

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