JP3132957B2 - Support structure for ceramic nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a ceramic nozzle, and more particularly to a ceramic nozzle for spraying an absorbent slurry used in a spray type absorption tower of a flue gas desulfurization unit. Further, the present invention relates to a ceramic nozzle support structure capable of sufficiently supporting a load due to a reaction force at the time of slurry injection and protecting a ceramic nozzle that is vulnerable to impact from damage due to impact.

[0002]

2. Description of the Related Art In recent years, when exhaust gas is discharged from a thermal power plant or the like, a flue gas desulfurization device is installed to remove SO ₂ in the exhaust gas to prevent pollution. In a conventional flue gas desulfurization apparatus, for example, lime slurry is allowed to flow down as an SO ₂ absorbing solution into an absorption tower filled with a filler such as grit,
The exhaust gas is introduced into the absorption tower so as to flow countercurrently or cocurrently with the lime slurry. The SO ₂ gas in the exhaust gas dissolves in the lime slurry to become SO ₂ ions, and the Ca present in the lime slurry
Reacts with ions to produce CaSO ₄ . The CaSO
By removing ₄ , SO ₂ in the exhaust gas is removed.

[0003] However, in the above-mentioned conventional flue gas desulfurization apparatus, the phenomenon that the generated CaSO ₄ precipitates on fillers such as grit in the absorption tower often occurred. for that reason,
There has been a problem that the absorption capacity of the absorbing liquid is reduced, and furthermore, the flow resistance of the exhaust gas is increased, and as a result, the desulfurization performance is reduced. Since it takes a lot of time and labor to remove the generated CaSO ₄ from the filler, there has been a demand for the development of a gas-liquid contact system between the absorbent slurry and the exhaust gas instead of a packed absorption tower filled with grit or the like.

[0004]

In order to put such a spray type absorption tower into practical use, it is necessary to solve the following problems. First, since the absorbing slurry has a high abrasion property, the nozzle for spraying the absorbing slurry needs to be made of a material having excellent wear resistance. Nozzles made of metal such as steel, stainless steel, aluminum, etc. have extremely large nozzle wear and are difficult to put into practical use.The nozzles are made of hard ceramics with low wear, such as high alumina, zirconia, silicon carbide, tungsten carbide, etc. It is necessary to make.

Second, there is a need to develop a support structure for supporting a ceramic nozzle. Ceramic nozzles have the disadvantage that they are susceptible to impact, i.e., they are easily cracked when subjected to an impact, and cannot be directly fixed by a member made of a highly rigid material such as a metal member. Therefore, it is necessary that the support structure of the ceramic nozzle support the reaction force at the time of slurry injection and the weight of the nozzle itself, and protect the nozzle body from impact. Moreover, in the spray type absorption tower of the flue gas desulfurization unit,
Since it is necessary to inject a large amount of slurry, for example, 60 tons of limestone slurry per nozzle, a support structure for a ceramic nozzle capable of injecting such a large amount of limestone slurry is required. However, a support structure for supporting such a ceramic nozzle has not been proposed and put into practical use.

In order to solve the above-mentioned problems, the present invention provides a ceramic nozzle which sufficiently supports a reaction force at the time of slurry injection, and protects a ceramic nozzle which is vulnerable to impact from impact and prevents breakage. It is intended to provide a support structure.

[0007]

To achieve the above object, a ceramic nozzle support structure of the present invention has a ceramic nozzle having a raised portion on the outer peripheral surface of the nozzle body, and an opening larger than the outer shape of the nozzle body. A flange body having a larger inner diameter than the outer diameter of the nozzle body, a middle cylinder portion extending substantially concentrically with the opening from one surface of the flange body in a direction perpendicular to the flange body, and a wall of the middle cylinder portion; A fastening flange having a through hole, and a tubular body having an inner diameter larger than the outer diameter of the nozzle and the middle tubular portion of the fastening flange. The fastening flange is bolted to the flange body at the top of the tubular body. And a supporting nozzle connected to the nozzle, and the tightening flange accommodates the nozzle inside such that the nozzle body penetrates the opening of the tightening flange and the middle cylinder portion. The middle portion of the tightening flange is disposed in the support nozzle together with the nozzle, and the elastic resin is provided in the gap between the nozzle and the support nozzle such that the inside and outside of the middle portion of the tightening flange are integrated through the through hole. And a tightening flange and a support nozzle are bolted together via a flange body.

The support structure for a ceramic nozzle of the present invention can be applied regardless of the type of ceramic used as the nozzle material. For example, high-alumina, zirconia,
The present invention can be applied to a nozzle formed of silicon carbide (SiC), tungsten carbide (WC), or the like. Further, as the elastic resin used in the present invention, for example, a foamable resin such as a natural rubber, a butyl rubber or the like, which has a high impact absorbing ability, a vulcanized rubber, a urethane rubber, a silicone rubber, or a styrene foam can be used.

[0009]

In the support structure for a ceramic nozzle of the present invention, the combination of the raised portion provided on the outer peripheral surface of the nozzle body and the elastic resin functions as a stopper for receiving a reaction force in a direction opposite to the injection direction generated at the time of slurry injection. Then, the reaction force via the fastening flange is transmitted to the support nozzle to support the ceramic nozzle. In addition, an elastic resin is interposed between the clamping flange and the support nozzle to prevent direct contact between the nozzle and the clamping flange or between the nozzle and the support nozzle, protecting the ceramic nozzle from damage due to impact. can do.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a ceramic nozzle support structure according to an embodiment of the present invention.
FIG. 1 shows the structure of the ceramic nozzle support structure of the present embodiment, FIG. 2 shows a state in which the ceramic nozzle support structure is attached to a header pipe, and FIG. 3 shows the structure of a fastening flange fastened to the support nozzle. FIG. 4 shows the structure of the nozzle, and FIG. 5 shows a state in which the ceramic nozzle and the fastening flange are put in a mold and filled with an elastic resin. As shown in FIG. 2, a support structure 10 (hereinafter simply referred to simply as a support structure) for a ceramic nozzle of the present embodiment is a limestone slurry disposed in an absorption tower (not shown) of a flue gas desulfurization apparatus. It is attached to header pipe A. The support structure 10 has a structure capable of sufficiently supporting the reaction force applied to the nozzles even when the limestone slurry is sprayed at a rate of about 60 tons per hour per nozzle.

In this embodiment, as shown in FIG. 1, a ceramic nozzle support structure 10 includes a nozzle 12, a support nozzle 14 attached to a header pipe A, and a tightening flange 16 bolted to the support nozzle 14. With
The assembly between the nozzle 12 and the support nozzle 14 and the space between the nozzle 12 and the clamping flange 16 are filled with an elastic bush 18. The nozzle 12 is formed using a hard ceramic material such as high alumina as a raw material, and includes a substantially cylindrical nozzle body 20 and a lower skirt portion 22 as shown in FIG. The skirt portion 22 is tapered downward and has an annular raised portion 24 on the outer peripheral surface of the nozzle 12 near the boundary between the nozzle body 20 and the skirt portion 22.
Is provided. In the present embodiment, the raised portion 24 is an annular raised portion. However, the present invention is not limited to this. For example, a plurality of protrusions may be dispersedly provided on the outer peripheral surface of the nozzle body 20 as spots as the protrusions 24, or a plurality of annular protrusions may be formed.

The tightening flange 16 is made of metal, and as shown in FIG. 3, comprises a middle tube portion 28 made of a cylindrical pipe and a flange body 30 connected to the upper end of the middle tube portion 28. The flange main body 30 has an opening 31 having a diameter larger than the outer diameter of the nozzle main body 20, and bolt holes 34 for passing an embedded bolt 32 (see FIG. 1) are provided around the opening 31 at equal intervals. The middle cylinder part 28 is the flange body 3
A plurality of through-holes 26 are provided on the cylindrical wall of the cylindrical wall so as to be orthogonal to 0 and concentric with the opening 31. The support nozzle 14 is made of metal and includes the skirt portion 22.
2 is a cylindrical body having an inner diameter larger than the outer diameter of the tightening flange 16 and the inner diameter of the middle cylindrical portion 28, a bolt screw hole 36 for an embedded bolt 32 is provided at an upper part, and a lower part is pressurized by a pump. Is welded to a header pipe A for transporting the slurry. As shown in FIG. 1, the fastening flange 16 is connected to the support nozzle 14 via a packing 38 by a bolt connection between the embedded bolt 32 and a bolt screw hole 36.

The elastic bush 18 is formed between the nozzle 12 and the support nozzle 14 so that the outside and the inside of the middle cylinder 28 are integrally formed through the through hole 26 of the middle cylinder 28 of the fastening flange 16. Elastic resin is filled. Furthermore, the annular gap between the nozzle 12 and the flange body 30 of the clamping flange 16 is also filled with the extension 19 of the elastic bush 18. The elastic resin forming the elastic bush 18 is vulcanized butyl rubber as described later.

The manufacture of the support structure 10 is as shown in FIG.
Using a mold B having the same shape as the internal shape of the support nozzle 14, the nozzle 12 is arranged at the center of the mold B, and the nozzle 12 is concentrically penetrated through the middle cylindrical portion 28 of the tightening flange 16. Fastening flange 16 to nozzle 12 from above
Is extrapolated and set on the mold B. Next, butyl rubber is injected and filled between the nozzle 12 and the mold B, and then vulcanized and cured. When the mold B is removed, a combined molded product of the nozzle 12, the fastening flange 16, and the elastic bush 18 can be obtained.

Next, the combined molded product obtained as described above is assembled into the support nozzle 14, and the embedded bolt 32 is inserted through the bolt hole 34 of the tightening flange 16 as shown in FIG.
Into the bolt screw hole 36 of the support nozzle 14. By adjusting the degree of tightening of the embedding bolt 32, the degree of tightening of the elastic bush 18 can be adjusted. The elastic bush 18 serves to prevent direct contact between the nozzle 12 and the support nozzle 14 and the tightening flange 16, seal between the nozzle 12 and the support nozzle 14, and prevent leakage of slurry. Further, it can receive a reaction force at the time of slurry injection in cooperation with the raised portion 24 of the nozzle 12. In the above embodiment, the support structure of the slurry injection nozzle attached to the absorption tower of the flue gas desulfurization device used in power plants such as thermal power plants has been described, but the support structure of the ceramic nozzle used in other devices is described. The present invention can be applied.

[0016]

As described above, according to the present invention, the elastic resin is interposed between the ceramic nozzle and the tightening flange so that the nozzle does not come into direct contact with the tightening flange and the support nozzle. This prevents the ceramic nozzle from coming into contact with the fastening flange or the support nozzle, cracking and breaking. Further, since the elastic resin can absorb the impact applied to the nozzle during the slurry injection and can buffer the impact transmitted to the nozzle from the outside, the effect of completely protecting the nozzle from the impact force and preventing breakage can be obtained. Further, since the raised portion and the elastic resin provided on the outer peripheral surface of the nozzle body function as a stopper, the reaction force generated at the time of slurry injection and the weight of the nozzle can be sufficiently supported. The support structure for a ceramic nozzle according to the present invention can be suitably used, for example, in a spray type absorption tower of a flue gas desulfurization apparatus that injects limestone slurry.

[Brief description of the drawings]

FIG. 1 is a partial sectional side view showing one embodiment of a ceramic nozzle support structure according to the present invention.

FIG. 2 is a diagram showing a state in which a ceramic nozzle support structure according to the present invention is attached to a slurry header pipe.

FIG. 3 is a partial cross-sectional side view of a fastening flange according to an embodiment of the present invention.

FIG. 4 is a partial sectional side view of the nozzle body of the embodiment.

FIG. 5 is a view for explaining an example of a method for manufacturing a support structure for a ceramic nozzle.

[Explanation of symbols]

10: Example of support structure for ceramic nozzle according to the present invention, 12: nozzle, 14: support nozzle, 16: fastening flange, 18: elastic bush, 19: extension of elastic bush, 20: nozzle body, 22: Skirt, 2
4: raised portion, 26: through hole, 28: middle cylinder portion, 30: flange body, 31: flange opening, 32: embedded bolt, 34: bolt hole, 36: bolt screw hole, 38: packing

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kosuke Yamashita 4-8-4 Kanon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Inside Ryomei Giken Co., Ltd. (72) Inventor Junji Ozaki 2-6-1 Katsumama, Hofu City, Yamaguchi Prefecture No. Oji Rubber Chemical Co., Ltd. (72) Inventor Kaneshige 2-6-6 Katsuma, Hofu City, Yamaguchi Prefecture Oji Rubber Chemical Co., Ltd. (56) References JP-A-5-146889 (JP, A) Akira Mikai 60-95959 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05B 1/00-1/36 B01D 53/34 B01D 53/14-53/18

Claims (1)

(57) [Claims] 1. A ceramic nozzle having a raised portion on the outer peripheral surface of a nozzle body, a flange body having an opening larger than the outer shape of the nozzle body, and an inner diameter larger than the outer shape of the nozzle body. A middle flange portion extending substantially concentrically with the opening in a direction orthogonal to the flange body, and having a through-hole in the wall of the middle cylinder portion; A support nozzle connected to the tightening flange by a bolt connection with the flange body at the top of the cylindrical body, the tightening flange having an opening in the tightening flange; The nozzle is housed inside so as to penetrate the middle cylinder part, and the middle cylinder part of the fastening flange is arranged in the support nozzle together with the nozzle, and the fastening flange is An elastic resin is filled in the gap between the nozzle and the support nozzle so that the inside and the outside of the middle cylinder portion are integrated through the through hole, and the fastening flange and the support nozzle are further bolted together through the flange body. A support structure for a ceramic nozzle characterized by being a combined body.