JP7313456B2 - ハニカム構造体及び排気ガス浄化装置 - Google Patents
ハニカム構造体及び排気ガス浄化装置 Download PDFInfo
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- JP7313456B2 JP7313456B2 JP2021545112A JP2021545112A JP7313456B2 JP 7313456 B2 JP7313456 B2 JP 7313456B2 JP 2021545112 A JP2021545112 A JP 2021545112A JP 2021545112 A JP2021545112 A JP 2021545112A JP 7313456 B2 JP7313456 B2 JP 7313456B2
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- honeycomb structure
- honeycomb
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Images
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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
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- F01N2370/00—Selection of materials for exhaust purification
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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- H05B2203/022—Heaters specially adapted for heating gaseous material
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Description
(1)柱状のハニカムセグメントが、接合材層を介して複数個接合して構成されている柱状のハニカム構造体であって、
前記柱状のハニカムセグメントは、外周壁と、前記外周壁の内側に配設され、一方の端面から他方の端面まで貫通して流路を形成する複数のセルを区画形成する多孔質の隔壁とを有し、
前記接合材層内に、金属部材が埋め込まれているハニカム構造体。
(2)外周壁と、前記外周壁の内側に配設され、一方の端面から他方の端面まで貫通して流路を形成する複数のセルを区画形成する多孔質の隔壁とを有する柱状のハニカム構造体であって、
前記外周壁の内部又は表面に、金属部材が配設されているハニカム構造体。
(3)(1)または(2)のハニカム構造体と、
前記ハニカム構造体の外周を螺旋状に周回するコイル配線と、
前記ハニカム構造体及び前記コイル配線を収容する金属管と、
を有する排気ガス浄化装置。
図1に、本発明の一実施形態の柱状のハニカム構造体10の外観模式図を示す。図2に、ハニカム構造体10の軸方向と垂直な断面模式図を示す。ハニカム構造体10は、柱状のハニカムセグメント17が、接合材層18を介して複数個接合して構成されている。ハニカムセグメント17は、外周壁11と、外周壁11の内側に配設され、一方の端面から他方の端面まで貫通して流路を形成する複数のセル15を区画形成する多孔質の隔壁12とを有する。
本発明の実施形態におけるハニカム構造体10の製造方法について詳細に説明する。まず、多孔質の隔壁を有し、隔壁によって複数のセルが区画形成されたハニカム構造体を作製する。例えば、コージェライトからなるハニカム構造体を作製する場合には、まず、坏土用材料としてコージェライト化原料を用意する。コージェライト化原料は、コージェライト結晶の理論組成となるように各成分を配合するため、シリカ源成分、マグネシア源成分、及びアルミナ源成分等を配合する。このうちシリカ源成分としては、石英、溶融シリカを用いることが好ましく、更に、このシリカ源成分の粒径を100~150μmとすることが好ましい。
上述した本発明の実施形態に係るハニカム構造体を用いて排気ガス浄化装置を構成することができる。図12は、例として、ハニカム構造体10が組み込まれた排気ガス浄化装置50の排気ガス流路の概略図を示している。排気ガス浄化装置50は、ハニカム構造体10とハニカム構造体10の外周を螺旋状に周回するコイル配線54とを有する。また、排気ガス浄化装置50は、ハニカム構造体10及びコイル配線54を収容する金属管52を有する。金属管52の拡径部52aに排気ガス浄化装置50を配置することができる。コイル配線54は固定部材55によって金属管52内に固定されてもよい。固定部材55は、セラミック繊維等の耐熱性部材であることが好ましい。ハニカム構造体10は触媒を担持してもよい。
42mm角、長さ85mm、隔壁厚さが0.1mm、隔壁間距離が約1mmの柱状のコージェライト製ハニカムセグメントを準備した。このハニカムセグメントの外周表面に、残部Fe-17質量%Crの材質で線径0.45mmの金属ワイヤーを巻き付けた。金属ワイヤーを周回させたハニカムセグメントの周囲に、金属ワイヤーを巻き付けていない同サイズのコージェライト製ハニカム同士を、接合材で接着することで接合体を作製した。接合材としては、平均粒径15μmのコージェライト粉末、平均長さ200μmのアルミナファイバー、コロイダルシリカ、及びカルボキシメチルセルロースを混合して調製した接合材を用いた。金属ワイヤーを巻き付けたハニカムセグメントを、接合体の中心とし、直径82mmの円柱形状になるように外周を加工し、ハニカム構造体を得た。
次に、誘導加熱装置を用いて、直径100mmの誘導加熱コイルで当該ハニカム構造体の加熱試験を行い、ハニカム構造体の端面の温度を赤外線温度計で測定した。投入電力は、14kWとし、誘導加熱周波数は30kHzで、ハニカム構造体の昇温性能を測定した。図13に、時間(秒)-温度(℃)の関係を表したグラフを示す。
11 外周壁
12 隔壁
15 セル
17 ハニカムセグメント
18 接合材層
21、31、41 金属部材
22、23、24、25、42、44、45 金属ワイヤー
32 コート層
38、39 目封止部
50 排気ガス浄化装置
52 金属管
53 制御部
54 コイル配線
55 固定部材
Claims (16)
- 柱状のハニカムセグメントが、接合材層を介して複数個接合して構成されている柱状のハニカム構造体であって、
前記柱状のハニカムセグメントは、外周壁と、前記外周壁の内側に配設され、一方の端面から他方の端面まで貫通して流路を形成する複数のセルを区画形成する多孔質の隔壁とを有し、
前記接合材層内に、金属部材が埋め込まれており、
前記金属部材の少なくとも一部が磁性体材料で構成されているハニカム構造体。 - 前記柱状のハニカム構造体が、更に外周表面にコート層を備え、
前記コート層の内部又は表面に、前記金属部材が配設されている請求項1に記載のハニカム構造体。 - 前記金属部材が、金属ワイヤーである請求項1または2に記載のハニカム構造体。
- 前記金属ワイヤーが、前記接合材層内において、前記ハニカムセグメントの外周に沿って周回するように設けられている請求項3に記載のハニカム構造体。
- 前記柱状のハニカムセグメントの外周に沿って周回するように設けられた前記金属ワイヤーが、前記柱状のハニカム構造体の軸方向と垂直な断面において、前記柱状のハニカムセグメントの外周に沿って周回するループ電流の流路を構成している請求項4に記載のハニカム構造体。
- 前記金属ワイヤーが、前記接合材層内において、前記ハニカムセグメントの軸方向と平行に伸びるように設けられている請求項3に記載のハニカム構造体。
- 前記金属部材が、金属箔または金属メッシュである請求項1または2に記載のハニカム構造体。
- 前記金属部材が、銅、鉄、アルミニウム、ニッケル、クロム、及びコバルトからなる群から選択される一種または二種以上で構成されている請求項1~7のいずれか一項に記載のハニカム構造体。
- 前記金属部材の全部が磁性体材料で構成されている請求項1~8のいずれか一項に記載のハニカム構造体。
- 前記磁性体材料は、450℃以上のキュリー点を有する請求項1~9のいずれか一項に記載のハニカム構造体。
- 前記磁性体材料は、25℃で20μΩcm以上の固有抵抗値を有する請求項1~10のいずれか一項に記載のハニカム構造体。
- 前記磁性体材料は、1000以上の最大透磁率を有する請求項1~11のいずれか一項に記載のハニカム構造体。
- 前記隔壁及び外周壁がセラミックス材料で構成されており、
前記セラミックス材料の熱伝導率が3W/mK以上である請求項1~12のいずれか一項に記載のハニカム構造体。 - 前記隔壁及び外周壁がセラミックス材料で構成されており、
前記セラミックス材料の熱膨張係数が3×10-6以上である請求項1~13のいずれか一項に記載のハニカム構造体。 - 前記隔壁及び外周壁がセラミックス材料で構成されており、
前記セラミックス材料がコージェライト、炭化珪素、珪素、チタン酸アルミニウム、窒化珪素、ムライト、及び、アルミナからなる群から選択される少なくとも1つである請求項1~14のいずれか一項に記載のハニカム構造体。 - 請求項1~15のいずれか一項に記載のハニカム構造体と、
前記ハニカム構造体の外周を螺旋状に周回するコイル配線と、
前記ハニカム構造体及び前記コイル配線を収容する金属管と、
を有する排気ガス浄化装置。
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