JP2019002298A - 排ガス浄化フィルタ - Google Patents
排ガス浄化フィルタ Download PDFInfo
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Classifications
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- 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
- F01N3/022—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
-
- 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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
-
- 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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/30—Honeycomb supports characterised by their structural details
- F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
-
- 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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
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- Materials Engineering (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Filtering Materials (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
【解決手段】外皮11、外皮内をハニカム状に区画する多孔質の隔壁12、及び隔壁12に囲まれたセル13を有する排ガス浄化フィルタ1である。隔壁12の気孔経路長10μm毎の頻度ヒストグラムにて表される隔壁12の気孔経路長分布において、累積頻度が58%以上である。累積頻度は、最大ピーク頻度を含んで隣接する合計3つの階級の頻度を加算した値の最大値である
【選択図】図1
Description
上記外皮内をハニカム状に区画する多孔質の隔壁(12)と、
上記隔壁に囲まれたセル(13)と、を有し、
上記隔壁の気孔経路長10μm毎の頻度ヒストグラムにて表される上記隔壁の気孔経路長分布において、最大ピーク頻度を含んで隣接する合計3つの階級の頻度を加算した値の最大値である累積頻度が58%以上である、排ガス浄化フィルタ(1)にある。
なお、特許請求の範囲及び課題を解決する手段に記載した括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものであり、本発明の技術的範囲を限定するものではない。
排ガス浄化フィルタに係る実施形態について、図1〜図8を参照して説明する。
なお、図1においては、図面作成の便宜のため隔壁及びセルの一部の記載を省略して示してあるが、実際には、隔壁やセルが存在する。隔壁は、一般にセル壁とも呼ばれる。
本形態においては、気孔経路長分布が異なる複数の多孔質フィルタを作製し、その性能を比較評価する。なお、実施形態2以降において用いた符号のうち、既出の実施形態において用いた符号と同一のものは、特に示さない限り、既出の実施形態におけるものと同様の構成要素等を表す。
排ガス浄化フィルタ1をガソリン直噴エンジンの排気管内に取り付け、排ガス浄化フィルタ1にPMを含む排ガスを流した。このとき、排ガス浄化フィルタに流入する前の排ガス中のPM数、排ガス浄化フィルタから流出する排ガス中のPM数を測定し、PM捕集率を算出した。測定条件は、温度450℃、排ガス流量2.76m3/minである。測定に用いたフィルタのサイズは、直径が132mmであり、軸方向の長さが100mmであり、隔壁に厚みは200μmである。測定は、フィルタ内にPMが堆積していない初期状態について行った。PM数の測定は、PM粒子数カウンタを用いて行った。PM捕集率と気孔経路長分布における上述の累積頻度との関係を図16に示す。
まず、各実施例、比較例について、栓部が形成されていない排ガス浄化フィルタを準備した。つまり、端面に栓部が形成されておらず、セルが両端面に開口した排ガス浄化フィルタを準備した。ガス透過係数の測定には、直径30mm、軸方向の長さ25mmの円柱形状であり、隔壁の厚み200μmの排ガス浄化フィルタを用いた。このような車載用などに用いられる実製品よりも外形寸法の小さな排ガス浄化フィルタは、実製品から所望寸法のフィルタをくり抜くことによって得られる。くり抜かれたフィルタの外皮は、例えばセメンティングにより形成することが可能である。
ΔP=ΔPinlet/exit+ΔPchannel+ΔPwall ・・・(i)
平均気孔径及び気孔率は、水銀圧入法の原理を用いた水銀ポロシメータにより測定した。水銀ポロシメータとしては、(株)島津製作所製のオートポアIV9500を用いた。測定条件は、以下の通りである。
気孔率(%)=総気孔容積/(総気孔容積+1/コージェライトの真比重)×100
R=NST/NM ・・・(x)
R=ρM/ρST ・・・(xi)
本形態においては、複数の排ガス浄化フィルタを作製し、ガス透過係数と捕集率との好ましい関係について調べる例である。まず、表7に示すように、溶融シリカ、タルク、水酸化アルミニウム、グラファイトからなる造孔材等を混合して、コージェライト化原料を含有する坏土を作製した。
A>−3.94k2−32.67k+91.45 ・・・(II)
11 外皮
12 隔壁
121 気孔
122 連通気孔
123 非連通気孔
13 セル
Claims (3)
- 外皮(11)と、
上記外皮内をハニカム状に区画する多孔質の隔壁(12)と、
上記隔壁に囲まれたセル(13)と、を有し、
上記隔壁の気孔経路長10μm毎の頻度ヒストグラムにて表される上記隔壁の気孔経路長分布において、最大ピーク頻度を含んで隣接する合計3つの階級の頻度を加算した値の最大値である累積頻度が58%以上である、排ガス浄化フィルタ(1)。 - 上記隔壁のガス透過係数kが0.8×10-12m2以上である、請求項1に記載の排ガス浄化フィルタ。
- 上記排ガス浄化フィルタの粒子状物質の捕集率Aと上記ガス透過係数kとが下記式(I)の関係を満足する、請求項2に記載の排ガス浄化フィルタ。
A>−3.94k2−32.67k+91.45 ・・・(I)
Priority Applications (5)
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JP2017115978A JP6693477B2 (ja) | 2017-06-13 | 2017-06-13 | 排ガス浄化フィルタ |
DE112018003000.8T DE112018003000B4 (de) | 2017-06-13 | 2018-06-13 | Abgasreinigungsfilter |
PCT/JP2018/022605 WO2018230611A1 (ja) | 2017-06-13 | 2018-06-13 | 排ガス浄化フィルタ |
CN201880039409.0A CN110741139B (zh) | 2017-06-13 | 2018-06-13 | 废气净化过滤器 |
US16/711,700 US10883401B2 (en) | 2017-06-13 | 2019-12-12 | Exhaust gas purification filter |
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JP2017115978A JP6693477B2 (ja) | 2017-06-13 | 2017-06-13 | 排ガス浄化フィルタ |
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JP6693477B2 JP6693477B2 (ja) | 2020-05-13 |
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US (1) | US10883401B2 (ja) |
JP (1) | JP6693477B2 (ja) |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10648380B2 (en) | 2018-06-27 | 2020-05-12 | Denso Corporation | Honeycomb structure body and exhaust gas purification filter |
WO2020217776A1 (ja) * | 2019-04-26 | 2020-10-29 | 株式会社デンソー | 排ガス浄化フィルタ |
WO2021033541A1 (ja) | 2019-08-20 | 2021-02-25 | 株式会社デンソー | 排ガス浄化フィルタ |
CN113507974A (zh) * | 2019-03-29 | 2021-10-15 | 株式会社电装 | 废气净化过滤器 |
CN113557352A (zh) * | 2019-07-29 | 2021-10-26 | 株式会社电装 | 废气净化过滤器 |
CN113613755A (zh) * | 2019-03-29 | 2021-11-05 | 株式会社电装 | 废气净化过滤器 |
US11331613B2 (en) | 2020-03-31 | 2022-05-17 | Ngk Insulators, Ltd. | Ceramic filter |
Families Citing this family (1)
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KR101931498B1 (ko) * | 2016-10-26 | 2018-12-21 | 한국가스공사 | 다공성 매질 내의 유동 해석을 이용한 다공성 매질의 투과도 산출방법 |
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WO2005009922A1 (ja) * | 2003-07-25 | 2005-02-03 | Ngk Insulators, Ltd. | セラミックス多孔質体及びその透過性能評価方法 |
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JP2013224609A (ja) * | 2012-04-20 | 2013-10-31 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
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JP7230671B2 (ja) | 2019-04-26 | 2023-03-01 | 株式会社デンソー | 排ガス浄化フィルタ |
CN113557352A (zh) * | 2019-07-29 | 2021-10-26 | 株式会社电装 | 废气净化过滤器 |
CN113557352B (zh) * | 2019-07-29 | 2023-10-31 | 株式会社电装 | 废气净化过滤器 |
WO2021033541A1 (ja) | 2019-08-20 | 2021-02-25 | 株式会社デンソー | 排ガス浄化フィルタ |
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JP6693477B2 (ja) | 2020-05-13 |
US20200116059A1 (en) | 2020-04-16 |
CN110741139B (zh) | 2021-07-20 |
DE112018003000T5 (de) | 2020-03-05 |
US10883401B2 (en) | 2021-01-05 |
WO2018230611A1 (ja) | 2018-12-20 |
DE112018003000B4 (de) | 2022-03-03 |
CN110741139A (zh) | 2020-01-31 |
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