JPH08155266A - Deodorizing heater and deodorizing apparatus - Google Patents

Abstract

PURPOSE: To provide a deodorizing heater increased in temp. rising speed, uniform in temp. distribution and enhanced in the purifying capacity of exhaust gas. CONSTITUTION: A fin 2 formed by spirally winding a strip like thin metal plate is provided to a tubular heater and a catalyst is supported on the surface of the fin 2 to constitute a deodorizing heater large in the contact area of exhaust gas with the catalyst, increased in the transmitting speed of heat to the catalyst and excellent in thermal shock.mechanical strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing heater for purifying odorous components, oily smoke, etc. generated from cooking equipment, garbage disposal, etc., and its application device.

[0002]

2. Description of the Related Art Conventionally, a honeycomb-shaped oxidation catalyst using a ceramic carrier is arranged in an exhaust gas passage in order to purify odors and oil fumes generated from cooking equipment, garbage disposal equipment, etc.
This oxidation catalyst is externally heated to oxidize and decompose odorous components.

[0003]

However, in the above-mentioned conventional method, the temperature rise of the oxidation catalyst is slow and it takes a long time to reach the decomposition temperature. That is, a honeycomb-shaped oxidation catalyst using a ceramic carrier has a large heat capacity,
This is due to the low thermal conductivity of ceramics. Further, since the shape is honeycomb, the temperature distribution becomes non-uniform, the contact efficiency between the exhaust gas and the catalyst is poor, and there is a problem in the exhaust gas purification ability.

SUMMARY OF THE INVENTION The present invention is intended to solve the problems of the above-mentioned conventional methods. It is to provide a deodorizing heater having a rapid temperature rise, a uniform temperature distribution, and a large exhaust gas purification capability. It has one purpose. Moreover, it is the 2nd-6th objective to provide the 2nd-6th means for achieving the said 1st objective. A seventh object is to provide a deodorizing device equipped with the deodorizing heater.

[0005]

A first means of the present invention for achieving the first object is to use a fin formed by spirally winding a strip-shaped thin metal plate around a tubular heater as a catalyst carrier,
The deodorizing heater has a catalyst supported on the surface of the catalyst carrier.

A second means of the present invention for achieving the second object is, in particular, a deodorizing heater in which only both ends of a spirally wound fin are fixed to a tubular heater.

The third means of the present invention for attaining the third object is, in particular, that the fins are formed by applying a thin metal plate at a right angle to the tubular heater centering on the tubular heater to form radial irregularities. The deodorizing heater is spirally wound.

A fourth means of the present invention for attaining the fourth object is, in particular, that the fin is a deodorizing heater arranged at a position where either one of both ends of the heat generating portion constituted by the tubular heater is left. It is a thing.

A fifth means for achieving the fifth object is to use a deodorizing heater in which the outer diameter of the fin is within 8 times the outer diameter of the tubular heater.

The sixth means of the present invention for achieving the sixth object is, in particular, that the tubular heater is a sheathed heater, and the fins are a deodorizing heater made of the same material as the sheathed heater.

Further, a seventh means for achieving the seventh object is to install the deodorizing heater which constitutes the fourth means of the present invention in a pipe-shaped case, and exhaust the exhaust gas on the side where the heat generating portion remains. This is a deodorizing device used as an inflow port.

[0012]

According to the first means of the present invention, the use of spiral fins increases the contact area with the exhaust gas and makes the flow of the exhaust gas turbulent so that the catalyst supported on the fin surface is It functions as a deodorizing heater, in which heat is transferred rapidly, the temperature rises quickly, and exhaust gas purification capacity is great. Further, the catalyst carrier is composed of metal fins, which is resistant to thermal shock and has excellent mechanical strength.

According to the second means of the present invention, since only the both ends of the spirally wound fin are fixed to the tubular heater and the central part is free, the fin can freely expand and contract due to expansion and contraction due to heat. The tubular heater is stress-free. That is, it functions as a deodorizing heater having excellent durability.

According to the third means of the present invention, by forming a radial uneven portion, a fin formed by spirally winding a wide metal thin plate can be formed, and a large amount of catalyst can be supported. The mounting strength of the tubular heater is high,
Further, when the exhaust gas comes into contact with the uneven portion, it flows as a turbulent flow, so that it acts as a deodorizing heater having high contact efficiency with the catalyst.

In a fourth aspect of the present invention, a fin is provided at a position where one end of a heat generating portion constituted by a tubular heater is left, and the left side is used as an exhaust gas inlet, whereby an exhaust gas inlet is provided. And the temperature difference between the outlet and
This serves as a deodorizing heater having a uniform temperature distribution and a large exhaust gas purification capability.

The fifth means of the present invention functions as a deodorizing heater in which the fin outer diameter is within 8 times the outer diameter of the tubular heater, the fin processing is easy, the temperature distribution is good, and the catalyst utilization efficiency is high. It is a thing.

In the sixth means of the present invention, the fin and the sheathed heater constituting the tubular heater are made of the same material, the thermal expansion is the same, the expansion and contraction due to the rapid heating and the quenching are the same, and a mechanical strain may be applied. There is no such thing. In other words, it functions as a deodorizing heater having excellent durability and capable of preventing crevice corrosion due to local batteries occurring between different metals.

The seventh means of the present invention is to provide a deodorizing heater so that the side where the heat generating portion remains in the exhaust gas discharge path is used as the exhaust gas inlet, and the exhaust gas spirals along the fins. It flows as if going up the stairs, the contact area between the catalyst and the exhaust gas is large, the temperature difference between the inlet side and the outlet side of the exhaust gas is small, and the deodorizing device has a high exhaust gas purifying ability.

[0019]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
It will be described based on. Reference numeral 1 is a tubular heater for supplying heat, and a sheathed heater is used in this embodiment. The tubular heater 1 composed of a sheathed heater includes a pipe 3, a heating wire 5 connected to a terminal rod 4 inside the pipe 3, and a pipe 3.
It is formed of magnesia 11 which is an insulating powder filled inside, and the end portion 6 is sealed by a glass sealing.
Furthermore, the outside of the end 6 is protected by an insulator 7. As the tubular heater 1, a miraculon heater, a Colts heater, a quartz tube heater, a halogen heater or the like can be used.

On the surface of the tubular heater 1, there are provided fins 2 in which a strip-shaped thin metal plate is spirally wound. Fe-Cr-Al is a thin metal plate with a thickness of 10 μm to 300 μm and a strip width of 7 mm.
A heat-resistant steel (SUH21 equivalent product) of BA annealed is used. The fins 2 serve as a catalyst carrier having an oxide film formed thereon, and the catalyst carrier is carried on the surface of the catalyst carrier. As a material for the thin metal plate, considering the catalyst support, Ni-Cr heat resistant steel, Incoloy 800 equivalent, Inconel 600 equivalent, SUS309, SUS3
Austenitic heat resistant stainless steels such as 10 are also suitable. From the viewpoint of workability, it is necessary for any of the materials to be softened by a method such as BA annealing.

Next, a method for manufacturing the deodorizing heater of this embodiment will be described. First, specifications such as dimensions and capacity of the sheathed heater used as the tubular heater 1 are determined. In this embodiment, the sheathed heater is 100V-400W, total length 500mm, heat generation length 400mm,
The pipe diameter is φ6.6mm. The dimensions are those in the unannealed state. Next, a process for attaching the fin 2 to the sheathed heater is performed. Fin 2
Is manufactured by spirally winding the sheathed heater at a pitch of 5 mm. In this state, 1000 ~
30 in an atmosphere furnace (green gas atmosphere) set at 1100 ° C
Leave for about 60 minutes to form an oxide film on the surface of the fin 2. When the formation of the oxide film is completed, it is naturally cooled to use the oxide film as a catalyst carrier. After that, the end portion 6 of the sheathed heater constituting the tubular heater 1 is sealed by a glass sealing, and the insulator 7 is attached to complete the tubular heater 1.

Next, a catalyst is supported according to the application. That is, when purifying the air that has heated the room using an electric air blower or the like, γ-alumina (alumina sol) and α-alumina particles having a particle size of about 20 μm were mixed at a ratio of 1 to 3: 9 to 7 as solid content. It is used as a wash coat. This wash coat is applied to the catalyst carrier so as to have a film thickness of about 30 μm, dried and then 500 to 600 ° C.
It is baked for 15 to 30 minutes. Furthermore, organoplatinic acid is applied to the catalyst carrier after washcoat baking, adjusted so that the amount of platinum carried becomes 1 g / l, dried, and then baked at 500 to 600 ° C. for 15 to 30 minutes.

The deodorizing heater manufactured as described above is
When three (1200 W equivalent) electric warm air blowers were installed and the heater temperature was controlled to be 350 ° C. or higher, the smell of cigarettes filling the room almost disappeared after 1 hour.

Next, the loading of the catalyst for the purpose of purifying indoor air by suppressing the release of heat as much as possible in an air conditioner or an air purifier will be described. In this case, a catalyst for adsorption / regeneration, that is, a catalyst in which an adsorbent (such as zeolite) and platinum are mixed is applied to a catalyst carrier and baked. A deodorizing heater created by such a method is attached to an air conditioner or an air cleaner, and normally only the odorous components are adsorbed, and the heater is energized at regular intervals to oxidize and decompose the odorous components. It can be an air conditioner or an air cleaner that can continue deodorizing.

In this embodiment, the surface of the fin 2 is oxidized to form an oxide film, and the oxide film is used as a catalyst carrier. However, it is not necessary to form the oxide film. However, the catalyst may be directly supported on the surface of the fin 2 as long as the supported catalyst does not peel off.

As described above, in the present embodiment, by using the spiral fin 2, the contact area with the exhaust gas is increased and the flow of the exhaust gas becomes a turbulent flow, so that the fin 2 is supported on the surface of the fin 2. The heat is rapidly transferred to the catalyst, the temperature rises quickly, and the deodorizing heater has a large exhaust gas purification capability. Further, the catalyst carrier is composed of metal fins, and is resistant to thermal shock and has excellent mechanical strength.

(Embodiment 2) The construction of this embodiment is the same as that of the above-mentioned embodiment shown in FIG. In this embodiment, only both ends of the fin 2 are fixed to the tubular heater 1. That is, in the case of a heater using a ceramic tube such as a Miracron tube, both ends of the fin 2 are fixed to a fixing fitting (not shown), and the fixing fitting is fixed to the ceramic tube. In the case of the sheath heater, both ends 9 of the fin 2 are directly fixed to the pipe 3 by a method such as welding. The loading of the catalyst is the same as in Example 1.

The operation of this embodiment will be described below. Since the tubular heater 1 generates heat when in use, and the tubular heater 1 is not energized when not in use, the surface temperature of the pipe 3 has a temperature difference of 1000 deg or more between when in use and when not in use. Therefore, expansion and contraction occur in the pipe 3, and there is a large difference in expansion coefficient from the fin 2. In this embodiment, since both ends of the fin 2 are fixed to the pipe 3, the fin 2 freely expands and contracts with respect to the pipe 3 when the dimensions of the pipe 3 and the fin 2 change. is there.

That is, according to this embodiment, since only the both ends of the fin 2 are fixed to the pipe 3, no stress is applied to the tubular heater 1. Therefore, the life of the tubular heater 1 is not impaired, and the catalyst carried on the surfaces of the fins 2 is not peeled off.

(Embodiment 3) Next, a third embodiment of the present invention will be described. This embodiment relates to a method of attaching the fin 2. As described in the first embodiment, the fin 2 is formed by spirally winding a strip-shaped metal thin plate at a pitch of 5 mm, and the metal thin plate has a plate thickness of
A BA annealed product of Fe-Cr-Al heat resistant steel (SUH21 equivalent product) having a band width of 7 mm and a thickness of 10 μm to 300 μm is used. In order to realize the structure in which this thin metal plate is spirally wound, the method shown in FIG. 2 is used in this embodiment. That is, centering around the tubular heater 1, the tubular heater 1
A thin metal plate that constitutes the fin 2 is applied at a right angle to the radial concave and convex portions 10. That is, the winding start portion of the thin metal plate is fixed to the tubular heater 1 by welding, and each time one uneven portion 10 is formed, the thin metal plate is deformed by a predetermined angle to form a predetermined number of uneven portions 10. Sometimes a thin metal plate for one pitch is used as the tubular heater 1
It has been wrapped around the. Similarly, by forming the uneven portion 10 in the same manner, the thin metal plate is spirally wound a required number of times, and the winding end portion is fixed to the tubular heater 1 by welding again.

As described above, according to the present embodiment, the fins 2 formed by spirally winding a wide metal thin plate can be formed by forming the radial uneven portions 10, and a large amount of catalyst can be carried. Further, the fin 2 has a high attachment strength with respect to the tubular heater 1, and when the exhaust gas comes into contact with the uneven portion 10, it flows as a turbulent flow, so that a deodorizing heater having a high contact efficiency with the catalyst is realized.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described. As shown in FIG. 3, in this embodiment, the fin 2 having the length A is provided at a position where either one of both ends of the heat generating portion Lu formed by the tubular heater 1 is left. A catalyst is supported on the surface of the fins 2 as in the above-mentioned embodiments. The length of (Lu-A) is set according to the amount of exhaust gas to be treated.

With the above structure, the temperature difference between the inflow port 2a and the exhaust port 2b in the exhaust gas fin 2 can be reduced. That is, the temperature distribution of the tubular heater 1 is usually highest in the center part and lowers toward both ends. Further, the temperature at which the catalyst supported on the surface of the fin 2 can sufficiently act as a catalyst is preferably high. Therefore, since the temperature of the exhaust gas inlet is usually low, when the exhaust gas is swirled along the spiral fin 2, the temperature of the inlet fin is further reduced. . In order to prevent this temperature decrease, it is necessary to raise the temperature of the exhaust gas in advance.

In this respect, with the configuration of this embodiment, the fin 2
The position of is biased to the center, that is, to the high temperature side of the tubular heater 1, and the temperature of the inlet 2a is higher than in the conventional case. Therefore, it is not necessary to raise the temperature of the exhaust gas in advance, and the catalyst provided on the surface of the fin 2 sufficiently acts as a catalyst.

As described above, according to this embodiment, the fin 2 is provided at a position where one end of the heat generating portion of the tubular heater 1 is left, and the left side is used as the exhaust gas inlet 2a. The temperature difference between the exhaust gas inflow port 2a and the exhaust gas outflow port 2b can be reduced, and the temperature distribution becomes uniform, thus acting as a deodorizing heater having a large exhaust gas purification capability.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described. In the present embodiment, the outer diameter of the fin 2 is set within 8 times the outer diameter of the tubular heater 1.

That is, the fin 2 was tested by the inventors.
When the outer diameter of the fin exceeds 8 times the outer diameter of the tubular heater 1, it becomes extremely difficult to process the fins 2 and the temperature distribution is deteriorated, the utilization efficiency of the catalyst is lowered, and the exhaust gas purifying ability is lowered. It became clear.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described. In this embodiment, the tubular heater 1 is a sheathed heater, and the material of the fins 2 is the same as the pipe material of the sheathed heater.

With the above-mentioned structure, the deodorizing heater of this embodiment has excellent durability.
That is, since the fins 2 and the heater 1 have the same coefficient of thermal expansion, the expansion and contraction of the fins 2 and the heater 1 in synchronization with rapid heating and quenching are synchronized. Therefore, neither of them is subject to mechanical strain, and the fin is less deformed to realize a deodorizing heater having excellent durability. Further, since the fin 2 and the heater 1 are made of the same material and different kinds of metals are not used, crevice corrosion caused by a local battery between different kinds of metals does not occur.

(Embodiment 7) Next, a deodorizing apparatus according to a seventh embodiment of the present invention will be described with reference to FIG. This example shows a deodorizing device for a garbage processing machine. The deodorizing heater 20 described in the fourth embodiment is mounted in the pipe-shaped case 12. A seal material 13 made of a ceramic fiber is provided between the outer side of the fin 2 of the deodorizing heater 20 and the inner side of the pipe-shaped case 12. Further, a heater fixing cap 14 and a heater fixing cap 15 are incorporated at the end of the deodorizing heater 20 to seal the exhaust gas so that exhaust gas does not leak. Reference numeral 16 is an exhaust gas inlet, and 17 is an exhaust gas outlet. The inlet 16 is the inlet side 2a described in the fourth embodiment, and the outlet 17
The discharge port side 2b is arranged at. A heat insulating material 18 is wound around the pipe-shaped case 12 to insulate it. The exhaust gas is forcibly discharged by a suction fan connected to an exhaust port 17 (not shown).

The operation of this embodiment will be described below. The exhaust gas that has flowed in through the suction port 16 has a spiral fin 2.
Thus, it is spirally raised and discharged from the discharge port 17. During this period, the catalyst carried on the surface of the fin 2 purifies the exhaust gas, and when it comes out from the exhaust port 17, it becomes a clean gas. Further, as described in the fourth embodiment, since the fins 2 are arranged on the high temperature side of the tubular heater 1, the action of the catalyst is active and a highly efficient deodorizing device is realized.

The experimental results of measuring the residual ratio of methyl sulfide using this deodorizing device will be reported below. The deodorizing heater used in the experiment was a tubular heater 1 with a capacity of 10
A 0V-200W sheathed heater is used. The fin 2 has an apparent volume of 100 CC, and the amount of catalyst supported on the fin 2 is 1 g / l of platinum. The exhaust gas used in the experiment had a methyl sulfide concentration of 0.01% and the flow rate was
It is set to 8l / min. Thus, the residual ratio of methyl sulfide when the surface temperature of the tubular heater 1 was variously changed was obtained.

As a result of the experiment, the residual rate of methyl sulfide was 0 at 350 ° C. As a comparative example, a ceramic honeycomb catalyst was measured under the same conditions. As a result, at 600 ° C., the residual ratio of methyl sulfide was 2.1%.

As described above, in the deodorizing device of this embodiment, the deodorizing heater 20 is provided in the exhaust gas discharge path so that the inlet side 2a is used as the exhaust gas inlet. Flow as if going up a spiral staircase, the contact area between the catalyst and exhaust gas is large, and the temperature difference between the exhaust gas inlet side and outlet side is small, acting as a deodorizing device with high exhaust gas purification capacity. Is.

[0045]

According to the first means of the present invention, a fin formed by spirally winding a strip-shaped thin metal plate around a tubular heater is used as a catalyst carrier, and the catalyst is supported on the surface of the catalyst carrier. It is intended to realize a deodorizing heater that rises quickly, has a uniform temperature distribution, and has a large exhaust gas purification capability.

According to the second means of the present invention, particularly, both ends of the spirally wound fin are fixed to the tubular heater, and the fin can freely expand and contract due to expansion and contraction due to heat, and durability is improved. It realizes an excellent deodorizing heater.

The third means of the present invention, in particular, the fin is
A thin metal plate is applied to the tubular heater at right angles to the tubular heater to form a radial unevenness, and the spirally wound configuration allows a large amount of catalyst to be supported and the mounting strength of the fins on the tubular heater. In addition, the deodorization heater has a high exhaust gas flow rate, and the exhaust gas flow becomes a turbulent flow and has a high contact efficiency with the catalyst.

Further, in the fourth means of the present invention, in particular, the fin is arranged at a position where either one of both ends of the heat generating portion formed by the tubular heater is left, and the left side is used as an exhaust gas inlet. By using the deodorizing heater, the temperature difference between the inlet and the outlet of the exhaust gas can be reduced, and the temperature distribution becomes uniform, thereby realizing a deodorizing heater having a large exhaust gas purification capability.

The fifth means of the present invention is such that the fins have an outer diameter within 8 times the outer diameter of the tubular heater, and the fin processing is easy, the temperature distribution is good, and the catalyst is used efficiently. It realizes a heater.

A sixth means of the present invention is such that the tubular heater is a sheathed heater and the fins are made of the same material as the sheathed heater, the thermal expansion is the same, the expansion and contraction for the rapid heating and the quenching are the same, and the mechanical It is not subject to distortion. In other words, the present invention realizes a deodorizing heater having excellent durability and capable of preventing crevice corrosion caused by a local battery between different metals.

A seventh means of the present invention is to install a deodorizing heater constituting the fourth means of the present invention in a pipe-shaped case,
The structure where the remaining side of the heat generation part is used as the exhaust gas inlet, the contact area between the catalyst and the exhaust gas is large, and the temperature difference between the exhaust gas inlet side and the outlet side is small, and the deodorization with high exhaust gas purification capacity is achieved. It realizes the device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a deodorizing heater that is a first embodiment and a second embodiment of the present invention.

FIG. 2 is a sectional view taken along the line BB ′ of FIG. 1 showing the shape of the fin of the third embodiment.

FIG. 3 is a sectional view showing mounting positions of fins of the deodorizing heater according to the fourth embodiment.

FIG. 4 is a sectional view showing a deodorizing device of the seventh embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tubular heater 2 Fin 2a Inlet 2b Outlet 3 Pipe 10 Concavo-convex portion 12 Pipe-shaped case 20 Deodorizing heater

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneo Shibata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Koichi Nakano, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A deodorizing heater in which a fin formed by spirally winding a strip-shaped thin metal plate around a tubular heater is used as a catalyst carrier, and a catalyst is carried on the surface of the catalyst carrier. 2. The deodorizing heater according to claim 1, wherein both ends of the spirally wound fin are fixed to the tubular heater. 3. The deodorizing heater according to claim 1, wherein the fin is spirally wound while a thin metal plate is applied to the tubular heater at a right angle with respect to the tubular heater to form a radial uneven portion. 4. The fin is arranged at a position where either one of both ends of a heat generating portion formed by the tubular heater is left.
The deodorizing heater described. 5. The deodorizing heater according to claim 1, wherein the outer diameter of the fin is within 8 times the outer diameter of the tubular heater. 6. The deodorizing heater according to claim 1, wherein the tubular heater is a sheathed heater, and the fins are made of the same material as that of the sheathed heater. 7. A deodorizing device in which the deodorizing heater according to claim 4 is mounted on a pipe-shaped case, and the side on which the heat generating portion remains is used as an exhaust gas inflow port.