Bag house
filter
From
boiler
District heating
Acid
Lime
Condensing
scrubber
scrubber
ADIOX
scrubber
NH
3
stripper
General aims:
Provision of an additional safety feature, a
“police
filter”, in case of operational disturbances. Experience
shows that disruptions so occur, causing both short-
term peaks and a more long-term increase in dioxin
emissions: the “memory effect”.
Disturbances may be of different types, such as in-
creased levels during start-up, additive dosing prob-
lems, or filter bag rupture.
Description:
The Dåva municipal waste incineration plant, outside Umeå in northern Sweden, commenced opera-
tions in spring of 2000. The flue gas treatment system was designed and built by Götaverken Miljö. The
principal components in the gas stream are a bag house filter with coke injection for dust and dioxin
removal, an acid scrubber and a Ca(OH)
2
-scrubber for acid removal, plus a condensing scrubber for
energy recovery.
Boiler output is 55 MW, corresponding to some 18 tons/hour of waste incinerated. As a result of an
efficient condensing system and a heat pump arrangement, as much as 51 MW of energy is produced
for district heating. This is additional to the 15 MW of electricity generated in the turbine.
Measurements show 0.027 ng/Nm
3
of dioxin at the inlet of the condensing scrubber and 0.005 ng/Nm
3
at the outlet, thus there is an approximate 80 % reduction in the dioxin concentration.
G
Ö
TAVERKEN MILJ
Ö
AB
Postal address Box 8876, SE-402 72 Göteborg, Sweden
•
Visiting address Anders Carlssons gata 14
Telephone +46-31-50 19 60
•
Telefax
+
46-31-22 98 67
www.gmab.se
