| abstract |
The invention relates to a method of cooling and cleaning waste gas from an industrial process wherein the waste gas under pressure is caused to pass transversely through a series of pebble bed heat exchangers, the passage of the waste gas through a pebble bed being effective to cause both heat exchange between the gases and the pebbles of the pebble bed, and also removal of a contaminant carried in the waste gas, and wherein the heated pebbles are subsequently used to transfer heat to a cooler gas. The invention also relates to apparatus for operating this method, including apparatus for cooling and cleaning waste gas from a glass melting furnace. The invention helps reduce levels of metal volatiles, oxides of nitrogen, oxides of sulphur, dioxins and particulates in the waste gas. It also makes use of the heat from the waste gas. |