JP2013238171A - Gas treatment device and gas treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas treatment device and a gas treatment method which effectively increase retention without complicating a structure.SOLUTION: A gas treatment device 1 includes a treatment structural body 20, a metal casing 30 which stores the treatment structural body, and a retention member 10 arranged between the treatment structural body and the casing. The retention member is made from silica fiber, has bulk density of 0.35 g/cmor greater and 0.45 g/cmor smaller, and may have retention per unit area of 6.0 N/cmor greater. Further, the retention member is made from alumina fiber, have bulk density of 0.35 g/cmor greater and 0.45 g/cmor smaller, and may have retention per unit area of 4.15 N/cmor greater.

Description

  The present invention relates to a gas processing apparatus and a gas processing method, and more particularly to an increase in holding force in the gas processing apparatus.

  For automobiles and other vehicles, catalytic converters for removing harmful substances such as carbon monoxide, hydrocarbons and nitrogen oxides contained in the exhaust gas of gasoline engines, and particles contained in the exhaust gas of deal engines are removed. A gas processing device such as a DPF (Diesel particulate filter) is provided.

  For example, as a catalytic converter, a cylindrical catalyst carrier, a cylindrical metal casing that houses the catalyst carrier, a mat-like inorganic fiber holding material disposed between the catalyst carrier and the casing, There is something with.

In such a catalytic converter, the holding material plays a role of preventing the catalyst carrier from falling off the casing. In this regard, for example, in Patent Document 1, for example, a catalyst carrier is accommodated in a casing, a seal member is disposed between a cylindrical portion of the catalyst carrier and a cylindrical wall inner peripheral surface of the casing, and The corners at both ends of the catalyst carrier in the axial direction can prevent the casing from being deformed effectively at a high temperature and reliably hold the catalyst carrier by restricting the axial position of the catalyst carrier via a buffer member with a cap. Have been described. Patent Document 2 discloses a catalyst carrier, a case portion containing the catalyst carrier, a cone portion that guides exhaust gas to the catalyst carrier, and a metal mesh disposed between the catalyst carrier and the cone portion. In the catalytic converter including the ring, the density of the portion sandwiched between the catalyst carrier and the cone portion of the metal mesh ring is set to 1.2 to 1.4 g / cm ³ , whereby heat resistance is improved. It is described to provide a catalytic converter that is highly vibration resistant.

Japanese Patent Laid-Open No. 11-062572 JP 2008-057509 A

  However, the conventional catalytic converter as described above has to have a complicated structure by providing a special member in addition to the casing, the catalyst carrier and the holding material.

  The present invention has been made in view of the above problems, and one of its objects is to provide a gas processing apparatus and a gas processing method that effectively increase the holding force without complicating the structure. To do.

In order to solve the above problems, a gas processing apparatus according to an embodiment of the present invention includes a processing structure, a metal casing that accommodates the processing structure, and the processing structure and the casing. a gas processing apparatus including a holding member that is, the holding member is made of silica fibers, the bulk density of the holding material, 0.35 g / cm ³ or more, 0.45 g / cm ³ or less The holding force per unit area of the holding material is 6.00 N / cm ² or more. ADVANTAGE OF THE INVENTION According to this invention, the gas processing apparatus which increased holding force effectively can be provided, without complicating a structure.

In order to solve the above problems, a gas processing apparatus according to an embodiment of the present invention includes a processing structure, a metal casing that accommodates the processing structure, and the processing structure and the casing. a gas processing apparatus including a holding member that is, the holding member is made of alumina fibers, the bulk density of the holding material, 0.35 g / cm ³ or more, 0.45 g / cm ³ or less In addition, the holding force per unit area of the holding material is 4.15 N / cm ² or more. ADVANTAGE OF THE INVENTION According to this invention, the gas processing apparatus which increased holding force effectively can be provided, without complicating a structure.

  Further, in any one of the gas processing apparatuses, the holding force at the time when the time of 24 hours or more has elapsed from the time when the insertion of the holding material into the casing is completed is within 5 minutes from the time when the insertion is completed. It is good also as a ratio with respect to the said retention strength at the time of elapse of time of 120% or more.

  In order to solve the above problems, a gas processing apparatus according to an embodiment of the present invention includes a processing structure, a metal casing that accommodates the processing structure, and the processing structure and the casing. Per unit area of the holding material when a time of 24 hours or more has elapsed from the time when the insertion of the holding material into the casing is completed. The ratio of the holding force to the holding force at a time point within 5 minutes after the completion time is 120% or more. ADVANTAGE OF THE INVENTION According to this invention, the gas processing apparatus which increased holding force effectively can be provided, without complicating a structure.

Moreover, the said gas processing apparatus WHEREIN: The bulk density of the said holding material is good also as being 0.35 g / cm < ³ > or more and 0.45 g / cm < ³ > or less. In any one of the gas processing apparatuses, the inorganic fiber may be a silica fiber or an alumina fiber. Further, in the gas processing device, the holding member is made of silica fibers, the bulk density of the holding material, 0.35 g / cm ³ or more and 0.45 g / cm ³ or less, a unit of the holding member The holding force per area may be 6.00 N / cm ² or more. Further, in the gas processing device, the holding member is made of alumina fibers, the bulk density of the holding material, 0.35 g / cm ³ or more and 0.45 g / cm ³ or less, a unit of the holding member The holding force per area may be 4.15 N / cm ² or more.

  A gas processing method according to an embodiment of the present invention for solving the above-described problems is characterized in that a gas is processed using any one of the gas processing apparatuses. ADVANTAGE OF THE INVENTION According to this invention, the gas processing method by the gas processing apparatus which increased effectively the retention strength without complicating a structure can be provided.

  According to the present invention, it is possible to provide a gas processing apparatus and a gas processing method that can effectively increase the holding power without complicating the structure.

It is explanatory drawing which shows an example of the gas processing apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows an example of the cross section which cut | disconnected the gas processing apparatus which concerns on one Embodiment of this invention to the longitudinal direction. It is explanatory drawing which shows the outline | summary of the test apparatus used in the Example which concerns on one Embodiment of this invention. It is explanatory drawing which shows the result of having evaluated the retention strength in Example 1 which concerns on one Embodiment of this invention. It is explanatory drawing which shows the result of having evaluated holding force in the comparative example 1 which concerns on one Embodiment of this invention. It is explanatory drawing which shows the result of having evaluated the retention strength in Example 2 which concerns on one Embodiment of this invention. It is explanatory drawing which shows the result of having evaluated the relationship between the bulk density and the recovery rate of retention strength in the Example which concerns on one Embodiment of this invention. It is explanatory drawing which shows the result of having evaluated the relationship between the bulk density and retention strength in the Example which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described. Note that the present invention is not limited to this embodiment.

  First, an outline of the present embodiment will be described. FIG. 1 is an explanatory diagram illustrating an example of a gas processing apparatus (hereinafter referred to as “the present apparatus 1”) according to the present embodiment. As shown in FIG. 1, the apparatus 1 includes a processing structure 20, a metal casing 30 that houses the processing structure 20, and a holding unit that is disposed between the processing structure 20 and the casing 30. The material 10 is provided. In FIG. 1, for convenience of explanation, a part of the casing 30 is omitted, and the processing structure 20 and the holding material 10 housed in the casing 30 are exposed.

  FIG. 2 is an explanatory view showing an example of a cross section of the device 1 cut in the longitudinal direction (the direction indicated by the arrow X shown in FIGS. 1 and 2). 1 and 2, the arrow X indicates the direction in which the gas to be processed flows through the apparatus 1.

  The apparatus 1 is used for processing gas such as gas purification. That is, the present apparatus 1 is used, for example, to remove harmful substances and / or particles contained in a gas. Specifically, the apparatus 1 is an exhaust gas processing apparatus that purifies exhaust gas, for example. In this case, the present apparatus 1 is provided in a vehicle such as an automobile in order to remove harmful substances and / or particles contained in exhaust gas discharged from an internal combustion engine (gasoline engine, diesel engine, etc.).

  That is, this apparatus 1 is a catalytic converter used for removing harmful substances contained in exhaust gas in a vehicle such as an automobile. Moreover, this apparatus 1 is DPF used in order to remove the particle | grains contained in the exhaust gas of a deal engine, for example.

  The processing structure 20 is a structure having a function of processing a gas. That is, when the present apparatus 1 is a catalytic converter, the processing structure 20 is a catalyst carrier having a catalyst for purifying gas and a carrier for carrying the catalyst. The catalyst is a catalyst for removing harmful substances (carbon monoxide, hydrocarbons, nitrogen oxides, etc.) contained in a gas such as exhaust gas. More specifically, the catalyst is a metal catalyst such as a noble metal catalyst (for example, a platinum catalyst). The carrier for supporting the catalyst is, for example, a cylindrical molded body (for example, a cylindrical honeycomb-shaped molded body) made of an inorganic material (for example, ceramics such as cordierite).

  Further, when the apparatus 1 is an apparatus for removing particles contained in a gas such as DPF, the processing structure 20 is a porous body (for example, a filter) that captures the particles in the gas. It is a structure which has. In this case, the processing structure 20 may further include a catalyst or may not include a catalyst.

  The casing 30 is a metal cylindrical body in which a space capable of accommodating the processing structure 20 is formed. Although the metal which comprises the casing 30 is not specifically limited, For example, it is good also as selecting from the group which consists of stainless steel, iron, and aluminum.

  The casing 30 may be, for example, a cylindrical body that can be divided into two along the longitudinal direction of the apparatus 1 or may be an integral cylindrical body that is not divided. In the example shown in the present embodiment, the casing 30 is an integral cylindrical body.

  The holding material 10 is used to hold the processing structure 20 in the casing 30. In other words, the holding material 10 is pressed into the gap between the casing 30 and the processing structure 20 to stably hold the processing structure 20 in the casing 30.

  The holding material 10 is still purified, for example, with the function of safely holding the processing structure 20 so as to avoid the processing structure 20 from colliding with the casing 30 and being damaged by vibration or the like in the apparatus 1. It is required to have a function of sealing the gap so that no gas leaks downstream from the gap between the processing structure 20 and the casing 30. In addition, when a high-temperature gas (for example, 200 to 900 ° C.) such as exhaust gas flows in the apparatus 1, the holding material 10 is required to have heat resistance and heat insulation.

  For this reason, the holding material 10 is a molded body made of inorganic fibers. That is, the holding material 10 contains an inorganic fiber as a main component. Specifically, the holding material 10 contains 90 mass% or more of inorganic fibers, for example. In addition, as for inorganic fiber, it is good also as using what was heat-processed (baking process) previously. By heat-treating the inorganic fiber in advance, the heat resistance of the inorganic fiber can be improved. The holding material 10 may include a binder (an organic binder and / or an inorganic binder) in addition to the inorganic fiber, and may include a binder and / or a filler.

  The shape of the holding material 10 is not particularly limited as long as the processing structure 20 can be held in the casing 30. That is, the holding material 10 may be, for example, a plate-like body (film, sheet, blanket, mat, etc.) or a cylindrical body.

  The one end and the other end of the plate-shaped holding material 10 may be formed in a corresponding shape that can be fitted. That is, in the example shown in FIG. 1, one end and the other end of the holding material 10 are respectively formed in a corresponding convex shape and concave shape, and one end of the holding material 10 disposed on the outer periphery of the processing structure 20. The other end is fitted.

  The method for producing the inorganic fiber molded body constituting the holding material 10 is not particularly limited, and either a wet method or a dry method can be used. That is, this molded body is manufactured by, for example, dehydration molding. In this case, first, an inorganic fiber for forming the holding material 10 and an organic binder (for example, rubber, water-soluble organic polymer compound, thermoplastic resin, thermosetting, in a dehydrating mold having a predetermined shape. An aqueous slurry containing a resin or the like. Then, by performing dehydration molding, an inorganic fiber molded body (wet molded body) having a shape corresponding to the shape of the mold is obtained. Furthermore, this wet molded body is compressed so that properties such as its bulk density and / or basis weight are within a desired range, and dried to finally obtain a molded body made of inorganic fibers.

  In addition, the inorganic fiber molded body constituting the holding material 10 may be manufactured, for example, by a dry method in which the collected inorganic fibers are needle processed. That is, in this case, the inorganic fiber molded body is produced as, for example, a so-called blanket, needle mat, or sewing mat.

  And it is good also as using the molded object made from the inorganic fiber manufactured with the wet method or the dry method as the holding material 10 as it is. Moreover, by using this inorganic fiber molded body as a base member and laminating a fiber sheet (woven fabric or nonwoven fabric composed of organic fibers and / or inorganic fibers) on the base member, the outer surface 11 You may manufacture the holding material 10 by which all or one part was covered with the said fiber sheet.

  The apparatus 1 is assembled by disposing the processing structure 20 and the holding material 10 in the casing 30. That is, for example, first, the holding material 10 is disposed on the outer periphery of the processing structure 20 to produce an assembly including the processing structure 20 and the holding material 10. Specifically, when the holding material 10 is plate-shaped, the holding material 10 is wound around the outer periphery of the processing structure 20 to produce an assembly. Further, when the holding material 10 is cylindrical, the assembly is manufactured by inserting the processing structure 20 into the inner space of the holding material 10.

  This assembly is then placed in the casing 30. That is, when the casing 30 is an integral type that cannot be divided, the assembly is press-fitted into the casing 30 from an opening at one end in the longitudinal direction of the casing 30 (so-called stuffing method). On the other hand, when the casing 30 can be divided, the assembly is sandwiched between a part of the divided casing 30 and another part, and then the casing 30 is integrated (a so-called clamshell method). This integration is performed, for example, by using a fastening member such as a bolt and a nut and / or welding.

  And in the gas processing method (henceforth "this method") concerning this embodiment, gas is processed using this device 1 as mentioned above. That is, the gas to be processed is processed by circulating the gas in the processing structure 20 of the apparatus 1.

  Specifically, in the present apparatus 1 shown in FIGS. 1 and 2, a gas such as exhaust gas flows from one end of the casing 30 in the direction indicated by the arrow X, and the gas circulates inside the processing structure 20. During this time, the purified and purified gas flows out of the apparatus 1 from the other end of the casing 30.

  In addition, at one end and the other end of the apparatus 1 disposed in a vehicle such as an automobile, a pipe for guiding a gas such as exhaust gas from the upstream side to the apparatus 1 and a purified gas downstream from the apparatus 1 are provided. The pipes leading to are respectively connected.

  Next, details of the present embodiment will be described. In the gas processing apparatus, as technical means for increasing the force (holding force) for holding the processing structure 20 in the casing 30, technical means for increasing the frictional resistance between the casing 30 and the holding material 10, And / or technical means for increasing the pressing force (vertical drag) due to the radial expansion of the holding material 10 can be considered.

  In this regard, the inventors of the present invention focused on the pressing force by the holding material 10. That is, at the time of canning in which the holding material 10 is inserted into the casing 30, the holding material 10 is inserted into the casing 30 in a compressed state. For this reason, after the insertion of the holding material 10 into the casing is completed (after completion of canning), the holding material 10 expands in the casing 30. As a result, the holding material 10 presses the processing structure 20 radially inward and the casing 30 radially outward in the casing 30. Therefore, if the pressing force by the holding material 10 can be increased, the holding force in the gas processing apparatus can be increased.

  Therefore, the inventors of the present invention have made extensive studies, and as a result, during the canning, the holding material 10 is compressed and the outer surface 11 of the casing 30 is in contact with the inner surface 31 of the casing 30. And the treatment structure 20, the inorganic fibers constituting the holding material 10 are damaged, and the damage reduces the expansion of the holding material 10 after canning, and as a result, The original knowledge that the pressing force by the holding material 10 is also reduced was obtained.

  And inventors reduce the damage at the time of canning of the inorganic fiber which comprises the holding material 10, and increase the pressing force by the said holding material 10 after canning effectively, As a result, in gas processing apparatus We have found that we can effectively increase the holding power.

  The present device 1 based on such inventors' unique knowledge is, for example, per unit area of the holding material 10 at the time when 24 hours or more have elapsed from the time when the insertion of the holding material 10 into the casing 30 is completed. The ratio of the holding force to the holding force when the time within 5 minutes has elapsed from the completion time (hereinafter referred to as “holding force recovery rate”) is 120% or more.

  That is, in the manufacture of the apparatus 1, the holding force F1 is measured when a time within 5 minutes has elapsed from the time when canning is completed, and then held when a time of 24 hours or more has elapsed from the time when the canning is completed. When the force F2 is measured, the holding force recovery rate, which is the ratio (F2 / F1 × 100) of the latter holding force F2 to the former holding force F1, is 120% or more.

  In the present apparatus 1, the holding force recovery rate may be, for example, 125% or more, or 130% or more. The upper limit value of the holding force recovery rate is not particularly limited, but the holding force recovery rate may be, for example, 300% or less.

  The time when the canning is completed is, for example, the time when the holding material 10 is arranged at a predetermined position in the casing 30 where the holding material 10 is finally arranged in the apparatus 1.

  In addition, the time when the time within 5 minutes has elapsed from the time when the canning is completed is not particularly limited as long as the time within the range of 0 to 5 minutes has elapsed from the time when the canning is completed. It may be a time when a time within a range of ˜5 minutes has elapsed.

  In addition, the time when 24 hours or more have elapsed since the completion of canning is not particularly limited as long as the time of 24 hours or more has elapsed since the completion of canning. For example, 24 to 200 hours after the completion of canning It may be the time when the time within the range has elapsed, may be the time when the time within the range of 24 to 100 hours has elapsed from the time when the canning is completed, and may be 50 to 100 hours after the time when the canning is completed. It may be the time when the time within the range has elapsed.

The holding force (N / cm ² ) per unit area of the holding material 10 is the holding force per unit area of the outer surface 11 of the holding material 10. That is, in this apparatus 1, when the processing structure 20 is pushed in the longitudinal direction in the present apparatus 1, the maximum value (N) of the force required to drop the processing structure 20 from the casing 30 is determined as the holding material. It is calculated by dividing by 10 area (cm ² ) of the outer surface 11.

  The maximum value of the force required to drop the processing structure 20 from the casing 30 is determined by the processing structure 20 in the casing 30 when the processing structure 20 is pushed in the longitudinal direction. It is the maximum value of the force pushing the processing structure 20 measured until it starts to move in the longitudinal direction.

The bulk density of the holding material 10 in the apparatus 1 may be, for example, 0.15 to 0.7 g / cm ³ , 0.20 to 0.50 g / cm ³ , or 0. It may be 25 to 0.50 g / cm ³ .

The bulk density of the holding material 10 may be a relatively high predetermined range. That is, the bulk density of the holding member 10 is, for example, 0.35 g / cm ³ or more, may be 0.45 g / cm ³ or less (0.35~0.45g / cm ^3). In this case, the bulk density of the holding material 10 may be, for example, 0.37 g / cm ³ or more, may be 0.39 g / cm ³ or more, and is 0.40 g / cm ³ or more. It is good as well.

  Here, the holding force tends to increase as the bulk density of the holding material 10 increases. However, if the bulk density of the holding material 10 is too large, for example, it becomes difficult to insert the holding material 10 into the casing 30, and the weight of the gas treatment device becomes too large. Inconveniences such as an increase in the amount of fibers and an increase in the degree of damage during canning of the inorganic fibers constituting the holding material 10 occur.

  In this regard, when the bulk density of the holding material 10 is in the above-described range, the apparatus 1 can exhibit a sufficient holding force while effectively avoiding the above-described disadvantages.

  In addition, the inorganic fibers constituting the holding material 10 are not particularly limited, but may be, for example, silica fibers or alumina fibers. That is, this apparatus 1 is good also as providing the holding material 10 made from a silica fiber, or the holding material 10 made from an alumina fiber.

The silica fiber is an amorphous fiber or a polycrystalline fiber mainly composed of silica (SiO ₂ ). The silica fiber may be, for example, an inorganic fiber containing 90% by mass or more of silica. The content of silica in the silica fiber may be, for example, 93% by mass or more, 96% by mass or more, and 97% by mass or more. The silica fiber may be preheated (baked). By heat-treating the silica fiber in advance, the heat resistance of the silica fiber can be improved. That is, for example, when the silica fiber is one obtained by removing the alkali component by subjecting the glass fiber to an acid treatment and enhancing the silica component, the silica fiber is heated to treat the fine particles produced by the acid treatment. A void is filled by the heat shrinkage of the silica fiber, and the heat resistance can be improved.

When the holding material 10 is made of silica fiber, in the present apparatus 1, for example, the bulk density of the holding material 10 is 0.35 g / cm ³ or more and the holding force recovery rate is 125% or more. Alternatively, the holding material 10 may have a bulk density of 0.40 g / cm ³ or more and a holding power recovery rate of 130% or more.

The alumina fiber is a polycrystalline fiber mainly composed of alumina (Al ₂ O ₃ ). The alumina fiber may contain, for example, 70% by mass or more of alumina. The content of alumina in the alumina fiber may be, for example, 80% by mass or more, may be 90% by mass or more, may be 95% by mass or more, and is 96% by mass or more. It is good as well.

In the case where the holding material 10 is made of alumina fiber, in this device 1, for example, the bulk density of the holding material 10 is 0.35 g / cm ³ or more or 0.40 g / cm ³ or more, and the holding force recovery rate is May be 125% or more.

  Silica fibers are considered to be susceptible to damage during canning while expected to increase retention due to their relatively high stiffness. For this reason, conventionally, when the holding material 10 is made of silica fiber, even if the bulk density of the holding material 10 is increased, the holding force cannot always be effectively increased. The same tendency was observed when the holding material 10 was made of alumina fiber.

  In this regard, as described above, the inventors of the present invention effectively increase the pressing force by the holding material 10 after the completion of canning by reducing the damage during the canning of the inorganic fibers constituting the holding material 10. As a result, it has been found uniquely that the holding force in the gas processing apparatus can be effectively increased.

  In addition, reduction of the damage at the time of canning of the inorganic fiber which comprises the holding material 10 is performed by reducing the frictional resistance of the holding material 10 and the casing 30 at the time of canning, for example. That is, for example, canning is performed using a lubricant. Specifically, for example, a lubricant is applied to the outer surface 11 of the holding material 10 and / or the inner surface 31 of the casing 30 to perform canning. The lubricant is not particularly limited, and may be, for example, a liquid lubricant (for example, water, an aqueous solution containing a surfactant). In this case, after the canning, the liquid lubricant is dried and / or solidified. The method for reducing the frictional resistance between the holding material 10 and the casing 30 during canning is not limited to the use of a lubricant as long as the frictional resistance can be reduced. For example, the above-described inorganic fiber molded body is used. As a fiber sheet to be laminated on the base member made of, a method using a material that reduces the frictional resistance (for example, a woven fabric or a non-woven fabric preferably made of organic fibers), or the outer surface 11 of the holding material 10, A method of applying a fluorine coating that reduces frictional resistance can be mentioned.

In addition, regardless of whether or not the device 1 exhibits the holding force recovery rate as described above, for example, the holding material 10 is made of silica fiber, and the bulk density of the holding material 10 is 0.35 g / cm ³ or more and 0.45 g / cm ³ or less, and the holding force per unit area of the holding material 10 may be 6.00 N / cm ² or more. In this case, the holding force may be, for example, 6.10 N / cm ² or more.

In addition, regardless of whether or not the device 1 exhibits the holding force recovery rate as described above, for example, the holding material 10 is made of alumina fiber, and the bulk density of the holding material 10 is 0.35 g / cm ³ or more and 0.45 g / cm ³ or less, and the holding force per unit area of the holding material 10 may be 4.15 N / cm ² or more. In this case, the holding force may be, for example, 4.20 N / cm ² or more.

  That is, the inventors of the present invention, as a result of intensive studies, particularly when the inorganic fibers constituting the holding material 10 are canned when the bulk density of the holding material 10 is in a relatively high range as described above. It was found uniquely that the pressing force by the holding material 10 after canning can be effectively increased by reducing the damage in the gas, and as a result, the holding force in the gas processing apparatus can be effectively increased.

Also in these cases, the bulk density of the holding material 10 may be, for example, 0.37 g / cm ³ or more, 0.39 g / cm ³ or more, and 0.40 g / cm ^3. It is good also as being above.

That is, in the present apparatus 1, for example, the bulk density of the silica fiber holding material 10 may be 0.40 g / cm ³ or more and the holding force may be 6.10 N / cm ² or more. Further, in the present apparatus 1, for example, the bulk density of the holding material 10 made of alumina fiber may be 0.40 g / cm ³ or more and the holding force may be 4.15 N / cm ² or more.

In addition, the device 1 may further have the above-described holding force recovery rate. That is, the present device 1, for example, the holding member 10 is made of silica fibers, the bulk density of the holding member 10 is 0.35 g / cm ³ or more and 0.45 g / cm ³ or less, the holding member The holding force per unit area of 10 may be 6.00 N / cm ² or more, and the holding force recovery rate may be 120% or more.

In this case, in the present apparatus 1, for example, the bulk density of the silica fiber holding material 10 may be 0.35 g / cm ³ or more and the holding power recovery rate may be 125% or more. The bulk density of the material 10 may be 0.40 g / cm ³ or more, and the holding power recovery rate may be 130% or more.

Further, the apparatus 1 is, for example, the holding member 10 is made of alumina fibers, the bulk density of the holding member 10 is 0.35 g / cm ³ or more and 0.45 g / cm ³ or less, the holding member The holding force per unit area of 10 may be 4.15 N / cm ² or more, and the holding force recovery rate may be 120% or more.

In this case, in this device 1, for example, the bulk density of the holding material 10 made of alumina fiber is 0.35 g / cm ³ or more or 0.40 g / cm ³ or more, and the holding force recovery rate is 125% or more. It may be there.

  Note that the holding force recovery rate of the device 1 and the bulk density and holding force of the holding material 10 described above are measured before the device 1 is exposed to a temperature of 90 ° C. or higher. That is, when the holding material 10 is manufactured including an organic binder, the holding force recovery rate of the apparatus 1, the bulk density and holding force of the holding material 10 are, for example, that the holding material 10 is 90 ° C. or higher. It is measured before the organic binder is burned out by being exposed to a temperature (for example, before being exposed to a temperature of 90 ° C. or higher or a temperature of 150 ° C. or higher for 1 minute or longer). In addition, when the apparatus 1 is used for processing a gas having a temperature of 90 ° C. or higher, the holding force recovery rate of the apparatus 1, the bulk density and the holding force of the holding material 10 are, for example, those of the apparatus 1. It is measured before starting the processing of the gas (before starting the flow of the gas to the apparatus 1). Of course, this apparatus 1 is good also as exposing to the temperature of 90 degreeC or more after the manufacture.

  Next, specific examples according to the present embodiment will be described.

[Manufacture of retaining material]
A holding material 10 made of inorganic fibers was produced by a wet method. As inorganic fibers, silica fibers (97% by mass of silica, 3% by mass of alumina) or alumina fibers (96% by mass of alumina, 4% by mass of silica) were used.

  That is, in Example 1, an aqueous slurry containing silica fibers as a main component and added with an organic binder (acrylic resin) and an inorganic binder (alumina sol, silica sol, etc.) is prepared, and the aqueous slurry is subjected to dehydration molding. Thus, the silica fiber holding material 10 was manufactured.

In addition, in order to change the bulk density of the holding material after canning as described later, a plurality of mat-like holding materials having different bulk densities (bulk density: 1100 to 1600 g / cm ³ , size: 375 mm × 80 mm, thickness 8 to 10 mm).

Further, in Example 2, a mat-like alumina fiber having a bulk density of 1682 g / cm ³ in the same manner as in Example 1 except that alumina fiber was used instead of silica fiber as the inorganic fiber. A manufactured holding material 10 (size: 375 mm × 80 mm, thickness 10.1 mm) was manufactured.

[Manufacture of gas processing equipment]
The apparatus 1 including a ceramic processing structure 20 having an outer diameter of 110 mm, a holding material 10 manufactured as described above, and a stainless steel casing 30 having an inner diameter of 118 mm. Manufactured.

  That is, first, an assembly was produced by winding the mat-shaped holding material 10 around the outer peripheral surface of the processing structure 20. Next, a lubricant composed of an aqueous solution containing a surfactant was applied to the entire outer surface 11 of the holding material 10. And the assembly was inserted from the longitudinal direction one end of the casing 30 in the state which the holding material 10 compressed, and this apparatus 1 was manufactured. In Example 1, four types of the apparatus 1 having different bulk densities of the holding material 10 after canning were manufactured by using the holding materials 10 having different thicknesses.

[Evaluation of holding power and recovery rate]
Using a test apparatus 40 as shown in FIG. 3, the holding force after canning was evaluated. The test apparatus 40 includes an extrusion jig 41 that is a stainless steel disc placed on one end surface in the longitudinal direction (the direction in which gas flows) of the processing structure 20, and the extrusion jig 41. And a rod-like push rod 42 for pushing the processing structure 20 to the other side in the longitudinal direction (the lower side in FIG. 3).

In the manufacture of the apparatus 1 described above, when one minute has elapsed from the time when the canning is completed, the processing structure 20 is started to be pushed in the longitudinal direction by the push rod 42 via the extrusion jig 41, and the processing is performed. The maximum value of the load required until the structure 20 began to move in the casing 30 was measured as the extrusion load (N). Further, the holding force (N / cm ² ) per unit area of the holding material 10 is calculated by dividing the measured extrusion load (N) by the area (cm ² ) of the outer surface 11 of the holding material 10. did.

Thereafter, the extrusion load (N) was similarly measured and the holding force (N / cm ² ) was calculated when 50 to 100 hours had elapsed from the time when the canning was completed. Then, the ratio of the holding force when 50 to 100 hours have elapsed from the time when canning is completed to the holding force when 1 minute has elapsed from the time when the canning is completed is calculated as a holding force recovery rate (%). did.

  In addition, as a comparison target, a gas treatment device was manufactured in the same manner except that no lubricant was used during canning, and the holding power and the recovery rate of the gas treatment device were evaluated.

[result]
FIGS. 4 and 5 show the holding power recovery rate (%) and the completion of the canning for each of a plurality of gas processing devices having different bulk densities (g / cm ³ ) of the holding material in Example 1 and Comparative Example 1, respectively. The result of having evaluated the retention strength (N / cm < ² >) at the time of 50 to 100 hours having passed since is shown. FIG. 6 shows the results of evaluating the holding power recovery rate (%) and the holding power (N / cm ² ) when 50 to 100 hours have elapsed from the completion of canning in Example 2 and Comparative Example 2.

7 and 8 show the correlation between the bulk density of the holding material, the holding force recovery rate, and the holding force, respectively. The horizontal axis of FIGS. 7 and 8 indicates the bulk density (g / cm ³ ) of the holding material, the vertical axis of FIG. 7 indicates the holding force recovery rate (%), and the vertical axis of FIG. The holding power (N / cm ² ) when 100 hours have elapsed is shown. 7 and 8, black circles indicate the results of Example 1, white circles indicate the results of Comparative Example 1, black triangles indicate the results of Example 2, and white dots. Triangle marks indicate the results of Comparative Example 2.

As shown in FIGS. 4, 5, and 7, when the holding material is made of silica fiber, the holding power recovery of Comparative Example 1 is performed in the range where the bulk density of the holding material is 0.27 to 0.43 g / cm ^3. The rate was 111% or less, whereas the holding power recovery rate of Example 1 was significantly larger than that of Comparative Example 1, 121% or more.

As shown in FIGS. 4, 5, and 8, in Comparative Example 1, the holding force is 5.94 N in the range where the bulk density of the holding material is 0.27 to 0.43 (g / cm ³ ). / cm ² in which was whereas below, in example 1, the holding force when the bulk density of the holding material 0.30 g / cm ³ greater than (0.39 g / cm ³ or higher) is 6.01N / cm ² or more, further, the bulk density of the holding member holding force when the 0.39 g / cm ³ greater than (0.43g / cm ³⁾ is 8.22N / cm ^2, was significantly higher.

Here, as shown in FIG. 8, in both Example 1 and Comparative Example 1, there is a tendency for the holding force to increase as the bulk density of the holding material increases. In the range of 0.35 to 0.45 g / cm ^3, a large holding force that cannot be achieved in Comparative Example 1 was achieved only in Example 1. This large holding force that was not achieved in the past was considered to be due to the reduction in silica fiber damage during canning in Example 1.

Further, as shown in FIGS. 6 and 7, even when the holding material is made of alumina fiber, the holding power recovery rate of Comparative Example 2 was 115%, whereas the holding power recovery rate of Example 2 was It was significantly larger than that of Comparative Example 2 and was 126%. Moreover, as shown in FIG. 6, the holding force in Comparative Example 2 was 4.07 N / cm ² , while the holding force in Example 2 was 4.27 N / cm ² or more. The large holding force in Example 2 was also thought to be due to the reduced damage of the alumina fibers during canning.

  DESCRIPTION OF SYMBOLS 1 Gas processing apparatus, 10 Holding material, 11 Outer surface, 20 Processing structure, 30 Casing, 31 Inner surface, 40 Test apparatus, 41 Extrusion jig, 42 Push rod.

Claims (9)

A processing structure;
A metal casing that houses the processing structure;
A gas processing apparatus comprising: a holding material disposed between the processing structure and the casing;
The holding material is made of silica fiber,
The bulk density of the holding material, 0.35 g / cm ³ or more and 0.45 g / cm ³ or less,
The gas processing apparatus, wherein the holding force per unit area of the holding material is 6.00 N / cm ² or more. A processing structure;
A metal casing that houses the processing structure;
A gas processing apparatus comprising: a holding material disposed between the processing structure and the casing;
The holding material is made of alumina fiber,
The bulk density of the holding material, 0.35 g / cm ³ or more and 0.45 g / cm ³ or less,
The gas processing apparatus, wherein the holding force per unit area of the holding material is 4.15 N / cm ² or more. The holding force when the time of 24 hours or more has elapsed from the time when the insertion of the holding material into the casing is completed, with respect to the holding force when the time within 5 minutes has elapsed from the time when the insertion is completed. The gas processing apparatus according to claim 1, wherein the ratio is 120% or more. A processing structure;
A metal casing that houses the processing structure;
A gas treatment device comprising: an inorganic fiber holding material disposed between the treatment structure and the casing;
When the holding force per unit area of the holding material at the time when the time of 24 hours or more has elapsed from the time when the insertion of the holding material into the casing is completed, the time within 5 minutes from the completion time The gas processing apparatus according to claim 1, wherein a ratio with respect to the holding force is 120% or more. The bulk density of the holding material, 0.35 g / cm ³ or more, the gas processing apparatus according to claim 4, characterized in that at 0.45 g / cm ³ or less. The gas processing apparatus according to claim 4, wherein the inorganic fibers are silica fibers or alumina fibers. The holding material is made of silica fiber,
The bulk density of the holding material, 0.35 g / cm ³ or more and 0.45 g / cm ³ or less,
The gas processing apparatus according to claim 4, wherein a holding force per unit area of the holding material is 6.00 N / cm ² or more. The holding material is made of alumina fiber,
The bulk density of the holding material, 0.35 g / cm ³ or more and 0.45 g / cm ³ or less,
The gas processing apparatus according to claim 4, wherein a holding force per unit area of the holding material is 4.15 N / cm ² or more. The gas processing method characterized by processing gas using the gas processing apparatus in any one of Claims 1 thru | or 7.

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