Liquid film dust arrester and flue gas desulfurization system

Patent metadata

Field	Value
Publication number	US-10780386-B2
Application number	US-201615778111-A
Country	US
Kind code	B2
Filing date	Nov 29, 2016
Priority date	Dec 7, 2015
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

A liquid film dust arrester is installed to face a gas flow containing dust and flowing out from a gas discharge pipe. The arrester includes a gas flow blocking unit arranged vis-à-vis the gas flow, a liquid dispersion unit having a dispersion section arranged at a position near the center of the gas flow blocking unit and upstream relative to the gas flow blocking unit as viewed in the flowing direction of the gas flow so as to face the gas flow blocking unit, a liquid ejection unit having an ejection port disposed vis-à-vis the dispersion section and configured to eject liquid from the ejection port, and a liquid film forming unit. The dispersion section comprises a smooth surface that causes the ejected liquid to flow and disperse on the smooth surface, and the liquid film is formed to face the gas flow flowing through the flow path.

First claim

The invention claimed is:

1. A liquid film dust arrester configured to face a gas flow flowing out from a gas discharge pipe and to take dust in the gas flow into a liquid film in order to remove the dust from the gas flow, the dust arrester comprising:
a gas flow blocking unit arranged downstream from the gas discharge pipe in a direction of the gas flow;
a liquid dispersion unit having a dispersion section arranged at a position near the center of the gas flow blocking unit and upstream relative to the gas flow blocking unit as viewed in the flowing direction of the gas flow so as to face the gas flow blocking unit;
a liquid ejection unit having an ejection port disposed upstream of the dispersion section in a direction of a liquid flow and being configured to eject liquid from the ejection port; and
a liquid film forming unit configured to form the liquid film in the flow path of the gas flow between the gas flow blocking unit and the gas discharge pipe,
characterized in that the dispersion section comprises a smooth surface which operates to cause the liquid ejected from the ejection port toward the dispersion section to flow and disperse on the smooth surface and
that the liquid film is so formed as to face the gas flow flowing through the flow path.

2. The liquid film dust arrester according to claim 1 , characterized in that the dispersion section is n-fold symmetric, wherein n is an integer not smaller than 2, relative to the direction of ejection of the liquid from the ejection port.

3. The liquid film dust arrester according to claim 1 , characterized in that the smooth surface is a flat surface or has a convex shape toward the ejection port.

4. The liquid film dust arrester according to claim 1 , characterized in that the smooth surface is arranged perpendicularly relative to the direction of ejection of the liquid from the ejection port.

5. The liquid film dust arrester according to claim 1 , characterized in that the ratio of area S 1 of the ejection port to area S 2 of the smooth surface, or S 1 /S 2 , is not smaller than 0.001 and not greater than 0.06.

6. The liquid film dust arrester according to claim 1 , characterized in that the distance between the ejection port and the dispersion section is not less than 3 mm and not more than 50 mm.

7. A flue gas desulfurization system for removing sulfur oxides and dust from flue gas containing the sulfur oxides and the dust, the system comprising:
a sealed vessel, the inside of the sealed vessel being partitioned by a first partition board and a second partition board located above the first partition board into a first chamber, a second chamber arranged above and adjacent to the first chamber and a third chamber arranged above and adjacent to the second chamber;
a flue gas inlet to the second chamber;
a desulfurized gas outlet from the third chamber;
one or more through holes formed through the first partition board;
one or more flue gas dispersion pipes extending downwardly from the corresponding respective through holes to bring the first chamber and the second chamber into communication with each other so as to be able to disperse the flue gas fed into the second chamber into an absorber solution contained in the first chamber in order to absorb sulfur oxides from the dispersed flue gas;
one or more gas discharge pipes keeping the first chamber and the third chamber in communication with each other and having top ends thereof projected upward from the top surface of the second partition board; and
one or more liquid film dust arresters arranged so as to respectively face the gas flows flowing out upward from the corresponding gas discharge pipes and take the dust in the gas flows into a liquid film in order to remove the dust from the gas flows,
characterized in that at least one of the liquid film dust arresters is a liquid film dust arrester according to claim 1 .

8. The flue gas desulfurization system according to claim 7 , characterized in that the gas flow flowing out from the gas discharge pipe is desulfurized flue gas.

Assignees

• Chiyoda Corp

Inventors

• Kumagai Kazuya
• Yasuda Hirokazu
• Kurosaki Naobumi

Classifications

• B01F23/2132

  using nozzles · CPC title

• B01F23/213

  by spraying or atomising of the liquids · CPC title

• B01D2258/0283

  Flue gases · CPC title

• B01D2258/0291

  from waste incineration plants · CPC title

• B01D47/022 Primary

  by using a liquid curtain (B01D47/06 takes precedence) · CPC title