JP2000146465A - Method for preventing adhesion of foreign object in exhaust gas recirculation burning system - Google Patents
Method for preventing adhesion of foreign object in exhaust gas recirculation burning systemInfo
- Publication number
- JP2000146465A JP2000146465A JP10332678A JP33267898A JP2000146465A JP 2000146465 A JP2000146465 A JP 2000146465A JP 10332678 A JP10332678 A JP 10332678A JP 33267898 A JP33267898 A JP 33267898A JP 2000146465 A JP2000146465 A JP 2000146465A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- oxidation catalyst
- engine
- egr
- piping
- 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- Withdrawn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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車あるいは産
業用のエンジンにおいて燃焼ガス（排気ガス）の一部を
回収し吸気に混合して燃焼することによりエンジンの排
気ガス中のＮＯｘを低減するシステムとして知られてい
る排気ガス再循環燃焼システムにおける異物付着防止方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for reducing NOx in engine exhaust gas by recovering a part of combustion gas (exhaust gas) in an automobile or industrial engine, mixing it with intake air and burning it. The present invention relates to a method for preventing foreign matter from adhering in an exhaust gas recirculation combustion system known as a gas exhaust system.
【０００２】[0002]
【従来の技術】排気ガスの一部を排気系から取出して、
再びエンジンの吸気系に戻し、混合気に加える方法は、
ＥＧＲ（Ｅｘｈａｕｓｔ Ｇａｓ Ｒｅｃｉｒｃｕｌａ
ｔｉｏｎ：排気再循環）と称される。ＥＧＲはＮＯｘ
（窒素酸化物）の発生抑制、ポンプ損失の低減、燃焼ガ
スの温度低下に伴う冷却液への放熱損失の低減、作動ガ
ス量・組成の変化による比熱比の増大と、これに伴うサ
イクル効率の向上など、多くの効果が得られることか
ら、エンジンの熱効率を改善するには有効な方法とされ
ている。2. Description of the Related Art A part of exhaust gas is taken out of an exhaust system,
To return to the intake system of the engine and add it to the mixture,
EGR (Exhaust Gas Recircula)
Tion: exhaust gas recirculation). EGR is NOx
(Nitrogen oxides) generation, pump loss reduction, heat radiation loss to the cooling fluid due to lowering of combustion gas temperature, increase in specific heat ratio due to changes in working gas amount and composition, and reduction in cycle efficiency Since many effects such as improvement can be obtained, it is considered to be an effective method for improving the thermal efficiency of the engine.
【０００３】しかるに、排気ガスの温度が高くなりかつ
排気ガス量が増大すると、その熱作用により排気ガスバ
ルブの耐久性が劣化し、早期破損を招く場合があった
り、その防止のために水冷構造とする必要があることや
吸気温度の上昇に伴い充填効率の低下により燃費の低下
などが認識されている。このような事態を避けるため、
エンジンの冷却液などによって排気ガスを冷却する装置
が用いられている。この装置としては、一般に多管式の
熱交換器が利用される。この熱交換器はＥＧＲクーラと
称している。However, when the temperature of the exhaust gas increases and the amount of the exhaust gas increases, the heat action deteriorates the durability of the exhaust gas valve and may cause early damage. It is recognized that the fuel efficiency needs to be reduced due to the need to perform the charging and a decrease in the charging efficiency with an increase in the intake air temperature. To avoid this,
2. Description of the Related Art A device that cools exhaust gas with a coolant of an engine or the like is used. As this device, a multi-tube heat exchanger is generally used. This heat exchanger is called an EGR cooler.
【０００４】図５は本発明の対象とする排気ガス再循環
燃焼システム（説明の便宜上「ＥＧＲ冷却システム」と
称する）を例示したもので、１はエンジン、２は吸気
系、３は排気系、４はマフラー、５は排気ガス回収配管
路、６はＥＧＲクーラである。すなわち、このＥＧＲ冷
却システムはエンジン１からの燃焼済み排気ガスの一部
を該排気系３に分岐接続した排気ガス回収配管路５にて
回収し、ＥＧＲクーラ６により所定の温度に冷却した
後、再びエンジン１の吸気系２に戻し、新燃焼用気体と
混合してエンジン１に供給する方式である。FIG. 5 illustrates an exhaust gas recirculation combustion system (referred to as an “EGR cooling system” for convenience of explanation), which is an object of the present invention. 1 is an engine, 2 is an intake system, 3 is an exhaust system, 4 is a muffler, 5 is an exhaust gas recovery pipe line, and 6 is an EGR cooler. That is, the EGR cooling system collects a part of the burned exhaust gas from the engine 1 in an exhaust gas recovery pipe line 5 branched and connected to the exhaust system 3, cools the exhaust gas to a predetermined temperature by an EGR cooler 6, This is a system in which the air is returned to the intake system 2 of the engine 1 again, mixed with the new combustion gas, and supplied to the engine 1.
【０００５】このＥＧＲ冷却システムに使用されるＥＧ
Ｒクーラとしては、図６にその一例を示すごとく、両端
部に冷却媒体流入口１１−１および冷却媒体流出口１１
−２を設けた胴管１１内部において、伝熱管群１２の両
端部が板金製のチューブシート１３にろう付けにより固
定され、一方、チューブシート１３はその外周端部を胴
管１１の内壁にろう付けにより固着して配列され、前記
胴管１１の一方の端部にはＥＧＲガスの流入口１４ａ−
１が設けられた端部キャップ１４ａが固着され、また他
方の端部にはＥＧＲガスの流出口１４ｂ−１が設けられ
た端部キャップ１４ｂが固着された構成となし、かつ前
記端部キャップ１４ａ、１４ｂのガス流入口１４ａ−１
および流出口１４ｂ−１の外側開口端部に締結用フラン
ジ１５ａ、１５ｂが外嵌固着された構造となっている。The EG used in this EGR cooling system
As an example of the R cooler, a cooling medium inlet 11-1 and a cooling medium outlet 11 are provided at both ends as shown in FIG.
In the inside of the body tube 11 provided with -2, both ends of the heat transfer tube group 12 are fixed to a sheet metal tube sheet 13 by brazing, while the outer peripheral end of the tube sheet 13 is brazed to the inner wall of the body tube 11. At one end of the body tube 11, an EGR gas inlet 14a-
1 is fixed to the end cap 14a, and the other end is fixed to an end cap 14b provided with an EGR gas outlet 14b-1. , 14b gas inlet 14a-1
In addition, fastening flanges 15a and 15b are externally fitted and fixed to the outer opening end of the outlet 14b-1.
【０００６】[0006]
【発明が解決しようとする課題】しかるに、上記のよう
な構成のＥＧＲ冷却システムにおいては、排気ガス回収
配管路の配管内部やＥＧＲクーラの排気ガス経路に、排
気ガス中のパーティキュレートマター（一般に「ＰＭ」
と略称されている主として固体状の炭素微粒子および液
状あるいは固体状の高分子量炭化水素微粒子からなる微
粒子状の物質）やカーボンなどの異物が付着堆積し、排
気ガス回収配管路の配管においては管内を閉塞したり、
ＥＧＲクーラにおいては熱交換器としての伝熱性能を著
しく低下させたり、場合によっては伝熱管群の排気ガス
経路を閉塞してしまうような熱交換器として重大な致命
的欠陥を呈することがあった。また、前記したような異
物が特に一時的に大量にエンジン燃焼室に侵入するとエ
ンジンの摺動部分の摩耗が増大しエンジン寿命を低下さ
せるという問題があった。However, in the EGR cooling system configured as described above, the particulate matter in the exhaust gas (generally, "EGR cooling system") is placed inside the exhaust gas recovery piping and the exhaust gas path of the EGR cooler. PM "
Foreign substances such as fine particles of mainly solid carbon fine particles and liquid or solid high molecular weight hydrocarbon fine particles, which are abbreviated as) or carbon, adhere and deposit. Blockage,
In the EGR cooler, the heat transfer performance as a heat exchanger is remarkably reduced, and in some cases, a serious fatal defect as a heat exchanger that may block the exhaust gas path of the heat transfer tube group may be exhibited. . In addition, when a large amount of such foreign matter enters the engine combustion chamber, especially temporarily, the abrasion of the sliding portion of the engine increases, and the engine life is shortened.
【０００７】本発明はこのような問題を解決するために
なされたもので、ＥＧＲ冷却システムにおける排気ガス
中のＰＭやカーボンなどの異物の付着堆積を可及的に少
なくすることによって、配管内の閉塞やＥＧＲクーラの
性能低下およびエンジンの異常摩耗を防止しエンジンの
信頼性を高めることができる、ＥＧＲ冷却システムにお
ける異物付着防止方法を提案することを目的とするもの
である。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. An object of the present invention is to minimize the adhesion and deposition of foreign matter such as PM and carbon in exhaust gas in an EGR cooling system, thereby reducing the amount of foreign matter in piping. It is an object of the present invention to propose a method for preventing foreign matter from adhering to an EGR cooling system, which can prevent clogging, deterioration of the performance of an EGR cooler, and abnormal wear of an engine, thereby improving engine reliability.
【０００８】[0008]
【課題を解決するための手段】本発明は、上記課題を解
決するため、エンジンからの燃焼済み排気ガスの一部を
回収し、再び吸気に混合して燃焼するエンジンの回収し
た排気ガスを冷却するための回収配管路の途中に熱交換
器を設置し、エンジン冷却水あるいはその他の冷媒を使
用して前記回収した排気ガスを冷却する排気ガス再循環
燃焼システムにおいて、前記排気ガス回収配管路の前記
熱交換器までの配管内部および／または前記熱交換器の
排気ガスとの接触部の一部または全面に酸化触媒を担持
させた排気ガス再循環燃焼システムにおける異物付着防
止方法を特徴とするものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention recovers a part of burned exhaust gas from an engine, cools the recovered exhaust gas of the engine which mixes with the intake air again and burns it. In the exhaust gas recirculation combustion system that installs a heat exchanger in the middle of the recovery pipe line to cool the recovered exhaust gas using engine cooling water or other refrigerant, the exhaust gas recovery pipe line A method for preventing foreign matter from adhering in an exhaust gas recirculation combustion system in which an oxidation catalyst is supported on a part of or the entire surface of a pipe to the heat exchanger and / or a contact portion of the heat exchanger with exhaust gas. It is.
【０００９】上記した通り、本発明は排気ガス中のＰＭ
やカーボンなどの異物の付着堆積の原因となる主として
液状の高分子量炭化水素からなり有機溶材に可溶な成分
であり可溶性有機物（ＳＯＦ；Ｓｏｌｕｂｌｅ Ｏｒｇ
ａｎｉｃ Ｆｒａｃｔｉｏｎ）を抑制する手段として酸
化触媒を用いたことを特徴とするものである。すなわち
カーボン粒子と排気ガス回収配管路の配管内部やＥＧＲ
クーラの内壁との間やカーボン粒子相互間に存在して接
着機能を果たす物質はＳＯＦといわれ、燃料中に含有す
る硫黄が化合した有機物質や吸気および排気ガス中に漏
洩したエンジン・オイルなどが変性した粘着性物質から
なるものである。そして本発明では酸化触媒により排気
ガス中の煤やカーボンを結合固着させるＳＯＦを酸化燃
焼させてカーボン粒子を乾燥させて、排気ガス回収配管
路の配管内部やＥＧＲクーラの内壁から剥離させ、排気
ガスの風圧により剥離した物質を吹飛ばして煤やカーボ
ンの付着堆積を防止するとともに、煤やカーボンを酸化
燃焼してＣＯ２にする作用を有しているからである。本
発明で用いる酸化触媒としては、白金、白金−ロジウ
ム、酸化バナジウム、酸化ロジウム、酸化パラジウムな
どがある。本発明ではこのような酸化触媒をＥＧＲクー
ラまでの排気ガス回収配管路の配管内部および／または
前記ＥＧＲクーラの排気ガスとの接触部の一部または全
面に設けるもので、その手段としては触媒効果を促進す
るために酸化触媒金属を排気ガス通路にコーティングし
たり酸化触媒を担持した金属帯箔からなる触媒コンバー
ターを挿入溶着する方法を用いることができる。なお、
ＥＧＲ冷却システムの圧力損失を少なくするために前記
酸化触媒は排気ガスの温度が高くかつカーボンが付着堆
積し易い場所を選定して設けるのが好ましい。しかしＥ
ＧＲクーラ内部の伝熱管群または伝熱板群に前記酸化触
媒を設ける場合は、該クーラに導入される排気ガスの温
度がこの酸化触媒によるＳＯＦの酸化燃焼によって一層
高くなり冷却水が沸騰することが予想されるので、前記
伝熱管群または伝熱板群における排気ガスの流入口側よ
り、該排気ガスが冷却水により多少冷却されたほぼ中間
部に部分的に設置することが好ましい場合もある。[0009] As described above, the present invention relates to a method for reducing PM in exhaust gas.
Is a component which is mainly composed of a liquid high molecular weight hydrocarbon causing adhesion and deposition of foreign substances such as carbon and carbon, and is soluble in an organic solvent and is a soluble organic substance (SOF; Soluble Org).
The present invention is characterized in that an oxidation catalyst is used as a means for suppressing an anionic fraction. That is, the inside of the carbon particles and the exhaust gas recovery piping and the EGR
A substance that exists between the inner wall of the cooler and between the carbon particles and performs the bonding function is called SOF, and organic substances combined with sulfur contained in the fuel, engine oil leaked into the intake and exhaust gases, etc. It is composed of a modified adhesive substance. According to the present invention, the SOF that binds and fixes soot and carbon in the exhaust gas by the oxidation catalyst is oxidized and burned to dry the carbon particles, and the carbon particles are separated from the inside of the exhaust gas recovery piping and the inner wall of the EGR cooler. This has the effect of blowing off the material separated by the wind pressure to prevent the adhesion and deposition of soot and carbon, and oxidizing and burning soot and carbon to produce CO 2 . Examples of the oxidation catalyst used in the present invention include platinum, platinum-rhodium, vanadium oxide, rhodium oxide, and palladium oxide. In the present invention, such an oxidation catalyst is provided inside the pipe of the exhaust gas recovery pipe to the EGR cooler and / or at a part or the whole of the contact portion of the EGR cooler with the exhaust gas. In order to promote the oxidation, a method of coating an oxidation catalyst metal on an exhaust gas passage or inserting and welding a catalytic converter composed of a metal strip supporting an oxidation catalyst can be used. In addition,
In order to reduce the pressure loss of the EGR cooling system, it is preferable that the oxidation catalyst is provided in a place where the temperature of the exhaust gas is high and carbon is easily deposited and deposited. But E
When the oxidation catalyst is provided in the heat transfer tube group or the heat transfer plate group inside the GR cooler, the temperature of the exhaust gas introduced into the cooler is further increased by the oxidation combustion of the SOF by the oxidation catalyst, and the cooling water boils. Therefore, it may be preferable to partially install the exhaust gas in the heat transfer tube group or the heat transfer plate group at an almost intermediate portion where the exhaust gas is somewhat cooled by the cooling water from the inlet side of the exhaust gas. .
【００１０】[0010]
【発明の実施の形態】図１は本発明に係るＥＧＲ冷却シ
ステムにおける排気ガス回収配管路に酸化触媒金属をコ
ーティングした担持させた例を示す拡大縦断面図、図２
は平板状の金属帯箔と波板状の金属帯箔を渦巻状に巻回
して相互の当接点をろう付けし管内部に挿設した例を示
す図で、（ａ）は拡大縦断面図、（ｂ）は拡大横断面
図、図３は１枚の波板状の金属帯箔を管内部に挿設した
例を示す図で、（ａ）は拡大縦断面図、（ｂ）は拡大横
断面図、図４は同上のＥＧＲ冷却システムにおけるＥＧ
Ｒクーラに酸化触媒を担持させる方法を例示したもの
で、（ａ）は多管式ＥＧＲクーラの伝熱管群の内面に酸
化触媒をコーティングした例を示す一部拡大断面図、
（ｂ）は多板式ＥＧＲクーラ伝熱板群の表面に酸化触媒
をコーティングした例を示す一部拡大断面図であり、５
は排気ガス回収配管路、７は酸化触媒、８は触媒コンバ
ーターである。FIG. 1 is an enlarged vertical sectional view showing an example in which an exhaust gas recovery pipe in an EGR cooling system according to the present invention is supported by coating an oxidation catalyst metal thereon.
Is a diagram showing an example in which a flat metal foil and a corrugated metal foil are spirally wound, their contact points are brazed, and inserted into the pipe, and (a) is an enlarged vertical sectional view , (B) is an enlarged cross-sectional view, FIG. 3 is a diagram showing an example in which one corrugated metal band foil is inserted inside the tube, (a) is an enlarged vertical sectional view, and (b) is an enlarged FIG. 4 is a cross-sectional view, and FIG.
(A) is a partially enlarged cross-sectional view showing an example in which an oxidation catalyst is coated on an inner surface of a heat transfer tube group of a multi-tube EGR cooler;
(B) is a partially enlarged cross-sectional view showing an example in which the surface of a group of multi-plate type EGR cooler heat transfer plates is coated with an oxidation catalyst.
Denotes an exhaust gas recovery pipe line, 7 denotes an oxidation catalyst, and 8 denotes a catalytic converter.
【００１１】すなわち、図１〜図３はＥＧＲ冷却システ
ムにおける排気ガス回収配管路５の内面に酸化触媒７を
設けて担持させたものを示す実施例で、図１は酸化触媒
７を直接配管路５内面にコーティングした例を示すもの
である。また図２は２０重量％クロム、５重量％アルミ
ニウム、微量の希土類元素を含有して残部鉄よりなり、
かつ幅７５ｍｍ、厚さ５０μｍで波のピッチ２．５ｍ
ｍ、高さ１．２ｍｍに形成した波板状の金属帯箔と、同
一材質、同一幅で同一厚みからなる平板状の金属帯箔と
をセル密度４００セル／ｉｎ２となるように渦巻状に巻
回し、相互の当接点をニッケルろう付けし、その表面を
ウォッシュコートした後、触媒コートして酸化触媒７を
担持させた触媒コンバーター８を配管路５内部に挿入し
た例を示すものである。さらに図３は酸化触媒７を担持
した図２と同様の１枚の波板状の金属帯箔からなる触媒
コンバーター８を、例えば図５に示すように配管路５内
部に挿入溶着した例をそれぞれ示したものである。この
場合、酸化触媒７は排気ガス回収配管路５の内周全面ま
たは部分的に担持させる。1 to 3 show an embodiment in which an oxidation catalyst 7 is provided and supported on the inner surface of an exhaust gas recovery pipe line 5 in an EGR cooling system, and FIG. 5 shows an example in which the inner surface is coated. Also, FIG. 2 is composed of 20% by weight of chromium, 5% by weight of aluminum, a small amount of rare earth element and the balance iron.
And width of 75mm, thickness of 50μm and wave pitch of 2.5m
m, a corrugated metal band foil formed to a height of 1.2 mm and a flat metal band foil of the same material, width and thickness having a spiral shape so as to have a cell density of 400 cells / in 2. This shows an example in which a catalytic converter 8 carrying a catalyst coating and carrying an oxidation catalyst 7 is inserted into the pipe line 5 after nickel-brazing the contact points of each other and wash-coating the surfaces thereof. . FIG. 3 shows an example in which a single catalytic converter 8 made of a corrugated metal foil similar to that shown in FIG. 2 supporting an oxidation catalyst 7 is inserted and welded into a pipe 5 as shown in FIG. 5, for example. It is shown. In this case, the oxidation catalyst 7 is carried on the entire inner circumference or a part of the exhaust gas recovery piping 5.
【００１２】また、図４はＥＧＲ冷却システムにおける
ＥＧＲクーラに酸化触媒７を貼着して担持させたもの
で、（ａ）は多管式ＥＧＲクーラの伝熱管群１２の各管
内面に酸化触媒７をコーティングして担持させた例、
（ｂ）は多板式ＥＧＲクーラの伝熱板群１２−１の各板
内面に酸化触媒７をコーティングして担持させた例をそ
れぞれ示したものである。この場合も多管式ＥＧＲクー
ラにおける酸化触媒７は各伝熱管群１２の内周全面ある
いは部分的に担持させる。また、多板式ＥＧＲクーラに
おける酸化触媒７は伝熱板群１２−１の内面全面あるい
は部分的に担持させる。FIG. 4 shows an EGR cooler in an EGR cooling system in which an oxidation catalyst 7 is adhered and carried. FIG. 4A shows an oxidation catalyst on the inner surface of each tube of a heat transfer tube group 12 of a multi-tube EGR cooler. 7, coated and supported,
(B) shows an example in which the oxidation catalyst 7 is coated and supported on the inner surface of each plate of the heat transfer plate group 12-1 of the multi-plate EGR cooler. Also in this case, the oxidation catalyst 7 in the multi-tube EGR cooler is carried on the entire inner periphery of each heat transfer tube group 12 or partially. Further, the oxidation catalyst 7 in the multi-plate type EGR cooler is carried on the entire inner surface of the heat transfer plate group 12-1 or partially.
【００１３】なお、酸化触媒担持場所の組合わせとして
は、ＥＧＲクーラまでの排気ガス回収配管路内周面全
面とＥＧＲクーラの伝熱管内周面全面または伝熱板内面
全面、ＥＧＲクーラまでの排気ガス回収配管路内周面
一部とＥＧＲクーラの伝熱管内周面一部または伝熱板内
面一部、ＥＧＲクーラまでの排気ガス回収配管路内周
面全面とＥＧＲクーラの伝熱管内周面一部または伝熱板
内面一部、ＥＧＲクーラまでの排気ガス回収配管路内
周面一部とＥＧＲクーラの伝熱管内周面全面または伝熱
板内面全面など種々の組合わせが考えられる。[0013] The combination of the oxidation catalyst carrying places includes the entire inner peripheral surface of the exhaust gas recovery pipe to the EGR cooler, the entire inner peripheral surface of the heat transfer tube or the inner surface of the heat transfer plate of the EGR cooler, and the exhaust gas to the EGR cooler. Part of the inner peripheral surface of the gas recovery piping, part of the inner peripheral surface of the heat transfer tube or part of the inner surface of the heat transfer plate of the EGR cooler, the entire inner peripheral surface of the exhaust gas recovery piping up to the EGR cooler, and the inner peripheral surface of the heat transfer tube of the EGR cooler Various combinations are possible, such as a part or a part of the inner surface of the heat transfer plate, a part of the inner peripheral surface of the exhaust gas recovery pipe to the EGR cooler, and the entire inner peripheral surface of the heat transfer tube or the entire inner surface of the heat transfer plate of the EGR cooler.
【００１４】[0014]
【発明の効果】以上説明したごとく、本発明によれば、
ＥＧＲクーラまでの排気ガス回収配管路の配管内部やＥ
ＧＲクーラの排気ガス経路に担持させた酸化触媒による
ＳＯＦの燃焼・分解により、ＥＧＲ冷却システムにおけ
る排気ガス中のＰＭやカーボンなどの異物の付着堆積を
可及的に少なくすることができるので、配管内の閉塞や
ＥＧＲクーラの性能低下およびエンジンの異常摩耗を防
止しエンジンの信頼性を高めることができるという優れ
た効果を奏する。As described above, according to the present invention,
The inside of the exhaust gas recovery piping to the EGR cooler and E
The combustion and decomposition of SOF by the oxidation catalyst carried in the exhaust gas path of the GR cooler can minimize the adhesion and deposition of foreign substances such as PM and carbon in the exhaust gas in the EGR cooling system. This provides an excellent effect that it is possible to prevent blockage of the inside, deterioration of the performance of the EGR cooler, and abnormal wear of the engine, thereby improving the reliability of the engine.
【図１】本発明に係るＥＧＲ冷却システムにおける排気
ガス回収配管路に酸化触媒金属をコーティングした担持
させた例を示す拡大縦断面図である。FIG. 1 is an enlarged longitudinal sectional view showing an example in which an exhaust gas recovery piping in an EGR cooling system according to the present invention is supported by coating an oxidation catalyst metal thereon.
【図２】平板状の金属帯箔と波板状の金属帯箔を渦巻状
に巻回して相互の当接点をろう付けし管内部に挿設した
例を示す図で、（ａ）は拡大縦断面図、（ｂ）は拡大横
断面図である。FIG. 2 is a diagram showing an example in which a flat metal foil and a corrugated metal foil are spirally wound, their mutual contact points are brazed, and inserted into a pipe; FIG. 4B is a vertical cross-sectional view, and FIG.
【図３】１枚の波板状の金属帯箔を管内部に挿設した例
を示す図で、（ａ）は拡大縦断面図、（ｂ）は拡大横断
面図である。FIGS. 3A and 3B are views showing an example in which one corrugated metal band foil is inserted into a tube; FIG. 3A is an enlarged vertical sectional view, and FIG.
【図４】同上のＥＧＲ冷却システムにおけるＥＧＲクー
ラに酸化触媒を担持させる方法を例示したもので、
（ａ）は多管式ＥＧＲクーラの伝熱管群の内面に酸化触
媒をコーティングした例を示す一部拡大断面図、（ｂ）
は多板式ＥＧＲクーラ伝熱板群に表面に酸化触媒をコー
ティングした例を示す一部拡大断面図である。FIG. 4 illustrates a method of supporting an oxidation catalyst on an EGR cooler in the EGR cooling system according to the first embodiment.
(A) is a partially enlarged sectional view showing an example in which an oxidation catalyst is coated on the inner surface of a heat transfer tube group of a multi-tube EGR cooler, (b)
FIG. 3 is a partially enlarged sectional view showing an example in which an oxidation catalyst is coated on the surface of a group of multi-plate type EGR cooler heat transfer plates.
【図５】本発明の対象とするＥＧＲ冷却システムの一例
を示す概略図である。FIG. 5 is a schematic view showing an example of an EGR cooling system to which the present invention is applied.
【図６】同上のＥＧＲ冷却システムにおける多管式のＥ
ＧＲクーラの一例を示す一部破断平面図である。FIG. 6 shows a multi-tube E in the EGR cooling system according to the first embodiment.
It is a partially broken plan view showing an example of a GR cooler.
１ エンジン ２ 吸気系 ３ 排気系 ４ マフラー ５ 排気ガス回収配管路 ６ ＥＧＲクーラ ７ 酸化触媒 ８ 触媒コンバーター １１ 胴管 １１−１ 冷却媒体流入口 １１−２ 冷却媒体流出口 １２ 伝熱管群 １３ チューブシート １４ａ、１４ｂ 端部キャップ １４ａ−１ ＥＧＲガスの流入口 １４ｂ−１ ＥＧＲガスの流出口 １５ａ、１５ｂ 締結用フランジ DESCRIPTION OF SYMBOLS 1 Engine 2 Intake system 3 Exhaust system 4 Muffler 5 Exhaust gas recovery pipe line 6 EGR cooler 7 Oxidation catalyst 8 Catalytic converter 11 Body tube 11-1 Cooling medium inlet 11-2 Cooling medium outlet 12 Heat transfer tube group 13 Tube sheet 14a , 14b End cap 14a-1 EGR gas inlet 14b-1 EGR gas outlet 15a, 15b Fastening flange
Claims (1)
を回収し、再び吸気に混合して燃焼するエンジンの回収
した排気ガスを冷却するための回収配管路の途中に熱交
換器を設置し、エンジン冷却水あるいはその他の冷媒を
使用して前記回収した排気ガスを冷却する排気ガス再循
環燃焼システムにおいて、前記排気ガス回収配管路の前
記熱交換器までの配管内部および／または前記熱交換器
の排気ガスとの接触部の一部または全面に酸化触媒を担
持させたことを特徴とする排気ガス再循環燃焼システム
における異物付着防止方法。1. A heat exchanger is provided in the middle of a recovery pipe line for collecting a part of the burned exhaust gas from the engine, mixing the exhaust gas with the intake air again, and cooling the recovered exhaust gas of the engine. An exhaust gas recirculation combustion system that cools the recovered exhaust gas using engine cooling water or other refrigerant, wherein the exhaust gas recovery pipe line has a pipe interior to the heat exchanger and / or the heat exchanger A method for preventing foreign matter from adhering in an exhaust gas recirculation combustion system, wherein an oxidation catalyst is carried on a part or the entire surface of a contact portion with the exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10332678A JP2000146465A (en) | 1998-09-03 | 1998-11-24 | Method for preventing adhesion of foreign object in exhaust gas recirculation burning system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24963298 | 1998-09-03 | ||
| JP10-249632 | 1998-09-03 | ||
| JP10332678A JP2000146465A (en) | 1998-09-03 | 1998-11-24 | Method for preventing adhesion of foreign object in exhaust gas recirculation burning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000146465A true JP2000146465A (en) | 2000-05-26 |
| JP2000146465A5 JP2000146465A5 (en) | 2006-01-12 |
Family
ID=26539403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10332678A Withdrawn JP2000146465A (en) | 1998-09-03 | 1998-11-24 | Method for preventing adhesion of foreign object in exhaust gas recirculation burning system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000146465A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004077024A (en) * | 2002-08-19 | 2004-03-11 | Denso Corp | Exhaust heat exchanger device |
| WO2004042222A1 (en) * | 2002-11-08 | 2004-05-21 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Exhaust system and method for operating the same |
| WO2005028848A1 (en) * | 2003-09-18 | 2005-03-31 | Behr Gmbh & Co. Kg | Exhaust-gas heat exchanger, in particular exhaust-gas cooler for exhaust gas recirculation in motor vehicles |
| WO2006100090A1 (en) * | 2005-03-24 | 2006-09-28 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Exhaust system with an exhaust gas treatment unit and a heat exchanger in an exhaust recycle line |
| FR2930296A1 (en) * | 2008-04-16 | 2009-10-23 | Faurecia Sys Echappement | Exhaust line for engine unit of motor vehicle, has communication opening with heat exchanger and purification unit, where internal section of opening is fifty percentages of that of exchanger perpendicular to gas flow direction |
| EP2130567A1 (en) * | 2008-06-03 | 2009-12-09 | Peugeot Citroen Automobiles SA | Arrangement of a flame-arrester system in the engine of an automobile |
| EP2336538A1 (en) * | 2009-12-17 | 2011-06-22 | Volkswagen Aktiengesellschaft | Device for reclaiming exhaust gas and method for heating a coolant of a combustion engine and use of the exhaust gas reclaim device |
| JP2013224607A (en) * | 2012-04-20 | 2013-10-31 | Isuzu Motors Ltd | Egr cooler |
| JP7371754B1 (en) * | 2022-12-20 | 2023-10-31 | いすゞ自動車株式会社 | EGR system |
| JP7448698B2 (en) | 2018-01-04 | 2024-03-12 | 日本碍子株式会社 | Heat exchange parts and heat exchangers |
-
1998
- 1998-11-24 JP JP10332678A patent/JP2000146465A/en not_active Withdrawn
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004077024A (en) * | 2002-08-19 | 2004-03-11 | Denso Corp | Exhaust heat exchanger device |
| WO2004042222A1 (en) * | 2002-11-08 | 2004-05-21 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Exhaust system and method for operating the same |
| KR100908979B1 (en) * | 2002-11-08 | 2009-07-22 | 에미텍 게젤샤프트 퓌어 에미시온스테크놀로기 엠베하 | Exhaust system and operation method of exhaust system |
| CN100398791C (en) * | 2002-11-08 | 2008-07-02 | 排放技术有限公司 | Exhaust system and method for operating the same |
| US7481041B2 (en) | 2002-11-08 | 2009-01-27 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Exhaust system and method for operating the same |
| WO2005028848A1 (en) * | 2003-09-18 | 2005-03-31 | Behr Gmbh & Co. Kg | Exhaust-gas heat exchanger, in particular exhaust-gas cooler for exhaust gas recirculation in motor vehicles |
| JP2007506020A (en) * | 2003-09-18 | 2007-03-15 | ベール ゲーエムベーハー ウント コー カーゲー | Exhaust gas heat transfer body, especially exhaust gas cooler for exhaust gas recirculation in automobiles |
| US7481040B2 (en) | 2003-09-18 | 2009-01-27 | Behr Gmbh & Co. Kg | Exhaust-gas heat exchanger, in particular exhaust-gas cooler for exhaust gas recirculation in motor vehicles |
| US7490595B2 (en) | 2005-03-24 | 2009-02-17 | Emitec Geseelschaft Fur Emissionstechnologie Mbh | Exhaust gas system having an exhaust gas treatment unit and a heat exchanger in an exhaust gas recirculation line |
| KR100901548B1 (en) | 2005-03-24 | 2009-06-08 | 에미텍 게젤샤프트 퓌어 에미시온스테크놀로기 엠베하 | Exhaust gas system for an internal combustion engine |
| WO2006100090A1 (en) * | 2005-03-24 | 2006-09-28 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Exhaust system with an exhaust gas treatment unit and a heat exchanger in an exhaust recycle line |
| FR2930296A1 (en) * | 2008-04-16 | 2009-10-23 | Faurecia Sys Echappement | Exhaust line for engine unit of motor vehicle, has communication opening with heat exchanger and purification unit, where internal section of opening is fifty percentages of that of exchanger perpendicular to gas flow direction |
| EP2130567A1 (en) * | 2008-06-03 | 2009-12-09 | Peugeot Citroen Automobiles SA | Arrangement of a flame-arrester system in the engine of an automobile |
| EP2336538A1 (en) * | 2009-12-17 | 2011-06-22 | Volkswagen Aktiengesellschaft | Device for reclaiming exhaust gas and method for heating a coolant of a combustion engine and use of the exhaust gas reclaim device |
| JP2013224607A (en) * | 2012-04-20 | 2013-10-31 | Isuzu Motors Ltd | Egr cooler |
| JP7448698B2 (en) | 2018-01-04 | 2024-03-12 | 日本碍子株式会社 | Heat exchange parts and heat exchangers |
| JP7371754B1 (en) * | 2022-12-20 | 2023-10-31 | いすゞ自動車株式会社 | EGR system |
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