PolyPac packed tower scrubbers are highly recommended for the prevention and efficient removal of inorganic gases, odors, and fumes mainly for exhaust air containing hydrochloric acid and Nitric acid fumes. PolyMist scrubbers are recommended for removing acid mist and fumes from the exhaust air of process bath, mainly for exhaust air containing chromic acid and sulphuric acid. They are used independently or as ‘prescrubber’ to packed scrubber. 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.. System capacities range from 500 cfm to 100,000 cfm.

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®.

Efficiency

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