Introduction

Tri-Mer packed tower scrubbers are highly recommended for the prevention and efficient removal of inorganic gases, odors, and fumes.

They are well-suited for use as primary or secondary systems in conjunction with thermal oxidizers, and for use in series where there are multiple-contaminant gas streams.

Vertical Flow Scrubbers are suitable for chemical processes, metal finishing process, semiconductor manufacturing and dozens of other industrial operations generating fumes and gases.

Optimum system performance is achieved with systems that combine intimate gas/liquid mixing and low pressure drop.

There are several factors which influence the design of these systems:

CFM

Air flow through the scrubber, based on cubic ft/min. This is determined by the process to be handled by the scrubber, through information provided by customer and Tri-Mer analysis. System capacities of heavy service range to 100,000 cfm and above.

Configuration

Internal vs. external recirculation system, fan location in relation to tower, duct sizes, inlet and outlet plus location of pump systems, tower access service ports, service platform requirement all influence layout.

Standard construction materials include: polypropylene, fiberglass and PVC. Optional materials include high alloy metals such as stainless and Hastelloy^®. Also dual-laminate structures incorporating FRP over PVC, PP, PVDF and Teflon^® liners are available.

Efficiency

Removal efficiency of scrubber: inlet vs. outlet requirement, based on mass emission in lbs/hr. in vs. lbs/hr. out.

Factors to consider in calculating removal efficiency are:

1. contaminant flow composition
2. contaminant solubility
3. chemistry that will react with contaminants
4. reaction speed
5. HTU (height transfer unit) factors required for specified removal efficiency (packing depth)
6. liquid-to-gas ratio
7. velocity
8. gas temp. – up to 2000°F with Q-Scrub quench option

System Design

Using this information and other factors specific to the site, Tri-Mer engineers determine the optimum tower diameter, packing depth, recirculation flow rate, and mist eliminator requirement. These calculations form the basis for a layout similar to the above photograph.

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title: Vertical Flow Packed Tower Scrubbers