WO2022044296A1

WO2022044296A1 - Spray tube support structure of flue gas desulfurisation device

Info

Publication number: WO2022044296A1
Application number: PCT/JP2020/032771
Authority: WO
Inventors: 晶寛上神; 一大倉
Original assignee: 三菱重工業株式会社
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2022-03-03

Abstract

A spray tube 6A, which delivers an absorbent liquid to a spray nozzle, extends substantially horizontally in an absorption column 1. The absorbent liquid is supplied from the spray nozzle into a flue gas flowing through a gas flow passage 3 in the absorption column 1, and the absorbent liquid absorbs sulfur oxide in the flue gas. A support tube 17 has a tubular shape, in which the absorbent liquid does not flow, and extends substantially in parallel with the spray tube 6A in the absorption column 1. A plurality of reinforcement members 14 connect the spray tube 6A and the support tube 17 to form a truss structure 15A.

Description

Spray pipe support structure for flue gas desulfurization equipment

The present invention relates to a spray pipe support structure of a flue gas desulfurization apparatus.

A flue gas desulfurization device (wet limestone-plaster flue gas desulfurization device) has been widely put into practical use as a device for removing sulfur oxides from exhaust gas containing sulfur oxides generated in a thermal power plant or the like. In the flue gas desulfurization apparatus, the generated exhaust gas is guided to an absorption tower (desulfurization absorption tower) and brought into contact with the absorbing liquid to absorb and remove sulfur oxides.

In Patent Document 1, a first spray device having a plurality of spray tubes extending horizontally from an outer header of the absorption tower body toward the inside of the absorption tower body is provided, and a first spray device is provided below the first spray device. Described is a flue gas desulfurization device in which a second spray device is provided so as to position another spray tube directly under each spray tube of the spray device, and a plurality of spray nozzles for spraying an absorbent liquid are arranged in each spray tube. Has been done. Brace sloped uphill and brace inclined downhill are alternately arranged between the spray pipes arranged so as to overlap each other, and the spray pipe is connected by each brace. The truss structure is formed by the spray pipe and the brace, and the spray pipes are mutually reinforced. Further, a third spray device configured so that another spray tube is arranged directly under each spray tube of the second spray device is arranged, and the spray tube of the second spray device and the spray tube of the third spray device are arranged. It is stated that braces may be provided between the two to form a truss structure.

Japanese Unexamined Patent Publication No. 7-241436

In order to apply the truss structure of Patent Document 1, another spray tube (counterpart spray tube) extending substantially parallel to one spray tube is required, and a spray tube without a mating spray tube (single spray). It cannot be applied to pipes). Therefore, when reinforcing the single spray pipe, for example, a reinforcing structure such as installing a spray pipe support beam extending in a direction orthogonal to the single spray pipe and supporting the single spray pipe from below is required in the absorption tower. .. When the spray pipe support beam is installed, the internal structure of the absorption tower becomes complicated, which leads to an increase in the flow resistance (pressure loss) of the exhaust gas.

Also, if the three or more stages of spray pipes that overlap vertically are connected by a truss structure, the load load on the bottom spray pipe will increase. For this reason, the number of stages of the spray pipes connected by the truss structure is limited to two stages (upper and lower one pair), and if the total number of stages is large, the upper and lower spray pipes are divided into groups of two stages, and the upper and lower spray pipes are connected in the truss structure. It is preferable to connect with. For example, when the total number of stages is 4, the 1st and 2nd stages are set as the 1st set, the 3rd and 4th stages are set as the 2nd set, and between the 1st and 2nd stages and the 3rd stage. The eyes and the 4th stage are connected by a truss structure, respectively, and the 2nd and 3rd stages are not connected by a truss structure. However, since it is divided into pairs for every two stages, when the total number of stages is odd, one stage that cannot be combined remains, and the same inconvenience as the above-mentioned single spray tube occurs.

Therefore, it is an object of the present invention to reinforce the spray pipe with a simplified structure without requiring another spray pipe to be combined.

In order to achieve the above object, the first aspect of the present invention is a spray pipe support structure of a flue gas desulfurization apparatus, which includes a support pipe and a plurality of reinforcing members. In the flue gas desulfurization device, the spray pipe that sends the absorbed liquid to the spray nozzle extends substantially horizontally in the absorption tower, and the absorbed liquid is supplied from the spray nozzle into the exhaust gas flowing through the gas flow passage in the absorption tower to be contained in the exhaust gas. Absorb sulfur oxides with an absorbent solution.

The support tube has a tube shape in which the absorbent liquid does not flow inside, and extends substantially parallel to the spray tube in the absorption tower. The plurality of reinforcing members connect the spray pipe and the support pipe to form a truss structure.

In the above configuration, the support pipe is arranged in the absorption tower so as to extend substantially parallel to the spray pipe, and the spray pipe and the support pipe are connected by a plurality of reinforcing members to form a truss structure, which is a partner of the combination. The truss structure can reinforce the spray tube without the need for another spray tube.

It is not necessary to install a spray pipe support beam that extends in the direction orthogonal to the spray pipe and supports the spray pipe from below in the absorption tower, and the support pipe that extends substantially parallel to the spray pipe enables rectification of exhaust gas. It is possible to suppress an increase in the flow resistance (pressure loss) of the exhaust gas.

Further, since the support tube has a tube shape in which the absorbing liquid does not flow inside, it is possible to secure the desired strength while suppressing the weight increase of the support tube.

The second aspect of the present invention is the spray tube support structure of the first aspect, and the spray tube has a circular tube shape in which the inner diameter is reduced from the upstream side to the downstream side in the flow direction of the absorbing liquid. .. The support tube has a uniform circular tube shape with an inner diameter that does not expand or contract from one end to the other.

In the above configuration, the inner diameter of the spray pipe through which the absorbent liquid flows is reduced from the upstream side to the downstream side, so that the absorbent liquid can be reliably supplied to the downstream end. On the other hand, for the support tube in which the absorbent liquid does not flow inside, it is possible to use a versatile tube material that has a uniform inner and outer diameters from one end to the other end and the cross-sectional shape does not change in the longitudinal direction, instead of a special shape. can.

The third aspect of the present invention is the spray pipe support structure of the first or second aspect, and one end or both ends of the support pipe are open ends opened by a gas flow passage. A closing member that closes the open end is fixed to the support pipe.

In the above configuration, since the open end of the support pipe is closed by the closing member, the inside of the support pipe can be shielded from the gas flow passage to prevent the inflow of exhaust gas. Therefore, even when the support pipe is formed of a material (for example, steel material) that is easily corroded by the exhaust gas containing the absorbing liquid, the inner peripheral surface of the support pipe is not subjected to corrosion resistance treatment (for example, coating). Corrosion of the inner peripheral surface of the support tube can be prevented.

In addition, it is possible to suppress an increase in the flow resistance (pressure loss) of the exhaust gas due to the exhaust gas flowing into the support pipe.

According to the present invention, the spray pipe can be reinforced by a simplified structure without the need for another spray pipe to be combined.

It is a figure which shows typically the structure of the flue gas desulfurization apparatus which concerns on 1st Embodiment of this invention. It is a side view which looked at the spray pipe of FIG. 1 from the right side. It is a side view which looked at the spray pipe of FIG. 1 from the rear side. FIG. 3 is a top view showing the spray pipe of FIG. 1 in a cross section taken along the line IV-IV of FIG. It is an enlarged view of the front end side of the spray tube in the upper part of FIG. FIG. 5 is a rear view of the pipe support member of FIG. 5 as viewed from the rear side. It is a side view which shows the brace connection structure of 2nd Embodiment. FIG. 7 is a cross-sectional view taken along the line VIII-VIII of FIG. It is sectional drawing of the pipe support member of 3rd Embodiment. It is a side view which looked at the spray pipe of 4th Embodiment from the right side.

The flue gas desulfurization apparatus according to the present invention will be described with reference to the drawings. In the following description, the front means the inflow side of the exhaust gas in the absorption tower 1, and the left and right means the left and right when the rear is viewed from the front. Further, in FIGS. 2 and 3, the spray nozzle 5 is not shown, and in FIG. 4, the upper brace 14 is not shown.

(First Embodiment)
The flue gas desulfurization apparatus according to the first embodiment of the present invention is a wet limestone-gypsum method flue gas desulfurization apparatus that removes sulfur oxides from exhaust gas containing sulfur oxides generated in a thermal power plant or the like. It is provided with an absorption tower (desulfurization absorption tower) 1 into which the contained exhaust gas is introduced, and a separation device (not shown) for separating the absorption liquid flowing out from the absorption tower 1 into plaster and a dehydration filtrate.

As shown in FIGS. 1 to 4, the absorption tower 1 has a cylindrical peripheral wall 2 that stands up substantially vertically, and the inner peripheral surface of the peripheral wall 2 partitions a gas flow passage 3 extending in the vertical direction. An inlet duct 4 is connected to the front side of the peripheral wall 2, and the exhaust gas from the boiler (not shown) is introduced into the gas flow passage 3 via the inlet duct 4. The introduced exhaust gas flows through the gas flow passage 3 from the lower side to the upper side.

A large number of spray nozzles 5 are installed in the upper part of the gas flow passage 3 in the absorption tower 1, and the absorption liquid is sprayed from the spray nozzles 5 as fine droplets. When the sprayed absorption liquid comes into contact with the exhaust gas (gas-liquid contact), the sulfur oxides in the exhaust gas are chemically removed on the surface of the absorption droplets and discharged from the exhaust gas outlet 7 at the upper and rear sides. As described above, the spray nozzle 5 is a spray type in which the absorption liquid is sprayed as fine droplets and the sprayed droplets are brought into contact with the exhaust gas flowing upward, and the absorption liquid supplied from the spray nozzle 5 oxidizes sulfur in the exhaust gas. The thing is absorbed and removed. The minute droplets accompanying the exhaust gas flow are removed by a mist eliminator (not shown) installed on the exhaust gas outlet 7 side of the absorption tower 1. The gas from which minute droplets have been removed by the mist eliminator is heated by a reheating facility (not shown) installed on the wake side of the absorption tower 1 as needed, and discharged from the chimney (not shown). To. Most of the droplets sprayed from the spray nozzle 5 absorb the sulfur oxides and then fall into the absorption tower tank 8 provided at the lower part of the absorption tower 1. The absorbed liquid staying in the absorption tower tank 8 is sent by the absorption liquid circulation pump 9 and supplied from the absorption liquid circulation pipe 10 to the spray nozzle 5. Further, the absorption tower tank 8 is provided with an air supply device (not shown) that supplies air to the accumulated absorption liquid.

As shown in FIG. 1, the plurality of spray nozzles 5 include a plurality of spray nozzles 5A in the upper stage, a plurality of spray nozzles 5B in the middle stage, and a plurality of spray nozzles 5C in the lower stage. The number and arrangement of the spray nozzles 5 in each stage can be arbitrarily set. It is preferable that the plurality of spray nozzles 5 are arranged so that the absorbing liquid is evenly sprayed on the exhaust gas flowing through the gas flow passage 3. Note that FIG. 1 omits the illustration of the pipes for supplying the absorbed liquid to the

spray nozzles

5B and 5C in the middle and lower stages of the absorbed liquid circulation pipe 10.

As shown in FIGS. 2 to 4, the absorption liquid flowing through the absorption liquid circulation pipe 10 extends substantially horizontally on the outside of the absorption tower 1 (rear side and right side in this embodiment), and the upper, middle, and

lower headers

11A , 11B, 11C. The absorbing liquid that has flowed into the upper header 11A flows from the header 11A into the plurality of upper spray tubes 6A. A plurality of spray nozzles 5A are connected to the upper spray tube 6A, and the absorbing liquid flowing into the upper spray tube 6A is sprayed from the spray nozzle 5A. The absorbing liquid that has flowed into the middle-stage header 11B flows from the header 11B into the plurality of middle-stage spray tubes 6B. A plurality of spray nozzles 5B are connected to the middle-stage spray tube 6B, and the absorbing liquid flowing into the middle-stage spray tube 6B is sprayed from the spray nozzle 5B. Further, the absorbing liquid that has flowed into the lower header 11C flows from the header 11C into the plurality of lower spray pipes 6C. A plurality of spray nozzles 5C are connected to the lower spray tube 6C, and the absorbing liquid flowing into the lower spray tube 6C is sprayed from the spray nozzle 5C.

The upper spray pipe 6A extends substantially horizontally along the front-rear direction so as to cross the gas flow passage 3 in the peripheral wall 2 of the absorption tower 1. The base end portion 12A of one side (the side connected to the header 11A and the rear side in this embodiment) of the spray pipe 6A in the extending direction is fixed to the peripheral wall 2 of the absorption tower 1 by a bolt or the like (two). The heavy tube seat is not shown), and the tip of the base end portion 12A extends out of the absorption tower 1 and is connected to the header 11A in the upper stage. The base end portion 12A is a portion of the total length area of the spray pipe 6A through which the peripheral wall 2 is inserted on one side in the extending direction and its vicinity. The extension direction of the spray pipe 6A may be another direction along the horizontal direction (for example, the left-right direction).

A support pipe 17 is arranged above the upper spray pipe 6A (vertically above in the present embodiment) in the peripheral wall 2 of the absorption tower 1 so as to extend substantially parallel to the spray pipe 6A. The support pipe 17 is a tube-shaped member (circular tubular in this embodiment) in which the absorbing liquid does not flow inside, and both ends of the support pipe 17 are arranged in the peripheral wall 2 (gas flow passage 3) of the absorbing tower 1. Has been done.

The middle-stage spray pipe 6B is substantially horizontal along a direction (left-right direction in the present embodiment) substantially orthogonal to the extension direction of the spray pipe 6A below the upper-stage spray pipe 6A in the peripheral wall 2 of the absorption tower 1. Extend. The base end portion 12B of one side (the side connected to the header 11B and the left side in this embodiment) of the spray pipe 6B in the extending direction is fixed to the peripheral wall 2 of the absorption tower 1 by a bolt or the like (double). The tube seat is not shown), and the tip of the base end portion 12B extends to the outside of the absorption tower 1 and is connected to the header 11B in the middle stage. The base end portion 12B is a portion of the total length area of the spray pipe 6B through which the peripheral wall 2 is inserted on one side in the extending direction and its vicinity.

The lower spray pipe 6C extends below the middle spray pipe 6B (vertically downward in this embodiment) in the peripheral wall 2 of the absorption tower 1 and extends substantially parallel to the spray pipe 6B. The base end portion 12C of one side (the side connected to the header 11C and the left side in this embodiment) of the spray pipe 6C in the extending direction is fixed to the peripheral wall 2 of the absorption tower 1 by a bolt or the like (double). The tube seat is not shown), and the tip of the base end portion 12C extends out of the absorption tower 1 and is connected to the lower header 11C. The base end portion 12C is a portion of the total length region of the spray pipe 6C through which the peripheral wall 2 is inserted on one side in the extending direction and its vicinity. The middle spray tube 6B and the lower spray tube 6C are fixed to the peripheral wall 2 of the absorption tower 1 on the same side (left side in this embodiment).

The spray tube 6 (6A, 6B, 6C) and the support tube 17 are made of a non-metal (for example, a resin material such as fiber reinforced plastic (FRP)) having excellent corrosion resistance and slurry wear resistance and a high linear expansion coefficient. It is formed. In this embodiment, considering the corrosive environment with a high chlorine concentration (for example, chlorine concentration of 20,000 to 35,000 ppm) in the absorption tower 1, it is not made of metal (for example, made of stainless steel), but has excellent corrosion resistance and slurry wear resistance, and is lightweight. It uses a cheap non-metal spray tube.

The tip portion 13A on the front side (the other side in the extension direction) of the upper spray pipe 6A is supported by the inner peripheral surface of the peripheral wall 2 of the absorption tower 1 via the upper pipe support member 16A, and is supported by the inner peripheral surface of the peripheral wall 2 of the absorption tower 1 and is supported by the middle spray pipe 6B. The tip portion 13B on the right side (the other side in the extension direction) is supported on the inner peripheral surface of the peripheral wall 2 of the absorption tower 1 via the pipe support member 16B in the middle stage, and is supported on the right side (in the extension direction) of the spray pipe 6C in the lower stage. The tip portion 13C on the other side) is supported on the inner peripheral surface of the peripheral wall 2 of the absorption tower 1 via the lower pipe support member 16C. Since the upper, middle, and lower spray support members 16 (16A, 16B, 16C) are configured in the same manner, the upper pipe support member 16A will be described below, and the middle and lower

pipe support members

16B, 16C will be described. Is omitted.

As shown in FIGS. 5 and 6, the pipe support member 16A restricts the movement of the spray pipe 6A in the direction (vertical direction and left-right direction) intersecting with the extending direction (front-back direction) of the spray pipe 6A, and The tip portion 13A of the spray tube 6A is supported so as to allow the spray tube 6A to move in the extending direction (front-back direction). The pipe support member 16A of the illustrated example has a fixing member 19 fixed to the inner peripheral surface of the peripheral wall 2 by welding or the like, and a pipe insertion member 20 mounted and fixed on the fixing member 19. The pipe insertion member 20 has an inner diameter slightly larger than the outer diameter of the tip portion 13A of the spray pipe 6A, and the tip portion 13A of the spray pipe 6A is slidably inserted and supported in the pipe length direction. The holes 21 are formed. Like the spray tube 6, the tube insertion member 20 of the present embodiment is made of a non-metal (for example, FRP) having excellent corrosion resistance and slurry wear resistance.

As shown in FIGS. 2 to 4, the spray tube 6 (6A, 6B, 6C) has an inner diameter and an outer diameter from the

base end portions

12A, 12B, 12C toward the

tip portions

13A, 13B, 13C (of the absorbing liquid). It has a circular tube shape with a tapered diameter (from the upstream side to the downstream side in the distribution direction). On the other hand, the support tube 17 has a uniform circular tube shape in which the inner diameter and the outer diameter do not expand or contract from one end to the other end.

Both ends of the support pipe 17 are open ends opened by the gas flow passage 3, and disk-shaped closing plates (closing members) 25 for closing the open ends are fixed to both ends of the support pipe 17 (FIG. 2). The closing plate 25 blocks the inflow of exhaust gas from the gas flow passage 3 into the support pipe 17.

Between the support pipe 17 and the upper spray pipe 6A, a brace (reinforcing member) 14A that tilts diagonally upward from the base end portion 12A side of the spray pipe 6A toward the tip portion 13A side and a brace (reinforcing member) 14A that tilts diagonally downward. The braces (reinforcing members) 14B are alternately arranged, and the support pipe 17 and the upper spray pipe 6A are connected by a plurality of braces 14 (14A, 14B). The upper end and the lower end of each brace 14 are fixed to the support pipe 17 and the upper spray pipe 6A by adhesion or the like, and the truss structure 15 (upper side) is formed by the support pipe 17, the upper spray pipe 6A, and the plurality of braces 14. The truss structure 15A) is formed.

Between the spray pipe 6B in the middle stage and the spray pipe 6C in the lower stage, there is a brace (reinforcing member) 14A that inclines diagonally upward from the base end portion 12C side of the spray pipe 6C toward the tip portion 13C side, and diagonally downward. Inclined braces (reinforcing members) 14B are alternately arranged, and the middle spray pipe 6B and the lower spray pipe 6C are connected by a plurality of

braces

14A and 14B. The upper and lower ends of the

braces

14A and 14B are fixed to the middle spray pipe 6B and the lower spray pipe 6C by adhesion or the like, and are trussed by the middle and

lower spray pipes

6B and 6C and the

braces

14A and 14B. Structure 15 (lower truss structure 15B) is formed. The brace 14 of the present embodiment is made of a non-metal (for example, FRP) having excellent corrosion resistance and slurry wear resistance, like the support tube 17 and the spray tube 6.

As described above, in the spray pipe of the present embodiment, the

spray pipes

6A, 6B, 6C of three stages (upper stage, middle stage, and lower stage) having different heights are provided, and the extension directions of the

spray pipes

6B, 6C of the middle stage and the lower stage. Is set in a direction substantially orthogonal to the extending direction of the upper spray pipe 6A, a support pipe 17 extending substantially parallel to the upper spray pipe 6A is provided, and the upper spray pipe 6A and the support pipe 17 are provided. A plurality of braces 14 are connected to form an upper truss structure 15A, and a middle stage spray pipe 6B and a lower stage spray pipe 6C are connected by a plurality of braces 14 to form a lower truss structure 15B. The base end portion 12A of the upper spray pipe 6A is fixed to the peripheral wall 2 of the absorption tower 1, and the tip end portion 13A is supported by the peripheral wall 2 so as to be movable in the extending direction of the spray pipe 6A. Both ends of the support pipe 17 are free ends that are not supported by the peripheral wall 2, and the support pipe 17 is supported by the upper spray pipe 6A by a plurality of braces 14. The

base end portions

12B and 12C of the middle and

lower spray pipes

6B and 6C are fixed to the peripheral wall 2 of the absorption tower 1, and the

tip portions

13B and 13C are supported by the peripheral wall 2 so as to be movable in the extending direction of the

spray pipes

6B and 6C. Will be done.

The number of stages of the spray pipe 6 is not limited to three, and may be one stage (only the upper spray pipe 6A of the present embodiment) or may be more than three stages. Further, the position where the support pipe 17 is provided is not limited to the upper part of the spray pipe 6 (in the present embodiment, the upper spray pipe 6A) which is the connection partner, but is another position (for example, the lower side of the spray pipe 6 of the connection partner). You may. For example, the upper spray pipe 6 and the middle spray pipe 6 extend substantially in parallel, and the extension direction of the lower spray pipe 6 is substantially orthogonal to the extension direction of the upper and middle spray pipes 6 in three stages. When the upper spray pipe 6 and the middle spray pipe 6 are connected by the truss structure 15, the support pipe 17 is arranged vertically below the lower spray pipe 6 and the lower spray pipe 6 is arranged. And the support pipe 17 may be connected by the truss structure 15. Further, one or both ends of the support pipe 17 can be moved with respect to the peripheral wall 2 by the pipe support member 16 in the extending direction of the support pipe 17, similarly to the

tip portions

13A, 13B, 13C of the spray pipe 6. May be supported (see Figure 2).

According to the present embodiment, the support pipe 17 is arranged in the absorption tower 1 so as to extend substantially parallel to the upper spray pipe 6A, and the upper spray pipe 6A and the support pipe 17 are provided with a plurality of reinforcing members (brace 14). Since the truss structure 15 is formed by connecting with the truss structure 15, even when there is no other spray pipe 6 to be combined as in the upper spray pipe 6A of the present embodiment, the truss structure 15 forms the spray pipe 6A. Can be reinforced. Therefore, it is not necessary to install a spray pipe support beam extending in a direction substantially orthogonal to the upper spray pipe 6A to support the spray pipe 6A from below in the absorption tower 1, and the support structure of the spray pipe 6 is simplified. be able to.

It is not necessary to install a spray pipe support beam extending substantially orthogonal to the spray pipe 6A in the absorption tower 1, and the support pipe 17 extending substantially parallel to the spray pipe 6A enables rectification of the exhaust gas, so that the flow resistance of the exhaust gas The increase in (pressure loss) can be suppressed.

Since the support tube 17 has a tube shape in which the absorbing liquid does not flow inside, it is possible to secure the desired strength while suppressing the weight increase of the support tube 17.

Since the inner diameter of the spray tube 6 through which the absorbent liquid flows is reduced from the upstream side to the downstream side, the absorbent liquid can be reliably supplied to the downstream end. On the other hand, for the support pipe 17 in which the absorbent liquid does not flow inside, a versatile pipe material having a uniform inner diameter and outer diameter from one end to the other end and the cross-sectional shape does not change in the longitudinal direction is used instead of a special shape. Can be done.

Since the open end of the support pipe 17 is closed by the closing plate 25, the inside of the support pipe 17 can be shielded from the gas flow passage 3 to prevent the inflow of exhaust gas. Therefore, it is possible to suppress an increase in the flow resistance (pressure loss) of the exhaust gas due to the exhaust gas flowing into the inside of the support pipe 17.

The front side of the upper truss structure 15A is movably supported in the front-rear direction (the extension direction of the upper spray pipe 6A and the support pipe 17), and the total length (length in the front-rear direction) of the truss structure 15A is not restricted.

Insert the middle and

lower spray pipes

6B and 6C into the gas flow passage 3 from the same direction (both on the left side in this embodiment), and insert the left

base end portions

12B and 12C of the middle and

lower spray pipes

6B and 6C. Since it is fixed to the absorption tower 1 side, the heat expansion direction of the spray tube 6B in the middle stage and the heat expansion direction of the spray tube 6C in the lower stage are in the same direction (both are in the right direction in this embodiment). Further, the right side of the lower truss structure 15B is movably supported in the left-right direction (extending direction of the

spray tubes

6B and 6C), and the total length (length in the left-right direction) of the truss structure 15B is not restricted.

Therefore, it is possible to sufficiently absorb the thermal elongation of the spray pipe 6 (6A, 6B, 6C), suppress the thermal stress generated in the truss structure 15 (15A, 15B) to a small value, and make it a non-metal product having a high linear expansion coefficient. Even when the spray tube 6 is used, it is possible to prevent the spray tube 6 and the peripheral wall 2 of the absorption tower 1 from being damaged due to the thermal expansion of the spray tube 6.

(Second Embodiment)
The second embodiment of the present invention is different from the first embodiment in that the brace 14 is connected to the spray pipe 6 and the support pipe 17. Therefore, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Since the connection mode between the upper spray pipe 6A and the support pipe 17 and the connection mode between the middle spray pipe 6B and the lower spray pipe 6C are configured in the same manner, the upper section is described below. The connection mode between the spray pipe 6A and the support pipe 17 will be described, and the description of the connection mode between the spray pipe 6B in the middle stage and the spray pipe 6C in the lower stage will be omitted.

As shown in FIGS. 7 and 8, the

braces

14A and 14B of the present embodiment are allowed to move in the front-rear direction (extended direction) with respect to the support pipe 17, and the support pipe 17 and the upper spray are allowed to move. It is connected to the pipe 6A. In the illustrated example, the brace connecting plate 22 of the support pipe 17 is provided with an elongated hole 23 extending in the front-rear direction, and the diameter of the elongated hole 23 is provided at the tip of the shaft portion through which the elongated hole 23 is inserted at the upper ends of the

braces

14A and 14B. A locking protrusion 24 having a head having a larger diameter is integrally provided. By inserting the shaft portion of the locking protrusion 24 into the elongated hole 23, the upper ends of the

braces

14A and 14B are restricted from moving in the vertical and horizontal directions with respect to the support tube 17, and move in the front-rear direction. Is connected to the support tube 17 in an allowed state. It should be noted that the lower end portions of the

braces

14A and 14B may be connected to the upper spray pipe 6A in a state where movement in the front-rear direction is permitted as in the upper end portion, and may be simply connected to the upper end spray pipe 6A. It may be rotatably connected. That is, the

braces

14A and 14B may be in a state where movement in the extending direction is permitted with respect to at least one of the support pipe 17 and the upper spray pipe 6A.

According to the present embodiment, the

braces

14A and 14B are generated in the truss structure 15A because the support pipe 17 and the upper spray pipe 6A are connected in a state where the support pipe 17 is allowed to move in the front-rear direction. The thermal stress can be further suppressed.

(Third Embodiment)
In the third embodiment of the present invention, the form of the pipe support member 16 is different from that of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the following, the pipe support member 16A of the upper spray pipe 6A will be described on behalf of the pipe support member 16 of each stage.

As shown in FIG. 9, the pipe support member 16A of the present embodiment is supported in a state of being slidably engaged only in the front-rear direction with the fixing member 19 fixed to the inner peripheral surface of the peripheral wall 2. The pipe insertion hole 21 formed in the pipe insertion member 20 has an inner diameter substantially equal to the outer diameter of the tip portion 13A of the spray tube 6A, and the tip portion 13A of the spray tube 6A is in a state where the pipe insertion hole 21 is inserted. It is fixed to the pipe insertion member 20 by adhesion or the like. Due to the sliding movement of the pipe insertion member 20 with respect to the fixing member 19, the tip portion 13A of the spray pipe 6A moves in the front-rear direction. The form of the pipe support member 16 is not limited to the first embodiment and the present embodiment, and may be another form.

(Fourth Embodiment)
In the fourth embodiment of the present invention, the materials and arrangement of the spray pipe 6 and the support pipe 17 are different from those in the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The spray pipe 6 and the support pipe 17 of the present embodiment are made of metal (for example, made of stainless steel), which is harder to expand thermally than the resin. As shown in FIG. 10, the three-

stage spray tubes

6A, 6B, and 6C are vertically separated from each other and extend substantially horizontally and substantially in parallel in the same direction (in the front-back direction in this embodiment). The upper and

lower spray pipes

6A and 6C are inserted into the absorption tower 1 from the rear side of the absorption tower 1, and the

base end portions

12A and 12C on the rear side of the

spray pipes

6A and 6C are fixed to the peripheral wall 2. Will be done. The middle-stage spray tube 6B is inserted into the absorption tower 1 from the front side of the absorption tower 1, and the base end portion 12B on the front side of the spray tube 6B is fixed to the peripheral wall 2. The support pipe 17 is arranged vertically above the upper spray pipe 6A, and the front end portion 18 of the support pipe 17 is fixed to the peripheral wall 2 via the support pipe fixing member 26. In this way, the spray pipe 6 and the support pipe 17 are cantileveredly supported by the peripheral wall 2. The upper spray pipe 6A and the support pipe 17 are connected by a plurality of braces 14 to form an upper truss structure 15A, and the middle spray pipe 6B and the lower spray pipe 6C are connected by a plurality of braces 14. Form the lower truss structure 15B. As a result, both ends of the upper truss structure 15A and both ends of the lower truss structure 15B are fixedly supported by the peripheral wall 2, respectively.

The support pipe fixing member 26 also functions as a closing member for closing the opening end on the front side of the support pipe 17, and the opening end on the rear side of the support pipe 17 is closed by the closing plate 25.

According to the present embodiment, since the front and rear opening ends of the support pipe 17 are closed by the support pipe fixing member 26 and the closing plate 25, the inside of the support pipe 17 is shielded from the gas flow passage 3 to allow the inflow of exhaust gas. Can be stopped. Therefore, even when the support pipe 17 is formed of a material (for example, steel material) that is easily corroded by the exhaust gas containing the absorbing liquid, the inner peripheral surface of the support pipe 17 is subjected to corrosion resistance treatment (for example, coating). It is possible to prevent corrosion of the inner peripheral surface of the support pipe 17.

It should be noted that the present invention is not limited to the above-described embodiments and modifications described as examples, and is not limited to the above-mentioned embodiments and the like as long as it does not deviate from the technical idea of the present invention. , Various changes are possible depending on the design and the like.

For example, the tubular shape of the peripheral wall 2 of the absorption tower 1 is not limited to a cylindrical shape, and other shapes (for example, the front wall and the rear wall separated in the front-rear direction and the left wall and the right wall separated in the left-right direction are substantially vertical. It may be a rectangular shape that stands upright.

Further, in the above embodiment, the support pipe 17 is arranged above or below the spray pipe 6 (6A), and the spray pipe 6 and the support pipe 17 are connected by the brace 14, but the present invention is abbreviated as the spray pipe 6. The support pipes 17 may be arranged so as to be adjacent to each other in the horizontal direction (for example, front-back or left-right), and the spray pipe 6 and the support pipe 17 may be connected by a brace 14 to form a truss structure 15.

1: Absorption tower (desulfurization absorption tower)
2: Peripheral wall 3: Gas flow passage 4:

Inlet duct

5,5A, 5B, 5C:

Spray nozzle

6,6A, 6B, 6C: Spray pipe 10: Absorbent

liquid circulation pipe

11A, 11B, 11C:

Header

12A, 12B, 12C: Base end of

spray pipe

13A, 13B, 13C: Tip of

spray pipe

14A, 14B: Brace (reinforcing member)
15, 15A, 15B:

Truss structure

16, 16A, 16B, 16C: Pipe support member 17: Support pipe 18: Front end of support pipe 19: Fixing member 20: Pipe insertion member 21: Pipe insertion hole 22: Brace connecting plate 23 : Long hole 24: Locking protrusion

Claims

The spray tube that sends the absorption liquid to the spray nozzle extends substantially horizontally in the absorption tower, and the absorption liquid is supplied from the spray nozzle into the exhaust gas flowing through the gas flow passage in the absorption tower to remove sulfur oxides in the exhaust gas. It is a spray tube support structure of a flue gas desulfurization device that absorbs with an absorbent liquid.
A support tube that has a tube shape in which the absorbent liquid does not flow inside and extends substantially parallel to the spray tube in the absorption tower.
A spray pipe support structure for a flue gas desulfurization apparatus, comprising a plurality of reinforcing members for connecting the spray pipe and the support pipe to form a truss structure.
The spray tube support structure according to claim 1.
The spray tube has a circular tube shape in which the inner diameter is reduced from the upstream side to the downstream side in the flow direction of the absorbing liquid.
The support tube is a spray tube support structure of a flue gas desulfurization apparatus, characterized in that the inner diameter does not expand or contract from one end to the other end and has a uniform circular tube shape.
The spray tube support structure according to claim 1 or 2.
One end or both ends of the support pipe are open ends opened in the gas flow passage.
A spray pipe support structure of a flue gas desulfurization apparatus, characterized in that a closing member for closing the open end is fixed to the support pipe.