Case story

REFRACTORY LINED EXPANSION JOINTS FOR COAL DUST

Power plant

Poland

EN 13445

State-of-the-art Expansion Joints engineered to eliminate coal dust emissions between mills and burners! Belman has designed, manufactured and supplied 41 sets of Refractory Lined Universal Expansion Joints for installation on the pulverized fuel ducts of the boilers in a Polish Power Plant. Due to the supercritical coal dust media the expansion joints were refractory lined.

 

Critical design parameters

This power plant was equipped with supercritical once-through pulverized fuel boiler for bituminous coal and an extraction-condensing turbo set in a closed cooling water system with wet cooling tower.
The media in the fuel ducts is a mixture of air with pulverized coal dust, this lead to the requirement for the special insulation of the expansion joints. Coal dust is extremely abrasive and can backfill in the bellows of the expansion joints. For that reason, the expansion joints were designed with DENSIT® to prevent the erosion of the inner lining. Ceramic wool was additionally installed around the bellow. Additional insulation using special braided hose was also added to provide further protection against the aggressive medium.

 

Articulated expansion joints

The expansion joints are articulated with a section of flanged pipe between the two angular expansion joints. As the two angular expansion joints are articulated they can work in the same way as a universal expansion joint by absorbing movements simultaneously in several planes. This solution was selected as the boilers tended towards movement in all 3 planes. Additionally, all the expansion joints were designed in accordance with their position in the system to increase the working efficiency and lengthen life cycles.

 

Special primer and coating required

As per the customer’s specifications, the expansion joints were coated with a primer which is a two-ingredient ethyl-zinc-silicate grey paint and further coated with a grey single ingredient matrix paint. This special paint provides improved protection against corrosion to the expansion joints. This type of ethyl-zinc-silicate primer can provide protection for many years.

 

Experienced in Refractory Lined Expansion Joints

Belman is highly experienced in the design and supply of customized refractory lined expansion joints for both boilers, FCC and other critical applications in various types of plants.

DESIGN FEATURES

The Refractory Lined Expansion Joints have the following design parameters:
Dimension: DN 600 • Length: 3460 mm • Medium: Air mixture of coal dust • Design temperature: 140°C • Design pressure: 0,05 barG • AX: +/-80 mm • LA: +/-596,6 mm • Bellows: 1.4541 • Welding ends: 1.0345 • Flanges: 1.0425 • Middle pipe: 1.0345 • Design code: EN 13445

CLIENT BENEFIT

  • Short on-time delivery
  • Coal dust emissions prevented between the mill and the burner contribute to reducing pollution and environmental issues for the plant.
  • Reliability of the Expansion Joint designed to work under the operating parameters
  • Increased working efficiency and lengthened life cycle reduce operating costs and downtime.
  • Benefit from the considerable know-how of an experienced manufacturer
RELATED INFORMATION

TECHNICAL information

  • Technical information on Angular Expansion Joints is available in the Expansion Joint Catalogue
    page 29 -30
  • Installation examples of Angular Expansion Joints are available in the Expansion Joint Catalogue
    pages 68 -73

REFERENCES 

Vattenfall • Termo Petroleo • Ørsted (Dong Energy) • RWE • Irkutsk Energo • STEAG • Novosibirsk Energo • Mosenergo  •  Drax • Hofor • Tauron • PakGen • BHEL • Ceylon Electricity Board • Rosatom • RWE Npower • Fortum • EDF (British Energy) • AEP Energy Services •  E.ON • Inter RAO • Fernwärme Wien • ENGIE Electrabel • Enel • Howden Turbo UK • Uniper • Veitur • Ceylon • Howden • Mitsuibishi Power • Stadtwerke Flensborg • Kraftzer •

TRUSTED CRAFTMANSHIP

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