JPH1133352A - Absorption tower of flue gas desulfurization unit - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the efficiency of sulfur oxide absorption by collecting an absorbing liquid flowing down the inner wall surface of an absorption tower main body and bringing the absorbing liquid into contact with exhaust gas. SOLUTION: Absorbing liquid 3 is pumped up from a liquid reservoir 2 at the bottom of an absorbing tower body 1 and sprayed from above, and the absorbing liquid 3 is introduced from a lower gas inlet 8 during a fall and from an upper gas outlet 9 during falling. An absorption tower of a flue gas desulfurization device that is brought into contact with the discharged exhaust gas 7 to absorb the sulfur oxides and return the sulfur oxides to the liquid pool portion 2, and a liquid collection tank 15 provided above the gas inlet 8; A nozzle 16 provided to inject the absorbing solution 3 ′ of the liquid collecting tank 15 into the gas inlet 8, and the absorbing solution 3 flowing down the inner wall surface 14 provided on the inner wall surface 14 of the absorption tower body 1. And a liquid collecting rail 17 for guiding the ′ to the liquid collecting tank 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption tower for a flue gas desulfurization unit.

[0002]

2. Description of the Related Art Conventionally, a wet type flue gas desulfurization apparatus is known as one of apparatuses for removing sulfur oxides contained in exhaust gas from combustion equipment such as a boiler.

FIG. 4 shows an example of an absorption tower of a conventional flue gas desulfurization device. A slurry-like absorption liquid 3 containing an absorbent such as calcium carbonate is stored in a liquid reservoir 2 at the bottom in an absorption tower main body 1. A plurality of spray pipes 4 extending in the horizontal direction are provided in multiple stages at required intervals in the vertical direction at an upper position in the absorption tower main body 1.

The liquid reservoir 2 and the spray pipes 4 of the respective stages are connected via an absorbing liquid supply pipe 5. A circulating pump 6 is provided for pumping up a part of the water and spraying it from the spray pipes 4 of each stage.

Further, on one side of the lower part of the absorption tower main body 1,
A gas inlet 8 for introducing exhaust gas 7 is provided between the liquid reservoir 2 and the spray pipe 4, and an exhaust gas 7 from which sulfur oxides have been removed is provided on the other upper side of the absorption tower main body 1. Is provided with a gas outlet 9 for discharging gas.

[0006] A part of the absorbing liquid 3 is pumped up from the liquid reservoir 2 by the circulating pump 6 in FIG. 4 and sprayed from the spray pipes 4 of each stage. When the exhaust gas 7 is introduced into the absorption tower body 1 from above, the exhaust gas 7 comes into contact with the absorption liquid 3 sprayed from the spray pipes 4 of each stage while ascending the inside of the absorption tower body 1 and the sulfur oxide is absorbed by the absorption liquid 3. Are discharged from the gas outlet 9.

On the other hand, the absorbent 3 sprayed from the spray pipe 4 and having absorbed sulfur oxides from the exhaust gas 7
To be dropped.

The liquid reservoir 2 is provided with a stirring blade 11 rotatably driven by an electric motor 10 and an air supply pipe 13 for blowing oxidizing air 12 into the absorbing liquid 3. By stirring the absorbing liquid 3 by rotating the stirring blade 11 while blowing the oxidizing air 12 from the air supply pipe 13, the absorbing oxide 3 is generated in the absorbing liquid 3 by absorbing sulfur oxides from the exhaust gas 7. Stable gypsum (calcium sulfate) is generated by oxidizing calcium sulfite, and the generated gypsum is extracted from a gypsum outlet (not shown) and collected.

The absorbing liquid 3 sprayed from the spray pipe 4
Although most of the liquid droplets descend in the absorption tower main body 1 as fine droplets, they come into contact with the exhaust gas 7 and exhibit an action of absorbing and removing sulfur oxides in the exhaust gas 7. The absorbing liquid 3 ′ that has collided with the inner wall surface 14 flows downward along the inner wall surface 14 as shown in FIG. 4 and flows into the liquid reservoir 2 as it is.

[0010]

In the conventional absorption tower main body 1 shown in FIG.
, The absorption liquid 3 ′ flowing downward and flowing into the liquid pool 2 as it is becomes a very large amount.

Most of the absorbing liquid 3 ′ flowing along the inner wall surface 14 of the absorption tower main body 1 does not come into contact with the exhaust gas 7, that is, enters the liquid collecting section 2 without being subjected to desulfurization. The large amount of the absorbing liquid 3 'which is not subjected to such desulfurization causes the absorption efficiency of the absorption tower to be reduced.

The present invention has been made in view of the above-mentioned circumstances, and the absorption efficiency of sulfur oxides is reduced by collecting the absorbing liquid flowing down the inner wall surface of the absorption tower body and bringing the absorbing liquid into contact with the exhaust gas. It is an object of the present invention to provide an absorption tower of a flue gas desulfurization device capable of increasing the gas absorption.

[0013]

According to the first aspect of the present invention, the absorbing liquid is pumped from a liquid reservoir at the bottom of the absorption tower main body and sprayed from above, and the absorbing liquid is dropped from a lower gas inlet while falling. An absorption tower of a flue gas desulfurization device which is brought into contact with exhaust gas led out from an upper gas outlet to absorb sulfur oxides and return to the liquid pool part,
A liquid collecting tank provided above the gas inlet, a nozzle provided to inject the absorbing liquid in the liquid collecting tank into the gas inlet, and an inner wall provided on the inner wall of the absorption tower main body. And a collecting rail for guiding the absorbing liquid flowing down to the collecting tank.

According to a second aspect of the present invention, there is provided a liquid supply pump provided with a liquid collecting tank above the gas inlet, and supplying the absorbing liquid in the liquid collecting tank to a nozzle provided above the gas inlet. 2. The absorption tower according to claim 1, wherein the absorption tower is provided.

According to the first aspect of the present invention, the absorption liquid that has been hardly used for absorbing and removing sulfur oxides by flowing along the inner wall surface of the absorption tower main body and flowing into the liquid reservoir is conventionally used. It is collected by the collecting rail and is injected from the nozzle through the collecting tank to make contact with exhaust gas for absorption and removal of sulfur oxides, so that the absorbing liquid circulated by the circulation pump is used effectively. Therefore, the absorption efficiency of sulfur oxides in the absorption tower main body can be increased.

According to the second aspect of the present invention, since the absorbing liquid collected in the liquid collecting tank is supplied to the nozzle by the liquid sending pump, the pressure of the absorbing liquid supplied to the nozzle is increased to improve the spraying. Can be performed, whereby the effect of recovering sulfur oxides in the exhaust gas can be further enhanced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the first aspect of the present invention. The same reference numerals as in FIG. 4 denote the same parts.

In the absorption tower main body 1 of the flue gas desulfurization apparatus constructed substantially in the same manner as in FIG. 4 described above, as shown in FIGS. A liquid collecting tank 15 is provided which extends to extend through the ceiling of the gas inlet 8 and is injected into the gas inlet 8.

Further, the inner wall surface 14 of the main body of the absorption tower is provided with a collecting rail 17 for recovering the absorbing liquid 3 ′ flowing down along the inner wall surface 14 and guiding it to the collecting tank 15. .

1 and 2, the front inner wall surface 14a
Is provided with a horizontal liquid collecting rail 17a along the upper opening 15a of the liquid collecting tank 15;
The b and 14c are provided with collecting rails 17b and 17c which are inclined downward toward the collecting rail 17a, and the rear inner wall surface 14d has a high middle portion and both ends as shown in FIG. Are provided with a liquid collecting rail 17d having a downward slope toward the higher rear end of the liquid collecting rails 17b and 17c. In the figure, reference numeral 18 denotes an inclined surface formed at the gas inlet 8 at a position below the nozzle 16, with the bottom formed with a downward slope toward the liquid reservoir 2.

Next, the operation of the above embodiment will be described.

The spray pipe 4 is operated by the circulation pump 6.
The liquid 3, which is sprayed from the liquid, descends inside the absorption tower main body 1 with most of the liquid droplets being in fine contact with the exhaust gas 7 to exhibit the effect of absorbing and removing sulfur oxides in the exhaust gas 7 It falls into pool part 2.

On the other hand, the absorbing liquid 3 ′ colliding with the inner wall surface 14 of the absorption tower main body 1 flows downward along the inner wall surface 14.

The absorbing liquid 3 ′ flowing down the inner wall surface 14 is recovered by flowing into the collecting rails 17 a, 17 b, 17 c, 17 d provided on the inner wall surface 14 of the absorption tower main body 1. The absorbing liquid 3 ′ collected on the rail 17 is collected in the collecting tank 15.

The absorbing solution 3 'collected in the collecting tank 15
Is injected from the nozzle 16 into the gas inlet 8 by the water head pressure.
Liquid 3 ′ sprayed from the exhaust gas 7 is subjected to a reaction for absorbing and removing sulfur oxides in the exhaust gas 7 by contact with the exhaust gas 7 flowing in the gas inlet 8, and then flows along the inclined surface 18. And flows into the liquid reservoir 2.

As described above, the absorption liquid 3 ', which has been hardly used for absorbing and removing sulfur oxides by flowing along the inner wall surface 14 of the absorption tower main body 1 and flowing into the liquid storage section 2, is collected. The absorption liquid circulated by the circulation pump 6 by being collected by the liquid rail 17 and being injected from the nozzle 16 through the collection tank 15 to be brought into contact with the exhaust gas 7 to be subjected to absorption and removal of sulfur oxides 3 works effectively, and the absorption efficiency of sulfur oxides in the absorption tower main body 1 can be increased.

FIG. 3 shows an embodiment of the present invention according to the second aspect. As shown in FIGS. 1 and 2, a liquid collecting tank 15 is provided above the gas inlet 8. The absorbing liquid 3 ′ collected by the collecting rail 17 is connected to the collecting tank 15 so as to be guided to the collecting tank 15, and the absorbing liquid 3 ′ collected in the collecting tank 15 is placed above the gas inlet 8. A liquid feed pump 19 is provided to supply the liquid to the nozzle 16 provided. Reference numeral 20a denotes a liquid absorbing tube, and 20b denotes a liquid sending tube.

According to the embodiment shown in FIG.
Since the absorbing liquid 3 ′ collected in 5 is supplied to the nozzle 16 by the liquid sending pump 19, it is possible to increase the pressure of the absorbing liquid 3 ′ supplied to the nozzle 16 and perform good spraying. Therefore, the effect of recovering the sulfur oxides in the exhaust gas 7 can be further enhanced.

Incidentally, the absorption tower of the flue gas desulfurization apparatus of the present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention. .

[0031]

According to the first aspect of the present invention,
The absorbing liquid, which has hardly been used for absorption and removal of sulfur oxides by flowing along the inner wall surface of the absorption tower main body and flowing into the liquid reservoir, is collected by a collecting rail, and the nozzle is collected through a collecting tank. The absorption liquid circulated by the circulating pump can be effectively used because it is made to come into contact with the exhaust gas to be used for absorption and removal of the sulfur oxides by being injected from the exhaust pipe. This has the effect of increasing the absorption efficiency of water.

According to the second aspect of the present invention, since the absorbing liquid collected in the liquid collecting tank is supplied to the nozzle by the liquid sending pump, the pressure of the absorbing liquid supplied to the nozzle can be increased to improve the pressure. Therefore, there is an effect that the effect of recovering sulfur oxides in the exhaust gas can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a cut-away side view showing an example of an embodiment for carrying out the invention described in claim 1;

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a cut-away side view showing an example of an embodiment for carrying out the invention described in claim 2;

FIG. 4 is a schematic sectional side view showing an absorption tower of a conventional flue gas desulfurization device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorption tower main body 2 Liquid storage part 3 Absorption liquid 3 'Absorption liquid 7 Exhaust gas 8 Gas introduction port 9 Gas outlet 14 Inner wall surface 15 Collection tank 16 Nozzle 17 Collection rail 19 Liquid supply pump

Claims (2)

[Claims] 1. An exhaust gas which is pumped from a liquid reservoir at the bottom of an absorption tower main body and sprayed from above, and which is introduced from a lower gas inlet during the fall and discharged from an upper gas outlet. An absorption tower of a flue gas desulfurization device that absorbs sulfur oxides by contacting with the liquid reservoir and returns the liquid to the liquid reservoir, and a liquid collection tank provided above the gas inlet.
A nozzle provided to inject the absorbing liquid in the liquid collecting tank into the gas inlet, and an absorbing liquid flowing down the inner wall surface provided on the inner wall surface of the absorption tower main body. An absorption tower for a flue gas desulfurization unit, comprising: a collection rail adapted to be guided. 2. A liquid collecting tank is provided above the gas inlet,
The absorption tower of a flue gas desulfurization device according to claim 1, further comprising a liquid feed pump that supplies an absorption liquid in the liquid collection tank to a nozzle provided above a gas inlet.