Vattenfall AB

Panel Walls and Economizer Replacement - Uppsala, Sweden

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Client: Vattenfall AB

Year: 2015-2016

Milestones

• Contract: 18-03-2015
• Manufacturing: 18-05-2015
• Installation: 28-07-2015
• Hand over: 14-08-2015

Data

• Fuel: Waste
• Steam temperature: 201 oC
• Steam pressure: 16 bar

Project description

The delivery includes project management, engineering, procurement, manufacturing and replacement of an economizer for a waste-to-energy boiler (Line 1) in Uppsala, Sweden. Also included in the project was to replace panel walls including cladding with Inconel® 625 on site.

• The following was included in the scope:
• Left and right sidewall for 2nd pass
• Roof for 2nd pass
• Rear wall for 2nd pass
• Economizer
• Connection tubes
• Inconel cladding

During 2015 the panel walls and economizer were replaced. The econimizer was delivered in 26 sections. A temporary steel structure was built and placed next to the crane for pre-assembly of the economizer sections.

In addition to the economizer replacement, approximately 150 m2 of Inconel-cladded panel walls and screen tubes were installed in the 3rd pass. All panels were lowered through the roof of the boiler house.

2015 project milestones

• Early July: established scaffolding outside boiler and dismantled insulation sheeting
• July 20 to August: shut down boiler, established scaffolding inside boiler, dismantled panel walls and existing economizer, installed new panel
  walls and economizer, pressure tested and cladded Inconel to site welds
• Mid-August: completed installation

2016 project milestones

• Mid-July: shut down boiler
• Mid July to beginning of August: established scaffolding inside boiler and panel walls were prepared for cladding by sandblasting
• Beginning of August to mid-August: cladded Inconel, performed by semi-automatic robots on vertical panel walls and manually on horizontal walls and places unsuited for robots. Total area cladded on site was approximately 125 m2.

Vattenfall AB, Heat Sweden Operations produces, distributes and sells electricity, district heating and cooling in Sweden