JP3968830B2 - Absorption tower of flue gas desulfurization equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorption tower of a flue gas desulfurization apparatus.
[0002]
[Prior 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.
[0003]
FIG. 4 shows an example of an absorption tower of a conventional flue gas desulfurization apparatus. A slurry-like absorption liquid 3 containing an absorbent such as calcium carbonate is stored in a liquid reservoir 2 at the bottom in the absorption tower body 1. A plurality of spray pipes 4 extending in the horizontal direction are installed in a plurality of stages at a predetermined interval in the vertical direction at an upper position in the absorption tower body 1.
[0004]
The liquid reservoir 2 and the spray pipes 4 at each stage are connected via an absorbent supply pipe 5, and a part of the absorbent 3 from the liquid reservoir 2 is in the middle of the absorbent supply pipe 5. A circulation pump 6 is provided that pumps up the water and sprays it from the spray pipes 4 at each stage.
[0005]
In addition, a gas introduction port 8 for introducing exhaust gas 7 between the liquid reservoir 2 and the spray pipe 4 is provided on one lower side of the absorption tower body 1. On the other side of the upper part, a gas outlet 9 for discharging the exhaust gas 7 from which sulfur oxides are removed is provided.
[0006]
A part of the absorption liquid 3 is pumped up from the liquid reservoir 2 by the circulation pump 6 of FIG. 4 and sprayed from the spray pipes 4 at each stage. In this state, the exhaust gas 7 to be desulfurized is passed through the gas inlet 8 from the absorption tower 8 When introduced into the main body 1, the exhaust gas 7 ascends the inside of the absorption tower main body 1 and comes into contact with the absorbing liquid 3 sprayed from the spray pipes 4 at each stage to absorb the sulfur oxide into the absorbing liquid 3, It is discharged from the outlet 9.
[0007]
On the other hand, the absorbing liquid 3 sprayed from the spray pipe 4 and absorbing the sulfur oxide from the exhaust gas 7 is dropped into the liquid reservoir 2.
[0008]
The liquid reservoir 2 is provided with a stirring blade 11 that is driven to rotate by an electric motor 10, and an air supply pipe 13 that blows the oxidizing air 12 into the absorbing liquid 3. Calcium sulfite produced in the absorbing liquid 3 by absorbing the sulfur oxide from the exhaust gas 7 by rotating the stirring blade 11 while blowing the oxidizing air 12 from the supply pipe 13 and stirring the absorbing liquid 3. The gypsum is oxidized to produce stable gypsum (calcium sulfate), and the produced gypsum is extracted from a gypsum outlet (not shown) and collected.
[0009]
The absorbing liquid 3 sprayed from the spray pipe 4 has a function of absorbing and removing sulfur oxides in the exhaust gas 7 by contacting the exhaust gas 7 by descending in the absorption tower body 1 with most of the liquid droplets being fine droplets. As will be demonstrated, the absorbing liquid 3 ′ that collides with the inner wall surface 14 of the absorption tower body 1 flows downward along the inner wall surface 14 as shown in FIG. 4 and flows into the liquid reservoir 2 as it is.
[0010]
[Problems to be solved by the invention]
In the conventional absorption tower main body 1 shown in FIG. 4, a very large amount of the absorption liquid 3 ′ flows down along the inner wall surface 14 of the absorption tower main body 1 and flows into the liquid reservoir 2 as it is. It has become.
[0011]
Thus, most of the absorbing liquid 3 ′ that flows along the inner wall surface 14 of the absorption tower body 1 does not come into contact with the exhaust gas 7, that is, returns to the liquid reservoir 2 without being subjected to desulfurization. Therefore, the presence of a large amount of the absorbing liquid 3 ′ that cannot be subjected to such desulfurization causes a reduction in the absorption efficiency of the sulfur oxide in the absorption tower.
[0012]
The present invention has been made in view of the above circumstances, and improves the absorption efficiency of sulfur oxides by collecting the absorption liquid flowing down along the inner wall surface of the absorption tower body and bringing it into contact with the exhaust gas. An object of the present invention is to provide an absorption tower of a flue gas desulfurization apparatus that can perform the above-mentioned.
[0013]
[Means for Solving the Problems]
In the first aspect of the present invention, the absorption liquid is pumped up from the liquid reservoir at the bottom of the absorption tower body and sprayed from above, and the absorption liquid is introduced from the lower gas inlet during the fall and is discharged from the upper gas outlet. An absorption tower of a flue gas desulfurization device that is brought into contact with exhausted exhaust gas to absorb sulfur oxide and return it to the liquid reservoir, and a liquid collection tank provided above the gas inlet, A nozzle provided to inject the absorption liquid in the liquid collection tank into the inside of the gas introduction port, and an absorption liquid that is provided on the inner wall surface of the absorption tower body and flows down the inner wall surface is guided to the liquid collection tank. A collecting rail on the front side, the collecting rail provided horizontally along the upper opening of the collecting tank with respect to the inner wall surface on the front side of the absorption tower body, and the absorption tower body Toward the front liquid collection rail The side collection rail on the side of the slope and the rear inner wall surface on the rear side of the absorption tower body are higher in the middle and both ends are inclined downward toward the rear end where the side collection rail is higher. The present invention relates to an absorption tower of a flue gas desulfurization apparatus, characterized in that it comprises a later-collected collection rail having the above.
[0014]
The invention described in claim 2 is provided with a liquid collection tank at the upper part of the gas introduction port, and a liquid feed pump for supplying the absorption liquid in the liquid collection tank to a nozzle provided at the upper part of the gas introduction port. It concerns on the absorption tower of the flue gas desulfurization apparatus of Claim 1 characterized by these.
[0015]
In the first aspect of the invention, the absorption liquid that has hardly been used for absorption and removal of sulfur oxide by flowing along the inner wall surface of the absorption tower main body and flowing into the liquid reservoir is used as the liquid collection rail. In order to absorb and remove sulfur oxides by contacting with the exhaust gas by being ejected from the nozzle through the liquid collection tank, so that the absorbent circulated by the circulation pump can be used effectively. Therefore, the absorption efficiency of sulfur oxide in the absorption tower body can be increased.
[0016]
In 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 feeding pump, the pressure of the absorbing liquid supplied to the nozzle is increased so that good spraying is performed. Therefore, the effect of recovering sulfur oxide in the exhaust gas can be further enhanced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
FIGS. 1 and 2 show an example of an embodiment for carrying out the invention described in claim 1, and the portions denoted by the same reference numerals as those in FIG. 4 represent the same items.
[0019]
In the absorption tower main body 1 of the flue gas desulfurization apparatus configured substantially the same as that shown in FIG. 4, as shown in FIGS. 1 and 2, a collection extending across the width direction of the absorption tower main body 1 above the gas inlet 8. A liquid tank 15 is provided, and a nozzle 16 is provided so as to inject the absorbing liquid 3 ′ of the liquid collection tank 15 through the ceiling of the gas inlet 8 into the gas inlet 8.
[0020]
Further, the inner wall surface 14 of the absorption tower body is provided with a liquid collection rail 17 that collects the absorbent 3 ′ flowing down along the inner wall surface 14 and guides it to the liquid collection tank 15.
[0021]
1 and 2, the front inner wall surface 14a is provided with a horizontal liquid collection rail 17a along the upper opening 15a of the liquid collection tank 15, and the left and right inner wall surfaces 14b and 14c are provided with the above-mentioned liquid collection rail. Liquid collecting rails 17b and 17c inclined downward toward the liquid rail 17a are provided, and the inner wall surface 14d on the rear side has a high middle portion and both ends thereof are disposed on the liquid collecting rails 17b, 17b as shown in FIG. A liquid collection rail 17d having a downward slope toward the rear end portion where the height 17c is increased is provided. In the figure, reference numeral 18 denotes an inclined surface in which the bottom is formed in a downward slope toward the liquid reservoir 2 at the lower position of the nozzle 16 in the gas inlet 8.
[0022]
Next, the operation of the above embodiment will be described.
[0023]
The absorption liquid 3 sprayed from the spray pipe 4 by the action of the circulation pump 6 descends in the absorption tower main body 1 in the form of fine droplets, and comes into contact with the exhaust gas 7 to remove the sulfur oxide in the exhaust gas 7. It falls into the liquid pool 2 while exhibiting the action of absorbing and removing.
[0024]
On the other hand, the absorbing liquid 3 ′ colliding with the inner wall surface 14 of the absorption tower body 1 flows downward along the inner wall surface 14.
[0025]
The absorbing liquid 3 ′ flowing down along the inner wall surface 14 is collected by flowing into the liquid collecting rails 17 a, 17 b, 17 c, 17 d provided on the inner wall surface 14 of the absorption tower body 1, and is collected in the liquid collecting rail 17. The collected absorption liquid 3 ′ is collected in the liquid collection tank 15.
[0026]
The absorbing liquid 3 ′ collected in the liquid collecting tank 15 is injected into the gas inlet 8 from the nozzle 16 due to the water head pressure, and the absorbing liquid 3 ′ thus injected from the nozzle 16 is After contacted with the exhaust gas 7 flowing in the gas inlet 8 and subjected to a reaction for absorbing and removing sulfur oxides in the exhaust gas 7, it flows along the inclined surface 18 and flows into the liquid reservoir 2.
[0027]
As described above, the absorption liquid 3 ′ that has hardly been used for absorption and removal of sulfur oxide by flowing along the inner wall surface 14 of the absorption tower body 1 and flowing into the liquid pool portion 2, is collected in the collection rail 17. In this case, the absorbent 3 that is circulated by the circulation pump 6 is effective by being contacted with the exhaust gas 7 by being sprayed from the nozzle 16 through the liquid collection tank 15 and used for absorbing and removing sulfur oxides. Therefore, the absorption efficiency of sulfur oxide in the absorption tower body 1 can be increased.
[0028]
3 shows an example of an embodiment for carrying out the invention described in claim 2. As shown in the embodiment of FIGS. 1 and 2, a liquid collection tank 15 is provided above the gas inlet 8, and The absorption liquid 3 ′ collected by the liquid collection rail 17 is connected so as to be guided to the liquid collection tank 15, and the absorption liquid 3 ′ collected in the liquid collection tank 15 is provided above the gas inlet 8. A liquid feed pump 19 that is supplied to the nozzle 16 is provided. 20a shows a liquid absorption pipe | tube and 20b shows a liquid feeding pipe | tube.
[0029]
According to the embodiment of FIG. 3, the absorption liquid 3 ′ collected in the liquid collection tank 15 is supplied to the nozzle 16 by the liquid feed pump 19, so the pressure of the absorption liquid 3 ′ supplied to the nozzle 16 Can be improved and good spraying can be performed, so that the effect of recovering sulfur oxides in the exhaust gas 7 can be further enhanced.
[0030]
In addition, the absorption tower of the flue gas desulfurization apparatus of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.
[0031]
【The invention's effect】
According to the first aspect of the present invention, the absorption liquid that has hardly been used for absorption 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. Since it is collected by the liquid rail and sprayed from the nozzle through the liquid collection tank, it is brought into contact with the exhaust gas to be used for absorption removal of sulfur oxides, so the absorbing liquid circulated by the circulation pump is effectively used. Accordingly, there is an effect that the absorption efficiency of sulfur oxide in the absorption tower body can be increased.
[0032]
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 feeding pump, the pressure of the absorbing liquid supplied to the nozzle is increased and good spraying is performed. Therefore, there is an effect that the effect of recovering sulfur oxide in the exhaust gas can be further enhanced.
[Brief description of the drawings]
FIG. 1 is a cut side view showing an example of an embodiment for carrying out the invention according to claim 1;
FIG. 2 is a view taken in the direction of arrows II-II in FIG.
FIG. 3 is a cut side view showing an example of an embodiment for carrying out the invention according to claim 2;
FIG. 4 is a schematic cut side view showing an absorption tower of a conventional flue gas desulfurization apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Absorption tower main body 2 Liquid reservoir part 3 Absorbing liquid 3 'Absorbing liquid 7 Exhaust gas 8 Gas inlet 9 Gas outlet 14 Inner wall surface 15 Liquid collecting tank 16 Nozzle 17 Liquid collecting rail 19 Liquid feed pump

Claims (2)

The absorption liquid is pumped up from the liquid reservoir at the bottom of the absorption tower body and sprayed from above, and the absorption liquid is introduced from the lower gas introduction port during the fall and brought into contact with the exhaust gas derived from the upper gas outlet port to form sulfur. An absorption tower of a flue gas desulfurization apparatus that absorbs oxides and returns them to the liquid reservoir, a liquid collection tank provided above the gas inlet, and an absorption liquid in the liquid collection tank as the gas A nozzle provided so as to inject into the introduction port; and a liquid collection rail provided on the inner wall surface of the absorption tower body so as to guide the absorption liquid flowing down the inner wall surface to the liquid collection tank. The liquid collection rail is disposed horizontally with respect to the front inner wall surface of the absorption tower body along the upper opening of the liquid collection tank, and the left and right inner wall surfaces of the absorption tower body. Side collection with a downward slope toward the front collection rail And a collection liquid of a later measurement having a descending slope toward the rear end part where the middle part is higher than the inner wall on the rear side of the absorption tower main body and both ends are higher in the side liquid collection rail An absorption tower of a flue gas desulfurization apparatus comprising a rail . The liquid supply tank is provided in the upper part of the gas inlet, and the liquid feed pump which supplies the absorption liquid in this liquid tank to the nozzle provided in the upper part of the gas inlet is provided. Absorption tower of flue gas desulfurization equipment.

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