JP2004041940A - Fluid treatment member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid treatment member which is capable of surely bringing a fluid into contact with a wall surface even when the flow rate of the fluid is increased, which is capable of keeping physical strength high and which does not cause a large pressure drop. <P>SOLUTION: The fluid treatment member 1 has a fluid passage 3 through which a fluid is passed and in which a plurality of columnar bodies 5 are arranged in such a way that the axial direction of the columnar bodies 5 intersects the flow direction (a) of the fluid in the fluid passage 3. Since the time for which a fluid is in contact with the surfaces of the columnar bodies 5 can be prolonged, the fluid treating capacity of the member can be enhanced. Further, when the flow rate of the fluid is increased, the effect of a slip stream formed behind the columnar bodies 5 is increased and, accordingly, even if the flow rate of a fluid is increased, the time for which the fluid is in contact with the surfaces of the columnar bodies 5 can be prolonged and lowering of the fluid treating capacity of the member can be prevented. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluid treatment member. More specifically, a catalyst carrier for adhering and supporting a catalytically active substance such as platinum, palladium, or manganese on the surface, an adsorbing member for adsorbing and removing pollutants contained in the fluid, and other fluids therein. The invention relates to a fluid treatment member that can be used for a member through which a fluid is treated.
[0002]
[Prior art]
Catalysts used for the treatment of gases such as automobile exhaust gases, combustion exhaust gases, harmful gases, odorous gases, and liquids such as sewage water usually have a so-called honeycomb structured catalyst carrier having a plurality of through holes. A catalyst carrier (hereinafter, simply referred to as a honeycomb carrier) having a catalytically active substance such as platinum, palladium, or manganese adhered thereto (hereinafter, referred to as a honeycomb catalyst) is used. In such a honeycomb catalyst, the fluid can be brought into contact with the surface of the honeycomb catalyst by passing a fluid such as exhaust gas through the above-described through-holes. Can be rendered harmless.
[0003]
In addition, activated carbon and zeolite are used for the treatment of harmful substances such as dust and hydrocarbons, nitrogen oxides, sulfur oxides, and environmental hormones contained in liquids such as sewage water contained in gases such as automobile exhaust gas and combustion exhaust gas. A suction member having a honeycomb structure made of a material is used. If a fluid such as exhaust gas is passed through the through hole of such an adsorption member, the harmful substance contained in the gas or liquid is adsorbed by the adsorption member when the fluid comes into contact with the surface of the adsorption member. Can be removed and the fluid can be purified.
[0004]
[Problems to be solved by the invention]
However, since the honeycomb catalyst has a structure in which the holes penetrate, the chance of contact of the fluid passing through the center of the holes with the wall surface is reduced. In particular, when the SV value, specifically, the flow rate of the fluid passing through the honeycomb catalyst is increased, the possibility that a part of the fluid passes through the honeycomb catalyst without coming into contact with the wall surface increases. If the fluid passes through, no catalytic reaction occurs between the fluid and the catalytically active substance, and harmful substances are discharged as it is. That is, the conventional honeycomb catalyst has a problem that the performance is deteriorated under the condition that the SV value is large.
Similarly, in the case of an adsorption member having a honeycomb structure, when the flow rate of the fluid passing through the member is increased, the possibility that a part of the fluid passes without contacting the wall surface increases. Since the harmful substance in the fluid cannot be adsorbed, the harmful substance is discharged as it is.
[0005]
Further, in order to improve the performance of the honeycomb catalyst under the condition of a large SV value, it is necessary to make the honeycomb finer. For a catalyst for treating exhaust gas of an automobile, the hole pitch is 0.8 mm or less, and the wall thickness is reduced. A value of 0.05 or less is required. However, it is difficult to manufacture a honeycomb carrier having such fine meshes, and the manufacturing cost is increased. In addition, the physical strength of the honeycomb structure itself is weakened because the wall thickness is reduced, so that practical use is difficult.
[0006]
On the other hand, instead of the honeycomb structure, a cylindrical member containing pellets containing a catalytically active substance or an adsorbent (hereinafter, referred to as a pellet-containing member) is also used for treating a fluid. In the case of this pellet-containing member, a finer space is formed between the pellets than the honeycomb eyes, so that even if the flow rate of the fluid is large, the fluid can be prevented from passing through. However, since this fine space is formed in a mesh shape between the pellets, the resistance when flowing the fluid is large, and a large pressure loss occurs as compared with the honeycomb catalyst. Therefore, in order to increase the flow rate of the fluid flowing through the pellet-containing member, a large-sized device such as a large-sized pump capable of forcibly flowing the fluid is required. It cannot be used under large conditions, and even if it does, the energy efficiency is very poor.
[0007]
In view of such circumstances, the present invention provides a fluid processing member that can surely contact a fluid with a wall surface even when the flow rate of the fluid is increased, can maintain a high physical strength, and does not generate a large pressure loss. The purpose is to do.
[0008]
[Means for Solving the Problems]
The fluid processing member according to claim 1 is a member having a fluid passage through which a fluid passes, and a plurality of pillars are provided in the fluid passage of the member, and the pillars are arranged such that the axial direction thereof is the axial direction. The fluid treatment member according to claim 2, wherein the fluid treatment member is disposed so as to intersect with a flow direction of the fluid in the fluid passage. It is characterized in that a catalytically active substance is attached.
According to a third aspect of the present invention, in the fluid processing member according to the first aspect, a material of the member is an adsorbent.
According to a fourth aspect of the present invention, in the fluid processing member according to the first aspect, the plurality of pillars are arranged in a staggered arrangement.
According to a fifth aspect of the present invention, in the invention according to the fourth aspect, a width of a gap formed between a pair of pillars arranged on an upstream side in the plurality of pillars arranged in a staggered manner. Are provided so as to be narrower than the width of the columnar body provided on the downstream side.
According to a sixth aspect of the present invention, in the fluid processing member according to the first aspect, a cross section of the columnar body has a polygonal shape having an apex on an upstream side.
According to a seventh aspect of the present invention, in the fluid processing member according to the first aspect, a cross section of the columnar body is a semicircle in which an upstream side is formed in an arc shape.
[0009]
According to the first aspect of the present invention, when the columnar body comes into contact with the fluid, the back surface of the columnar body, that is, a wake with a vortex is formed on the downstream side with respect to the flow direction of the fluid. The time during which the fluid stays in the vicinity can be lengthened. Therefore, since the contact time between the surface of the columnar body and the fluid can be lengthened, the fluid processing ability of the member can be improved. In addition, since the effect of the wake formed on the back surface of the columnar body increases when the flow rate of the fluid increases, even when the flow rate of the fluid increases, the contact time between the fluid and the surface of the columnar body can be kept long, It is possible to prevent the fluid processing capability of the member from being reduced.
According to the second aspect of the invention, the reaction time between the catalytically active substance on the surface of the columnar body and the fluid can be lengthened, so that the performance of the catalyst can be improved. Further, since the effect of the wake formed on the back surface of the columnar body increases when the flow rate of the fluid increases, the contact time between the fluid and the surface of the columnar body can be maintained long even when the SV value increases, and the catalyst can be maintained. Can be prevented from deteriorating.
According to the third aspect of the present invention, since the contact time between the surface of the columnar body and the fluid can be lengthened, the ability to remove harmful substances can be improved. In addition, since the effect of the wake formed on the back surface of the columnar body increases when the flow rate of the fluid increases, even when the flow rate of the fluid increases, the contact time between the fluid and the surface of the columnar body can be kept long, It is possible to prevent the ability to remove harmful substances from decreasing.
According to the fourth aspect of the present invention, since the pillars are arranged in a staggered arrangement, the fluid has a greater chance of contact with the pillars while flowing from the inlet to the outlet of the fluid passage. For this reason, the contact time between the surface of the columnar body and the fluid can be lengthened, so that the fluid processing ability of the member can be improved.
According to the fifth aspect of the present invention, since the columnar member always exists in the flow direction of the fluid, the fluid can be reliably brought into contact with the columnar member. For this reason, it is possible to prevent the fluid from passing from the inlet to the outlet of the fluid passage without making the mesh fine like a honeycomb carrier. Therefore, since it is not necessary to make the columnar body extremely thin, the strength of the member itself can be kept high while improving the fluid treatment capability of the member, and practical application is easy.
According to the invention of claim 6, a vortex is easily formed on the back surface of the columnar body, and the contact time between the surface of the columnar body and the fluid can be made longer, so that the fluid treatment capability of the member can be improved. .
According to the invention of claim 7, a vortex is easily formed on the back surface of the columnar body, and the contact time between the surface of the columnar body and the fluid can be made longer, so that the fluid treatment capability of the member can be improved. .
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view of a fluid processing member 1 of the present embodiment. 2A is a front view of the fluid processing member 1 of the present embodiment, and FIG. 2B is a cross-sectional view taken along line BB of FIG. FIG. 3 is an explanatory diagram of a wake formed on the back surface of the columnar body 5.
1 and 2, reference numeral 1 denotes a fluid processing member of the present embodiment. Reference numerals 2a to 2d indicate the wall surfaces of the fluid processing member 1, respectively. In the fluid processing member 1 of the present embodiment, a fluid passage 3 for flowing a fluid to be processed is formed in a space surrounded by four wall surfaces 2a to 2d. In the fluid passage 3, a plurality of columnar bodies 5 are provided between upper and lower wall surfaces 2a, 2b. The plurality of columnar bodies 5 are disposed so that their axial directions are parallel to each other and are orthogonal to the flow direction a of the fluid flowing in the fluid passage 3 (the vertical direction in FIG. 2B). ing.
[0011]
For this reason, when the fluid flows in the fluid passage 3, the fluid comes into contact with the columnar body 5. Then, a wake with a vortex is formed on the back surface of the columnar body 5, that is, on the downstream side of the columnar body 5 with respect to the flow direction a of the fluid (see FIG. 3). Therefore, the fluid flowing in the vicinity of the back surface of the columnar body 5 is taken into the vortex, circulates in the vortex for a while, and then flows downstream again. Will come in contact with you several times. That is, the time during which the fluid stays in the vicinity of the columnar body 5 can be extended, so that the contact time between the fluid and the surface of the columnar body 5 can be extended.
[0012]
Therefore, if a catalytically active substance such as platinum, palladium, or manganese is adhered to the surface of the columnar body 5, that is, if the fluid treatment member 1 is used as a catalyst carrier, the reaction time between the catalytically active substance and the fluid can be lengthened. Therefore, the performance of the catalyst can be improved.
Further, as the flow rate of the fluid increases, the flow velocity of the fluid passing near the columnar body 5 also increases. Then, the flow of the wake behind the columnar body 5 is greatly disturbed, and the effect of the wake also increases. Therefore, even if the SV value becomes large, the contact time between the fluid and the surface of the columnar body 5 can be kept long, so that the performance of the catalyst can be prevented from being lowered.
[0013]
In addition, if an adsorbent such as activated carbon or zeolite is used as the material of the fluid treatment member 1, that is, if the fluid treatment member 1 is used as the adsorption member, the contact time between the fluid treatment member 1 and the fluid can be lengthened. Therefore, the ability of the fluid treatment member 1 to remove harmful substances such as environmental hormones and dioxins contained in the fluid can be improved.
In addition, when the flow rate of the fluid increases, the flow velocity of the fluid passing near the columnar body 5 increases, and the effect of the wake increases. Therefore, the contact time between the fluid and the surface of the columnar body 5 can be maintained longer, which is harmful. The ability to remove substances can be prevented from being reduced.
[0014]
Note that the axial direction of the columnar body 5 does not necessarily need to be orthogonal as long as it intersects the flow direction.
Furthermore, of the four wall surfaces 2a to 2d, the side wall surfaces 2c and 2d may not be provided.
[0015]
As shown in FIG. 2B, the plurality of pillars 5 are arranged in a staggered arrangement. Further, the gap W1 between the adjacent pillars 5 located in the same plane orthogonal to the flow direction a is arranged so as to be smaller than the width W2 of the pillars 5 located downstream of the pillars 5. ing. Then, as shown in FIG. 2A, when the fluid processing member 1 is viewed from the front, there is almost no portion that can be seen from the inlet to the outlet of the fluid passage 3. That is, in the fluid passage 3, the columnar body 5 always exists in the flow direction a of the fluid.
For this reason, the fluid can be reliably brought into contact with the columnar body 5 without making the eyes fine like a member having a honeycomb structure, and the fluid that passes through the fluid passage 3 can be eliminated. In addition, since the space between the columnar bodies 5 can be sufficiently ensured, the pressure loss does not increase as in the case of the pellet-containing member. And since it is not necessary to make eyes small, it is not necessary to make columnar body 5 extremely thin. Therefore, the strength of the fluid treatment member 1 itself can be kept high while improving the performance of the catalyst and the ability to remove harmful substances, and practical application is easy.
Further, since the plurality of columnar members 5 are arranged in a staggered arrangement, it is possible to further increase the chance of the fluid contacting the columnar members 5 while flowing from the inlet to the outlet of the fluid passage 3. it can. For this reason, since the contact time between the surface of the columnar body 5 and the fluid can be further extended, the performance of the catalyst and the ability to remove harmful substances can be improved.
[0016]
The columnar body 5 has a square cross section, and is formed such that one diagonal line is parallel to the flow direction a of the fluid.
For this reason, the fluid can flow without decreasing the flow velocity so much on the upstream side of the center of the columnar body 5, and the cross section of the columnar body 5 decreases on the downstream side of the center of the columnar body 5. A vortex is likely to be formed on the back surface of. And since a vortex is easily formed on the back surface of the columnar body 5, the contact time between the surface of the columnar body 5 and the fluid can be made longer, and the performance of the catalyst and the ability to remove harmful substances can be improved. it can.
[0017]
The cross-sectional shape of the columnar body 5 may not be a square, but a shape in which a wake with a vortex is easily formed on the back surface of the columnar body 5 is preferable.
For example, as shown in FIG. 5, a triangular shape in which the apex faces the flow direction a of the fluid and the base is orthogonal to the flow direction a (FIG. 5A), or may be a simple circle (FIG. 5A). (B)), a semi-circular shape in which the upstream side in the flow direction a has an arc shape may be used (FIG. 5C), and there is no particular limitation.
[0018]
Furthermore, since the fluid treatment member of the present invention has the structure as described above, if a repellent or an aromatic is used instead of the catalytically active substance or the adsorbent, not only the catalyst carrier or the adsorbent, It can be used as a repellent member that keeps away birds and insects, an aromatic member that diffuses a good scent, and the like.
[0019]
Next, a method for manufacturing the fluid processing member 1 of the present embodiment will be described.
FIG. 4 is an explanatory diagram of a method for manufacturing the fluid processing member 1 of the present embodiment. In FIG. 4, reference symbol H indicates a clay. Symbol C indicates a cylinder of the extruder, and symbol P indicates a piston of the extruder.
[0020]
First, the upper honeycomb member 10 is attached to the discharge port h of the cylinder C of the extruder and clamped. A lower honeycomb member 11 having a through hole of the same shape and pitch as the upper honeycomb member 10 is formed on the lower surface of the clamped upper honeycomb member 10, and the central axis of the through hole is a through hole of the upper honeycomb member 10. To match the center axis of At this time, the lower honeycomb member 11 is held while being pressed against the upper honeycomb member 10 by the initial stopper S (FIG. 4A).
[0021]
Next, when the clay H is pushed out of the cylinder C by the piston P, the clay H is pushed out through the upper honeycomb member 10. Then, since the lower honeycomb member 11 is overlapped so that the central axis of the through hole thereof coincides with the central axis of the through hole of the upper honeycomb member 10, the clay H extruded through the upper honeycomb member 10 is , Enters the through-hole of the lower honeycomb member 11 (FIG. 4B).
When the clay H that has entered the through hole of the lower honeycomb member 11 hits the initial stopper S, the initial stopper S is removed. When the clay H is further extruded, a plurality of columnar clays 12 are formed between the upper and lower honeycomb members 10 and 11. (FIG. 4 (C)).
[0022]
When the upper and lower honeycomb members 10 and 11 are separated by a predetermined distance, that is, when the length of the columnar clay 12 becomes a predetermined length, the upper honeycomb member 10 is removed from the cylinder C. Then, when the removed member is dried and sintered, the upper and lower honeycomb members 10 and 11 become the upper and lower wall surfaces 2a and 2b, and the columnar clay 12 becomes the columnar body 5, so that the fluid treatment of the present embodiment is performed. The member 1 is formed.
[0023]
The fluid processing member 1 of the present embodiment can be used as a catalyst by supporting a catalytically active substance on the surfaces of the columnar body 5 and the wall surfaces 2a to 2d, and the adsorbent is contained in the kneaded material 12 of the material. If they are mixed, they can be used as adsorption members.
[0024]
【The invention's effect】
According to the first aspect of the present invention, since the reaction time between the surface of the columnar body and the fluid can be lengthened, the fluid treatment capacity of the member can be improved, and even if the flow rate of the fluid increases, the fluid treatment of the member can be improved. The ability can be prevented from being reduced.
According to the invention of claim 2, the reaction time between the catalytically active substance on the surface of the columnar body and the fluid can be lengthened, so that the performance of the catalyst can be improved and the performance of the catalyst can be improved even when the SV value increases. Can be prevented from decreasing.
According to the third aspect of the present invention, since the reaction time between the catalytically active substance on the surface of the columnar body and the fluid can be lengthened, the performance of the catalyst can be improved, and even if the flow rate of the fluid is increased, the harmful substance is reduced. Can be prevented from being reduced.
According to the invention of claim 4, since the reaction time between the surface of the columnar body and the fluid can be lengthened, the fluid processing capability of the member can be improved.
According to the fifth aspect of the present invention, since the columnar body does not need to be extremely thin, the strength of the fluid treatment member itself can be kept high while improving the fluid treatment capability of the member, and practical application is easy.
According to the invention of claim 6, a vortex is easily formed on the back surface of the columnar body, and the reaction time between the surface of the columnar body and the fluid can be made longer, so that the fluid treatment capability of the member can be improved. .
According to the invention of claim 7, a vortex is easily formed on the back surface of the columnar body, and the reaction time between the surface of the columnar body and the fluid can be made longer, so that the fluid processing ability of the member can be improved. .
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a fluid processing member 1 of the present embodiment.
FIG. 2A is a front view of the fluid processing member 1 of the present embodiment, and FIG. 2B is a cross-sectional view taken along the line BB of FIG.
FIG. 3 is an explanatory diagram of a wake formed on the back surface of a columnar body 5;
FIG. 4 is an explanatory diagram of a method for manufacturing the fluid processing member 1 of the present embodiment.
FIG. 5 is an explanatory diagram of a columnar body 5 having another shape of the fluid processing member 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fluid treatment member 3 Fluid passage 5 Columnar body

Claims (7)

A member having a fluid passage through which a fluid passes,
In the fluid passage of the member, a plurality of pillars are provided,
A fluid processing member, wherein the columnar body is disposed so that an axial direction thereof intersects a flow direction of a fluid in the fluid passage. The fluid treatment member according to claim 1, wherein a catalytically active substance is attached to surfaces of the plurality of columnar bodies. The fluid processing member according to claim 1, wherein the material of the member is an adsorbent. The fluid processing member according to claim 1, wherein the plurality of pillars are arranged in a staggered arrangement. In the plurality of pillars arranged in a staggered manner, the width of a gap formed between a pair of pillars arranged on the upstream side is smaller than the width of the pillars arranged on the downstream side. The fluid treatment member according to claim 4, wherein the fluid treatment member is arranged as follows. The fluid processing member according to claim 1, wherein a cross section of the columnar body has a polygonal shape having an apex on an upstream side. 2. The fluid processing member according to claim 1, wherein a cross section of the columnar body is a semicircle in which an upstream side is formed in an arc shape.

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