Air Purification in the Panelboard Industry

Air Purification in the Panelboard Industry

ECONOMIC IN ECOLOGY
Air Purification in
the Panelboard Industry
UMWELTTECHNIK GMBH
System Combination
Wet Absorber and Wet Electrostatic Precipitator
For decades EWK Umwelttechnik
has built plants for air purification and
flue gas cleaning. Proven technology,
experience and continued development
have resulted in an efficient method of
flue gas cleaning in the chipboard
industry.
Emissions from dryers and presses,
such as dusts, organic hydrocarbons,
aerosols, phenols, aldehydes as well
as the widely visible blue haze in the
neighbourhood of chipboard plants,
can be successfully separated. Odour
emissions have also been reduced to
a no longer pestering level. Today we
are thus able to achieve a visible and
noticeable improvement in the quality
of environment.
About the System
The waste gas from the driers as well
as the exhaust air from the presses is
brought to dew point temperature in
the crude gas pipe system by evaporation cooling. Pollutants are simultaneously pre-absorbed.
The absorptive separation of phenol,
formaldehyde as well as other watersoluble pollutants takes place in the
wet absorber.
Aerosols, solids and particularly blue
haze are separated in the down-stream
wet electrostatic precipitator. The
precipitation surfaces are periodically
cleaned by a brief surge of water
during operation.
The post oxidation stage effects an
additional reduction of organic hydrocarbons before the cleaned gas reaches the chimney via a spin collector.
The closed absorbent cycle is
continuously cleaned by coarse and
fine substance filtration in self-cleaning
reversible flow filters. The thickened
sludge is drained by a decanter and
can be disposed in the plant’s furnace,
used in the boards or has to be handled according to local requirements.
With a heat recovery system heat
energy can be recovered out of the
absorbent cycle. This energy can be
used for heating up combustion air,
for heating production hall or even for
feeding into a town heating grid.
The Components
Material:
The collected emissions generate
organic acids because of their solubility in water. To prevent corrosion,
all media-contacting parts are made
of stainless steel. Fittings consist of
stainless steel or non-corrosive
material as well.
Construction:
To keep production, transportation
as well as assembly as economical
as possible, a modular construction
is chosen today. The patented central
support with integrated spin mist
collector bears a key static function.
Key Elements:
With a rotation screen coarse material,
such as loosened caking or coarse
chips, can be collected to reduce possible clogging in the absorbent cycle.
The direct current for the
electrostatic separator is controlled
by thyristors via a high-voltage
aggregate. Current and voltage are
optimized by a special flash-over
control for maximum separation.
Critical components, such as the
absorbent pumps, are implemented
in several units to assure operation
even during breakdowns.
Reversible flow filters, specially
developed for these systems,
remove even the finest solids from
the absorbent cycle.
Filter casing with central support
during assembly
Different types of heat recovery
systems enable to win back valuable
heat of several MW, giving a large
payback of the investment.
The scrubber packing is constructed
of crimped perforated sheets with an
excellent record of resisting clogging.
The actual wet electrostatic precipitator is manufactured of hexagonal
honeycomb clusters. They offer the
largest precipitation surface in the
smallest place.
Reversible flow filter
Central Support with beams for
assembling of prefabricated panels
Vertical absorbent pumps
Water/Air heat exchanger to heat up
combustion air, air volume 80,000 m³/h,
heat output 1.4 MW
DUAL WESP for chip drier, press, boiler
gas volume: 300,000 m³/h
diameter 9,950 mm
Facts and Data
Separating Capacity
Separation Degree in %
Clean gas values
(achievable)
mg/m3
Emissions
(typische)
mg/m3
Dust
200-600
5-10
Org. C
200
80-120
Phenoles
20
5-10
Formaldehyde 50
5-10
Aerosols
5-10
20
40
60
80
100
200-800
● Sewage-free operation possible
● Flocculant dosing improves
solide separation
● Increased crude gas dust content
no problem
● Additional dust dose supports
separation
Blue Haze
1000-2000
Odour in Units 4000-8000
● Normally no chemicals required
● Vapor reduction can be installed
as an option and supports the
visual effect
● Low energy demand, i.e. low
operating costs
Technical Data in Comparison
Gas volume
m3/h
100,000
200,000
400,000
Precipitator diameter
mm
6,400
8,750
12,100
Precipitator resistance
mbar 3.5
3.5
3.5
Absorbent quantity
m3/h
280
480
920
Energy demand
kW
140
210
380
Heat Recovery without condensation
MW
0.7
1.4
2.8
Heat Recovery with condensation
MW
5
10
20
Decanter for solid separation
● Low maintenance
● High availability
● High cost-benefit ratio
● High reliability
● Decrease of fuel costs through
heat recovery
Visualization of the process on a PC facilitates clear monitoring
and allows fast manual intervention
Sample Applications
WESP for chip drier
gas volume 117,000 m³/h
diameter 7,000 mm
combustion air preheating 1 MW
Double DUAL WESP for 2 chip + 2 OSB driers
gas volume 2 x 500,000 m³/h
diameter 2 x 12,600 mm
chimney height 75 m
DUAL WESP for 2 OSB driers
gas volume 2 x 265,000 m³/h
diameter 12,600 mm
chimney height 60 m
The visible Success
before
2 jet stream driers and press
partial devaporization by star cooler
gas volume 150,000 m³/h
diameter 8,700 mm
DUAL WESP for 2 MDF presses
gas volume 2 x 75,000 m³/h
diameter 6,400 mm
heat recovery to heat press hall 700 kW
after
Environmental protection has got
tradition at EWK Umwelttechnik GmbH.
Our plants, proven throughout the
world in decades of operation,
are the best evidence.
Subsidiaries
EWK Anlagentechnik AG
Winterthur
E-mail: [email protected]
Representatives
Due to this experience EWK develops
and offers innovative technologies:
SWITZERLAND
Walter Sonderegger
Klosters / Pany
Phone: +41 (0)81 / 422 54 53
Fax:
+41 (0)81 / 422 54 63
E-mail: [email protected]
ITALY
PRO.TEC. srl
Giussano (Mi)
Phone: +39 (0)362 / 85 29 11
Fax:
+39 (0)362 / 85 37 61
E-mail: [email protected]
● Plant Design
● Engineering
● Production
● Assembly
● Commissioning
● Maintenance/Service
for:
■ Electrostatic Precipitators
■ Fabric Type Filters
Branch Offices
■ Wet absorber/Scrubbers
SWEDEN
Bo-E. Sjöberg
Phone: +46 (0)36 / 16 76 00
Fax:
+46 (0)36 / 17 64 41
E-maill: [email protected]
AUSTRALIA
Hartmut Orth
Phone: +61 (0)3 / 95 93 -15 20
E-mail: [email protected]
NEW ZEALAND
Mason Engineers Ltd.
Phone: +64 (0)9 / 525 05 30
Fax:
+64 (0)9 / 525 05 25
E-mail: [email protected]
POLAND
EWK Polen
Phone: +48 (0)22 / 621 18 91
Fax:
+48 (0)22 / 628 03 25
E-mail: [email protected]
SOUTH KOREA
ATC Korea Co., Ltd.
Phone: +82 (0)2 / 628 03 25
Fax:
+82 (0)2 / 783 68 54
E-mail: [email protected]
CHINA
RGL Group Co., Ltd.
Phone: +86 (0)10 / 84 47 59 18 -221
Fax:
+86 (0)10 / 84 47 59 16
E-mail: [email protected]
■ Catalytic Gas Cleaning Systems
■ Heat Recovery Systems
■ System combinations
EWK Umwelttechnik GmbH
Barbarossastraße 30
67655 Kaiserslautern / Germany
Phone: +49 (0)6 31 / 35 77 - 0
Fax:
+49 (0)6 31 / 35 77 - 111
Internet: www.ewk.de
E-mail: [email protected]
05/09
UMWELTTECHNIK GMBH