JPH06137538A - Catalyst structure - Google Patents
Catalyst structureInfo
- Publication number
- JPH06137538A JPH06137538A JP4289071A JP28907192A JPH06137538A JP H06137538 A JPH06137538 A JP H06137538A JP 4289071 A JP4289071 A JP 4289071A JP 28907192 A JP28907192 A JP 28907192A JP H06137538 A JPH06137538 A JP H06137538A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- catalyst structure
- fluid
- downstream side
- upstream side
- 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 title claims abstract description 65
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 230000017525 heat dissipation Effects 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 238000007084 catalytic combustion reaction Methods 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances 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
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- IXSUHTFXKKBBJP-UHFFFAOYSA-L azanide;platinum(2+);dinitrite Chemical compound [NH2-].[NH2-].[Pt+2].[O-]N=O.[O-]N=O IXSUHTFXKKBBJP-UHFFFAOYSA-L 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Chimneys And Flues (AREA)
- Incineration Of Waste (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Spray-Type Burners (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、加熱、暖房、乾燥等に
用いられる触媒燃焼装置や排ガス浄化用の触媒装置等に
用いられる触媒構造体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst structure used in a catalytic combustion device used for heating, heating, drying, etc., a catalytic device for purifying exhaust gas, and the like.
【０００２】[0002]
【従来の技術】従来、灯油等の液体燃料や都市ガス等の
気体燃料を用いた予混合気型燃焼装置における燃焼用触
媒や排ガス浄化用触媒は、流路内を流れる反応流体の流
速が大きいため、その流路内に設ける触媒の構成として
は、ハニカム構造によって多数の連通孔を設けた円柱状
の触媒構造体を採用することが検討されており、その一
部は実用化されている。2. Description of the Related Art Conventionally, a combustion catalyst and an exhaust gas purifying catalyst in a premixed gas combustion apparatus using a liquid fuel such as kerosene or a gas fuel such as city gas have a large flow velocity of a reaction fluid flowing in a flow passage. Therefore, as a structure of the catalyst provided in the flow path, it has been considered to employ a columnar catalyst structure having a large number of communication holes having a honeycomb structure, and a part thereof has been put into practical use.
【０００３】このように、ハニカム構造の表面に触媒被
膜を形成した触媒構造体は、流体の流れを阻害すること
なく、反応流体に対して効率良く触媒を作用させること
ができるように構成されている。As described above, the catalyst structure in which the catalyst coating is formed on the surface of the honeycomb structure is constructed so that the catalyst can efficiently act on the reaction fluid without obstructing the flow of the fluid. There is.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記し
た従来の触媒構造体、詳しくは円柱状ハニカム構造の触
媒構造体においては、その触媒構造体内部で反応熱が蓄
積されやすく、放熱性が悪いために、触媒成分の熱劣化
が生じ、耐久性が低いという課題があった。However, in the above-mentioned conventional catalyst structure, more specifically, in the cylindrical honeycomb structure, the reaction heat is easily accumulated inside the catalyst structure and the heat dissipation is poor. In addition, there is a problem that the catalyst component is thermally deteriorated and durability is low.
【０００５】本発明は以上のような従来の触媒構造体の
課題を考慮し、放熱性が良く、耐久性の高い触媒構造体
を提供することを目的とする。In view of the above problems of the conventional catalyst structure, it is an object of the present invention to provide a catalyst structure having good heat dissipation and high durability.
【０００６】[0006]
【課題を解決するための手段】本発明は、多数の連通孔
を有し、流路内の流体の流れ方向の厚みがほぼ一定であ
る触媒体を有し、流体の上流側から下流側に向けて、ま
たは下流側から上流側に向けて、触媒体の中央部がその
すべての周辺部又は一部の周辺部よりも凸状に形成され
ている触媒構造体である。According to the present invention, there is provided a catalyst body having a large number of communication holes and having a substantially constant thickness in the flow direction of a fluid in a flow path, and the fluid is provided from the upstream side to the downstream side of the fluid. In the catalyst structure, the central portion of the catalyst body is formed to be convex toward all or a part of the peripheral portion from the downstream side to the upstream side.
【０００７】[0007]
【作用】本発明では、例えば燃焼用触媒および排ガス浄
化用の触媒構造体は、凸に形成されていることによっ
て、多数の連通孔を構成している、例えばセルがそれぞ
れ部分的に露出して形成されているため、従来の円柱状
ハニカム型触媒構造体に比べて放熱性が良好であり、蓄
熱による内部温度の極端な上昇を緩和することができ
る。In the present invention, for example, the combustion catalyst and the exhaust gas purifying catalyst structure are formed in a convex shape to form a large number of communication holes. For example, the cells are partially exposed. Since it is formed, the heat dissipation is better than that of the conventional cylindrical honeycomb type catalyst structure, and the extreme rise of the internal temperature due to heat storage can be mitigated.
【０００８】[0008]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】図１は本実施例の触媒構造体の構成を示す
外観図であり、図２は図１の縦断面図であり、図３は図
２のハニカム構造を示す部分側面図である。これらの図
において、触媒体としての触媒構造体は、金属製の円盤
状のハニカム構造体１１と、そのハニカム構造体１１の
内壁および外壁に被覆された触媒材料（図示しない）と
から主として構成されている。FIG. 1 is an external view showing the structure of the catalyst structure of this embodiment, FIG. 2 is a vertical sectional view of FIG. 1, and FIG. 3 is a partial side view showing the honeycomb structure of FIG. In these drawings, the catalyst structure as a catalyst body is mainly composed of a metal disk-shaped honeycomb structure 11 and a catalyst material (not shown) coated on the inner wall and the outer wall of the honeycomb structure 11. ing.
【００１０】そのハニカム構造体１１は、多数の連通孔
１２を有し、流路内の流体の流れＡ方向の厚みｄがほぼ
一定であり、流体の上流側から下流側（Ａ方向）に向け
て、または下流側から上流側（Ａ方向と逆方向）に向け
て、その中央部１３がその周辺部１４よりも凸状に形成
されている。The honeycomb structure 11 has a large number of communicating holes 12, the thickness d of the fluid in the flow passage in the A direction is substantially constant, and the fluid flows from the upstream side to the downstream side (direction A). Or from the downstream side toward the upstream side (direction opposite to the direction A), the central portion 13 is formed to be more convex than the peripheral portion 14.
【００１１】その凸状に形成されているとは、放物線状
に湾曲されていることが最も好ましく、ハニカム構造体
１１を構成している各セル１５は、触媒構造体における
周辺部１４から中央部１３に向けて階段状に順次ずれた
状態で放物線状に接続されている。従って、各セル１５
についてはその外壁の一部１６，１７が露出することに
なり、それによって放熱のための表面積が大きく取れる
ようになっている。なお、この図１、図２の放物線状の
凸状は、図４の場合に比べ、分かりやすいように、大き
く突き出している様子を描いている。The convex shape is most preferably curved in a parabolic shape, and each cell 15 constituting the honeycomb structure 11 has a peripheral portion 14 to a central portion in the catalyst structure. It is connected in the form of a parabola in a state in which it is sequentially shifted toward 13 toward each other. Therefore, each cell 15
With regard to the above, parts 16 and 17 of the outer wall are exposed, which allows a large surface area for heat dissipation. It should be noted that the parabolic convex shape in FIGS. 1 and 2 is depicted as largely protruding as compared with the case in FIG.
【００１２】このような構成のハニカム構造体１１につ
いて、次の方法により触媒を被覆する。すなわち、Fe-C
r-Alを素材とした、凸状のハニカム構造体１１（リブ厚
さ：0.15mm、内径：φ106mm、厚さｄ：10mm、400セル/inc
h2）に、ＢａＯ・Ａｌ2Ｏ3・ＣｅＯ2粉末（比表面積１
２０ｍ2／ｇ）１０００ｇ，硝酸アルミニウム９水塩８
５ｇ，水 １３００ｇおよびジニトロジアンミン白金水
溶液とジニトロジアンミンパラジウム水溶液をそれぞれ
Ｐｔ、Ｐｄ換算で５ｇ、５ｇ加えてなるウォッシュコー
トスラリーで３０ｇ被覆し、燃焼用の触媒構造体を作製
する。The honeycomb structure 11 having such a structure is coated with a catalyst by the following method. That is, Fe-C
Convex honeycomb structure 11 made of r-Al (rib thickness: 0.15 mm, inner diameter: φ106 mm, thickness d: 10 mm, 400 cells / inc)
h 2 ), BaO · Al 2 O 3 · CeO 2 powder (specific surface area 1
20 m 2 / g) 1000 g, aluminum nitrate 9 hydrate 8
5 g of water, 1300 g of water, and 5 g of Pd and Pd equivalents of a dinitrodiammine platinum aqueous solution and a dinitrodiammine palladium aqueous solution, respectively, are coated with 30 g with a washcoat slurry to prepare a combustion catalyst structure.
【００１３】次に、このようにして得られた触媒構造体
を図４に示す予混合気型触媒燃焼装置に装着し、灯油を
燃料として燃焼試験を行った。同図において、触媒燃焼
装置は、燃料タンク１、燃料用ポンプ２、ファン３、混
合室４、補助炎口５、点火電極６、装着された触媒構造
体７、その触媒構造体の連通孔７ａ、熱線透過体８、お
よび排気口９から構成されている。Next, the catalyst structure thus obtained was mounted on the premixed gas type catalytic combustion apparatus shown in FIG. 4, and a combustion test was conducted using kerosene as fuel. In the figure, the catalytic combustion device includes a fuel tank 1, a fuel pump 2, a fan 3, a mixing chamber 4, an auxiliary flame port 5, an ignition electrode 6, a mounted catalyst structure 7, and a communication hole 7a of the catalyst structure. , A heat ray transmitting body 8 and an exhaust port 9.
【００１４】また、比較例として従来使用されていた円
柱状ハニカム（リブ厚さ：0.15mm、内径：φ106mm、厚
み：10mm、400セル/inch2）を用いて同様の実験を行っ
た結果、空気過剰率２．５において未燃の炭化水素量の
指標であるHC/CO2=1×10-4以下の可変燃焼範囲（ＴＤＲ
＝最大燃焼量／最小燃焼量）は、（表１）に示すような
結果として得られた。A similar experiment was conducted using a cylindrical honeycomb (rib thickness: 0.15 mm, inner diameter: φ106 mm, thickness: 10 mm, 400 cells / inch 2 ) which was conventionally used as a comparative example. A variable combustion range (TDR of HC / CO 2 = 1 × 10 -4 or less, which is an index of the amount of unburned hydrocarbons at an excess rate of 2.5)
= Maximum combustion amount / minimum combustion amount) was obtained as a result as shown in (Table 1).
【００１５】[0015]
【表１】 [Table 1]
【００１６】（表１）から分かるように、本実施例によ
る触媒構造体の方がＴＤＲに関し、高燃焼側に広がって
いる。As can be seen from (Table 1), the catalyst structure according to the present embodiment spreads to the high combustion side with respect to TDR.
【００１７】また、図４の燃焼装置を組み立て、１１０
０ｋｃａｌ／ｈ、空気過剰率（空気／燃料）１．８の条
件に設定し、５０００時間連続燃焼を行った後、ＴＤＲ
を測定した結果を同じく（表１）に示す。従来の円柱状
の触媒構造体では、測定結果におけるＴＤＲが０．７で
あるのに対し、本実施例のＴＤＲでは３．４となり、比
較的触媒の劣化が少なく、燃焼特性を維持することがで
きることがわかった。Assembling the combustion apparatus of FIG.
After setting the conditions of 0 kcal / h and the excess air ratio (air / fuel) of 1.8 and performing continuous combustion for 5000 hours, TDR
The results of the measurement are also shown in (Table 1). In the case of the conventional columnar catalyst structure, the TDR in the measurement result is 0.7, whereas the TDR of this example is 3.4, and the deterioration of the catalyst is relatively small and the combustion characteristics can be maintained. I knew I could do it.
【００１８】これらの結果より、本実施例の凸状ハニカ
ム触媒構造体は、より大きなＴＤＲと触媒成分の長寿命
化を可能にすることがわかった。From these results, it was found that the convex honeycomb catalyst structure of this example enables a larger TDR and a longer life of the catalyst component.
【００１９】このように、本実施例の触媒構造体を使用
すれば、反応領域の上限を決定する要素となっていた触
媒構造体の耐熱限界をより高温側に、言い換えれば、耐
熱限界を決定する予混合速度をより高速側に移行するこ
とができるため、良好な排ガス特性が得られる反応領域
を従来よりも広げることができる。As described above, when the catalyst structure of this embodiment is used, the heat resistance limit of the catalyst structure, which has been a factor in determining the upper limit of the reaction region, is set to a higher temperature side, in other words, the heat limit is determined. Since it is possible to shift the premixing speed to a higher speed side, it is possible to widen the reaction region in which good exhaust gas characteristics are obtained as compared with the conventional case.
【００２０】また、従来の円柱状ハニカム型触媒構造体
と同じ条件で使用する場合では、触媒構造体における熱
劣化が大幅に抑えられるため、触媒構造体の長寿命化が
可能になる。また、触媒構造体の凸状に形成されている
面を、例えば放物線状に湾曲させれば、上記した効果が
最も顕著に現れる。Further, when used under the same conditions as the conventional cylindrical honeycomb type catalyst structure, thermal deterioration of the catalyst structure is significantly suppressed, so that the life of the catalyst structure can be extended. Further, when the convex surface of the catalyst structure is curved, for example, in a parabolic shape, the above-mentioned effects are most remarkable.
【００２１】なお、本発明の実施例では、流体の上流側
から下流側に向けて触媒構造体が凸状に形成されている
構成について説明したが、流体の下流側から上流側に向
けて触媒構造体が凸状に形成されていても本実施例と同
様の効果を得ることができる。In the embodiment of the present invention, the structure in which the catalyst structure is formed in a convex shape from the upstream side to the downstream side of the fluid has been described, but the catalyst structure is formed from the downstream side to the upstream side of the fluid. Even if the structure is formed in a convex shape, the same effect as that of this embodiment can be obtained.
【００２２】また、本発明の触媒構造体は、放物線状に
湾曲した状態で凸状に形成されていることが好ましい
が、これに限らず、階段状に凸状であってもよく、ま
た、半球状に凸状であってもよく、さらには円錐状に凸
状であってもよく、要するに面積を大きくできる凸状で
ありさえすればよい。Further, the catalyst structure of the present invention is preferably formed in a convex shape in a parabolic curved shape, but not limited to this, it may be a stepwise convex shape, It may have a hemispherical convex shape, or may have a conical convex shape, that is, as long as it has a convex shape capable of increasing the area.
【００２３】また、本発明の触媒構造体は、上記実施例
では円盤状に構成したが、これに限らず、流体の流路断
面が矩形であれば、それに応じて矩形板状に構成するこ
ともできる。なお、その場合、触媒構造体の中央部は、
一部の周辺部よりも凸、例えば上下に対向する内壁側周
辺部よりも凸状、または左右に対向する内壁側周辺部よ
りも凸に形成されていればよい。Further, although the catalyst structure of the present invention is formed in a disk shape in the above embodiment, the present invention is not limited to this, and if the cross section of the fluid flow path is rectangular, it may be formed in a rectangular plate shape accordingly. You can also In that case, the central portion of the catalyst structure is
It may be formed so as to be convex rather than a part of the peripheral portion, for example, to be convex so as to be more convex than the inner wall-side peripheral portion that vertically opposes, or to be convex than the inner wall-side peripheral portion that opposes left and right.
【００２４】[0024]
【発明の効果】以上説明したことから明かなように、本
発明の触媒構造体は放熱性に優れるために、触媒層内の
蓄熱を原因とする触媒成分の熱劣化を抑えることがで
き、またそれによって制限されていた触媒の反応領域を
広げることができる。As is apparent from the above description, the catalyst structure of the present invention is excellent in heat dissipation, so that it is possible to suppress the thermal deterioration of the catalyst component due to the heat accumulation in the catalyst layer. As a result, the reaction area of the catalyst, which has been limited, can be expanded.
【図１】本発明の一実施例に用いた触媒構造体の外観図
である。FIG. 1 is an external view of a catalyst structure used in an example of the present invention.
【図２】本発明の一実施例に用いた触媒構造体の縦断面
図である。FIG. 2 is a vertical cross-sectional view of a catalyst structure used in one example of the present invention.
【図３】図２のハニカム構造を示す部分側面図である。FIG. 3 is a partial side view showing the honeycomb structure of FIG.
【図４】本発明の実施例に係る触媒燃焼装置の全体構成
を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing the overall configuration of a catalytic combustion device according to an embodiment of the present invention.
１１ ハニカム構造体 １２ 連通孔 １３ 中央部 １４ 周辺部 １５ セル １６ 外壁の一部 １７ 外壁の一部 11 Honeycomb structure 12 Communication hole 13 Central part 14 Peripheral part 15 Cell 16 Part of outer wall 17 Part of outer wall
Claims (4)
れ方向の厚みがほぼ一定である触媒体を有し、前記流体
の上流側から下流側に向けて、または下流側から上流側
に向けて、前記触媒体の中央部がそのすべての周辺部又
は一部の周辺部よりも凸状に形成されていることを特徴
とする触媒構造体。1. A catalyst body having a large number of communication holes, the thickness of which is substantially constant in the flow direction of the fluid in the flow path, and from the upstream side to the downstream side of the fluid, or from the downstream side. A catalyst structure, characterized in that the central portion of the catalyst body is formed to be more convex toward the upstream side than all the peripheral portions or a part of the peripheral portion.
湾曲していることを特徴とする請求項１記載の触媒構造
体。2. The catalyst structure according to claim 1, wherein the convex structure means that the catalyst structure is curved in a parabolic shape.
特徴とする請求項１記載の触媒構造体。3. The catalyst structure according to claim 1, wherein the catalyst body is formed in a circular plate.
特徴とする請求項１記載の触媒構造体。4. The catalyst structure according to claim 1, wherein the catalyst body is formed in a rectangular plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4289071A JP3042742B2 (en) | 1992-10-27 | 1992-10-27 | Catalyst structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4289071A JP3042742B2 (en) | 1992-10-27 | 1992-10-27 | Catalyst structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06137538A true JPH06137538A (en) | 1994-05-17 |
| JP3042742B2 JP3042742B2 (en) | 2000-05-22 |
Family
ID=17738453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4289071A Expired - Fee Related JP3042742B2 (en) | 1992-10-27 | 1992-10-27 | Catalyst structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3042742B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014132215A (en) * | 2013-01-02 | 2014-07-17 | Eberspaecher Climate Control Systems Gmbh & Co Kg | Catalyst combustor, particularly catalyst combustor for vehicle heater |
| JP2016138032A (en) * | 2015-01-29 | 2016-08-04 | イビデン株式会社 | Honeycomb structure and method for producing the same |
-
1992
- 1992-10-27 JP JP4289071A patent/JP3042742B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014132215A (en) * | 2013-01-02 | 2014-07-17 | Eberspaecher Climate Control Systems Gmbh & Co Kg | Catalyst combustor, particularly catalyst combustor for vehicle heater |
| US10359190B2 (en) | 2013-01-02 | 2019-07-23 | Eberspächer Climate Control Systems GmbH & Co. KG | Catalytic burner, especially for a vehicle heater |
| JP2016138032A (en) * | 2015-01-29 | 2016-08-04 | イビデン株式会社 | Honeycomb structure and method for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3042742B2 (en) | 2000-05-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |