Packed-tower wet scrubber

References 77 through 90 provide additional information on packed tower wet scrubbers, design and scale-up principles, as well as operational guidance. 

Schrader Environmental Systems, Inc. Air pollution control technologies such as catalytic oxidizers, packed tower wet scrubbers, dust collectors. http //WWW. anseWre. com... 

Packed-tower wet scrubber A gas scrubber that removes gases and vapors, by using either v/ater or a chemical liquid method. Efficient pollutant removal depends on the contact time between the entering gas stream and the wetted surface of the pack in the tower. This type of scrubber can be classified as... 

Counce RM, Perona JJ. Designing packed-tower wet scrubbers emphasis on nitrogen oxides. In Cheremisinoff NP, ed. Handbook of Heat and Mass Transfer. Vol. 2. Houston Gulf, 1986 953-966. 

R. M. Counce, J. J. Perona, Designing Packed-Tower Wet Scrubbers Emphasis on Nitrogen Oxides, in Handbook... 

Many devices are used for wet gas scrubbing such as spray towers, packed towers, plate scrubbers such as the Peabody scrubber or Venturi scrubber. Scrubbing liquor is circulated through the scrubbing system and becomes acidic due to the absorption of SO3 contained in sinter plant gas. Often the... 

Of the three categories, the packed column is by far the most commonly used for the absorption of gaseous pollutants. Miscellaneous gas-absorption equipment could include acid gas scrubbers that are commonly classified as either wet or diy. In wet scrubber systems, the absorption tower uses a hme-based sorbent liquor that reacts with the acid gases to form a wet/solid by-product. Diy scrubbers can be grouped into three catagories (1) spray diyers (2) circulating spray diyers and (3) dry injection. Each of these systems yields a diy product that can be captured with a fabric filter baghouse downstream and... 

Absorption of pollutant gases is accomplished by using a selective liquid in a wet scrubber, packed tower, or bubble tower. Pollutant gases commonly controlled by absorption include sulfur dioxide, hydrogen sulfide, hydrogen chloride, chlorine, ammonia, oxides of nitrogen, and low-boiling hydrocarbons. 

Packed Towers (also known as wet-scrubbers) A packed tower is a vessel that is filled with some suitable packing material. The liquid is introduced at the top of the tower and flows down through the packing to the bottom, and in so doing, exposes a large surface area to contact with the gas. The gas may be introduced at either end of the tower since the gas and liquid flows may be either co-current or counter-current. The counter-current operation is most commonly used. 

Scrubbers Wet Cyclonic, Packed Tower, Impingement, and Venturi... 

Wet scrubbers have found widespread use in cleaning contaminated gas streams because of their ability to effeetively remove both particulate and gaseous pollutants. Specifically, wet scrubbing describes the technique of bringing a contaminated gas stream into intimate contact with a liquid. The types most widely used for particulate control are spray towers, packed-bed units, ionizing wet scrubbers, and venturi scrubbers. 

For the absorption of soluble gases or particulates from the gas streams, scrubbers can be used. These are generally simple packed columns, spray towers, or Venturi units. Design methods are well established [236]. Attention must be paid to the prevention of sprays, mists, and carryover when wet scrubbers are used. 

Other Types of Wet Scrubbers. Plate towers, like sieve, valve, and bubble cap towers, and packed beds have been used in the past for dust collection but these are all subject to plugging. 

Of the above parameters, the ability to increase gas/liquid contact will always result in higher absorption efficiency in a wet scrubber. If temperature can be reduced and the liquid-to-air ratio increased, then the absorption efficiency will also be improved in the scrubber. The actual design of the tower (diameter, height, depth of packed bed, etc.) will also depend on the given vapor/liquid equilibrium for the specific pollutant/scrubbing liquor. Additionally, the type of tower (packed vs tray, and so on) used will affect this equilibrium. The design of wet scrubbers is not covered in this chapter, but design examples can be found elsewhere in the literature (14). 

---