JPH0452496A - Deodorizing device - Google Patents

Abstract

PURPOSE:To prevent an odorant component in exhaust gas from being refluxed into a room by employing a honeycomb structure rotatable rotor as a heat exchanger unit, providing an ozone decomposing/deodorizing catalyst on the rotatable rotor, and successively moving an exhaust zone, an ozone deodorizing zone, and a suction zone, and further introducing ozone into the ozone deodorizing zone. CONSTITUTION:A rotatable rotor 1 where an exhaust zone 4, an ozone processing zone 5, and a suction zone 6 are moved successively includes an ozone decomposing catalyst. From an ozone addition line 7 ozone containing air is introduced from an ozone producer (not shown). After exhaust gas is introduced into other exhaust zone 4 and an odorant component is adsorbed by the exhaust zone 4, oxidation decomposition is performed by the ozone from the ozone addition line 7 in the ozone processing zone 5, and thermal energy in the exhaust gas is transmitted to the rotatable rotor 1. Thereafter, suction gas is introduced into the suction zone 6, and ventilation is completed and thermal energy of the rotatable rotor 1 is brought into the room.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a total heat exchanger that is an improved total heat exchanger for air conditioning, which is widely used to reduce heating and cooling costs for buildings and other structures. This relates to mold deodorizing equipment.

[Prior Art] In recent years, from the perspective of reducing heating and cooling costs for buildings and other structures, total heat exchangers for air conditioning that can simultaneously recover latent heat as well as sensible heat during ventilation have become widespread. Conventional total heat exchangers use a rotating rotor with a honeycomb structure as a heat exchange unit, and the material for the heat exchange unit is asbestos paper, ceramic paper, or an adsorbent sheet impregnated with a moisture-absorbing substance such as lithium chloride or silica gel. It is common to use

[The invention attempts to solve i! However, in conventional total heat exchangers, when adsorbing moisture in exhaust gas, some of the odor components are also adsorbed to the heat exchange unit along with the moisture, and the odor components are desorbed by fresh air during intake. There was a drawback that the water refluxed into the room. For this reason, when conventional total heat exchangers are used in places with strong odors such as hospitals and animal laboratories, it is necessary to take in large amounts of fresh air, so total heat exchangers are designed to save energy. This results in offsetting the original function.

The present invention was made under these circumstances, and
Its purpose is not only to function as a total heat exchanger, but also to effectively remove odor components from exhaust gas and prevent them from flowing back into the room. It is an object of the present invention to provide a total heat exchanger type deodorizing device that can be used in a reduced amount of time. Another object of the present invention is to provide a deodorizing device that can be used exclusively for deodorizing.

[Means for Solving the Problems] The present invention, which has solved the above problems, uses a rotating rotor with a honeycomb structure as a heat exchange unit, and the rotating rotor is equipped with an ozone decomposition and deodorizing catalyst. The rotating rotor is configured to sequentially move through an exhaust zone, an ozone deodorization treatment zone, and an intake zone in the circumferential direction, and has a total heat exchange function in that it is configured to introduce ozone into the ozone deodorization treatment zone. It is equipped with a deodorizing device. Further, in the present invention, a rotating rotor having a honeycomb structure is equipped with an ozone decomposition deodorizing catalyst, and the rotating rotor is configured to sequentially move through an exhaust zone and an ozone deodorizing treatment zone in the circumferential direction, and the ozone deodorizing treatment zone is provided with an ozone deodorizing catalyst. This deodorizing device also has a point in that it is configured at the root where it is introduced.

[Effect] The present inventors investigated the odor return phenomenon in an air conditioning facility of an animal laboratory using a total heat exchanger equipped with a silica gel-coated aluminum honeycomb. In addition, the humidity of the exhaust air at this time is 6
5%, the temperature is 21℃, and the ammonia concentration in the exhaust gas is 2.
．． It was 0 ppm.

As a result, the exhaust gas after passing through the total heat exchanger has 0.5p
pm of ammonia is included, and 1.5 ppm of ammonia is adsorbed by the heat exchange unit of the total heat exchanger, and the entire amount of this ammonia accompanies the intake gas (fresh air) during intake and enters the room. I found out that I'm going back to. In this investigation, the exhaust gas contained not only ammonia but also animal-specific odors that could not be identified through analysis, but these were also returned to the room along with the adsorbed gas.

By the way, as a method for treating odor components, there is an ozone oxidation method that utilizes the strong oxidizing effect of ozone, and an ozone oxidation method that uses a catalyst (this is called an ozonolysis deodorization catalyst). ing. The ozone oxidation method using a catalyst introduces ozone into a gas containing odor components.
It decomposes odor components in the presence of a catalyst. Compared to the conventional ozone oxidation method, this method not only allows odor components to react quickly with ozone without a large reaction space, dramatically improving deodorizing efficiency, but also completely decomposes ozone and removes unreacted ozone. There is no need to worry about it being released into the atmosphere.

Based on the idea of applying an ozone oxidation method using a catalyst, the present inventors have conducted repeated studies from the viewpoint of eliminating the drawbacks of conventional total heat exchangers as described above. As a result, an ozone decomposition and deodorization catalyst with a honeycomb structure is used in the rotating rotor, ozone is contained in the exhaust gas (gas to be treated), and the gas is introduced into the catalyst to remove odor components adsorbed on the catalyst. The present invention was completed based on the discovery that oxidative decomposition can reduce as much as possible the amount of odor components flowing back into the room, and greatly reduce the amount of fresh air taken in.

Considering the deodorizing ability, surplus ozone decomposition ability, adsorption ability, etc., the ozone decomposition and deodorization catalyst used in the present invention is as follows:
A catalyst consisting of the following catalyst components (a) and (b) is optimal.

(a) Ti, St, A1. A catalyst component consisting of one or more elements selected from the group consisting of Mg and Zr, (b) Mn, Fe, Co, Ni, Ag, and Au.

A catalyst component comprising one or more elements selected from the group consisting of Pt, Pd, and Rh.

The catalyst component (a) used in the present invention is Ti and Si.

One or more of the elements such as AI, Mg, and Zr may be used in an appropriate combination; however, binary composite oxides consisting of Ti and St, binary composite oxides consisting of Ti and Zr, and Ti.

It is particularly preferable to use at least one of the ternary composite oxides consisting of St and Zr, which exhibit excellent adsorption ability even at room temperature and are capable of discharging odor components in the gas to be treated outdoors. This is extremely effective in preventing

On the other hand, the catalyst component (b) is Mn and Fe.

One or more elements such as Co, Ni, Ag, Au, Pt, Pd, and Rh may be used in an appropriate combination.

The optimal content of ozone in the gas to be treated varies depending on the concentration of odor components, and cannot be determined unconditionally, but it should be around 0.1 to 3 ppm, taking into account the oxidation effect of ozone and the prevention of excess ozone emissions. preferable.

Next, a procedure for producing the ozonolysis deodorizing catalyst used in the present invention using the above catalyst components (a) and (b) will be illustrated.

First, a composite oxide consisting of Ti and Si was prepared according to the following procedure.

As a Ti source, a sulfuric acid aqueous solution of titanyl sulfate having the following composition was used.

T i 0S04 250g/IL (T i 02
tJk calculation) Total H2S04 1100g/u Water 400J2 and ammonia water (NH3, 25%) 28
0Il was added, and Snowtex-NC3-30 (
Separately prepare a solution to which 24 kg of silica gel manufactured by Nissan Chemical (containing approximately 30% by weight as S i 02) is added, and add the above sulfuric acid aqueous solution at 153°C to water at 300°C to dilute the titanium-containing sulfuric acid aqueous solution and stir. The solution was gradually added dropwise to form a coprecipitated gel, which was then allowed to stand for 15 hours. T i 02-3 i 02 obtained in this way
The gel was filtered, washed with water, and then dried at 200°C for 10 hours.

Then, it was fired at 550° C. in an air atmosphere for 6 hours. The composition of the obtained powder is T i 02 : S i 02=
4:1 (molar ratio), and the BET surface area is 185 m'/
It was g.

Using the obtained powder (hereinafter referred to as TS-1), a lattice honeycomb catalyst was prepared according to the procedure described below.

Add an appropriate amount of water to 10 kg of the above TS-1 powder, mix well with a kneader, thoroughly knead with a kneader, and extrude the uniform kneaded product into 50 mm long, 50 mm wide,
A lattice-shaped honeycomb (wall thickness 0.3 mm, opening 1.4 mm) with a length of 50 am was produced, dried at 150°C for 5 hours, and then fired at 300°C for 2 hours in an air atmosphere to obtain a honeycomb molded body. . Subsequently, it was impregnated with an aqueous solution of manganese nitrate, dried and fired to give a weight ratio of TS-1:Mn02=9.
A catalyst of 0:10 was obtained.

Hereinafter, the present invention will be explained in more detail with reference to examples, but the following examples are not intended to limit the present invention.
Any design changes for the purposes described below are included within the technical scope of the present invention.

[Example] Fig. 1 is a schematic explanatory diagram showing an example of the deodorizing device according to the present invention, in which 1 is a rotating rotor, 2 is a casing, 3 is a partition plate, 4 is an exhaust zone, and 5 is an ozone treatment zone. , 6 indicates the intake zone, and 7 indicates the ozone addition line. The rotating rotor 1 has a generally cylindrical honeycomb structure, is configured to rotate in the direction of arrow X, and has an exhaust zone 4 divided by a partition plate 3. The ozonation zone 5 and the intake zone 6 are configured to move in this order. Further, the rotating rotor 1 is equipped with an ozone decomposition catalyst as described above. There are various possible ways to equip the rotor 1 with the catalyst. For example, the catalyst may be held on a carrier, or the rotor 1 may be
For example, 1 itself may be composed of a catalyst.

From the ozone addition line 7, the ozone concentration in the exhaust gas is 0.
Ozone-containing air is introduced from an ozone generator (not shown) so that the ozone concentration is 1 to 5.0 ppm. Then, exhaust gas (gas to be treated) is introduced into the exhaust zone 4, and after the odor components in the exhaust gas are adsorbed in the exhaust zone 4, ozone from the ozone addition line 7 is added to the catalyst in the ozone treatment zone 5. Oxidatively decomposed in the presence of At this time, thermal energy in the exhaust gas is transferred to the rotating rotor 1.

Intake gas (for example fresh air) is then introduced into the intake zone 6 to complete the ventilation and carry the thermal energy of the rotating rotor 1 into the room.

The present inventors used the apparatus shown in Fig. 341 and the titania-silica-based ozonolysis deodorization catalyst (210 cells) shown in the above manufacturing procedure as the material for the rotating rotor 1, and the odor return phenomenon in the animal laboratory. conducted an experiment. Note that the exhaust gas at this time had a humidity of 70% and a temperature of 19° C., and the ammonia concentration in the exhaust gas was 1.3 ppm.

First, an experiment was conducted without adding ozone. As a result, the exhaust gas after passing through the device contained 0.5 ppm of ammonia, and 0.8 ppm of ammonia was adsorbed on the rotating rotor 1, but this ammonia was removed from the intake gas during intake. (in the fresh air) and returned indoors with the entire amount.

Next, ozone was added so that the exhaust gas contained 2.5 ppm of ozone, and an odor return experiment was conducted with other conditions being the same. As a result, the exhaust gas after passing through the device contained 0.3 ppm of ammonia, but the ammonia that returned to the room along with the intake gas was 0.3 ppm. lppm
It was just that. That is, by adding ozone, the amount of ammonia refluxed into the room was reduced to 178. In the above series of experiments, the heat exchange efficiency of the device was 78
%, which is almost the same as the efficiency of a commercially available total heat exchanger using a silica gel-coated aluminum heat exchange rotor, and it was found that the function as a total heat exchanger is sufficient.

Further, the ozone concentration discharged outdoors was 0.01 ppm or less, and the residual ozone concentration was also extremely low.

Although it has been shown that the configuration shown in Figure 1 can be used as a total heat exchanger, the device can also be used as an exhaust zone 4a (see Figure 2) by replacing the intake zone 6 shown in Figure 1 with the exhaust zone 4a (see Figure 2). Can be used as an indoor deodorizer. In this case, the rotating rotor 1 will alternately move between the ozonation zone 5 and the exhaust zone 4.48.

The present inventors conducted a deodorization experiment using the apparatus shown in FIG. The exhaust gas at this time had a humidity of 70%, a temperature of 20° C., and contained 25 ppb of mercaptan. And the ozone concentration in the exhaust gas is 0.5p
When deodorizing was performed while adding ozone so that the amount was 11), the mercaptan concentration in the exhaust gas after treatment was 11)
l) The ozone concentration is below b, and the ozone concentration is 0.01 ppm.
It was below.

If used exclusively as a deodorizing device as shown in FIG. 2, there is an advantage that the scale of the ozone generator can be made smaller compared to existing ozone deodorizing devices. For example, assuming that the exhaust zone 4.48 is 6 times the area of the ozonation zone, the size of the ozone generator to obtain a given ozone concentration is 1/6
It's good and economical.

[Effects of the Invention] As described above, according to the present invention, it has become possible to perform the function as a total heat exchanger while preventing odor components in the exhaust from flowing back into the room. Furthermore, the device of the present invention can be used exclusively as a deodorizing device, and in this case, it has the advantage of requiring less ozone than existing ozone deodorizers, making it extremely effective.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing one embodiment of the deodorizing device according to the present invention, and FIG. 2 is a schematic explanatory diagram showing an example of effective use of the deodorizing device according to the present invention. 1...Rotating rotor 2...Casing 3...
Partition plate 4.48... Exhaust zone 5... Ozone treatment zone 6... Intake zone 7... Ozone addition line Applicant Nippon Shokubai Chemical Co., Ltd.

Claims (2)

[Claims] (1) A rotating rotor with a honeycomb structure is used as a heat exchange unit, and the rotating rotor is equipped with an ozone decomposition and deodorizing catalyst, and the rotating rotor sequentially connects an exhaust zone, an ozone deodorizing treatment zone, and an intake zone in the circumferential direction. A deodorizing device equipped with a total heat exchange function, characterized in that it is configured to be movable and to introduce ozone into the ozone deodorizing treatment zone. (2) A rotating rotor having a honeycomb structure is equipped with an ozone decomposition deodorizing catalyst, and the rotating rotor is configured to alternately move through an exhaust zone and an ozone deodorizing treatment zone in the circumferential direction, and the ozone deodorizing treatment zone is A deodorizing device characterized by being configured to introduce.