JPS595821A - Regenerating procedure of gas permeable heat resistant member to be provided in exhaust gas passage - Google Patents
Regenerating procedure of gas permeable heat resistant member to be provided in exhaust gas passageInfo
- Publication number
- JPS595821A JPS595821A JP57114746A JP11474682A JPS595821A JP S595821 A JPS595821 A JP S595821A JP 57114746 A JP57114746 A JP 57114746A JP 11474682 A JP11474682 A JP 11474682A JP S595821 A JPS595821 A JP S595821A
- Authority
- JP
- Japan
- Prior art keywords
- resistant member
- carbon particles
- exhaust gas
- heat resistant
- oxygen concentration
- 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.)
- Granted
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
- F01N3/02—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
- F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は排ガス通路内に設けられる通気性耐熱部材の再
生法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for regenerating a breathable heat-resistant member provided in an exhaust gas passage.
ディーゼルエンジン等の内燃機関から排出される排ガス
中には多量のカーボン微粒子が含まれているため、公害
対策上から排ガス通路内にはセラミック多孔体、セラミ
ックハニカムフィルター類、セラミックファイバー、金
属繊維や発泡状金属体等の通気性耐熱部材を設けたカー
ボン浄化装置が使用されているが、この種カーボン浄化
装置は通気性耐熱部材に捕集されたカーボン微粒子を除
去して再生しなければならない。七ころが通気性耐熱部
材の再生を雲量＃潅噂１加熱気体の強制送給によシ行う
場合、加熱気体の濃度をカーボン着火濃度よシ若干高い
ｔｏｏ’ｃ前後としても、カーボン微粒子が急激に燃焼
して通気性耐熱部材が１０００℃以上、条件によっては
／ ＩＡＯＯ°Ｃ以上にな夛、通気性耐熱部材に溶損や
破壊が生ずる。このため上記通気性耐熱部材の昇温が、
燃焼カーボン微粒子鰍と関係することに着目して通気性
耐熱部材へのカーボン微粒子堆積量が少ないうちに燃焼
除去する試みもなされているが、この場合は燃焼再生回
数が増すため、相対的に燃焼用エネルギーの多消費とな
るうえに頻繁に再生のための燃焼を繰返すと通気性耐熱
部材の耐久性に問題が生じ、また、カーボン微粒子の堆
積量を多くできないため、カーボン微粒子発生量の多い
排ガス系への適用が困難となる等の欠点を有している。The exhaust gas emitted from internal combustion engines such as diesel engines contains a large amount of carbon particles, so in order to prevent pollution, ceramic porous bodies, ceramic honeycomb filters, ceramic fibers, metal fibers, and foamed materials are used in the exhaust gas passage. A carbon purification device equipped with a breathable heat-resistant member such as a shaped metal body is used, but in this type of carbon purification device, the carbon fine particles collected on the breathable heat-resistant member must be removed and regenerated. When seven rollers regenerate breathable heat-resistant members by forcedly feeding heated gas, even if the concentration of the heated gas is around too'c, which is slightly higher than the carbon ignition concentration, carbon particles will rapidly increase. If the air-permeable heat-resistant member burns to a temperature of 1000°C or higher, and depending on the conditions, the air-permeable heat-resistant member reaches a temperature of 1000°C or higher, it may melt or break. Therefore, the temperature increase of the above-mentioned breathable heat-resistant member is
Attempts have been made to burn and remove the amount of carbon particles deposited on breathable heat-resistant members by focusing on the relationship between combustion and carbon particles. In addition to consuming a large amount of energy, frequent repetition of combustion for regeneration will cause problems with the durability of breathable heat-resistant members.Also, since it is not possible to increase the amount of carbon particles deposited, exhaust gas that generates a large amount of carbon particles It has drawbacks such as difficulty in applying it to systems.
本発明は前記のような欠点を解消する目的の下に完成さ
れた排ガス通路内に設けられる通気性耐熱部材の再生法
に関するもので、排ガス通路内に設けられて排ガス中の
カーボン微粒子が捕集さ・れた通気性耐熱部材にカーボ
ン燃焼用の加熱気体を、流量（Ｎ’！％ｎ ｉ ｎ）を
ｙ軸、酸素濃度（Ｖｏ１％＞ｋＸ軸としてグラフ化した
とき、ｙ＝ ／、 ／ ２−０．２ ｑＯｌｏｇ６Ｘお
よびｙ ＝ ０． 、！； ３．２−Ｃ２２り］ｏｇｅ
Ｘの各曲線とｙ＝Ｏ／、ニー０５、ｘ−２／の各直線で
囲まれる領域にある流量および酸素濃度に制御して強制
的に送給してカーボン微粒子を燃焼除去することを特徴
とするものである。The present invention relates to a method for regenerating a breathable heat-resistant member installed in an exhaust gas passage, which has been completed with the aim of eliminating the above-mentioned drawbacks. When graphing the heated gas for carbon combustion in the air-permeable heat-resistant member with the flow rate (N'!%n in) on the y-axis and the oxygen concentration (Vo1%>kX-axis), y= /, / 2-0.2 qOlog6X and y = 0.,!; 3.2-C22ri]oge
It is characterized by burning and removing carbon particles by controlling and forcibly feeding the flow rate and oxygen concentration in the area surrounded by each curve of X and each straight line of y=O/, knee 05, and x-2/. That is.
本発明において使用される通気性耐熱部材は自動車や船
のディーゼルエンジン等の内燃機関の排ガス通路内に設
けられてカーボン微粒子を捕集するセラミック多孔体、
セラミックハニカムフィルター、セラミックファイバー
等のセラミック類や金属繊維等の耐熱金属類よりなるも
のであればよいが、この通気性耐熱部材には排ガス中の
カーボン微粒子が捕集されるので、カーボン微粒子が所
定量捕集されると、排ガス通路中の排ガスの流れを分岐
路側に切換えて一時的にカーボン微粒子の捕集されてい
る通気性耐熱部材への流れｔ−遮断し、この通気性耐熱
部材に捕集されたカーボン微粒子を短時間のうちに除去
して通気性耐熱部材を再生する必要が生ずる。しかして
、このカーボン微粒子の除去は排ガス通路の入口側に設
けた加熱装置によりカーボン微粒子の着火温度以上に加
熱されて強制的に送給されるカーボン燃焼用の加熱゛気
体をもって行うこととなるが、カーボン微粒子の着火温
度以上に加熱されたこの加熱気体の送給によって該カー
ボン微粒子の燃焼を行うと、通常は前記加熱気体の温度
を通気性耐熱部材の溶融温度よシ遥か普く設定しておい
た場合でもカーボン微粒子の燃焼炎によって通気性耐熱
部材が異常高温化し、通気性耐熱部材の破損流度や溶損
温度に達するおそれがある。そこで、本発明はカーボン
微粒子の燃焼に伴う温度上昇が加熱気体、の流量および
酸素濃度と密接な関係にあることに着目し、加熱気体の
流量および酸素濃度を制御することによりカーボン微粒
子が燃焼しても通気性耐熱部材内の最高到達温度を該通
気性耐熱部材の破損或いは溶損温度以下に保持するよう
にしたものであるＯすなわち、カーボン燃焼用の加熱気
体を、流量（Ｎ′″／ｒｎｉｎ ）をｙ軸、酸素濃度（
ＶＯｅ％）をｙ軸としてグラフ化したとき、ｙ＝／、／
、２−Ｃ２ｑ（：ｌｌＯｇｅＸおよびｙ＝０．！；３
２−０．２２９１ｏｇ６Ｘの各曲線とｙ＝ ０． ／、
Ｘ ＝ ０． ！；、ｘ−２７の各直線で囲まれる領域
にある流量および酸素濃度に制御して強制的に送給する
ことによりカーボン微粒子が燃焼しても通気性耐熱部材
の内部温度を約ｑＳＯ″Ｃ以下に保持させることができ
るようにした点に特長がある。以下、本発明を図示のセ
ラミツクツ１ニカムフイルターを通気性耐熱部材として
使用した実施例について説明する。The breathable heat-resistant member used in the present invention is a ceramic porous body that is installed in the exhaust gas passage of an internal combustion engine such as a diesel engine of an automobile or a ship to collect carbon particles.
Any filter made of ceramics such as ceramic honeycomb filters or ceramic fibers or heat-resistant metals such as metal fibers may be used, but since this breathable heat-resistant member collects carbon particles in the exhaust gas, the carbon particles may Once a certain amount of carbon particles has been collected, the flow of the exhaust gas in the exhaust gas passage is switched to the branch path side to temporarily cut off the flow to the breathable heat-resistant member where the carbon particles are collected, and the carbon particles are captured in the breathable heat-resistant member. It becomes necessary to remove the collected carbon fine particles within a short time and regenerate the breathable heat-resistant member. However, the removal of these carbon particles is carried out using a heated gas for carbon combustion that is heated to a temperature higher than the ignition temperature of the carbon particles by a heating device installed on the inlet side of the exhaust gas passage and is forcibly fed. When the carbon particles are combusted by supplying the heated gas heated above the ignition temperature of the carbon particles, the temperature of the heated gas is usually set to be much higher than the melting temperature of the breathable heat-resistant member. Even if the carbon particles are left in place, the combustion flame of the carbon particles may cause the air-permeable heat-resistant member to reach an abnormally high temperature, which may reach the failure flow rate or melting temperature of the air-permeable heat-resistant member. Therefore, the present invention focuses on the fact that the temperature rise accompanying the combustion of carbon particles is closely related to the flow rate and oxygen concentration of heated gas, and by controlling the flow rate and oxygen concentration of heated gas, carbon particles are combusted. The maximum temperature within the breathable heat-resistant member is kept below the breakage or melting temperature of the breathable heat-resistant member. rnin ) on the y axis, oxygen concentration (
When graphed with VOe%) as the y axis, y=/,/
,2-C2q(:llOgeX and y=0.!;3
2-0.2291og6X each curve and y=0. /,
X = 0. ! By controlling and forcibly feeding the flow rate and oxygen concentration within the area surrounded by the straight lines of The present invention is advantageous in that it can be held as a heat-resistant member.Hereinafter, an embodiment of the present invention will be described in which the illustrated ceramic 1-nicam filter is used as an air-permeable heat-resistant member.
（１）はコージェライト、ムライト等の多孔質セラミッ
ク材料よシなるフィルタ一本体で、該フィルタ一本体（
１）に多数ハニカム状に配設されている孔は一端を閉塞
部（３ａ）とした孔（，２Ｂ）と他端を閉塞部（３ｔＯ
とした孔（２ｂ）とよ多なり、孔（，２ａ） 、（２ｂ
）は交互に配列されて名花（，２Ｂ） 、Ｃ２ｂ）の各
隔壁（４）が濾過層を形成している。そして、このセラ
ミックハニカムフィルターは直径ｌ／ざｎ１長さ／！；
２１１Ｍ。(1) is a filter body made of porous ceramic material such as cordierite or mullite;
A large number of holes arranged in a honeycomb shape in 1) have one end as a closed part (3a) and the other end as a closed part (3tO).
The holes (2b) and the holes (2a) and (2b
) are arranged alternately, and the partition walls (4) of Meika (, 2B) and C2b) form a filtration layer. And this ceramic honeycomb filter has a diameter of l/a length of n1/! ;
211M.
隔壁厚０３０Ｍ１１、孔の密度３２〜、一端からみた開
口率３ Ｉｌ、！；％のもので、排ガス通路（５）内に
取付けられ、該排ガス通路（５）のガス入口側にけ内燃
機関への配管よシ分岐させて図示しない加熱気体供給装
置が設けられている。このような排ガス通路（５）にお
いて、通気性耐熱部材としてのセラミックハニカムフィ
ルターに捕集されたカーボン微粒子を第１表に示す条件
で加熱気体の強制的な送給による燃焼除去を行った再生
テス）ｌ示せば下表のとおシである。Partition wall thickness 030M11, hole density 32~, open area ratio seen from one end 3 Il,! %, and is installed in the exhaust gas passage (5), and a heated gas supply device (not shown) is provided on the gas inlet side of the exhaust gas passage (5), branching off from the piping to the internal combustion engine. In this exhaust gas passage (5), a regeneration test was carried out in which the carbon particles collected by the ceramic honeycomb filter as a breathable heat-resistant member were burned and removed by forcibly feeding heated gas under the conditions shown in Table 1. ) If shown, it is as shown in the table below.
第１表
上表において通気性耐熱部材に破損や溶損なく３分間で
４’Ｊ−％以上の再生効率をもって再生できた場合をグ
ラフに示せば第３図のとおりであって、強制的に送給さ
れる加熱気体の流量および酸素濃度を前記した範囲内に
制御すれば、通気性耐熱部材の破損や溶損なく効率的に
再生を行えることがこの表により確認できる。なお、カ
ーボン微粒子の燃焼開始温度は通気性耐熱部材に触媒が
用いられているかどうかによって異なるが、触媒がない
場合は通常夕ｊＯ°Ｃ前後であるため、加熱気体温度と
しては約５！０°Ｃ以上となる。しかしながら、乙ｓｏ
’ｃを越えると流量および酸素濃度の制御範囲が小さく
なシ、このためには制御装置が複雑となるばかりでなく
、このような装置を自走用のエンジンに設けることは経
済的でなく、さらに、乙ｊＯ″Ｃ以上に気体を加熱する
ことはエネルギー消費の観点から好ましくないので、カ
ーボン燃焼用の加熱気体の湿度は５！０°Ｃ〜乙夕Ｏ′
ｃが実用的である。In the above table of Table 1, if the air-permeable heat-resistant member can be regenerated with a regeneration efficiency of 4'J-% or more in 3 minutes without damage or erosion, the graph is shown in Figure 3. It can be confirmed from this table that if the flow rate and oxygen concentration of the heated gas to be supplied are controlled within the above-mentioned ranges, efficient regeneration can be performed without damage or melting loss of the breathable heat-resistant member. The combustion start temperature of carbon particles varies depending on whether or not a catalyst is used in the breathable heat-resistant member, but if there is no catalyst, it is usually around 70°C, so the heated gas temperature is approximately 5!0°C. It will be C or higher. However, so
If the flow rate and oxygen concentration exceed 'c, the control range for flow rate and oxygen concentration becomes small, which not only makes the control device complicated, but also makes it uneconomical to install such a device in a self-propelled engine. Furthermore, since it is not preferable from the viewpoint of energy consumption to heat the gas above 20°C, the humidity of the heated gas for carbon combustion is between 5!0°C and 20°C.
c is practical.
本発明は前記説明から明らかなように、カーボン微粒子
が捕集された排ガス通路内の通気性耐熱部材を再生する
に際し、カーボン微粒子燃焼用の加熱気体の流風および
酸素濃度を所定範囲に制限することにより急激な燃焼を
ｌｃ＜シたので、多量にカーボン微粒子を捕集した通気
性耐熱部材でも十分な再生効率を確保することができる
うえに再生時に通気性耐熱部材の溶損や破損が生ずるこ
とがなく、このため大幅に燃焼再生周期を長くすること
ができて燃焼再生のためのエネルギー効率や通気性耐熱
部材の耐久性の面における効果は極めて大きく、カーボ
ン微粒子の排出量の多い排気系への適用も拡大できるな
ど多くの利点を有する排ガス通路内に設けられる通気性
耐熱部材の再生法として産業の発展に寄与するところ極
めて大なものである。As is clear from the above description, the present invention is directed to limiting the flow and oxygen concentration of heated gas for carbon particulate combustion to a predetermined range when regenerating the breathable heat-resistant member in the exhaust gas passage where carbon particulates have been collected. Since rapid combustion is suppressed by lc<, sufficient regeneration efficiency can be ensured even with a breathable heat-resistant member that collects a large amount of carbon particles, and the heat-resistant breathable member will not be melted or damaged during regeneration. As a result, the combustion regeneration cycle can be significantly lengthened, which has an extremely large effect on the energy efficiency of combustion regeneration and the durability of breathable heat-resistant materials. This method is extremely useful in contributing to the development of industry as a method for recycling breathable heat-resistant members installed in exhaust gas passages, which has many advantages such as being able to expand its application.
第１図は本発明方法に使用される装置の要部を示す一部
切欠正面図、第２図は本発明方法に使用される通気性耐
熱部材としてのセラミックハニカムフィルターの縦断側
面図、第３図は本発明の実施例において得られた燃焼空
気の流量と酸素濃度との関係を示すグラフである０Fig. 1 is a partially cutaway front view showing the main parts of the device used in the method of the present invention, Fig. 2 is a vertical cross-sectional side view of a ceramic honeycomb filter as a breathable heat-resistant member used in the method of the present invention, The figure is a graph showing the relationship between the flow rate of combustion air and oxygen concentration obtained in an example of the present invention.
Claims (1)
捕集された通気性耐熱部材にカーボン燃焼用の加熱気体
を、流ｉｔ （”５’Ｆｎｉｎ）をｙ軸、酸素濃度αＯ
ｌ ％）をＸ軸としてグラフ化したとき、ｙ＝ ／、
／ ２ ０．．２ ｑＯ１ｏｇ８Ｘおよびｙ＝θｊ３
２−θ２２り１ｏｇ６Ｘの各曲線と７ ＝ ０． ／、
ｘ＝θｊ；、ｘ＝２１の各直線で囲まれる領域にある流
量および機素濃度に制御して強制的に送給してカーボン
微粒子を燃焼除去することを特徴とする排ガス通路内に
設けられる通気性耐熱部材の再生法。Heated gas for carbon combustion is applied to the breathable heat-resistant member provided in the exhaust gas passage to collect carbon particles in the exhaust gas.
When graphed with l%) as the X axis, y= /,
/ 2 0. ．． 2 qO1og8X and y=θj3
Each curve of 2-θ22 1og6X and 7 = 0. /,
x = θj;, x = 21, and is provided in an exhaust gas passage characterized by forcibly feeding carbon particles by controlling the flow rate and oxygen concentration to be in the area surrounded by the straight lines of x = 21. A method for recycling breathable heat-resistant materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57114746A JPS595821A (en) | 1982-07-01 | 1982-07-01 | Regenerating procedure of gas permeable heat resistant member to be provided in exhaust gas passage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57114746A JPS595821A (en) | 1982-07-01 | 1982-07-01 | Regenerating procedure of gas permeable heat resistant member to be provided in exhaust gas passage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS595821A true JPS595821A (en) | 1984-01-12 |
| JPH0375731B2 JPH0375731B2 (en) | 1991-12-03 |
Family
ID=14645625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57114746A Granted JPS595821A (en) | 1982-07-01 | 1982-07-01 | Regenerating procedure of gas permeable heat resistant member to be provided in exhaust gas passage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS595821A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62107210U (en) * | 1985-12-24 | 1987-07-09 | ||
| JP2005195003A (en) * | 2003-12-08 | 2005-07-21 | Nissan Motor Co Ltd | Exhaust purification equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5412029A (en) * | 1977-06-30 | 1979-01-29 | Texaco Development Corp | Smoke filter |
-
1982
- 1982-07-01 JP JP57114746A patent/JPS595821A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5412029A (en) * | 1977-06-30 | 1979-01-29 | Texaco Development Corp | Smoke filter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62107210U (en) * | 1985-12-24 | 1987-07-09 | ||
| JP2005195003A (en) * | 2003-12-08 | 2005-07-21 | Nissan Motor Co Ltd | Exhaust purification equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0375731B2 (en) | 1991-12-03 |
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