REFRACTORY LINED EXPANSION JOINTS FOR COAL DUST
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.
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
- 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
- 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
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 •
RELATED CASE STORIES
INSTALLED COAL DUST
In this case story you can see photos of installed Coal Dust Expansion Joints in a power plant.
Read this interesting case story describing how we developed this remarkable Expansion Joint for the client.
Special designed Refractory Lined Expansion Bellows to avoid unwanted coal dust emissions in a power plant.