JP3735174B2 - Axial fan for flue gas desulfurization equipment - Google Patents

Axial fan for flue gas desulfurization equipment Download PDF

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Publication number
JP3735174B2
JP3735174B2 JP03430597A JP3430597A JP3735174B2 JP 3735174 B2 JP3735174 B2 JP 3735174B2 JP 03430597 A JP03430597 A JP 03430597A JP 3430597 A JP3430597 A JP 3430597A JP 3735174 B2 JP3735174 B2 JP 3735174B2
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JP
Japan
Prior art keywords
impeller
inlet side
outlet side
flue gas
gas desulfurization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP03430597A
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Japanese (ja)
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JPH10220392A (en
Inventor
正憲 古閑
光男 三原
建三 瀬川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP03430597A priority Critical patent/JP3735174B2/en
Publication of JPH10220392A publication Critical patent/JPH10220392A/en
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Publication of JP3735174B2 publication Critical patent/JP3735174B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は排煙脱硫装置に好適な軸流フアンに関する。
【0002】
【従来の技術】
従来のこの種軸流フアンの1例が図2に示され、(A) は主要部の縦断面図、(B) は(A) のB部拡大図、(C) は(A) のC部拡大図である。
【0003】
図2(A) に示すように、翼車3の外周には複数の動翼6が周方向に等間隔を隔てて取り付けられ、これら動翼6は車室内筒1と車室外筒2との間に限界された円環状の気体流路9に突出している。
【0004】
この気体流路9には動翼6の気体入口側に入口側静翼4が、気体出口側に出口側静翼8が配置されて、それぞれ車室内筒1と車室外筒2との間に架設されている。
翼車3に取り付けられた主軸5は軸受7によって軸支され、これらは車室内筒1の内部に配設されている。
【0005】
翼車3の出口側端面3a及び入口側端面3bの外周縁は、図2(B) 、図2(C) に示すように、それぞれ車室内筒1の端面と微少隙間(3〜5mm) を隔てて対向することによってシール部を構成している。なお、10はシールフィンである。
【0006】
しかして、図示しない電動機により主軸5を介して翼車3を駆動すると、動翼6が気体流路9内で回転し、灰分を含有する排煙が気体流路9に吸込まれ、入口側静翼4、動翼6、出口側静翼8を経て吐出される。
【0007】
【発明が解決しようとする課題】
上記従来の軸流フアンにおいては、その運転中シール部にミスト状の灰が流れ込み、このミスト状の灰が蒸発、濃縮を繰り返すことによって、図2(C) に示すように、固化した灰12が車室内筒1の端面に付着して成長する。
【0008】
そして、翼車3の回転時、この灰12が翼車3に接触することによって翼車3に摩耗部11が発生し、摩耗部11のアンバランスにより翼車3の振動等を惹起する。
そこで、軸流フアンを分解して摩耗部11を肉盛補修し、その表面を機械仕上げした後、再組立する必要があるので、維持、管理の手間及びコストが嵩むという問題があった。
【0009】
【課題を解決するための手段】
本発明は上記課題を解決するために発明されたものであって、その要旨とするところは、(1)翼車の外周に間隔を隔てて取り付けられた複数の動翼が車室外筒と車室内筒との間に限界された円環状の気体流路に突出し、上記翼車の入口側及び出口側端面の外周縁とこれに微少隙間を隔てて対向する上記車室内筒の入口側及び出口側端面とによってシール部を形成してなる排煙脱硫装置用の軸流フアンにおいて、上記翼車の入口側及び出口側端面の外周縁に周方向に間隔を隔てて複数のスクレーパを突設し、上記車室内筒の入口側及び出口側端面に上記スクレーパに対向して、フッ素樹脂からなる円環状のライナーをねじによって取り付けたことを特徴とする排煙脱硫装置用の軸流ファンにある。
【0010】
他の特徴とするところは、上記手段(1)の排煙脱硫装置用の軸流ファンにおいて、(2)上記翼車の入口側及び出口側端面の外周縁に凹所が穿設され、同凹所内に上記スクレーパが設けられていて、上記スクレーパは上記翼車の入口側及び出口側端面より突出するエッジを具えていることにある。
【0011】
【発明の実施の形態】
本発明の第1の実施形態が図1に示され、(A) は軸流フアンの主要部の縦断面図、(B) は(A) のB部拡大図、(C) は(A) のC部拡大図、(D) は(C) のD−D矢に沿う矢視図である。
【0012】
図1(B)、(C)に明示するように、翼車3の出口側及び入口側端面3a、3bの外周縁には周方向に等間隔を隔てて複数のU字状の凹所21が穿設され、これら凹所21にステライト硬化肉盛を施工することによってスクレーパ20が形成されている。
このスクレーパ20は図1(D) に明示するように、断面が四角形で端面3a、3bより2mm程度突出するエッジを具えている。
【0013】
一方、車室内筒1の端面には耐腐食性及び揆水性に富むテフロン等からなる円環状のライナー22が皿小螺子23によって締結され、この、ライナー22はスクレーパ20と微少隙間(3〜5mm) を隔てて対向している。
他の構成、作用は図2に示す従来のものと同様であり、対応する部材には同じ符号を付してその説明を省略する。
【0014】
しかして、軸流フアンの運転時、排煙に含まれるミスト状の灰がシール部に流れ込むが、ライナー22の揆水作用によりライナー22への付着が抑制される。
そして、図1(C) に示すように、固化した灰12がライナー22及び車室内筒1に付着した場合であっても、この灰12は翼車3の回転に伴って回転する複数のスクレーパ20のエッジによって削り取られるので、従来のように成長することはなく、従って、固化した灰12が翼車3に接触してこれを摩耗させることはない。
【0015】
以上、本発明を単段型軸流フアンに適用した実施形態について説明したが、本発明は図3に示す2段型軸流フアンに適用しうることは勿論である。
【0016】
【発明の効果】
本発明においては、翼車の端面の外周縁に周方向に間隔を隔てて複数のスクレーパを突設したため、車室内筒の端面に付着して固化した灰をスクレーパによって削り取ることができる。
従って、固化した灰が翼車に接触してこれを摩耗させることがないので、翼車の振動を防止できるとともに摩耗部を補修するための手間及び経費を節減できる。
【0017】
車室内筒の端面にスクレーパに対向して円環状のライナーを取り付ければ、車室内筒の端面に灰が付着するのを抑制できる。
【図面の簡単な説明】
【図1】本発明の実施形態が示され、(A) は軸流フアンの主要部の縦断面図、(B) は(A) のB部拡大図、(C) は(A) のC部拡大図、(D) は(C) のD−D矢に沿う矢視図である。
【図2】従来の軸流フアンの1例が示され、(A) は主要部の縦断面図、(B) は(A) のB部拡大図、(C) は(A) のC部拡大図である。
【図3】従来の2段型軸流フアンを示す主要部の縦断面図である。
【符号の説明】
3 翼車
3a、3b 端面
6 動翼
4 入口側静翼
8 出口側静翼
2 車室外筒
1 車室内筒
9 気体流路
20 スクレーパ
22 ライナー
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an axial fan suitable for a flue gas desulfurization apparatus.
[0002]
[Prior art]
An example of this conventional axial fan is shown in FIG. 2, where (A) is a longitudinal sectional view of the main part, (B) is an enlarged view of part B of (A), and (C) is C of (A). FIG.
[0003]
As shown in FIG. 2A, a plurality of moving blades 6 are attached to the outer periphery of the impeller 3 at equal intervals in the circumferential direction, and these moving blades 6 are connected to the vehicle interior cylinder 1 and the vehicle interior outer cylinder 2. It protrudes into an annular gas passage 9 limited in between.
[0004]
In this gas flow path 9, an inlet-side stationary blade 4 is disposed on the gas inlet side of the moving blade 6, and an outlet-side stationary blade 8 is disposed on the gas outlet side, and each is disposed between the vehicle interior cylinder 1 and the vehicle interior outer cylinder 2. It is erected.
The main shaft 5 attached to the impeller 3 is pivotally supported by a bearing 7, and these are arranged inside the vehicle interior cylinder 1.
[0005]
As shown in FIGS. 2 (B) and 2 (C), the outer peripheral edges of the exit side end surface 3a and the inlet side end surface 3b of the impeller 3 are each provided with a small gap (3 to 5 mm) from the end surface of the vehicle interior cylinder 1. The seal portion is configured by facing each other at a distance. Reference numeral 10 denotes a seal fin.
[0006]
Thus, when the impeller 3 is driven through the main shaft 5 by an electric motor (not shown), the moving blade 6 rotates in the gas flow path 9 and the smoke containing ash is sucked into the gas flow path 9 so that the inlet side static It is discharged through the blade 4, the moving blade 6, and the outlet side stationary blade 8.
[0007]
[Problems to be solved by the invention]
In the above-described conventional axial fan, mist-like ash flows into the seal portion during operation, and this mist-like ash is repeatedly evaporated and concentrated, so that solidified ash 12 is obtained as shown in FIG. Adheres to the end surface of the vehicle interior cylinder 1 and grows.
[0008]
When the impeller 3 rotates, the ash 12 comes into contact with the impeller 3 to generate a wear portion 11 in the impeller 3, and the imbalance of the wear portion 11 causes vibration of the impeller 3.
Therefore, it is necessary to disassemble the axial flow fan to repair the worn portion 11 and build up the surface of the worn portion 11 and then reassemble it. Therefore, there is a problem in that maintenance and management labor and cost increase.
[0009]
[Means for Solving the Problems]
The present invention has been invented in order to solve the above-mentioned problems. The gist of the present invention is as follows: (1) A plurality of moving blades attached to the outer periphery of an impeller at intervals are provided with a casing outer cylinder and a vehicle Projecting into an annular gas passage limited between the inner cylinder and the outer peripheral edge of the inlet side and outlet side end faces of the impeller and facing the outer peripheral edge with a slight gap therebetween, the inlet side and outlet of the inner cylinder In an axial flow fan for a flue gas desulfurization apparatus, in which a seal portion is formed by a side end surface, a plurality of scrapers are projected from the outer peripheral edges of the inlet side and outlet side end surfaces of the impeller at circumferential intervals. An axial flow fan for a flue gas desulfurization apparatus , characterized in that an annular liner made of a fluororesin is attached to the inlet side and outlet side end faces of the vehicle interior cylinder with screws to face the scraper .
[0010]
Another feature is that in the axial fan for the flue gas desulfurization device of the above means (1), (2) a recess is formed in the outer peripheral edge of the inlet side and outlet side end surfaces of the impeller. The scraper is provided in the recess, and the scraper has edges protruding from the inlet side and outlet side end surfaces of the impeller .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention is shown in FIG. 1, wherein (A) is a longitudinal sectional view of the main part of an axial fan, (B) is an enlarged view of part B of (A), and (C) is (A). (D) is an arrow view along the DD arrow of (C).
[0012]
As clearly shown in FIGS. 1 (B) and 1 (C), a plurality of U-shaped recesses 21 are provided at equal intervals in the circumferential direction on the outer peripheral edges of the outlet side and inlet side end faces 3a, 3b of the impeller 3. The scraper 20 is formed by constructing a hardened stellite in these recesses 21.
As clearly shown in FIG. 1 (D), the scraper 20 has a square cross section and has an edge protruding about 2 mm from the end faces 3a and 3b.
[0013]
On the other hand, an annular liner 22 made of Teflon or the like having high corrosion resistance and water repellency is fastened to the end surface of the vehicle interior cylinder 1 by a countersunk screw 23. ) Facing each other.
Other configurations and operations are the same as those of the conventional one shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof is omitted.
[0014]
Thus, during operation of the axial fan, mist-like ash contained in the flue gas flows into the seal portion, but adhesion to the liner 22 is suppressed by the soaking action of the liner 22.
As shown in FIG. 1 (C), even when the solidified ash 12 adheres to the liner 22 and the vehicle interior cylinder 1, the ash 12 is rotated by a plurality of scrapers that rotate as the impeller 3 rotates. Since it is scraped off by the 20 edges, it does not grow as in the prior art, and therefore the solidified ash 12 does not contact and wear the impeller 3.
[0015]
Although the embodiment in which the present invention is applied to the single-stage axial fan has been described above, the present invention can of course be applied to the two-stage axial fan shown in FIG.
[0016]
【The invention's effect】
In the present invention, since the plurality of scrapers project from the outer peripheral edge of the end surface of the impeller at intervals in the circumferential direction, the ash that adheres to the end surface of the vehicle interior cylinder and is solidified can be scraped off by the scraper.
Therefore, since the solidified ash does not contact and wear the impeller, the vibration of the impeller can be prevented and labor and cost for repairing the worn portion can be reduced.
[0017]
If an annular liner is attached to the end surface of the vehicle interior cylinder so as to face the scraper, it is possible to suppress ash from adhering to the end surface of the vehicle interior cylinder.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, (A) is a longitudinal sectional view of a main part of an axial fan, (B) is an enlarged view of part B of (A), and (C) is C of (A). (D) is an arrow view along the DD arrow of (C).
FIG. 2 shows an example of a conventional axial fan, where (A) is a longitudinal sectional view of the main part, (B) is an enlarged view of part B of (A), and (C) is part C of (A). It is an enlarged view.
FIG. 3 is a longitudinal sectional view of a main part showing a conventional two-stage axial flow fan.
[Explanation of symbols]
3 Wings
3a, 3b End face 6 Rotor blade 4 Inlet side vane 8 Outlet side vane 2 Carcass outer cylinder 1 Carcass cylinder 9 Gas flow path
20 Scraper
22 liner

Claims (2)

翼車の外周に間隔を隔てて取り付けられた複数の動翼が車室外筒と車室内筒との間に限界された円環状の気体流路に突出し、上記翼車の入口側及び出口側端面の外周縁とこれに微少隙間を隔てて対向する上記車室内筒の入口側及び出口側端面とによってシール部を形成してなる排煙脱硫装置用の軸流フアンにおいて、上記翼車の入口側及び出口側端面の外周縁に周方向に間隔を隔てて複数のスクレーパを突設し、上記車室内筒の入口側及び出口側端面に上記スクレーパに対向して、フッ素樹脂からなる円環状のライナーをねじによって取り付けたことを特徴とする排煙脱硫装置用の軸流フアン。A plurality of moving blades attached to the outer periphery of the impeller at intervals are projected into an annular gas passage limited between the casing outer cylinder and the casing cylinder, and the inlet side and outlet side end faces of the impeller In the axial flow fan for a flue gas desulfurization device, in which a seal portion is formed by the outer peripheral edge of the casing and the inlet side and outlet side end faces of the vehicle interior cylinder facing this with a slight gap therebetween, the inlet side of the impeller And an annular liner made of a fluororesin projecting from the outer peripheral edge of the end surface on the outlet side at intervals in the circumferential direction and facing the scraper on the inlet side and outlet side end surfaces of the vehicle interior cylinder An axial flow fan for flue gas desulfurization equipment , characterized by being attached with screws . 上記翼車の入口側及び出口側端面の外周縁に凹所が穿設され、同凹所内に上記スクレーパが設けられていて、上記スクレーパは上記翼車の入口側及び出口側端面より突出するエッジを具えていることを特徴とする請求項1に記載の排煙脱硫装置用の軸流ファン。A recess is formed in the outer peripheral edge of the inlet side and outlet side end surfaces of the impeller, and the scraper is provided in the recess, and the scraper protrudes from the inlet side and outlet side end surfaces of the impeller The axial flow fan for a flue gas desulfurization device according to claim 1, comprising:
JP03430597A 1997-02-04 1997-02-04 Axial fan for flue gas desulfurization equipment Expired - Fee Related JP3735174B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03430597A JP3735174B2 (en) 1997-02-04 1997-02-04 Axial fan for flue gas desulfurization equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03430597A JP3735174B2 (en) 1997-02-04 1997-02-04 Axial fan for flue gas desulfurization equipment

Publications (2)

Publication Number Publication Date
JPH10220392A JPH10220392A (en) 1998-08-18
JP3735174B2 true JP3735174B2 (en) 2006-01-18

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* Cited by examiner, † Cited by third party
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CN112177951A (en) * 2020-10-12 2021-01-05 雷帅 Centrifugal ventilator for boiler

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