 |
 Turboscrubbers are a type of vertical, counter
current packed tower scrubber that use a fluid bed of mobile
packing pieces for the packed bed. The packing is in the
form of hollow, asymmetric, plastic pieces that are fluidized
by selection of the correct gas and liquid rates and ratio.
Fluid Technologies and Osprey Corporation in the UK have
developed the technology to a new level by re-designing the
packing to achieve reliable, predictable performance using
much smaller towers and lower pressure drops than earlier
designs.
The
advantages of using a fluid bed scrubber are:
- Non fouling. The fluid bed motion keeps
the tower clean and free from build-up under even the most
arduous conditions, such as scrubbing with a lime slurry.
- Combined gas absorption and fine particle
removal. Being a packed tower, very high efficiency gas
absorption can be achieved, and the highly turbulent scrubbing
zone also results in very high fine particle collection
efficiency, comparable to a high pressure drop venturi.
- The ability to achieve the above in a
single vessel, reducing operational and maintenance requirements
- Excellent turn-down capability, up to
10:1
Reference
List
FTL/Osprey Turboscrubber®
Fluid Bed Gas Scrubbing Installations
| Company |
Gas Flowrate Am3/Hr |
Application |
Performance |
| Cleanaway, U.K. |
179,000 |
SO2/Particle scrubbing with process heat recovery on
a toxic waste incinerator. |
>99% SO2 removal and >90% particulate removal
@ <1.2mm size.
TRAY RETROFIT |
| G.E.C., U.K. |
8,000 |
Soot/zinc oxide particle scrubbing
of furnace fumes |
>90% particulate removal @ <1mm
size. |
| Octel, U.K. |
20,000 |
Sodium oxide (Na2O) fine particle scrubbing from reactor |
80-90% particulate removal @ 0.6mm size. |
| V.A.W., Germany |
6 x 260,000 |
HF and fine particle scrubbing of
aluminium smelter fumes |
99% HF removal & 90% particulate
removal @ <2mm size. |
| William Blythe, U.K. |
16,000 |
H2S & crystalline particle scrubbing from chemical
reactor |
>99.99% H2S absorption whilst maintained clog free. |
| Rhone Poulenc, France |
2 x 2,500 |
NOx scrubbing from pharmaceutical
continuous reactors |
NOx removal using NaOH 50-70% range. |
| W & S Metallics, U.K. |
4,500 |
NOx scrubbing from metal recovery process |
>70% NOx removal with NaOH. |
| Cannon Hygiene, U.K. |
4,000 |
HCl & fine particle scrubbing
from clinical waste incinerator gases |
>99.9% HCl removal with >90%
particle removal @ <2mm size. |
| Cleveland Potash, (Anglo American) U.K. |
2 x 52,000 |
SO2/particulate removal with heat recovery at potash
mine |
99% SO2 absorption with >99% dust removal @ <2mm
and >4MW heat recovery. |
| Scott Ltd., U.K. |
45,000 |
Fibrous particle removal from tissue
production |
>90% tissue removal. |
| Sasol, South Africa |
23,000 |
Dehumidifying of saturated CO2 gas |
98% dehumidifying to within 5°C approach temperature
from 94°C. |
| Tennants Textiles, U.K. |
38,000 |
Removal of HCl & powders in dye
process |
>99.95% HCl removal and non clogging
operation |
| William Blythe, U.K. |
14,000 |
SO2 & sodium metabi-sulphate particulate removal
from process dryer |
>99.9% SO2 removal +>99% fine particulate. |
| North British Distillery, U.K. |
83,000 |
SO2& particulate removal from
fuel oil combustion boiler |
>99% SO2 removal with >99%
particulate removal @ <2mm. |
| Edward Baker, U.K. |
33,000 |
Odour & particulate removal from pet food manufacturing
plant |
Approx 95% removal of organics with NaOH/NaOCl dosing |
| Cito, Germany |
64,000 |
Alcohol/Acetate/Glycol absorption into a H2O/Biomass
solution |
90-95% organic removal rates. |
| UOP, U.K. |
3,000 |
Hydrogen Chloride
removal at manufacturing unit |
99% HCl absorption & neutralisation |
| Hoechst, Germany |
5,000 |
Tetrahydrafurane removal from chemical plant air stream |
90-98% removal depending on liquid throughput |
| Engelhard, U.K. |
14,000 |
HCl/particulate scrubbing on metal waste incinerator
with plume suppression by cooling & reheat combination |
In series with venturi >99% fine particulate removal.
> 99.9% HCl absorption. |
| APH/Wyeth, Ireland |
76,000 |
SO2 & particulate removal using alkaline effluent
from 52,000lb/hr boiler flue gas c/w high & low grade
heat recovery. |
Up to 99.5% SO2 removal with 95% particulate removal.
Heat recovery capacity = 5.0MW. |
| Corning (Optical Fibres), U.K. |
1 x 75,000
1 x 48,000 |
Cl2, HCl gas & SiO2 particulate removal at a fibre
optics production plant. |
99% Cl2 & HCl absorption. Non foul criterion. |
| Bundi, U.K. |
10,500 |
Particle scrubber with additional HCl absorption capability
at metal coating plant. |
>90% particle removal
@ 2mm size. |
| Sygena, Germany |
3,500 |
TurboScrubber“ for odour removal & gas humidification. |
Design basis 99.5% removal of amines. |
| William Blythe, UK |
11,000 |
Hydrolysis/Absorption of Stannic Chloride (SnCl4)
in vapour form. |
SnCl4 absorbed to 99.95%. Non clog criterion due to
SnO2 particulate formed. |
Witton Chemicals,
U.K. |
5,000 |
Trimethylamine (TMA) gas absorption on batch chemical
reactors. |
TMA absosrption @ 99.99% efficiency. |
| Kraft, USA |
3,500 |
Ethanol (C2H5OH) absorption from
CO2 plant fermenter
vent gas |
C2H5OH absorbed to 99%. Non foul
criterion due to microbial growth. |
| Bartz, Germany |
42,000 |
Oxidation & Reaction of Methyl Formate C2H4O2 in
alkaline solution. |
90% removal design basis, PACKING RETROFIT |
| Cleveland Potash (Anglo American) U.K. |
2 x 25,000 |
Removal of fine KCl dust particles |
98% abatement @ 1.5mm |
Callidus/Shell
U.K. (Offshore) |
60,000 |
Lightweight SO2 absorber using sea water on North Sea
platform. |
SO2 absorption >95% |
| Hercules BetzDearborn U.K. |
10,000 |
Cyclohexylamine & Ethanolamine
removal |
Upgraded to 99.9% efficiency from
80-90%
TRAY RETROFIT |
|
Case
History
Hercules BetzDearborn, Widnes, UK
| SYSTEM DETAILS |
| Mass
Transfer |
| Gas Absorbed |
Amines |
HCl & HCHO |
| Liquid Batch |
H2SO4 |
NaOH |
| Inlet Concentration |
100
mg/Nm3 |
| % Absorbed |
>99.9% |
| Particle
Transfer |
| Particulates |
N/A |
| Mean Particle Size |
N/A |
| % Removal |
N/A |
| Heat Transfer |
| Inlet Gas Temp. |
Ambient |
| % Approach Temp. |
Adiabatic |
| Heat Transfer Rate |
N/A |
| Fluid Dynamics |
| Gas Flowrate |
8500 m3/hr |
4500 m3/hr |
| Operating Mode |
Batch
recycle |
| Pressure Drop |
1000 Pa |
1000 Pa |
| Tower |
| Column Diameter |
1.5 m |
1.0 m |
| Overall Height |
7.75 m |
5.0 m |
| Construction Materials |
PP
with GRP reinforcement |
|
|
 This
retrofit installation was carried out in 2000, the
existing plant consisted of one plate scrubber and
a fixed packed tower in series for the absorption of
HCl and amines into alkaline or acidic solutions. The
two towers & system were upgraded to TurboScrubber
to increase the efficiency to 99.9%, achieve new emission
targets and eliminate chemical vapour plumes. The overall
system upgrade included reactor vessel extraction and
vent lines.
Osprey/FTL’s fluidised bed
TURBOPAK® technology has shown exceptional ability
to simultaneously absorb gaseous components and remove
fine dust and soot particles across a wide range
of industrial applications. In addition the system’s
high mass and heat transfer rates offer considerable
reductions in scale and cost for gas cleaning plant,
for example on chemical processes, dryers, boilers
and incinerators. TURBOPAK®’s non-clogging
nature permits the use of limestone slurries, trade
effluents and biomass as scrubbing media. TURBOPAK® & TURBOID® technology
lying at the heart of the TURBOSCRUBBER® design
are protected by the following patents US 5,376,165,
EP 0456797, UK 0125668.4, & worldwide design/copyright.
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