JP6061688B2 - Catalytic device - Google Patents

Description

  The present invention relates to a catalyst device that decomposes a volatile organic compound (VOC) contained in a gas using a catalyst.

  2. Description of the Related Art There is known a printing apparatus that includes a decomposition unit that decomposes a volatile organic compound using a catalyst and a catalyst heating unit that heats the catalyst so as to reach an appropriate operating temperature (activation temperature). By providing these means, it is possible to decompose and purify organic compounds that volatilize from the ink. In addition to the printing apparatus, these means are also provided in a purification apparatus that purifies volatile organic compounds contained in the exhaust gas of an internal combustion engine, for example.

  As its basic structure, a catalyst and catalyst heating means are arranged in the middle of a flow path for circulating a gas containing a volatile organic compound, and the volatile organic compound is decomposed as the gas passes through the flow path. The exhaust gas containing no volatile organic compound is discharged out of the flow path. Patent Documents 1 and 2 disclose an apparatus having this basic structure.

JP 10-196351 A (published July 28, 1998) JP 7-54643 A (Patent No. 3390055 published on February 28, 1995)

  In order to promote the catalytic reaction, it is necessary to efficiently heat the catalyst. Sufficient catalytic activity (resolution of volatile organic compounds) can be exhibited by maintaining the catalyst at a proper operating temperature. On the other hand, if the catalytic activity is not sufficient, it is necessary to lengthen the contact time with the catalyst, so that the length of the flow path becomes longer when the reaction is performed in the flow path. This is one of the causes that make it difficult to reduce the size of the catalyst device. For example, even in the apparatus of Patent Document 1, it cannot be said that the heating efficiency of the catalyst is high, and there is a limit to downsizing. Further, the configuration of Patent Document 2 has a complicated configuration of the apparatus, so that there is a limit to downsizing and high manufacturing costs.

  Therefore, the present invention has been made in view of the above problems, and provides a catalyst device that can efficiently supply heat to the catalyst with a simple configuration, and can achieve downsizing and low cost. For the purpose.

  In order to solve the above problems, a first catalyst device according to the present invention is a catalyst device that decomposes a volatile organic compound contained in a gas with a catalyst, and has a cylindrical outer wall through which the gas flows. Body, the catalyst carried inside the outer wall body, and the cylindrical outer wall extending along the longitudinal direction of the cylindrical outer wall body to a central portion of the cylindrical outer wall body The rod-shaped heating means having an outer diameter smaller than the inner diameter of the body, the surface of the rod-shaped heating means, and the inner surface of the cylindrical outer wall body are in contact with the surface of the heating means A partition wall having heat conductivity, wherein the partition wall is provided with a passage portion through which the gas passes, and the partition walls are separated from each other along the longitudinal direction of the cylindrical outer wall body. A plurality of partition walls, and the catalyst comprises a plurality of partition walls. It is characterized by being carried on one even without.

  According to said structure, heat can be efficiently supplied to a catalyst with a simple structure. Therefore, the catalyst device can be realized at a low cost, and the device can be downsized.

  Here, generally, when a gas flows through the inside of the cylindrical structure, the flow velocity becomes the highest at the center of the cylindrical structure, and the amount of heat taken away by the flowing gas also becomes the largest. On the other hand, the amount of heat generated when the volatile organic compound contained in the gas is decomposed by the catalyst is also greatest at the center of the cylindrical structure. For this reason, it is difficult to keep the temperature of the catalyst constant in the cylindrical structure, and the catalytic reaction may partially fall. In this case, in order to realize a necessary catalytic reaction, it is necessary to increase the length of the flow path, that is, to increase the total length of the cylindrical structure, and the size of the apparatus cannot be avoided.

  However, according to the catalyst device of the present invention, the uneven temperature of the catalyst can be reduced and the catalyst can be efficiently heated.

  Specifically, first, as described above, the rod-shaped heating means is extended to the central portion of the cylindrical outer wall body along the longitudinal direction of the cylindrical outer wall body, so that the flow velocity is high. The temperature fluctuation at the center can be suppressed by the heating means.

  Next, according to the catalyst device of the present invention, the partition wall having thermal conductivity, the partition wall supporting the catalyst, is formed between the surface of the rod-shaped heating means and the inner surface of the cylindrical outer wall body. In between, it is placed in contact with the heating means. That is, the partition walls are arranged in such a way as to block the airflow in the flow path. Thereby, the catalyst other than the central portion of the cylindrical structure can be effectively heated by the partition wall that receives heat from the heating means.

  In addition, the gas passing through the partition passage part can also obtain heat from the heating means and the partition wall, and the temperature rises or the temperature drop is suppressed, which can contribute to efficient heating of the catalyst. .

  According to the catalyst device of the present invention, since the catalyst is supported on the partition wall, the catalyst is supported at a position away from the center of the cylindrical outer wall body where the flow velocity of the airflow is the largest. Yes. Thereby, the temperature fluctuation of the partition by an air current can be suppressed effectively. Since the partition wall in which temperature fluctuation is effectively suppressed is thermally coupled to the heating means, and the catalyst is supported on the partition wall, effective heat transfer from the heating means to the catalyst is achieved. Can be realized.

  Thereby, since a catalytic reaction is activated effectively, even if a cylindrical outer wall body is short, desired catalytic activity is realizable. Therefore, it can contribute to size reduction of the catalyst device.

  In addition, according to the catalyst device of the present invention, the number of partition walls can be adjusted, so that internal components can be easily rearranged according to the required decomposition performance.

  In addition, as described above, since the catalyst is supported on at least one of the partition walls provided apart from each other along the longitudinal direction of the cylindrical outer wall body, a carrier for supporting the catalyst is separately arranged. It is not necessary to install, and it can contribute to weight reduction of an apparatus.

  In addition, since the entire configuration of the catalyst device can be realized by an outer wall body, a rod-shaped heating means, and a partition wall arranged around the outer wall body, an efficient catalytic reaction can be achieved with a simpler configuration than the conventional configuration. Can be realized. Therefore, the apparatus can be realized at low cost.

  Moreover, in order to solve said subject, the 2nd catalyst apparatus which concerns on this invention is a catalyst apparatus which decomposes | disassembles the volatile organic compound contained in gas with a catalyst, Comprising: The cylinder shape through which the said gas distribute | circulates The outer wall body, the catalyst carried inside the outer wall body, and the cylindrical shape extending along the longitudinal direction of the cylindrical outer wall body to the central portion of the cylindrical outer wall body The rod-shaped heating means having an outer diameter smaller than the inner diameter of the outer wall body, the surface of the rod-shaped heating means, and the inner surface of the cylindrical outer wall body are in contact with the surface of the heating means. A partition wall having thermal conductivity, the partition wall provided with a passage through which the gas passes, the partition wall along the longitudinal direction of the cylindrical outer wall body, A plurality of them are provided apart from each other, and the catalyst includes the partition wall and It is characterized by being carried on specifically bound carrier.

  According to said structure, heat can be efficiently supplied to a catalyst with a simple structure. Therefore, the catalyst device can be realized at a low cost, and the device can be downsized.

  Here, generally, when a gas flows through the inside of the cylindrical structure, the flow velocity becomes the highest at the center of the cylindrical structure, and the amount of heat taken away by the flowing gas also becomes the largest. On the other hand, the amount of heat generated when the volatile organic compound contained in the gas is decomposed by the catalyst is also greatest at the center of the cylindrical structure. For this reason, it is difficult to keep the temperature of the catalyst constant in the cylindrical structure, and the catalytic reaction may partially fall. In this case, in order to realize a necessary catalytic reaction, it is necessary to increase the length of the flow path, that is, to increase the total length of the cylindrical structure, and the size of the apparatus cannot be avoided.

  However, according to the catalyst device of the present invention, the uneven temperature of the catalyst can be reduced and the catalyst can be efficiently heated.

  Specifically, first, as described above, the rod-shaped heating means is extended to the central portion of the cylindrical outer wall body along the longitudinal direction of the cylindrical outer wall body, so that the flow velocity is high. The temperature fluctuation at the center can be suppressed by the heating means.

  Next, according to the catalyst device of the present invention, the partition wall having thermal conductivity, the partition wall supporting the catalyst, is formed between the surface of the rod-shaped heating means and the inner surface of the cylindrical outer wall body. In between, it is placed in contact with the heating means. That is, the partition walls are arranged in such a way as to block the airflow in the flow path. Thereby, the catalyst other than the central portion of the cylindrical structure can be effectively heated by the partition wall that receives heat from the heating means.

  In addition, the gas passing through the partition passage part can also obtain heat from the heating means and the partition wall, and the temperature rises or the temperature drop is suppressed, which can contribute to efficient heating of the catalyst. .

  According to the catalyst device of the present invention, since the catalyst is supported on the carrier thermally coupled to the partition wall, the catalyst is the central portion of the cylindrical outer wall body in which the flow velocity of the air current is the largest. It is carried at a position away from the center. Thereby, the temperature fluctuation of the partition by an air current can be suppressed effectively. The partition wall in which temperature fluctuations are effectively suppressed in this way is thermally coupled to the heating unit, and effective heating from the heating unit to the catalyst is achieved through the carrier thermally coupled to the partition wall. Heat transfer can be realized.

  Thereby, since a catalytic reaction is activated effectively, even if a cylindrical outer wall body is short, desired catalytic activity is realizable. Therefore, it can contribute to size reduction of the catalyst device.

  Further, according to the catalyst device of the present invention, the number of partition walls and the amount of the carrier can be adjusted, so that internal components can be easily rearranged according to the required decomposition performance.

  In addition, since the entire configuration of the catalyst device can be realized by an outer wall body, a rod-shaped heating means, a partition wall disposed around the catalyst, and a carrier, it is more efficient with a simpler configuration than the conventional configuration. A simple catalytic reaction can be realized. Therefore, the apparatus can be realized at low cost.

  Further, in one embodiment of the first and second catalyst devices according to the present invention, in addition to the above configuration, the plurality of partition walls may be support means for supporting the heating means inside the outer wall body. preferable.

  According to the above configuration, since the plurality of partition walls also function as the support means, it is not necessary to separately provide a member for supporting the heating means, and the catalyst device can be realized simply and at a low cost. It can contribute to the conversion.

  In addition to the above-described configuration, one embodiment of the first and second catalyst devices according to the present invention includes a plate portion that surrounds the periphery of the heating unit and radially expands around the heating unit. A portion of the partition wall that is in contact with the surface of the heating means, and a cylindrical portion that extends along the surface of the heating means and surrounds the periphery of the heating means. It is preferable that the central portion of the plate portion is a raised portion.

  According to said structure, a partition can let a heating means penetrate the cylinder part currently formed in center part, and can hold | maintain (support) a heating means. When the partition wall is made of a material that can be elastically deformed, by designing the inner diameter of the cylindrical portion to be smaller than the outer diameter of the heating means, the cylindrical portion is heated by passing the heating means through the cylindrical portion. It is possible to achieve reliable heat conduction from the heating means to the partition wall while maintaining

  Moreover, in one form of the 2nd catalyst apparatus based on this invention, it is preferable that the said catalyst is carry | supported also by at least 1 of the said several partition in addition to the said structure.

  According to said structure, since a catalyst can be carry | supported also to the partition which the heat | fever of a heating means conveys, a catalytic reaction can be implement | achieved still more efficiently and it can contribute also to size reduction of an apparatus. .

  Moreover, in one form of the 2nd catalyst apparatus based on this invention, it is preferable that the said support | carrier is arrange | positioned between the said partition and the said partition in addition to the said structure.

  According to said structure, since a support | carrier becomes an aspect pinched | interposed into a partition, the efficient heat supply to a support | carrier is implement | achieved and a catalytic reaction can be improved.

  The present invention can provide a catalyst device that can efficiently supply heat to the catalyst with a simple configuration.

It is a perspective view of the catalyst device concerning Embodiment 1 of the present invention. It is a perspective view of the baffle with which the catalyst apparatus shown in FIG. 1 is equipped. It is a figure which shows the modification of the baffle with which the catalyst apparatus shown in FIG. 1 is equipped. It is a figure which shows the modification of the baffle with which the catalyst apparatus shown in FIG. 1 is equipped. It is a perspective view which shows the structure of a part of catalyst apparatus which concerns on Embodiment 2 of this invention.

Embodiment 1
Below, one Embodiment of the catalyst apparatus which concerns on this invention is described using FIGS. 1-4.

  The catalyst device according to the present invention has a function of decomposing a volatile organic compound contained in a gas with a catalyst, and can be installed in any device or apparatus to which this function is desired. For example, it can be mounted on a device equipped with an internal combustion engine as part of an exhaust gas purification device for the internal combustion engine. It can also be mounted on a printing device to decompose volatile organic compounds that volatilize from the ink of the printed matter.

(1) Configuration of Catalyst Device FIG. 1 shows the configuration of the catalyst device (first catalyst device) of the present embodiment. FIG. 1 is a perspective view of the catalyst device. As shown in FIG. 1, the catalyst device 1 includes an outer wall pipe 2 (outer wall body), a plurality of baffles 4 (partition walls) carrying a catalyst, a sheath heater pipe 6 (heating means), a heater holder 8, and a gas introduction unit. 10 and a cooling unit 12.

  The outer wall pipe 2 is a cylindrical outer wall body that allows gas to flow from the gas introduction part 10 connected to one end side to the cooling part 12 connected to the other end side. A plurality of baffles 4, a sheath heater tube 6, and a heater holder 8 are disposed inside the outer wall tube 2. The outer wall pipe 2 is not particularly limited in its configuration as long as it can provide an internal space through which gas flows and can provide an internal space for accommodating the baffle 4, the sheath heater pipe 6, and the heater holder 8. For example, a heat insulating layer may be formed on the outer periphery of the outer wall pipe 2. The outer wall pipe 2 does not have to constitute the outermost layer of the catalyst device.

  The sheath heater tube 6 is a rod-shaped and columnar heating means that extends in the central portion of the outer wall tube 2 along the longitudinal direction that is the conduction direction of the outer wall tube 2 and has an outer diameter smaller than the inner diameter of the outer wall tube 2. There is a heating means for directly or indirectly heating the catalyst supported on the baffle 4. The configuration of the sheath heater tube 6 itself is not particularly limited, and a conventionally known one can be used.

  If the heating (heat generation) temperature can be locally adjusted in the sheath heater tube 6, it is preferable to adjust the amount of heat generation in the upstream portion of the outer wall tube 2. This is because a large amount of heat is required in the catalyst in the upstream portion. This is because the active state of the catalyst can be maintained by the heat generated by the decomposition of VOC in the downstream portion of the outer wall pipe 2, while the decomposition heat is not sufficiently generated in the upstream portion.

  The sheath heater tube 6 is disposed at a predetermined position inside the outer wall tube 2 by the heater holder 8. Since the baffle 4 also functions as a support means for supporting the sheath heater tube 6, the sheath heater tube 6 can be disposed at a predetermined position inside the outer wall tube 2 only by the baffle 4 without providing the heater holder 8. . A power supply line 66 connected to an external power source is connected to the sheath heater tube 6, and the power supply line 66 is disposed along the inside of the gas introduction unit 10 as shown in FIG. 1.

  The plurality of baffles 4 are arranged in the pipe of the outer wall pipe 2, support the sheath heater pipe 6, receive heat generated by the sheath heater pipe 6, warm the pipe in the outer wall pipe 2, and carry the baffle 4. The heated catalyst is heated.

  The structure of the baffle 4 will be described with reference to FIG. FIG. 2 is a perspective view of the baffle 4. The baffle 4 is a disk-like structure having an outer diameter (diameter) that is approximately the same as or smaller than the inner diameter of the outer wall tube 2, and the front surface of the baffle 4 has a direction in which gas flows (airflow (Upstream) and the back side faces in the direction of gas flow (downstream of the gas). That is, the front and back surfaces of the baffle 4 are spread in a direction perpendicular to the extending direction of the outer wall tube 2. In other words, the baffle 4 is disposed in the pipe of the outer wall pipe 2 so as to block the airflow.

  As shown in FIG. 2, the baffle 4 is provided with a heater holding through portion 40 that communicates from the front side surface to the back side surface at the center thereof. The sheath heater pipe 6 is connected to the heater holding through portion 40. By inserting, the sheath heater tube 6 can be positioned and supported in the tube of the outer wall tube 2. The heater holding through portion 40 is configured such that its inner diameter is slightly smaller than the outer diameter of the sheath heater tube 6 when the sheath heater tube 6 is not inserted. Then, by inserting the sheath heater tube 6, the baffle 4 can be assembled to the sheath heater tube 6 in a state in which the heater holding through portion 40 is expanded and is in close contact with the outer periphery of the sheath heater tube 6. That is, it is preferable that the baffle 4 is made of an elastically deformable material. The diameter of the baffle 4 is the same as the inner diameter of the outer wall tube 2.

  Further, since a plurality of baffles 4 are arranged along the longitudinal direction of the outer wall tube 2, the sheath heater 6 is penetrated through the central portion of each baffle 4, so that the sheath heater is formed along the central axis of the outer wall tube 2. The pipe 6 can be disposed.

  As shown in FIG. 2, the periphery of the heater holding through portion 40 in the baffle 4 constitutes a cylindrical portion 41 that is raised and has a cylindrical shape. In a state where the sheath heater tube 6 is inserted into the heater holding through portion 40, the inner wall of the tube portion 41 contacts the outer peripheral surface of the sheath heater tube 6. As a result, the contact area with the sheath heater tube 6 can be made larger compared to a configuration in which the sheath heater tube is passed through a disk-like bobble that is not provided with the cylindrical portion 41, and the heat generated by the sheath heater tube 6 is effective. Can be received.

  Further, the cylindrical portion 41 is provided with a plurality of slits 43 as shown in FIG. 2 around the heater holding through portion 40. Each slit 43 is notched at the projecting end portion of the cylindrical portion 41, and extends along the extending direction of the sheath heater tube 6. Each slit 43 is elastically deformed by the insertion stress when the sheath heater tube 6 is inserted into the heater holding through portion 40, so that the tube portion 41 of the baffle 4 can reliably support the sheath heater tube 6. The number of the slits 43 may be provided in each of the four directions shown in FIG. 2, but there is no particular limitation on the number or location.

  The cylindrical portion 41 can be formed by raising, that is, bending, the central portion of the plate portion 42 that radially expands with the central portion of the baffle 4 as the central axis. That is, for example, the cylindrical portion 41 and the plate portion 42 can be integrally formed by pressing one metal plate. As the metal plate, a conventionally well-known metal having heat resistance and heat conductivity can be used, and a metal material which is cheaper than ceramics and excellent in workability can also be used. Specific examples include iron, steel, stainless steel, aluminum, and copper.

  In addition, if the material which comprises the baffle 4, more specifically the material which comprises the cylinder part 41 has a ductility and is a material which plastically deforms by insertion of the sheath heater pipe | tube 6, the slit 43 will not necessarily be provided. It is not necessary to provide it. FIG. 3 shows a modification of the baffle not provided with a slit. FIG. 3 is a perspective view of the baffle as in FIG. 2, and is different from the baffle in FIG. 2 in that a slit is not provided in the cylinder portion 41 ′.

  Next, in the state where the baffle 4 is disposed in the pipe of the outer wall pipe 2, the plate portion 42 is a surface that extends perpendicularly to the extending direction of the outer wall pipe 2 so as to block the air flow (the above-mentioned front side surface and back side surface )have.

  As shown in FIG. 2, the plate portion 42 is provided with a plurality of air holes 44 as passage portions through which gas passes. The air holes 44 are through-holes penetrating from the front surface of the plate portion 42 to the back surface thereof, and are scattered over the entire surface of the plate portion 42. The air holes can be formed by punching, for example.

  Each air hole 44 has a cylindrical shape as shown in FIG. Note that the air holes are not limited to this, and may have a honeycomb shape, for example. The diameter of each air hole 44 can be about 2 to 5 mm, for example.

  Moreover, as shown in the modification of FIG. 3, the formation density of the air holes 44a may be provided so as to be sparse in the central portion. By adopting the embodiment shown in FIG. 3, it becomes possible to make the temperature distribution uniform during the VOC decomposition.

  Still another modified example may be an elliptical air hole 44b formed radially around the central axis of the baffle 4 as shown in FIG. 4, and as shown in FIG. A part of 42 may be bent and raised to provide the air hole 44c.

  The baffle 4 having the above structure is heated by the sheath heater tube 6 so that the temperature is at least 100 ° C. or higher, desirably 200 ° C. or higher and 600 ° C. or lower.

  The baffle 4 carries a catalyst for decomposing volatile organic compounds contained in the gas. The supporting method is not particularly limited, and a film made of catalyst may be formed on the outer surface of the baffle 4, or a film of a mixture obtained by mixing the catalyst and other additives may be formed on the outer surface of the baffle 4. Also good. As another method, the catalyst may be mixed with the material constituting the baffle and integrally molded. Regarding the above-described film, as an example of the forming method, coating can be mentioned, but other well-known methods such as impregnation method and thermal spraying method can be used.

  As the catalyst, any catalyst that can decompose a volatile organic compound by a catalytic reaction can be used. However, the catalyst device of this embodiment can efficiently heat the catalyst. Of these catalysts, oxides such as chromium, nickel, iron, titanium, cobalt, cerium, and copper can be suitably used in addition to noble metals such as platinum and palladium. When these catalysts are used, it is preferable to heat the catalyst so that the temperature of the catalyst is 200 ° C. or more and 500 ° C. or less, so that the catalyst device of this embodiment is suitable.

  The catalyst to be supported is not limited to one type. A plurality of types of catalysts may be supported. Moreover, you may carry | support a different kind of catalyst for every baffle. For example, it is conceivable to employ a catalyst that exhibits excellent characteristics in the decomposition of intermediate products generated during the decomposition of volatile organic compounds.

  Here, the volatile organic compound is an organic chemical substance that easily volatilizes in the atmosphere at normal temperature and pressure, for example, hexane, heptane, octane, isooctane, cyclohexane, benzene, toluene, contained in a hydrocarbon solvent. o-xylene, m-xylene, p-xylene, ethylbenzene and the like, and propylene glycol monomethyl ether, propyl acetate, propylene glycol monomethyl ether acetate, ethylene glycol, tetralin, N-methyl-2-pyrrolidone and ethylene glycol monomethyl Organic chemical substances such as ether can be mentioned. Here, it has been described above that the catalyst device of the present embodiment can be mounted on a printing device, but these volatile organic compounds are also used in inks such as water-based ink, solvent ink, thermosetting ink, and ultraviolet curable ink. It is known that it volatilizes in the process of drying the printed matter. The catalyst device of this embodiment can decompose this volatile organic compound with the catalyst supported on the baffle 4.

  The catalyst only needs to be supported on at least one of the plurality of baffles 4, but it is preferable that the catalyst be supported on all the baffles 4 because an efficient catalytic reaction can be realized.

  A gas containing a volatile organic compound continuously introduced into the outer wall pipe 2 from the gas introduction unit 10 is decomposed into water vapor, carbon dioxide gas, etc. by a catalytic reaction by a catalyst supported on the baffle 4, and the cooling unit 12. The exhaust gas does not contain volatile organic compounds or has a reduced content of volatile organic compounds.

  The cooling unit 12 is configured to cool the gas discharged from the outer wall pipe 2. In the outer wall pipe 2, as described above, the gas itself is heated to, for example, 500 ° C., so the high-temperature gas is cooled in the cooling unit 12. As a cooling method, a method of taking outside air (a relatively cool gas that does not contain a volatile organic compound and is not heated) from the inlet 12 a upstream of the cooling unit 12 and mixes it with the gas from the outer wall pipe 2. There is.

(2) Assembling method of catalyst device As an assembling method of the catalyst device 1 shown in FIG. 1 of the present embodiment, (i) a step of preparing a baffle 4 supporting a catalyst, and (ii) a sheath heater tube 6 of the baffle 4 A step of inserting the sheath heater tube 6 until the baffle 4 is disposed at a predetermined position along the longitudinal direction of the sheath heater tube 6 by being inserted into the heater holding through portion 40; and (iii) the baffle 4 and the sheath heater tube. And (iv) introducing the baffle 4, the sheath heater tube 6, and the heater holder 8 into the outer wall tube 2. Here, in the above (ii), it is preferable to insert the sheath heater tube 6 from the back side of the paper surface of the heater holding through portion 40 of the baffle 4 shown in FIG. By this insertion, the slit 43 of the tube portion 41 is opened, and the tube portion 41 can support the sheath heater tube 6 with an appropriate pressure.

  Then, the baffle 4, the sheath heater tube 6, the heater holder 8, and the outer wall tube 2 are integrally connected to the upstream portion of the cooling unit 12 and connected to the gas introduction unit 10 through the power supply line 66. The assembly of the catalyst device 1 shown in FIG. 1 is completed.

(3) Modification (3-1) Modification [1]
In the above-described embodiment, as illustrated in FIGS. 2 to 4, the configuration in which the air holes 44, 44 ′, 44 ′ a are provided in the plate portion 42 of the baffle 4 has been described, but the present invention is not limited to this. Instead, the baffle may be composed of a wire mesh, and the catalyst may be supported on the gold wire using the method described above. In the wire mesh, a gap is formed between the gold wires, and this plays the same role as the air holes 44, 44a, 44b, 44c described above. Further, by providing a heater holding through portion at the center of the wire mesh, the sheath heater tube can be penetrated, and the wire mesh around the heater holding through portion is deformed so as to follow the outer periphery of the sheath heater tube. This part plays the same role as the cylindrical part 41 described above.

(3-2) Modification [2]
In the present embodiment described above, the mode using the disk-shaped baffle 4 (FIGS. 2 to 4) provided with the sheath heater tube insertion hole in the center has been described, but the present invention is not limited to this. For example, a ring-shaped baffle 4 shown in FIG. 2 is formed by combining a plurality of fan-shaped partial walls that have a through-hole that can penetrate the sheath heater tube and that radially expand around the through-hole. May be configured. Further, in the case of forming an annular baffle shape combining the fan-shaped partial walls, a gap may be provided between the partial walls, so that the gap may serve as a passage portion through which gas passes. Since the passage portion corresponds to the air hole of the baffle shown in FIGS. 2 to 4, it is not necessary to separately form an air hole in the partial wall.

[Embodiment 2]
Hereinafter, another embodiment of the catalyst device according to the present invention will be described with reference to FIG. In addition, about the same member as 1st embodiment, a common number is attached | subjected and the description is abbreviate | omitted.

(1) Configuration of Catalyst Device FIG. 5 is a perspective view showing a part of the catalyst device (second catalyst device) of the present embodiment. FIG. 5 shows a configuration in which the outer wall pipe 2 and the outer wall pipe 2 are disposed in the catalyst device 1 of the first embodiment. The second embodiment also includes the cooling unit 12 and the gas introduction unit 10 described in the first embodiment, but these are not shown in FIG.

  The difference between the catalyst device 1 ′ of the present embodiment and the catalyst device 1 of the first embodiment shown in FIG. 1 is in the place where the catalyst is supported. Specifically, in the catalyst device 1 ′ of the present embodiment, the carrier 20 is disposed between the adjacent baffles 4 ′ instead of supporting the catalyst on the baffle 4 ′, and the catalyst is supported on the carrier 20. ing.

  The carrier 20 has an annular structure having a through hole in the center, and the sheath heater tube 6 passes through the through hole. Moreover, the support | carrier 20 is comprised from the porous material and becomes a structure through which gas passes the hole. As an example, the carrier 20 can use a porous material such as porous ceramics. In addition, silica, SiC, or the like formed porous can be used as the porous material.

  A member provided with a hole through which air passes may be used as the carrier 20 other than what is generally called a porous material.

  The carrier 20 is held in contact with the adjacent baffles 4 ′, whereby the heat transferred from the sheath heater tube 6 to the baffles 4 ′ can be efficiently transferred to the carrier 20, and the catalyst can be brought to an appropriate operating temperature. . That is, the carrier 20 is thermally coupled to the adjacent baffle 4 ′. Similarly, the heat of the sheath heater tube 6 is transmitted from the sheath heater tube 6 in the carrier 20. The catalyst loading method on the carrier 20 is the same as the catalyst loading method on the baffle 4 described in the first embodiment.

  The baffle 4 ′ is the same as the baffle 4 shown in FIGS.

(2) Method for assembling catalyst device In the method for assembling the portion of the catalyst device 1 'of this embodiment shown in FIG. 5, the carrier 20 is loaded with the catalyst in advance, and the sheath heater tube 6 is connected to the baffle 4', the carrier 20, After alternately inserting into the outer wall tube 2, these can be fixed by the heater holder 8 and disposed at a predetermined position inside the outer wall tube 2 to complete the assembly. As a method for assembling the baffle 4 ′ and the sheath heater tube 6, the method described in the first embodiment may be employed.

(3) Modification (3-1) Modification [1]
In the present embodiment, the carrier 20 is made of a porous material, but the present invention is not limited to this. For example, instead of the porous material, a granular material may be filled between the baffle 4 ′ and the baffle 4 ′, and this may be used as the carrier 20 to support the catalyst. The granular material can be composed of silicon carbide, silica, or the like. For example, the particle size can be 1 mm to 5 mm. In this case, as a method for supporting the catalyst, there is a method in which the catalyst is supported by being applied to a granular material, but is not limited thereto.

(3-2) Modification [2]
In this embodiment, the catalyst is supported only on the carrier 20, but the present invention is not limited to this. For example, you may carry | support a catalyst on both the support | carrier 20 and the baffle 4 '. The configuration for supporting the catalyst on the baffle 4 'has been described in the first embodiment.

[Additional Notes]
A catalyst device 1 according to an embodiment of the present invention is a catalyst device that decomposes a volatile organic compound contained in a gas with a catalyst, and includes a cylindrical outer wall pipe 2 through which the gas flows and an outer wall pipe 2 inside. And a rod-shaped sheathed heater tube 6 having an outer diameter smaller than the inner diameter of the cylindrical outer wall tube 2 that extends in the center portion of the outer wall tube 2 along the longitudinal direction of the outer wall tube 2. The baffle 4 is disposed between the surface of the rod-shaped sheath heater tube 6 and the inner surface of the tubular outer wall tube 2 and has thermal conductivity in contact with the surface of the sheath heater tube 6. A baffle 4 provided with an air hole 44 passing therethrough, and a plurality of baffles 4 are provided apart from each other along the longitudinal direction of the cylindrical outer wall tube 2. , To at least one of the plurality of baffles 4 It is lifting.

  According to said structure, heat can be efficiently supplied to a catalyst with a simple structure. Therefore, the catalyst device 1 can be realized at low cost, and the catalyst device 1 can be downsized.

  Here, in general, when gas flows through the inside of the cylindrical structure, the flow velocity becomes the largest at the center of the cylindrical structure. Therefore, if the catalyst is arranged at the center, the amount of heat taken away from the catalyst increases and falls in the catalytic reaction, and thus the overall length of the cylindrical structure is increased in order to realize the necessary catalytic reaction. To be pressed.

  However, according to the catalyst device 1 according to an embodiment of the present invention, the rod-shaped sheath heater tube 6 is extended to the central portion of the tubular outer wall tube 2 along the longitudinal direction of the tubular outer wall tube 2, A catalyst is supported on a baffle 4 disposed between the sheath heater tube 6 and the inner surface of the outer wall tube 2 and separating the inside of the outer wall tube 2 into a plurality of spaces. Since the baffle 4 has thermal conductivity and is in contact with the sheath heater tube 6, when the sheath heater tube 6 generates heat, the heat can be obtained and the temperature can be increased. In the present invention, such a baffle 4 carries a catalyst. Therefore, it is possible to suppress a decrease in the temperature of the catalyst and suppress a decrease in the catalytic reaction. Thereby, in order to implement | achieve a desired catalytic reaction, it is not necessary to increase the full length of the cylindrical outer wall pipe 2, and it can contribute to size reduction of the catalyst apparatus 1. FIG.

  Further, since the baffle 4 is in contact with the sheath heater tube 6, heat can be effectively transferred from the sheath heater tube 6 to the catalyst via the baffle 4. Further, the gas passing through the air holes 44 of the baffle 4 obtains heat from the baffle 4 and the sheath heater tube 6 and the temperature rises or the temperature drop is suppressed. Thereby, the heat transfer of the gas to the catalyst carried on the baffle 4 is realized, and the catalyst is efficiently heated.

  In addition, as described above, since the catalyst is supported on at least one of the baffles 4 provided apart from each other along the longitudinal direction of the cylindrical outer wall tube 2, the carrier for supporting the catalyst is provided. It is not necessary to arrange separately, and it can contribute to the weight reduction of the catalyst apparatus 1. FIG.

  Further, the overall configuration of the catalyst device 1 can be realized by the outer wall tube 2, the rod-shaped sheath heater tube 6, and the baffle 4 arranged around the outer wall tube 2, so that the efficiency is improved by a simpler configuration than the conventional configuration. Catalytic reaction can be realized. Therefore, the catalyst device 1 can be realized at a low cost.

  Further, a catalyst device 1 ′ according to another embodiment of the present invention is a catalyst device 1 ′ that decomposes a volatile organic compound contained in a gas with a catalyst, and has a cylindrical outer wall through which the gas flows. The tube 2, the catalyst carried inside the outer wall tube 2, and the cylindrical shape extending along the longitudinal direction of the cylindrical outer wall tube 2 to the central portion of the cylindrical outer wall tube 2. The rod-shaped sheath heater tube 6 having an outer diameter smaller than the inner diameter of the outer wall tube 2, the surface of the rod-shaped sheath heater tube 6, and the inner surface of the cylindrical outer wall tube 2, A baffle 4 ′ having thermal conductivity in contact with the surface, and the baffle 4 ′ provided with an air hole 44 through which the gas passes. Are spaced apart from each other along the longitudinal direction of the outer wall tube 2 It is preferable that the catalyst is supported on a carrier 20 thermally coupled to the baffle 4 ′.

  According to said structure, heat can be efficiently supplied to a catalyst with a simple structure. Therefore, the catalyst device 1 ′ can be realized at low cost, and the catalyst device 1 ′ can be downsized.

  Here, in general, when gas flows through the inside of the cylindrical structure, the flow velocity becomes the largest at the center of the cylindrical structure. Therefore, if the catalyst is arranged at the center, the amount of heat taken away from the catalyst increases and falls in the catalytic reaction, and thus the overall length of the cylindrical structure is increased in order to realize the necessary catalytic reaction. To be pressed.

  However, according to the catalyst device 1 ′ according to another embodiment of the present invention, the rod-shaped sheath heater tube 6 is extended at the central portion of the tubular outer wall tube 2 along the longitudinal direction of the tubular outer wall tube 2. In addition, heat is transmitted from the baffle 4 ′ in contact with the sheath heater tube 6 to the catalyst of the carrier 20. Therefore, it is possible to suppress a decrease in the temperature of the catalyst and suppress a decrease in the catalytic reaction. Thereby, in order to implement | achieve a desired catalytic reaction, it is not necessary to increase the full length of the cylindrical outer wall pipe | tube 2, and it can contribute to size reduction of catalyst apparatus 1 '.

  Further, the gas passing through the air holes 44 of the baffle 4 ′ obtains heat from the baffle 4 ′ and the sheath heater tube 6, and the temperature rises or the temperature drop is suppressed. Thereby, the heat transfer of the gas to the catalyst carried on the carrier 20 is realized, and the catalyst is efficiently heated.

  In addition, the overall configuration of the catalyst device 1 ′ can be realized by the outer wall tube 2, the rod-shaped sheath heater tube 6, the baffle 4 ′ disposed around the outer wall tube 2, and the carrier 20. An efficient catalytic reaction can be realized with a simple configuration. Therefore, the apparatus can be realized at low cost.

  Further, in one embodiment of the catalyst device 1, 1 ′ according to the present invention, in addition to the above configuration, the plurality of baffles 4, 4 ′ are support means for supporting the sheath heater tube 6 inside the outer wall tube 2. It is preferable.

  According to the above configuration, since the plurality of baffles 4 and 4 ′ also function as the support means, it is not necessary to separately provide a member for supporting the sheath heater tube 6, and the catalyst device can be realized simply. Can contribute to cost reduction.

  Further, in one embodiment of the catalyst device 1, 1 ′ according to the present invention, in addition to the above configuration, the baffles 4, 4 ′ surround the sheath heater tube 6 and expand radially around the sheath heater tube 6. A plate portion 42 and a cylindrical portion 41 surrounding the periphery of the sheathed heater tube 6 extending along the surface of the sheathed heater tube 6 at the portion of the baffles 4, 4 ′ in contact with the surface of the sheathed heater tube 6. The cylindrical portion 41 is preferably a portion formed by raising the central portion of the plate portion 42.

  According to the above configuration, the baffles 4, 4 ′ can hold (support) the sheath heater tube 6 by allowing the sheath heater tube 6 to penetrate the cylindrical portion 41 formed at the center. When the baffles 4, 4 ′ are made of an elastically deformable material, the inner diameter of the tube portion 41 is designed to be smaller than the outer diameter of the sheath heater tube 6, thereby allowing the sheath heater tube 6 to penetrate the tube portion 41. Accordingly, it is possible to realize reliable heat conduction from the sheath heater tube 6 to the baffles 4 and 4 ′ while the tubular portion 41 holds the sheath heater tube 6.

  Further, in one embodiment of the catalyst device 1 ′ according to the present invention, in addition to the above configuration, the catalyst may be carried on at least one of the plurality of baffles 4 ′.

  According to the above configuration, the catalyst can also be supported on the baffle 4 ′ through which the heat of the sheath heater tube 6 is transmitted. Therefore, the catalytic reaction can be realized more efficiently, and the catalyst device 1 ′ can be downsized. Can also contribute.

  In addition to the above-described configuration, the catalyst device 1 ′ according to one embodiment of the present invention preferably includes the carrier 20 between the baffle 4 ′ and the baffle 4 ′.

  According to the above configuration, since the support 20 is sandwiched between the partition walls, efficient heat supply to the support 20 can be realized, and the catalytic reaction can be improved.

  Note that the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims, and technical means disclosed in different embodiments and modifications are appropriately combined. Embodiments obtained in this manner are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICATION This invention can be utilized for the apparatus which decomposes | disassembles the volatile organic compound contained in gas using catalysts, such as a gas purification apparatus.

1, 1 'catalyst device 2 outer wall pipe (outer wall body)
4, 4 'baffle
6 Sheath heater tube (heating means)
8 Heater holder 10 Gas introduction part 12 Cooling part 12a Inlet 20 Carrier 40 Heater holding penetration part 41 Tube part 42 Plate part 43 Slits 44, 44a, 44b, 44c Air hole (passage part)
66 Power supply line

Claims (2)

A catalytic device that decomposes a volatile organic compound contained in a gas with a catalyst,
A cylindrical outer wall through which the gas flows; and
The catalyst carried inside the outer wall body;
A rod-shaped heating means extending along the longitudinal direction of the cylindrical outer wall body to the central portion of the cylindrical outer wall body and having an outer diameter smaller than the inner diameter of the cylindrical outer wall body;
A partition wall disposed between the surface of the rod-shaped heating means and the inner surface of the cylindrical outer wall body and having thermal conductivity in contact with the surface of the heating means, through which the gas passes The partition provided with a section,
With
A plurality of the partition walls are provided apart from each other along the longitudinal direction of the cylindrical outer wall body,
The catalyst is supported on at least one of the plurality of partition walls ,
The plurality of partition walls are support means for supporting the heating means in the inside of the outer wall body,
The catalyst device according to claim 1, wherein the heating means has a larger amount of heat generation in an upstream portion than in a downstream portion of the outer wall body . The partition is
A plate portion that surrounds the periphery of the heating means and radially expands with the heating means as a central axis;
In a portion of the partition that is in contact with the surface of the heating means, a cylindrical portion that extends along the surface of the heating means and surrounds the periphery of the heating means;
Have
2. The catalyst device according to claim 1, wherein the cylindrical portion is a portion formed by raising a central portion of the plate portion.

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