JP2002306929A - Method and device for cleaning engine exhaust gas - Google Patents

Method and device for cleaning engine exhaust gas

Info

Publication number
JP2002306929A
JP2002306929A JP2001116295A JP2001116295A JP2002306929A JP 2002306929 A JP2002306929 A JP 2002306929A JP 2001116295 A JP2001116295 A JP 2001116295A JP 2001116295 A JP2001116295 A JP 2001116295A JP 2002306929 A JP2002306929 A JP 2002306929A
Authority
JP
Japan
Prior art keywords
exhaust gas
urea
aqueous solution
ammonia
engine
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
JP2001116295A
Other languages
Japanese (ja)
Inventor
Ryokichi Yamada
良吉 山田
Shinichi Ichikawa
伸一 市川
Hisao Yamashita
寿生 山下
Tokunori Matsushima
徳紀 松島
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.)
Hitachi Engineering and Services Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Engineering and Services Co Ltd
Hitachi 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 Hitachi Engineering and Services Co Ltd, Hitachi Ltd filed Critical Hitachi Engineering and Services Co Ltd
Priority to JP2001116295A priority Critical patent/JP2002306929A/en
Publication of JP2002306929A publication Critical patent/JP2002306929A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Treating Waste Gases (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for cleaning engine exhaust gas, which device prevent fused solidification of urea when an aqueous solution of urea is supplied into the system, is little in heat consumption, reactively decomposes the aqueous solution of urea to ammonia, furthermore, decomposes the aqueous solution of urea to ammonia at a lower reaction temperature, is improved in the operation and is cost- reduced. SOLUTION: The device comprises a nozzle which is housed in a covering member is arranged on a position having approximately normal temperature, the aqueous solution of urea is supplied into the system and the fused solidification of the aqueous solution of urea is prevented. Further, the engine exhaust gas is introduced into an evaporation part and the aqueous solution of urea is heated up to a reaction temperature at which the aqueous solution can be decomposed to ammonia. Because the engine exhaust gas is made a heating source, this device for cleaning engine exhaust gas is permitted to be little in heat consumption and reactively decomposes the aqueous solution of urea with high efficiency. Furthermore, a catalyst for decomposing the aqueous solution of urea is arranged on the upper surface of the evaporation part, and as a result, the aqueous solution of urea is decomposed into ammonia at a further lower reaction temperature.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は排ガス等の浄化方法
及び装置に関し，詳しくは定置型ディーゼルエンジン等
の熱機関から排出される排ガス中に含有する窒素酸化物
の脱硝及びパテイキュレートの処理方法及び装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for purifying exhaust gas and the like, and more particularly, to a method for denitrification and particulate treatment of nitrogen oxides contained in exhaust gas discharged from a heat engine such as a stationary diesel engine and the like. Related to the device.

【０００２】[0002]

【従来の技術】ディーゼルエンジン等の内燃機関から排
出される、窒素酸化物や粒子状物質（パテイキュレー
ト）等の環境汚染物質の低減が社会問題として取り上げ
られる様になってきており、その低減は緊急の課題とな
っている。これに対しては、エンジン燃料の改善、燃料
改質、排気後処理等の対策技術の研究が進められてい
る。2. Description of the Related Art Reduction of environmental pollutants such as nitrogen oxides and particulate matter (particulates) emitted from an internal combustion engine such as a diesel engine has been taken up as a social problem. It is an urgent task. In response to this, research on countermeasures such as improvement of engine fuel, fuel reforming, exhaust after-treatment, and the like has been conducted.

【０００３】上記２物質のうち、窒素酸化物の低減及び
除去法に関しては還元剤として尿素、尿素水溶液、アン
モニア、アンモニア水溶液を用いて脱硝することが公知
である。また、還元剤の供給方法等に関しては、特開昭
６３−１９０６２３号公報、特開平１−４７４２７号公
報等に記載されている。一方、パテイキュレートの除去
に関しては金属繊維フィルター、ハニカム状フィルター
あるいはこれらのフィルターに燃焼触媒を担持してパテ
イキュレートを捕集して燃焼除去する方法がある。これ
らに関しては、窒素酸化物とパテイキュレートを個別に
処理する方法、さらには、窒素酸化物とパテイキュレー
トを同時に除去する方法が日経エコロジー/２０００年
８月号に記載されている。[0003] Of the above two substances, it is known to reduce and remove nitrogen oxides by using urea, an aqueous urea solution, ammonia and an aqueous ammonia solution as a reducing agent. The method of supplying the reducing agent is described in JP-A-63-190623 and JP-A-1-47427. On the other hand, regarding the removal of particulates, there is a method in which a combustion catalyst is supported on a metal fiber filter, a honeycomb filter or the like, and the particulates are collected and burned and removed. Regarding these, a method of separately treating nitrogen oxides and particulates, and a method of simultaneously removing nitrogen oxides and particulates are described in Nikkei Ecology / August 2000.

【０００４】[0004]

【発明が解決しようとする課題】排ガス中の窒素酸化物
の還元剤としては、コストが安価で、かつ、取扱いが容
易で安全性が高い、尿素及び尿素水溶液が多く用いられ
る。尿素水溶液をアンモニアに生成する反応は（１）に
よって表される。As a reducing agent for nitrogen oxides in exhaust gas, urea and an aqueous solution of urea, which are inexpensive, easy to handle and have high safety, are often used. The reaction for producing an aqueous urea solution into ammonia is represented by (1).

【０００５】 (NH2)2CO+H2O→２NH3+CO2．．．．．（１） （１）式の反応は触媒の存在下では約350℃以上、無触
媒下では500ないし550℃以上が反応分解温度とする必要
がある。このような高温状態は電気ヒータ加熱等の手段
によることが多く、熱消費量が大きくなる。この場合、
アルミナ材などの球状の粒子を充填し、これを電気ヒー
タ等の手段によて加熱し、ここに尿素水溶液を供給する
方法が採られる。また、上記加熱されたアルミナ充填層
内にスパイラル状の供給管を配置し、ここに尿素水溶液
を導入して徐々に加熱しながら反応分解温度迄持ってい
く方法が採られる。アルミナ粒子充填層に供給する方法
では、尿素水溶液がアルミナ粒子に析出する等の問題が
ある。これは、未反応物が増加し、上記（１）式の反応
が進行せず、アンモニア生成量が不足し、窒素酸化物の
脱硝反応率が低下する問題がある。また、スパイラル状
の供給管を通して供給する場合は、分解反応温度より低
い温度領域で尿素自体が溶融固化して閉塞し供給出来な
くなる問題が生じる。[0005] (NH2) 2CO + H2O → 2NH3 + CO2. . . . . (1) In the reaction of the formula (1), the reaction decomposition temperature must be about 350 ° C. or more in the presence of a catalyst, and 500 to 550 ° C. or more in the absence of a catalyst. Such a high temperature state is often caused by means such as electric heater heating, and the heat consumption increases. in this case,
A method of filling spherical particles such as an alumina material, heating the particles by means such as an electric heater, and supplying an aqueous urea solution thereto is employed. In addition, a method is employed in which a spiral supply pipe is disposed in the heated alumina packed bed, and a urea aqueous solution is introduced thereinto and gradually heated to a reaction decomposition temperature. The method of supplying the urea aqueous solution to the alumina particle packed bed has a problem that the aqueous urea solution precipitates on the alumina particles. This has a problem that the unreacted material increases, the reaction of the above formula (1) does not proceed, the amount of ammonia produced is insufficient, and the denitration reaction rate of nitrogen oxides is reduced. Further, in the case where the urea is supplied through a spiral supply pipe, urea itself is melted and solidified in a temperature range lower than the decomposition reaction temperature, and there is a problem that the supply cannot be performed.

【０００６】[0006]

【課題を解決するための手段】上記課題を解決するため
に，本発明は被覆部材内に収納したノズルから尿素水溶
液を供給するようにしたもので、ノズルの先端をほぼ常
温に近い位置に設置する。また、ノズル先端から供給さ
れる尿素水溶液が回りに飛散しない様に、被覆部材によ
って保護し、その先端も尿素水溶液が溶融固化しない温
度領域に配置する。また、エンジン排ガスの供給口と流
出する開口を有する蒸発部を前記ノズル被覆部材より後
流側に配置する。この蒸発部には、エンジン排ガスを導
入し、開口部から排出する間に蒸発部を加熱し、ここに
供給する尿素水溶液をアンモニアに分解可能な反応温度
に加熱する様にしたものである。In order to solve the above-mentioned problems, the present invention is to supply an aqueous urea solution from a nozzle housed in a covering member. The tip of the nozzle is installed at a position close to room temperature. I do. The urea aqueous solution supplied from the nozzle tip is protected by a covering member so as not to scatter around, and the tip is also arranged in a temperature region where the urea aqueous solution does not melt and solidify. In addition, an evaporating section having an engine exhaust gas supply port and an outflow opening is disposed downstream of the nozzle covering member. In this evaporator, the engine exhaust gas is introduced, the evaporator is heated while being discharged from the opening, and the urea aqueous solution supplied thereto is heated to a reaction temperature at which it can be decomposed into ammonia.

【０００７】[0007]

【発明の実施の形態】以下に，本発明の実施例について
説明する。Embodiments of the present invention will be described below.

【０００８】図１に本発明の一実施例に用いたエンジン
排ガスの浄化装置の構成を示す。図２には、図１に示し
たA矢指図、図３には蒸発部の詳細側面図を示す。ま
た、図４には図１に示した一実施例以外の他の実施例に
用いたエンジン排ガスの浄化装置の構成を示す。図５に
は図４の実施例の蒸発部の詳細側面図を示す。図１に示
す装置は，ノズル１、ノズル１を保護する被覆部材２、
尿素水溶液蒸発部３、排ガス供給口４、排ガス流出開口
部５、容器６、酸窒素酸化物除去部７、パテイキュレー
ト除去部８から構成されている。FIG. 1 shows the configuration of an engine exhaust gas purifying apparatus used in one embodiment of the present invention. FIG. 2 shows an arrow A direction shown in FIG. 1, and FIG. 3 shows a detailed side view of the evaporating section. FIG. 4 shows a configuration of an engine exhaust gas purifying apparatus used in another embodiment other than the embodiment shown in FIG. FIG. 5 shows a detailed side view of the evaporator of the embodiment of FIG. The apparatus shown in FIG. 1 includes a nozzle 1, a coating member 2 for protecting the nozzle 1,
It comprises a urea aqueous solution evaporating section 3, an exhaust gas supply port 4, an exhaust gas outflow opening 5, a vessel 6, an oxynitride oxide removing section 7, and a particulate removing section 8.

【０００９】図１、２及び３を用いて本実施例の動作に
ついて説明する。先ずエンジン排ガス２００を供給口４
から導入し、開口部５から後流側に向かって流出する。
この間に、蒸発部全体を所定の温度に加熱する。次い
で、尿素水溶液１００をノズル１から供給し、ノズル被
覆部材２内を経て蒸発部３上面に供給する。これによ
り、尿素水溶液１００を急激に蒸発分解反応させること
により、上記（１）式に示した生成物に分解する。分解
生成物110は、図３に示したように後流側に向かって流
れる間に、エンジン排ガス中の窒素酸化物と分解生成ア
ンモニアと接触し、窒素酸化物除去部７において下記
（２）式の還元反応が進行する。The operation of this embodiment will be described with reference to FIGS. First, supply engine exhaust gas 200 to supply port 4
And flows out from the opening 5 toward the downstream side.
During this time, the entire evaporator is heated to a predetermined temperature. Next, the urea aqueous solution 100 is supplied from the nozzle 1 and supplied to the upper surface of the evaporating section 3 through the inside of the nozzle covering member 2. As a result, the urea aqueous solution 100 is rapidly decomposed by evaporative decomposition to decompose into the product represented by the above formula (1). While the decomposition product 110 flows toward the downstream side as shown in FIG. 3, the decomposition product 110 comes into contact with the nitrogen oxide in the engine exhaust gas and the decomposition product ammonia, and the nitrogen oxide removing section 7 gives the following formula (2) The reduction reaction proceeds.

【００１０】NO+NH3+1/4O2→N2+3/2H2O.......(2) さらに、燃焼触媒を添着した金属繊維フィルターあるい
はハニカム状フィルター等を充填したパテイキュレート
除去部８において、パテイキュレートを捕集・燃焼して
除去できる。処理したエンジン排ガス３００を容器３か
ら系外に排出する。NO + NH3 + 1 / 4O2 → N2 + 3 / 2H2O (2) Further, in the particulate removal section 8 filled with a metal fiber filter or a honeycomb filter to which a combustion catalyst is attached. In addition, particulates can be removed by collecting and burning. The treated engine exhaust gas 300 is discharged from the container 3 to the outside of the system.

【００１１】本発明法の他の実施例を図４及び図５を用
いて説明する。図４において、機器は図１に示した構成
と同じであるが、異なるのは蒸発部３の上面に尿素水溶
液１００の分解触媒９を配置したことである。Another embodiment of the method of the present invention will be described with reference to FIGS. In FIG. 4, the equipment is the same as that shown in FIG. 1, except that the decomposition catalyst 9 for the urea aqueous solution 100 is disposed on the upper surface of the evaporator 3.

【００１２】異なる動作について説明する。尿素水溶液
１００をノズル１から蒸発部３上面に設けた分解触媒９
上に流下する。これにより、尿素水溶液１００を上記実
施例に比較して低温で蒸発・分解でき、前記（１）式の
反応が進行する。分解生成物は、図５に示したように後
流側に向かって流れる間に、エンジン排ガス中の窒素酸
化物と接触し脱硝除去層７において前記（２）式の反応
が進行し、脱硝できる。処理したエンジン排ガス３００
を容器３から系外に排出する。The different operation will be described. Decomposition catalyst 9 provided with urea aqueous solution 100 from nozzle 1 on top of evaporator 3
Run down. As a result, the urea aqueous solution 100 can be evaporated and decomposed at a lower temperature than in the above embodiment, and the reaction of the above formula (1) proceeds. While the decomposition product flows toward the downstream side as shown in FIG. 5, the decomposition product comes into contact with the nitrogen oxides in the engine exhaust gas, and the reaction of the above formula (2) proceeds in the denitration removal layer 7 to enable denitration. . Treated engine exhaust gas 300
From the container 3 to the outside of the system.

【００１３】上記尿素水溶液のアンモニア分解触媒とし
ては、公知であるチタニア系及びアルミナ系触媒が用い
られるが、これらに限定するものではない。As the ammonia decomposition catalyst for the urea aqueous solution, known titania-based and alumina-based catalysts are used, but are not limited thereto.

【００１４】[0014]

【発明の効果】本発明によれば、尿素水溶液を常温から
反応温度領域に滴下あるいは流下することができるの
で、尿素水溶液の溶融固化を防止でき、運用性の向上が
図れる効果がある。また、蒸発部を排ガス全量で加熱す
るため、電気ヒータ加熱に比べ、少ない熱消費量で尿素
水溶液を効率よくアンモニアに分解できる効果があり、
装置を小さくできると共にコスト低減が図れる。さら
に、蒸発部上面に尿素水溶液分解触媒を配置することに
より、より低い反応温度で尿素水溶液をアンモニアに分
解できる効果もあるAccording to the present invention, since the urea aqueous solution can be dropped or dropped from the room temperature to the reaction temperature range, the urea aqueous solution can be prevented from being melted and solidified, and the operability can be improved. In addition, since the evaporator is heated with the entire amount of exhaust gas, there is an effect that the urea aqueous solution can be efficiently decomposed into ammonia with a smaller amount of heat consumption as compared with electric heater heating.
The size of the apparatus can be reduced and the cost can be reduced. Furthermore, by disposing a urea aqueous solution decomposition catalyst on the upper surface of the evaporating section, there is an effect that the urea aqueous solution can be decomposed into ammonia at a lower reaction temperature.

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

【図１】本発明によるエンジンの排ガスの浄化装置の一
実施例の構成図。FIG. 1 is a configuration diagram of an embodiment of an apparatus for purifying exhaust gas of an engine according to the present invention.

【図２】図１のA矢指図方向（上面から）の視図。FIG. 2 is a view in a direction indicated by an arrow A in FIG. 1 (from above).

【図３】図１の蒸発部の詳細側面図。FIG. 3 is a detailed side view of the evaporator in FIG. 1;

【図４】図１に示した以外の実施例図。FIG. 4 is an embodiment view other than that shown in FIG. 1;

【図５】図４に示した蒸発部の詳細側面図。FIG. 5 is a detailed side view of the evaporator shown in FIG.

【符号の説明】[Explanation of symbols]

1…ノズル、2…被覆部材、3…尿素水溶液蒸発部、4…排
ガス供給口、5…排ガス流出開口部、6…容器、7…窒素
酸化物の除去部、8…パテイキュレート除去部９…分解
触媒、100…尿素水溶液、200…エンジン排ガス、300…
処理エンジン排ガス。1 ... Nozzle, 2 ... Coating member, 3 ... Urea aqueous solution evaporation section, 4 ... Exhaust gas supply port, 5 ... Exhaust gas outflow opening, 6 ... Container, 7 ... Removal section of nitrogen oxide, 8 ... Particle removal section 9 ... Decomposition catalyst, 100… Urea aqueous solution, 200… Engine exhaust gas, 300…
Processing engine exhaust gas.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０１Ｎ 3/24 Ｂ０１Ｄ 53/36 １０１Ａ 5/02 ＺＡＢ // Ｂ０１Ｄ 46/42 53/34 １２９Ｂ (72)発明者 市川 伸一 茨城県日立市大みか町七丁目２番１号 株 式会社日立製作所電力・電機開発研究所内 (72)発明者 山下 寿生 茨城県日立市大みか町七丁目２番１号 株 式会社日立製作所電力・電機開発研究所内 (72)発明者 松島 徳紀 茨城県日立市幸町三丁目２番２号 株式会 社日立エンジニアリングサービス内 Ｆターム(参考） 3G090 AA01 AA03 BA01 EA01 3G091 AA06 AA18 AB02 AB12 AB13 AB15 AB16 BA00 BA14 CA17 GA06 HA14 4D002 AA12 AC10 BA06 BA12 CA07 CA13 CA20 DA07 DA35 DA57 HA02 4D048 AA06 AB02 AC03 CC53 CC61 CD03 4D058 JA32 JB03 JB25 JB41 MA41 SA08 TA06 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F01N 3/24 B01D 53/36 101A 5/02 ZAB // B01D 46/42 53/34 129B (72) Invention Person Shinichi Ichikawa 7-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside Power and Electricity Research Laboratory, Hitachi, Ltd. Within the Electric Power and Electric Power Development Laboratory (72) Inventor Tokunori Matsushima 3-2-2 Sachimachi, Hitachi City, Ibaraki Prefecture F-term within Hitachi Engineering Services Co., Ltd. BA00 BA14 CA17 GA06 HA14 4D002 AA12 AC10 BA06 BA12 CA07 CA13 CA20 DA07 DA35 DA57 HA02 4D048 AA06 AB02 AC03 CC53 CC61 CD03 4D058 JA3 2 JB03 JB25 JB41 MA41 SA08 TA06

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 尿素水溶液、あるいは、尿素と水とを個
別に供給し、高温下でアンモニアに分解して、このアン
モニアによりディーゼルエンジンの排ガス中の窒素酸化
物を還元する方法において、 被覆部材内に収納されたノズルから尿素水溶液を供給
し、エンジン排ガスの供給口と流出する開口を有する蒸
発部に前記尿素水溶液を流下し、アンモニアに分解する
ことを特徴とするエンジン排ガスの浄化方法。1. A method for separately supplying an aqueous urea solution or urea and water, decomposing the urea into ammonia at a high temperature, and reducing the nitrogen oxides in the exhaust gas of the diesel engine with the ammonia. A method for purifying engine exhaust gas, comprising: supplying an aqueous urea solution from a nozzle housed in a urea tank; flowing the aqueous urea solution into an evaporating section having an engine exhaust gas supply port and an outlet; 【請求項２】 請求項１記載のエンジンの排ガスの浄化
方法において，前記排ガスの供給口と流出する開口を有
する蒸発部上面にアンモニア分解触媒を配置し、ここに
前記尿素水溶液を流下してアンモニアに分解することを
特徴とするエンジン排ガスの浄化方法。2. The method for purifying exhaust gas of an engine according to claim 1, wherein an ammonia decomposition catalyst is disposed on an upper surface of an evaporating section having a supply port and an outlet for the exhaust gas, and the urea aqueous solution is allowed to flow down to the ammonia decomposition catalyst. A method for purifying engine exhaust gas, comprising decomposing the exhaust gas. 【請求項３】 請求項１記載のエンジンの排ガスの浄化
方法において，前記蒸発部における尿素水溶液のアンモ
ニアへの分解反応温度の加熱を、前記エンジン排ガス熱
で行なうことを特徴とするエンジン排ガスの浄化方法。3. The method for purifying exhaust gas of an engine according to claim 1, wherein the temperature of the decomposition reaction of the aqueous urea solution into ammonia in the evaporator is heated by the heat of the engine exhaust gas. Method. 【請求項４】 請求項２記載の前記蒸発部に設置したア
ンモニア分解反応温度の触媒の加熱をエンジン排ガス熱
で行なうことを特徴とするエンジン排ガスの浄化方法。4. A method for purifying an engine exhaust gas according to claim 2, wherein the heating of the catalyst having an ammonia decomposition reaction temperature provided in the evaporating section is performed by the heat of the engine exhaust gas. 【請求項５】 請求項１記載のエンジンの排ガスの浄化
方法において，エンジン排ガス中の窒素酸化物を還元処
理したのち、パテイキュレートを除去することを特徴と
するエンジン排ガスの浄化方法。5. The method for purifying exhaust gas of an engine according to claim 1, wherein the particulate matter is removed after reducing nitrogen oxides in the engine exhaust gas. 【請求項６】 尿素水溶液、あるいは、尿素と水とを個
別に供給し、アンモニアに分解して該アンモニアにより
ディーゼルエンジンの排ガス中の窒素酸化物を還元し、
かつ、パテイキュレートを除去する装置において、 ノズルと該ノズルを被覆する部材を有する尿素水溶液供
給装置と、エンジンの排ガスの供給口と流出する開口部
とを有する尿素水溶液をアンモニアに分解する前記蒸発
装置と、前記エンジン排ガス中の窒素酸化物を還元する
装置と、パテイキュレート除去装置とから構成すること
を特徴とするエンジン排ガスの浄化装置。6. A urea aqueous solution or urea and water are separately supplied, decomposed into ammonia, and the ammonia reduces nitrogen oxides in exhaust gas of a diesel engine.
An apparatus for removing particulates, comprising: a urea aqueous solution supply device having a nozzle and a member covering the nozzle; and the evaporating device for decomposing an urea aqueous solution having an exhaust gas supply port of an engine and an opening for outflow into ammonia. And a device for reducing nitrogen oxides in the engine exhaust gas, and a particulate removal device.
JP2001116295A 2001-04-16 2001-04-16 Method and device for cleaning engine exhaust gas Pending JP2002306929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001116295A JP2002306929A (en) 2001-04-16 2001-04-16 Method and device for cleaning engine exhaust gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001116295A JP2002306929A (en) 2001-04-16 2001-04-16 Method and device for cleaning engine exhaust gas

Publications (1)

Publication Number Publication Date
JP2002306929A true JP2002306929A (en) 2002-10-22

Family

ID=18967050

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001116295A Pending JP2002306929A (en) 2001-04-16 2001-04-16 Method and device for cleaning engine exhaust gas

Country Status (1)

Country Link
JP (1) JP2002306929A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006014129A1 (en) 2004-08-06 2006-02-09 Scania Cv Ab (Publ) Arrangement for supplying a medium into an exhaust gas conduit in an internal combustion engine
WO2007010985A1 (en) * 2005-07-21 2007-01-25 Hino Motors, Ltd. Exhaust gas purifier
JP2007524783A (en) * 2003-04-07 2007-08-30 シー アメンドラ スティーヴン Urea-based composition and system therefor
US7481986B2 (en) 2005-06-04 2009-01-27 Haldor Topsoe A/S Method and system for injection of a solution into a gas stream

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007524783A (en) * 2003-04-07 2007-08-30 シー アメンドラ スティーヴン Urea-based composition and system therefor
JP2010248070A (en) * 2003-04-07 2010-11-04 Steven C Amendola Urea-based composition and system for the same
JP4653733B2 (en) * 2003-04-07 2011-03-16 シー アメンドラ スティーヴン Urea-based composition and system therefor
WO2006014129A1 (en) 2004-08-06 2006-02-09 Scania Cv Ab (Publ) Arrangement for supplying a medium into an exhaust gas conduit in an internal combustion engine
JP2008509328A (en) * 2004-08-06 2008-03-27 スカニア シーブイ アクチボラグ（パブル） Device for supplying a medium into an exhaust gas conduit of an internal combustion engine
US7481986B2 (en) 2005-06-04 2009-01-27 Haldor Topsoe A/S Method and system for injection of a solution into a gas stream
WO2007010985A1 (en) * 2005-07-21 2007-01-25 Hino Motors, Ltd. Exhaust gas purifier
JP2007023997A (en) * 2005-07-21 2007-02-01 Hino Motors Ltd Exhaust emission control device

Similar Documents

Publication Publication Date Title
CN101922329A (en) The apparatus and method of emissions filter are used to regenerate
KR101608720B1 (en) Exhaust gas purification system
TW200401746A (en) Selective non-catalytic reduction of NOx
WO1998022209A1 (en) SELECTIVE CATALYTIC NOx REDUCTION UTILIZING UREA WITHOUT CATALYST FOULING
JP2004270609A (en) Emission control device
JP2005113688A (en) Engine exhaust emission control device
CN112955243A (en) Integrated waste gas treatment device using metal filter
JP2007145796A (en) Urea water and denitrification apparatus using the same
KR101130732B1 (en) Container type exhaust gas purifying apparatus
JP2002540331A (en) Reactor for plasma assisted gas processing
JP2002306929A (en) Method and device for cleaning engine exhaust gas
JP2004313917A (en) Method and apparatus for waste gas denitrification using urea
CN108060961B (en) Reducing agent spray and exhaust flow guide and deflector
JP2005273509A (en) NOx REMOVAL EQUIPMENT AND NOx REMOVING METHOD
JP2010248955A (en) Exhaust emission control device
KR101900076B1 (en) Cleaning method of exhaust gas reduction device and cleaning device thereof
CN106150622B (en) Emission control system for vehicle
JP2003328734A (en) Exhaust pipe and exhaust gas denitration device preventing adhesion of urea
JP2001027112A (en) NOx REMOVAL SYSTEM
CN203891982U (en) SCR denitration system for tail gas of generator set
JPH0988558A (en) Nox removal system
JPH0515739A (en) Supply device and decomposing catalyst for reducing agent for denitration
JP3816661B2 (en) Automotive exhaust gas purification system
JP2007205308A (en) Exhaust emission control method and exhaust emission control system
JP3885272B2 (en) Denitration equipment