초록 ▼

Fly ash and fine dust in a gas stream from a coal combustor, for example, are efficiently collected in a 2-stage, tubular, granular bed filter. The stages of the filter are arranged one above the other so that the granules may move from the upper stage to the lower stage under the influence of gravi

Fly ash and fine dust in a gas stream from a coal combustor, for example, are efficiently collected in a 2-stage, tubular, granular bed filter. The stages of the filter are arranged one above the other so that the granules may move from the upper stage to the lower stage under the influence of gravity. Larger particulate in the gas stream is first collected by the lower stage, and then the remaining particulate is electrically charged and collected by the upper stage. Both stages are electrified sufficiently to rigidify the granular beds and adhere the particulate to the granules, so that the granules and the collected particulate move downwardly through the filters as a plug. Granules that exit from the lower stage are cleaned and returned to the upper stage. Non-porous granules may be used to prevent fine particulate from becoming embedded in the granules.

대표청구항 ▼

A method of removing particulate from a gas stream comprising providing a first filter having a tubular granular bed, providing a second filter having a tubular granular bed, the second filter being located above the first filter with the beds aligned, passing a gas stream containing particulate inw

A method of removing particulate from a gas stream comprising providing a first filter having a tubular granular bed, providing a second filter having a tubular granular bed, the second filter being located above the first filter with the beds aligned, passing a gas stream containing particulate inwardly through the first filter and then outwardly through the second filter, moving the particulate in series through the second filter and then through the first filter, electrifying the granules in the second filter for the collection of particulate, and, interiorly of the first filter, electrically charging particulate in the gas stream before it passes through the second filter.