Conventional Coal Power Plant – Ash Hopper Fabric Retrofit in the USA

The Springerville ash hopper dipper trough was upgraded with a DEKOMTE dry seal expansion joint retrofit, incorporating a new drip shield, flow plate, fabric joint, backing bars and inlet & outlet frames.

Client: UCC / TEP Springerville Power Plant

Springerville Generating Station (SGS) is a state of the art coal-fired power plant that will ensure the future of energy in Arizona. The plant consists of four units: units 1 and 2 generate a capacity of 760 MW, unit 3 adds 400 MW and unit 4 adds another 400 MW. The site also has two BBC DS 50 steam turbines.

Total Output:

1560 MW

Date Operational: 1985
Location: Arizona, USA
Primary Fuel: Coal

Original: Sealing System with Dipper Plate and Water Trough

The Springerville power plant had an original dipper plate into a water trough installed to seal the bottom of the boiler to the ash hopper.

 

Regular problems caused by this design:
  • Contact and deformation of the dipper plate
  • Distortion of the water trough
  • Original wall under dipper trough disintegrated
  • Water leakage into the boiler house

Solution: DEKOMTE Fabric Expansion Joint

The Springerville ash hopper dipper trough was upgraded with a DEKOMTE dry seal expansion joint retrofit, incorporating a new drip shield, flow plate, fabric joint, backing bars and inlet & outlet frames. By offering a complete product scope, DEKOMTE can assure long life and reliability in service. The fabric solution gave gas tightness, which maintains the boiler efficiency and integrity. Performance of the unit was critical to the combustion efficiency in the last years of the plant’s operation.

 

Dimensions Inside:

21211mm x 5095mm

Boiling Operating Temperature: 316°C
Maximum Temperature: 482°C
Movement: Axial: -241mm
Lateral: 64mm
Installation of steel wall replacement.
Installation of insulation bolsters.
Backing bars fitted and fabric expansion joint installed.
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