JPS6319400A - Tunnel ventilator - Google Patents
Tunnel ventilatorInfo
- Publication number
- JPS6319400A JPS6319400A JP16074586A JP16074586A JPS6319400A JP S6319400 A JPS6319400 A JP S6319400A JP 16074586 A JP16074586 A JP 16074586A JP 16074586 A JP16074586 A JP 16074586A JP S6319400 A JPS6319400 A JP S6319400A
- Authority
- JP
- Japan
- Prior art keywords
- tunnel
- air
- electrostatic precipitator
- removal device
- carbon monoxide
- 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.)
- Pending
Links
- 239000012717 electrostatic precipitator Substances 0.000 claims description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 15
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 15
- 238000009423 ventilation Methods 0.000 claims description 15
- 239000000428 dust Substances 0.000 description 16
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical class O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 9
- 229910002090 carbon oxide Inorganic materials 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000004071 soot Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000010718 Oxidation Activity Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Landscapes
- Ventilation (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
[産業上の利用分野1
本発明はトンネル換気装置において、トンネル内の汚染
空気を清浄にするトンネル換気装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a tunnel ventilation system that cleans contaminated air within a tunnel.
[従来の技術]
よく知られているように通路トンネルにおいては、自動
車の排気ガスから道路利用者および保守員を安全に守る
ことが必要である。換気の対象となるのは0人体に有害
な汚染物質である一酸化炭素および安全走行に障害とな
る煤煙である。[Prior Art] As is well known, in passage tunnels, it is necessary to safely protect road users and maintenance personnel from automobile exhaust gas. The targets of ventilation are carbon monoxide, which is a pollutant harmful to the human body, and soot and smoke, which impedes safe driving.
第4図に示すようにトンネルa内の自動車qなどの排気
ガスに含まれる汚染物質の換気方法としでは、集中給排
気口をもつ縮流換気方式が多く採用され2塁本的には輻
流給排気口す、排風機C1換気塔dから構成されている
。As shown in Figure 4, as a method of ventilation for pollutants contained in exhaust gas from automobiles q and other vehicles inside tunnel a, a condensed flow ventilation method with a central air supply and exhaust port is often used, and a convergence ventilation method is often used. It consists of an air supply/exhaust port, an exhaust fan C, and a ventilation tower d.
一般にトンネルa内の汚染空気の濃度弁イロは。In general, the concentration of contaminated air in tunnel A is:
輻流給排気口すの位置を境に両トンネル区間で直線的に
変化する。It changes linearly in both tunnel sections with the position of the radiant supply and exhaust port as the boundary.
トンネルa内の汚染空気の濃度分布は、CXをトンネル
内濃度2Mを汚染物質の単位長さ発生量(m3/sec
−m ) 、 Q、をトンネル内流量(m3/5e
c)、 Lを入口または出口からの距離(m)とすると
。The concentration distribution of polluted air in tunnel a is expressed as follows:
-m), Q, is the flow rate in the tunnel (m3/5e
c), Let L be the distance (m) from the entrance or exit.
C=MxL/Q。C=MxL/Q.
となる。becomes.
上記の式から明らかなようにトンネル内淵度CXは、
fvl、 Qr一定のもとでは距離L (LlまたはL
)だけの関数で表わされ、最高濃度CHAXとなる位
置は縮流給排気口すの地点となる。この関係を図示した
のか第4図であり、実線は煤・煙。As is clear from the above formula, the tunnel depth CX is
When fvl and Qr are constant, the distance L (Ll or L
), and the position where the highest concentration CHAX occurs is the point of the contracted air supply and exhaust port. This relationship is illustrated in Figure 4, where the solid line represents soot and smoke.
破線は一酸化炭素COの濃度変化である。The broken line is the change in the concentration of carbon monoxide CO.
日本の自動車トンネルでは、トンネル内汚染物貿の濃度
に関して許容1直が設定されている。ガス状物質の場合
−酪化炭素COが基準でその許容濃度は1100ppで
ある。In Japan's automobile tunnels, a permissible one-shift limit is set for the concentration of pollutants inside the tunnel. For gaseous substances - butyric carbon CO is the standard and its permissible concentration is 1100 pp.
一般に、集中給排気縮流換気の場合、トンネル内汚染物
買の許容濃度を満足させるためには、交通量およびトン
ネル長さ等の条件設定のうえ、最終的に給排気量が決定
される。その際、当然縦流拾排気口す位置での最高濃度
が許容値以下に収まるように配慮される。Generally, in the case of centralized air supply/exhaust condensation ventilation, in order to satisfy the permissible concentration of pollutants in the tunnel, the air supply/exhaust volume is finally determined after setting conditions such as traffic volume and tunnel length. At that time, care must be taken to ensure that the maximum concentration at the vertical flow pick-up/exhaust port is within the permissible value.
[発明が解決しようとする問題点] ところで、従来のトンネル換気装置におっては。[Problem to be solved by the invention] By the way, in the conventional tunnel ventilation system.
以下のごとき問題点があった。There were the following problems.
トンネル内の煤煙を除去するために電気集塵機をトンネ
ル内に所要の間隔で配置し、汚染物質でおる一酸化炭素
の除去は所要の間隔に設けた縮流給排気口よりトンネル
外部の空気との入替えを行なう方法が行なわれていたた
めに、縦流恰排気口を設けなければならず、また9、恰
排風機の大型化などで建設コストおよび運転コストが増
大するという問題があった。Electrostatic precipitators are placed at required intervals inside the tunnel to remove soot and smoke inside the tunnel, and carbon monoxide, which is a pollutant, is removed through condenser air supply and exhaust ports installed at required intervals to connect air with the air outside the tunnel. Since the replacement method was used, it was necessary to provide a vertical exhaust port, and there was also the problem that the construction cost and operating cost increased due to the increased size of the exhaust fan.
さらに、この縮流給排気口を設けるためにトンネル上の
自然環境の汚染等に対する対策も必要となるという問題
があった。Furthermore, in order to provide this condensed flow supply/exhaust port, it is necessary to take measures against contamination of the natural environment above the tunnel.
[発明の目的]
本発明はトンネル換気装置における問題点を解決すへり
01案されたものである。[Object of the Invention] The present invention has been proposed to solve problems in tunnel ventilation systems.
その目的はトンネル内の汚染空気を外部との空気の入替
えなしに汚染空気をトンネル内にて清浄とし、トンネル
上の自然環境を破壊したりする縮流給排気口をなくして
トンネル上の自然環境を破壊することのない縮流給排気
口を必要としない。The purpose is to clean the contaminated air inside the tunnel without exchanging air with the outside, and to eliminate the condensation air supply and exhaust ports that destroy the natural environment above the tunnel. Does not require a condenser supply/exhaust port that will not destroy the flow.
建BQコストおよび動力コストの安い、トンネル換気装
置を提供するものでおる。We provide a tunnel ventilation system with low construction and power costs.
[発明の概要]
上記目的を達成するために2本発明は電気集塵機と一酸
化炭素除去装置とを直列に結合しトンネル内の長さ方向
に所要間隔ごとに配置し、縮流給排気口を要けず、トン
ネル内の汚染空気をトンネル外に抜き取ることなく、清
浄な空気か得られものである。[Summary of the Invention] In order to achieve the above object, the present invention combines an electrostatic precipitator and a carbon monoxide removal device in series, arranges them at required intervals in the length direction of the tunnel, and connects condensed air supply and exhaust ports. Clean air can be obtained without the need to extract contaminated air from inside the tunnel to the outside of the tunnel.
[実施例コ
以下に本発明の好適一実施例を添付図面に基づき詳述す
る。[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
第1図は本発明の好適一実施例の全体配置図。FIG. 1 is an overall layout diagram of a preferred embodiment of the present invention.
第2図は第1図における詳細図を示す。FIG. 2 shows a detailed view of FIG.
第1図において、自動車2等の通行するトンネル]内の
所要の位置にこのトンネル1に通じる迂回路3を設け、
この迂回路3内に電気束1兜殿4と−M化炭素除去装置
5を直列に結合し82置じた迂回路3と、電気集塵機4
のみを89置した迂回路3とからなるトンネル1内の換
気装置を構成している。In FIG. 1, a detour 3 leading to the tunnel 1 is provided at a required position within the tunnel through which automobiles 2 and the like pass;
In this detour 3, an electric flux 1 and a carbon removal device 5 are connected in series 82, and an electrostatic precipitator 4 is installed.
The ventilation system in the tunnel 1 is composed of a detour 3 and a detour 3 in which 89 pipes are placed.
また、換気装置の詳細な構成は第2図に示す如り、トン
ネル1内より分岐した迂回路3の中に電気集塵機4およ
びその下流側に一酸化炭素除去装置5および送風機7が
接続ダクト8,9と接続されて据付(すられている。電
気集塵機4の本体の入口、出口側にそれぞれ開閉ダンパ
10a、10bを備え、電気集塵機4の本体6内部には
高圧電源装置11から給電を受ける帯電ユニット12お
よび集塵ユトット13か収納されている。Further, the detailed configuration of the ventilation system is as shown in FIG. 2. An electrostatic precipitator 4 is placed in a detour 3 branching from inside the tunnel 1, and a carbon monoxide removal device 5 and a blower 7 are connected to a connecting duct 8 downstream of the detour 3. . A charging unit 12 and a dust collection unit 13 are also housed.
また、この集塵ユニット13の下流側に集塵電極に向け
てダスト払い落し用の圧縮空気を噴射する複数のエアー
ブローノズル14が配設され、かつ、このエアーブロー
ノズル14にコンプレッサー15に結合した配管21a
、21bを接続するとともに、他方でtよ、電気集塵は
4の本体のクーラング6底部にダスト排出トレー16を
画成し。Further, a plurality of air blow nozzles 14 for injecting compressed air for dust removal toward the dust collecting electrodes are arranged downstream of the dust collecting unit 13, and a compressor 15 is coupled to the air blow nozzles 14. pipe 21a
, 21b, and on the other hand, the electrostatic precipitator 4 defines a dust discharge tray 16 at the bottom of the coolant 6 of the main body.
このダスト排出トレー16にパックフィルタあるいはサ
イクロン等のダスト分離回収器17を配管19aにて接
続し、このダスト分離回収器17は吸引ファン]8と頂
部に配管19bにて接続してある。A dust separation and recovery device 17 such as a pack filter or a cyclone is connected to the dust discharge tray 16 through a pipe 19a, and the dust separation and recovery device 17 is connected to the top of the suction fan 8 through a pipe 19b.
ざらに、電気集塵機4の出口側開閉ダンパ1Qbの下流
側にダクト8にて、−酸化炭素除去装置5に導かれてい
る。この−酸化炭素除去装置5は例えば、触媒を収納し
た反応器等て構成される。Roughly speaking, it is led to the -carbon oxide removal device 5 through a duct 8 on the downstream side of the outlet-side opening/closing damper 1Qb of the electrostatic precipitator 4. This carbon oxide removal device 5 is configured, for example, as a reactor containing a catalyst.
ざらに、この−酸化炭素除去装置5の下流にダ゛クト9
にて送風機7に接続されている。Roughly speaking, there is a duct 9 downstream of this carbon oxide removal device 5.
It is connected to the blower 7 at.
なお、電気集塵機4のみを迂回路3に設りたものの構成
は第3図に示す如く上記に述べた構成のものより一酸化
炭素除去装置5および接続用ダクト8を除いた構成とな
っている。In addition, the structure of the structure in which only the electrostatic precipitator 4 is installed in the detour path 3 is as shown in FIG. 3, except that the carbon monoxide removal device 5 and the connecting duct 8 are removed from the structure described above. .
以上のように電気集塵機4と一酸化炭素除去装置5の一
体構成されたものと電気集塵機4のみのものをトンネル
内の所定の位置に配設し、トンネル換気装置を構成する
。図中、20a、 2Qbはダンパ10a、10bの開
閉駆動部、22は配管21a、21bの間に設けたエア
ー供給弁、23は排出トレー16の出口側に設けた開閉
ダンパでおる。As described above, the electrostatic precipitator 4 and the carbon monoxide removal device 5 integrated together and the electrostatic precipitator 4 alone are disposed at predetermined positions in the tunnel to form a tunnel ventilation system. In the figure, 20a and 2Qb are opening/closing driving parts for the dampers 10a and 10b, 22 is an air supply valve provided between the pipes 21a and 21b, and 23 is an opening/closing damper provided on the outlet side of the discharge tray 16.
以下に本発明の作用について述べる。The effects of the present invention will be described below.
送風機7を運転するとトンネル人口1aから一定母の空
気がトンネル1内に前人され、迂回路3を通って汚染空
気Aか電気集塵機4に吸引される。When the blower 7 is operated, a constant amount of air from the tunnel population 1a is drawn into the tunnel 1, passes through the detour 3, and is sucked into the electrostatic precipitator 4 as contaminated air A.
この電気集塵機4の本体内を通過する過程において、汚
染空気A中に含まれる浮遊微粒子かダストとして集塵ユ
ニット13の集塵電傳上に捕集され。During the process of passing through the main body of the electrostatic precipitator 4, floating particles contained in the contaminated air A are collected as dust on the dust collecting electrode of the dust collecting unit 13.
ざらに、−酸化炭素除去装置5にて有害物質である一酸
化簡素C○か吸収され、その結果、清浄化された空気へ
−か送風機7を通って下流側に送り出される。Roughly, in the carbon oxide removal device 5, the harmful substance monoxide simple C◯ is absorbed, and as a result, the purified air is sent downstream through the blower 7.
汚染空気A中に含まれる浮遊微粒子がダストとして電気
集塵機4にて除去されるか人体に有害な汚染物質で必る
一醒化炭素COは除去されていないので2次に一酸化炭
素除去装置5にて一酸化炭素C○の除去が行なわれる。The suspended particulates contained in the contaminated air A are removed as dust by the electrostatic precipitator 4, or the carbon monoxide, which is a pollutant harmful to the human body, is not removed, so the secondary carbon monoxide removal device 5 is used. Carbon monoxide C○ is removed.
電気集塵機4を通過した汚染空気Aはダクト8を通り一
酸化炭素除去装置5に達する。−酸化炭素除去装置5内
には例えば、低温酸化活性を有する触媒が充填されてあ
り、送風機7によって移送される汚染空気Aがこの触媒
に接触しながら通過することにより、−酸化炭素C○は
酸化され二酸化炭素CO2になって。The contaminated air A that has passed through the electrostatic precipitator 4 passes through a duct 8 and reaches the carbon monoxide removal device 5 . - For example, the carbon oxide removal device 5 is filled with a catalyst having low-temperature oxidation activity, and as the contaminated air A transferred by the blower 7 passes through while contacting this catalyst, - carbon oxide C○ is removed. It is oxidized and becomes carbon dioxide CO2.
汚染空気Aの中の一酸化炭素COが除去される。Carbon monoxide CO in contaminated air A is removed.
以上の過程で汚染空気Aより、まず煤煙(ダスト)が除
去され、ざらに、−酸化炭素COが除去されて、清浄な
空気へ−が得られる。In the above process, soot (dust) is first removed from the contaminated air A, and then carbon oxide CO is removed, resulting in clean air.
このような作用を有する電気集塵機4と一酸化炭素除去
装置5とをトンネル1内の長さ方向に所要間隔ごとに配
置することにより、トンネル1内の汚染空気を外部に扱
き取らずに汚染空気Aを清浄にすることができる。なお
、第1図に示す煤煙(実線)および−酸化炭素Co(破
線)の濃度の変化の如く本発明によりトンネル1内の汚
染物質の許容値を超えることなくトンネル1内の空気を
清浄に保つことができる。By arranging the electrostatic precipitator 4 and the carbon monoxide removal device 5 having such functions at required intervals in the length direction of the tunnel 1, the contaminated air inside the tunnel 1 can be removed without being handled outside. A can be cleaned. In addition, as shown in the changes in the concentration of soot (solid line) and -carbon oxide Co (broken line) shown in Figure 1, the present invention maintains the air inside the tunnel 1 clean without exceeding the allowable value of pollutants inside the tunnel 1. be able to.
[発明の効果]
以上述べた如く2本発明のトンネル換気装置によれば、
下記の如く種々の優れた効果を発揮する。[Effects of the Invention] As described above, according to the tunnel ventilation system of the present invention,
It exhibits various excellent effects as described below.
(1)電気集塵機と一酸化炭素除去装置を直列に結合し
、トンネル内の長さ方向に所要間隔ごとに配置している
のでトンネル内の汚染空気を外部に抜き取らずに汚染空
気を清浄にすることができる。(1) An electrostatic precipitator and a carbon monoxide removal device are connected in series and placed at required intervals along the length of the tunnel, so the contaminated air inside the tunnel is purified without being extracted to the outside. be able to.
(2)汚染空気をトンネル外部と換気する必要かないの
で縮流給排気口が不要となる。(2) Since there is no need to ventilate contaminated air with the outside of the tunnel, there is no need for a contracted flow supply/exhaust port.
(3)縮流給排気口が不要となるのでトンネルの建設コ
ストの低減が可能となる。(3) Tunnel construction costs can be reduced because contracted air supply and exhaust ports are not required.
(4)給排気口用の送排風演が不要となるので建設コス
トおよび運転コストの低減が可能となる。(4) Since air supply/exhaust operation for the air supply/exhaust ports is not required, construction costs and operating costs can be reduced.
(5)縦流れ給排気口の建設か不要となるのでトンネル
上の自然環境の汚染を防止できるとともに、自然環境の
保痕対策費の低減か可能となる。(5) Since there is no need to construct a vertical flow supply/exhaust port, it is possible to prevent contamination of the natural environment above the tunnel and to reduce the cost of measures to preserve the natural environment.
第1図は不発明の好適一実施例の金体図、第2図および
第3図は第1図の実施例にあける要部詳細図、第4図(
ま従来例を示す図でおる。
図中、1・・・トンネル、1a・・・トンネル入口、1
b・・・トンネル出口、2・・・自動車、3・・・迂回
路、4・・・電気集塵機、5・・・−酪化炭素除去装置
、6・・・ケーシング、7・・−送風懇、8・・・ダク
ト、9・・・ダクト。
10a・・・ダンパ、10b・・・ダンパ、11・・・
高圧電源装置、12・・・帯電ユニット、13・・・集
塵ユニット、14・・・エアーブローノズル、15・・
・コンプレツナ−916・・・ダスト排出トレー、17
・・・ダスト分離回収器、18・・・吸引ファン、19
a・・・配管。
19b・・・配管、20a・・・ダンパ開閉駆動部、2
0b・・・ダンパ開閉駆動部、21a・・・配管、21
b・・・配管、22・・・エアー供給弁、23・・・開
閉ダンパ。
である。Fig. 1 is a metal body diagram of a preferred embodiment of the invention, Figs. 2 and 3 are detailed views of the main parts of the embodiment of Fig. 1, and Fig. 4 (
This is a diagram showing a conventional example. In the figure, 1... tunnel, 1a... tunnel entrance, 1
b...Tunnel exit, 2...Car, 3...Detour, 4...Electrostatic precipitator, 5...-Butyric carbon removal device, 6...Casing, 7...-Air blower , 8...Duct, 9...Duct. 10a...Damper, 10b...Damper, 11...
High voltage power supply device, 12... Charging unit, 13... Dust collection unit, 14... Air blow nozzle, 15...
・Completuna-916...Dust discharge tray, 17
...Dust separation and recovery device, 18...Suction fan, 19
a... Piping. 19b...Piping, 20a...Damper opening/closing drive unit, 2
0b... Damper opening/closing drive unit, 21a... Piping, 21
b...Piping, 22...Air supply valve, 23...Opening/closing damper. It is.
Claims (1)
ネル内の長さ方向に所要間隔ごとに配置したことを特徴
とするトンネル換気装置。A tunnel ventilation system characterized by an electrostatic precipitator and a carbon monoxide removal device connected in series and arranged at required intervals along the length of the tunnel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16074586A JPS6319400A (en) | 1986-07-10 | 1986-07-10 | Tunnel ventilator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16074586A JPS6319400A (en) | 1986-07-10 | 1986-07-10 | Tunnel ventilator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6319400A true JPS6319400A (en) | 1988-01-27 |
Family
ID=15721537
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16074586A Pending JPS6319400A (en) | 1986-07-10 | 1986-07-10 | Tunnel ventilator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6319400A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03233100A (en) * | 1989-08-24 | 1991-10-17 | Agency Of Ind Science & Technol | Ventilating device for motorway tunnel |
JPH06179399A (en) * | 1992-12-14 | 1994-06-28 | Tsushin Hoso Eisei Kiko | Controlling method for satellite |
KR100782878B1 (en) * | 2007-08-27 | 2007-12-06 | 주식회사 리트코 | High speed tunnel fan including electrostatic filter section shaped hexagonal pipe |
JP2009039639A (en) * | 2007-08-08 | 2009-02-26 | Panasonic Corp | Electric dust collection system |
-
1986
- 1986-07-10 JP JP16074586A patent/JPS6319400A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03233100A (en) * | 1989-08-24 | 1991-10-17 | Agency Of Ind Science & Technol | Ventilating device for motorway tunnel |
JPH06179399A (en) * | 1992-12-14 | 1994-06-28 | Tsushin Hoso Eisei Kiko | Controlling method for satellite |
JP2009039639A (en) * | 2007-08-08 | 2009-02-26 | Panasonic Corp | Electric dust collection system |
KR100782878B1 (en) * | 2007-08-27 | 2007-12-06 | 주식회사 리트코 | High speed tunnel fan including electrostatic filter section shaped hexagonal pipe |
WO2009028771A1 (en) * | 2007-08-27 | 2009-03-05 | Jong Seung Chung | High speed tunnel fan with electrostatic filter |
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