Condensation cleaning of particulate laden gases
AssigneeQuad Environmental Technologies Corp.
InventorEgbert deVries
Life of this patent
Estimating the term…
Abstract
Particulate laden gas, especially those gases carrying particulates having a size in the micron or submicron range, are removed by humidifying the gas with water and thereafter subjecting the gas to indirect contact heat exchange sufficient to provide an energy transfer for water vapor condensation of at least 5 horsepower per 1000 cfm. Heat exchange is accomlished by passing the gas downwardly through an exchange element having smooth and vertical gas passages of a relatively large dimension.
Claims24
A method for removing finely divided particulate matter and other contaminants from gas streams selected from the group consisting of furnace emissions, steel industry waste gases, food industry waste gases and combustion flue gases which comprises:
- humidifying the gas stream with water;
- subjecting the humidified gas stream to indirect contact heat exchange sufficient to lower the gas stream to a temperature below its dew point, thereby condensing water on the surfaces of said particulate matter, and to provide an energy transfer for condensation of water vapor in said gas stream of at least 5 hp per 1000 cfm, said heat exchange being accomplished by passing said humidified gas stream directly to and downwardly through a heat exchange element having smooth and essentially vertical gas passages of relatively large dimension thereby causing migration of said particulate matter from the gas stream to the surfaces of said heat exchange element;
- separating condensed water, now containing particulate matter, from the gas stream, and
- recovering a gas stream substantially depleted of particulate matter.
A method for removing finely divided particulate matter and gaseous contaminants from gas streams which comprises:
- humidifying the gas stream with water;
- introducing a chemical reactive with said gaseous contaminants into the gas stream;
- and thereafter
- subjecting the humidified gas stream to indirect contact heat exchange sufficient to lower the gas stream to a temperature below its dew point, thereby condensing water on the surfaces of said particulate matter, and to provide an energy transfer for condensation of water vapor in said gas stream of at least 5 hp per 1000 cfm, said heat exchange being accomplished by passing said humidified gas stream directly to and downwardly through a heat exchange element having smooth and essentially vertical gas passages of relatively large dimension thereby causing migration of said particulate matter from the gas stream to the surfaces of said heat exchange element;
- separating condensed water, now containing particulate matter, from the gas stream, and
- recovering a gas stream substantially depleted of particulate matter.
Dependencies are inferred from the claim text.