JP3229595B2 - Exhaust gas purification equipment - Google Patents
Exhaust gas purification equipmentInfo
- Publication number
- JP3229595B2 JP3229595B2 JP36018798A JP36018798A JP3229595B2 JP 3229595 B2 JP3229595 B2 JP 3229595B2 JP 36018798 A JP36018798 A JP 36018798A JP 36018798 A JP36018798 A JP 36018798A JP 3229595 B2 JP3229595 B2 JP 3229595B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- honeycomb structure
- ceramic honeycomb
- purifier
- section
- 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 - Lifetime
Links
- 238000000746 purification Methods 0.000 title claims description 20
- 239000000919 ceramic Substances 0.000 claims description 46
- 230000002093 peripheral effect Effects 0.000 claims description 22
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 81
- 239000004215 Carbon black (E152) Substances 0.000 description 13
- 229930195733 hydrocarbon Natural products 0.000 description 13
- 150000002430 hydrocarbons Chemical class 0.000 description 13
- 230000035939 shock Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 229910010293 ceramic material Inorganic materials 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000009924 canning Methods 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車等に使用される
内燃機関（以下、エンジンという）の排ガス浄化装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus for an internal combustion engine (hereinafter, referred to as an engine) used in an automobile or the like.
【０００２】[0002]
【従来の技術】近年、自動車等の排ガス規制が厳しくな
り、特にエンジン始動直後の暖機が完了していない状態
において、排ガス中に含まれる一酸化炭素（ＣＯ）、炭
化水素（ＨＣ）、窒素酸化物（ＮＯｘ）等の有害成分を
浄化して、その量を低減することがますます厳しく要求
されている。この対策として、エンジンの排ガス出口に
容量の小さい第１の浄化器を設置し、次に容量の大きい
第２の浄化器を設置した排ガス浄化装置が知られてい
る。2. Description of the Related Art In recent years, regulations on exhaust gas from automobiles and the like have become strict, and particularly in a state where warm-up immediately after engine start has not been completed, carbon monoxide (CO), hydrocarbon (HC), nitrogen There is an increasingly stringent demand to purify and reduce the amount of harmful components such as oxides (NOx). As a countermeasure, there is known an exhaust gas purifying apparatus in which a small-capacity first purifier is installed at an exhaust gas outlet of an engine, and a second large-capacity second purifier is installed next.
【０００３】上述した従来の排ガス浄化装置において
は、主としてエンジンが始動直後の暖機が完了していな
い状態においては、温度が上昇しやすく触媒が速やかに
活性化する第１の排ガス浄化器により排ガス中の有害成
分を浄化するとともに、暖機が完了したエンジン状態に
おいては、容量の大きい第２の排ガス浄化器により排ガ
ス中の有害成分を浄化している。In the conventional exhaust gas purifying apparatus described above, mainly when the engine is not completely warmed up immediately after starting, the first exhaust gas purifier in which the temperature easily rises and the catalyst is quickly activated is used. The harmful components in the exhaust gas are purified by the second exhaust gas purifier having a large capacity in the engine state in which the warm-up is completed while purifying the harmful components in the exhaust gas.
【０００４】[0004]
【発明が解決しようとする課題】上述した従来の排ガス
浄化装置においては、第１の排ガス浄化器の容量を小さ
くして、容量の大きな浄化器と比較して速やかに触媒を
活性化しようとしているが、排ガス浄化器として使用さ
れている好ましくはセラミックスからなるハニカム構造
体の構成は、製造の容易さ等の点からセル断面四角形状
または三角形状のものであった。In the above-mentioned conventional exhaust gas purifying apparatus, the capacity of the first exhaust gas purifier is reduced, and the catalyst is activated more quickly than a purifier having a large capacity. However, the configuration of the honeycomb structure preferably made of ceramics used as the exhaust gas purifier has a rectangular or triangular cell cross section in view of easiness of production and the like.
【０００５】そのため、第１の排ガス浄化器の耐熱衝撃
性が十分でなく、エンジン出口の高温の排ガスの近傍に
第１の排ガス浄化器を設置することができず、エンジン
出口から配管を介して離れた位置に設置するか、直下に
設置するときはエンジン性能を犠牲にし、エンジンから
排出されるガス温度そのものを低くして、ハニカム構造
体にあたる排ガスの温度を低くしなければならない問題
があった。その結果、第１の排ガス浄化器の容量を小さ
くして、特にエンジン始動時の暖機が完了していない状
態における浄化性能を高くしようとしても、ハニカム構
造体にあたる排ガスの温度が低いため触媒活性化が可能
な温度になるまでに時間がかかり、十分にその目的を達
成できず、やはり良好な排ガス浄化率が得られないとい
う問題があった。[0005] Therefore, the thermal shock resistance of the first exhaust gas purifier is not sufficient, and the first exhaust gas purifier cannot be installed in the vicinity of the high-temperature exhaust gas at the engine outlet. When installed at a distance or directly below, there is a problem that the engine performance must be sacrificed, the temperature of the gas discharged from the engine must be lowered, and the temperature of the exhaust gas hitting the honeycomb structure must be lowered. . As a result, even if the capacity of the first exhaust gas purifier is reduced and the purifying performance is particularly increased in a state where the warm-up at the time of starting the engine is not completed, the temperature of the exhaust gas hitting the honeycomb structure is low. However, it takes a long time to reach a temperature at which the gasification can be performed, so that the object cannot be sufficiently achieved, and a satisfactory exhaust gas purification rate cannot be obtained.
【０００６】本発明の目的は上述した課題を解消して、
特にエンジン始動直後の暖機が完了していない状態にお
いて、排ガス中のＣＯ、ＨＣ、ＮＯｘ等の有害成分を良
好に浄化することのできる排ガス浄化装置を提供しよう
とするものである。An object of the present invention is to solve the above-mentioned problems,
In particular, an object of the present invention is to provide an exhaust gas purifying apparatus capable of satisfactorily purifying harmful components such as CO, HC, and NOx in exhaust gas in a state where warm-up immediately after engine start is not completed.
【０００７】[0007]
【課題を解決するための手段】本発明の排ガス浄化装置
は、内燃機関の排ガス出口から排ガスの流れの下流に向
けて、順に配設される第１の排ガス浄化器、第２の排ガ
ス浄化器を少なくとも有する排ガス浄化装置において、
前記第１の排ガス浄化器に少なくとも１つのセル断面六
角形状のセラミックハニカム構造体を搭載し、（１）こ
のセル断面六角形状のセラミックハニカム構造体の外周
部の隔壁の厚さを中心部の厚さより厚くしたこと、
（２）このセル断面六角形状のセラミックハニカム構造
体の外周部のセルに補強リブを形成したことを特徴とす
るものである。An exhaust gas purifying apparatus according to the present invention comprises a first exhaust gas purifier and a second exhaust gas purifier arranged in order from an exhaust gas outlet of an internal combustion engine to a downstream of an exhaust gas flow. In an exhaust gas purification device having at least
At least one ceramic honeycomb structure having a hexagonal cell cross section is mounted on the first exhaust gas purifier. (1) The thickness of a partition wall on the outer peripheral portion of the ceramic honeycomb structure having a hexagonal cross section on a cell is defined as a thickness at a central portion. Thicker than
(2) Reinforcing ribs are formed on cells on the outer peripheral portion of the ceramic honeycomb structure having a hexagonal cell cross section.
【０００８】[0008]
【作用】上述した構成において、第１の浄化器として耐
熱衝撃性の良好なセル断面六角形状のセラミックハニカ
ム構造体を使用することで、第１の浄化器をエンジン出
口近傍の排ガス温度の高い位置（例えば、最高温度が９
００℃以上となる位置）に設置でき、又は排ガス温度を
高温に設定でき、ハニカム構造体に高温の排ガスを当て
ることができるため、ハニカム構造体を速やかに高温と
でき、触媒の活性化を速やかに達成できる。In the above-described structure, the first purifier uses a ceramic honeycomb structure having a hexagonal cell cross section with good thermal shock resistance as the first purifier, so that the first purifier can be located at a position near the engine outlet where the exhaust gas temperature is high. (For example, if the maximum temperature is 9
(Higher than 00 ° C), or the exhaust gas temperature can be set to a high temperature, and high-temperature exhaust gas can be applied to the honeycomb structure. Therefore, the honeycomb structure can be quickly heated to a high temperature, and the catalyst can be quickly activated. Can be achieved.
【０００９】なお、本発明では、少なくとも第１の排ガ
ス浄化器がセル断面六角形状のハニカム構造体から形成
されていれば、その下流側の第２の排ガス浄化器および
それ以降の排ガス浄化器の構成は特に限定するものでな
くどのような形状のものでも使用できる。すなわち、同
一セル密度の場合、四角セル、三角セルは六角セルに比
べてＧＳＡ（幾何学的表面積）が大きいため、排ガスと
の接触面積も大きく、エンジン暖機が終了した状態では
六角セルより排ガス浄化率が高いため、第２の排ガス浄
化器およびそれ以降の排ガス浄化器としてセル断面四角
形状やセル断面三角形状のハニカム構造体を使用する。In the present invention, if at least the first exhaust gas purifier is formed of a honeycomb structure having a hexagonal cell cross section, the second exhaust gas purifier downstream of the honeycomb structure and the subsequent exhaust gas purifiers may be used. The configuration is not particularly limited, and any shape can be used. That is, when the cell density is the same, the square cell and the triangular cell have a larger GSA (geometric surface area) than the hexagonal cell, so that the contact area with the exhaust gas is large. Since the purification rate is high, a honeycomb structure having a square cell cross section or a triangular cell cross section is used as the second exhaust gas purifier and subsequent exhaust gas purifiers.
【００１０】また、後述するように、セル断面六角形状
のセラミックハニカム構造体は、若干アイソスタティッ
ク強度が低く、その際の破壊が外周部で発生するため、
外周部の隔壁の厚さを厚くしたり、外周部の不完全セル
をセラミック材料で目封じしたり、外周部のセルの形状
のみをセル断面四角形状としたり、外周部のセルに補強
リブを形成することで、外周部の強度を高める。Further, as will be described later, the ceramic honeycomb structure having a hexagonal cell cross section has a slightly low isostatic strength, and breakage at that time occurs on the outer peripheral portion.
Increase the thickness of the partition walls in the outer peripheral portion, plug incomplete cells in the outer peripheral portion with a ceramic material, make only the outer peripheral cell shape a square cell cross section, or use reinforcing ribs in the outer peripheral cell. By forming, the strength of the outer peripheral portion is increased.
【００１１】[0011]
【実施例】図１は本発明の排ガス浄化装置の一実施例を
適用した自動車用エンジンの排ガス流通部分の一例を示
す図である。図１において、自動車用エンジンの排ガス
流通部分は、エンジン本体１、排気マニホールド２、排
ガス浄化装置１０で構成される。排ガス浄化装置１０
は、排気マニホールド２により集められた直後の排ガス
中の酸素分圧に応じた信号を出力する酸素センサ１１、
この酸素センサ１１からの信号を受信してエンジンへの
燃料供給量を決定するエンジン制御コンピュータ１２、
排気マニホールド２により集められた排ガスを第１の排
ガス浄化器１６に送出する排気管２１、排気管２１から
流入する排ガスを浄化する第１の排ガス浄化器１６、第
１の排ガス浄化器１６を通過した排ガスを第２の排ガス
浄化器１７に送出する排気管２２、排気管２２から流入
する排ガスをさらに浄化する第２の排ガス浄化器１７で
構成される。FIG. 1 is a diagram showing an example of an exhaust gas distribution portion of an automobile engine to which an embodiment of the exhaust gas purifying apparatus of the present invention is applied. In FIG. 1, an exhaust gas distribution portion of an automobile engine includes an engine body 1, an exhaust manifold 2, and an exhaust gas purifying device 10. Exhaust gas purification device 10
An oxygen sensor 11, which outputs a signal corresponding to the oxygen partial pressure in the exhaust gas immediately after collected by the exhaust manifold 2,
An engine control computer 12 that receives a signal from the oxygen sensor 11 and determines a fuel supply amount to the engine;
Exhaust gas collected by the exhaust manifold 2 is sent to a first exhaust gas purifier 16 through an exhaust pipe 21, a first exhaust gas purifier 16 that purifies exhaust gas flowing from the exhaust pipe 21, and passes through the first exhaust gas purifier 16. An exhaust pipe 22 for sending the exhaust gas thus purified to the second exhaust gas purifier 17 and a second exhaust gas purifier 17 for further purifying the exhaust gas flowing from the exhaust pipe 22.
【００１２】図１に示す例では、排気マニホールド２に
より集められた排ガスの流れの下流に向けて、酸素セン
サ１１、第１の排ガス浄化器１６、第２の排ガス浄化器
１７がこの順に配設される。排ガス中のガス検出器とし
ての酸素センサ１１は、排気マニホールド２と第１の排
ガス浄化器１６との間に配設され、理論空燃比に対し燃
料過剰を示すリッチ信号、燃料不足を示すリーン信号の
２値の信号を出力するタイプの酸素センサを使用する。
また、排気マニホールド２で集められた排ガス中の酸素
分圧に比例した信号を出力する全領域空燃比センサを使
用することも可能である。In the example shown in FIG. 1, an oxygen sensor 11, a first exhaust gas purifier 16, and a second exhaust gas purifier 17 are arranged in this order downstream of the flow of the exhaust gas collected by the exhaust manifold 2. Is done. An oxygen sensor 11 as a gas detector in the exhaust gas is provided between the exhaust manifold 2 and the first exhaust gas purifier 16 and has a rich signal indicating an excess fuel with respect to a stoichiometric air-fuel ratio, and a lean signal indicating a fuel shortage. An oxygen sensor that outputs a binary signal of the following type is used.
It is also possible to use a full range air-fuel ratio sensor that outputs a signal proportional to the oxygen partial pressure in the exhaust gas collected by the exhaust manifold 2.
【００１３】本発明で重要なのは、第１の排ガス浄化器
１６に少なくとも１つのセル断面六角形状のセラミック
ハニカム構造体を搭載することである。このように構成
することで、図１に示すように、従来の排ガス浄化装置
の第１の排ガス浄化器の位置と比較して、排気マニホー
ルド２の近傍、すなわち排気マニホールド２の直後で排
ガスの最高温度が９００℃以上になる様に、第１の排ガ
ス浄化器１６を配設できる。一方、第２の排ガス浄化器
１７の位置は従来の排ガス浄化器の位置と何等かわら
ず、浄化すべき排ガスの温度も低いため、第２の排ガス
浄化器１７に使用するセラミックハニカム構造体の構造
は特に限定するものでなく、従来から知られているセル
断面四角形状、セル断面三角形状を使用でき、もちろん
セル断面六角形状のものを使用しても良い。以下、本発
明で使用するセル断面六角形状のセラミックハニカム構
造体について説明する。It is important in the present invention that at least one ceramic honeycomb structure having a hexagonal cell cross section is mounted on the first exhaust gas purifier 16. With such a configuration, as shown in FIG. 1, as compared with the position of the first exhaust gas purifier of the conventional exhaust gas purification device, the highest exhaust gas flow near the exhaust manifold 2, that is, immediately after the exhaust manifold 2. The first exhaust gas purifier 16 can be provided so that the temperature becomes 900 ° C. or higher. On the other hand, since the position of the second exhaust gas purifier 17 is not different from the position of the conventional exhaust gas purifier and the temperature of the exhaust gas to be purified is low, the structure of the ceramic honeycomb structure used for the second exhaust gas purifier 17 Is not particularly limited, and a conventionally known cell cross-sectional square shape and cell cross-sectional triangular shape can be used. Of course, a cell cross-sectional hexagonal shape may be used. Hereinafter, the ceramic honeycomb structure having a hexagonal cell cross section used in the present invention will be described.
【００１４】図２は本発明で使用するセル断面六角形状
のセラミックハニカム構造体の一例の構成を示す図であ
る。図２では、円筒形状のセラミックハニカム構造体３
１のセル断面の１／４の部分のみ示しており、セラミッ
クハニカム構造体３１は、隔壁３２により構成された多
数の六角形状のセル３３と、その外周部に設けた外周壁
３４とから構成されている。また、使用するセラミック
スの材質についても、従来から排ガス浄化器のハニカム
構造体として使用されているコージェライト、ムライ
ト、ＳｉＣ等を使用することができる。FIG. 2 is a diagram showing a configuration of an example of a ceramic honeycomb structure having a hexagonal cell cross section used in the present invention. In FIG. 2, a cylindrical ceramic honeycomb structure 3 is shown.
1 shows only a quarter of the cell cross section, and the ceramic honeycomb structure 31 is composed of a number of hexagonal cells 33 formed by partition walls 32 and an outer peripheral wall 34 provided on the outer peripheral portion thereof. ing. As for the ceramic material used, cordierite, mullite, SiC, etc. which have been conventionally used as a honeycomb structure of an exhaust gas purifier can be used.
【００１５】以下、実際の例について説明する。実施例１ 実際に、本発明で使用するセル断面六角形状のセラミッ
クハニカム構造体と、従来から知られているセル断面四
角形状や三角形状のセラミックハニカム構造体とを、高
速高負荷台上試験での耐熱衝撃性、台上試験での暖機完
了後のＨＣ浄化率、およびハニカム構造体をキャンニン
グして排ガス浄化器を構成する際に必要となるアイソス
タティック強度の点で比較した。なお、セラミックスの
材料としては、両者ともコージェライトを使用し、直径
等の寸法も直径：１０１．６ｍｍ、長さ：１０１．６ｍ
ｍ（容量：８２０ｃｃ）、隔壁３２の厚さが０．１７ｍ
ｍ、セル３３の密度が１平方センチメートル当たり６２
個、外周壁３４の厚さが０．４ｍｍである。尚、暖機完
了後のＨＣ浄化率測定には、他のセル密度のものを使用
した。Hereinafter, an actual example will be described. Example 1 In practice, a hexagonal cell-shaped ceramic honeycomb structure used in the present invention and a conventionally known cell-shaped rectangular or triangular-shaped ceramic honeycomb structure used in the present invention were subjected to a high-speed, high-load bench test. Were compared in terms of thermal shock resistance, HC purification rate after completion of warm-up in a bench test, and isostatic strength required when constructing an exhaust gas purifier by canning a honeycomb structure. Note that cordierite was used as the ceramic material, and the dimensions such as the diameter were 101.6 mm in diameter and 101.6 m in length.
m (capacity: 820 cc), and the thickness of the partition 32 is 0.17 m
m, the density of the cells 33 is 62 per square centimeter.
The thickness of the outer peripheral wall 34 is 0.4 mm. In addition, the thing of another cell density was used for the HC purification rate measurement after the completion of warm-up.
【００１６】また、高速高負荷台上試験での耐熱衝撃
性、および台上試験での暖機完了後のＨＣ浄化率では、
上記セラミックハニカム構造体に触媒を担持させた担体
として試験を行った。The thermal shock resistance in the high-speed high-load bench test and the HC purification rate after the completion of warm-up in the bench test are as follows:
A test was carried out as a carrier in which a catalyst was supported on the ceramic honeycomb structure.
【００１７】なお、高速高負荷台上試験での耐熱衝撃性
の測定は、Ｖ６、３リットルのエンジンを用いて５００
０ｒｐｍで負荷を変えて、触媒にクラックが発生する入
口排ガス温度を測定した。また、台上試験での暖機完了
後のＨＣ浄化率の測定は、Ｖ６、３リットルのエンジン
を用いて図３で示す走行パターンで走行した時、BagBで
のＨＣ浄化率を測定した。アイソスタティック強度は、
ハニカム構造体の上下端面に、ハニカム構造体と同一の
セル断面形状の厚さ約０．５ｍｍのウレタンシートを介
して、２０ｍｍのアルミニウム板を当て、さらに側面を
厚さ約０．５ｍｍのウレタンチューブで包み密封し、水
を満たした圧力容器に入れ、圧力を徐々に上げて破壊音
が生じたときの圧力を測定した。The thermal shock resistance in the high-speed, high-load bench test was measured using a V6, 3 liter engine.
The load was changed at 0 rpm, and the temperature of the exhaust gas at the inlet where cracks occurred in the catalyst was measured. The HC purification rate after the completion of warm-up in the bench test was determined by measuring the HC purification rate in BagB when the vehicle traveled in the traveling pattern shown in FIG. 3 using a V6, 3 liter engine. Isostatic strength
A 20 mm aluminum plate is applied to the upper and lower end surfaces of the honeycomb structure via a urethane sheet having the same cell cross-sectional shape as the honeycomb structure and having a thickness of about 0.5 mm, and a urethane tube having a thickness of about 0.5 mm on the side surface And sealed in a pressure vessel filled with water, and the pressure was gradually increased to measure the pressure when a breaking sound was generated.
【００１８】高速高負荷台上試験での測定結果を図４に
示す。図４の結果から、セル断面六角形状のセラミック
ハニカム構造体の方がセル断面四角形状または三角形状
のセラミックハニカム構造体よりも耐熱衝撃性が高いこ
とがわかった。マニホールド直下ではエンジンの設定条
件によっては触媒コンバータ入口排ガス温度が最高９０
０℃以上に達する可能性があるため、図４の結果からマ
ニホールド直下で使用可能なのはセル断面六角形状のセ
ラミックハニカム構造体のみであることがわかる。ま
た、台上試験での暖機完了後のＨＣ浄化率の測定結果を
図５に示す。図５の結果から、触媒が完全に昇温した後
のＨＣ浄化率は、セル断面三角形状または四角形状のセ
ラミックハニカム構造体の方がセル断面六角形状のセラ
ミックハニカム構造体より高いことがわかった。そのた
め、エンジンから離れている熱衝撃の小さい第２の浄化
器にはセル断面三角形状または四角形状のセラミックハ
ニカム構造体が適することがわかる。さらに、アイソス
タティック強度の測定結果を以下の表１に示す。FIG. 4 shows the measurement results of the high-speed high-load bench test. From the results of FIG. 4, it was found that the ceramic honeycomb structure having a hexagonal cell cross section had higher thermal shock resistance than the ceramic honeycomb structure having a quadrangular or triangular cell cross section. Immediately below the manifold, the exhaust gas temperature at the catalytic converter inlet may be up to 90 depending on the engine setting conditions.
Since the temperature can reach 0 ° C. or higher, it can be seen from the results of FIG. 4 that only the ceramic honeycomb structure having a hexagonal cell cross section can be used immediately below the manifold. FIG. 5 shows the measurement results of the HC purification rate after the completion of warm-up in the bench test. From the results in FIG. 5, it was found that the HC purification rate after the catalyst was completely heated was higher in the ceramic honeycomb structure having the triangular or quadrangular cell cross section than in the ceramic honeycomb structure having the hexagonal cell cross section. . Therefore, it can be seen that a ceramic honeycomb structure having a triangular or quadrangular cell cross section is suitable for the second purifier having a small thermal shock away from the engine. Further, the measurement results of the isostatic strength are shown in Table 1 below.
【００１９】[0019]
【表１】 [Table 1]
【００２０】表１の結果から、セル断面六角形状のセラ
ミックハニカム構造体は、セル断面四角形状または三角
形状のセラミックハニカム構造体と比較して、アイソス
タティック強度は若干劣るが、キャンニングするのに必
要な強度は１０ｋｇｆ／ｃｍ2 以上であれば良いので、
十分に使用できることがわかる。From the results in Table 1, it can be seen that the ceramic honeycomb structure having a hexagonal cell cross section has slightly lower isostatic strength than the ceramic honeycomb structure having a square or triangular cell cross section, but is not suitable for canning. The required strength should be 10 kgf / cm 2 or more.
It turns out that it can be used enough.
【００２１】以上の実施例１の結果から、セル断面六角
形状のセラミックハニカム構造体のアイソスタティック
強度は実用レベルでは問題はないもののセル断面四角形
状のセラミックハニカム構造体に比べて低くなっている
ため、セル断面六角形状のセラミックハニカム構造体に
おいてアイソスタティック強度を何らかの手段で高める
ことが望ましい。図６（ａ）〜（ｇ）は、それぞれアイ
ソスタティック強度を高めた本発明で使用するセル断面
六角形状のセラミックハニカム構造体の一例を示す図で
ある。From the results of Example 1 described above, although the isostatic strength of the ceramic honeycomb structure having a hexagonal cell cross section is not a problem on a practical level, it is lower than that of a ceramic honeycomb structure having a square cell cross section. It is desirable to increase the isostatic strength of the ceramic honeycomb structure having a hexagonal cell cross section by some means. FIGS. 6A to 6G are diagrams illustrating an example of a ceramic honeycomb structure having a hexagonal cross section of a cell used in the present invention with an increased isostatic strength.
【００２２】図６（ａ）に示す例では、外周部の隔壁３
２の厚さを厚くしてセラミックハニカム構造体３１を形
成している。図６（ｂ）に示す例では、外周部の不完全
セル３５をセラミック材料で目封じしてセラミックハニ
カム構造体３１を形成している。ここで、不完全セル３
５とは完全セル３３に対する意味、すなわちセルが六角
形状でない形状であることを意味し、好ましくは面積が
完全セル３３の面積の９０％未満のものを不完全セル３
５としている。In the example shown in FIG.
The ceramic honeycomb structure 31 is formed by increasing the thickness of the ceramic honeycomb structure 2. In the example shown in FIG. 6B, the ceramic honeycomb structure 31 is formed by plugging the incomplete cells 35 in the outer peripheral portion with a ceramic material. Here, incomplete cell 3
5 means the complete cell 33, that is, the cell has a non-hexagonal shape, and preferably has an area of less than 90% of the area of the complete cell 33.
5 is assumed.
【００２３】図６（ｃ）〜（ｅ）に示す例では、それぞ
れ外周部のセル３３の形状のみをセル断面四角形状とし
てセラミックハニカム構造体３１を形成している。すな
わち、図６（ｃ）に示す例では、外周部のセル３３を一
様にセル断面四角形状とするとともに、図６（ｄ）、
（ｅ）に示す例では、外周部のセル３３を図６（ｃ）に
示す例よりもセル密度が高いセル断面四角形状としてい
る。図６（ｆ）、（ｇ）に示す例では、それぞれ外周部
のセル３３に補強リブ３６を形成してセラミックハニカ
ム構造体３１を形成している。図６（ｃ）〜（ｇ）のい
ずれの例でも、破壊が外周部で発生するため、外周部を
補強することでアイソスタティック強度を高めている。In the examples shown in FIGS. 6 (c) to 6 (e), the ceramic honeycomb structure 31 is formed by making only the shape of the cell 33 in the outer peripheral portion into a rectangular cell cross section. That is, in the example shown in FIG. 6 (c), the cells 33 in the outer peripheral portion are uniformly made to have a square cell cross section, and
In the example shown in (e), the cells 33 in the outer peripheral portion have a rectangular cell cross section having a higher cell density than the example shown in FIG. 6 (c). In the examples shown in FIGS. 6F and 6G, the reinforcing ribs 36 are formed on the cells 33 on the outer peripheral portion, respectively, to form the ceramic honeycomb structure 31. In each of the examples shown in FIGS. 6C to 6G, since breakage occurs at the outer peripheral portion, the isostatic strength is increased by reinforcing the outer peripheral portion.
【００２４】実施例２ 図６（ａ）〜（ｇ）に示した外周部補強のセル断面六角
形状のセラミックハニカム構造体の特性を調べるため、
図６（ａ）〜（ｇ）に示すセラミックハニカム構造体に
ついて実施例１と同様に高速高負荷台上試験での耐熱衝
撃性、台上試験での暖機完了後のＨＣ浄化率、およびハ
ニカム構造体をキャンニングして排ガス浄化器を構成す
る際に必要となるアイソスタティック強度を測定し、外
周部の補強のないセル断面六角形状のセラミックハニカ
ム構造体の特性と比較した。セル構造等は以下の表２に
示す通りであった。結果を表２に示す。 Example 2 In order to examine the characteristics of the ceramic honeycomb structure having a hexagonal cell cross section for reinforcing the outer periphery shown in FIGS. 6 (a) to 6 (g),
6A to 6G, the thermal shock resistance in the high-speed and high-load bench test, the HC purification rate after the completion of the warm-up in the bench test, and the honeycomb, as in Example 1. The isostatic strength required when constructing an exhaust gas purifier by canning the structure was measured and compared with the characteristics of a ceramic honeycomb structure having a hexagonal cell cross section without reinforcement on the outer periphery. The cell structure and the like were as shown in Table 2 below. Table 2 shows the results.
【００２５】[0025]
【表２】 [Table 2]
【００２６】表２の結果から、外周部を補強した本発明
品２〜８は、外周部を補強しなかった本発明品１と比較
して、１．５〜２倍のアイソスタティック強度が得られ
ることがわかった。一方、高速高負荷試験による熱衝撃
評価の結果、本発明品２〜８は本発明品１とほぼ同等で
あった。また、浄化効率測定の結果も、本発明品２〜８
は本発明品１とほぼ同等であった。From the results shown in Table 2, the products 2 to 8 of the present invention in which the outer peripheral portion is reinforced have 1.5 to 2 times the isostatic strength as compared with the product 1 of the present invention in which the outer peripheral portion is not reinforced. I knew it could be done. On the other hand, as a result of the thermal shock evaluation by the high-speed high-load test, the products 2 to 8 of the present invention were almost equivalent to the product 1 of the present invention. In addition, the results of the purification efficiency measurement were also the results of the present invention products 2 to 8
Was almost equivalent to the product 1 of the present invention.
【００２７】実施例３ 図２に示す形状の断面六角形状のセラミックハニカム構
造体を第１の浄化器に搭載して、エンジン近傍に設置す
る効果を確認した。すなわち、高速高負荷試験での結果
（図４）をもとに、以下の表３に示すように各セル構造
においてセラミックハニカム構造体が熱衝撃によって破
壊しない位置に第１の浄化器を設置し、また第２の浄化
器には全て同一の断面四角形状のセラミックハニカム構
造体を搭載して、浄化効率を台上試験にて測定した。な
お、第１の浄化器および第２の浄化器の寸法、セル密度
等はともに実施例１と同様とした。また、台上試験は、
走行モードのみ図３のBagAで測定する以外実施例１と同
様に行った。 Example 3 The effect of installing a ceramic honeycomb structure having a hexagonal cross section shown in FIG. 2 on a first purifier and installing it near an engine was confirmed. That is, based on the results of the high-speed and high-load test (FIG. 4), as shown in Table 3 below, the first purifier was installed at a position where the ceramic honeycomb structure did not break due to thermal shock in each cell structure. In addition, all the second purifiers were equipped with the same ceramic honeycomb structure having a square cross section, and the purification efficiency was measured by a bench test. The dimensions, cell density, and the like of the first and second purifiers were the same as in Example 1. In addition, bench test,
The same operation as in Example 1 was performed except for the measurement in BagA of FIG.
【００２８】[0028]
【表３】 [Table 3]
【００２９】結果を図７に示す。図７の結果から、断面
六角形状のセラミックハニカム構造体はその他の例に比
べて触媒が速く昇温し活性化するので、浄化効率が高
く、設置位置をエンジンに近くした効果が確認された。FIG. 7 shows the results. The results in FIG. 7 confirm that the ceramic honeycomb structure having a hexagonal cross section has a higher purification efficiency because the catalyst is heated and activated faster than the other examples, so that the effect of setting the installation position close to the engine was confirmed.
【００３０】[0030]
【発明の効果】以上の説明から明らかなように、本発明
によれば、第１の浄化器として耐熱衝撃性の良好なセル
断面六角形状のセラミックハニカム構造体を少なくとも
１つ使用しているため、第１の浄化器をエンジン出口近
傍の排ガス温度の高い位置に設置できる。その結果、ハ
ニカム構造体に高温の排ガスがあたることになるため、
ハニカム構造体を速やかに高温とでき、触媒の活性化を
速やかに達成できる。As is apparent from the above description, according to the present invention, at least one ceramic honeycomb structure having a hexagonal cell cross section having good thermal shock resistance is used as the first purifier. The first purifier can be installed at a position near the engine outlet where the exhaust gas temperature is high. As a result, high-temperature exhaust gas hits the honeycomb structure,
The temperature of the honeycomb structure can be quickly raised, and the activation of the catalyst can be quickly achieved.
【図１】本発明の排ガス浄化装置の一実施例を適用した
自動車用エンジンの排ガス流通部分の一例を示す図であ
る。FIG. 1 is a diagram showing an example of an exhaust gas distribution portion of an automobile engine to which an embodiment of the exhaust gas purifying apparatus of the present invention is applied.
【図２】本発明で使用するセル断面六角形状のセラミッ
クハニカム構造体の一例の構成を示す図である。FIG. 2 is a diagram showing a configuration of an example of a ceramic honeycomb structure having a hexagonal cell cross section used in the present invention.
【図３】実施例で使用した台上試験での走行パターンを
示すグラフである。FIG. 3 is a graph showing a running pattern in a bench test used in Examples.
【図４】高速高負荷台上試験での耐熱衝撃性の測定結果
を示すグラフである。FIG. 4 is a graph showing measurement results of thermal shock resistance in a high-speed high-load bench test.
【図５】台上試験での暖機完了後のＨＣ浄化率の測定結
果を示すグラフである。FIG. 5 is a graph showing a measurement result of an HC purification rate after completion of warm-up in a bench test.
【図６】アイソスタティック強度を高めた本発明で使用
するセル断面六角形状のセラミックハニカム構造体の一
例を示す図である。FIG. 6 is a view showing an example of a ceramic honeycomb structure having a hexagonal cell cross section used in the present invention with increased isostatic strength.
【図７】台上試験での暖機完了後のＨＣ浄化率の測定結
果を示すグラフである。FIG. 7 is a graph showing a measurement result of an HC purification rate after completion of warm-up in a bench test.
１ エンジン本体、２ 排気マニホールド、１０ 排ガ
ス浄化装置、１６ 第１の排ガス浄化器、１７ 第２の
排ガス浄化器DESCRIPTION OF SYMBOLS 1 Engine main body, 2 Exhaust manifold, 10 Exhaust gas purifier, 16 First exhaust gas purifier, 17 Second exhaust gas purifier
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大原 悦二 愛知県名古屋市瑞穂区須田町２番56号 日本碍子株式会社内 (56)参考文献 特開 昭62−182855（ＪＰ，Ａ) 特開 平６−170241（ＪＰ，Ａ) 実開 昭48−65910（ＪＰ，Ｕ) 実開 平２−108731（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F01N 3/20 - 3/28 B01D 53/86 B01J 35/04 301 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Etsuji Ohara 2-56 Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Insulator Co., Ltd. (56) References JP-A-62-182855 (JP, A) 6-170241 (JP, A) Japanese Utility Model Showa 48-65910 (JP, U) Japanese Utility Model Application 2-108731 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F01N 3/20 -3/28 B01D 53/86 B01J 35/04 301
Claims (5)
下流に向けて、順に配設される第１の排ガス浄化器、第
２の排ガス浄化器を少なくとも有する排ガス浄化装置に
おいて、前記第１の排ガス浄化器に少なくとも１つのセ
ル断面六角形状のセラミックハニカム構造体を搭載し、
このセル断面六角形状のセラミックハニカム構造体の外
周部の隔壁の厚さを中心部の厚さより厚くしたことを特
徴とする排ガス浄化装置。1. An exhaust gas purifying apparatus having at least a first exhaust gas purifier and a second exhaust gas purifier arranged in order from an exhaust gas outlet of an internal combustion engine to a downstream of an exhaust gas flow, wherein The exhaust gas purifier is equipped with at least one ceramic honeycomb structure having a hexagonal cell cross section,
An exhaust gas purifying apparatus characterized in that the thickness of the partition walls at the outer peripheral portion of the ceramic honeycomb structure having a hexagonal cell cross section is larger than the thickness at the central portion.
下流に向けて、順に配設される第１の排ガス浄化器、第
２の排ガス浄化器を少なくとも有する排ガス浄化装置に
おいて、前記第１の排ガス浄化器に少なくとも１つのセ
ル断面六角形状のセラミックハニカム構造体を搭載し、
このセル断面六角形状のセラミックハニカム構造体の外
周部のセルに補強リブを形成したことを特徴とする排ガ
ス浄化装置。2. An exhaust gas purifying apparatus having at least a first exhaust gas purifier and a second exhaust gas purifier arranged in order from an exhaust gas outlet of an internal combustion engine to a downstream of an exhaust gas flow, wherein The exhaust gas purifier is equipped with at least one ceramic honeycomb structure having a hexagonal cell cross section,
An exhaust gas purifying apparatus characterized in that reinforcing ribs are formed in cells on the outer peripheral portion of the ceramic honeycomb structure having a hexagonal cell cross section.
最高温度が９００℃以上である請求項１または２記載の
排ガス浄化装置。Wherein said first exhaust gas purification device according to claim 1 or 2, wherein the maximum temperature of the inlet exhaust gas is 900 ° C. In the above exhaust gas purifier.
形状または三角形状のセラミックハニカム構造体である
請求項１〜３のいずれか１項に記載の排ガス浄化装置。Wherein said second exhaust converter has an exhaust gas purifying apparatus according to any one of claims 1 to 3-cell is a sectional square shape or triangular shape of the ceramic honeycomb structure.
流側に、さらに１つまたは２つ以上の複数の排ガス浄化
器を配設した請求項１〜４のいずれか１項に記載の排ガ
ス装置。5. A downstream side of the second exhaust gas purifier of the exhaust gas flow, according to any one of claims 1 to 4, further were provided with one or more of the plurality of exhaust converter Exhaust gas device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36018798A JP3229595B2 (en) | 1998-12-18 | 1998-12-18 | Exhaust gas purification equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36018798A JP3229595B2 (en) | 1998-12-18 | 1998-12-18 | Exhaust gas purification equipment |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07003911A Division JP3093598B2 (en) | 1995-01-13 | 1995-01-13 | Exhaust gas purification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11270334A JPH11270334A (en) | 1999-10-05 |
| JP3229595B2 true JP3229595B2 (en) | 2001-11-19 |
Family
ID=18468291
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36018798A Expired - Lifetime JP3229595B2 (en) | 1998-12-18 | 1998-12-18 | Exhaust gas purification equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4788497B2 (en) | 2005-12-27 | 2011-10-05 | 株式会社デンソー | Hex honeycomb structure |
| JP2008018370A (en) * | 2006-07-14 | 2008-01-31 | Denso Corp | Ceramic catalyst body |
| JP5816010B2 (en) * | 2011-07-12 | 2015-11-17 | 住友化学株式会社 | Honeycomb structure |
| JP2013017968A (en) * | 2011-07-12 | 2013-01-31 | Sumitomo Chemical Co Ltd | Honeycomb structure |
| JP5851745B2 (en) * | 2011-07-12 | 2016-02-03 | 住友化学株式会社 | Honeycomb structure |
| JP5892910B2 (en) | 2012-01-27 | 2016-03-23 | 株式会社デンソー | Honeycomb structure |
| JP2013212493A (en) * | 2012-03-30 | 2013-10-17 | Ngk Insulators Ltd | Honeycomb structure |
| US9663408B2 (en) | 2013-09-26 | 2017-05-30 | Ngk Insulators, Ltd. | Honeycomb structure |
| JP6385295B2 (en) | 2015-02-25 | 2018-09-05 | 日本碍子株式会社 | Honeycomb structure |
| JP6595773B2 (en) | 2015-02-25 | 2019-10-23 | 日本碍子株式会社 | Honeycomb structure |
| EP3381546A1 (en) * | 2017-03-29 | 2018-10-03 | Vito NV | Devices for through-flow of fluids comprising graded porous structures |
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1998
- 1998-12-18 JP JP36018798A patent/JP3229595B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JPH11270334A (en) | 1999-10-05 |
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