JP3140570B2 - Denitration equipment for internal combustion engines - Google Patents
Denitration equipment for internal combustion enginesInfo
- Publication number
- JP3140570B2 JP3140570B2 JP04218797A JP21879792A JP3140570B2 JP 3140570 B2 JP3140570 B2 JP 3140570B2 JP 04218797 A JP04218797 A JP 04218797A JP 21879792 A JP21879792 A JP 21879792A JP 3140570 B2 JP3140570 B2 JP 3140570B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- reducing agent
- catalyst layer
- internal combustion
- valve
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は往復動内燃機関、特に陸
舶用ディーゼルエンジンに適用される脱硝装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating internal combustion engine, and more particularly to a denitration apparatus applied to a land-based diesel engine.
【０００２】[0002]
【従来の技術】従来例では図２に示すように脱硝触媒層
４は排気過給機タービン１４の下流の排気管部１５に設
置されており、還元剤供給装置７も排気過給機タービン
１４の下流で脱硝触媒層４の上流に装着されている。2. Description of the Related Art In a conventional example, as shown in FIG. 2, a denitration catalyst layer 4 is installed in an exhaust pipe section 15 downstream of an exhaust supercharger turbine 14, and a reducing agent supply device 7 is also provided in the exhaust supercharger turbine 14. Is installed downstream of the denitration catalyst layer 4.
【０００３】[0003]
【発明が解決しようとする課題】ところが熱効率が高
く、新気吹き抜けが多い低速２サイクルディーゼルエン
ジンでは一般に排気が仕事をした上に、温度の低い新気
と混合してしまうので過給機下流の排気温度が低く、ア
ンモニア（ＮＨ3 ）あるいはアンモニア誘導体（例えば
尿素）を還元剤として使用する場合には、燃料中に硫黄
（Ｓ）分が含まれていると排ガス中のＳＯ2 が発生し排
ガス温度が低い場合には、酸性硫安を作り、触媒上に吸
着してしまい触媒性能が劣化すると言う問題点があっ
た。However, in a low-speed two-stroke diesel engine having high thermal efficiency and a large number of fresh air blow-throughs, the exhaust generally works and mixes with fresh air having a low temperature. When the exhaust gas temperature is low and ammonia (NH 3 ) or an ammonia derivative (for example, urea) is used as a reducing agent, if sulfur (S) is contained in the fuel, SO 2 in the exhaust gas is generated and the exhaust gas is exhausted. When the temperature is low, there is a problem that acidic ammonium sulfate is produced and adsorbed on the catalyst, thereby deteriorating the catalyst performance.
【０００４】本発明の目的は前記問題点を解消し、燃料
中に硫黄（Ｓ）分が多く含まれる場合にも酸性硫安を発
生して触媒機能を低下させることなく、排ガス中の窒素
酸化物（ＮＯx ）を還元剤により触媒上で還元できるよ
うにした内燃機関の脱硝装置を提供するにある。[0004] An object of the present invention is to solve the above-mentioned problems, and to produce acidic ammonium sulfate even when the fuel contains a large amount of sulfur (S), without deteriorating the catalytic function, and reducing the nitrogen oxides in the exhaust gas. It is an object of the present invention to provide a denitration apparatus for an internal combustion engine, which is capable of reducing (NO x ) on a catalyst with a reducing agent.
【０００５】[0005]
【課題を解決するための手段】本発明に係る内燃機関の
脱硝装置は、各シリンダの排気出口からの排ガスが合流
する排気マニホールド内の前記排気出口に対向する部位
に触媒層を設けるとともに、前記排気出口の該触媒層よ
りも上流側部位に排気出口毎に還元剤投入装置を設けた
ことを特徴としている。According to a denitration apparatus for an internal combustion engine according to the present invention, a catalyst layer is provided in a portion of the exhaust manifold where exhaust gases from the exhaust outlets of the respective cylinders are opposed to the exhaust outlet. A reducing agent introduction device is provided for each exhaust outlet at a position upstream of the catalyst layer at the exhaust outlet .
【０００６】[0006]
【作用】排気過給機の上流で排ガスの温度が十分に高い
部分、即ちシリンダカバーの各排気出口と排気過給機の
間のマニホールド３内の前記排気出口に対向する部位に
触媒層４を設け、かつ各シリンダカバーの各排気出口に
それぞれ還元剤投入弁７を設けているので、各シリンダ
から排出された高温の排ガスとそれと同期して投入され
た還元剤がよく混合して直ちに触媒層４を通過するよう
になり、触媒層の表面上で比較的高い温度を保持でき、
触媒表面に酸性硫安を生じさせるような不具合な反応を
さけることができ、触媒層が十分に機能してＮＯＸの排
出を十分に抑制することが可能となる。The catalyst layer 4 is provided in a portion where the temperature of the exhaust gas is sufficiently high upstream of the exhaust supercharger, that is, in a portion of the manifold 3 between each exhaust outlet of the cylinder cover and the exhaust supercharger, which faces the exhaust outlet. provided, and since the respective reducing agent dispenser valve 7 to the exhaust outlet of each cylinder cover is provided, the high temperature exhaust gas and its synchronized immediately catalyst layer charged reducing agent is mixed well discharged from the cylinder 4 comes to pass through, can maintain a relatively high temperature on the surface of the catalyst layer,
Can avoid trouble reactions that produce an acidic ammonium sulfate on the surface of the catalyst, it is possible to sufficiently suppress the emission of the NO X catalyst layer is fully functional.
【０００７】[0007]
【実施例】図１を参照し、本発明の一実施例について説
明する。図１は本発明を４シリンダの２サイクルエンジ
ンに適用した場合であり、１２はシリンダカバー、１は
排気弁、２は排気ポート、即ち排気出口、３０は各シリ
ンダからの排ガスが合流する排気マニホールド、９は掃
気タンク、８は排気管、４０は前記排気マニホールド３
０内に設けられた触媒層、７０は各シリンダカバー１２
の排気ポート２出口の触媒層４０の前に設けられた還元
剤投入弁、６は還元剤投入用のポンプ、５は還元剤用タ
ンク、５０は排気弁開弁センサ、６０は還元剤投入弁７
０の開弁コントローラ、１０は各シリンダの燃料噴射弁
を示している。１３は排気過給機ブロア、１４は排気過
給機タービンを示している。前記触媒層４０は、図１に
示すように、マニホールド２０内のシリンダカバー１２
の各排気ポート２に接続される排気出口に対向するよう
に設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Figure 1 is a case of applying the present invention to 4 two-cycle engine cylinder, 12 cylinder cover, 1 exhaust valve, the second exhaust ports, an exhaust outlet, 30 each Siri
Exhaust manifold gas from Sunda merge, the scavenging tank 9, 8 an exhaust pipe, 40 is the exhaust manifold 3
The catalyst layer 70 provided in the cylinder cover 12
, A reducing agent charging valve provided before the catalyst layer 40 at the outlet of the exhaust port 2, 6 a reducing agent charging pump, 5 a reducing agent tank, 50 an exhaust valve opening sensor, and 60 a reducing agent charging valve. 7
A valve opening controller of 0 indicates a fuel injection valve of each cylinder. Reference numeral 13 denotes an exhaust supercharger blower, and reference numeral 14 denotes an exhaust supercharger turbine. As shown in FIG. 1, the catalyst layer 40 covers the cylinder cover 12 inside the manifold 20.
Are provided so as to face the exhaust outlets connected to the respective exhaust ports 2.
【０００８】次に前記実施例の作用について説明する。
各シリンダの排気弁１が開弁すると開弁センサ５０がこ
れを検知して還元剤投入弁７０を開弁して適量のＮＨ3
等の還元剤を投入する。この時、排気弁１の開弁直後で
あるのと、排気弁１近くであって排気過給機タービン１
４の上流であるので、排ガスは比較的高温に保たれてお
り、その状態で還元剤と直接混合されて排気過給機ター
ビン１４と各シリンダカバー１２の排気ポート２出口と
の間の排気マニホールド３０内に各排気ポート２出口に
対向して設置された触媒層４０の表面に十分な温度を保
ったまま接触するため、硫黄（Ｓ）分の多い燃料を使用
した場合においても、酸性硫黄が発生して触媒層の性能
を劣化させ、脱硝機能を低下させることはない。Next, the operation of the above embodiment will be described.
When the exhaust valve 1 of each cylinder is opened, the valve-open sensor 50 detects this and opens the reducing agent charging valve 70 so that an appropriate amount of NH 3
And so on. At this time, immediately after the exhaust valve 1 is opened, and near the exhaust valve 1 and the exhaust supercharger turbine 1
4 , the exhaust gas is kept at a relatively high temperature, and is directly mixed with a reducing agent in that state, and the exhaust manifold between the exhaust supercharger turbine 14 and the exhaust port 2 outlet of each cylinder cover 12 is provided. At each outlet port 2 outlet within 30
For contacting while maintaining sufficient temperature to oppositely disposed surfaces of the catalyst layer 40, even In no event using sulfur (S) content-rich fuel, the catalyst layer acidic sulfur occurs performance And does not lower the denitration function.
【０００９】[0009]
【発明の効果】本発明に係る内燃機関の脱硝装置は、排
気過給機の前で、排ガスの温度が十分に高い部分、即ち
シリンダカバーの排気出口と排気過給機の間のマニホー
ルド内の前記排気出口に対向する部位に触媒層を設け、
且つ、シリンダカバーの排気出口に還元剤投入用弁を設
け、しかも排ガスが必ず触媒層を通過してから排気過給
機へ送られるようにしたので、各シリンダから排出され
た高温の排ガスとそれと同期して添加された還元剤が混
合されて比較的高温の状態で送られてくるので、触媒層
表面が低温になりにくく、酸性硫安などの生成の不具合
がなく触媒層により十分な酸化窒素の還元作用が得られ
る。The denitration apparatus for an internal combustion engine according to the present invention has a structure in which the temperature of exhaust gas is sufficiently high before the exhaust supercharger, that is, in the manifold between the exhaust outlet of the cylinder cover and the exhaust supercharger . A catalyst layer is provided at a portion facing the exhaust outlet ,
In addition, a reducing agent introduction valve is provided at the exhaust outlet of the cylinder cover, and since the exhaust gas is always sent to the exhaust supercharger after passing through the catalyst layer, the high-temperature exhaust gas discharged from each cylinder and Since the added reducing agent is mixed and sent at a relatively high temperature, the surface of the catalyst layer is unlikely to become low in temperature, and there is no problem of generation of acidic ammonium sulfate and the like. A reducing action is obtained.
【図１】本発明の第１実施例に係る４シリンダ２サイク
ルエンジンの適用例の図。FIG. 1 is a diagram of an application example of a four-cylinder two-stroke engine according to a first embodiment of the present invention.
【図２】従来例の図１応当図。FIG. 2 is a diagram corresponding to FIG. 1 of a conventional example.
１…排気弁、２…排気ポート、７…還元剤投入弁、８…
排気管、９…掃気タンク、１０…燃料噴射弁、１１…掃
気室、１２…シリンダカバー、４０…触媒層、７０…還
元剤投入弁、６…還元剤投入ポンプ、５…還元剤用タン
ク、５０…排気弁開弁センサ、６０…還元剤投入弁の開
弁コントローラ、３０…排気マニホールド、１３…排気
過給機ブロア、１４…排気過給機タービン。1 ... exhaust valve, 2 ... exhaust port, 7 ... reducing agent injection valve, 8 ...
Exhaust pipe, 9 scavenging tank, 10 fuel injection valve, 11 scavenging chamber, 12 cylinder cover , 40 catalyst layer, 70 reducing agent introduction valve, 6 reducing agent introduction pump, 5 tank for reducing agent, Reference numeral 50 denotes an exhaust valve opening sensor, 60 denotes a valve opening controller of a reducing agent injection valve, 30 denotes an exhaust manifold, 13 denotes an exhaust supercharger blower, and 14 denotes an exhaust supercharger turbine.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−63908（ＪＰ，Ａ) 特開 昭53−137326（ＪＰ，Ａ) 特開 平５−39715（ＪＰ，Ａ) 特開 平３−130522（ＪＰ，Ａ) 特開 昭61−34321（ＪＰ，Ａ) 実開 昭63−130613（ＪＰ，Ｕ) 実開 平４−103218（ＪＰ，Ｕ) 実開 昭62−726（ＪＰ，Ｕ) 欧州特許出願公開468919（ＥＰ，Ａ １) (58)調査した分野(Int.Cl.7，ＤＢ名) F01N 3/08 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-63908 (JP, A) JP-A-53-137326 (JP, A) JP-A-5-39715 (JP, A) JP-A-3-39 130522 (JP, A) JP-A-61-34321 (JP, A) JP-A-63-130613 (JP, U) JP-A-4-103218 (JP, U) JP-A-62-726 (JP, U) European Patent Application Publication 468919 (EP, A1) (58) Fields investigated (Int. Cl. 7 , DB name) F01N 3/08
Claims (1)
流する排気マニホールド内の前記排気出口に対向する部
位に触媒層を設けるとともに、前記排気出口の該触媒層
よりも上流側部位に排気出口毎に還元剤投入装置を設け
たことを特徴とする内燃機関の脱硝装置。1. A catalyst layer is provided in a portion of an exhaust manifold where exhaust gas from an exhaust outlet of each cylinder merges with the exhaust outlet, and each exhaust outlet is provided in a portion of the exhaust outlet upstream of the catalyst layer. A denitration apparatus for an internal combustion engine , further comprising a reducing agent introduction device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04218797A JP3140570B2 (en) | 1992-07-27 | 1992-07-27 | Denitration equipment for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04218797A JP3140570B2 (en) | 1992-07-27 | 1992-07-27 | Denitration equipment for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0650133A JPH0650133A (en) | 1994-02-22 |
| JP3140570B2 true JP3140570B2 (en) | 2001-03-05 |
Family
ID=16725520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04218797A Expired - Fee Related JP3140570B2 (en) | 1992-07-27 | 1992-07-27 | Denitration equipment for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3140570B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120132411A (en) * | 2011-05-26 | 2012-12-05 | 베르트질레 슈바이츠 악티엔게젤샤프트 | Apparatus and method for exhaust gas aftertreatment |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2796102B1 (en) * | 1999-07-07 | 2002-08-16 | Renault | PROCESS AND DEVICE FOR PURGING SULFUR OXIDES FROM A CATALYTIC EXHAUST TREATMENT POT OF AN INTERNAL COMBUSTION ENGINE |
| DE10053904C2 (en) * | 2000-10-31 | 2003-05-22 | Emitec Emissionstechnologie | Small volume NO¶x¶ adsorber |
| JP5781290B2 (en) * | 2010-11-02 | 2015-09-16 | 日立造船株式会社 | Exhaust gas purification device |
| WO2013035199A1 (en) * | 2011-09-09 | 2013-03-14 | 日立造船株式会社 | Exhaust gas purifying apparatus |
| CN114151178A (en) * | 2021-12-07 | 2022-03-08 | 中船动力(集团)有限公司 | Reducing agent injection and control method for marine SCR system |
-
1992
- 1992-07-27 JP JP04218797A patent/JP3140570B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120132411A (en) * | 2011-05-26 | 2012-12-05 | 베르트질레 슈바이츠 악티엔게젤샤프트 | Apparatus and method for exhaust gas aftertreatment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0650133A (en) | 1994-02-22 |
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