Vertical Flow Packed Tower Scrubbers

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Vertical Flow Scrubber Specifications

They consist of one or two stages, each having elements that are suited to the function that it performs. The first stage removes the bulk of the contaminant from the air stream. It 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 re-circulated, addition of fresh water is necessary to purge contaminants that accumulate and to replace evaporation losses. Fresh water may be added to the recycle reservoir either continuously or on a periodic basis.

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 in order to neutralize the acids and maintain a neutral pH. The addition of chemical may be controlled manually, or automatically by a pH controller.

The Fume scrubbers can be fabricated from homogenous, virgin-grade, UV-resistant polypropylene homopolymer, or PVC using hot gas welding methods, Mild Steel, 304 Stainless Steel, 316 Stainless Steel. All units are hydrostatically tested at the factory. The maximum temperature rating for polypropylene units is 180 degrees Fahrenheit and 140 degrees 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, the quality and types of workmanship and materials, and the performance standards and guarantees for equipment, materials and services supplied by Tri-Mer Corporation.

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:

1. All scrubber internals necessary to provide adequate process capture and to achieve the designed performance.

2. Mist eliminator to achieve entrained liquid separation.

3. Flanged connections for all external water fill, water makeup and drain piping as required and optioned.

4. Controls if optioned, to automatically feed make-up water, control liquid level, monitor pressure.

5. Fan if optioned.

6. Complete shop coating of required areas with Tri-Mer Coat or resistant paint for external surfaces.

7. Self contained recirculation system or remote recycle tank.

8. Full turnkey systems.

3. Design Requirements

1. The Wet Scrubbers shell shall be manufactured of Polypropylene, Polyvinyl chloride, (PVC) Stainless steel or Mild steel. Vendor shall evaluate materials and select the most appropriate material for this service.

2. The Wet Scrubber shell shall be provided with access ports / doors to allow limited access to the internals of the unit. The Scrubber shell shall be equipped with flanged pipe connections or female NPT connections for the introduction of makeup and drain water as well as various types of level control, pH fittings, and re-circulation liquid connections.

3. The Wet Scrubbers shall be equipped with random dumped Jaeger Tri Pack packing. The depth of the packing shall be determined per application by TRI-MER Corp.

4. The Wet Scrubber shall be equipped with a high efficiency (95% @ 15 micron and larger) mist eliminator of the chevron blade type of a coalescing type mesh pad. (99% @ 10 micron and larger mist) Material of construction for the mist eliminator shall be PVC (Polypropylene, Stainless Steel also available).

5. The fan, if optioned, shall be manufactured from (FRP, PVC/PP with coated steel impeller, Stainless Steel), or a material which is equally suitable for this environment.

6. The fan and motor shall be designed for system static pressure will 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.

7. The 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 shall furnish silencers.

8. Vendor shall provide electric motor drives for each fan. Vendor shall be responsible for the selection of the motor characteristics and the motor mounting.

9. All electrical equipment provided by the vendor shall be supplied in NEMA rated type enclosures.

10. All equipment manufactured by Tri-Mer Corporation is warranted under the standard Tri-Mer Corporation one-year warranty. All purchased components are warranted under the respective manufacturer warranty.

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4. Standard Supplied Components

Standard Purchased components furnished on the Tri-Mer Corporation Wet Scrubbers are as follows:

1. Dwyer Magnehelic differential pressure gage for monitoring pressure drop.

2. Hayward or equal manual valves for water fill.

3. ASCO or equal electrically actuated solenoid valves for auto water fill.

4. Dwyer fresh water make-up flow meter.

5. ANSI or equal recirculation pump.

6. Signet or equal recirculation liquid flow meter.

7. Schedule 80 PVC plumbing.

8. Vinyl tubing with traps for differential pressure connections.

9. Fan. (See Options, below)

5. Components Supplied by Others

1. Tie downs, guy wires, anchor bolts and foundations.

2. Field assembly.

3. Field wiring.

4. Fresh water and drain piping to supplied 150# flanges.

5. Mating flanges to customer connections, hardware and gaskets.

6. Interconnecting duct. (See Options, below)

7. Heat tracing and insulation.

8. Remote chemical storage.

6. Options:

Electrical Control Panel: An electrical starter and control panel with NEMA 12 enclosure and fused main and disconnect switch. Designed for 460 volt / 3-phase - 60 hertz electrical supply. Internal components of the control panel shall be pre-wired and terminal blocks shall be provided for connection of external control.

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: To consist of level sensors, and water make-up solenoid valve.

High and Low Level Alarms: To consist of level sensors and controls in optioned control panel.

Exhaust Blower: To be constructed of Polypropylene, PVC, FRP, Mild Steel, & Stainless Steel.

PLC Interface:

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