JP7022818B2 - Desulfurization equipment - Google Patents

Description

The present invention relates to a wet desulfurization apparatus that sprays an absorbing liquid on exhaust gas to perform desulfurization.

Since the exhaust gas emitted from thermal power plants and the like contains a large amount of sulfur oxides, which are air pollutants, it is necessary to reduce the sulfur oxide content to a certain level before discharging it to the outside. In medium-sized or larger thermal power plants, it is common to use a wet desulfurization device that sprays an absorbent liquid such as an absorbent slurry on the exhaust gas as a device for removing (desulfurizing) sulfur oxides from the exhaust gas.

In the absorption tower where the absorption liquid is sprayed, the exhaust gas flows upward in the upflow section, then reverses and flows downward in the downflow section. If the flow of exhaust gas is disturbed during this reversal, the pressure loss in the absorption tower increases. Therefore, Patent Document 1 and Patent Document 2 propose a desulfurization apparatus provided with a guide vane for guiding the exhaust gas inside the absorption tower so that the turbulence of the exhaust gas flow at the time of reversal can be suppressed.

Japanese Unexamined Patent Publication No. 2000-15050 Japanese Unexamined Patent Publication No. 2002-219330

When the absorption liquid is sprayed in the absorption tower, the solid matter in the sprayed absorption liquid is deposited and the gypsum scale adheres to the inside of the absorption tower. In particular, when the absorption tower is provided with a guide vane, the gypsum scale adheres to the tip portion of the guide vane, and the gypsum scale further adheres to the adhered gypsum scale. That is, the tip portion of the guide vane corresponding to the inverted portion has a feature that the gypsum scale is likely to increase as compared with the other portions. If the increased gypsum scale falls and is sucked into the circulation pump, the spray nozzle may be blocked or the circulation pump may be damaged.

The present invention has been made in view of the above circumstances, and provides a desulfurization apparatus capable of suppressing the pressure loss of exhaust gas in the absorption tower and suppressing the increase in gypsum scale at the inversion portion. It is an object.

The desulfurization apparatus according to one aspect of the present invention includes an absorption tower having an air flow area in which exhaust gas flows, a plurality of spray nozzles for spraying an absorption liquid in the air flow area, and a ceiling of the absorption tower inside the absorption tower. The partition plate is provided so as to be separated from the section and divides the airflow area of the absorption tower into an upflow section in which the exhaust gas flows upward and a downflow section in which the exhaust gas flows downward. The plate has a guide portion at the upper end portion, and the guide portion is configured to guide the exhaust gas by flowing the exhaust gas from the upflow portion to the downflow portion along the outer peripheral surface of the guide portion. Moreover, it has a shape in which the outer peripheral surface is closed in a cross-sectional view.

According to this configuration, the exhaust gas from the upflow section to the downflow section can be appropriately guided by the guide section provided at the upper end portion of the partition plate. As a result, the turbulence of the exhaust gas flow in the absorption tower can be suppressed, and the pressure loss in the absorption tower can be suppressed. Further, the guide portion has a shape in which the outer peripheral surface is closed in a cross-sectional view, and does not have a tip portion where the gypsum scale is likely to increase. Therefore, it is possible to suppress an increase in the gypsum scale at the guide portion corresponding to the inverted portion.

In the above desulfurization apparatus, the guide portion may be formed of a circular tube member.

According to this configuration, since the guide portion is formed by the circular tube member, the partition plate having the guide portion can be easily formed.

In the desulfurization device, the absorption tower has a storage area for storing the absorption liquid sprayed from the plurality of spray nozzles, and the desulfurization device pumps the absorption liquid from the storage area and supplies it to the guide portion. A pump and a plurality of spray subheaders for supplying an absorption liquid to the plurality of spray nozzles are provided, and the guide unit distributes the absorption liquid supplied from the circulation pump to the plurality of spray subheaders. It may be configured to function as a spray main header that supplies the absorbing liquid to the plurality of spray nozzles.

According to this configuration, the guide portion also functions as a spray main header (pipe) that supplies the absorption liquid to the spray sub-header and the spray nozzle, so that the originally required spray main header can be omitted, resulting in desulfurization. The configuration of the device can be simplified.

In the desulfurization apparatus, the guide portion is configured to supply an absorbent liquid to the proximal end portion, and the plurality of spray subheaders are arranged in the longitudinal direction from the proximal end portion to the distal end portion of the guide portion. The guide portions are connected in order, and the guide portions may be formed by connecting a plurality of circular tube members having different inner diameters in order of decreasing inner diameter from the proximal end portion to the distal end portion.

In this configuration, the absorbent liquid is sequentially supplied to the spray subheaders arranged in the longitudinal direction from the base end portion to the tip portion of the guide portion, so that the absorbent liquid supplied to the base end portion of the guide portion is supplied to the tip portion. It gradually decreases as you go. Therefore, in the above desulfurization apparatus, the inner diameter of the guide portion is configured to become smaller toward the tip portion. According to this configuration, the flow rate of the absorbing liquid supplied to the spray subheader can be maintained even if the flow rate of the absorbing liquid is reduced at the tip portion.

According to the above-mentioned desulfurization apparatus, it is possible to provide a desulfurization apparatus capable of suppressing the pressure loss of the exhaust gas in the absorption tower and suppressing the increase of the gypsum scale in the inversion portion.

FIG. 1 is a schematic view of a desulfurization apparatus according to the first embodiment. FIG. 2 is a schematic view of the desulfurization apparatus according to the second embodiment. FIG. 3 is a horizontal cross-sectional view of the absorption tower shown in FIG.

(First Embodiment)
First, the desulfurization apparatus 100 according to the first embodiment will be described. FIG. 1 is a schematic view of a desulfurization apparatus 100 according to the present embodiment. The desulfurization device 100 is a device that desulfurizes the exhaust gas by spraying the absorbing liquid 101 on the exhaust gas. As shown in FIG. 1, the desulfurization apparatus 100 includes an absorption tower 10, a partition plate 20, a spray nozzle 30, a spray subheader 40, and a circulation pump 50. Hereinafter, these components will be described in order.

The absorption tower 10 has a cylindrical side wall 11, a dome-shaped ceiling portion 12 located above the side wall 11, and a disk-shaped bottom portion 13 located below the side wall 11. The absorption tower 10 of the present embodiment is configured as described above, but the shape of the absorption tower 10 is not limited to the above. For example, the side wall 11 may be formed in a square cylinder shape, and the absorption tower 10 may be formed in a rectangular shape in a horizontal cross-sectional view.

The absorption tower 10 has an air flow area 14 and a storage area 15 inside. The airflow region 14 is a region through which exhaust gas flows, and is partitioned into an upflow section 16 and a downflow section 17 by a partition plate 20. As shown by the white arrows in FIG. 1, the exhaust gas is supplied from the inlet duct 18 to the airflow area 14, and the exhaust gas supplied from the inlet duct 18 flows upward through the upflow section 16 and then reverses. It flows downward through the downflow section 17 and is discharged through the outlet duct 19. Further, the storage area 15 is located below the air flow area 14, and is a region for receiving and storing the absorbing liquid 101 sprayed from the spray nozzle 30.

The partition plate 20 is a plate material that partitions the airflow area 14 into the upflow portion 16 and the downflow portion 17, and extends from a part of the side wall 11 to another part. In FIG. 1, the partition plate 20 extends in a direction perpendicular to the paper surface. The upper end portion of the partition plate 20 is separated from the ceiling portion 12 of the absorption tower 10, and the lower end portion is separated from the bottom portion 13. Further, the partition plate 20 has a guide portion 21 corresponding to a reversing portion over the entire upper end portion.

The guide portion 21 has a shape in which the outer peripheral surface is closed in a cross-sectional view. That is, the guide portion 21 has a shape in which the entire outer peripheral surface is a continuous curved surface and has no tip portion. In the present embodiment, the outer peripheral surface of the guide portion 21 has a substantially circular shape in a cross-sectional view. Further, the guide unit 21 is configured to guide the exhaust gas by flowing the exhaust gas from the upflow unit 16 toward the downflow unit 17 along the outer peripheral surface. For example, if the outer diameter of the guide portion 21 is too small, the exhaust gas does not flow along the outer peripheral surface of the guide portion 21, so that the guide portion 21 is configured to have an outer diameter of a certain size or more that can guide the exhaust gas. ing. As an example, the guide portion 21 has an outer diameter of about 500 mm to 1000 mm. The guide portion 21 may be formed of a cylindrical member. In this case, the partition plate 20 can be easily formed, the weight of the partition plate 20 can be reduced, and as a result, the total weight of the absorption tower can be reduced.

The spray nozzle 30 is a member that sprays the absorption liquid 101 in the airflow region 14 of the absorption tower 10. The spray nozzle 30 of the present embodiment sprays the absorption liquid 101 on the upflow section 16, but sprays the absorption liquid 101 on the downflow section 17 in addition to or in place of the upflow section 16. You may. The absorption liquid 101 contains limestone, and the exhaust gas comes into contact with the absorption liquid 101 sprayed from the spray nozzle 30, so that the sulfur oxides contained in the exhaust gas are absorbed by the absorption liquid 101 and desulfurization is performed. The absorption liquid 101 sprayed from the spray nozzle 30 is stored in the storage area 15 of the absorption tower 10.

The spray sub-header 40 is a member that supplies the absorbing liquid 101 to the spray nozzle 30. The spray sub-header 40 has a circular tubular shape and is connected to a spray main header 41 which also has a circular tubular shape. Further, a plurality of spray subheaders 40 are arranged at equal intervals in the horizontal direction in the upflow section 16. In FIG. 1, the spray main header 41 extends in a direction perpendicular to the paper surface, and the spray sub-header 40 is arranged along the spray main header 41 in a direction perpendicular to the paper surface. A plurality of the above-mentioned spray nozzles 30 are provided on the lower surface portion of each spray subheader 40, and the absorption liquid 101 is supplied to these spray nozzles 30. Although the spray subheader 40 of the present embodiment is arranged at the same height position, it may be arranged at a plurality of height positions (that is, so as to form a plurality of stages).

The circulation pump 50 is a pump that pumps the absorption liquid 101 from the storage area 15 of the absorption tower 10 and supplies it to the spray nozzle 30. In the present embodiment, the absorption liquid 101 pumped up by the circulation pump 50 is supplied to each spray nozzle 30 via the spray main header 41 and the spray sub-header 40.

As described above, in the desulfurization apparatus 100 according to the present embodiment, since the guide portion 21 for guiding the exhaust gas is provided at the upper end portion of the partition plate 20, the exhaust gas directed from the upflow portion 16 to the downflow portion 17 As a result of suppressing the turbulence of the flow, the pressure loss of the exhaust gas in the absorption tower 10 can be suppressed.

Further, in the present embodiment, the gypsum scale adheres to the surface of the guide portion 21 provided at the upper end portion of the partition plate 20 for spraying the absorption liquid 101 containing limestone inside the absorption tower 10. However, since the guide portion 21 has a shape in which the outer peripheral surface is closed in a cross-sectional view, the guide portion 21 does not have a tip portion where the gypsum scale is likely to increase. Therefore, according to the desulfurization apparatus 100 according to the present embodiment, the increase of the gypsum scale can be suppressed at the inversion portion.

(Second Embodiment)
Next, the desulfurization apparatus 200 according to the second embodiment will be described. The desulfurization apparatus 200 according to the present embodiment is different from the desulfurization apparatus 100 according to the first embodiment in that the guide portion 21 also functions as a pipe (spray main header 41 of the first embodiment). Hereinafter, the desulfurization apparatus 200 according to the present embodiment will be described focusing on the differences from the desulfurization apparatus 100 according to the first embodiment.

FIG. 2 is a schematic view of the desulfurization apparatus 200 according to the second embodiment. Further, FIG. 3 is a horizontal cross-sectional view of the absorption tower 10 when cut at a position above the guide portion 21. In FIGS. 2 and 3, the same or corresponding elements as those shown in FIG. 1 are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 2, the guide portion 21 of the present embodiment is formed of a circular tube member. Further, as shown in FIG. 3, the guide portion 21 is configured such that the absorbing liquid 101 is supplied to the inside from the circulation pump 50. Further, the absorbent liquid 101 is configured to be supplied from the base end portion (the portion on the upper side of the paper surface in FIG. 3) of the guide portion 21.

Further, the spray sub-header 40 is connected in order from the base end portion of the guide portion 21 to the tip end portion (the lower portion of the paper surface in FIG. 3) side by side in the longitudinal direction. The guide unit 21 is configured to distribute the absorbent liquid 101 supplied from the circulation pump 50 to each spray subheader 40. As described above, since the guide portion 21 of the present embodiment also functions as a pipe (spray main header 41) for supplying the absorbent liquid 101 to the spray nozzle 30, the originally necessary pipe can be omitted, and as a result, the desulfurization apparatus 200 is configured. Can be simplified. Further, since the guide portion 21 is composed of a circular tube member, the partition plate 20 can be easily formed as compared with the case where the partition plate 20 is integrally formed.

Further, as shown in FIG. 3, the guide portion 21 of the present embodiment is formed by connecting three circular tube members 22, 23, and 24 having different inner diameters. These have a larger inner diameter in the order of the circular tube member 22, the circular tube member 23, and the circular tube member 24. That is, in the present embodiment, the three circular tube members 22, 23, and 24 are arranged in order of decreasing inner diameter from the proximal end portion to the distal end portion. Therefore, the inner diameter of the guide portion 21 becomes smaller toward the tip portion.

In the present embodiment, since the absorption liquid 101 is sequentially supplied to the spray subheaders 40 arranged in the longitudinal direction from the base end portion to the tip end portion of the guide portion 21, the absorption liquid 101 supplied to the base end portion of the guide portion 21 is supplied. The flow rate decreases toward the tip. However, in the present embodiment, as described above, the inner diameter of the guide portion 21 decreases toward the tip portion, so that the absorption liquid 101 supplied to the spray subheader 40 even if the flow rate of the absorption liquid 101 at the tip portion decreases. The flow velocity can be maintained.

10 Absorption tower 12 Ceiling part 14 Air flow area 15 Storage area 16 Upflow part 17 Downflow part 20 Partition plate 21 Guide part 22, 23, 24 Circular tube member 30 Spray nozzle 40 Spray subheader 41 Spray main header 50 Circulation pump 100, 200 Desulfurizer 101 Absorbent

Claims (4)

An absorption tower that has an air flow area inside where exhaust gas flows,
A plurality of spray nozzles that spray the absorbent liquid into the airflow area,
Inside the absorption tower, an upflow section where exhaust gas flows upward and a downflow section where exhaust gas flows downward are provided in the absorption tower so as to be separated from the ceiling portion of the absorption tower. Equipped with a partition plate that divides into
The partition plate has a guide portion at the upper end portion and has a guide portion.
The guide portion has a circular shape having an outer diameter of 500 mm or more and 1000 mm or less in a cross-sectional view, and exhaust gas from the upflow portion to the downflow portion flows along the outer peripheral surface of the guide portion. A desulfurization device that is configured to guide the exhaust gas. The desulfurization apparatus according to claim 1, wherein the guide portion is formed of a circular tube member. The absorption tower has a storage area for storing the absorption liquid sprayed from the plurality of spray nozzles.
The desulfurization equipment is
A circulation pump that pumps the absorbent liquid from the storage area and supplies it to the guide unit.
A plurality of spray subheaders that supply an absorbent liquid to the plurality of spray nozzles are provided.
2. The guide portion is configured to distribute the absorption liquid supplied from the circulation pump to the plurality of spray subheaders, and functions as a spray main header for supplying the absorption liquid to the plurality of spray nozzles. Desulfurization equipment according to. The guide portion is configured so that the absorbing liquid is supplied to the base end portion.
The plurality of spray sub-headers are connected in order from the base end portion to the tip end portion of the guide portion in a longitudinal direction.
The desulfurization apparatus according to claim 3, wherein the guide portion is formed by connecting a plurality of circular tube members having different inner diameters in order from the proximal end portion to the distal end portion in order of decreasing inner diameter.

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