ABSTRACT
Dry scrubbers are proving to be one of the most effective methods to meet the new limitations on air toxics emissions required by the new Clean Air Act. Although there are several configurations of dry scrubbers, they all combine an acid gas scrubbing technique that produces a dry product with a particulate removal device for removal of all of the pollutants in a dry state. Each of the dry scrubbing techniques has three basic elements to the operation: temperature reduction and control, reagent injection, and particulate removal. In a baghouse the build-up of particulate on the bags causes a restriction to flow (increase in pressure drop) and periodically the bags must be cleaned. This can be accomplished by different techniques, the most popular being pulse jet cleaning, where a jet of compressed air is blown down the inside of the bags.
