JPH06343820A - Treatment of waste gas by steam plasma - Google Patents
Treatment of waste gas by steam plasmaInfo
- Publication number
- JPH06343820A JPH06343820A JP5138085A JP13808593A JPH06343820A JP H06343820 A JPH06343820 A JP H06343820A JP 5138085 A JP5138085 A JP 5138085A JP 13808593 A JP13808593 A JP 13808593A JP H06343820 A JPH06343820 A JP H06343820A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- plasma
- waste gas
- steam
- exhaust gas
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/20—Non-catalytic reduction devices
- F23J2219/201—Reducing species generators, e.g. plasma, corona
Landscapes
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、ボイラ、加熱炉、焼
却炉等の燃焼排ガス中に含まれるNOx、SOx、C
O、あるいはダイオキシンなどの有害有機化合物を酸化
除去する方法に関し、より詳細には水蒸気プラズマによ
る排ガス処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to NOx, SOx, C contained in combustion exhaust gas from boilers, heating furnaces, incinerators, etc.
The present invention relates to a method for oxidizing and removing toxic organic compounds such as O or dioxin, and more particularly to a method for treating exhaust gas by steam plasma.
【0002】[0002]
【従来の技術】排ガス中の窒素酸化物(NOx)、硫黄
酸化物(SOx)、一酸化炭素(CO)、微量有機化合
物などを同時に酸化処理する方法としては、図3に示す
方法が提案されている。すなわち、この方法は、ガス流
路に設けられた反応ゾーン(21)において、電子加速器(2
2)で発生した電子ビームを排ガスに照射し、排ガス中に
活性な化学種、OH、O、H、HO2 などを生成し、こ
れらの活性な化学種によって排ガス中のNOx、SO
x、CO、有機化合物などを同時に酸化した後、排ガス
にアンモニアを加え、NOx、SOxの酸化生成物をア
ンモニウム塩として固体で回収擦るというものである。
なお、図3中、(23)は遮蔽壁、(24)は集塵器、(25)は吸
引ブロワである。2. Description of the Related Art A method shown in FIG. 3 has been proposed as a method for simultaneously oxidizing nitrogen oxides (NOx), sulfur oxides (SOx), carbon monoxide (CO), and trace organic compounds in exhaust gas. ing. That is, in this method, in the reaction zone (21) provided in the gas flow path, the electron accelerator (2
The electron beam generated in 2) is applied to the exhaust gas to generate active chemical species, such as OH, O, H, and HO 2 , in the exhaust gas, and NOx and SO in the exhaust gas are generated by these active chemical species.
After simultaneously oxidizing x, CO, an organic compound, etc., ammonia is added to the exhaust gas, and the oxidation products of NOx and SOx are recovered and rubbed as solid ammonium salts.
In FIG. 3, (23) is a shield wall, (24) is a dust collector, and (25) is a suction blower.
【0003】[0003]
【発明が解決しようとする課題】上述の従来法では、排
ガスに電子ビームを照射するために高価で大型の装置で
ある電子線加速器を設ける必要があり、またこれを囲っ
て電子線の飛散を防止する遮蔽壁を設ける必要があっ
て、設備費が高くつき、加えて、電離放射線取扱上の厳
しい制約があり、取扱上の面からの難点もある。そのた
め、この方法は未だ実用化されるに至っていない。In the above-mentioned conventional method, it is necessary to provide an electron beam accelerator, which is an expensive and large-sized device, for irradiating the exhaust gas with the electron beam, and the electron beam is scattered around the electron beam accelerator. Since it is necessary to provide a shielding wall to prevent it, the equipment cost is high, and in addition, there are severe restrictions on the handling of ionizing radiation, and there are difficulties in terms of handling. Therefore, this method has not yet been put to practical use.
【0004】この発明の目的は、上記の欠点を克服する
ために電子線照射装置を使用せずに効率的にOH、O、
H、HO2 などの活性な化学種を生成させ、これを用い
て排ガスを処理する方法を提供することにある。The object of the present invention is to efficiently use OH, O, and O without using an electron beam irradiation device in order to overcome the above-mentioned drawbacks.
An object of the present invention is to provide a method for treating exhaust gas by generating active chemical species such as H and HO 2 and using the chemical species.
【0005】[0005]
【課題を解決するための手段】この発明による排ガス処
理方法は、上記目的を達成すべく工夫されたものであっ
て、水蒸気単体あるいは水蒸気と希釈ガスとの混合ガス
をプラズマの作動ガスとしてプラズマ発生装置に供給
し、発生した水蒸気プラズマガスを排ガス中に供給し、
排ガス中の有害成分をプラズマによって酸化し無害化す
ることを特徴とするものである。The exhaust gas treatment method according to the present invention is devised to achieve the above-mentioned object, and plasma generation is performed by using water vapor alone or a mixed gas of water vapor and diluent gas as a working gas of plasma. Supply to the device, supply the generated steam plasma gas into the exhaust gas,
It is characterized by oxidizing harmful components in exhaust gas by plasma to render them harmless.
【0006】上記方法において、好ましくは、排ガスに
アンモニアまたは尿素を供給し、排ガス中のNOxおよ
び/またはSOxの酸化生成物をアンモニウム塩として
固体化する。[0006] In the above method, preferably, ammonia or urea is supplied to the exhaust gas to solidify the oxidation product of NOx and / or SOx in the exhaust gas as an ammonium salt.
【0007】希釈ガスとしては、空気、窒素、酸素、炭
酸ガス、アルゴンのうちの1種または数種の混合ガスが
好ましく使用される。As the diluting gas, one or a mixed gas of air, nitrogen, oxygen, carbon dioxide and argon is preferably used.
【0008】[0008]
【作用】水蒸気単体あるいは水蒸気と希釈ガスとの混合
ガスをプラズマ発生装置に供給し、[Operation] Supplying a single water vapor or a mixed gas of water vapor and a diluent gas to the plasma generator,
【化1】 なる反応で水蒸気および酸素のプラズマ化により活性な
化学種、O、OH、H、HO2 、O3 などを発生させ
る。[Chemical 1] In the reaction described above, active chemical species such as O, OH, H, HO 2 and O 3 are generated by converting water vapor and oxygen into plasma.
【0009】これらの活性な化学種、O、OH、H、H
O2 、O3 は、排ガス中のNOxおよびSO2 と下記式
の如く反応し、対応する酸化物を生成する。These active species, O, OH, H, H
O 2 and O 3 react with NOx and SO 2 in the exhaust gas as shown by the following formula to produce the corresponding oxide.
【0010】[0010]
【化2】 排ガスにアンモニアを供給する場合には、上記反応で生
じた硫酸および硝酸は下記式の如くアンモニアと反応
し、[Chemical 2] When supplying ammonia to the exhaust gas, the sulfuric acid and nitric acid generated in the above reaction react with ammonia as shown in the following formula,
【化3】 対応するアンモニウム塩として固体化される。この固体
は後流の集塵器で排ガスから除去される。[Chemical 3] Solidified as the corresponding ammonium salt. This solid is removed from the exhaust gas in a downstream dust collector.
【0011】また、排ガス中のCOや有機化合物は、活
性な化学種、O、OH、H、HO2、などと下記式の如
く反応し、CO and organic compounds in the exhaust gas react with active chemical species such as O, OH, H and HO 2 as shown in the following formula,
【化4】 無害化される。[Chemical 4] Detoxified.
【0012】[0012]
【実施例】この発明による排ガス処理方法を実施例によ
り具体的に説明する。EXAMPLES The exhaust gas treatment method according to the present invention will be specifically described with reference to Examples.
【0013】図1において、ガス流路に設けられた反応
ゾーン(1) の上側部にプラズマ発生装置(2) を設置す
る。プラズマ発生装置(2) は、図2に示すように、正極
(3) と負極(4) を備え、負極(4) に直流高圧電源(5) が
接続された構造を有する。In FIG. 1, a plasma generator (2) is installed above the reaction zone (1) provided in the gas flow path. As shown in FIG. 2, the plasma generator (2) has a positive electrode.
It has a structure in which (3) and a negative electrode (4) are provided, and a high voltage DC power supply (5) is connected to the negative electrode (4).
【0014】プラズマ発生装置(2) に水蒸気単体あるい
は水蒸気と希釈ガスとの混合ガスをプラズマの作動ガス
として供給する。希釈ガスとしては、空気、窒素、酸
素、炭酸ガス、アルゴンのうちの1種または数種の混合
ガスを使用し、プラズマ発生装置(2) に供給する。A simple substance of water vapor or a mixed gas of water vapor and a diluent gas is supplied to the plasma generator (2) as a working gas for plasma. As the diluting gas, one or a mixed gas of air, nitrogen, oxygen, carbon dioxide, and argon is used and is supplied to the plasma generator (2).
【0015】上記式[I]あるいは[II]によって発生
した水蒸気プラズマガスを反応ゾーン(1) において排ガ
スに供給し、排ガス中の有害成分をプラズマによって酸
化する(上記式 [III]および[V]参照)。The steam plasma gas generated by the above formula [I] or [II] is supplied to the exhaust gas in the reaction zone (1) to oxidize harmful components in the exhaust gas by plasma (the above formulas [III] and [V]). reference).
【0016】また、反応ゾーン(1) にアンモニアガスを
注入し、上記反応 [III]で生じた硫酸および硝酸を式
[IV]の反応により対応するアンモニウム塩として固体
化される。この固体は後流の集塵器(6) で排ガスから除
去される。Further, ammonia gas is injected into the reaction zone (1), and the sulfuric acid and nitric acid generated in the above reaction [III] are solidified as the corresponding ammonium salt by the reaction of the formula [IV]. This solid is removed from the exhaust gas by a dust collector (6) in the downstream.
【0017】なお、図1中、(7) は吸引ブロワ、(8) は
煙突である。In FIG. 1, (7) is a suction blower and (8) is a chimney.
【0018】[0018]
【発明の効果】この発明の排ガス処理方法では、水蒸気
単体あるいは水蒸気と希釈ガスとの混合ガスをプラズマ
化するので、従来は電子線照射でしか得られなかった活
性な化学種、O、OH、H、HO2 、O3 などを容易に
得ることができ、電子線照射法の最大の問題であった電
子線加速器の設置および電離放射線取扱上の制約といっ
た問題をすべて解決することができる。こうしてこの発
明の方法により、同時多目的排ガス処理が可能である。In the method for treating exhaust gas of the present invention, the water vapor alone or the mixed gas of the water vapor and the diluting gas is made into plasma. Therefore, the active chemical species, O, OH, and It is possible to easily obtain H, HO 2 , O 3 and the like, and it is possible to solve all the problems that are the greatest problems of the electron beam irradiation method, such as the installation of an electron beam accelerator and the restrictions on handling ionizing radiation. Thus, the method of the present invention enables simultaneous multipurpose exhaust gas treatment.
【図1】この発明による排ガス処理方法を示すフローシ
ートである。FIG. 1 is a flow sheet showing an exhaust gas treatment method according to the present invention.
【図2】プラズマ発生装置を示す断面図である。FIG. 2 is a cross-sectional view showing a plasma generator.
【図3】従来法を示すフローシートである。FIG. 3 is a flow sheet showing a conventional method.
1:反応ゾーン 2:プラズマ発生装置 3:正極 4:負極 5:直流高圧電源 1: Reaction zone 2: Plasma generator 3: Positive electrode 4: Negative electrode 5: DC high voltage power supply
Claims (2)
の混合ガスをプラズマの作動ガスとしてプラズマ発生装
置に供給し、発生した水蒸気プラズマガスを排ガス中に
供給し、排ガス中の有害成分をプラズマによって酸化し
無害化することを特徴とする、水蒸気プラズマによる排
ガス処理方法。1. A single gas of steam or a mixed gas of steam and a diluent gas is supplied to a plasma generator as a plasma working gas, the generated steam plasma gas is supplied to exhaust gas, and harmful components in the exhaust gas are oxidized by plasma. An exhaust gas treatment method using steam plasma, which is characterized by being rendered harmless.
アンモニアまたは尿素を供給し、排ガス中のNOxおよ
び/またはSOxの酸化生成物をアンモニウム塩として
固体化する方法。2. The method according to claim 1, wherein ammonia or urea is supplied to the exhaust gas to solidify an oxidation product of NOx and / or SOx in the exhaust gas as an ammonium salt.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5138085A JPH06343820A (en) | 1993-06-10 | 1993-06-10 | Treatment of waste gas by steam plasma |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5138085A JPH06343820A (en) | 1993-06-10 | 1993-06-10 | Treatment of waste gas by steam plasma |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06343820A true JPH06343820A (en) | 1994-12-20 |
Family
ID=15213608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5138085A Withdrawn JPH06343820A (en) | 1993-06-10 | 1993-06-10 | Treatment of waste gas by steam plasma |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06343820A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR19990047800A (en) * | 1997-12-05 | 1999-07-05 | 이해규 | Dioxin Reduction Device for Exhaust Gas |
US6479023B1 (en) | 1999-08-14 | 2002-11-12 | Johnson Matthey Public Limited Company | System for converting particulate matter in gasoline engine exhaust gases |
JP2004098035A (en) * | 2002-09-13 | 2004-04-02 | Japan Atom Energy Res Inst | Method for decomposing dioxins in flue gas/exhaust gas by electron beam irradiation |
EP1662104A1 (en) | 2004-11-29 | 2006-05-31 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus and method for controlling it |
KR100764793B1 (en) * | 2006-04-24 | 2007-10-11 | 엘지전자 주식회사 | Steamplasma generating module |
US7481043B2 (en) | 2003-12-18 | 2009-01-27 | Toyota Jidosha Kabushiki Kaisha | Plasma injector, exhaust gas purifying system and method for injecting reducing agent |
WO2011147085A1 (en) * | 2010-05-26 | 2011-12-01 | Ecospec Global Technology Pte Ltd. | Methods and system for removing gas components from flue gas |
US8343422B2 (en) | 2008-08-08 | 2013-01-01 | Chokichi Sato | Water vapor plasma generating apparatus, sterilization and disinfection method, and method for antioxidative treatment using water vapor plasma |
CN106730975A (en) * | 2017-02-03 | 2017-05-31 | 盐城工学院 | A kind of VOC emission-control equipments and VOC exhaust treatment systems |
CN111495158A (en) * | 2020-05-29 | 2020-08-07 | 广东佳德环保科技有限公司 | System and method for desulfurization and denitrification by cooperation of electron beam and oxidant |
-
1993
- 1993-06-10 JP JP5138085A patent/JPH06343820A/en not_active Withdrawn
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR19990047800A (en) * | 1997-12-05 | 1999-07-05 | 이해규 | Dioxin Reduction Device for Exhaust Gas |
US6479023B1 (en) | 1999-08-14 | 2002-11-12 | Johnson Matthey Public Limited Company | System for converting particulate matter in gasoline engine exhaust gases |
JP2004098035A (en) * | 2002-09-13 | 2004-04-02 | Japan Atom Energy Res Inst | Method for decomposing dioxins in flue gas/exhaust gas by electron beam irradiation |
US7481043B2 (en) | 2003-12-18 | 2009-01-27 | Toyota Jidosha Kabushiki Kaisha | Plasma injector, exhaust gas purifying system and method for injecting reducing agent |
EP1662104A1 (en) | 2004-11-29 | 2006-05-31 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus and method for controlling it |
US7475533B2 (en) | 2004-11-29 | 2009-01-13 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus and method for controlling it |
KR100764793B1 (en) * | 2006-04-24 | 2007-10-11 | 엘지전자 주식회사 | Steamplasma generating module |
US8343422B2 (en) | 2008-08-08 | 2013-01-01 | Chokichi Sato | Water vapor plasma generating apparatus, sterilization and disinfection method, and method for antioxidative treatment using water vapor plasma |
WO2011147085A1 (en) * | 2010-05-26 | 2011-12-01 | Ecospec Global Technology Pte Ltd. | Methods and system for removing gas components from flue gas |
US8529855B2 (en) | 2010-05-26 | 2013-09-10 | Ecospec Global Technology Pte Ltd. | Methods and system for removing gas components from flue gas |
KR101441221B1 (en) * | 2010-05-26 | 2014-09-17 | 에코스펙 글로벌 테크놀로지 피티이 엘티디 | Methods and System for Removing Gas Components from Flue Gas |
CN106730975A (en) * | 2017-02-03 | 2017-05-31 | 盐城工学院 | A kind of VOC emission-control equipments and VOC exhaust treatment systems |
CN111495158A (en) * | 2020-05-29 | 2020-08-07 | 广东佳德环保科技有限公司 | System and method for desulfurization and denitrification by cooperation of electron beam and oxidant |
CN111495158B (en) * | 2020-05-29 | 2024-02-27 | 广东佳德环保科技有限公司 | System and method for desulfurizing and denitrating by electron beam cooperated with oxidant |
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