US 3,958,961 AGranted

Wet electrostatic precipitators

AssigneeUnited States Filter Corporation

InventorEven Bakke

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Abstract

A wet electrostatic precipitator has an inlet diffuser, a transverse electrostatic discharge section, an extended discharge section, a mist eliminator section and an outlet section. The inlet diffuses includes discharge electrodes interposed between collection plates extending in the direction of flow of gaseous feed and water sprays. The transverse discharge section includes baffles transverse to the direction of flow of the gaseous feed and water sprays. The extended discharge section includes transverse baffles and electrodes. The outlet section following the mist eliminator includes overlapped baffles.

Claims11

Dependent claims

A wet electrostatic precipitator for use with a coal fired boiler having a flue gas outlet comprising, in combination, a housing having inlet and outlet openings;

electrostatic field section means in said housing including a plurality of spaced, substantially parallel collection plates extending in a flow direction along a flow path, a plurality of discharge electrodes interposed in the spaces between said collection plates, and means applying an electric potential between said collection plates and said electrodes;
a first plurality of relatively narrow and elongated baffles in said housing extending across said flow path in advance of said electrostatic field section means;
a second plurality of relatively narrow and elongated baffles in said housing extending across said flow path downstream of said electrostatic field section means, said first and second pluralities of baffles each being arranged in successive groups spaced along the flow path, each group being arranged in at least two successive rows, the lateral spacing between the baffles in each row of said first plurality of baffles being greater than the width of the baffles, the lateral spacing between baffles in each of said second plurality of baffles being equal to or less than the width of the baffles, successive rows of said first and second pluralities of baffles being staggered laterally relative to each other;
inlet means including said inlet opening and connected by said inlet opening to said flue gas outlet of a coal fired boiler and directing the flue gases, containing flyash and SO.sub.2 to be precipitated, to flow between said collection plates along a flow path within said housing;means directing continuous sprays of washing liquid into the spaces between and against said collection plates;
hopper means positioned below said electrostatic field section means and collecting therefrom a slurry formed of the washing liquid and the precipitated flyash and SO.sub.2, said housing having openings communicating with said hopper means;
clarifier means connected to said hopper means to receive the slurry therefrom;
means supplying neutralizing chemicals to said clarifier means;
said clarifier means separating the slurry into a sludge, containing the flyash, and a liquor;
and a recycle pump operable to recycle the liquid to said spray means as the washing liquid to increase the effectiveness of SO.sub.2 absorption by the washing liquid.

6 more elements

Dependencies are inferred from the claim text.

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Abstract

A wet electrostatic precipitator for use with a coal fired boiler having a flue gas outlet comprising, in combination, a housing having inlet and outlet openings;

electrostatic field section means in said housing including a plurality of spaced, substantially parallel collection plates extending in a flow direction along a flow path, a plurality of discharge electrodes interposed in the spaces between said collection plates, and means applying an electric potential between said collection plates and said electrodes;
a first plurality of relatively narrow and elongated baffles in said housing extending across said flow path in advance of said electrostatic field section means;
a second plurality of relatively narrow and elongated baffles in said housing extending across said flow path downstream of said electrostatic field section means, said first and second pluralities of baffles each being arranged in successive groups spaced along the flow path, each group being arranged in at least two successive rows, the lateral spacing between the baffles in each row of said first plurality of baffles being greater than the width of the baffles, the lateral spacing between baffles in each of said second plurality of baffles being equal to or less than the width of the baffles, successive rows of said first and second pluralities of baffles being staggered laterally relative to each other;
inlet means including said inlet opening and connected by said inlet opening to said flue gas outlet of a coal fired boiler and directing the flue gases, containing flyash and SO.sub.2 to be precipitated, to flow between said collection plates along a flow path within said housing;means directing continuous sprays of washing liquid into the spaces between and against said collection plates;
hopper means positioned below said electrostatic field section means and collecting therefrom a slurry formed of the washing liquid and the precipitated flyash and SO.sub.2, said housing having openings communicating with said hopper means;
clarifier means connected to said hopper means to receive the slurry therefrom;
means supplying neutralizing chemicals to said clarifier means;
said clarifier means separating the slurry into a sludge, containing the flyash, and a liquor;
and a recycle pump operable to recycle the liquid to said spray means as the washing liquid to increase the effectiveness of SO.sub.2 absorption by the washing liquid.

6 more elements