Rapping an electrostatic precipitator

Patent metadata

Field	Value
Publication number	US-9566588-B2
Application number	US-201414315499-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jan 26, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

For the sake of improving dust removal from an electrostatic precipitator by rapping, the present disclosure proposes an electrostatic precipitator, comprising a flue gas chamber, a collecting electrode, a first rapping arrangement that raps the collecting electrode, a dust hopper, and a second rapping arrangement that raps at least one of the dust hopper and an element located within the dust hopper, wherein the second rapping arrangement is located within an inner chamber defined by the flue gas chamber and the dust hopper. The rapping by means of the second rapping arrangement may comprise rapping at least one of an inner wall of the dust hopper, a structural element located within the dust hopper and connected to at least one inner wall of the dust hopper, a rapping plate located within the dust hopper proximate to an inner wall of the dust hopper, and a baffle located within the dust hopper.

First claim

The invention claimed is:

1. An electrostatic precipitator comprising:
a flue gas chamber;
a collecting electrode;
a first rapping arrangement that raps said collecting electrode, the first rapping arrangement comprising a hammer, a rotating shaft and a shock bar;
a dust hopper; and
a second rapping arrangement that raps at least one of said dust hopper and an element located within said dust hopper, the second rapping arrangement comprising a hammer, a rotating shaft and a shock bar, wherein said second rapping arrangement is located within both said flue gas chamber and said dust hopper, together defining an inner chamber.

2. The electrostatic precipitator of claim 1 ,
wherein the second rapping arrangement raps at least one of:
an inner wall of said dust hopper;
a structural element located within said dust hopper and connected to at least one inner wall of said dust hopper;
a rapping plate located within said dust hopper proximate to an inner wall of said dust hopper; and
a baffle located within said dust hopper.

3. The electrostatic precipitator of claim 1 further comprising a mechanical connection interconnecting said first rapping arrangement and said second rapping arrangement such that a driving of said first rapping arrangement effects a driving of said second rapping arrangement.

4. The electrostatic precipitator of claim 1 , wherein said first rapping arrangement comprises a rapping hammer mounted on a rotating shaft, and said second rapping arrangement comprises a rapping hammer mounted on a rotating shaft, for raps of the rapping hammers against the shock bars once per rotation of the rotating shafts.

5. The electrostatic precipitator of claim 1 , further comprising:
a first drive system that drives said first rapping arrangement;
a second drive system that drives said second rapping arrangement; and
a control system that controls said first drive system and said second drive system such that a driving of said first rapping arrangement and a driving of said second rapping arrangement occur at least in part simultaneously.

6. The electrostatic precipitator of claim 1 , wherein the shock bar of the second rapping arrangement is supported by a plurality of guides.

7. A method of modifying an electrostatic precipitator comprising a flue gas chamber, a collecting electrode, a first rapping arrangement that raps said collecting electrode, the first rapping arrangement comprising a hammer, a rotating shaft and a shock bar and a dust hopper, said method comprising:
equipping said electrostatic precipitator with a second rapping arrangement comprising a hammer, a rotating shaft and a shock bar, to rap at least one of said dust hopper and an element located within said dust hopper, wherein said second rapping arrangement is located within both said flue gas chamber and said dust hopper, together defining an inner chamber.

8. The method of claim 7 , wherein the second rapping arrangement raps at least one of:
an inner wall of said dust hopper;
a structural element located within said dust hopper and connected to at least one inner wall of said dust hopper;
a rapping plate located within said dust hopper proximate to an inner wall of said dust hopper; and
a baffle located within said dust hopper.

9. The method of claim 7 , further comprising:
equipping said electrostatic precipitator with a mechanical connection interconnecting said first rapping arrangement and said second rapping arrangement such that a driving of said first rapping arrangement effects a driving of said second rapping arrangement.

10. The method of claim 7 , wherein said first rapping arrangement comprises a rapping hammer mounted on a rotating shaft and said second rapping arrangement comprises a rapping hammer mounted on a rotating shaft, for raps of the rapping hammers against the shock bars once per rotation of the rotating shafts.

11. The method of claim 7 , wherein said electrostatic precipitator comprises a first drive system that drives said first rapping arrangement and a control system that controls said first drive system, said method further comprising:
equipping said electrostatic precipitator with a second drive system that drives said second rapping arrangement; and
configuring said control system to control said second drive system such that a driving of said first rapping arrangement and a driving of said second rapping arrangement occur at least in part simultaneously.

12. A method of rapping an electrostatic precipitator comprising a flue gas chamber, a collecting electrode, a first rapping arrangement comprising a hammer, a rotating shaft and a shock bar that raps said collecting electrode, and a dust hopper, said method comprising:
rapping, by means of a second rapping arrangement comprising a hammer, a rotating shaft and a shock bar located within both said flue gas chamber and said dust hopper, together defining an inner chamber, at least one of said dust hopper and an element located within said dust hopper.

13. The method of claim 12 , wherein said rapping by means of said second rapping arrangement comprises rapping at least one of:
an inner wall of said dust hopper;
a structural element located within said dust hopper and connected to at least one inner wall of said dust hopper;
a rapping plate located within said dust hopper proximate to an inner wall of said dust hopper; and
a baffle located within said dust hopper.

14. The method of claim 12 , wherein said first rapping arrangement comprises a rapping hammer mounted on a rotating shaft and said second rapping arrangement comprises a rapping hammer mounted on a rotating shaft, for raps of the rapping hammers against the shock bars once per rotation of the rotating shafts.

15. The method of claim 7 , wherein the shock bar of the second rapping arrangement is supported by a plurality of guides.

Assignees

• Alstom Technology Ltd
• General Electric Technology Gmbh

Inventors

• Malec Ireneusz

Classifications

• B03C3/76 Primary

  by using a mechanical vibrator, e.g. rapping gear {; by using impact} · CPC title

• B03C3/761 Primary

  Drive-transmitting devices therefor, e.g. insulated shafts · CPC title

• Y10T29/49826

  Assembling or joining · CPC title