JP3550754B2 - Flue gas desulfurization equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a flue gas desulfurization device for removing sulfur oxides contained in exhaust gas.
[0002]
[Prior art]
An example of a conventional flue gas desulfurization apparatus will be described with reference to a longitudinal sectional view of FIG. 4. Absorbent liquid 2 is stored at the bottom of an absorption tower 1 and is stirred by a stirring blade 4 rotated by a motor 3. It has become so. Then, the absorption liquid 2 is sucked by the suction pump 5 and sent to the absorption liquid spray pipe 6 provided in a plurality of stages in the upper part of the absorption tower 1, and a number of pores formed in the absorption liquid spray pipe 6. From 7, it is sprayed into the inside of the absorption tower 1.
[0003]
An exhaust gas introduction duct 8 is attached to the side surface of the absorption tower 1 below the position where the absorption liquid spray pipe 6 is provided, and the absorption tower above the position where the absorption liquid spray pipe 6 is provided. A first-stage eliminator 9 is provided inside the whole of the absorption tower 1.
[0004]
The first-stage eliminator 9 is a filter formed of a thin plate having a rectangular shape in cross section and having a number of juxtaposed absorbent collecting elements 10 for removing the absorbent contained in the exhaust gas. The absorbing liquid removed from the exhaust gas by the first-stage eliminator 9 is dropped below the inside of the absorption tower 1.
[0005]
An exhaust gas outlet duct 11 is attached to an upper side surface of the absorption tower 1, and the exhaust gas outlet duct 11 extends downward outside the absorption tower 1 and reaches a discharge port (not shown) via a second-stage eliminator 12. .
[0006]
As shown in FIG. 5, the second-stage eliminator 12 is made of a thin plate having a cross-sectional shape having a higher refractive index than the above-mentioned absorbent liquid collecting element 10 and is configured to remove the absorbent contained in the exhaust gas. 13 is a filter-like structure in which a large number of 13 are arranged side by side more densely than the absorbent collecting elements 10 of the first-stage eliminator 9. The absorbent removed from the exhaust gas by the second-stage eliminator 12 is returned to the inside of the absorption tower 1 through the reflux pipe 14.
[0007]
In the above-mentioned conventional flue gas desulfurization apparatus, when the absorption liquid 2 is stirred by the stirring blade 4 and the suction pump 5 is operated, the absorption liquid 2 stored at the bottom of the absorption tower 1 is injected into the absorption liquid spray pipe 6. It is sprayed into the inside of the absorption tower 1 from the many fine holes 7 provided.
[0008]
In this state, when the exhaust gas to be desulfurized is introduced from the exhaust gas introduction duct 8 into the absorption tower 1, the absorption liquid 2 is sprayed from the absorption liquid spray pipe 6 to the exhaust gas rising inside the absorption tower 1, and sulfur oxidation in the exhaust gas is performed. The substance is absorbed by the absorbing liquid 2.
[0009]
When the exhaust gas further rises inside the absorption tower 1 and passes through the first-stage eliminator 9, most of the absorbent 2 contained in the exhaust gas is absorbed by the absorbent-collecting element of the first-stage eliminator 9. 10 and is removed from the exhaust gas.
[0010]
The exhaust gas from which most of the absorbing liquid 2 has been removed by the first-stage eliminator 9 enters the exhaust gas outlet duct 11 from the upper part of the absorption tower 1 and is guided to the second-stage eliminator 12. When passing through the second-stage eliminator 12, the absorbent 2 remaining in the exhaust gas adheres to the absorbent-collecting element 13 of the second-stage eliminator 12, is removed from the exhaust gas, and the exhaust gas is discharged to the outside. You.
[0011]
[Problems to be solved by the invention]
In the conventional flue gas desulfurization apparatus shown in FIG. 4 described above, the second-stage eliminator 12 is provided outside the absorption tower 1, the exhaust gas outlet duct 11 becomes long, and the equipment becomes large-scale. There was a drawback that hindered the operation.
[0012]
An object of the present invention is to provide a flue gas desulfurization apparatus which requires only a small space by eliminating the above-mentioned conventional drawbacks and making the second stage eliminator also integral with the absorption tower.
[0013]
[Means for Solving the Problems]
The present invention forms a truncated cone at the upper end of an absorption tower that absorbs and removes sulfur oxides in the exhaust gas by introducing the exhaust gas and spraying an absorbing solution on the exhaust gas, and the outer end is formed as a widened portion. An exhaust gas outlet duct is provided on the side surface of the truncated conical portion, and an absorbing liquid collecting element is provided on a widening portion of the exhaust gas outlet duct in a cross-sectional direction crossing the exhaust gas from the truncated conical portion to the outer end. A first aspect of the present invention relates to a flue gas desulfurization apparatus comprising: a first-stage eliminator arranged side by side; and a second-stage eliminator having an absorption liquid collecting element arranged side by side more densely than the first-stage eliminator, Further, the present invention relates to a flue gas desulfurization apparatus, wherein a plurality of exhaust gas outlet ducts having a first-stage eliminator and a second-stage eliminator are provided on a side surface of a truncated conical portion of the absorption tower.
[0014]
[Action]
In the present invention, the upper end of the absorption tower has a frusto-conical portion, and an exhaust gas outlet duct having a widened outer end is provided on the side surface of the frusto-conical portion. And the second-stage eliminator, the flow rate of the exhaust gas passing through the first-stage eliminator and the second-stage eliminator is reduced, and the absorbing liquid can be sufficiently removed by the first-stage eliminator and the second-stage eliminator. it can.
[0015]
Further, since a plurality of exhaust gas outlet ducts having the first-stage eliminator and the second-stage eliminator are provided on the side surface of the truncated conical portion of the absorption tower, the efficiency of removing the absorbent can be improved.
[0016]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a perspective view of one embodiment of the present invention, and FIG. 2 is a plan view of FIG. 1, in which a truncated conical portion 16 is formed at the upper end of an absorption tower 15 having a cylindrical shape. The side surface of the frusto-conical portion 16 has an inclination angle of about 60 ° with respect to the horizontal plane.
[0018]
An exhaust gas introduction duct 17 is provided on a side surface of the absorption tower 15, and a circulating spray pipe 18 is provided on another side surface of the absorption tower 15 above the exhaust gas introduction duct 17. In FIG. 4, a plurality of fine holes similar to the liquid spray tube 6 shown in FIG. 4 are connected to a plurality of liquid spray tubes.
[0019]
Exhaust gas outlet ducts 19 are respectively provided in two directions on the side surfaces of the truncated conical portion 16 formed at the upper end of the absorption tower 15. Since the exhaust gas outlet duct 19 is provided on the inclined side surface of the frusto-conical portion 16, the weight of the exhaust gas outlet duct 19 can be reduced even if a frame for supporting the exhaust gas outlet duct 19 is not particularly provided. It can be supported by the absorption tower 15 via the 16 inclined side surfaces.
[0020]
As shown in FIG. 2, both sides of the exhaust gas outlet duct 19 extend at an angle α of about 30 ° with respect to the horizontal center axis, and the outer end of the exhaust gas outlet duct 19 has a base end of the exhaust gas outlet duct 19. Is formed to have a cross-sectional area approximately twice as large as the cross-sectional area of.
[0021]
A first-stage eliminator 21 and a second-stage eliminator are provided inside a widening portion 20 formed at an outer end of the exhaust gas outlet duct 19 in a cross-sectional direction crossing the exhaust gas from the truncated conical portion 16 toward the outer end. 22 are attached.
[0022]
As shown in a plan view in FIG. 3, the first-stage eliminator 21 is formed of a thin plate having a rectangular shape in cross section, and has a filter in which a number of absorbent collecting elements 21a for removing the absorbent contained in the exhaust gas are arranged in parallel. The second-stage eliminator 22 is also made of a thin plate having a cross-sectional shape with a large number of refractions, and the absorption liquid collecting element 22a for removing the absorption liquid contained in the exhaust gas is denser than the first-stage eliminator 21. And a filter-shaped filter formed by arranging a number of filters in parallel.
[0023]
Next, the operation of the device shown in FIGS. 1 and 2 will be described.
[0024]
When the absorbing liquid is supplied from the outside of the absorption tower 15 to the circulation spray pipe 18, the absorbing liquid is sprayed into the absorption tower 15 from a plurality of unillustrated absorption liquid spray pipes inside the absorption tower 15.
[0025]
In this state, when the exhaust gas to be desulfurized is introduced into the absorption tower 15 from the exhaust gas introduction duct 17, the absorption liquid is sprayed on the exhaust gas rising inside the absorption tower 15, and the sulfur oxide in the exhaust gas is absorbed by the absorption liquid. You.
[0026]
After the exhaust gas from which the sulfur oxides have been removed rises inside the absorption tower 15, it turns horizontally from the frusto-conical portion 16 formed at the upper end of the absorption tower 15, and moves outward in the exhaust gas outlet duct 19. It flows toward the widening portion 20 at the end.
[0027]
Since the cross-sectional area of the expanding portion 20 is about twice as large as the cross-sectional area of the base end of the exhaust gas outlet duct 19, if the exhaust gas flows into the base end of the exhaust gas outlet duct 19 at a flow rate of, for example, 12 m / s, The flow rate of the exhaust gas when reaching the expanding portion 20 is half the flow rate of 6 m / sec.
[0028]
As described above, the exhaust gas has a low flow velocity and enters the expanding portion 20, and when passing through the first-stage eliminator 21, most of the absorbent contained in the exhaust gas is collected by the first-stage eliminator 21. It adheres to the element 21a and is removed from the exhaust gas.
[0029]
The exhaust gas from which most of the absorbing liquid has been removed by the first-stage eliminator 21 will subsequently pass through the second-stage eliminator 22, and the remaining absorbing liquid will be densely arranged in the second-stage eliminator 22. Is attached to the absorbent collecting element 22a and removed from the exhaust gas, and the exhaust gas is discharged to the outside.
[0030]
【The invention's effect】
According to the first aspect of the present invention, the upper end of the absorption tower has a truncated conical portion, and an exhaust gas outlet duct having a widened outer end is provided on a side surface of the frustoconical portion. Since the first-stage eliminator and the second-stage eliminator are attached, the flow rate of the exhaust gas passing through the first-stage eliminator and the second-stage eliminator is reduced, and the absorbing liquid is sufficiently removed by the first-stage eliminator and the second-stage eliminator. There is an effect that can be done.
[0031]
Further, since a plurality of exhaust gas outlet ducts having the first-stage eliminator and the second-stage eliminator are provided on the side surface of the truncated conical portion of the absorption tower, there is an effect that the absorption liquid removal efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of one embodiment of the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is a partially cutaway plan view of a widened portion of FIG. 1;
FIG. 4 is a longitudinal sectional view of a conventional device.
FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;
[Explanation of symbols]
15 Absorber Tower 16 Truncated Conical Portion 19 Exhaust Gas Outlet Duct 20 Expanding Portion 21 First Stage Eliminator 21a Absorbent Liquid Collection Element 22 Second Stage Eliminator 22a Absorbent Liquid Collection Element

Claims (2)

Exhaust gas outlet with a frustoconical portion formed at the upper end of an absorption tower that absorbs and removes sulfur oxides in the exhaust gas by introducing the exhaust gas and spraying an absorbing solution onto the exhaust gas, and the outer end becomes a widened portion A duct is provided on a side surface of the truncated conical portion, and an absorbing liquid collecting element is juxtaposed in a section of the exhaust gas outlet duct in a cross-sectional direction crossing the exhaust gas from the truncated cone to the outer end. A flue gas desulfurization apparatus comprising: a first-stage eliminator; and a second-stage eliminator in which absorption liquid collecting elements are arranged more closely than the first-stage eliminator. The flue gas desulfurization apparatus according to claim 1, wherein a plurality of exhaust gas outlet ducts having a first-stage eliminator and a second-stage eliminator are provided on a side surface of the truncated conical portion of the absorption tower.

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