Rotary electrostatic precipitator

Claim 2

A ROTARY ELECTROSTATIC PRECIPITATOR COMPRISING A HOUSING PROVIDED WITH AN INLET FOR RECEIVING A DUST LADEN GAS STREAM UNDER PRESSURE AND AN OUTLET FROM WHICH SAID GAS STREAM ISSUES SUBSTANTIALLY FREE OF DUST, AN ANNULAR ROTARY DUST COLLECTOR MEANS COMPRISING A ROTATABLE SHAFT HAVING A PLURALITY OF DISC ELECTRODES MOUNTED THEREON WITHIN SAID HOUSING AND POSITIONED IN THE PATH OF THE GAS STREAM BETWEEN SAID INLET AND SAID OUTLET, SAID DUST COLLECTOR MEANS ROTATING ABOUT A PREDETERMINED AXIS, A PLURALITY OF RADIALLY EXTENDING DISCHARGE MEANS SUPPORTED WITHIN SAID HOUSING IN SPACED RELATION TO SAID COLLECTOR MEANS AND BEING ADAPTED FOR CONNECTION TOGETHER WITH THE DUST COLLECTOR MEANS TO A SOURCE OF ELECTRICAL CURRENT FOR IONIZING DUST PARTICLES PASSING THEREBETWEEN FOR COLLECTION BY SAID DUST COLLECTOR MEANS, FIRST AND SECOND AXIALLY EXTENDING MEANS AT SAID INLET AND SAID OUTLET ENDS OF THE PRECIPITATOR, RESPECTIVELY, SAID FIRST AND SECOND MEANS BEING POSITIONED WITH RESPECT TO SAID INLET AND OUTLET ENDS AND THE DISCS OF SAID ANNULAR DUST COLLECTOR MEANS TO DIRECT SAID GASEOUS STREAM FROM SAID INLET THROUGH A FIRST ZONE, THROUGH WHICH SAID DUST COLLECTOR MEANS ROTATES IN PROXIMATE SPACED RELATION TO SAID DISCHARGE MEANS, TO SAID OUTLET, SAID FIRST AND SECOND MEANS ALSO DEFINING A DUST REMOVAL ZONE WHICH IS LIQUID-FREE AND ISOLATED FROM SAID FIRST DUST COLLECTING ZONE, SAID DUST COLLECTING MEANS DURING ROTATION THEREOF ROTATING THROUGH SAID FIRST DUSTIG COLLECTING ZONE AND SIMULTANEOUSLY THROUGH SAID DUST REMOVAL ZONE, MEANS ON SAID SECOND MEANS IN ENGAGEMENT WITH SAID DUST COLLECTOR MEANS FOR REMOVING DUST FROM THAT PART ONLY OF THE DUST COLLECTOR MEANS WHICH PASSES THROUGH THE DUST REMOVAL ZONE, AND CONVEYOR MEANS BELOW THE DUST REMOVAL ZONE AND IN COMMUNICATION THEREWITH FOR THE CONVEYING TO WASTE DUST FROM THE DUST REMOVAL ZONE, SAID DUST FROM THE DUST REMOVAL ZONE FREELY FALLING ONTO THE CONVEYOR MEANS.

Claim 3

A rotary electrostatic precipitator as claimed in claim 1, wherein the discharge means comprises groups of a plurality of radially extending, circumferentially spaced discharge units, each group having discharge units which are in axial alignment with discharge units of other groups, at least one group of discharge units being associated with a disc electrode of said dust collector means.

Claim 4

A rotary electrostatic precipitator as claimed in claim 1, wherein said plurality of disc electrodes are fixedly mounted on a rotatable shaft in axially spaced apart relation and said discharge means comprise groups of a plurality of radially extending, circumferentially spaced discharge units, all but one of the groups of said discharge means being disposed in the spaces between the disc electrodes, said one of the groups being positioned to one side of an end disc electrode.

Claim 5

A rotary electrostatic precipitator as claimed in claim 1, wherein said disc electrodes are journaled on a common shaft rotatable about said predetermined axis.

Claim 6

A rotary electrostatic precipitator as claimed in claim 1, wherein each disc electrode has applied on at least one of its faces a layer of a semi-conductor material.

Claim 7

A rotary electrostatic precipitator as claimed in claim 5, wherein the resistatance of the semi-conductor material is in the range of about 105 to 1011 ohms centimeter.

Claim 8

A rotary electrostatic precipitator as claimed in claim 1, wherein the dust removing means is formed as a chamber which communicates with said dust conveyor means.

Claim 9

A rotary electrostatic precipitator as claimed in claim 7, wherein the dust removing chamber is defined by said first and second means in form of first and second inclined plates, respectively, said first plate preventing flow of the gaseous stream into the chamber and said second plate being provided with scraper means for scraping dust particles from the dust collector means as it rotates past the scraper means.

Claim 10

A rotary electrostatic precipitator as claimed in claim 8, wherein the dust scraper means comprises a support arm affixed to the second means and a scraper blaDe flexibly supported by said support arm.

Claim 11

A rotary electrostatic precipitator comprising a housing providing with an inlet for receiving a dust laden gas stream under pressure and an outlet from which said gas stream issues substantially free of dust, an annular rotary dust collector means adapted for rotation about a predetermined axis and comprising a plurality of axially spaced apart disc electrodes within said housing and positioned in the path of the gas stream between said inlet and outlet, a plurality of radially extending electrical discharge means supported in spaced relation to said collector means and being adapted for connection together with the dust collector means to a source of electrical current for ionizing dust particles passing therebetween for collection by said dust collector means, first and second axially extending means at said inlet and said outlet ends of the precipitator, respectively, and positioned with respect to said inlet and outlet ends and said annular dust collector means to direct said gas stream from said inlet through a first zone, through which said dust collector means rotates in proximate spaced relation to said discharge means, toward said outlet, said first and second means defining a dust removal zone which is isolated from said first dust collecting zone, said first and second means comprising comb-shaped plates, each said disc electrodes being in part received within the spaces in said comb-shaped plates, said first and second plates being inclined relative to the axis of rotation of said dust collector means, the latter being carried for rotation by a rotary shaft, the free ends of the tooth-like projections of the comb-shaped plates being in alignment with the rotary shaft, said inclined side plates and rotary shaft forming a substantially triangular chamber which is isolated from said dust collecting zone, said dust collector means during rotation thereof rotating through said first dust collecting zone and simultaneously through said dust removal zone defined by said chamber, means on said second means in engagement with said dust collector means for removing dust from that part only of the dust collector means which passes through said chamber, and conveyor means below the dust removal zone and in communication therewith for conveying to waste dust from the dust removal zone.

Claim 12

A rotary electrostatic precipitator comprising a housing providing with an inlet for receiving a dust laden gas stream under pressure and an outlet from which said gas stream issues substantially free of dust, an annular rotary dust collector means adapted for rotation about a predetermined axis and comprising a plurality of axially spaced apart disc electrodes within said housing and positioned in the path of the gas stream between said inlet and outlet, a plurality of radially extending electrical discharge means supported in spaced relation to said collector means and being adapted for connection together with the dust collector means to a source of electrical current for ionizing dust particles passing therebetween for collection by said dust collector means, first and second axially extending means at said inlet and said outlet ends of the precipitator, respectively, and positioned with respect to said inlet and outlet ends and said annular dust collector means to direct said gas stream from said inlet through a first zone, through which said dust collector means rotates in proximate spaced relation to said discharge means, toward said outlet, said first and second means defining a dust removal zone which is isolated from said first dust collecting zone, said first and second means comprising comb-shaped plates, each said disc electrodes being in part received within the spaces in said comb-shaped plates, said first and second plates being inclined relative to the axis of rotation of said dust collector means, the latter being carried for rotation by a rotary shaft, the free ends of the tooth-like projections of the comb-shaped plates being in alignment with the rotary shaft, said inclined side plates and rotary shaft forming a substantially triangular chamber which is isolated from said dust collecting zone, said dust collector means during rotation thereof rotating through said first dust collecting zone and simultaneously through said dust removal zone defined by said chamber, means on said second means in engagement with said dust collector means for removing dust from that part only of the dust collector means which passes through said chamber, and conveyor means below the dust removal zone and in communication therewith for conveying to waste dust from the dust removal zone.