JPH07204466A - Bag filter - Google Patents

Bag filter

Info

Publication number
JPH07204466A
JPH07204466A JP6004500A JP450094A JPH07204466A JP H07204466 A JPH07204466 A JP H07204466A JP 6004500 A JP6004500 A JP 6004500A JP 450094 A JP450094 A JP 450094A JP H07204466 A JPH07204466 A JP H07204466A
Authority
JP
Japan
Prior art keywords
bag filter
catalyst
exhaust gas
main body
denitration
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
Application number
JP6004500A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Miura
千好 三浦
Katsuhiko Kobayashi
勝彦 小林
Kimitoshi Ose
公利 小瀬
Tatsuya Tomikawa
達也 富川
Hideaki Chikamatsu
秀昭 親松
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 JP6004500A priority Critical patent/JPH07204466A/en
Publication of JPH07204466A publication Critical patent/JPH07204466A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To enhance the retaining force of a catalyst of a bag filter while preventing the deterioration of catalytic function and prolong the life of filter cloth by preventing the lowering of the strength thereof. CONSTITUTION:A catalyst is supported on the inside of a bag filter main body 2 formed by weaving a chemical synthetic fiber into a felt form not only to enhance the retaining force of the catalyst but also to prevent the deterioration of catalytic function and the lowering of the strength of filter cloth is prevented by the felt like structure of the bag filter main body 2 and the surface filtering capacity of the bag filter main body 2 is enhanced while lowering the pressure loss value thereof.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、都市ごみ焼却炉、下水
汚泥焼却炉、産業廃棄物焼却炉、ボイラーディーゼルエ
ンジンなどの排ガス処理装置に適用され、各種の炉等か
ら発生する有害物質(煤塵、塩化水素、硫黄酸化物、窒
素酸化物、ダイオキシン、水銀等)を総合的に乾式方式
で同時除去処理することができるバグフィルターに関す
る。
BACKGROUND OF THE INVENTION The present invention is applied to an exhaust gas treatment apparatus such as an incinerator for municipal solid waste, an incinerator for sewage sludge, an incinerator for industrial waste, a boiler diesel engine, and the like, and harmful substances (soot dust) generated from various furnaces. , Hydrogen chloride, sulfur oxides, nitrogen oxides, dioxins, mercury, etc.) can be simultaneously processed by a dry method.

【0002】[0002]

【従来の技術】従来の脱硝用のガラス繊維バグフィルタ
ーは、φ3〜15μm程度のガラス繊維を400〜10
00g/m2 の打ち込み密度で、平織、綾織又は朱子織
に織り上げた布状のバグフィルター本体の両面に脱硝触
媒を担持させて、排ガス中の窒素酸化物をアンモニア還
元法によって除去するようにしている。
2. Description of the Related Art A conventional glass fiber bag filter for denitration has a glass fiber diameter of about 3 to 15 μm of 400 to 10
A Denitration catalyst was carried on both sides of a cloth-type bag filter body woven into a plain weave, a twill weave, or a satin weave with a shot density of 00 g / m 2 to remove nitrogen oxides in exhaust gas by an ammonia reduction method. There is.

【0003】即ち、図3に示すように、前記のようにガ
ラス繊維を織り上げたバグフィルター本体6の両面に触
媒層7を担持させ、アンモニアが添加された排ガス3を
バグフィルター本体6と触媒層7通過させて排ガス3中
の窒素酸化物(NOX )をアンモニアによって還元して
除去し、浄化された排ガス5として大気へ放出してい
る。また、排ガス3中の塩化水素(HCl)、硫黄酸化
物(SOx )等を除去するために、排ガス3中には塩化
水素、硫黄酸化物等を中和する消石灰がバグフィルター
の上流側で供給される。
That is, as shown in FIG. 3, a catalyst layer 7 is supported on both sides of the bag filter body 6 woven with glass fibers as described above, and the exhaust gas 3 containing ammonia is mixed with the bag filter body 6 and the catalyst layer. The nitrogen oxides (NO x ) in the exhaust gas 3 are reduced by ammonia and removed after passing through the exhaust gas 7, and the purified exhaust gas 5 is released to the atmosphere. Further, in order to remove hydrogen chloride (HCl), sulfur oxides (SO x ) and the like in the exhaust gas 3, slaked lime that neutralizes hydrogen chloride, sulfur oxides and the like in the exhaust gas 3 is provided on the upstream side of the bag filter. Supplied.

【0004】[0004]

【発明が解決しようとする課題】前記の従来のガラス繊
維バグフィルターにおいては、排ガス3の上流側の触媒
層7の上流側の表面上には、消石灰やダスト等の付着層
4が形成される。この付着層の払い落しのためにバグフ
ィルターの逆洗等が行われるが、使用期間が長くなって
逆洗等を繰り返して行うにつれてろ布の目開きが生じ、
ダスト除去率の低下、フィルターの強度低下を来すこと
になり、また、長期間の使用によって触媒の劣化等によ
る有害物質の除去機能が低下する。更に、触媒再生のた
めに、バグフィルターの水洗又は薬液洗浄及び触媒の再
生(再担持)が行われるが、これによってろ布の機械的
強度の低下が生ずる。従って、従来のガラス繊維バグフ
ィルターは、使用時間、触媒の再生回数に限度があり、
バグフィルターの更新による経済的負担が大きかった。
In the above-mentioned conventional glass fiber bag filter, an adhesion layer 4 of slaked lime or dust is formed on the upstream surface of the catalyst layer 7 upstream of the exhaust gas 3. . Backwashing of the bag filter is performed to remove the adhering layer, but as the use period becomes longer and backwashing is repeated, the filter cloth opens,
The dust removal rate is lowered, the strength of the filter is lowered, and the function of removing harmful substances due to deterioration of the catalyst due to long-term use is lowered. Furthermore, in order to regenerate the catalyst, washing of the bag filter with water or chemicals and regeneration (reloading) of the catalyst are performed, but this causes a decrease in mechanical strength of the filter cloth. Therefore, the conventional glass fiber bag filter has a limit in the usage time and the number of times the catalyst is regenerated,
The financial burden of updating the bug filter was large.

【0005】また前記の従来のガラス繊維バグフィルタ
ーでは、水洗、薬液洗浄、触媒の再生等によって、ガラ
ス繊維の表面処理剤のグラファイトコーティングがなく
なり、ガラス繊維の強度が低下するという問題もある。
Further, the above-mentioned conventional glass fiber bag filter has a problem that the strength of the glass fiber is lowered due to the disappearance of the graphite coating of the surface treatment agent for the glass fiber due to washing with water, washing with a chemical solution, regeneration of the catalyst and the like.

【0006】本発明は、以上の問題点を解決することが
できるバグフィルターを提供しようとするものである。
The present invention is intended to provide a bug filter capable of solving the above problems.

【0007】[0007]

【課題を解決するための手段】本発明のバグフィルター
は、化学合成繊維をフェルト状に織り上げたバグフィル
ター本体の内部に触媒を担持させたことを特徴とする。
A bag filter according to the present invention is characterized in that a catalyst is supported inside a bag filter main body made by weaving chemically synthetic fibers into a felt shape.

【0008】[0008]

【作用】本発明では、化学合成繊維をフェルト状に織り
上げたバグフィルター本体の内部の繊維間に触媒が担持
されているために、触媒の保持力が増加し、かつ、触媒
がバグフィルター本体内部に保持されているために、触
媒機能の低下が防止される。
In the present invention, since the catalyst is supported between the fibers inside the bag filter body made by weaving the chemically synthesized fibers into a felt shape, the catalyst holding power is increased and the catalyst is inside the bag filter body. Since it is held at, the deterioration of the catalytic function is prevented.

【0009】また、バグフィルター本体はフェルト状に
織り上げた化学合成繊維で構成されているために、水
洗、薬液洗浄によるクリーニング及び触媒の再生に当っ
て、従来のガラス繊維を布状に織り上げたバグフィルタ
ーにおけるように、ろ布の目開き等による強度低下を生
ずることがない。しかも、化学合成繊維をフェルト状に
織り上げてバグフィルター本体を構成しているために、
表面ろ過性能が良く、かつ、圧力損失値が低く、高流速
ろ過を行うことができる。
Further, since the bag filter body is made of felt-like chemical synthetic fibers, the conventional glass fibers are woven into a cloth bag for cleaning by washing with water, cleaning with a chemical solution and regeneration of the catalyst. Unlike the filter, the strength of the filter cloth does not decrease due to the opening of the filter cloth. Moreover, because the bag filter body is constructed by weaving chemically synthetic fibers into a felt shape,
The surface filtration performance is good, the pressure loss value is low, and high flow rate filtration can be performed.

【0010】[0010]

【実施例】本発明の一実施例を、図1及び図2によって
説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

【0011】図1は本発明の一実施例に係る脱硝バグフ
ィルターの模式図である。バグフィルター本体2は、太
さ2〜10μmの化学合成繊維を200〜600g/m
2 の打込み密度でフェルト状に織り上げて構成され、こ
のバグフィルター本体2を脱硝用触媒溶液中に完全浸漬
した上乾燥することによって、バグフィルター本体2内
部に脱硝触媒が担持されている。前記脱硝触媒は、1m
2 当り1gより少いと脱硝性能が不充分となり、また1
2 当り500gを超えると排ガスの圧損が増加するの
で、触媒担持量は1m2 当り1〜500gとされる。ま
た、バグフィルター本体2に用いられる化学合成繊維と
しては、ポリイミド系、ポリフェニレンサンファルド
系、ポリフルオロエチレン系、ポリエステル系等のもの
が用いられる。
FIG. 1 is a schematic view of a denitration bag filter according to an embodiment of the present invention. The bag filter main body 2 is made of chemically synthetic fiber having a thickness of 2 to 10 μm and is 200 to 600 g / m 2.
Configured weaving felted in 2 of implantation density, followed by drying over was completely immersed in the bag filter body 2 denitration catalyst solution in, denitration catalyst is supported within the bag filter body 2. The denitration catalyst is 1 m
If it is less than 1 g per 2 , denitration performance will be insufficient, and 1
Since the pressure loss of the exhaust gas is increased exceeding m 2 per 500 g, catalyst loading is a 1 m 2 per 1 to 500 g. Further, as the chemical synthetic fiber used for the bag filter main body 2, polyimide fiber, polyphenylene sanfaldo fiber, polyfluoroethylene fiber, polyester fiber or the like is used.

【0012】前記脱硫バグフィルターが用いられる燃焼
排ガス処理装置を、図2によって説明する。8は反応集
じん装置であり、同反応集じん装置8内に、図1に示す
ように、脱硝バグフィルターが装着される。
A combustion exhaust gas treatment apparatus using the desulfurization bag filter will be described with reference to FIG. Reference numeral 8 denotes a reaction dust collector, and a denitration bag filter is mounted in the reaction dust collector 8 as shown in FIG.

【0013】一方、燃焼炉より排出される温度120°
〜250℃の排ガス1には、消石灰供給装置9から消石
灰供給ブロワ10によって消石灰噴射供給装置11にお
いて消石灰が必要量供給され、この消石灰との中和反応
によって排ガス1中の塩化水素、硫黄酸化物等の一部が
除去される。
On the other hand, the temperature discharged from the combustion furnace is 120 °
The required amount of slaked lime is supplied from the slaked lime supply device 9 to the flue gas 1 at a temperature of up to 250 ° C. by the slaked lime supply blower 10 in the slaked lime injection supply device 11, and hydrogen chloride and sulfur oxides in the exhaust gas 1 are neutralized by this slaked lime. Etc. are partially removed.

【0014】次に前記の塩化水素、硫黄酸化物等の一部
が除去された排ガス1中に還元剤タンク13から窒素酸
化物の還元剤であるアンモニア及びアンモニア水を還元
剤噴射ポンプ14を介して還元剤噴射装置12において
必要量噴射供給し、供給された中和剤、還元剤を含む排
ガスはフィルター型反応集じん装置8に導入される。
Next, ammonia and ammonia water, which are reducing agents for nitrogen oxides, are introduced from the reducing agent tank 13 into the exhaust gas 1 from which a part of the above-mentioned hydrogen chloride, sulfur oxides, etc. has been removed, through a reducing agent injection pump 14. The reducing agent injection device 12 injects and supplies the necessary amount of exhaust gas, and the supplied exhaust gas containing the neutralizing agent and the reducing agent is introduced into the filter-type reactive dust collector 8.

【0015】反応集じん装置8においては、図1に示す
ように、前記の中和剤、還元剤を含む排ガス3が矢印に
示すように流れ、脱硝触媒を内部に担持したフェルト状
のバグフィルター本体2の上流側の表面上には、焼却炉
より排出されるバイジンと中和剤である消石灰で形成さ
れた付着層4が形成される。この付着層4を排ガス3が
通過する時に、排ガス3中に残っている塩化水素、硫黄
酸化物等は消石灰と反応して吸収除去され、バイジンも
同時に濾過効果によって除去される。このようにして付
着層4を通過した排ガス3は還元剤であるアンモニアと
一緒にバグフィルター本体2に導入され、排ガス3中の
窒素酸化物は脱硝触媒によってアンモニアに還元されて
除去され浄化された排ガス5として大気へ放出さる。
In the reaction dust collector 8, as shown in FIG. 1, the exhaust gas 3 containing the above-mentioned neutralizing agent and reducing agent flows as shown by an arrow, and a felt-like bag filter carrying a denitration catalyst therein. On the surface of the main body 2 on the upstream side, an adhesion layer 4 formed of benzine discharged from the incinerator and slaked lime as a neutralizing agent is formed. When the exhaust gas 3 passes through the adhesion layer 4, hydrogen chloride, sulfur oxides and the like remaining in the exhaust gas 3 react with the slaked lime to be absorbed and removed, and the virgin is also simultaneously removed by the filtering effect. The exhaust gas 3 that has passed through the adhesion layer 4 in this manner is introduced into the bag filter body 2 together with the reducing agent ammonia, and the nitrogen oxides in the exhaust gas 3 are reduced and removed by the denitration catalyst to be purified. It is released to the atmosphere as exhaust gas 5.

【0016】また、バグフィルター本体2上流側の表面
に付着した付着層4は、徐々に層厚さが増加していくた
め、厚くなり過ぎないように、時々、逆圧、逆洗、振動
等によって付着層4を払い落として反応集じん装置8下
部に設けた反応灰排出装置15によって排出する。
Further, the adhesion layer 4 adhered to the upstream surface of the bag filter main body 2 gradually increases in layer thickness, so back pressure, back washing, vibration, etc. are sometimes performed so as not to become too thick. The adhering layer 4 is wiped off by means of a reaction ash discharging device 15 provided below the reaction dust collecting device 8.

【0017】排ガス3中に含まれるダイオキシンは沸点
の高い物質であるため、反応集じん装置8の運転温度を
120〜250℃にすることよってダイオキシン類は微
粒子状となりバグフィルター本体2表面の付着層4によ
って除去され、ダイオキシン類の捕集効率が向上する。
また、排ガス3中に含まれる水銀も、反応集じん装置8
すなわちバグフィルター本体2の表面の付着層4によっ
て吸収及び吸着されて除去される。
Since the dioxin contained in the exhaust gas 3 is a substance having a high boiling point, the dioxin becomes fine particles when the operating temperature of the reaction dust collector 8 is set to 120 to 250 ° C., so that the adhesion layer on the surface of the bag filter body 2 becomes 4 improves the efficiency of collecting dioxins.
In addition, the mercury contained in the exhaust gas 3 also reacts with the reaction dust collector 8.
That is, it is absorbed and adsorbed by the adhesion layer 4 on the surface of the bag filter body 2 and removed.

【0018】前記のように、本実施例の脱硝バグフィル
ターでは、化学合成繊維をフェルト状に織り上げて構成
したバグフィルター本体2内部に脱硝触媒を担持してい
るために、触媒の保持力が増加し、かつ、バグフィルタ
ー本体2内に触媒を担持することによって触媒機能の低
下を防止することができる。また、バグフィルター本体
2は、フェルト状に織り上げた合成繊維で構成されてい
るために、表面ろ過性能が良く、かつ、圧力損失値が低
く、高流速ろ過を行うことが可能であると共に、水洗、
薬液洗浄によるクリーニング及び触媒の再成に当って、
従来のガラス繊維を布状に織り上げたバグフィルターに
おけるようにろ布の目開き等による強度低下を来すこと
もない。
As described above, in the denitration bag filter of this embodiment, since the denitration catalyst is carried inside the bag filter body 2 formed by weaving chemically synthesized fibers into a felt shape, the catalyst holding power is increased. In addition, by supporting the catalyst in the bag filter body 2, it is possible to prevent the deterioration of the catalytic function. Further, since the bag filter main body 2 is composed of synthetic fibers woven in a felt shape, it has good surface filtration performance, a low pressure loss value, and is capable of performing high flow rate filtration, and is also washed with water. ,
In cleaning by chemical cleaning and reforming the catalyst,
Unlike the conventional bag filter in which glass fibers are woven into cloth, the strength of the filter cloth does not decrease due to the opening of the filter cloth.

【0019】従って、本実施例のバグフィルターは、触
媒性能を長寿命化することができ、かつ、長期間再生し
て使用することができ、更新コストを大幅に低減するこ
とができる。
Therefore, the bag filter of this embodiment can have a long catalyst life, can be regenerated and used for a long period of time, and can significantly reduce the renewal cost.

【0020】また更に、本実施例のバグフィルターを、
図2に示す燃焼排ガス処理装置に用いることによって、
排ガス中に含まれるバイジン、塩化水素、硫黄酸化物、
窒素酸化物、ダイオキシン及び水銀等の有害物質を同時
に除去することができる。
Furthermore, the bag filter of this embodiment is
By using the flue gas treatment device shown in FIG.
Benzine, hydrogen chloride, sulfur oxides contained in exhaust gas,
It is possible to remove harmful substances such as nitrogen oxides, dioxins and mercury at the same time.

【0021】なお、前記実施例では、バグフィルター本
体内部に脱硝触媒を担持しているが、本発明において、
触媒の種類は脱硝触媒に限られるものではない。
In the above embodiment, the NOx removal catalyst is carried inside the bag filter body.
The type of catalyst is not limited to the denitration catalyst.

【0022】[0022]

【発明の効果】本発明は、化学合成繊維をフェルト状に
織り上げたバグフィルター本体の内部に担持することに
より、触媒性能を長寿命化し、水洗、薬液洗浄及び触媒
の再生に当ってのバクフィルター本体の強度低下を防ぐ
ことができ、同一バグフィルターを長期間使用して更新
コストを大幅に低減することができる。
INDUSTRIAL APPLICABILITY According to the present invention, by supporting chemically synthesized fibers inside the bag filter body woven in a felt shape, the catalyst performance is extended and the tap filter is used for washing with water, washing with a chemical solution and regeneration of the catalyst. It is possible to prevent the strength of the main body from deteriorating, and it is possible to greatly reduce the update cost by using the same bag filter for a long time.

【0023】また、フェルト状のバグフィルター本体を
採用しているために、表面ろ過性が良く、かつ、圧力損
失値が低く、高流速ろ過にも対応することができ、集じ
ん装置をコンパクトにすることができる。
Further, since the felt-like bag filter body is adopted, the surface filterability is good, the pressure loss value is low, and high flow rate filtration can be supported, and the dust collecting apparatus can be made compact. can do.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例に係る脱硝バグフィルターの
模式図である。
FIG. 1 is a schematic diagram of a denitration bag filter according to an embodiment of the present invention.

【図2】同実施例が用いられる燃焼排ガス処理装置の系
統図である。
FIG. 2 is a system diagram of a combustion exhaust gas treatment device in which the same embodiment is used.

【図3】従来のガラス繊維を用いた脱硝用のバグフィル
ターの模式図である。
FIG. 3 is a schematic view of a conventional bag filter for denitration using glass fiber.

【符号の説明】[Explanation of symbols]

1 排ガス 2 バグフィルター本体 3 排ガス 4 付着層 5 浄化された排ガス 8 反応集じん装置 9 消石灰供給装置 10 消石灰供給ブロワ 11 消石灰噴射供給装置 12 還元剤噴射装置 13 還元剤タンク 14 還元剤噴射ポンプ 1 Exhaust Gas 2 Bag Filter Main Body 3 Exhaust Gas 4 Adhesive Layer 5 Purified Exhaust Gas 8 Reactive Dust Collector 9 Slaked Lime Supply Device 10 Slaked Lime Supply Blower 11 Slaked Lime Injection Supply Device 12 Reducing Agent Tank 13 Reducing Agent Tank 14 Reducing Agent Injection Pump

───────────────────────────────────────────────────── フロントページの続き (72)発明者 富川 達也 横浜市中区錦町12番地 菱日エンジニアリ ング株式会社システム事業部内 (72)発明者 親松 秀昭 横浜市磯子区杉田4丁目4番25号 アイ・ シー・ティー株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuya Tomikawa 12 Nishiki-cho, Naka-ku, Yokohama City, Ryoh Engineering Co., Ltd. (72) Inventor Hideaki Oyamatsu 4-4-2, Sugita, Isogo-ku, Yokohama Ai・ Inside CT Corporation

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 化学合成繊維をフェルト状に織り上げた
バグフィルター本体の内部に触媒を担持させたことを特
徴とするバグフィルター。
1. A bag filter characterized in that a catalyst is supported inside a bag filter body made of chemically woven synthetic fiber in a felt shape.
JP6004500A 1994-01-20 1994-01-20 Bag filter Pending JPH07204466A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6004500A JPH07204466A (en) 1994-01-20 1994-01-20 Bag filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6004500A JPH07204466A (en) 1994-01-20 1994-01-20 Bag filter

Publications (1)

Publication Number Publication Date
JPH07204466A true JPH07204466A (en) 1995-08-08

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JP6004500A Pending JPH07204466A (en) 1994-01-20 1994-01-20 Bag filter

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Cited By (4)

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JP2013128883A (en) * 2011-12-21 2013-07-04 Babcock Hitachi Kk Device and method for treating exhaust gas
JP2014008460A (en) * 2012-06-29 2014-01-20 Mitsubishi Heavy Industries Environmental & Chemical Engineering Co Ltd Catalyst carrying bag filter
CN104874241A (en) * 2015-04-27 2015-09-02 华北电力大学 Gas purifying device and purifying method based on TiO2/MWNTs compound nano fiber felt
WO2020084925A1 (en) * 2018-10-24 2020-04-30 三菱重工エンジニアリング株式会社 Gas purification device, ship with same, and gas purification method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013128883A (en) * 2011-12-21 2013-07-04 Babcock Hitachi Kk Device and method for treating exhaust gas
JP2014008460A (en) * 2012-06-29 2014-01-20 Mitsubishi Heavy Industries Environmental & Chemical Engineering Co Ltd Catalyst carrying bag filter
CN104874241A (en) * 2015-04-27 2015-09-02 华北电力大学 Gas purifying device and purifying method based on TiO2/MWNTs compound nano fiber felt
WO2020084925A1 (en) * 2018-10-24 2020-04-30 三菱重工エンジニアリング株式会社 Gas purification device, ship with same, and gas purification method
JP2020065970A (en) * 2018-10-24 2020-04-30 三菱重工エンジニアリング株式会社 Gas cleaning device, craft comprising the same, and gas cleaning method
US11439942B2 (en) 2018-10-24 2022-09-13 Mitsubishi Heavy Industries Engineering, Ltd. Gas purification apparatus, ship including the same, and gas purification method

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