JP2022060059A - Spray piping structure of exhaust gas desulfurizer - Google Patents

Abstract

To provide a spray piping structure of an exhaust gas desulfurizer capable of suppressing adhesion of absorbent to a spray pipe support beam, arranging a spray nozzle to the vicinity of a spray pipe support beam for acquiring a desired desulfurization performance, suppressing increase of inflow resistance of the absorbent to the nozzle connection pipe from the spray pipe, and fitting firmly, the nozzle connection pipe to the spray pipe by a simple processing step.MEANS FOR SOLVING THE PROBLEM: A plurality of nozzle connection pipes 12 is branched from a spray pipe 6, and a spray nozzle 5 is fitted to the nozzle connection pipe 12. An inclined pipe part 17 of the nozzle connection pipe 12 is coupled to a lower part of a peripheral face in an area not crossing the spray pipe support beam 13 out of the spray pipe 6, and extends from the spray pipe 6 so as to incline downward obliquely to a horizontal direction. An inclination direction of the inclined pipe part 17 is set so that, a virtual pipe 19 in which the inclined pipe part 17 extends in the spray pipe 6 passes a center 20 of the spray pipe 6, and an injection hole 16 of the spray nozzle 5 is provided below the spray pipe support beam 13.SELECTED DRAWING: Figure 3

Description

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

A desulfurization device (wet limestone-plaster flue gas desulfurization device) has been put into practical use as a device for removing sulfur oxides from exhaust gas containing sulfur oxides generated in a coal-fired boiler of a thermal power plant. Some conventional desulfurization devices are provided with an absorption tower that divides the gas flow space, and a plurality of spray nozzles are arranged in the gas flow space. Sulfur oxides are removed from the exhaust gas by injecting and contacting the exhaust gas introduced into the absorption tower and flowing downward in the gas flow space from the lower side to the upper side by injecting the absorbing liquid downward from each spray nozzle.

In the desulfurization device that injects the absorption liquid from the spray nozzle, a plurality of spray pipes for supplying the absorption liquid to the spray nozzle are arranged in the gas flow space of the absorption tower. The plurality of spray pipes extend substantially parallel to each other in the flow path cross section (horizontal cross section) of the gas flow space. In order to arrange the spray nozzle at a desired position, a structure is known in which a plurality of nozzle connecting tubes are connected to the spray tube and the spray nozzle is attached to each nozzle connecting tube. The absorbing liquid flows from the spray pipe into the nozzle connecting pipe and is ejected from the spray nozzle. As an example of the nozzle connecting pipe, Patent Document 1 discloses two (pair) nozzle connecting pipes extending horizontally from the lower part of the peripheral surface of the spray pipe so as to be separated from each other.

In addition, in order to stably support the spray pipe, a spray pipe support beam that extends substantially horizontally below the spray pipe so as to intersect the spray pipe is fixed to the absorption tower, and the spray pipe is lowered by the spray pipe support beam. The structure supported by the above is known (for example, Patent Document 2). The spray pipe support beam and the nozzle connecting pipe are arranged so as not to overlap each other.

Gazette No. 6-61423 Japanese Unexamined Patent Publication No. 7-241436

When the spray pipe in which the two nozzle connecting pipes extend so as to be separated from each other in the horizontal direction from the lower part of the peripheral surface of the spray pipe as in Patent Document 1 is supported from below by the spray pipe support beam as in Patent Document 2. The lower end of the nozzle connecting pipe and the upper end of the spray pipe support beam are arranged at substantially the same height. Therefore, the injection port of the spray nozzle cannot be arranged so as to be separated downward from the lower end of the spray support member, and the absorption liquid injected from the spray nozzle is likely to adhere to the spray pipe support beam. In particular, when the distance in the height direction from the nozzle connecting pipe to the injection port of the spray nozzle is shorter than the width in the height direction of the spray pipe support beam, the injection port of the spray nozzle is above the lower end of the spray pipe support beam. Since it is located, the absorbing liquid may collide with the spray pipe support beam, and if it collides, the absorbing liquid is not evenly distributed on the same plane and the desulfurization rate decreases. In addition, the absorbing liquid easily adheres to the spray pipe support beam. When the absorbent liquid adheres to the spray pipe support beam, solid content in the absorbent liquid accumulates, which causes corrosion and wear of the spray pipe support beam. Further, as the accumulation of solid content progresses, the flow resistance of the exhaust gas increases and the pressure loss increases.

In order to avoid such inconvenience, if the spray nozzle is largely separated from the spray pipe support beam in the horizontal direction so as to avoid the spray pipe support beam, a region where the absorbent liquid is diluted is generated vertically below the spray pipe support beam. The desulfurization performance deteriorates as the exhaust gas slips through the region where the absorption liquid is thin.

Further, in a structure as in Patent Document 1 in which two nozzle connecting tubes extend from the lower portion of the peripheral surface of the spray tube so as to be separated from each other in the horizontal direction, the base end portion of the nozzle connecting tube (the end portion connected to the spray tube). ), An arcuate base end connection portion is formed in which the lower portions of the peripheral surfaces of the two nozzle connection pipes are continuous in a straight line, and the inner surface of the base end connection portion faces the inside of the spray pipe. Since the inner surface of this base end connection portion faces substantially perpendicular to the flow of the absorbing liquid from the spray pipe to the nozzle connecting pipe, the inflow resistance of the absorbing liquid from the spray pipe to the nozzle connecting pipe increases, and the absorbing liquid It may be necessary to increase the pump power to supply.

Further, the proximal end connecting portion formed at the proximal end portion of the nozzle connecting tube is a portion that is not connected to the spray tube in the entire peripheral region of the proximal end portion of the nozzle connecting tube. That is, the structure is such that a part of the entire area in the circumferential direction of the base end portion of the nozzle connecting pipe is not connected to the spray pipe. Therefore, the processing work when attaching the nozzle connecting pipe to the spray pipe is complicated, which leads to an increase in manufacturing cost. Further, it may not be possible to sufficiently secure the mounting strength of the nozzle connecting pipe to the spray pipe.

Therefore, in the present invention, the spray nozzle can be arranged in the vicinity of the spray pipe support beam while suppressing the adhesion of the absorbing liquid to the spray pipe support beam to obtain the desired desulfurization performance, and the absorption from the spray pipe to the nozzle connecting pipe can be obtained. It is an object of the present invention to provide a spray piping structure capable of suppressing an increase in liquid inflow resistance and firmly attaching a nozzle connecting pipe to a spray pipe by a simple processing operation.

In order to achieve the above object, the present invention is a spray piping structure of a flue gas desulfurization apparatus, and exhaust gas flows from the bottom to the top in the gas flow space in the absorption tower. In the gas flow space, a spray pipe extending substantially horizontally and linearly is arranged, and a spray pipe support beam extending substantially horizontally below the spray pipe is fixed to the absorption tower so as to intersect with the spray pipe. The spray pipe is supported from below by the support beam. A plurality of nozzle connecting pipes branch from the spray pipe, and the spray nozzle is attached to the nozzle connecting pipe. The absorption liquid is injected downward from the injection port of the spray nozzle, and the sulfur oxides in the exhaust gas flowing in the gas flow space are absorbed by the absorption liquid.

The nozzle connecting tube has an inclined tube portion. The inclined pipe portion is connected to the lower part of the peripheral surface of the region of the spray pipe that does not intersect with the spray pipe support beam (non-crossing region), and extends from the spray pipe so as to incline diagonally downward with respect to the horizontal direction. The inclination direction of the inclined pipe portion is set so that the virtual pipe extending the inclined pipe portion into the spray pipe passes through the center (tube axis) of the spray pipe. The injection port of the spray nozzle is arranged at substantially the same height as the lower end of the spray pipe support beam or below the lower end of the spray pipe support beam.

In the above configuration, the inclined pipe portion of the nozzle connecting pipe is connected to the lower part of the peripheral surface of the non-intersecting region of the spray pipe that does not intersect with the spray pipe support beam, and is inclined from the spray pipe diagonally downward with respect to the horizontal direction. The injection port of the extended spray nozzle is arranged at substantially the same height as the lower end of the spray pipe support beam or below the lower end of the spray pipe support beam. Since the absorbent liquid is injected downward from the injection port of the spray nozzle, the injection direction of the absorbent liquid faces downward from the lower end of the spray pipe support beam over the entire injection range. Therefore, even when the spray nozzle is arranged in the vicinity of the spray pipe support beam without significantly separating the spray nozzle from the spray pipe support beam in the horizontal direction so as to avoid the spray pipe support beam, the spray pipe support beam can be provided. Adhesion of the absorbent liquid can be suppressed. Further, by arranging the spray nozzle in the vicinity of the spray pipe support beam, desired desulfurization performance can be obtained.

Since the inclined direction of the inclined pipe portion is set so that the virtual pipe extending the inclined pipe portion into the spray pipe passes through the center of the spray pipe, the absorbing liquid can be smoothly flowed from the spray pipe to the nozzle connecting pipe. .. As a result, it is possible to suppress an increase in resistance (inflow resistance) when the absorbing liquid flows from the spray pipe to the nozzle connecting pipe, and it is possible to suppress an increase in the power of the pump for supplying the absorbing liquid.

Since the inclined pipe portion extends from the lower portion of the peripheral surface of the spray pipe so as to incline diagonally downward, the entire circumference of the base end portion (end portion connected to the spray pipe) of the inclined pipe portion is connected to the spray pipe. Therefore, the nozzle connecting pipe can be firmly attached to the spray pipe by a simple processing operation.

A second aspect of the present invention is the spray piping structure of the first aspect, wherein the nozzle connecting pipe has a horizontal pipe portion that is bent from the tip of the inclined pipe portion and extends substantially horizontally, and the spray nozzle is horizontal. It is attached to the pipe part.

In the above configuration, since the nozzle connecting pipe bends at the boundary between the inclined pipe portion and the horizontal pipe portion, a vortex is generated in the absorbing liquid flowing through the nozzle connecting pipe. Due to the generation of such a vortex, the droplets of the absorbing liquid ejected from the spray nozzle can be made finer, and the absorption performance of the sulfur oxide by the absorbing liquid can be improved. In addition, since the vortex creates a suitable flow resistance between the base end of the nozzle connecting tube and the spray nozzle, it is difficult for the supply amount of the absorption liquid to be biased among the plurality of spray nozzles, and the absorption liquid from each spray nozzle is less likely to be biased. It is possible to make the supply amount uniform.

A third aspect of the present invention is the spray piping structure of the first or second aspect, in which the inclined pipe portion extends downward from the spray pipe support beam, and the injection port of the spray nozzle is the spray pipe support beam. It is placed below the bottom edge.

In the above configuration, since the inclined pipe portion extends downward from the spray pipe support beam, the injection port of the spray nozzle can be arranged so as to be separated downward from the lower end of the spray pipe support beam, and the absorption liquid to the spray pipe support beam can be arranged. It is possible to enhance the effect of suppressing the adhesion of.

A fourth aspect of the present invention is the spray piping structure of the second aspect, in which the inclined pipe portion extends downward from the spray pipe support beam. The horizontal pipe portion and the spray nozzle are arranged below the lower end of the spray pipe support beam.

In the above configuration, since the inclined pipe portion extends downward from the spray pipe support beam, the injection port of the spray nozzle can be arranged so as to be separated downward from the lower end of the spray pipe support beam as in the third aspect. It is possible to enhance the effect of suppressing the adhesion of the absorbing liquid to the spray pipe support beam.

Further, since the horizontal pipe portion and the spray nozzle are arranged below the lower end of the spray pipe support beam, the injection port of the spray pipe can be extended to the lower side of the spray pipe support beam by extending the horizontal pipe portion toward the lower side of the spray pipe support beam. Can be placed vertically below. By arranging the injection port of the spray nozzle vertically below the spray pipe support beam, the desulfurization performance can be further improved.

According to the present invention, the spray nozzle is arranged in the vicinity of the spray pipe support beam while suppressing the adhesion of the absorption liquid to the spray pipe support beam to obtain the desired desulfurization performance, and the absorption liquid from the spray pipe to the nozzle connecting pipe is obtained. It is possible to suppress the increase in the inflow resistance of the nozzle and to firmly attach the nozzle connecting pipe to the spray pipe by a simple processing work.

It is a figure which shows typically the structure of the flue gas desulfurization apparatus which concerns on 1st Embodiment of this invention. FIG. 3 is a plan view of the spray piping structure of FIG. 1 as viewed from above. FIG. 3 is a cross-sectional view of a main part of the spray piping structure of FIG. 2 as viewed from the front. It is an enlarged view of the IV part of the spray piping structure of FIG. FIG. 3 is a plan view of the spray piping structure of FIG. 3 as viewed from above. It is sectional drawing of the main part which looked at the spray piping structure of 2nd Embodiment from the front. FIG. 6 is a plan view of the spray piping structure of FIG. 6 as viewed from above. FIG. 3 is a plan view of another form of the spray tube and the header as viewed from above.

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.

(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 FIG. 1, 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 space 3 extending in the vertical direction. An inlet duct 4 is connected to the front side of the peripheral wall 2, and exhaust gas from a boiler (not shown) is introduced into the gas flow space 3 via the inlet duct 4. The introduced exhaust gas circulates in the gas distribution space 3 from the bottom to the top.

A large number of spray nozzles 5 are installed in the upper part of the gas flow space 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 absorbing liquid is sprayed (sprayed) downward from the injection port 16 (see FIG. 3) as fine droplets, and the sprayed droplets are brought into contact with the exhaust gas flowing upward. The sulfur oxide in the exhaust gas is absorbed and removed by the absorbing liquid supplied from the spray nozzle 5. The minute droplets accompanying the exhaust gas flow are removed by a mist eliminator (not shown) installed on the gas outlet 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. 2, the spray piping structure of the present embodiment branches from one header (spray header) 11, a plurality of spray pipes (spray header branch pipes) 6 branching from the header 11, and each spray pipe 6. A plurality of nozzle connecting pipes 12 are provided, and one spray nozzle 5 is attached to each spray connecting pipe 12.

The header 11 extends substantially horizontally along the left-right direction so as to cross the gas flow space 3 in the peripheral wall 2 of the absorption tower 1. The base end portion 11a on one side (right side in the example of FIG. 2) of the header 11 in the extending direction is fixed to the peripheral wall 2 of the absorption tower 1 by a bolt or the like (double pipe seat not shown), and the base end portion is formed. The tip (right end) of 11a extends out of the absorption tower 1 and is connected to the absorption liquid circulation pipe 10 (see FIG. 1). The header 11 has a circular tube shape in which the inner and outer diameters are gradually reduced from the base end portion 11a toward the tip end portion 11b (from the upstream side to the downstream side in the flow direction of the absorbing liquid). The header 11 may have another shape (for example, a tapered circular tube shape that continuously reduces the diameter).

The spray pipe 6 branches from the header 11 in the gas flow space 3 and extends substantially horizontally and linearly toward the front or the rear. In front of the header 11 (header front space), a plurality of spray tubes 6 extending forward from the header 11 are arranged substantially in parallel with each other separated in the left-right direction, and behind the header 11 (header rear space), from the header 11 to the rear. A plurality of extending spray tubes 6 are arranged substantially in parallel with each other separated in the left-right direction. The spray tube 6 may have a circular tube shape in which the inner diameter and the outer diameter are uniform from the proximal end portion to the distal end portion, and the inner diameter and the outer diameter may be stepwise or continuously from the proximal end portion to the distal end portion. It may have a circular tube shape with a reduced diameter. Further, each extension direction of the header 11 and the spray pipe 6 is another direction along the horizontal direction (for example, the header 11 is extended in the front-rear direction, the spray pipe 6 is extended in the left-right direction, and the like). You may.

Below the spray pipe 6, a plurality of spray pipe support beams 13 (in the example of FIG. 2, one in the space in front of the header and two in the space behind the header, a total of three) are arranged. The spray pipe support beam 13 extends substantially horizontally in the left-right direction so as to be substantially orthogonal to the spray pipe 6, and both ends (left and right ends) of the spray pipe support beam 13 are fixed and supported by the peripheral wall 2 of the absorption tower 1. Will be done. The spray pipe support beam 13 in the header front space supports a plurality of spray pipes 6 extending forward from the header 11 from below, and the spray pipe support beam 13 in the header rear space supports a plurality of spray pipes 6 extending rearward from the header 11. Is supported from below. The header 11 is indirectly supported by the spray pipe support beam 13.

As shown in FIG. 3, the nozzle connecting pipe 12 integrally includes the inclined pipe portion 17 and the horizontal pipe portion 18. The inclined pipe portion 17 is connected to the lower part of the peripheral surface of the region of the spray pipe 6 that does not intersect with the spray pipe support beam 13 (non-crossing region), and is straight from the spray pipe 6 so as to incline diagonally downward with respect to the horizontal direction. It extends like a shape. In the example of FIG. 3, the left and right inclined pipe portions 17 extend from the left side and the right side of the lower peripheral surface of the spray pipe 6 to the lower left side and the lower right side, respectively. The inclined direction of the inclined pipe portion 17 is set so that the virtual pipe 19 extending the inclined pipe portion 17 into the spray pipe 6 passes through the center (tube axis) 20 of the spray pipe 6 and the base end of the inclined pipe portion 17 (the inclined pipe portion 17). The upper end on the upstream side) opens toward the center 20 of the spray pipe 6. The virtual pipe 19 is a conceptual pipe extending linearly from the base end of the inclined pipe portion 17 along the inclined direction of the inclined pipe portion 17.

As shown in FIGS. 3 and 4, the inclined pipe portion 17 extends downward from the lower end (lower surface) of the spray pipe support beam 13. The horizontal pipe portion 18 bends from the tip end (lower end on the downstream side) of the inclined pipe portion 17 and extends substantially horizontally and linearly below the spray pipe support beam 13. The spray nozzle 5 is attached to the tip of the horizontal pipe portion 18 and is arranged below the lower end of the spray pipe support beam 13. The injection port 16 of the spray nozzle 5 injects the absorbing liquid below the lower end of the spray pipe support beam 13. Since the absorption liquid is injected downward from the injection port 16, the injection direction of the absorption liquid faces downward from the lower end of the spray pipe support beam 13 over the entire injection range. In the example of FIG. 3, the horizontal pipe portion 18 of the nozzle connecting pipe 12 on the left side extends from the tip of the inclined pipe portion 17 to the left side, and the horizontal pipe portion 18 of the nozzle connecting pipe 12 on the right side extends from the tip of the inclined pipe portion 17. Extend to the right. The shape of the inclined pipe portion 17 and the horizontal pipe portion 18 is not limited to a linear shape, and may be another shape (curved shape or the like).

As shown in FIGS. 1 to 3, the absorbent liquid flowing through the absorbent liquid circulation pipe 10 flows into the plurality of spray pipes 6 from the header 11, flows through the nozzle connection pipe 12, and is transmitted from the injection port 16 of the spray nozzle 5. It is sprayed downward.

According to the present embodiment, as shown in FIGS. 3 and 4, the inclined pipe portion 17 of the nozzle connecting pipe 12 is connected to the lower peripheral surface of the non-crossing region of the spray pipe 6 that does not intersect with the spray pipe support beam 13. It extends from the spray pipe 6 so as to be inclined diagonally downward with respect to the horizontal direction, and the injection port 16 of the spray nozzle 5 is arranged below the lower end of the spray pipe support beam 13. Therefore, even when the spray nozzle 5 is arranged in the vicinity of the spray pipe support beam 13 without significantly separating the spray nozzle 5 from the spray pipe support beam 13 in the horizontal direction so as to avoid the spray pipe support beam 13. Adhesion of the absorbing liquid to the pipe support beam 13 can be suppressed. Further, by arranging the spray nozzle 5 in the vicinity of the spray pipe support beam 13, the absorbing liquid can be evenly sprayed over the entire cross section of the flow path of the gas flow space 3, and the desired desulfurization performance can be obtained.

Since the inclined direction of the inclined pipe portion 17 is set so that the virtual pipe 19 extending the inclined pipe portion 17 into the spray pipe 6 passes through the center 20 of the spray pipe 6, as shown by an arrow 21 in FIG. , The absorbing liquid can be smoothly flowed from the spray pipe 6 to the nozzle connecting pipe 12. As a result, it is possible to suppress an increase in resistance (inflow resistance) when the absorption liquid flows from the spray pipe 6 to the nozzle connection pipe 12, and suppress an increase in the power of the absorption liquid circulation pump 9 for supplying the absorption liquid. be able to.

Since the inclined pipe portion 17 extends from the lower portion of the peripheral surface of the spray pipe 6 so as to incline diagonally downward, the entire circumference of the base end portion (end portion connected to the spray pipe 6) of the inclined pipe portion 17 is the spray pipe 6. Connected to. Therefore, the nozzle connecting pipe 12 can be firmly attached to the spray pipe 6 by a simple processing operation.

Since the inclined pipe portion 17 extends downward from the lower end of the spray pipe support beam 13, the injection port 16 of the spray nozzle 5 can be arranged so as to be separated downward from the lower end of the spray pipe support beam 13, and the spray pipe support beam 13 can be arranged. It is possible to enhance the effect of suppressing the adhesion of the absorption liquid to the water.

Since the nozzle connecting pipe 12 bends at the boundary between the inclined pipe portion 17 and the horizontal pipe portion 18, a vortex flow 22 (see FIG. 4) is generated in the absorbing liquid flowing through the nozzle connecting pipe 12. Due to the generation of the vortex 22, the droplets of the absorbing liquid ejected from the spray nozzle 5 can be made finer, and the absorption performance of the sulfur oxide by the absorbing liquid can be improved. Further, since the vortex flow 22 causes a suitable flow resistance between the base end portion of the nozzle connecting pipe 12 and the spray nozzle 5, it becomes difficult for the absorption liquid to be unevenly distributed among the plurality of spray nozzles 5, and each spray nozzle 5 is less likely to be biased. It is possible to make the supply amount of the absorption liquid from the above uniform.

Further, since the horizontal pipe portion 18 and the spray nozzle 5 are located below the spray pipe support beam 13, as shown in FIG. 5, the horizontal pipe portion 18 of the nozzle connecting pipe 12A adjacent to the spray pipe support beam 13 is supported by the spray pipe. By extending the beam 13 downward, the injection port 16 of the spray nozzle 5 can be arranged vertically below the spray pipe support beam 13. By arranging the injection port 16 of the spray nozzle 5 vertically below the spray pipe support beam 13, the desulfurization performance can be improved.

(Second Embodiment)
In the second embodiment of the present invention, the height of the injection port 16 of the spray nozzle 5 is different from that of the first embodiment, and other configurations are common to 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.

As shown in FIG. 6, the injection port 16 of the spray nozzle 5 is arranged at substantially the same height (substantially the same level) as the lower end (lower surface) of the spray pipe support beam 13, and the injection direction of the absorbing liquid is the entire injection range. It faces downward from the lower end of the spray pipe support beam 13. The inclined pipe portion 17 extends diagonally downward from the base end toward the tip end so that the injection port 16 is located at substantially the same height as the lower end of the spray pipe support beam 13. As shown in FIG. 7, the spray nozzle 5 is arranged and attached to the nozzle connecting pipe 12A adjacent to the spray pipe support beam 13 in the vicinity of the side of the spray pipe support beam 13. Also in the second embodiment, the same effect as that of the first embodiment can be obtained.

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, the form of the spray tube 6 and the header 11 is not limited to the above embodiment, and may be another form. For example, as shown in FIG. 8, a plurality of headers 15 are arranged outside the absorption tower 1 (rear side in the example of FIG. 8) and extend substantially horizontally along a predetermined direction (front-back direction in the example of FIG. 8). The spray pipe 14 may be arranged so as to cross the gas flow space 3 in the peripheral wall 2 of the absorption tower 1. In the example of FIG. 8, a plurality of spray pipes 14 are arranged substantially in parallel with each other separated in the left-right direction, and the rear end portion of the spray pipe 14 is fixed to the peripheral wall 2 of the absorption tower 1 by a bolt or the like (double pipe). The seat is not shown). The tip of the rear end of the spray pipe 14 extends to the outside of the absorption tower 1 and is connected to the header 15, and the absorption liquid circulation pipe 10 (see FIG. 1) is connected to the header 15. A plurality of (three) spray pipe support beams 13 extending in the left-right direction are arranged below the spray pipe 14 in the gas flow space 3, and the spray pipe 14 is supported by the spray pipe support beam 13. Similar to the above embodiment, a plurality of nozzle connecting pipes 12 are branched from each spray pipe 14, and each nozzle connecting pipe 12 has an inclined pipe portion 17 and a horizontal pipe portion 18 integrally (see FIG. 3).

Further, although the spray nozzle 5 is attached to the horizontal pipe portion 18 in the above embodiment, the horizontal pipe portion 18 may be omitted and the spray nozzle 5 may be attached to the inclined pipe portion 17.

The materials of the spray tubes 6, 14, the headers 11 and 15, and the nozzle connecting tube 12 are not particularly limited, and are metal (for example, stainless steel) and non-metal (for example, resin such as fiber reinforced plastics (FRP)). Any material can be selected from.

1: Absorption tower (desulfurization absorption tower)
2: Peripheral wall 3: Gas flow space 4: Inlet duct 5: Spray nozzle 6, 14: Spray pipe 9: Absorbent liquid circulation pump 10: Absorbent liquid circulation pipe 11, 15: Header 12: Nozzle connection pipe 13: Spray pipe support beam 16 : Spout 17: Inclined pipe 18: Horizontal pipe 19: Virtual pipe 20: Center of spray pipe

Claims (4)

Exhaust gas flows from the bottom to the top in the gas flow space in the absorption tower, and a spray pipe extending substantially horizontally and linearly is arranged in the gas flow space, and is substantially below the spray pipe so as to intersect with the spray pipe. A horizontally extending spray pipe support beam is fixed to the absorption tower, the spray pipe is supported from below by the spray pipe support beam, and a plurality of nozzle connection pipes branch from the spray pipe to the nozzle connection pipe. It is a spray pipe structure of a flue gas desulfurization device to which a spray nozzle is attached, and the absorption liquid is jetted downward from the injection port of the spray nozzle to absorb the sulfur oxide in the exhaust gas flowing in the gas flow space with the absorption liquid.
The nozzle connecting pipe is connected to the lower part of the peripheral surface of the spray pipe in a region that does not intersect with the spray pipe support beam, and has an inclined pipe portion extending from the spray pipe so as to be inclined diagonally downward with respect to the horizontal direction. death,
The tilting direction of the inclined pipe portion is set so that a virtual pipe extending the inclined pipe portion into the spray pipe passes through the center of the spray pipe.
The spray piping structure of the flue gas desulfurization apparatus, wherein the injection port of the spray nozzle is arranged at substantially the same height as the lower end of the spray pipe support beam or below the lower end of the spray pipe support beam. The spray piping structure according to claim 1.
The nozzle connecting pipe has a horizontal pipe portion that bends from the tip of the inclined pipe portion and extends substantially horizontally.
The spray nozzle is a spray piping structure of a flue gas desulfurization apparatus, characterized in that it is attached to the horizontal pipe portion. The spray piping structure according to claim 1 or 2.
The inclined pipe portion extends downward from the spray pipe support beam and extends downward.
The spray piping structure of the flue gas desulfurization apparatus, wherein the injection port of the spray nozzle is arranged below the spray pipe support beam. The spray piping structure according to claim 2.
The inclined pipe portion extends downward from the spray pipe support beam and extends downward.
The spray piping structure of the flue gas desulfurization apparatus, wherein the horizontal pipe portion and the spray nozzle are arranged below the lower end of the spray pipe support beam.

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