JPH10230136A - Deodorizing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability while purification capacity is raised by enlarging a contact area of a catalyst with exhaust gas by a method wherein a catalyst is borne on a fine formed by winding spirally a band metal sheet on a metal pipe, and heat insulating material is wound on that in which a heater is fitted turbularly in the metal pipe. SOLUTION: Deodorizing equipment provided in an exhaust gas route of a garbage treater exhaust exhaust gas purified with a deodorizing heater 4 contained in a pipe-shaped case 3, and a pipe-shaped metal sheet 9 on outer periphery of a fin 7, and a heat insulating material 10 outside the metal sheet 9 are provided. A contact area with the exhaust gas is increased by constituting an exhaust route of the exhaust gas sprially thus. Further, the fin 7 and a metal pipe 6 are made of a same material to make expansion and shrinkage dimensions to quick heating and quenching the same ones, and purification efficiency of the exhaust gas is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing apparatus for purifying odor components, oily fumes and the like generated during the processing of kitchen waste.

[0002]

2. Description of the Related Art Conventionally, in a garbage disposal machine, a honeycomb-shaped oxidation catalyst using a ceramic carrier is disposed in an exhaust gas path in order to purify odors and oily smoke generated from the apparatus, and the oxidation catalyst is heated from the outside. It employs a method of oxidatively decomposing odor components.

[0003]

However, the above-mentioned conventional method has a problem that 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 and a low thermal conductivity of ceramics, so that the rate of temperature rise is slow. Also, the oxidation catalyst used has a honeycomb shape, so the temperature distribution becomes uneven, the contact efficiency between the exhaust gas and the catalyst is poor, and there is a problem in the exhaust gas purification capacity. When clogging occurs, the cell loses its purifying ability at all.

[0004]

According to the present invention, the exhaust gas discharge path is formed spirally by a pipe-shaped thin metal plate and a heat insulating material, and the contact area between the catalyst and the exhaust gas is increased to improve the exhaust gas purification capacity. It is a deodorizing device that is expensive and has excellent durability.

[0005]

According to the first aspect of the present invention, the exhaust gas discharge path is spirally formed by a pipe-shaped thin metal plate and a heat insulating material to increase the contact area between the catalyst and the exhaust gas.
The fin and the metal pipe are formed of the same material, the expansion and shrinkage dimensions for rapid heating and quenching are the same, and the deodorizing apparatus has high exhaust gas purification efficiency and excellent durability and can prevent crevice corrosion.

[0006] The invention described in claim 2 is a deodorizing apparatus which uses stainless steel as a metal material and has particularly enhanced corrosion resistance.

According to the third aspect of the present invention, the metal material and the catalyst are firmly adhered to each other and the corrosion resistance is extremely high by forming an oxidation passivation film having a layer made of chromium oxide on the outermost surface. It is a deodorizing device.

According to a fourth aspect of the present invention, a metal material and a catalyst are firmly adhered to each other by a heating passivation film formed of chromium oxide on the outermost surface and having irregularities such as black plating, and the corrosion resistance is improved. Very high deodorizing equipment.

According to a fifth aspect of the present invention, there is provided a tubular heater in which only the both ends of a spirally wound fin are fixed to a metal pipe, and the fin can freely expand and contract with respect to expansion and contraction due to heat. No stress is applied to the deodorizing device, and it has excellent durability.

According to the present invention, the amount of catalyst that can be supported by the fins of the deodorizing heater formed by spirally winding while forming the radially uneven portion is large,
The deodorizing device has a high mounting strength.

[0011] According to a seventh aspect of the present invention, the fins of the deodorizing heater are formed in such a manner that either one of both ends of the heat generating portion formed by the tubular heater is left, and the remaining portion is used as an exhaust gas inlet side. The deodorizer has a uniform temperature distribution and a large exhaust gas purification capacity.

[0012]

Embodiments of the present invention will be described below. The deodorizing device of the present embodiment is provided in an exhaust gas path of a kitchen waste treatment machine. FIG. 1 is a side sectional view showing the configuration of the present embodiment. 1 is an exhaust gas intake port, 2 is an exhaust gas exhaust port, and exhaust gas is exhausted from the exhaust port 2 by a deodorizing heater 4 housed in a pipe-shaped case 3 (hereinafter simply referred to as case 3). You. A heat insulating material 5 is wound around the outer circumference of the case 3 to reduce the influence of the external temperature on the deodorizing heater 4. The deodorizing heater 4 has a configuration in which a catalyst is supported on fins 7 formed by spirally winding a strip-shaped metal thin plate around a metal pipe 6, and a tubular heater 8 is mounted inside the metal pipe 6. On the outer periphery of the fin 7, a pipe-shaped metal sheet 9 and a heat insulating material 10 using ceramic fibers or the like provided outside the metal sheet 9 are provided. A fixing cap 1 is provided at the end of the deodorizing heater 4.
1 and 12 are provided to prevent leakage of exhaust gas. The exhaust gas is forcibly exhausted by a suction fan connected to the outlet 2 not shown.

FIG. 2 is a side sectional view showing the structure of the deodorizing heater 4, and FIG. 3 is a sectional view taken along line BB of FIG. The deodorizing heater 4 has fins 7 having both ends 7a and 7b fixed to a hollow metal pipe 6. At this time, the fin 7 is
As shown in FIG. In this embodiment, the metal pipe 6 is made of 22Cr-2Mo ferritic stainless steel (NAR-FC-4 made by Sumitomo Metal),
0.4mm and 8.5mm inside diameter are used. The thin metal plate constituting the fin 7 is made of 22Cr-2Mo ferritic stainless steel (NAR-FC-4 made by Sumitomo Metal) having a thickness of 0.1 mm and a band width of 15 mm. That is, the metal pipe 6 and the fin 7 use the same metal material. The metal pipe 6 and fin 7 are made of Ni-Cr heat-resistant steel, Incoloy 800 or equivalent, Inconel 600 equivalent or SUS309.
-Austenitic heat-resistant stainless steel such as SUS310 is also suitable, but according to experiments by the inventors, the above-mentioned stainless steel shows the highest corrosion resistance. From the viewpoint of workability, it is necessary to apply a softening treatment and a corrosion-resistant oxidation passivation film to the surface of the base material from the viewpoint of workability.

Hereinafter, a method of manufacturing the deodorizing heater 4 of the present embodiment will be described. First, the fin 7 is attached to the pipe 6.
In this attachment, the winding start portion 7a is fixed to the metal pipe 6 by welding or the like, a thin metal plate having a band width of 15 mm is spirally wound around the metal pipe 6 at a pitch of 10 mm, and the winding end portion 7b is welded or the like. It is manufactured by fixing to the metal pipe 6. This pitch is determined in consideration of the amount of exhaust gas, pressure loss, and the like. The thin metal plate with the winding start portion 7a fixed thereto is applied to the metal pipe 6 at a right angle with the metal pipe 6 at the center, and spirally wound while forming the radially uneven portion 7c shown in FIG. Things. At this time, the winding start portion 7a of the thin metal plate is located at a position inside the end of the mounting position of the tubular heater 8. Thus, the winding start portion 7a is arranged on the side of the intake port 1 shown in FIG. In this case, the winding start portion 7a is not necessarily
It is not necessary to set the winding end portion 7b inside the insertion position of the tubular heater 8 and arrange the winding end portion 7b on the side of the intake port 1 without any problem. is there.

The metal pipe 6 and the fin 7 thus produced
Is subjected to heat treatment in a state in which water is removed from the surface after degreasing and washing to form an oxide passivation film having a layer made of chromium oxide on the outermost surface. In this heat treatment, nitrogen gas is 82 to 86% by volume, hydrogen gas is 2 to 4% by volume, carbon monoxide gas is 2 to 4% by volume, carbon dioxide gas is 9 to 11% by volume, and oxygen gas is 0.05 to 0.2% by volume. % In a mixed gas atmosphere containing 1000% to 1100 ° C. In this embodiment, the heat treatment is performed by a heating type atmospheric gas generator (DX gas apparatus) using city gas as an atmospheric gas raw material. By this heat treatment, an oxide passivation film having irregularities such as black plating is formed on the outermost surface, and the catalyst and the fin 7 are firmly adhered to each other. Further, this oxidation passivation film is very tough, does not corrode even by contact with exhaust gas, and enhances the corrosion resistance of the device.

The formation of the oxidation passivation film is carried out by using nitrogen gas at 40 to 50% by volume, hydrogen gas at 13 to 19% by volume, carbon monoxide gas at 13 to 19% by volume, and carbon dioxide gas at 20 to 24% by volume. It can also be formed by heat treatment in a mixed gas atmosphere containing 0.5% to 1.5% by volume of oxygen gas in a temperature range of 1050 ° C. to 1150 ° C. The heat treatment under the above conditions can be performed by an endothermic continuous heat treatment furnace (RX gas apparatus) using propane gas, carbon dioxide gas, and air as atmosphere gas raw materials.

The catalyst used is a wash coat of a mixture of γ-alumina (alumina sol) and α-alumina particles of about 20 μm in a ratio of 1 to 3: 9 to 7 as a solid content. (PT-P salt manufactured by Tanaka Kikinzoku Kogyo) is applied and dried. That is, the wash coat is applied to a thickness of about 30 μm, dried, and then dried at 500 to 600 ° C. for 15 to 30.
After calcination and baking, the amount of platinum nitrate
It is applied so as to be adjusted to a ratio of 1 g / L (liter), dried, and baked at 500 to 600 ° C. for 5 to 15 minutes. In this case, in this embodiment, an oxide film is formed on the surface of the fin 7, and this oxide film is used as a catalyst base layer.

Thus, the tubular heater 8 is inserted into the assembly of the metal pipe 6 and the fins 7 supporting the catalyst, and the heater 4 is completed. In this embodiment, the tubular heater 8 is
100V-200W, total length 235mm, heating length 150mm, pipe diameter φ8,0mm
Is used. The tubular heater 8 includes a heater pipe 8e and a terminal rod 8 provided in the heater pipe 8e.
f, a heating wire 8g connected to the terminal rod 8f, magnesia 8h which is an insulating powder filled in the heater pipe 8e,
It is formed by glass sealing materials 8a and 8b for sealing the ends, and insulators 8c and 8d provided on the outside. As the tubular heater 8, a Milacron heater, a Coltz heater, a quartz tube heater, a halogen heater, or the like can be used.

The operation of this embodiment will be described below. When a switch (not shown) is turned on and the tubular heater 8 is energized, this heat is quickly transmitted to the fins 7 and the catalyst carried on the surfaces of the fins 7 is activated. The exhaust gas flowing from the intake port 1 spirally rises by the fins 7 and is discharged from the exhaust port 2. During this time, the catalyst carried on the surfaces of the fins 7 purifies the exhaust gas, and when the exhaust gas exits the exhaust port 2, the exhaust gas becomes a clean gas.

At this time, according to this embodiment, the pipe-shaped metal sheet 8 provided on the outer periphery of the fin 7 and the metal sheet 8
And a heat insulating material 9 provided outside of the above-mentioned member forms a strong exhaust gas discharge path. For this reason, the exhaust gas rises spirally without leaking through the discharge path formed by the fins 7. Therefore, the contact area between the catalyst provided on the surface of the fin 7 and the exhaust gas becomes large, and a deodorizing device having high exhaust gas purification capability is realized. Further, since the fins 7 and the metal pipe 6 are formed of the same material, a deodorizing apparatus having particularly excellent durability can be realized. That is,
Since the fin 7 and the metal pipe 6 have the same coefficient of thermal expansion,
The degree of deformation of the fins 7 and the metal pipe 6 is the same even under severe temperature conditions of rapid heating and quenching. Therefore, both of them do not suffer from mechanical distortion, and realize a deodorizing heater excellent in durability. Further, since the fin 7 and the metal pipe 6 are made of the same material, there is no occurrence of a local battery due to the use of a dissimilar metal and no occurrence of crevice corrosion.

In the deodorizing heater 8, since only the both ends 7a and 7b of the spirally wound fin 7 are fixed to the metal pipe 6, the central portion is free, and the heater 8 is free from expansion and contraction due to heat. The fins 7 can freely expand and contract, do not apply stress to the tubular heater 8, and can realize a deodorizing apparatus having excellent durability.

Further, the fin 7 fixes the winding start portion 7a to the metal pipe 6 by welding or the like.
Is formed by spirally winding while forming a radially uneven portion 7c with the metal pipe 6 at right angles to the metal pipe 6. Therefore, the amount of catalyst that can be supported is large,
Further, the present invention realizes a deodorizing device having a high attachment strength of the fins 7 to the metal pipe 6. Further, when the exhaust gas comes into contact with the uneven portion 7c, the flow of the exhaust gas becomes turbulent, and the contact efficiency with the catalyst is further enhanced.

The fins 7 are formed so as to leave one of both ends of the heat generating portion formed by the tubular heater 8, and the remaining portion is used as an intake port side. For this reason, the normal-temperature exhaust gas flowing from the intake port 1 is smoothly heated by the tubular heater 8, and the temperature difference from the exhaust gas flowing through the exhaust port 2 is reduced. Therefore, it is possible to realize a deodorizing device having a high exhaust gas processing speed and a high exhaust gas purifying ability. Further, since the fins 7 are arranged in the high-temperature portion, the action of the catalyst is active and a highly efficient deodorizing device is realized.

Further, since the fins 7 and the metal pipe 6 are made of stainless steel, it is possible to provide a deodorizing device having high corrosion resistance.

Since a passive oxide film made of chromium oxide is provided on the surfaces of the fins 7 and the metal pipe 6,
The catalyst and the metal pipe 6 can be firmly adhered to each other, and a deodorizing device having extremely high corrosion resistance against exhaust gas can be provided.

(Experimental Example) Hereinafter, experimental results confirming the effect of the deodorizing apparatus of this embodiment will be reported.

Table 1 compares the thermal conductivity and the heat capacity of the embodiment and the conventional structure.
Table 2 shows a comparison between the corrosion resistance of this embodiment and that of the conventional structure.

[0028]

[Table 1]

[0029]

[Table 2]

As can be seen from Tables 1 and 2, the structure of this embodiment has a very high heat conductivity and a small heat capacity, so that the rate of temperature rise is very high. Also, it has excellent corrosion resistance. In particular, regarding the corrosion resistance, 22Cr-2
The heat-treated Mo has very good corrosion resistance.

Further, methyl sulfide gas is generated using a kitchen waste disposal apparatus, and the residual rate is measured using the apparatus of the present embodiment and a conventional apparatus. In this experiment, the tubular heater 8 was used.
A sheathed heater having a capacity of 100V-200W is used.
The fin 7 has an apparent volume of 100 cc, and the amount of the catalyst supported on the fin 7 is 1 g / L as platinum.
The exhaust gas used in the experiment had a methyl sulfide concentration of 0.01%, and the flow rate was set to 8 L / min.
Thus, the residual ratio of methyl sulfide when the surface temperature of the tubular heater 8 is variously changed is determined.

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

[0033]

According to the first aspect of the present invention, there is provided a deodorizing heater in which a catalyst is carried on fins formed by spirally winding a band-shaped thin metal plate on a metal pipe, and a tubular heater is mounted in the metal pipe. A pipe-shaped metal sheet closely attached to the outside of the fins, a heat insulating material provided outside the metal sheet, a deodorizing heater, a pipe-shaped case accommodating the pipe-shaped metal sheet and the heat insulating material. By forming the fins and the metal pipe with the same metal material, a contact area between the catalyst and the exhaust gas can be increased, the exhaust gas purifying ability is high, and the durability is excellent, and a deodorizing apparatus capable of preventing crevice corrosion can be provided. It can be realized.

The invention described in claim 2 realizes a deodorizing apparatus having a particularly high corrosion resistance by using stainless steel as a metal material.

According to a third aspect of the present invention, the metal material is 82-86% by volume of nitrogen gas and 2-4% by volume of hydrogen gas in a state where the surface is degreased and cleaned, and the surface is dehydrated.
In a mixed gas atmosphere containing 2% to 4% by volume of carbon monoxide gas, 9% to 11% by volume of carbon dioxide gas, and 0.05% to 0.2% by volume of oxygen gas, in a temperature range of 1000 ° C. to 1100 ° C. By heat treatment, an oxidation passivation film made of chromium oxide is formed on the outermost surface, and a metal material and a catalyst can be firmly adhered to each other, achieving a highly durable deodorizing device with extremely high corrosion resistance. Is what you do.

According to a fourth aspect of the present invention, in the metal material, after the surface is degreased and cleaned, moisture is removed from the surface, and nitrogen gas is added in an amount of 40 to 50% by volume and hydrogen gas in an amount of 13 to 50%.
19% by volume, 13 to 19% by volume of carbon monoxide gas, 20 to 24% by volume of carbon dioxide gas, and 0.5 to 1.5% by volume of oxygen gas.
1050 ° C in a mixed gas atmosphere containing 5% by volume
By performing heat treatment in the temperature range of ~ 1150 ° C, the oxidation passivation film made of chromium oxide is formed on the outermost surface, so that the metal material and the catalyst can be firmly adhered to each other and have excellent durability. A very high deodorizing device is realized.

According to a fifth aspect of the present invention, the deodorizing heater is formed by fixing only both ends of a spirally wound fin to a metal pipe, so that the fin is prevented from expanding and contracting due to heat. An object of the present invention is to realize a deodorizing apparatus which can freely expand and contract, does not apply stress to a tubular heater, and has excellent durability.

According to a sixth aspect of the present invention, the fins of the deodorizing heater are formed by spirally winding a thin metal plate around a metal pipe at a right angle to the metal pipe to form a radially uneven portion. With such a configuration, it is possible to realize a deodorizing device having a large amount of catalyst that can be supported and having high mounting strength.

According to a seventh aspect of the present invention, the fins of the deodorizing heater are formed so as to leave one of both ends of the heat generating portion formed by the tubular heater, and the remaining portion is used as an exhaust gas inlet side. The present invention realizes a deodorizing device having a uniform temperature distribution and a large exhaust gas purifying ability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a deodorizing apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the configuration of the deodorizing heater.

FIG. 3 is a front sectional view of the deodorizing heater illustrating the shape of the fin.

[Explanation of symbols]

 Reference Signs List 3 pipe-shaped case 4 deodorizing heater 6 metal pipe 7 fin 8 tubular heater 9 pipe-shaped thin metal plate 10 heat insulating material

Claims (7)

[Claims] 1. A catalyst is carried on a fin formed by spirally winding a strip-shaped metal thin plate around a metal pipe, and a deodorizing heater having a tubular heater mounted in the metal pipe is brought into close contact with the outside of the fin. A pipe-shaped metal sheet, a heat insulating material provided outside the metal sheet, a deodorizing heater, a pipe-shaped case accommodating the pipe-shaped metal sheet and the heat insulating material, wherein the fin and the metal pipe are the same. Deodorizing device made of metal material. 2. The deodorizing apparatus according to claim 1, wherein stainless steel is used as the metal material. 3. After the surface of the metal material is degreased and cleaned,
With water removed from the surface, nitrogen gas
% By volume, 2 to 4% by volume of hydrogen gas, and 2% of carbon monoxide gas.
In a mixed gas atmosphere containing ４4% by volume, 9-11% by volume of carbon dioxide gas, and 0.05-0.2% by volume of oxygen gas, heat treatment is performed at a temperature range of 1000 ° C. to 1100 ° C., so that the outermost surface is formed. 3. The deodorizing device according to claim 1, wherein an oxidation passivation film made of chromium oxide is formed. 4. After the surface of the metal material is degreased and cleaned,
While removing moisture from the surface, nitrogen gas is added for 40 to 50
Mixed gas containing 13 to 19% by volume of hydrogen gas, 13 to 19% by volume of carbon monoxide gas, 20 to 24% by volume of carbon dioxide gas, and 0.5 to 1.5% by volume of oxygen gas The deodorizing apparatus according to claim 1 or 2, wherein an oxidized passivation film made of chromium oxide is formed on the outermost surface by performing a heat treatment in a temperature range of 1050 ° C to 1150 ° C in an atmosphere. 5. The deodorizing device according to claim 1, wherein the deodorizing heater is formed by fixing only both ends of a spirally wound fin to a metal pipe. 6. The fin of the heater according to claim 1, wherein the fin of the heater is formed by spirally winding a thin metal plate on the metal pipe at right angles to the metal pipe to form a radially uneven portion. A deodorizing device according to any one of the preceding claims. 7. The fin of the deodorizing heater is formed by leaving one of both ends of the heat generating portion formed by the tubular heater, and the remaining portion is used as an exhaust gas inlet side. The deodorizing device described in the item.