Vertical Tower Scrubbers

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Tri-mer’s Vertical Packed Bed Scrubbers control fumes/gases and are ideal for gas streams with high loading.

Tri-Mer packed scrubbers are highly recommended for the prevention and efficient removal of inorganic gases, odours, and vapour fumes. They are well-suited for use as primary or secondary systems in conjunction with thermal oxidizers, and are also used 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:
Air flow through the scrubber (Nm3/h): 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 kg/h in vs. kg/h out. Factors to consider in calculating removal efficiency are contaminant flow composition, contaminant solubility , chemistry that will react with contaminants, reaction speed , HTU (height transfer unit) factors required for specified removal efficiency (packing depth), liquid-to-gas ratio, velocity, gas temp. – up to 2000°F with Q-Scrub quench option

Horizontal Crossflow Scrubbers

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Tri-mer’s horizontal crossflow scrubber guarantees your operating permit level out the stack for HCl, HNO3, HF, H2SO4, Cl2, H2S, NH3 and other contaminants.

The Tri-Mer Crossflow scrubs virtually all inorganic compounds, and maintains stack emissions to specific pm levels determined by local permit requirements for all input concentrations.

Specific outlet requirements based on percent removal can also be guaranteed. Key to the performance of this industrial equipment is high-flow liquid recirculation, which produces intense contact between the contaminant and scrubbing liquid.

Three industrial system configurations are available:

• The internal tank/ANSI pump design is manufactured in capacities of 85 Nm3/h through 170,000 Nm3/h
• An internal Tank/Vertical pump design is available for 85 Nm3/h through 102,000 Nm3/h applications
• An external recirculation System/Dry Sump design is available in single or multiple stage options, with a maximum single unit capacity of 204,000 Nm3/h.

The Tri-Mer Ultra-Scrub Crossflow versions operate with zero production down time, because critical system modules have full redundancy. Back-up readiness is assured through regular auto handover from primary systems. This feature significantly reduces both monitoring and maintenance requirements, and assures full operation, even during normal maintenance of the equipment.

Crossflow industrial scrubbers are supplied with control panels and operator interface. Standard material of construction is UV stabilized polypropylene. PVC and stainless steel are optional materials. Tri-Mer crossflow scrubbers use Tri-Packs tower packing and high-efficiency industrial mist eliminators. Quench equipped systems can accommodate inlet temperatures to 2000°F.

Applications for the Crossflow Scrubber include a broad range of industrial manufacturing and process industries, including semiconductor, metal finishing, chemical industries and all facilities generating corrosive fumes and gases.

The Crossflow is specified according to the following main parameters:

Velocity: Velocity translates into residence time. Residence requirements in the system can vary from 1⁄2
second to several seconds.

Inlet/Outlet Load Factors: For a specific system guarantee regarding removal efficiency, it is necessary to have a definition regarding input vs. output. This number is expressed as mass emission per hour in vs. out. Volumetric expressions, including ppmv, are also appropriate.
Volumetric Flow: The gas flow through the scrubber system, expressed in m3/h, is an important factor in the design of the scrubber vessel. Since residence time in the scrubber is a critical design consideration, the volume of air passing through the scrubber directly affects the cross sectional area.

Inlet Gas Temperature: Most metal finishing applications operate under 38oC (100°F) inlet temperature. Tri-Mer Crossflow Systems can accommodate inlet temperatures from ambient to over 1093oC (2000°F). High temperature systems require a gas quench, integral to the system.
Gas Stream Profile: Understanding the gas stream variables, which include residuals riding in the gas stream in addition to the primary contaminant to be removed, is crucial. Residuals may not be of primary interest from the standpoint of removal efficiency, but could affect system chemistry, or, if particulates are involved, may restrict flow if not accommodated.

System Blowdown Rates: Blow-down rates are determined by the chemistry involved within that scrubber. Systems requiring low ppb outputs require higher water blow-down capacities than systems operating higher output dynamics. Specific multistage systems may require multiple blow-down points to a final treatment tank.

Liquid-to-Gas Ratio: This ratio is determined by the items discussed earlier. System removal requirements play an important role.