Air Pollution Control Equipment Selection Guide, Second by Kenneth C. Schifftner

By Kenneth C. Schifftner

This booklet is an effective dialogue of assorted pollution keep an eye on apparatus. It covers a variety of gear and offers a very good evaluation of the foundations and purposes. Very beneficial is the sensible studies that aren't in most cases to be had in a customary textbook. The language is simple to appreciate, specifically when you do not need formal education in pollution keep an eye on. It offers hybrid structures such Read more...

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Extra info for Air Pollution Control Equipment Selection Guide, Second Edition

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On many applications, the use of a regenerative type adsorber can provide significant savings in recovered solvent or chemical. With the exception of the rotating wheel type adsorber, the capacity of any adsorber slowly decreases from the moment of initial operation. As the adsorption gradually moves to the point of breakthrough, the adsorption efficiency stays relatively constant. For this reason, time or a breakthrough sensor (hydrocarbon analyzer) must be used to determine breakthrough. If batch type adsorbers are used, one must carefully monitor the time between regeneration or replacement, or invest in monitoring equipment that indicates when regeneration or replacement is required.

Because the gas absorption process determines the NTUs, not the device itself, all gas absorbers can be modeled as equivalents. Any absorption problem can be defined in terms of an equivalent of a packed tower, tray tower, fluidized bed scrubber, spray tower, a mesh pad tower, and so on. There are no miracles that somehow allow a particular design to avoid the realities, the chemistry, of gas absorption. The concept of NTUs makes it easy to compare devices. The number of transfer units can be expressed simply as follows: NTU = ln(concentration IN/concentration OUT) where ln is the natural log.

For some applications, such as syngas gasification systems, the gas mixture departs radically from that of standard air. Gasification systems typically operate with little or no oxygen and instead have significant quantities of hydrogen, carbon monoxide, and methane. These gases tend to reduce the gas density, which in turn reduces the gas stream kinetic energy. These gases also exhibit higher specific heats, meaning that more heat energy can be carried per unit volume than if the gas stream were standard.

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