Case

Grästorp, Sweden

Before Aerovit installation

Fuel

Wood chips and Salix

Boiler

3.5 MW – installed 2002

Soot-blower

The boiler was delivered with a soot-blowing system at the top of the boiler. The system was from another supplier and therefore without the patented cooling system

  • 9 pcs. valves on 1st stroke countercurrent
  • 5 pcs. valves on 2nd stroke wake
  • 7 pcs. valves on 3rd stroke countercurrent

 

Efficiency

Mechanical cleaning was necessary several times per month – the pipes were not kept clean.

 

Initiative

It was decided to replace the soot-blowing system on the 1st stroke. AEROVIT soot-blowers on a new boiler door were delivered February 2003.

AFTER Aerovit Installation

Result

  • Mechanical cleaning only necessary twice a year.
  • The pipes in 1st stroke are now kept clean.
  • The pipes in 2nd stroke are now kept fairly clean.
  • The pipes in 3rd stroke are not kept clean.

 

Future

If the remaining soot-blowing system is replaced with AEROVIT valves, it is to be expected that there will be a need for mechanical cleaning only once every 2 or 3 years.

Service carried out on all valves after 4 years in operation

The 12 valves without the patented cooling system
All 12 valve diaphragms were burned or melted, cracked and rigid – clearly affected by the heat from the boiler’s turn box. All diaphragms had to be replaced.

Corrosion in the shot tube of the valves – obviously affected by corrosive flue gas. The shot tube is almost sooted up in consequence of dysfunction.

The 9 valves from Aerovit with the patented cooling system
The AEROVIT SYSTEM – with cooling – on 1st stroke has faultless function. All 9 valves and valve diaphragm are in good condition and require no replacement. Clear result of AEROVIT’s patented system with cooling air.

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