JPH08224482A - Catalyst for purifying waste gas, catalyst unit and cooking tool - Google Patents

Abstract

PURPOSE: To provide a catalyst for purifying waste gas rapid in temp. rising, improved in contact efficiency with the waste gas and high in waste gas purifying performance. CONSTITUTION: The catalyst for purifying waste gas is constituted so as to carry the catalyst on a lath net 1 of a corrugated catalyst carrier having a larger height H than pitch P and the dimension (d) between the outer diameter of the crests is made equal or more the dimension of the gap (e) between the crests. The catalyst efficiently purifies the waste gas by making the flow of the waste gas turbulent to increase the contact frequency with the catalyst.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying catalyst for removing cooking odor, oily smoke and the like generated during cooking, and a cooker using the exhaust gas purifying catalyst.

[0002]

2. Description of the Related Art Conventionally, in order to remove cooking odor and oily smoke of a cooker, a honeycomb-shaped oxidation catalyst using a ceramics carrier is arranged on the main body of the cooker, and this oxidation catalyst is used for exhaust heat of the cooker. The method is used to oxidize and decompose odorous components.

[0003]

However, in the above-mentioned conventional method, since the oxidation catalyst has a large heat capacity, it takes a long time for the oxidation catalyst to reach the decomposition temperature of the odorous components. Further, since the honeycomb shape is used, when the thickness is thin, the exhaust gas passes through without contacting the catalyst. That is, the exhaust gas purifying ability also has a problem.

The present invention solves the problems of such conventional methods. The catalyst temperature rises quickly, the contact efficiency between the exhaust gas and the catalyst is increased, and the exhaust gas purifying catalyst has a high exhaust gas purifying ability. The primary purpose is to provide.

Further, in addition to the first object, a second object is to provide an exhaust gas purifying catalyst which is easy to assemble when incorporated in equipment.

In addition to the first object, a third object is to provide an exhaust gas purifying catalyst having a higher exhaust gas purifying ability and a higher mechanical strength.

A fourth object is to provide a second means for achieving the third object.

A fifth object is to provide a second means for achieving the second object.

A sixth object is to provide a cooker with improved exhaust gas purification performance.

[0010]

[Means for Solving the Problems] A first means of the present invention for achieving the first object is to carry a catalyst on a catalyst carrier composed of a lath net processed into a corrugated plate shape, wherein the corrugated plate comprises: The exhaust gas-purifying catalyst has a height larger than the pitch and an outer diameter of the crests which is equal to or larger than a size of a gap between the crests.

A second means of the present invention for attaining the second object is to process a lath net punched into a shape such that four corners have circular arcs when processed into a corrugated plate shape into a corrugated plate shape. The catalyst is used as a catalyst carrier, and the surface of the catalyst carrier carries a catalyst for exhaust gas purification.

A third means of the present invention for achieving the third object comprises supporting a catalyst on a catalyst carrier formed by alternately laminating a lath net processed into a corrugated plate shape and punching plates. It is used as an exhaust gas purifying catalyst.

The fourth means of the present invention for achieving the fourth object is to purify exhaust gas by carrying a catalyst on a catalyst carrier which is formed by laminating lath nets with the latitudinal direction shifted by 90 °. It is used as a catalyst.

A fifth means of the present invention for achieving the fifth object is to install a metal band on the end portion of the exhaust gas purifying catalyst constituting the fourth means according to the first means of the present invention. The formed catalyst unit is used.

Furthermore, a sixth means of the present invention for achieving the sixth object is a cooker in which the catalyst unit constituting the fifth means of the present invention is provided in the exhaust gas passage.

[0016]

The first means of the present invention is a lath which is a corrugated plate-like catalyst carrier having a height larger than the pitch and an outer diameter of the crests being equal to or larger than a clearance between the crests. An exhaust gas purifying catalyst in which a catalyst is carried on a net makes the flow of exhaust gas a turbulent flow, has a high contact frequency with the catalyst, and purifies exhaust gas efficiently.

The second means of the present invention is to process a lath net punched into a shape such that four corners can be rounded when processed into a corrugated plate shape into a corrugated plate shape to serve as a catalyst carrier, which is to be incorporated in a device. It can be easily mounted in place.

A third means of the present invention is a catalyst carrier in which a lath net processed into a corrugated plate shape and punching plates are alternately laminated, so that the contact frequency between the exhaust gas and the catalyst is further increased and the exhaust gas is highly purified. It acts as a catalyst for the vehicle.

The fourth means of the present invention is to set the direction of lath to 9
The catalyst carrier laminated in the form of being shifted by 0 ° enhances the contact efficiency between the exhaust gas and the catalyst and prevents the uneven flow of the exhaust gas.

The fifth means of the present invention is to provide a catalyst unit whose outer dimensions can be defined and which is easy to handle by fitting a metal band to the end of the exhaust gas purifying catalyst.

[0021] A sixth means of the present invention is to arrange a catalyst unit, which constitutes the fifth means of the present invention, in an exhaust gas passage to provide a cooker capable of effectively purifying oil smoke and cooking odor.

[0022]

【Example】

(Embodiment 1) Hereinafter, an exhaust gas purifying catalyst according to a first embodiment of the present invention will be described with reference to FIG. FIG.
(A) is an explanatory view showing a constitution of a catalyst carrier of the present embodiment. The exhaust gas purifying catalyst of the present embodiment is configured by using the corrugated plate-shaped lath net 1 as a catalyst carrier and supporting the catalyst thereon. The shape of the corrugated plate of the lath net 1 is such that the height H is larger than the pitch P, and the dimension d of the outer diameter of the crests is equal to or larger than the dimension e of the clearance between the crests. The shape of the mesh of the lath net 1 can be set arbitrarily, but in this embodiment, a shape obtained by extending a cut of 3 mm pitch by 1.5 mm is used. The material of the lath net 1 has a plate thickness of 10 μm to 3 μm.
A BA annealed product of Fe-Cr-Al heat-resistant steel (equivalent to SUH-21) of 00 μm is used. The catalyst supported on the oxide film formed on the surface of the lath mesh 1 is Fe-Ni.
-Cr heat resistant steel, Incoloy 800 or equivalent, Inconel 600 or equivalent, austenitic heat resistant stainless steel such as SUS309 or SUS310, and ferritic stainless steel having excellent corrosion resistance such as SUS444 are suitable.

The method for producing the exhaust gas purifying catalyst of this embodiment will be described below. A corrugated sheet using a lath net that has been generally used conventionally has a shape as shown in FIG. That is, the height H of the wave is equal to the pitch P of the wave.
It is smaller than that. When such a lath net is used as a catalyst carrier, the contact efficiency between the exhaust gas and the catalyst is very poor. In this respect, the lath net 1 used in this embodiment has a height H as described above.
Is larger than the pitch P, and the dimension d of the outer diameter of the crests is equal to or larger than the dimension e of the clearance between the crests. That is, H = 5 mm, d = 2 mm, e = 0.5 mm, P = 2.5 mm. Lath net 1 shaped into this shape is
The temperature is set to 900 to 1100 ° C., and it is left for 30 to 60 minutes in an atmosphere furnace filled with about 90% of an inert gas, about 10% of a reducing gas and a very small amount of oxygen. That is, an oxide film is formed on the surface. When the formation of the oxide film is completed, the lath net 1 is naturally cooled to support the catalyst on the oxide film.

The method of supporting this catalyst will be described below. The catalyst of this example is composed of γ-alumina (alumina sol)
Α-alumina particles around 20 μm as solid content, 1 to
The mixture used in the ratio of 3: 9 to 7 is used as a wash coat. This wash coat is 30 ~
The lath net 1 is coated so as to have a film thickness of about 40 μm, dried, and then baked at 500 to 600 ° C. for 15 to 30 minutes. Further, after the catalyst support after washcoat baking is naturally cooled, organoplatinic acid is applied and adjusted so that the amount of platinum supported is 1 g / l, dried, and dried at 500 to 600 ° C for 15 to 30 ° C. Bake for minutes. Thus, the loading of the catalyst is completed.

The experimental results of the exhaust gas purifying ability of the exhaust gas purifying catalyst of this example will be reported below. This experiment is measured using the exhaust gas purification capacity measurement test device shown in FIG. The BK exhaust gas purification capacity measurement test equipment is
The main body unit 10, an exhaust gas supply unit 11 that supplies exhaust gas to the main body unit 10, and a measurement unit 12 that measures the concentration of the exhaust gas. The body 10 has a heat insulating material 10a around the periphery.
A container 10b surrounded by is provided, and the sample exhaust gas purifying catalyst 13 is housed in the container 10b. The lower portion of the container 10b receives the exhaust gas from the exhaust gas supply unit 11. The exhaust gas supply unit 11 includes a gas cylinder 11a for supplying exhaust gas, a flow rate adjusting valve 11b attached to the gas cylinder 11a, a blower 11c for adjusting the concentration of the exhaust gas to be supplied, and a flow rate adjusting valve 11d attached to the blower 11c, and a temperature. The heater unit 11f is provided for heating the temperature of the test exhaust gas purifying catalyst 13 to a predetermined temperature from the temperature detected by the detector 11e. The measuring unit 12 switches and measures the gas sucked from the pipe connected to the front stage and the pipe connected to the rear stage of the test exhaust gas purification catalyst 13 housed in the main body unit 10 by the switching valve 12b.
a.

In the present experiment, propane gas was used as exhaust gas at a concentration of 1000 ppm at SV = 15000 hr ⁻¹ by the above apparatus.

The results of this experiment are shown in FIG. In FIG. 3, a shows the characteristics of this example, and c shows the characteristics of a conventional honeycomb-shaped oxidation catalyst using a ceramic carrier. As can be seen from FIG. 3, the conventional one fails to function when the temperature of the exhaust gas purifying catalyst is 250 ° C.
Therefore, only 20% purification rate is obtained. On the other hand, the one of this example starts to function at 200 ° C.
It reaches a peak at ℃. The purification rate at this peak is 98%. It is considered that this is because the structure of the exhaust gas purifying catalyst of this embodiment is the same as that shown in FIG. That is, the height H is larger than the pitch P,
This is because the lath net 1 processed into a corrugated plate shape in which the outer diameter d of the crests is equal to or larger than the dimension e of the gap between the crests is used as the catalyst carrier. With this configuration,
The flow of the exhaust gas flowing through the exhaust gas purifying catalyst becomes turbulent, the frequency of contact with the carried catalyst increases, and the exhaust gas purifying catalyst acts as a high-performance exhaust gas purifying catalyst.

In this embodiment, an oxide film is formed on the surface of the lath net 1 used as a catalyst carrier, and the catalyst is supported on the oxide film formed. However, this oxide film must be formed in particular. This does not mean that the carried catalyst may be directly carried on the lath net 1 as long as the carried catalyst does not peel off.

As described above, in this embodiment, the height H is larger than the pitch P, and the outer diameter d of the crests is processed into a corrugated plate shape having a dimension e greater than the clearance e between the crests. As a structure in which the catalyst is supported on the catalyst carrier composed of the lath net 1, the exhaust gas flow becomes a turbulent flow to increase the frequency of contact with the carried catalyst, thereby realizing an exhaust gas purifying catalyst with high performance.
Further, by adopting the configuration of this embodiment, the exhaust gas purifying catalyst has a small heat capacity, a rapid temperature rise, and excellent rising characteristics. Further, since the catalyst carrier is made of metal, an exhaust gas purifying catalyst that is strong against thermal shock and excellent in mechanical strength is realized.

(Second Embodiment) Next, a second embodiment of the present invention will be described. The exhaust gas purifying catalyst of this embodiment is shown in FIG.
The lath net 1 as shown in (a) is used. That is, the four corners are the predetermined arcuate portion 2a. The shape of the arcuate portion 2a is such that the four corners are the arcuate portions 2 when the exhaust gas purifying catalyst shown in FIG. A catalyst is carried on the lath net 1 in the same manner as in Example 1 to form an exhaust gas purifying catalyst.

With the above structure, when it is attached to the cooker 5 as shown in FIG. 5, it can be easily attached to a predetermined place. In other words, the exhaust port 5a of the cooking device 5 has arcuate portions at the four corners.

As described above, according to this embodiment, the exhaust gas purifying catalyst which can be easily assembled into the cooking device is realized by using the lath net having the four corners of the predetermined arcuate portions.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. The exhaust gas-purifying catalyst of this example uses, as a catalyst carrier, a stack of lath nets 1 and corrugated plates 1 and punching plates 3 that are alternately laminated as in Example 1. The loading of the catalyst is the same as in Example 1.

With the above structure, the exhaust gas purifying ability can be easily increased by increasing the number of laminated layers, and a durable exhaust gas purifying catalyst having high mechanical strength is realized.

(Embodiment 4) Next, an exhaust gas purifying catalyst according to a fourth embodiment of the present invention will be described. In this embodiment, as the catalyst carrier, flat lath nets are laminated with their latitudinal directions shifted by 90 °. The loading of the catalyst is the same as in Example 1.

As described above, according to the present embodiment, the catalyst carrier can be constructed by simply laminating flat lath nets, and an exhaust gas purifying catalyst having a required purifying ability can be realized very easily. Further, it is possible to prevent uneven flow of exhaust gas.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described. As shown in FIG. 7, in this embodiment, the exhaust gas purifying catalyst described in each of the above embodiments is integrated as a catalyst unit. That is, the edge portion of the exhaust gas purifying catalyst has a shape in which the metal band 8 is wound around the edge portion.

With the above constitution, the outer diameter dimension can be clearly defined, and therefore the handling is very easy, there is no injury at the end of the lath net, and the catalyst has improved mechanical strength. The unit can be realized.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described. The present embodiment relates to a cooker using the catalyst unit manufactured according to the fifth embodiment. As shown in FIG. 8, in this embodiment, a fish roaster is used as a cooking device. That is, the upper lid 15 forming the outer shell of the fish roaster is provided with an exhaust hole 16 for exhausting smoke generated from the food.
The lower portion of the exhaust hole 16 serves as an exhaust port 17 in which a catalyst unit 18 is provided. That is, the catalyst unit 18
Is provided in the exhaust path of the fish roaster. In addition, 19 is a saucer, 20 is water prepared in an appropriate amount in the saucer 19, and 21 is a fish which is a dish and is placed on the grill 22. 23 and 24 are an upper heater and a lower heater, respectively.

Exhaust gas purification experiments using the fish roaster of this embodiment will be described below. Water 20 is put in the pan 19 and preheated and energized for 5 minutes. Then grill 2
2 three sanma 21 are placed on the upper side, and the energization of the upper heater 23 and the lower heater 24 is started. In this embodiment, the upper heater 23
-The electric capacities of the lower heater 24 are set to 850W and 550W, respectively. About 5 minutes after the power is turned on, oil smoke is generated from the saury 21. Catalyst unit 1 at this time
The temperature of 8 reached 480 ° C. as shown in FIG. The peak of the generation of oily smoke is about 9 minutes after the start of energization. Therefore, the temperature of the catalyst unit 18 at this time exceeds 480 ° C., and the catalyst unit 18 is in a state of having a sufficient purification function. This experiment is 1
It's finished in 5 minutes. At this time, the measuring instrument used to obtain the exhaust gas purification performance is an HC meter (EHF-7C manufactured by Shimadzu Corporation). The honeycomb type shown in FIG. 9 is a conventional product.

Results of this experiment In the present embodiment, 95%
Is obtained. The HC purification rate of the conventional one was 64%. Further, as is clear from FIG. 9, the temperature rise of the catalyst unit 18 of this embodiment is
The temperature is about 100 ° C higher than that of the conventional honeycomb type. In other words, the cooker of the present embodiment has a large purification capability because the temperature of the catalyst unit rises quickly and purification of oil smoke and cooking odor can be started at an early point. Also, since the catalyst unit 18 used uses a lath net that is a metal porous body, it requires less metal, has a small heat capacity, and can be set at a high catalyst temperature, and the exhaust gas and the catalyst can be brought into contact with each other. Since it is carried out irregularly, the exhaust gas purification performance can be further improved.

Although an electric heater is used as the heating source in this embodiment, it can be applied to a cooking device using gas as a heat source.

[0043]

According to the first means of the present invention, the catalyst is supported on the catalyst carrier composed of a lath mesh processed into a corrugated plate shape, and the corrugated plate has a height larger than the pitch and a peak-to-peak shape. With the outer diameter dimension equal to or greater than the gap between the peaks, the temperature of the catalyst rises quickly and the contact efficiency between the exhaust gas and the catalyst is increased.
It is intended to realize an exhaust gas purifying catalyst having a high exhaust gas purifying ability.

The second means of the present invention is, in particular, that a lath net punched into a shape in which four corners have arcs when processed into a corrugated plate is processed into a corrugated plate to form a catalyst carrier, As a structure supporting a catalyst, an exhaust gas purifying catalyst that is easy to assemble when incorporated in a device is realized.

The third means of the present invention has a structure in which a catalyst is carried on a catalyst carrier formed by alternately laminating a lath net processed into a corrugated plate shape and punching plates, thereby further improving the exhaust gas purifying ability. The present invention realizes an exhaust gas purifying catalyst having high mechanical strength.

The fourth means of the present invention is a very simple structure in which the catalyst is carried on a catalyst carrier formed by laminating the lath nets by shifting the lath mesh direction by 90 °. It is intended to realize an exhaust gas purifying catalyst having high purifying ability and high mechanical strength.

The fifth means of the present invention realizes a catalyst unit which is easy to assemble when it is incorporated into a device, by forming a metal band on the end of the exhaust gas purifying catalyst.

Further, a sixth means of the present invention is to provide a catalyst unit, which constitutes the fifth means of the present invention, in an exhaust gas passage,
It is intended to realize a cooker in which the temperature of the catalyst rapidly rises and oil fumes and cooking odors can be effectively purified.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating the configuration of an exhaust gas purifying catalyst that is a first embodiment of the present invention.

FIG. 2 is a block diagram showing an experimental apparatus used for the exhaust gas purification experiment.

FIG. 3 is a characteristic diagram showing exhaust gas purification characteristics of the exhaust gas purification catalyst.

FIG. 4 (a) is an explanatory view showing a catalyst carrier of an exhaust gas purifying catalyst according to a second embodiment of the present invention. FIG. 4 (b) is a perspective view showing the same exhaust gas purifying catalyst.

FIG. 5 is an explanatory view explaining a state in which the exhaust gas purifying catalyst is assembled in a cooking device.

FIG. 6 is a sectional view showing the structure of a catalyst carrier of an exhaust gas purifying catalyst according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing the configuration of a catalyst unit that is a fifth embodiment of the present invention.

FIG. 8 is an explanatory view showing a configuration of a cooking device which is a sixth embodiment of the present invention.

FIG. 9 is a characteristic diagram showing the relationship between cooking time and catalyst temperature.

[Explanation of symbols]

 1 lath net 2 arc part 3 punching plate 6 exhaust gas purification catalyst 8 metal band 18 catalyst unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01J 23/89 ZAB B01D 53/36 ZABH

Claims (6)

[Claims] 1. A catalyst is supported on a catalyst carrier composed of a lath net processed into a corrugated plate shape, and the corrugated plate has a height larger than a pitch and a peak-to-peak outer diameter of the peak-to-peak shape. Exhaust gas purification catalyst with a size equal to or larger than the size of the gap. 2. An exhaust gas purifying method, wherein a lath net punched into a shape having circular arcs at four corners when processed into a corrugated plate shape is processed into a corrugated plate shape to form a catalyst carrier, and a catalyst is carried on this surface. catalyst. 3. An exhaust gas purifying catalyst comprising a catalyst carrier formed by alternately laminating corrugated plate lath nets and punching plates. 4. An exhaust gas-purifying catalyst comprising a catalyst carrier formed by laminating lath meshes with a lath mesh direction shifted by 90 °. 5. A catalyst unit formed by fitting a metal band to an end of the exhaust gas purifying catalyst according to any one of claims 1 to 4. 6. A cooker provided with the catalyst unit according to claim 5 in an exhaust gas passage.