JP7109951B2 - Exhaust gas treatment device and method for manufacturing exhaust gas treatment device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an exhaust gas treatment device and a method for manufacturing an exhaust gas treatment device.

For example, since exhaust gas discharged from a coal-fired boiler of a thermal power plant contains harmful sulfurous acid gas, an exhaust gas treatment apparatus is installed for the purpose of removing the sulfurous acid gas (see, for example, Patent Document 1). The sulfurous acid gas is removed by gas-liquid contact with an absorption liquid containing calcium carbonate, and recovered as a gypsum slurry. Since mist is entrained in the flue gas when the sulfurous acid gas and the absorption liquid containing calcium carbonate come into gas-liquid contact, a mist catcher is installed downstream of the absorption tower for the purpose of removing the mist.

Japanese Patent No. 3852820

In recent years, with an increase in the amount of exhaust gas, an increase in differential pressure, that is, a pressure loss in the mist catcher has become a problem. The mist catcher is also equipped with a cleaning device that cleans the corrugated plate members that make up the mist catcher.

SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust gas treatment apparatus and a method for manufacturing an exhaust gas treatment apparatus that enable maintenance of a mist catcher while the plant continues to operate.

According to the first aspect of the present invention, an exhaust gas treatment device is an exhaust gas treatment device for removing sulfur content in exhaust gas discharged from a combustion plant, and reheating the exhaust gas from which the sulfur content has been removed. and a mist catcher arranged on the upstream side of the reheater for removing mist in the exhaust gas, wherein the mist catcher is arranged in a duct through which the exhaust gas flows and communicates with the duct. A plurality of mist removing devices having passages are provided, and the mist removing devices are arranged parallel to each other along the flow direction of the exhaust gas and have ridges bent in a wavy shape so as to bend the mist removing passages. It has a plurality of metal corrugated plate members with uneven shapes, and is configured so that a plurality of members are arranged adjacent to each other over the entire width of the duct, and is detachable from above the duct, and the plurality of mist The uneven shape of the outermost corrugated plate member, which is the outermost corrugated plate member of one of the two mist removing devices adjacent in the width direction of the mist removing device, corresponds to the one mist removing device. By aligning with the uneven shape of the outermost corrugated plate member of the other mist removing device adjacent to the removing device in the width direction, the outermost corrugated plate member of the one mist removing device is aligned with the other mist removing device. It serves as a guide when attaching and detaching the mist removing device from above.

According to such a configuration, even when one of the mist removing devices arranged adjacent to each other is removed for maintenance such as cleaning, the other mist removing devices still function. Thereby, maintenance of the mist catcher can be performed while continuing the operation of the combustion plant.

Further, since the corrugated plate member is made of metal, it is possible to obtain a mist removing device that is superior in durability as compared with the case where the corrugated plate member is made of resin.

In the above exhaust gas treatment apparatus, a manhole that is provided in the upper wall of the duct and extends in the width direction of the duct and is an opening into which the mist removing device is inserted; a pair of intermediate beams arranged upstream and downstream of the inserted mist removing device; and a guide portion having a pair of inclined surfaces formed to be slightly larger than the thickness of the mist removing device.

According to such a configuration, when inserting the mist removing device, the mist removing device can be easily inserted through the manhole because the mist removing device is guided by the inclined surface.

In the above exhaust gas treatment apparatus, a support mechanism is provided on the lower wall of the duct and supports the mist removing device from below. and a pair of second inclined surfaces formed such that the distance between them is slightly greater than the thickness of the mist removing device.

In the above-described exhaust gas treatment apparatus, the support mechanism may have a positioning protrusion that positions the position of the mist removing device in the width direction.

In the above exhaust gas treatment apparatus, among the plurality of corrugated plate members constituting the mist removing device, the outermost corrugated plate member, which is the corrugated plate member provided on the outermost side, is the corrugated plate member provided on the inner side. The plate thickness may be larger than that of the corrugated plate member.

According to such a configuration, the outermost corrugated plate member functions as a strength member, so that the mist removing device can be manufactured without using a member for accommodating the corrugated plate member.

In the above exhaust gas treatment apparatus, the pair of outermost corrugated plate members are formed to protrude above the plurality of inner corrugated plate members, closing the space formed between the pair of outermost corrugated plate members. The ceiling lid includes a ceiling lid main body, a pipe portion passing through the ceiling lid main body, and a ceiling lid main body arranged in the space when the ceiling lid main body is attached, and the inner side and a nozzle portion for injecting washing water supplied through the pipe portion toward the corrugated plate member .

According to such a configuration, the mist removing devices can be cleaned individually by arranging the nozzle portion for spraying the cleaning water in the space of each mist removing device.
In the above exhaust gas treatment apparatus, the pair of outermost corrugated plate members included in the mist removing device are formed to protrude upward from the plurality of inner corrugated plate members, A ceiling lid is attached so as to close a space formed between the external corrugated plate members, and the ceiling lid can independently close each of the plurality of spaces formed in the plurality of mist removing devices. It may be divided as
In the above exhaust gas treatment apparatus, an exhaust gas treatment apparatus for removing sulfur content in exhaust gas discharged from a combustion plant, comprising a reheater for reheating the exhaust gas from which the sulfur content has been removed, and an upstream side of the reheater a mist catcher for removing mist in the exhaust gas, the mist catcher having a plurality of mist removal devices arranged in a duct through which the exhaust gas flows and having a mist removal passage communicating with the duct. The mist removing device is arranged parallel to each other along the flow direction of the exhaust gas, and includes a plurality of uneven metal corrugated plates having ridges bent in a wave shape so as to bend the mist removing passage. A plurality of corrugated plate members that constitute the mist removal device, and are configured to be detachable from above the duct so that a plurality of members are arranged adjacent to each other over the entire width of the duct. Among them, the outermost corrugated plate member, which is the corrugated plate member provided on the outermost side, has a larger plate thickness than the inner corrugated plate member, which is the corrugated plate member provided on the inner side, and is used for the plurality of mist removing devices. Of the two mist removing devices that are adjacent in the width direction, the uneven shape of the outermost corrugated plate member of one mist removing device is the same as that of the other mist removing device that is adjacent to the one mist removing device in the width direction. By being aligned with the uneven shape of the outermost corrugated plate member, the outermost corrugated plate member of the one mist removing device serves as a guide when attaching and detaching the other mist removing device from above.

According to the second aspect of the present invention, in the method for manufacturing an exhaust gas treatment device, when inserting another mist removal device adjacent to one mist removal device already arranged through the manhole, the The peaks of the outermost corrugated plate member of the one mist removing device abut against the peaks of the outermost corrugated plate member of the other mist removing device.

According to such a configuration, the outermost corrugated plate member itself can function as a guide when attaching the mist removing device.

According to the present invention, even when one of the mist removing devices arranged adjacent to each other is removed for maintenance such as cleaning, the other mist removing devices still function. Thereby, maintenance of the mist catcher can be performed while continuing the operation of the combustion plant.

1 is a schematic configuration diagram of a thermal power plant according to an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which simplifies and demonstrates the structure of the mist removal apparatus of embodiment of this invention. FIG. 3 is a side view of multiple mist eliminators attached to a duct; Fig. 2 is a front view of multiple mist removing devices attached to a duct; It is a perspective view explaining the structure which accommodates the mist removal apparatus in a duct. 1 is a perspective view of a mist removing device according to an embodiment of the present invention; FIG. It is a top view of the mist removing device of the embodiment of the present invention. It is a detailed view of the fastening mechanism of the mist removing device of the embodiment of the present invention. It is a figure explaining division|segmentation of the corrugated-plate member in the mist removal apparatus of embodiment of this invention. FIG. 4 is a cross-sectional view of the intermediate guide mechanism and support mechanism of the embodiment of the present invention; 1 is a perspective view of a support mechanism according to an embodiment of the invention; FIG. FIG. 4 is a cross-sectional view of the intermediate guide mechanism and support mechanism of the embodiment of the present invention; It is the schematic explaining a mode that the mist removal apparatus of embodiment of this invention attaches and detaches. It is a schematic diagram explaining the arrangement relationship of the mist removal device which constitutes the mist catcher of the embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The exhaust gas treatment apparatus of this embodiment includes a mist catcher having a plurality of mist removing devices. An exhaust gas treatment device is a device used to treat exhaust gas discharged from a coal-fired boiler of a thermal power plant.
As shown in FIG. 1 , the thermal power plant 50 has a boiler 52 (combustion plant) that burns fuel, and an exhaust gas treatment device 51 that treats the exhaust gas EG discharged from the boiler 52 .

The exhaust gas treatment device 51 removes nitrogen oxides (NOx), dust, and sulfur oxides (SOx) contained in the exhaust gas EG discharged from the boiler 52 while the exhaust gas EG is discharged from the chimney 58 .
The exhaust gas treatment device 51 includes, in order from the upstream side of the exhaust gas EG, an electrostatic precipitator 53, a heat recovery device 54, a cooling tower 55, a first mist catcher 1A(1), an absorption tower 56, and a second mist catcher 1B. (1), a reheater 57, and a chimney 58.

The electric dust collector 53 is a device that removes dust contained in the exhaust gas EG.
The heat recovered by the heat recovery device 54 is used in the reheater 57 to raise the temperature of the exhaust gas EG. The cooling tower 55 is equipment for cooling the high-temperature exhaust gas EG. The first mist catcher 1</b>A removes mist contained in the exhaust gas EG discharged from the cooling tower 55 . The absorption tower 56 is equipment for removing chemical substances contained in the exhaust gas EG using an absorbent. The second mist catcher 1B removes mist contained in the exhaust gas EG discharged from the absorption tower 56. The exhaust gas EG reheated by the reheater 57 is released to the atmosphere from the chimney 58 .
The mist catcher 1 of this embodiment is composed of a plurality of mist removing devices 2 (see FIG. 6).
In addition, the configuration of the exhaust gas treatment device 51 is not limited to the configuration described above.

FIG. 2 is a schematic explanatory diagram for simplifying and explaining the configuration of the mist catcher 1 (mist removing device 2).
As shown in FIG. 2, the mist catcher 1 is arranged in a duct 60 (flow path) through which the exhaust gas EG flows. The mist catcher 1 has a plurality of corrugated plate members 3 arranged parallel to each other along the flow direction F of the exhaust gas EG. Between the corrugated plate members 3 adjacent to each other in the width direction W of the duct 60, a bent mist removing passage 4 is formed in communication with the duct 60. As shown in FIG. That is, the corrugated plate member 3 is bent in a wave shape so as to bend the mist removing passage 4 .

The mist M (fine particles, dust) contained in the exhaust gas EG is removed by colliding with the corrugated plate member 3 and adhering to the corrugated plate member 3 when passing through the mist removal passage 4 .
The mist catcher 1 of this embodiment is configured in two stages, and the shape of the corrugated plate member 3U of the mist catcher 1U on the upstream side is different from the shape of the corrugated plate member 3D of the mist catcher 1D on the downstream side. Specifically, the corrugated plate member 3U of the mist catcher 1U on the upstream side has one peak 5, and the corrugated plate member 3D of the mist catcher 1D on the downstream side has two peaks 5. ing.
According to the above configuration, the upstream mist catcher 1U can roughly remove mist, and the downstream mist catcher 1D can remove the mist that has not been completely removed by the upstream mist catcher 1U. Moreover, the pressure loss in the mist catcher 1U on the upstream side can be reduced.

Next, details of the mist catcher 1 of the present embodiment will be described with reference to FIGS. 3, 4, and 5. FIG.
3 is a side view of the mist catcher 1 attached to the duct 60, FIG. 4 is a front view of the mist catcher 1 (a plurality of mist removing devices 2) attached to the duct 60, and FIG. 4 is a perspective view illustrating a structure for accommodating the mist catcher 1 in the duct 60; FIG.

As shown in FIGS. 3, 4, and 5, the mist catcher 1 has a plurality of mist removing devices 2. FIG. A plurality of mist removing devices 2 are arranged adjacent to each other in the width direction W over the entire width of the duct 60 and are configured to be attachable and detachable from above the duct 60 .
The mist catcher 1 is composed of eight mist removing devices 2, for example. The number of mist removing devices 2 can be appropriately changed according to the cost and the width of the duct 60 .

As shown in FIG. 5, the duct 60 has an upper wall 61, a pair of side walls 62 and a lower wall 63. As shown in FIG. An upper wall 61 of the duct 60 is formed with a manhole 64 that is an opening for inserting the mist removing device 2 from above. The manhole 64 extends in the width direction W of the duct 60 . The manhole 64 has a square tubular portion 65 protruding upward from the upper wall 61 and a flange portion 66 protruding outward from the upper end of the square tubular portion 65 . The flange portion 66 is covered by the ceiling lid 20 (see FIG. 6) during operation of the thermal power plant 50 .

A lower wall 63 of the duct 60 is provided with a support mechanism 68 that supports the mist removing device 2 from below.
The duct 60 is provided with an intermediate guide mechanism 78 that extends in the width direction W between the pair of side walls 62 and guides the mist removing device 2 when the mist removing device 2 is attached or detached.

A hoist 90 is installed above the upper wall 61 of the duct 60 . The hoist 90 is installed on a hoist support frame 91 so as to be movable in the width direction W of the duct 60 . The hoist 90 includes a hanging chain 92 and hooks 93 and can support the mist removing device 2 through the manhole 64 so as to be vertically movable.

A hopper 94 is provided below the duct 60 for collecting the waste water discharged when the mist catcher 1 is washed.
The height of the duct 60 of this embodiment is about 8 m, and the vertical length of the mist removing device 2 is correspondingly about 8 m.

Next, details of the mist removing device 2 that constitutes the mist catcher 1 will be described. In the following description, a mist removing device 2D that has two peaks 5 and constitutes a downstream mist catcher 1D arranged downstream in the flow direction F of the exhaust gas EG will be described.
As shown in FIGS. 6, 7 and 8, the mist removing device 2D has a unit 7 having a plurality of corrugated plate members 3D and a pair of side plate members 6, and a ceiling lid 20. As shown in FIGS. The corrugated plate member 3D and the side plate member 6 are made of metal. As the metal forming the corrugated plate member 3D and the side plate member 6, for example, a stainless steel material such as SUS316 is preferable. A plurality of corrugated plate members 3D are unitized using a fastening mechanism 15 .
The ceiling cover 20 is attached to the manhole 64 (see FIG. 3) to seal the manhole 64 .
The unit 7 has a plurality of hook holes 14 used for hanging the mist removing device 2 . A hook 93 of a hoist 90 can be hooked on the hook hole 14 .

The cross-sectional shape of the corrugated plate member 3D having two crests 5 is an uneven shape (zigzag shape) having a plurality of crests and valleys alternately. The corrugated plate member 3D includes a first slope portion 9 that inclines in one width direction W toward the downstream side in the flow direction F of the exhaust gas EG, and a first slope portion 9 that inclines in the other width direction W toward the downstream side in the flow direction F. a first flat portion 11 connected to the upstream side of the mountain portion 5 and formed along the flow direction F of the exhaust gas EG; and a downstream side of the mountain portion 5. and a second flat portion 12 formed along the flow direction F of the exhaust gas EG. A through hole 13 through which a bolt 16 of a fastening mechanism 15 is inserted is formed in the first plane portion 11 and the second plane portion 12 .
The plurality of corrugated plate members 3D are arranged so that the crest portions 5 are aligned in the flow direction F with each other. The mist removal passage 4 formed between the corrugated plate members 3D has a shape that repeatedly bends along the flow direction F. As shown in FIG.

Among the plurality of corrugated plate members 3D, the thickness of the pair of outermost corrugated plate members 3DA, which are the corrugated plate members 3D provided on the outermost side, is the inner corrugated plate member 3DB, which is the corrugated plate member 3D provided inside. greater than the plate thickness of The plate thickness of the outermost corrugated plate member 3DA of this embodiment is 3 mm, and the plate thickness of the inner corrugated plate member 3DB is 1 mm. The thickness of the inner corrugated plate member 3DB may be appropriately changed according to the strength required for the mist removing device 2. For example, the plate thickness of part of the inner corrugated plate member 3DB may be set to 1.5 mm.

The fastening mechanism 15 includes bolts 16 (connecting members) passing through the through-holes 13 formed in the corrugated plate member 3, and a plurality of tubular members disposed between the corrugated plate members 3 and having the bolts 16 inserted through the inner peripheral side thereof. spacer tube 17 and nut 18 .
The bolt 16 is a rod-shaped member having a male screw groove formed on its outer peripheral surface. Both ends of the bolt 16 are fixed by welding to the outermost corrugated plate member 3DA so as not to protrude from the outermost corrugated plate member 3DA.
The inner diameter of the spacer tube 17 is larger than the outer diameter of the bolt 16 and the outer diameter of the spacer tube 17 is larger than the through hole 13 . The spacer tube 17 is formed so that the length of the spacer tube 17 corresponds to the interval between the adjacent corrugated plate members 3D.
As shown in FIG. 9, a plurality of fastening mechanisms 15 are provided at intervals in the vertical direction.

The vertical length of the pair of outermost corrugated plate members 3DA is longer than the vertical length of the plurality of inner corrugated plate members 3DB. The pair of outermost corrugated plate members 3DA protrudes upward from the plurality of inner corrugated plate members 3DB.

Here, the outer shape of the unit 7 of the mist removing device 2 will be described. The vertical length L of the unit 7 of the mist removing device 2 is 8 m (8,000 mm) or more. The width Wi of the unit 7 of the mist removing device 2 is 900 mm or less, and the thickness T of the unit 7 of the mist removing device 2 is 400 mm or less.
Focusing on the length L of the unit 7 and the thickness T of the unit 7, L/T≧20. That is, the unit 7 has a shape elongated in the vertical direction.

Since the ratio of the length L of the unit 7 to the thickness T of the unit 7 is L/T≧20, when the unit 7 is attached through the manhole 64, the unit 7 is tilted only slightly. Installation becomes difficult. That is, it becomes difficult to engage the lower end of the unit 7 with the support mechanism 68 .

The ceiling lid 20 is attached so as to cooperate with the manhole 64 to close the space S formed between the pair of outermost corrugated plate members 3DA.
The ceiling lid 20 has a ceiling lid body 21 and a spray pipe 22. - 特許庁The spray pipe 22 has a pipe portion 23 connected to a cleaning water supply source (not shown) and a nozzle portion 24 connected to the lower end of the pipe portion 23 . The pipe portion 23 is attached so as to pass through the ceiling lid main body 21 . The nozzle part 24 is arranged in the space S formed between the pair of outermost corrugated plate members 3DA and ejects washing water downward when the ceiling lid 20 is attached. As a result, washing water is jetted toward the inner corrugated plate member 3DB.

As shown in FIG. 9, the inner corrugated plate member 3DB is divided in the vertical direction V, that is, in the attachment/detachment direction. The inner corrugated plate member 3DB is divided by two corrugated plate member pieces 8 .
The positions of the division points D of the one corrugated plate member piece 8 and the other corrugated plate member piece 8 constituting the inner corrugated plate member 3DB are arranged in the vertical direction V (detachment direction) between the two adjacent inner corrugated plate members 3DB. are displaced. The mist removing device 2 of the present embodiment is configured such that one divided portion D and another divided portion D whose position in the vertical direction V is different from that of the one divided portion D are alternately arranged in the width direction W. It is
A predetermined gap is formed between the corrugated plate member pieces 8 adjacent to each other in the vertical direction V to such an extent that the performance of the mist removing device 2 is not degraded.

As shown in FIG. 10 , the intermediate guide mechanism 78 has a pair of existing intermediate beams 79 provided on the duct 60 and an intermediate guide member 80 attached to the intermediate beams 79 .
The existing intermediate beams 79 are arranged below the manhole 64 and on the upstream and downstream sides of the mist removing device 2 inserted from the manhole 64 in the flow direction F of the exhaust gas EG. The existing intermediate beam 79 is made of steel with a rectangular cross section and extends to connect one side wall 62 and the other side wall 62 of the duct 60 . The thickness of the mist removing device 2D for the mist catcher 1D on the downstream side is slightly smaller than the interval between the pair of intermediate beams 79 .

The intermediate guide member 80 has a pair of clamp portions 81 for attaching the intermediate guide member 80 to the intermediate beam 79 and guide portions 84 fixed to each clamp portion 81 . Each clamp part 81 is in contact with a first clamp 82 formed to contact three of the four surfaces of the intermediate beam 79 having a rectangular cross section, and the remaining one surface of the four surfaces of the intermediate beam 79 having a rectangular cross section. and a second clamp 83 formed to. The clamp part 81 is fixed to the intermediate beam 79 by fastening the first clamp 82 and the second clamp 83 .

The pair of guide portions 84 are members that guide the mist removing device 2 inserted from above between the pair of intermediate beams 79 . The pair of guide portions 84 are inclined surfaces that are inclined so that the distance between them decreases as they go downward. The pair of guide portions 84 are arranged such that the distance between the lower ends of the pair of guide portions 84 is slightly larger than the thickness of the mist removing device 2 (the thickness in the flow direction F of the exhaust gas EG).

10 and 11, the support mechanism 68 includes a lower beam 69 which is an existing beam provided on the duct 60, an attachment 70 attached to the lower beam 69, and a support fixed to the attachment 70. and a guide member 73 . Further, the support mechanism 68 has a positioning projection 76 for positioning the width direction W of the mist removing device 2 . The thickness of the mist removing device 2D for the mist catcher 1D on the downstream side is slightly larger than the interval between the pair of lower beams 69 .

The attachment 70 has a pair of L-shaped members 71 formed so as to partially cover the surface of the lower beam 69, and a connecting portion 72 that connects the pair of L-shaped members 71 to each other.
The pair of support guide members 73 are members that guide the mist removing device 2 inserted from above onto the pair of lower beams 69 . The pair of support guide members 73 are connected to a sloped surface 74 (second sloped surface) that slopes downward so that the distance between them decreases, and the lower end of the sloped surface 74. and a vertical plane 75 along. The pair of inclined surfaces 74 are arranged such that the distance between the lower ends of the pair of inclined surfaces 74 is slightly larger than the thickness of the mist removing device 2 (the thickness in the flow direction F of the exhaust gas EG). The distance between the pair of vertical surfaces 75 is slightly larger than the thickness of the mist removing device 2 .

Next, the configurations of the intermediate guide mechanism 78U and the support mechanism 68U used in the upstream mist removing device 2U having one upstream mountain portion 5 will be described.
As shown in FIG. 12, the thickness of the mist removing device 2U for the mist catcher 1U on the upstream side is smaller than the interval between the pair of intermediate beams 79 . Therefore, corresponding to the mist removing device 2U for the mist catcher 1U on the upstream side, the intermediate guide member 80U of the intermediate guide mechanism 78U on the upstream side protrudes from the intermediate beam 79 more than the intermediate guide member 80 on the downstream side. big.
Similarly, corresponding to the mist removing device 2U for the mist catcher 1U on the upstream side, the support guide member 73U of the support mechanism 68U on the upstream side protrudes from the lower beam 69 more than the support guide member 73 on the downstream side. big.

As shown in FIG. 13 , the mist removing device 2 can be attached and detached by lifting and lowering the mist removing device 2 using a hoist 90 . At this time, since the unit 7 of the mist removing device 2 is guided by the guide portion 84 of the intermediate guide mechanism 78, the vibration of the unit 7 in the flow direction F of the exhaust gas EG is absorbed.
Further, as shown in FIG. 4, the mist catcher 1 has a plurality of mist removing devices 2. By removing one mist removing device 2 among the plurality of mist removing devices 2, the mist catcher 1 can be Maintenance of the mist removing device 2 can be performed without greatly affecting the performance of the device.

Further, as shown in FIG. 14, when the mist removing device 2 is inserted from the manhole 64 using the hoist 90, the outermost corrugated plate members 3DA of the mist removing device 2 adjacent to each other in the width direction W of the duct 60 Since they are arranged adjacently, the outermost corrugated sheet member 3DA itself can function as a guide. At this time, the crests 5 of the outermost corrugated plate member 3DA of one mist removing device 2 abut against the crests 5 of the outermost corrugating plate member 3DA of the other mist removing device 2 .
That is, as a method of manufacturing an exhaust gas treatment apparatus, the unit 7 is placed on the other side W2 of the unit 7 in the width direction W using the outermost corrugated plate member 3DA of the unit 7 arranged on the one side W1 in the width direction W as a guide. An inserting step can be performed.

Also, when attaching and detaching the mist removing device 2, the guide 86 shown in FIGS. 3 and 13 can be used. By providing the guide 86, contact between the mist removing device 2 and the manhole 64 can be prevented when the mist removing device 2 is attached, and the mounting of the mist removing device 2 can be performed smoothly. Furthermore, when the mist removing device 2 is removed, the scale adhering to the mist removing device 2 can be scraped off during operation, and the outside of the device can be prevented from being soiled. Further, as in the case of mounting, when the mist removing device 2 is removed, contact between the mist removing device 2 and the manhole 64 can be prevented.

According to the above embodiment, even when one of the mist removing devices 2 arranged adjacently is removed and maintenance such as cleaning is performed, the other mist removing devices 2 still function. do. Thereby, maintenance of the mist removing device 2 can be performed while continuing the operation of the plant.
Further, since the corrugated plate member 3 is made of metal, the mist removing device 2 can be made to have excellent durability as compared with the case where the corrugated plate member 3 is made of resin.

Further, since the duct 60 is provided with the intermediate guide mechanism 78 having the guide portion 84, the insertion of the unit 7 through the manhole 64 can be facilitated.

Further, since the outermost corrugated plate member 3DA functions as a strength member, the mist removing device 2 can be manufactured without using a member for accommodating the corrugated plate member 3. FIG. Further, since the outermost corrugated plate members 3DA of the mist removing devices 2 adjacent to each other in the width direction W of the duct 60 are arranged adjacent to each other, the outermost corrugated plate members 3DA themselves are guided when the mist removing device 2 is attached. can function as

Moreover, the fastening mechanism 15 for fastening the corrugated plate members 3 together is provided, and the spacing between the corrugated plate members 3 can be maintained at a desired interval by interposing the spacer pipes 17 between the corrugated plate members 3 .

Adjacent corrugated plate members 3 are each divided by two corrugated plate member pieces 8 arranged along the vertical direction, and one corrugated plate member piece 8 and the other corrugated plate member 3 constitute the corrugated plate member 3. The positions of the division points of the member pieces 8 are shifted in the vertical direction between two adjacent corrugated plate members 3 . Thereby, the corrugated plate member 3 can be formed more easily than when the corrugated plate member 3 is integrally formed.
Moreover, the mist removing device 2 can be washed individually by arranging the nozzle portion 24 for spraying the cleaning water in the space S of each mist removing device 2 .

As described above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes etc. within the scope of the present invention are also included. .

REFERENCE SIGNS LIST 1 mist catcher 2 mist removal device 3 corrugated plate member 3DA outermost corrugated plate member 3DB inner corrugated plate member 4 mist removal passage 5 mountain portion 6 side plate member 7 unit 8 corrugated plate member piece 9 first slope portion 10 second slope portion 11 First plane part 12 Second plane part 13 Through hole 14 Hook hole 15 Fastening mechanism 16 Bolt 17 Spacer pipe 18 Nut 20 Ceiling lid 21 Ceiling lid main body 22 Spray pipe 23 Pipe part 24 Nozzle part 50 Thermal power plant 51 Exhaust gas treatment device 52 Boiler (combustion plant)
53 Electric dust collector 54 Heat recovery device 55 Cooling tower 56 Absorption tower 57 Reheater 58 Chimney 60 Duct 61 Upper wall 62 Side wall 63 Lower wall 64 Manhole 65 Rectangular tube 66 Flange 68 Support mechanism 69 Lower beam 70 Attachment 71 L-shaped member 72 connecting portion 73 support guide member 74 inclined surface (second inclined surface)
75 Vertical surface 76 Positioning protrusion 78 Intermediate guide mechanism 79 Intermediate beam 80 Intermediate guide member 81 Clamp part 82 First clamp 83 Second clamp 84 Guide part 90 Hoist 91 Hoist support frame 92 Suspension chain 93 Hook 94 Hopper EG Exhaust gas F Flow Direction S Space W Width direction

Claims (9)

An exhaust gas treatment device for removing sulfur content in exhaust gas discharged from a combustion plant,
a reheater for reheating the exhaust gas from which the sulfur content has been removed;
A mist catcher arranged upstream of the reheater and removing mist in the exhaust gas,
The mist catcher is
Having a plurality of mist removal devices arranged in the duct through which the exhaust gas flows and having a mist removal passage communicating with the duct,
The mist removing device is
a plurality of uneven metal corrugated plate members arranged parallel to each other along the flow direction of the exhaust gas and having ridges bent in a wave shape so as to bend the mist removal passage;
A plurality of the ducts are arranged adjacent to each other over the entire width of the duct, and are detachable from above the duct,
The uneven shape of the outermost corrugated plate member, which is the outermost corrugated plate member of one mist removing device among the two mist removing devices adjacent in the width direction of the plurality of mist removing devices, By aligning with the uneven shape of the outermost corrugated plate member of another mist removing device adjacent to the one mist removing device in the width direction, the outermost corrugated plate member of the one mist removing device , an exhaust gas treatment device that serves as a guide when attaching and detaching the other mist removal device from above. a manhole which is an opening provided in the upper wall of the duct, extending in the width direction of the duct, and into which the mist removing device is inserted;
a pair of intermediate beams arranged below the manhole and upstream and downstream of the mist removing device inserted from the manhole;
A guide having a pair of inclined surfaces which are attached to the intermediate beam, are inclined so as to approach each other downward, and are formed such that the distance between the lower ends is slightly larger than the thickness of the mist removing device. The exhaust gas treatment apparatus according to claim 1 , comprising a part. a support mechanism provided on the lower wall of the duct and supporting the mist removing device from below;
3. The support mechanism has a pair of second inclined surfaces which are inclined so as to come closer to each other as they go downward, and which are formed such that the distance between the lower ends is slightly larger than the thickness of the mist removing device. 2. The exhaust gas treatment device according to 2. 4. The exhaust gas treatment apparatus according to claim 3 , wherein the support mechanism has positioning projections for positioning the position of the mist removing device in the width direction. Among the plurality of corrugated plate members constituting the mist removing device, the outermost corrugated plate member, which is the corrugated plate member provided on the outermost side, is higher than the inner corrugated plate member, which is the corrugated plate member provided on the inner side. The exhaust gas treatment device according to any one of claims 2 to 4 , wherein the plate thickness is large. The pair of outermost corrugated plate members are formed to protrude upward from the plurality of inner corrugated plate members,
Having a ceiling lid attached so as to close the space formed between the pair of outermost corrugated plate members,
The ceiling lid includes a ceiling lid body, a pipe portion passing through the ceiling lid body, and a pipe portion disposed in the space when the ceiling lid body is attached and extending the pipe portion toward the inner corrugated plate member. 6. The exhaust gas treatment apparatus according to claim 5 , further comprising a nozzle portion for injecting cleaning water supplied through the nozzle portion. The pair of outermost corrugated plate members included in the mist removing device are formed to protrude upward from the plurality of inner corrugated plate members,
having a ceiling lid attached to close a space formed between the pair of outermost corrugated plate members of each mist removing device;
6. The exhaust gas treatment apparatus according to claim 5 , wherein said ceiling lid is divided so as to be able to independently close each of said plurality of spaces formed in said plurality of mist removing devices. An exhaust gas treatment device for removing sulfur content in exhaust gas discharged from a combustion plant,
a reheater for reheating the exhaust gas from which the sulfur content has been removed;
A mist catcher arranged upstream of the reheater and removing mist in the exhaust gas,
The mist catcher is
Having a plurality of mist removal devices arranged in the duct through which the exhaust gas flows and having a mist removal passage communicating with the duct,
The mist removing device is
a plurality of uneven metal corrugated plate members arranged parallel to each other along the flow direction of the exhaust gas and having ridges bent in a wave shape so as to bend the mist removal passage;
A plurality of the ducts are arranged adjacent to each other over the entire width of the duct, and are detachable from above the duct,
Among the plurality of corrugated plate members constituting the mist removing device, the outermost corrugated plate member, which is the corrugated plate member provided on the outermost side, is the inner corrugated plate member, which is the corrugated plate member provided on the inner side. plate thickness is larger than
The uneven shape of the outermost corrugated plate member of one of the two mist removing devices adjacent in the width direction of the plurality of mist removing devices is adjacent to the one mist removing device in the width direction. Since the outermost corrugated plate member of the other mist removing device is aligned with the uneven shape, the outermost corrugated plate member of the one mist removing device allows the other mist removing device to be attached and detached from above. Exhaust gas treatment equipment that serves as a guide in every situation. A method for manufacturing an exhaust gas treatment apparatus according to claim 5 or 6 ,
When inserting another mist removing device adjacent to one already arranged mist removing device through the manhole,
A method for manufacturing an exhaust gas treatment device, wherein the peaks of the outermost corrugated plate member of the one mist removing device are abutted against the peaks of the outermost corrugated plate member of the other mist removing device.

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