Fly ash treatment by in situ ozone generation
AssigneeElectric Power Research Institute, Inc.
InventorRalph F. Altman
Life of this patent
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Abstract
Disclosed is a method of treating, fly ash having an unacceptably high concentration of carbon, with ozone produced in situ by corona discharge. This method will allow high carbon-content fly ash to be used with air entrainment agents as an additive to cement. The corona discharge can be produced in the exhaust pipe of various combustion systems. The device of this invention can be used in conjunction with a triboelectric carbon-fly ash separation system or in a conventional combustion system. The corona discharge is produced off of sharp-tipped metal devices.
Claims13
In a process for treating negatively charged fly ash particles with unacceptably high levels of carbon which cannot be economically used as an additive for cement comprising turbulently subjecting in a gas stream containing said negatively charged fly ash particles with unacceptably high levels of carbon to an ozone generator comprising an insulator having thereon a metal surface which has at least one metallic sharp-tipped component disposed thereon and wherein the ozone generator produces ozone through corona discharge causing pacification of the fly ash with unacceptably high levels of carbon so that the fly ash can be efficiently used as an additive for cement.
A method for supplying ozone to fly ash with excessively high levels of carbon in the gas stream resulting from combustion of fuel comprising producing a corona discharge resulting in ozone generation in said gas stream thereby producing an ozone treated fly ash product requiring less air entrainment agent to produce an acceptable product for addition to cement in the manufacture of concrete.
An electrostatic device for producing ozone through corona discharge comprising, at least one metallic sharp-tipped component mounted on a metallic surface which in turn is mounted on an insulator, and wherein the electrostatic device can be used in a path of negatively charged fly ash to produce ozone.
In combination an electrostatic device used in the production of ozone comprising a metal surface having at least one metallic sharp-tipped component on the surface thereof mounted in a nonmetallic pipe and used in said pipe to produce ozone through corona discharge.
In a device through which charged particles of fly ash with unacceptably high levels of carbon can flow comprising a channel containing therein a metal plate having a flat surface with at least one metal spike on said flat surface capable of producing ozone through corona discharge when negatively charged fly ash particles with carbon impinge said metal spike on the flat surface of the metal plate.
In a device through which negatively charged particles of fly ash with unacceptably high levels of carbon can flow comprising a channel containing therein a metal plate with a flat surface having affixed on said flat surface a series of wires or spikes capable of producing ozone through corona discharge when said negatively charged particles impact said series of wires or spikes.
Dependencies are inferred from the claim text.