Grün Engineering
Large stainless twin wall flue runs hung from the roof steels above biomass boiler plant
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Flagship project Biomass boiler flues GE1877

Energy centre

Flues for a 2 MW biomass energy centre: two 1 MW boilers, fire rated twin wall, run through the plant hall and out through the roof.

Site
Energy centre
Town
Dartford, South East
Sector
Energy
Status
Complete

Key facts

energy centre, two 1 MW biomass boilers
2 MW
boiler outlets
Ø445
continuous, 200 Pa, 4 hour fire rated twin wall
600°C
bespoke flange adaptors to suit the boiler flanges
6

The challenge

A new 2 MW biomass energy centre on a farm site needed flues for its two 1 MW boilers.

The boilers came with their flanges already fitted, so every connection had to be made to suit.

The flues had to cross a busy plant hall full of boiler equipment and leave through the roof.

What we did

All flues are twin wall insulated and 4 hour fire rated, good for 600°C continuous at 200 Pa.

We made six bespoke flange adaptors to suit the pre-installed flanges.

We supplied tower access inside the building and all the strut channel to support the whole system from the roof steels.

Roof work and final weathering were in our scope.

The result

The flues were installed in December 2020.

Both stacks finish above the roof with storm collars and weathering.

On site.

5 photographs. Tap a photo to see it larger.

Energy centre, Dartford. The flue runs across the plant hall.
Energy centre, Dartford. Runs and tees connecting to the boiler plant.
Energy centre, Dartford. Tee and bend on a bespoke flange adaptor.
Energy centre, Dartford. Two runs hung on strut channel from the roof steels.
Energy centre, Dartford. Both stacks through the roof, with storm collars.

Finishing details

The details we leave behind.

  • Flange adaptor under a flue tee

    Bespoke flange adaptors

    Six adaptors made to suit the flanges already on the boilers.

  • Flue runs hung on strut channel

    Hung from the roof steels

    All strut channel and supports for the whole system were in our scope.

  • Flue stacks on a profiled roof

    Weathered at the roof

    Roof work and final weathering done by us.

Handover

What the client got.

The documents on record for this job. Handover documents normally go into the customer's project folder before the engineers get home.

  • Flue sizing calculationsFrom the boiler information
  • CAD drawingWorking flue route drawing
  • Job-specific RAMS
  • Site photosDecember 2020

Related services

Industrial chimneys and stacks Boiler flues Steelwork and supports

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