JPH06182154A - Catalyst unit apparatus for deodorizing flue gas - Google Patents

Abstract

PURPOSE:To purify exhaust gas containing polluting components of mainly hydrocarbons while saving energy. CONSTITUTION:An air blowing fan 10 is installed in one flow route (a) of a cross flow-type heat-exchanger 9 and an oxidization catalyst 11 and an oxidization catalyst heating apparatus 12 are set in the other flow route (b) and the polluted exhaust gas is made to flow successively in the air blowing fan, the flow route (a), the oxidization catalyst heating apparatus, the oxidization catalyst, and the flow route (b), so that heat-exchange is carried out between the flowing-in gas and the flowing-out gas in the cross flow-type heat-exchanger 9 and exhaust gas purification and heat recovery are carried simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for generating exhaust gas containing odorous components mainly composed of hydrocarbons, harmful components such as oil mist and organic solvent gas, and unpleasant components, and particularly for cooking grilled meat, grilled chicken and the like. The present invention relates to a smoke removal odor catalyst unit device for purifying smoke, oil, and odor components contained in exhaust gas of equipment.

[0002]

2. Description of the Related Art Conventionally, when an oxidation catalyst was used, a temperature of about 200 ° C. to 500 ° C. was required depending on the type of the catalyst and the components to be removed. Therefore, a method such as an electric heater or a combustion burner has been used as a heating means for the catalyst or the processing gas.

In the case of a cooking apparatus as an example of the applied equipment, large oil droplets generated from the meat roasted on the roster 2 heated by the burner 1 are located at the bottom as shown in FIG. Smoke and odor fall into a water stopper 4, and the blower 5 sucks smoke and odor from the opening 3. On the way, oil drops are removed by the pre-filter 6, odor and smoke are removed by the electrostatic precipitator 7, and the air is discharged from the air outlet 8 (see Japanese Utility Model Publication No. 1-175740).

[0004]

However, with the above-mentioned structure, not only odor and smoke cannot be completely removed, but
High-voltage discharge from an electric dust collector turned the odor into an irritating odor, irritating the nose and eyes (Fukuyama et al .;
J. Odor Research and Eng. 1
989, 20 (3) 35-36).

Even when an oxidation catalyst is used, the exhaust gas whose temperature has been raised is released as it is, and much energy is wasted.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to burn off smoke and odor contained in the exhaust gas of a meat roaster, etc., by using a catalyst and saving energy.

[0007]

In order to solve the above problems, the present invention utilizes an oxidation catalyst and an orthogonal heat exchanger. The oxidation catalyst is a very effective method for converting carbon and hydrogen, which are main constituents of smoke and odor, into CO ₂ and H ₂ O for the purpose of the present invention. Since it is necessary to keep the temperature of the catalyst to a certain level in order for the ordinary oxidation catalyst to work effectively, a heat exchanger is also used as a means for obtaining the necessary energy. Also, considering the shape of the catalyst,
The heat exchanger was an orthogonal type. Further, depending on the purpose of use, a unit in which the oxidation catalyst heating device and the blower fan are arranged in front and back is preferably integrated.

Further, in order to prolong the gas passage time of the heat exchanger, the orthogonal heat exchanger is provided with one or more partition walls. Further, in order to remove the oil mist contained in the exhaust gas and prevent the deterioration of the heat exchange capacity due to dirt, a filter is provided in the front part of the orthogonal heat exchanger.

Further, it is also preferable that the orthogonal heat exchanger or the orthogonal heat exchanger and the oxidation catalyst are incorporated into a cartridge to form a heat exchange unit. Furthermore, as a material for orthogonal heat exchangers, a material consisting of ceramic short fibers and ceramic fine powder is molded into a paper mold, and a flat plate and a corrugated plate are stacked one by one, and the directionality of the corrugated plate is further improved. The configuration is changed in the orthogonal direction.

[0010]

According to the present invention, the clean exhaust gas having a high temperature discharged from the catalyst whose temperature has been raised enters the orthogonal type heat exchanger, and a separate circuit of the heat exchanger is formed in this heat exchanger. The heat is passed to the inflowing exhaust gas having a low temperature containing the passing pollutant, and the heat is discharged to the outside at a low temperature.

On the other hand, the inflowing exhaust gas, which has received energy from the heat exchanger and has been heated, is further raised in temperature by the oxidation catalyst heating device and cleaned by the catalyst, and then enters the heat exchanger again. By repeating the above cycle, the exhaust gas is continuously cleaned.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG. 1, 9 is an orthogonal heat exchanger having a structure having left and right and upper and lower flow paths in the figure. Letting the left and right flows be a and the upper and lower flows be b, the blower fan 10 faces the surface 9'where the flow of a enters.
Is installed. Further, the oxidation catalyst 11 is installed facing the surface 9 ″ into which the other flow b of the orthogonal heat exchanger 9 enters, and the oxidation catalyst heater 12 is installed below the oxidation catalyst 11.

In the above structure, the exhaust gas containing pollutant components such as odor and smoke enters by the blower fan 10 from the surface 9'of the orthogonal heat exchanger 9 into which the air flow a flows, and exits from the surface on the opposite side. Further, the exhaust gas passes through the heated heater for oxidation catalyst 12, is heated, and enters the oxidation catalyst 11.
Here, polluting components such as odors and smoke, which are composed of hydrocarbons, are oxidatively decomposed into carbon dioxide gas and water as shown in the following relational expression, and cleaned.

HmCn + (1 / 4m + n) O ₂ → 1/2
Since the exhaust gas purified by mH ₂ O + nCO ₂ is heated, it is unavoidable in terms of energy if it is discharged as it is. Therefore, the heated exhaust gas is supplied to the orthogonal heat exchanger 9 again.
The flow path is formed so as to be taken in from the lower surface 9 ′ of the above and to escape to the upper surface. The clean exhaust gas heated in the orthogonal heat exchanger 9 is heat-exchanged with the low-temperature untreated exhaust gas, and is discharged at a low temperature. On the other hand, the unprocessed exhaust gas that has undergone heat exchange in the orthogonal heat exchanger 9 is slightly heated, passes through the oxidation catalyst heating heater 12 and the oxidation catalyst 11, and then enters the orthogonal heat exchanger 9 again to form a flow path. To do. The above cycle is repeated to treat the exhaust gas.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIGS.

2 differs from the above embodiment in that the blower fan 10 is omitted from the configuration shown in FIG. In this embodiment, the exhaust gas is already pressurized even without the blower fan 10. The operation of this configuration is the same as that of the second embodiment except that the exhaust gas containing the pollutant flows into the orthogonal heat exchanger 9 due to its high pressure, and therefore the description thereof is omitted.

(Embodiment 3) FIG. 3 is different from Embodiment 1 in that the blower fan 10 and the oxidation catalyst heater 12 are omitted from the configuration shown in FIG. In this embodiment, the exhaust gas is already pressurized without the blower fan 10, and even if the oxidation catalyst heating heater 12 is not used, the exhaust gas reaches the temperature range where the oxidation reaction starts. . In such a case, the exhaust gas whose temperature has risen by causing an oxidation reaction on the oxidation catalyst 11 can raise the temperature of the exhaust gas entering the oxidation catalyst 11 by the orthogonal heat exchanger 9 to adjust the usage conditions of the catalyst. it can.

Although the heat exchanger structure has a single flow path path in the first to third embodiments, a multi-step flow path path is preferable to improve the heat exchange rate. As an example, the structure is shown in FIG. In FIG. 4, a plurality of partition walls 15 are provided so as to be in contact with the gas inflow / outflow surface 14 located next to the vertically long orthogonal heat exchanger 13, and one orthogonal heat exchanger is used to form a plurality of heat exchange units. It has a structure that plays a role. In this structure, the low temperature gas flows into the first heat exchange unit part 16 from the gas inflow / outflow face 14 in the upper right part of FIG. 4, and then flows from the opposite face to the second heat exchange unit part 17 in reverse to the third heat exchange unit part. The heat exchange unit section 18 and the fourth heat exchange unit section 19 are moved to. The gas exiting the fourth heat exchange unit portion 19 is heated by a heater or the like (not shown in the figure), flows into the lower gas inflow / outflow surface 20 of the orthogonal heat exchanger 13, and externally from the upper gas inflow / outflow surface 21. Escape to. During that time, the gas having a high temperature is sequentially transferred to the fourth to first heat exchange units, so that the temperature can be gradually lowered and finally lowered to near the temperature of the low temperature gas flowing in from the gas inflow surface 14. it can.

The catalyst unit for smoke removal odor is often an exhaust gas containing a large amount of oil mist depending on its purpose, such as for a meat roaster. In such a case, if gas is allowed to flow into the heat exchanger as it is, oil adheres to the inner wall of the heat exchanger,
The heat exchanger will be contaminated. Therefore, as shown in FIG. 5, it is very convenient to adopt a structure in which an oil filter 22 having a plurality of wire meshes is installed before the gas enters the orthogonal heat exchanger 9. Furthermore, by making the oil filter 22 removable from the main body and recleaning it, the actual service life can be greatly extended.

[0021] A drawback of using an orthogonal heat exchanger, which is one of the main components of the present invention, made by cutting ceramic short fibers into a paper shape is that the strength is weak.
For this reason, this component can be easily destroyed unless it is handled carefully. Therefore, as shown in FIG. 6, the orthogonal heat exchanger 9 is installed inside the heat exchanger frame 23 made of a metal plate to be integrated as a heat exchange unit. As a result, the orthogonal heat exchanger can be easily put in and taken out of the main body. In particular, the corner portion 24 is weak and may be easily collapsed, but this point can be improved by the heat exchanger frame 23.

In addition to the above-mentioned embodiment, the oxidation catalyst 11 as shown in FIG.
It is also possible to put them together in the heat exchanger frame 23 ′ to form one unit.

As shown in FIG. 8, the heat exchanger used in the present invention is formed by molding a material consisting of ceramic short fibers 24 and ceramic fine powder 25 into a paper shape, and stacking a flat plate 26 and a corrugated plate 27 one by one. The structure that prevents the passage of gas at the point 28 where they are in contact with each other has one layer, and the corrugated directionality is further changed to the orthogonal direction. Since this heat exchanger has a shape such as a cube or a rectangular parallelepiped, the structure is relatively simple and the size of the smoke removal odor catalyst unit device can be made compact.

According to the present invention, the heat exchange rate is about 70% in the configuration of FIG.
Was obtained. The various conditions at that time are as follows: Heat exchanger capacity 160 × 160 × 300 mm ³ Number of heat exchanger stages 2 stages Oxidation catalyst capacity 150 × 150 × 70 mm ³ Air flow rate about 1 m ³ / min Oxidation catalyst Mn-Co-Fe oxide Catalyst temperature Approx. 300 ° C Note that when normal grilled meat is cooked under the above conditions, it will be approx.
A hydrocarbon removal rate of 0% was obtained.

[0025]

The effects of the catalytic unit for smoke removal odor of the present invention are as listed below. 1. The energy used to heat the catalyst can be efficiently recovered. Exchange efficiency of about 70% when using two heat exchanger stages (the more stages, the better). 2. It is safer than other methods and does not generate an unpleasant odor. Ozone (O ₃ ) because high voltage is not used
Also, there is no generation of an unknown third compound. 3. Since the shape of the heat exchanger is cubic or rectangular parallelepiped, the structure is relatively simple and the size of the smoke removal odor catalyst unit device can be made compact. 4. The heat exchanger and the catalyst are unitized and can be easily taken in and out of the device. Therefore, it is convenient for maintenance.

[Brief description of drawings]

FIG. 1 is an operational configuration diagram of a smoke removal odor catalyst unit device according to a first embodiment of the present invention.

FIG. 2 is an operation configuration diagram of a smoke removal odor catalyst unit device according to a second embodiment of the present invention.

FIG. 3 is an operation configuration diagram of a smoke removal odor catalyst unit device according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of an orthogonal heat exchange unit provided with a partition plate.

FIG. 5 is a perspective view of an example in which a heat exchanger is put in a metal frame and made into a cartridge.

FIG. 6 shows the orthogonal heat exchanger installed inside the heat exchanger frame,
Perspective view of an example integrated as a heat exchange unit

FIG. 7 is a perspective view showing another example integrated as a heat exchange unit.

FIG. 8 is a diagram showing a configuration of a heat exchanger.

FIG. 9 is a cross-sectional view of an application example applied to a cooking device as a conventional example.

[Explanation of symbols]

 9 Orthogonal heat exchanger 10 Blower fan 11 Oxidation catalyst 12 Oxidation catalyst heating device 15 Partition wall 23 Heat exchanger frame

Claims (7)

[Claims] 1. A catalyst unit device for smoke removal odor, which integrates an orthogonal heat exchanger, an oxidation catalyst, an oxidation catalyst heating device, and a blower fan. 2. A smokeless odor catalyst unit device in which an orthogonal heat exchanger, an oxidation catalyst and an oxidation catalyst heating device are integrated. 3. A smokeless odor catalyst unit device in which an orthogonal heat exchanger and an oxidation catalyst are integrated. 4. One orthogonal heat exchanger is provided with one or more partition walls, the ventilation directions are reversed, the ventilation time is lengthened, and the heat transfer area is increased. Deodorizing odor catalyst unit device. 5. The smoke-eliminating odor catalyst unit device according to claim 1, wherein a filter is provided at the front of the orthogonal heat exchanger. 6. The smokeless odor catalyst unit device according to claim 1, wherein the heat exchanger or the heat exchanger and the catalyst are made into a cartridge to constitute a heat exchange unit. 7. A material comprising ceramic short fibers and ceramic fine powder as an orthogonal heat exchanger material is molded into a paper shape, and one flat plate and one corrugated plate are stacked to form one layer, and the corrugated plate The smokeless odor catalyst unit device according to claim 1, wherein the directionality is further changed to the orthogonal direction.