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FUME SCRUBBERS | CASE STUDY #1 | CASE STUDY #2 | CHART | CROSS SECTION VIEW Vertical Flow Fume Scrubbers These fume scrubbers consist of one or two stages. Stage One removes the bulk of the
contaminant from the air stream and may be continuously wetted to prevent plugging.
The second stage is a mist eliminator. In a wet scrubber, water or scrubbing liquid is the media which removes pollutants from the air.
When the water is recirculated, addition of fresh water is necessary to purge contaminants
and replace evaporation losses. Fresh water may be added to the recycle reservoir
continuously, or periodically. Scrubbers are frequently used in applications where the air stream is being treated to remove
acid fumes. Strong alkali is often added to the recycled scrubbing solution to neutralize the
acids and maintain neutral pH. The addition of chemical may be controlled manually,
or by a pH controller. Fume scrubbers can be fabricated from homogenous, virgin-grade, UV-resistant
polypropylene homopolymer, PVC using hot gas welded. Units are hydrostatically tested
at the factory. The maximum temperature rating for polypropylene units is 180° Fahrenheit;
140° for PVC. Bolted access ports are provided for inspection of the interior packing and mist eliminator
elements. Gasket made from closed cell PVC foam is provided. Hardware is 316 S.S.
maximum bolt torque 10#. 1) INTENT This specification defines the design requirements, quality and types of workmanship
and materials, and performance standards and guarantees for equipment, materials and
services supplied by Tri-Mer. 2) SCOPE The vendor (Tri-Mer Corporation) shall furnish wet scrubbers complete with auxiliaries
and options described herein. The system shall include but is not limited to the following:
- All scrubber internals necessary to provide adequate process capture and
to achieve the designed performance.
- Mist eliminator to achieve entrained liquid separation.
- Flanged connections for all external water fill, water makeup and drain piping
as required and optioned.
- Controls if optioned, to automatically feed make-up water,
control liquid level, monitor pressure.
- Complete shop coating of required areas with Tri-Mer Coat or resistant
paint for external surfaces.
- Self-contained recirculation system or remote recycle tank.
3) DESIGN REQUIREMENTS
- The Wet Scrubber's shell shall be manufactured of Polypropylene, Polyvynilchloride, (PVC)
Stainless steel or Mild steel. Vendor will select the most appropriate material for this service.
- The Wet Scrubber shell shall be provided with access ports / doors to allow limited access
to the internals of the unit. The Scrubber shell has flanged pipe connections or female NPT
connections for introducing makeup and drain water as well as level control, pH fittings,
and recirculation liquid connections.
- The Wet Scrubbers are equipped with random-dumped Tri Pack packing.
The depth of the packing is determined by Tri-Mer.
- The Wet Scrubber is equipped with a high efficiency (95% @ 15 micron and larger)
mist eliminator, chevron blade type of a coalescing type mesh pad (99% @ 10 micron
and larger mist). Material for the mist eliminator is PVC (Polypropylene,
Stainless Steel also available).
- The fan, if optioned, is manufactured from (FRP, PVC/PP with coated steel impeller,
Stainless Steel), or a material equally suitable.
- The fan and motor is designed for system static pressure per application depending
on packing depth and mist eliminator selection. Pressure drop calculations through
the Scrubber plus external delta P for the customers ductwork losses.
- Sound levels generated by the Vendor-furnished equipment during normal operation
shall not exceed 85 dBA-weighted, slow response, under free field condition, at a
horizontal distance of 10 feet from the surface of sound generation. The Vendor as
optioned will furnish silencers.
- Vendor will provide electric motor drives for each fan. Vendor is responsible for the
selection of the motor and the motor mounting.
- All electrical equipment provided by the vendor shall be supplied in
NEMA rated type enclosures.
- All equipment manufactured by Tri-Mer is warranted under the standard
Tri-Mer Corporation one-year warranty. Purchased components are warranted
under the respective manufacturer warranty.
4) STANDARD SUPPLIED COMPONENTS Standard purchased components furnished on Tri-Mer Wet Scrubbers are as follows:
- Dwyer Magnehelic differential pressure gage for monitoring pressure drop.
- Hayward or equal manual valves for water fill.
- ASCO or equal electrically actuated solenoid valves for auto water fill.
- Dwyer fresh water make-up flow meter.
- ANSI or equal recirculation pump.
- Signet or equal recirculation liquid flow meter.
- Schedule 80 PVC plumbing.
- Vinyl tubing with traps for differential pressure connections.
5) COMPONENTS SUPPLIED BY END USER
- Tie downs, guy wires, anchor bolts and foundations.
- Fresh water and drain piping to supplied 150# flanges.
- Mating flanges to customer connections, hardware and gaskets.
- Interconnecting duct. (See Options).
- Heat tracing and insulation.
6) OPTIONS
- Electrical Control Panel: An electrical control panel with NEMA 12 enclosure and
fused main disconnect switch. Designed for 460 volt / 3-phase - 60 hz electrical supply.
Internal components of the control panel are pre-wired and terminal blocks are provided
for connection of external control components to be done by contractor. A motor starter
to operate the exhaust fan and recycle pump with pushbutton controls mounted on front
of the enclosure. Power lines to the motor must be furnished and installed by the
installation contractor. Electrical devices are designed and built in accordance with
the National Electric Code (NEC). No other codes, standards, or specifications are
followed unless a specific agreement has been obtained in writing.
- PH Control: To consist of pH sensor, analyzer, chemical metering pump. Components
may be factory installed or shipped loose for remote customer location.
- Automatic Liquid Level Control: Level sensors, and water make-up solenoid valve.
- High and Low Level Alarms: Level sensors and controls in optioned control panel.
- Exhaust Blower: Constructed of Polypropylene, PVC, FRP, Mild Steel, Stainless Steel.
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LITERATURE l PRESS RELEASES l CONTACT US Tri-Mer Corporation
1400 Monroe Street
P.O. Box 730
Owosso, MI 48867; USA
Phone: (989) 723-7838
Fax: (989) 723-7844
salesdpt@tri-mer.com © Copyright 2008 Tri-Mer Corporation
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