JPH01100309A - Diesel particulates collecting device - Google Patents
Diesel particulates collecting deviceInfo
- Publication number
- JPH01100309A JPH01100309A JP62257743A JP25774387A JPH01100309A JP H01100309 A JPH01100309 A JP H01100309A JP 62257743 A JP62257743 A JP 62257743A JP 25774387 A JP25774387 A JP 25774387A JP H01100309 A JPH01100309 A JP H01100309A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- main filter
- exhaust system
- auxiliary
- activated alumina
- 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
- 239000003054 catalyst Substances 0.000 claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 13
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 10
- 150000001342 alkaline earth metals Chemical class 0.000 claims abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 12
- 239000011247 coating layer Substances 0.000 abstract description 5
- 229910052878 cordierite Inorganic materials 0.000 abstract description 5
- 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 abstract description 5
- 231100000572 poisoning Toxicity 0.000 abstract description 4
- 230000000607 poisoning effect Effects 0.000 abstract description 4
- 229910052788 barium Inorganic materials 0.000 abstract 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 abstract 1
- -1 barium nirate Chemical class 0.000 abstract 1
- 231100000614 poison Toxicity 0.000 description 10
- 230000007096 poisonous effect Effects 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 239000011148 porous material Substances 0.000 description 7
- 230000008929 regeneration Effects 0.000 description 7
- 238000011069 regeneration method Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000010419 fine particle Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ディーゼルエンジンから排出されるカーボン
等の微粒子を捕集、除去するためのディーゼルパティキ
ュレート捕集装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a diesel particulate collection device for collecting and removing fine particles such as carbon discharged from a diesel engine.
ディーゼルエンジンの排出ガスには、カーボン等の微粒
子が含まれる。これを捕集するために、通常セラミック
材料からなるフィルタが用いられる。このフィルタは、
多孔質のハニカムフィルタや、３次元フオームフィルタ
が用いられ、補集された微粒子は定期的に燃焼すること
により除去され、フィルタが再生される。この燃焼を促
進して再生効率を向上するために、各種触媒を担持した
フィルタが用いられる。たとえば、卑金属酸化物触媒で
は、特開昭５８−４３２１４号、特開昭５９−８２９４
４号がある。また、白金族触媒では特開昭５５−２４５
９７号、銅および銀をメツキ被膜で形成したものとして
は実開昭６２−９８７１８号がある。Diesel engine exhaust gas contains fine particles such as carbon. A filter made of ceramic material is usually used to collect this. This filter is
A porous honeycomb filter or a three-dimensional foam filter is used, and the collected particulates are removed by periodic combustion and the filter is regenerated. In order to promote this combustion and improve regeneration efficiency, filters carrying various catalysts are used. For example, for base metal oxide catalysts, JP-A-58-43214, JP-A-59-8294
There is No. 4. In addition, for platinum group catalysts, JP-A-55-245
No. 97, and Japanese Utility Model Application Publication No. 62-98718 is one in which copper and silver are formed with a plating film.
また、特開昭５９−１５０９１８号に見られるように、
粒径の大きいカーボンを捕集するための圧損の小さい熱
触媒をフィルタの上流側に別途設け、再生時に粒径の大
きい粒子から燃焼させることにより、再生効率を向上さ
せる技術がある。Also, as seen in Japanese Patent Application Laid-Open No. 59-150918,
There is a technique to improve the regeneration efficiency by separately providing a thermal catalyst with a small pressure drop on the upstream side of the filter to collect carbon having large particle sizes, and burning the particles starting from the large particle size during regeneration.
上述した触媒を担持したフィルタによれば、微粒子を燃
焼、除去し易くなり、フィルタの再生性能が向上する。According to the filter supporting the above-mentioned catalyst, it becomes easier to burn and remove particulates, and the regeneration performance of the filter is improved.
しかしながら、ディーゼルエンジンの排気ガス中に含ま
れる亜硫酸（ＳＯ２）ガスや、エンジンオイルから混入
するＺ ｎ 、Ｃａ −、Ｐ ％Ｆｅ等によりフィルタ
中の触媒が被毒する。ハニカムフィルタの例では、大ガ
ス側の通路壁表面を数１０μｍの厚さで覆うため、運転
時間の経過とともに触媒性能が低下し、フィルタの再生
効率が低下する問題があった。However, the catalyst in the filter is poisoned by sulfurous acid (SO2) gas contained in the exhaust gas of a diesel engine and Zn, Ca-, P%Fe, etc. mixed in from the engine oil. In the example of a honeycomb filter, since the passage wall surface on the large gas side is covered with a thickness of several tens of micrometers, there is a problem that the catalyst performance deteriorates as the operating time passes, and the regeneration efficiency of the filter decreases.
したがって、本発明の目的は、フィルタに担持された触
媒の被毒を防止することにより、フィルタ再生効率の向
上を図ることにある。Therefore, an object of the present invention is to improve filter regeneration efficiency by preventing poisoning of the catalyst supported on the filter.
Ｃ問題点を解決するための手段〕
そこで、本発明のディーゼルパティキュレート捕集装置
は、アルカリ土類金属を担持した被毒物捕集用の補助フ
ィルタを上流側に設けたことを特徴とする。Means for Solving Problem C] Therefore, the diesel particulate collection device of the present invention is characterized in that an auxiliary filter for collecting poisonous substances carrying an alkaline earth metal is provided on the upstream side.
具体的には、本発明の構成は次の通りである。Specifically, the configuration of the present invention is as follows.
なお、−参考までに第１図における符号を付しである。Note that - for reference, the reference numerals in FIG. 1 are given.
本発明は、ディーゼルエンジンから排出される微粒子を
排気系（１４）中で捕集し除去するためのディーゼルパ
ティキュレート捕集装置（１０）である。この装置（１
０）は、微粒子を処理可能な触媒成分を担持した主フィ
ルタ（１６）を排気系（１４）の下流側に設け、主フィ
ルタ（１６）より圧力損失が少なくアルカリ土類金属を
担持した補助フィルタ（１８）を排気系（１４）の上流
側に設けたものである。The present invention is a diesel particulate collection device (10) for collecting and removing particulates discharged from a diesel engine in an exhaust system (14). This device (1
0) is provided with a main filter (16) carrying a catalyst component capable of treating fine particles on the downstream side of the exhaust system (14), and an auxiliary filter carrying alkaline earth metals with less pressure loss than the main filter (16). (18) is provided on the upstream side of the exhaust system (14).
上記の本発明の構成において、主フィルタ（］６）およ
び補助フィルタ（１８）は、多孔質ハニカム構造体、フ
オーム構造体を用いることができるやこれら構造体は、
コーディエライト質等の低熱膨張率で耐熱性を備えたセ
ラミック材料を用いることが望ましい。これら構造体の
表面には、活性アルミナ等の所定の細孔径を有するコー
ト層を形成してもよい。In the above configuration of the present invention, the main filter (6) and the auxiliary filter (18) can use a porous honeycomb structure or a foam structure.
It is desirable to use a ceramic material with a low coefficient of thermal expansion and heat resistance, such as cordierite. A coating layer of activated alumina or the like having a predetermined pore size may be formed on the surface of these structures.
上述した本発明のディーゼルパティキュレート捕集装置
（１０）によれば、排気系（１４）において主フィルタ
（１６）の上流側に設けた補助フィルタ（１８）にアル
カリ土類金属が担持しであるため、排気系（１４）を流
れる排気ガス中の被毒成分がアルカリ土類金属と反応し
て被毒成分を補助フィルタ中にトラップする。トラップ
された被毒成分は、補助フィルタ内に堆積され、一部が
高速走行時に分解、除去されるが、補助フィルタは、圧
力損失が少ないため、後処理の必要はない。According to the above-described diesel particulate collection device (10) of the present invention, alkaline earth metals are supported on the auxiliary filter (18) provided upstream of the main filter (16) in the exhaust system (14). Therefore, the poisonous components in the exhaust gas flowing through the exhaust system (14) react with the alkaline earth metal and trap the poisonous components in the auxiliary filter. The trapped poisonous components are deposited in the auxiliary filter, and some of them are decomposed and removed during high-speed running, but the auxiliary filter does not require post-treatment because the pressure loss is small.
また、アルカリ土類金属が担持される補助フィルタの圧
填は、主フィルタより小さいので、排気系（１４）の背
圧上昇がそれ程大きくなることがない。Further, since the pressure of the auxiliary filter carrying the alkaline earth metal is smaller than that of the main filter, the increase in back pressure in the exhaust system (14) does not become so large.
（第１実施例）
次に、第１図に基づき、本発明にかかるディーゼルパテ
ィキュレート捕集装置の実施例を説明する。(First Embodiment) Next, an embodiment of the diesel particulate collection device according to the present invention will be described based on FIG.
第１図は、ディーゼルパティキュレート捕集装置の概略
樽成図である。FIG. 1 is a schematic diagram of a diesel particulate collection device.
第１図に示すように、ディーゼルパティキュレート捕集
装置１０は、ディーゼルエンジン１２の排気系１４に設
けられる。この捕集装置１０は、パティキュレート捕集
用の主フィルタ１６と被毒物捕集用の補助フィルタ１８
からなる。As shown in FIG. 1, a diesel particulate collection device 10 is provided in an exhaust system 14 of a diesel engine 12. This collection device 10 includes a main filter 16 for collecting particulates and an auxiliary filter 18 for collecting poisonous substances.
Consisting of
主フィルタ１６は、コーディエライト質のハニカムフィ
ルタからなる。寸法は、直径１２０μｍ、長さ１２０ｔ
ｍ、平均細孔径２６．ｃｒｍ、気孔率５０％である。こ
のハニカムフィルタの通路壁表面には、活性アルミナコ
ート層が形成されている。この活性アルミナコート層は
、活性アルミナ粉末、アルミナゾル、硝酸アルミニウム
、蒸留水からなるスラリーを、たとえばエアーブローに
よって押し込むことにより形成される。The main filter 16 is made of a cordierite honeycomb filter. Dimensions: diameter 120μm, length 120t
m, average pore diameter 26. crm, porosity is 50%. An activated alumina coating layer is formed on the surface of the passage wall of this honeycomb filter. This activated alumina coat layer is formed by forcing a slurry consisting of activated alumina powder, alumina sol, aluminum nitrate, and distilled water, for example, by air blowing.
活性アルミナコート層が形成されたフィルタは、吸水処
理が行われ、０．６８ ｇ ／ １のＰｄＣ１ｚ水溶液
（２ｔｌ）中に浸漬され、フィルタ材を上下に揺動させ
つつ、Ｐｄを担持した。担持量は、フィルタ容積１ｉ！
当り１ｇであった。The filter on which the activated alumina coat layer was formed was subjected to water absorption treatment, and was immersed in a 0.68 g/1 PdC1z aqueous solution (2 tl) to support Pd while shaking the filter material up and down. The supported amount is the filter volume 1i!
It was 1g per serving.
補助フィルタ１８は、同じくコーディエライト質のハニ
カムフィルタからなる。寸法は、直径１２０ｍ、長さ１
２０ｎ、平均細孔径が約１５０μｍ、気孔率が６０％で
ある。そして、このハニカムフィルタの表面には、主フ
ィルタと同じ方法で活性アルミナコート層が形成されて
いる。The auxiliary filter 18 is also made of a cordierite honeycomb filter. Dimensions: diameter 120m, length 1
20n, the average pore diameter is about 150 μm, and the porosity is 60%. An activated alumina coat layer is formed on the surface of this honeycomb filter using the same method as the main filter.
活性アルミナコート層の形成後、フィルタに硝酸バリウ
ム（１３ａ （ＮＣｈ）ｚ ）を含浸し、乾燥、焼成し
てフィルタ容積１β当り約２５ｇのＢａを担持した。After forming the activated alumina coat layer, the filter was impregnated with barium nitrate (13a (NCh)z ), dried and fired to support about 25 g of Ba per 1β filter volume.
（実施例２）
第１実施例に対して、同じ主フィルタと平均細孔径が約
２００μｍで気孔率が６０％である補助フィルタを準備
した。補助フィルタは、同じ条件で活性アルミナコート
層を形成後、同じくフィルタ容積１１当り約２５ｇのＢ
ａを担持した。(Example 2) The same main filter as in the first example and an auxiliary filter having an average pore diameter of about 200 μm and a porosity of 60% were prepared. After forming the activated alumina coat layer under the same conditions, the auxiliary filter was also coated with about 25 g of B per filter volume 11.
carried a.
（比較例１）・
第１実施例に対して、同じ主フィルタと平均細孔径が約
１５０μｍで気孔率が６０％の補助フィルタを準備した
。(Comparative Example 1) A main filter and an auxiliary filter having an average pore diameter of about 150 μm and a porosity of 60% were prepared as in the first example.
（比較例２）
第１実施例に対して、同じ主フィルタと平均細孔径が約
２００μｍで気孔率が６０％の補助フィルタを準備した
。(Comparative Example 2) In contrast to the first example, the same main filter and an auxiliary filter having an average pore diameter of about 200 μm and a porosity of 60% were prepared.
（比較例３）
第１実施例に対して、同じ主フィルタを準備し、補助フ
ィルタは準備しなかった。(Comparative Example 3) The same main filter as in the first example was prepared, but no auxiliary filter was prepared.
（試験例１）
実施例１．２および比較例１〜５のフィルタを第１図に
示すディーゼルエンジンの排気系に取り付け、耐久試験
を行った。このディーゼルエンジンは、排気量２４００
ｃｃのターボチャージャー付きのエンジンである。耐
久試験は、４０００ｒｐｍの高負荷状態で３００時間の
運転で行った。(Test Example 1) The filters of Examples 1.2 and Comparative Examples 1 to 5 were attached to the exhaust system of a diesel engine shown in FIG. 1, and a durability test was conducted. This diesel engine has a displacement of 2400
It is a cc turbocharged engine. The durability test was conducted under a high load condition of 4000 rpm for 300 hours.
試験後、各側について主フィルタおよび補助フィルタに
おける被毒物層の形成状態、厚さ、成分等について分析
を行った。その結果を次代に示す。After the test, the formation state, thickness, composition, etc. of the poisonous substance layer in the main filter and the auxiliary filter were analyzed on each side. The results will be presented to the next generation.
し
上表から分かるように、排気系の上流側に補助フィルタ
を備えていない従来例としての比較例３゛ ・ では、
主フィルタの表面にＣａｔ Ｐｚ Ｏｌ、ＣａＳ Ｏａ
や、摩耗粉であるＦｅ、Ｏ，等を主成分とする被毒物質
層が５０〜７０μｍの厚さで形成され、触媒表面を覆っ
ている。また、補助フィルタの細孔径が１５０μｍ、２
００μｍのものについては、アルカリ金属を担持してい
ない比較例１および比較例２は、それぞれ５〜１５μｍ
、２０〜５０μｍの厚さで被毒物質層が形成されている
のに対して、アルカリ土類金属であるＢａが担持されて
いる実施例１および実施例２は、被毒物質層がほとんど
形成されないか、形成されても局部的に５〜１０μｍで
あり、極めて少ないことが分る。As can be seen from the table above, Comparative Example 3 is a conventional example that does not include an auxiliary filter on the upstream side of the exhaust system.
Cat Pz Ol, CaS Oa on the surface of the main filter
A layer of poisonous substances whose main components are Fe, O, etc., which are abrasion particles, is formed with a thickness of 50 to 70 μm, and covers the catalyst surface. In addition, the pore diameter of the auxiliary filter is 150 μm, 2
00 μm, Comparative Example 1 and Comparative Example 2, which do not support alkali metal, have a thickness of 5 to 15 μm, respectively.
, a poisonous substance layer is formed with a thickness of 20 to 50 μm, whereas in Examples 1 and 2 in which Ba, which is an alkaline earth metal, is supported, a poisonous substance layer is almost formed. It can be seen that it is either not formed, or even if it is formed, it is locally 5 to 10 μm, which is extremely small.
（試験例２）
試験例１における耐久試験後の主フィルタからそれぞれ
テストピースを切出してディーゼルエンジンの排気系に
取り付けて所定時間曝した後、第２図に示す触媒性能評
価装置に取り付け、触媒性能を評価した。(Test Example 2) Test pieces were cut out from the main filter after the durability test in Test Example 1, attached to the exhaust system of a diesel engine, exposed for a predetermined period of time, and then attached to the catalyst performance evaluation device shown in Figure 2 to evaluate the catalyst performance. was evaluated.
テストピースは、直径３０ｍ、長さ５０ｍの円筒状のも
のを１つのフィルタから４つ切り出した。Four cylindrical test pieces with a diameter of 30 m and a length of 50 m were cut out from one filter.
ディーゼルエンジンは、排気量が２４００ ｃｃの渦流
式ターボチャージャー付のものを用いた。そして、試験
条件は、２０００ｒｐｍ、大ガス温度が２００℃で２時
間運転を行い、テストピース１ケ当り０．６〜０．６５
ｇの微粒子を捕集した。The diesel engine used was one with a displacement of 2400 cc and a vortex turbocharger. The test conditions were 2000 rpm, 2 hours of operation at a large gas temperature of 200°C, and 0.6 to 0.65 per test piece.
g of fine particles were collected.
微粒子を捕集後、これらのテストピースは、第２図に示
す評価装置２０に取り付けられた。フィルタ２２は、反
応管２４内のモノリス担体２６の下流に取り付けられ、
上流側にはヒータ２８が配設される。このモノリス担体
２６は、触媒を担持されておらず、単にガスの整流に使
用されるものである。反応管２４は、上流側に試料ガス
導入口３０と下流側に排気口３２がそれぞれ設けられて
いる。モノリス触媒２６の上流側は、反応管２４の周囲
に電気炉３４が配設され、上流側の反応管２４内を加熱
するようにされている。この評価装置２０においては、
試料ガス導入口３０から流入するＮ２−〇□ガスが、反
応管２４内の上流側において電気炉３４によって加熱さ
れ、モノリス担体２６により、整流された後、ヒータ２
８により所定温度に加熱され、微粒子が付着したテスト
ピースとしてのフィルタ２２を通過し、排気口３２がら
排出される。After collecting the fine particles, these test pieces were attached to the evaluation device 20 shown in FIG. A filter 22 is mounted downstream of the monolithic support 26 within the reaction tube 24;
A heater 28 is provided on the upstream side. This monolith carrier 26 does not support a catalyst and is simply used for gas rectification. The reaction tube 24 is provided with a sample gas inlet 30 on the upstream side and an exhaust port 32 on the downstream side. On the upstream side of the monolith catalyst 26, an electric furnace 34 is disposed around the reaction tube 24 to heat the inside of the reaction tube 24 on the upstream side. In this evaluation device 20,
N2-〇□ gas flowing in from the sample gas inlet 30 is heated by the electric furnace 34 on the upstream side of the reaction tube 24, rectified by the monolith carrier 26, and then passed through the heater 2.
8 to a predetermined temperature, passes through a filter 22 serving as a test piece to which fine particles are attached, and is discharged through an exhaust port 32.
触媒性能の評価は、ヒータ２８によってフィルタ２２の
端面を所定温度に加熱した際のフィルタ２２に付着して
いる微粒子の燃焼率により表した。The evaluation of the catalyst performance was expressed by the combustion rate of particulates adhering to the filter 22 when the end face of the filter 22 was heated to a predetermined temperature by the heater 28.
その結果を次代に示すが、低い加熱温度で燃焼率が貰い
程良好な触媒性能を有すると考えられる。The results will be shown in the next section, but it is thought that the lower the heating temperature and the higher the combustion rate, the better the catalyst performance.
ム
上表から明らかなように、実施例１．２のものが、同一
端面部分加熱温度における燃焼率が高く、良好な触媒性
能を維持していることが分る。As is clear from the table above, it can be seen that Example 1.2 has a high combustion rate at the same end face partial heating temperature and maintains good catalyst performance.
以上、本発明の特定の実施例について説明したが、本発
明は、この実施例に限定されるものではなく、特許請求
の範囲に記載の範囲内で種々の実施態様が包含されるも
のである。Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims. .
以上より、本発明のディーゼルパティキュレート捕集装
置によれば、アルカリ土類金属を担持した被毒物捕集用
の補助フィルタを上流側に設けたので、主フィルタの被
毒が防止されフィルタの再生効率の向上を図ることがで
きる。As described above, according to the diesel particulate collection device of the present invention, since the auxiliary filter for collecting poisonous substances carrying alkaline earth metals is provided on the upstream side, poisoning of the main filter is prevented and filter regeneration is achieved. Efficiency can be improved.
また、補助フィルタは、主フィルタより圧力損失が少な
いので、排気系の背圧の上昇は無視できる程度である。Furthermore, since the auxiliary filter has less pressure loss than the main filter, the increase in back pressure in the exhaust system is negligible.
第１図および第２図は、本発明にかかるディーゼルパテ
ィキュレート捕集装置の実施例を説明するための図面で
あり、
第１図は、ディーゼルパティキュレート捕集装置の概略
構成図、
そして、第２図は、触媒性能評価装置である。
１０・−・−ディーゼルパティキュレート捕集装置１４
−−−−−−一排気系
１６−−−−−−・主フィルタ
エ８・−一−−−・−・補助フィルタ
出願人 トヨタ自動車株式会社1 and 2 are drawings for explaining an embodiment of the diesel particulate collection device according to the present invention. FIG. 1 is a schematic configuration diagram of the diesel particulate collection device; Figure 2 shows a catalyst performance evaluation device. 10.--Diesel particulate collection device 14
---------1 Exhaust system 16--Main filter 8-1-Auxiliary filter Applicant Toyota Motor Corporation
Claims (1)
集し除去するための装置であって、微粒子を燃焼させる
触媒成分を担持した主フィルタを排気系の下流側に設け
、主フィルタより圧力損失が少なくアルカリ土類金属を
担持した補助フィルタを排気系の上流側に設けたことを
特徴とするディーゼルパティキュレート捕集装置。This is a device for collecting and removing particulates emitted from diesel engines in the exhaust system.A main filter carrying a catalyst component that burns particulates is installed downstream of the exhaust system, and has less pressure loss than the main filter. A diesel particulate collection device characterized in that an auxiliary filter carrying an alkaline earth metal is provided on the upstream side of an exhaust system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25774387A JPH0621540B2 (en) | 1987-10-13 | 1987-10-13 | Diesel particulate collection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25774387A JPH0621540B2 (en) | 1987-10-13 | 1987-10-13 | Diesel particulate collection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01100309A true JPH01100309A (en) | 1989-04-18 |
| JPH0621540B2 JPH0621540B2 (en) | 1994-03-23 |
Family
ID=17310484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25774387A Expired - Lifetime JPH0621540B2 (en) | 1987-10-13 | 1987-10-13 | Diesel particulate collection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0621540B2 (en) |
-
1987
- 1987-10-13 JP JP25774387A patent/JPH0621540B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0621540B2 (en) | 1994-03-23 |
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