Electrostatic precipitator module and desulfurization system including the same

Patent metadata

Field	Value
Publication number	US-11198136-B2
Application number	US-201916706667-A
Country	US
Kind code	B2
Filing date	Dec 6, 2019
Priority date	Oct 4, 2018
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

An electrostatic precipitator module and a desulfurization system are capable of easily discharging wash water from a wet electrostatic precipitator module. The electrostatic precipitator module includes an arrangement of discharge electrodes and collecting electrodes alternately disposed and spaced apart from each other, the discharge electrodes configured to be charged to a predetermined voltage for generating a corona discharge between the discharge electrodes and the collecting electrodes; and tie rods for fixing the discharge electrodes and the collecting electrodes. Each collecting electrode has a lower edge inclined downward with respect to the ground. The lower edge of each collecting electrode includes separate lower edge portions respectively inclined downward from opposite side ends of the collecting electrode and a lowermost point at which wash water is concentrated and discharged to a discharge guide installed directly under the lowermost points. The discharge guide has a width substantially smaller than the collecting electrode.

First claim

What is claimed is:

1. A desulfurization system comprising:
an absorption tower having an exhaust inlet and an exhaust outlet;
a plurality of absorption solution supply pipes extending across the absorption tower, each absorption solution supply pipe having a spray nozzle;
an electrostatic precipitator module disposed on the absorption solution supply pipes and comprising a plurality of discharge and collecting electrodes erected and arranged in a height direction of the absorption tower; and
a wash water supply unit disposed on the electrostatic precipitator module,
wherein each of the collecting electrodes has a lower edge inclined downward with respect to a ground and a lowermost point at which wash water flowing down from the collecting electrode is concentrated.

2. The desulfurization system according to claim 1 , further comprising a discharge guide having a channel formed to receive the wash water and installed with respect to the lowermost point of each collecting electrode.

3. The desulfurization system according to claim 2 , wherein the discharge guide extends in a stacking direction of the collecting electrodes, and has a bottom surface that decreases in height toward either extreme of the discharge guide.

4. The desulfurization system according to claim 2 , wherein each collecting electrode has a fixing hole formed near the lower edge.

5. The desulfurization system according to claim 4 , further comprising:
a support hanger that extends in a stacking direction of collecting electrodes and is fitted to the lower edge of each collecting electrode;
a plurality of connection protrusions protruding upward from the support hanger, each connection protrusion having a support hole aligned with the fixing hole; and
a hanger fixing rod inserted into the fixing holes and the support holes,
wherein the discharge guide is fixed to the support hanger.

6. The desulfurization system according to claim 1 , further comprising a guide protrusion formed on a lower portion of each collecting electrode such that wash water flowing along surfaces of the collecting electrode is transferred toward the center of the collecting electrode, the guide protrusion extending in a width direction of the collecting electrode.

7. The desulfurization system according to claim 1 , further comprising:
a first reinforcing rod that is fixedly installed at and protrudes from a lower portion of each discharge electrode and is configured to be inserted into slots formed in first setting beams respectively disposed at opposite ends of the first reinforcing rod,
wherein the first setting beams are installed to pass through clearance grooves respectively formed in both ends of the lower side of each of the collecting electrodes.

8. The desulfurization system according to claim 7 , further comprising a second reinforcing rod that is fixedly installed at and protrudes from an upper portion of each collecting electrode and is configured to be inserted into slots formed in second setting beams respectively disposed at opposite ends of the second reinforcing rod.

9. The desulfurization system according to claim 1 , wherein the exhaust inlet and the exhaust outlet have a different shape.

10. The desulfurization system according to claim 9 , wherein the exhaust inlet has a tubular shape through which an exhaust gas generated by combustion of fuel consumed by a boiler is introduced and flows upward, and the exhaust outlet has a rectangular tube protruding laterally from an upper end of the absorption tower.

11. The desulfurization system according to claim 1 , wherein the absorption tower comprises a cylindrical section which has a circular cross-section, a rectangular column section which is disposed above the cylindrical section and has a rectangular cross-section, and an intermediate section which is disposed between the cylindrical section and the rectangular column section.

12. The desulfurization system according to claim 11 , wherein the intermediate section has a contoured structure which includes a lower end having a circular cross-section for communicating with the cylindrical section and an upper end having a rectangular cross-section for communicating with the rectangular column section.

13. The desulfurization system according to claim 1 , wherein the absorption solution supply pipes allow a limestone slurry, which is supplied to and stored in a lower portion of the absorption tower, to be pumped and transferred upward so that an absorption solution is sprayed as fine droplets through the spray nozzles.

14. The desulfurization system according to claim 13 , further comprising an agitator installed in the lower portion of the absorption tower to accelerate a reaction by stirring the limestone slurry.

15. The desulfurization system according to claim 11 , further comprising a perforated plate for blocking fine droplets installed above the absorption solution supply pipe.

16. The desulfurization system according to claim 15 , wherein the perforated plate is installed in the intermediate section.

17. The desulfurization system according to claim 1 , further comprising a frame assembly on which the electrostatic precipitator module plate is installed in the absorption tower.

18. The desulfurization system according to claim 17 , wherein the frame assembly comprises:
lower frames that extend in a stacking direction of the discharge and collecting electrodes and are supported by insulating connection members, the lower frames being charged to a predetermined high voltage, wherein the discharge electrodes is charged to the same high voltage through the lower frames; and
insulating connection members installed with respect to the lower frames, each insulating connection member being provided with a high-voltage terminal rod for applying the high voltage to the associated discharge electrodes and with a lower insulator for insulation from the high-voltage terminal rod, wherein the insulating connection members are inserted into a tubular girder that is formed in the same direction as the lower frame and is fixedly installed on an inner wall of the absorption tower.

19. The desulfurization system according to claim 18 , wherein the frame assembly comprises:
lower supports that are fixedly installed on the lower frames and are respectively disposed on both outer sides and at a center of the electrostatic precipitator module, each of the lower supports including side protruding portions located on the lower frames, lower protruding portions protruding downward to side surfaces of the lower frames, and a support bar; and
upper supports that are disposed in an upper side of the electrostatic precipitator module and are respectively disposed on both outer sides and at a center of the electrostatic precipitator module.

20. The desulfurization system according to claim 19 , wherein the frame assembly comprises locking members that are fixed to an inner wall of the absorption tower and are installed to press the upper support in an inward direction in order to reduce vibration of the electrostatic precipitator module.

Assignees

• Doosan Heavy Ind & Construction Co Ltd
• Doosan Heavy Ind & Construction C

Inventors

• Moon Sangchul
• Lee Jinwoon
• Lee Sangrin
• Yim Joonhyuk
• Hwang Jaedong

Classifications

• B03C3/41

  Ionising-electrodes · CPC title

• B03C3/88

  Cleaning-out collected particles · CPC title

• B01D53/508

  by treating the gases with solids · CPC title

• B01D2251/404

  of calcium · CPC title

• B03C3/16 Primary

  wet type · CPC title