An Introduction to Envirotherm GmbH Dedusting Technology Retrofit - - PowerPoint PPT Presentation

An Introduction to Envirotherm GmbH Dedusting Technology

Retrofit ESP into Fabric Filter

2012 05 23

ENVIROTHERM

Target Individual Action Flue Gas Conditioning  Water Conditioning (Evaporation Cooler)  SO3-Conditioning  NH3-Conditioning  Dual Conditioning (SO3/NH3) ESP-Enlargement  Adding of additional field (same height, wider plate spacing)  New internal equipment (same or larger field height)  Discharge electrode adaptation from field to field  Wider plate spacing (improved efficiency at less

• r same installed electrode weight, upgrading
• f T/R-sets usually required)

Fabric Filter Conversion  Conversion to Pulse Jet or Low Pressure Pulse Jet Fabric Filter using existing casing, ducts, etc.  Upgrading of existing ID-fans

Upgrading of existing ESP installations

ENVIROTHERM

Target Individual Action FF Conversion needs  Check of existing static ESP conditions  Consider for casing statics the new operational data (as pressure difference, temperature)  Consider the flow situation (Inlet and outlet)  Calculation of cloth area needed Advantages  cost advantage  reaching of lower emission values  good performance of FF regardless the ash properties / ash resistivity

Retrofit ESP into FF

ENVIROTHERM

Project Retrofit Fynsværket 1 x 350 MW Coal Fired Boiler Low Pressure Pulse Jet Fabric Filter Client Elsam Fynsværket Location Odense, Denmark Completion December 2001 Type of Contract Turnkey, Fixed Price Type of Filter Low Pressure Fabric Filter Special Features The Envirotherm / Lurgi Low Pressure Pulse Jet Fabric Filter was chosen as the best available technology for the gas cleaning equipment on the 1 x 350 MW coal fired boiler at Fynsværket. This installation is a retrofit of a 3 field dry ESP to reduce clean gas dust emissions to the lowest level based

• n the selected configuration.

Scope of supply Design, supply, erection and commissioning of the filter, ducting, access, and insulation with turnkey responsibility for the project. Process Conditions

• Gas Flow (actual)

1.026.000 m3/h

• Temperature

125 °C

• Inlet Dust Burden

13,4 g/m3 (STP, dry)

• Dust to be collected

Boiler fly ash

• Guaranteed Emissions

≤ 10 mg/m3 (STP, dry)

• Bag material

PPS

Filter Casing Gas Inlet Filter Roof, Cleaning tanks

Reference 1: Fynsværket, DK

ENVIROTHERM

5

Retrofit : ESP casing now changed into Fabric Filter Reference 1: Fynsværket, DK

ENVIROTHERM

6

Before Retrofit: ESP with 3 electric fields After Retrofit: Fabric Filter with 6 bag bundles Reference 1: Fynsværket, DK

ENVIROTHERM

6 pressure vessels for bag cleaning Rotating arms with nozzles directed down towards the bags for cleaning impulse

Reference 1: Fynsværket, DK

ENVIROTHERM

Project Enstedværket Client Dong Energy Generation A/S Location Aabenraa, Denmark Completion January 2007 Type of Contract Turnkey, Fixed Price Type of Filter Retrofit Conversion ESP into Pulse jet filter Scope of supply Design, aerodynamic testing, supply, erection and commissioning of the filter including piping, insulation, Pre-Coating Silo and Injection. Process Conditions

• Gas Flow (actual)

412.250 m3/h

• Temperature

115 – 160 °C

• Inlet Dust Burden

10 g/m3 (STP, dry)

• Outlet Dust Burden

< 20 mg/m3 (STP, dry)

• Actual emissions

< 2 mg/m3 (STP, dry) Special Features The Envirotherm / Lurgi High pressure Fabric Filter was chosen to convert the existing ESP into a Fabric filter with lower emissions. The existing casing was used.

Reference 2: Enstedværket, DK

ENVIROTHERM

• 1. Removal of ESP electrodes and plates
• 2. Welding works: new tube sheet for bags

and supports for roof and covers

Reference 2: Enstedværket, DK

ENVIROTHERM

• 3. Bags and cleaning pipes installed
• 4. roof and covers closed; valves and blue

pressure tanks installed

Reference 2: Enstedværket, DK

ENVIROTHERM

• 5. Bags installed
• 6. Roof and all covers closed; final

Reference 2: Enstedværket, DK

ENVIROTHERM Referencelist Pulse Jet Fabric Filters