JP4459362B2 - Deodorizer for kitchen exhaust - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a kitchen for deodorizing exhaust from a kitchen.exhaustThe present invention relates to a deodorizing apparatus.
[0002]
[Prior art]
For example, the exhaust from a restaurant kitchen is mixed with a large amount of edible oil mist and steam. Conventionally, an adsorbent that adsorbs oil (eg, zeolite) is supported on the surface of a filter medium such as nonwoven fabric. A filter treated the exhaust from the kitchen.
[0003]
[Problems to be solved by the invention]
However, such a conventional adsorption filter has the following problems. First, the oil mist covers the surface of the adsorbent and blocks the pores effective for odor adsorption, so that there is a problem that the odor from the kitchen exhaust cannot be removed effectively. In addition, the oil mist adhering to the adsorption filter is subject to the oxidative and decomposing action of microorganisms, which causes a separate odor. In addition, coarse dust such as cotton dust blocks the ventilation holes of the adsorption filter, increasing the air resistance and making it difficult to blow the processing air.
[0004]
  The present invention has been made in view of the above points, and it is possible to effectively remove these mists from the exhaust from a kitchen mixed with a large amount of edible oil mist and steam, and to prevent the generation of spoiled odors.exhaustIt is an object of the present invention to provide a deodorizing apparatus for use in solving the above problems.
[0005]
[Means for Solving the Problems]
  To achieve the object, the kitchen of claim 1.exhaustAccording to the deodorizing apparatus for use, it is an apparatus for deodorizing the exhaust from the kitchen, installed in a flow path through which the air containing the exhaust from the kitchen passes, and the average value of the diameter of the holes is 4 mm or more ( In the case of a polygonal hole, it has a support having a vent hole whose size is a distance between opposing sides.
And the said support body has the following mixture on the surface at least, It is characterized by the above-mentioned. That is, the mixture is a mixture of at least sepiolite or palygorskite and calcium hydroxide or strontium hydroxide.
[0006]
  According to the knowledge of the inventors, if the support has vent holes having an average diameter of 4 mm or more, it is possible to effectively prevent the holes from being blocked by oil mist. be able to. And since this support body has a mixture of at least sepiolite or palygorskite and calcium hydroxide or strontium hydroxide on its surface, first, oil mist and odor can be effectively removed by sepiolite or palygorskite. The strong alkalinity of calcium hydroxide or strontium hydroxide can suppress the generation of microorganisms and can prevent the occurrence of rot odor. Other strong alkaline chemicals include potassium hydroxide and sodium hydroxide, which are water-soluble and dangerous. In this respect, calcium hydroxide and strontium hydroxide can be safely used because they are strongly alkaline and insoluble in water.
  And the said support body is installed in multiple stages along the air flow in the said flow path, and the magnitude | size of the vent hole of the upstream support body is set smaller than the magnitude | size of the vent hole of the downstream support body. . Therefore, the coarse dust is caught on the upstream side and does not enter the downstream side, that is, the lower support. Therefore, by using the upstream support body as a sacrificial filter and frequently replacing it, it is possible to maintain a good overall effect, that is, both removal of oil mist and deodorization as a whole.
[0009]
  Claim2If the support members at each stage are installed at intervals as shown above, the target air is diffused in the space when the processing target air flows to the support member at the next stage, and local deterioration of the support member is prevented. .
[0010]
  Claim3Thus, if at least a part of the upstream support or the upstream side of the support is exchangeable, the upstream support or the upstream part of the support is useful when used as a sacrificial filter. is there.
[0011]
  The amount of oil mist adhering to the upstream support is greater.4As per support length per unit lengthInCalcium hydroxideOr strontium hydroxideInclusionAmountIf the number of upstream supports is greater than that of downstream supports, it is possible to effectively prevent the generation of odor due to decay.
[0012]
In addition, if a support body has an adsorbent for removing odor, the deodorizing effect is further enhanced. Here, the adsorbent for removing odor suitable for the present invention is, for example, hydrophobic zeolite, fly-pontite mineral alone, or hydrophobic zeolite, fly-pontite mineral, or diatomaceous earth, silica, alumina, a mixture of silica and alumina. , Aluminum silicate, activated alumina, porous glass, activated clay, activated bentonite, or an inorganic powder composed of at least one of synthetic zeolite and an inorganic acid or organic acid impregnated. In the case where the support is installed in multiple stages, it is preferable that the odor removing adsorbent is provided on the downstream support.
[0013]
  The flow pathMay be a flow path through which air flows after the air exhausted from a plurality of exhaust parts has gathered. That is, if a support is installed in a flow path (for example, a duct) after air exhausted from a plurality of kitchens or hoods on a plurality of cooking tables is gathered, exhaust from a large number of exhaust parts is concentrated. It is efficient because it can be deodorized. It is also advantageous in terms of maintenance.
[0014]
If a deodorizing section for removing at least organic odor, acidic odor or basic odor is provided on the downstream side of the support, deodorization treatment can be performed for various odors.
The deodorizing material that can be used in these deodorizing parts includes the above-mentioned hydrophobic zeolite, fly-pontite mineral alone, or hydrophobic zeolite, fly-pontite mineral, or diatomaceous earth, silica, alumina, a mixture of silica and alumina, and silicic acid. Examples include an inorganic powder or an organic acid impregnated with an inorganic powder made of at least one of aluminum, activated alumina, porous glass, activated clay, activated bentonite, and synthetic zeolite.
[0015]
  The support is a claim.5As shown in the above, it is formed by making a slurry containing at least the sepiolite or palygorskite, calcium hydroxide or strontium hydroxide powder, and a binder as essential components, and in the slurry, the at least sepiolite or Palygorskite has a particle size of 10% or less with a 50% upper curve and a specific gravity of 0.3 g / cm.³~ 8g / cm³, Calcium hydroxide or strontium hydroxide has a particle size of 10% or less and a specific gravity of 0.3 g / cm with a 50% curve on the sieve.³~ 8g / cm³It is preferable that
[0016]
  Furthermore, the claim6As described above, using a slurry having at least sepiolite or palygorskite, calcium hydroxide or strontium hydroxide powder, and a binder as essential components, these mixed substances are supported on the surface of the support, and in the slurry, The at least sepiolite or palygorskite has a particle diameter of 50% on the screen with a particle diameter of 10 μm or less and a specific gravity of 0.3 g / cm.³~ 8g / cm³, Calcium hydroxide or strontium hydroxide has a particle diameter of 50% on the sieve and a particle diameter of 10 μm or less and a specific gravity of 0.3 g / cm 3.³~ 8g / cm³You may comprise so that it is.
[0017]
  The upper curve is a cumulative curve used in the particle size distribution display method, and the vertical axis is a cumulative value (%) or a vertical value (100−cumulative value (%)). TakeClaims 5 and 6According to the configuration, it is possible to increase the content per unit volume and efficiently exhibit the deodorizing effect. According to the knowledge of the inventors, when the paper is made and supported using slurry containing sepiolite or palygorskite, calcium hydroxide or strontium hydroxide powder, and a binder as essential components, On the other hand, if it is too large, the number of particles that precipitate and are dispersed in the slurry decreases, which is not preferable. Therefore, the specific gravity is also 0.3 g / cm.³~ 8g / cm³The range is suitable.
  The weight ratio of calcium hydroxide or strontium hydroxide to the sepiolite or palygorskite is preferably 1% to 50%. According to the verification by the inventors, if the weight ratio of calcium hydroxide or strontium hydroxide to the sepiolite or palygorskite is less than 1%, the oil absorption capacity of these calcium hydroxide or strontium hydroxide is sufficient, but after adsorption. The growth of microorganisms in the oil mist was not sufficiently prevented, and a rotten odor was generated from the oil absorbed by calcium hydroxide and strontium hydroxide, and the deodorizing effect was significantly impaired. On the other hand, when the weight ratio of calcium hydroxide or strontium hydroxide to sepiolite or palygorskite exceeded 50%, the oil absorption capacity of sepiolite or palygorskite was significantly reduced. As a result, the oil mist that could not be adsorbed closed the pores of the adsorbent for odor removal, and the deodorizing effect was significantly impaired. Therefore, in the present invention, it is effective that the weight ratio of calcium hydroxide or strontium hydroxide to the sepiolite or palygorskite is 1% to 50%.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described. FIG. 1 shows a simplified deodorizing system using a deodorizing apparatus 1 according to the present embodiment. While the exhaust from the hood 4 installed above the cooking table 3 is exhausted from the exhaust port 8 opened to the outside by the fan 7 through the ducts 5 and 6, the deodorizing device 1 installed in the duct 6 The system is configured as a system that removes oil mist and oil vapor in the exhaust from the kitchen 2, removes odors, and does not generate a rotten odor of oil.
[0019]
In the present embodiment, the filter 10 includes a single filter 10, and the filter 10 has a structure in which two supports 11 and 12 are connected as shown in FIG. 2. The supports 11 and 12 basically have the same structure. First, the support 11 positioned on the upstream side will be described with reference to FIG. 3. This support 11 is composed of a honeycomb structure as shown in the figure, and its length L in the flow direction is 300 mm. Roughness (distance between two opposing sides) D is 10 mm. This honeycomb structure includes, for example, (1) inorganic fibers such as ceramic fibers, (2) organic fibers such as pulp, and (3) a mixture of at least sepiolite or palygorskite and calcium hydroxide or strontium hydroxide. : (2): (3) is blended at a weight of 2: 1: 15, and is made into a thickness of 0.3 mm by a wet papermaking method. It can be obtained by appropriately forming a sheet made by this papermaking.
[0020]
  In such a case, the particle diameter of at least 50% of sepiolite or palygorskite on the screen is 10 μm or less and the specific gravity is 0.3 to 8 g / cm 3.³, The particle diameter of 50% of the upper curve of calcium hydroxide is 10 μm or less and the specific gravity is 0.3-8 g / cm.³It is preferable that the sheet is formed by making a slurry containing these powders and a binder (for example, silica sol) as essential components. As another manufacturing method, the slurry is used, and an appropriate material (for example, a sheet made of inorganic fibers or ceramic fibers) is immersed in the slurry and then dried.,You may make it carry | support on the surface.
[0021]
On the other hand, the support 12 located on the downstream side has a structure in which hydrophobic zeolite is supported on the surface of the support 11. And the content per unit area, such as a component in each support body 11 and 12, is as follows.
・ Support 11
Sepiolite + calcium hydroxide is 300g / m²
・ Support 12
Sepiolite + hydrophobic zeolite is 300g / m²
[0022]
As shown in FIG. 4, the support bodies 11 and 12 thus configured are connected along the ventilation direction, and stainless steel panels 13, 14, 15 and 16 are arranged on the outer peripheral surface thereof. The filter 10 is configured by holding the holding plates 17 and 17 before and after being housed in a rectangular tube body and before and after the air flow direction.
[0023]
Next, the result of actually treating the exhaust from the kitchen 2 using the deodorizing apparatus 1 according to the above embodiment will be described below.
[0024]
(1) Air to be treated
The outline of the air to be treated for deodorization is as follows.
1) Deodorize the kitchen exhaust in the office building restaurant area. The purpose of deodorization is to reduce the odor concentration to such a level that residents around the building do not feel odor.
2) Exhaust air volume: 100,000m³/time
3) Temperature and humidity of treated air: 35 ° C, 75% RH
4) Odor concentration of treated air (odor concentration on the upstream and downstream sides of the filter 10)
Upstream side: Odor concentration 3,000
Downstream side: Odor concentration target value 300
Here, the odor concentration of the air means that when the subject air is diluted with clean air that does not contain any odor (in other words, it does not contain any odor-causing substance), subjects with normal olfaction feel odor. It is defined as the “minimum dilution factor that disappears”. For the same odor-causing substance, the odor concentration is proportional to the absolute amount of the odor-causing substance contained in the air per unit volume (also called substance concentration, often expressed in ppm). However, if the types of odor-causing substances are different, the odor concentration varies greatly even with the same substance concentration. For example, the concentration at which hydrogen sulfide can finally be sensed is 0.5 ppb, and ammonia is 0.15 ppm. That is, when two types of air each containing ammonia and hydrogen sulfide having the same substance concentration are compared, the odor concentration of the air containing hydrogen sulfide is 300 times larger than the odor concentration of the air containing ammonia.
5) Odor-causing substances contained upstream of the processing air
FIG. 5 shows the concentration and odor intensity of the malodor-causing substance measured in the treated air. It is a measurement result only for substances with regulatory standards in the Odor Control Law. The concentrations of these malodorous substances were measured as follows.
(1) First, an odor-causing substance is collected by ventilating air containing the odor-causing substance through a collection tube filled with an adsorbent.
(2) A heated inert gas (nitrogen, helium, etc.) is passed through the collection tube to desorb odor-causing substances once collected in the adsorbent.
(3) Heated inert gas containing odor-causing substances is analyzed by GC-MS (gas chromatography / mass spectroscopy).
Odor intensity is a six-stage scale used as a standard for setting the standard value in the Odor Prevention Law. The measurer sniffs the smell directly, and how the intensity is perceived is based on the odor intensity scale. Digitize. For typical malodorous substances, a relational expression between substance concentration and odor intensity is obtained, and the odor intensity can be calculated from the substance concentration using this expression. According to the 6-level odor intensity display method, it is as follows.
0: Odorless
1: Scent that can be finally detected (detection threshold concentration)
2: A weak smell that shows what smell it is
3: Smell that can be easily detected
4: Strong smell
5: Strong smell
6) Concentration of oil mist and other dust contained in the upstream side of the processing air
The oil mist concentration and other dust concentrations were measured as follows.
(1) Air containing odor-causing substances is passed through a glass fiber filter (pore diameter: 0.3 to 8 μm), and oil mist and other dust are all collected in the membrane filter.
(2) When the total weight of floating dust (oil mist and other dust) collected on the membrane filter is measured and converted to the total weight contained upstream of the processing air, 0.3 mg / m³Met.
(3) The collected floating dust was dispersed in a benzene solution, filtered and dried, and the weight ratio insoluble in benzene was measured. As a result, it became clear that the component soluble in benzene was 1/3 of the total suspended dust, and the component insoluble in benzene was 2/3 of the total suspended dust. If the former is oil mist and the latter is dust other than oil mist, the oil mist is 0.1 mg / m upstream of the processing air.³Contained, dust other than oil mist is 0.2mg / m³Will be included.
[0025]
(2) Components of the upstream support 11
The weight ratio of calcium hydroxide to sepiolite is within the range of the present invention, 1%, 5%, 10%, 20%. Each of 30%, 40%, and 50% was examined. For comparison, the same values of 0.1%, 0.5%, 60%, and 80% were also examined.
[0026]
The ventilation speed in the duct 6 was 2.5 m / s.
[0027]
(3) Results
The measurement results are shown in the table of FIG. As can be seen from this table, it was confirmed that when the weight ratio of calcium hydroxide to sepiolite was between 1% and 50%, there was a high deodorizing effect over a long period of time. However, in the case of 0.1%, the target value of 300 is exceeded in about 1 month and in the case of 0.5% in about 3 months, and in the case of 60%, it is 3 months and in the case of 80%. The target value has already been exceeded in two months. From the above, the optimal weight ratio of calcium hydroxide to sepiolite is between 1% and 50%. The same applies not only to sepiolite but also to palygorskite and both.
[0028]
Next, regarding the support 11, when the weight ratio of calcium hydroxide to sepiolite shown in FIG. 6 is 20%, the content of the constituent material when the structure of the support 11 is as follows will be considered.
[0029]
That is, a sheet constituting the support 11 was manufactured by adding glass fibers to a slurry in which sepiolite / calcium hydroxide powder and a silica sol binder were mixed, and making paper and drying. The mixing ratio (weight ratio) of sepiolite, calcium hydroxide, silica sol binder, and glass fiber contained in the slurry was 10: 2: 1: 1. The particle diameter of the sepiolite and calcium hydroxide powder and the weight of each component contained in the sheet (papermaking) per unit volume at this time are shown in the table of FIG.
[0030]
As can be seen from the results shown in this table, when the particle size of sepiolite and calcium hydroxide exceeds 10 μm, precipitation tends to occur in the slurry, and the content in the papermaking is significantly reduced, so that the deodorizing function is sufficiently exerted. It may not be possible. Therefore, preferably, as shown in claims 10 and 11, the particle diameter of the 50% upper curve is preferably 10 μm or less.
[0031]
Next, in the support 11, when the weight ratio of calcium hydroxide to sepiolite shown in FIG. 6 is 20%, an equivalent of 20 mm is cut from the upstream side of the support 11 in the air flow direction, and the honeycomb The result of comparing the case where a honeycomb structure having a mesh size of 5 mm is attached with the case where the mesh size is kept 10 mm is shown in the table of FIG.
[0032]
As can be seen from this result, a significant amount of oil mist was adsorbed on the fine honeycomb part in the upstream part by making the mesh of the upstream honeycomb finer. As a result of the reduction in the amount of oil mist leaking downstream, the chance of the oil mist blocking the pores of the adsorbent for removing odor is significantly reduced, and the downstream odor concentration is considered to be considerably reduced. Therefore, if only the upstream portion of the support 11 is divided and exchangeable, the fine honey-comb structure on the upstream side is positioned upstream so that the odor concentration on the downstream side can be increased for a long time. Can be maintained over a long period of time, and it is not necessary to replace all the supports, and there is no waste. When the honeycomb structures are attached in contact with each other, the adsorption effect is not reduced even if they are manufactured with the same dimensions as the filter of FIG. Moreover, you may give the function of oil adsorption | suction to a part of predetermined thickness (length of a ventilation direction).
[0033]
Further, if it is possible to divide and replace the finer portion of the honeycomb on the upstream side as described above, there are the following advantages. That is, coarse cotton dust is caught in the fine part of the honeycomb entrance portion and does not enter the deep part of the honeycomb and cause clogging. Therefore, it is only necessary to replace only the support of the fine part when the inlet side of the support of the fine part of the upstream side is closed, and in any case, it is possible to avoid the waste of replacing the whole support. Also, since there is no deterioration in the life of the downstream deodorizing filter due to the adhesion of oil components, it is possible to replace the filter by accurately predicting the life.
[0034]
On the other hand, the closer to the downstream outlet of the support, the smaller the amount of oil mist accumulated, so the portion near the downstream outlet is less prone to the occurrence of spoilage odor due to the propagation of microorganisms and oxidation / decomposition. Therefore, the content of calcium hydroxide that suppresses the growth of microorganisms is small. Therefore, even if the content of calcium hydroxide in the downstream support per unit length in the air flow direction is less than that in the upstream, it is possible to suppress the growth of microorganisms evenly over the entire support. become.
[0035]
For example, the support 11 in FIG. 3 will be described as an example. In the downstream portion of the air flow direction indicated by the arrow in the drawing, the content of calcium hydroxide is less than that in the upstream portion. You may make it do. As a result, the amount of calcium hydroxide in the entire support 11 can be reduced.
[0036]
On the other hand, from the viewpoint of reducing the amount of calcium hydroxide, the content of sepiolite and palygorskite increases, so that oil components with low concentration leaking from the upstream side can be efficiently removed. become. The above sky is the same when strontium hydroxide is used instead of calcium hydroxide.
[0037]
Next, another embodiment will be described. FIG. 9 shows a simplified deodorizing system using the deodorizing apparatus 50 according to the second embodiment, and this deodorizing system is applied. Is the same setting as that of the above embodiment, and exhaust from the hood 4 installed above the cooking table 3 in the kitchen 2 is exhausted from the exhaust port 8 opened to the outside by the fan 7 through the ducts 5 and 6. During the exhaust, the deodorizing device 50 installed in the duct 6 removes the oil mist in the exhaust from the kitchen 2 and removes the odor and does not generate a decaying odor.
[0038]
In the deodorizing apparatus 50 according to the second embodiment, five filters 60, 70, 80, 90, 100 having a structure in which a support is appropriately surrounded by a panel or the like are serially arranged in the duct 6 along the air flow. In preparation. That is, the deodorizing apparatus 50 according to the present embodiment has a configuration in which the support is arranged in five stages in series. The basic configuration of each filter 60, 70, 80, 90, 100 is the same, and the details of the first-stage filter 60 located on the upstream side will be described with reference to FIG.
[0039]
FIG. 10 is an exploded perspective view of the filter 60. As shown in the drawing, the support 61 included in the filter 60 is formed of a honeycomb structure similar to the support 11 in the above-described embodiment, and the flow direction Length L = 200 mm, and the roughness of the eyes (distance between opposing vertices) is 10 mm, which is the same as that of the support 11. As for the constitution, (1) inorganic fibers such as ceramic fibers, (2) organic fibers such as pulp, and (3) at least a mixture of sepiolite or palygorskite and calcium hydroxide (1): (2): (3) ▼ is blended at an equal weight of 1: 1: 1, and is made by wet paper making to a thickness of 0.4 mm, and is obtained by appropriately forming a sheet made by this paper making. is there.
[0040]
In addition, at least 50% of sepiolite or palygorskite has a particle diameter of 10% or less and a specific gravity of 0.3 to 8 g / cm.³, The particle diameter of 50% of the upper curve of calcium hydroxide is 10 μm or less and the specific gravity is 0.3-8 g / cm.³The sheet is made by making a slurry containing these powders and a binder (for example, silica sol) as essential components.
[0041]
As shown in FIG. 10, the support 61 configured in this manner is housed in a cylindrical body having aluminum panels 62, 63, 64, 65 arranged on the outer peripheral surface thereof, and further, air Holding plates 66 and 67 are arranged before and after the flow direction to constitute a filter 60.
[0042]
The second-stage filter 70 also has the same structure as the first-stage filter 60, but the amount of calcium hydroxide relative to sepiolite is different. That is, the support 61 of the first stage filter 60 has a weight ratio of calcium hydroxide to sepiolite of 30%, whereas the support of the second stage filter 70 has a weight ratio of calcium hydroxide to sepiolite. 10%. That is, the amount of calcium hydroxide in the support of the second stage filter 70 is smaller than that of the first stage filter 60. As described above, this is based on the fact that the amount of oil mist accumulated in the downstream side is small, so that the content of calcium hydroxide and strontium hydroxide to suppress the growth of microorganisms is small.
[0043]
The support of the third-stage filter 80 has the same overall structure as the support 61 of the first-stage filter 60 and the support of the first-stage filter 70, but the support is made of an inorganic material. Ceramic paper baked (including sepiolite) is used. The support of the third-stage filter 70 has a structure in which a hydrophobic zeolite is further supported on the surface thereof.
[0044]
The support of the fourth-stage filter 90 can be the same as the support of the third-stage filter 80 as a whole, but the structure of the fourth-stage filter 90 is further provided on the surface. It has a structure in which frypontite mineral is supported.
[0045]
The support of the fifth-stage filter 100 can be the same as the support of the third-stage filter 80 as a whole, but the support of the fifth-stage filter 100 is on the surface. Furthermore, from at least one of hydrophobic zeolite, fly-pontite mineral, or diatomaceous earth, silica, alumina, a mixture of silica and alumina, aluminum silicate, activated alumina, porous glass, activated clay, activated bentonite, or synthetic zeolite. It has a structure in which an inorganic powder or an inorganic acid added thereto is supported on an inorganic powder.
[0046]
The content per unit area of the components and the like in each support of the filters 60, 70, 80, 90, and 100 in each stage is as follows.
-First stage filter 60, second stage filter 70
Sepiolite + calcium hydroxide is 300g / m²
-Third stage filter 80
Hydrophobic zeolite is 200 g / m²
・ Fourth stage filter 90
Frypontite mineral is 200g / m²
・ Fifth stage filter 100
It consists of at least one of hydrophobic zeolite, fly-pontite mineral, or diatomaceous earth, silica, alumina, a mixture of silica and alumina, aluminum silicate, activated alumina, porous glass, activated clay, activated bentonite, or synthetic zeolite. 300g / m for inorganic powder with inorganic acid or organic acid impregnated²
It is.
[0047]
If the deodorizing apparatus 50 according to the second embodiment is used, dust in the exhaust air from the kitchen is first collected and removed by the first-stage filter 60 as shown in FIG. Mist and oil vapor are also adsorbed and removed by the first-stage filter 60. Oil mist and oil vapor leaking from the first stage filter 60 are also adsorbed and removed by the second stage filter 70.
[0048]
And since the support body of the filter 80 of the 3rd stage has hydrophobic zeolite as stated above, it is possible to remove organic odor. As described above, since the support of the filter 90 in the next stage has the fly-pontite mineral, it is possible to remove particularly acidic odor. The last support of the filter 100 is hydrophobic zeolite, frypontite mineral or diatomaceous earth, silica, alumina, a mixture of silica and alumina, aluminum silicate, activated alumina, porous glass, activated clay, activated bentonite or Since the inorganic powder composed of at least one of the synthetic zeolites is impregnated with an inorganic acid or an organic acid, it is particularly excellent in removing a basic odor.
[0049]
When the inventors actually examined the deodorizing effect with the same air and the ventilation rate that were treated in the above embodiment, the organic malodorous substances were removed with high efficiency of 90% or more, and ammonia was removed. In addition, hydrogen sulfide could be removed with an efficiency of 80% or more. Finally, the odor concentration of 3000 on the upstream side could be reduced to 300 or less, which is the target value for the downstream odor concentration.
[0050]
Further, in the deodorizing apparatus 60 of the second embodiment, the filters 60, 70, 80, 90, 100 of each stage having a support are placed in the duct 6 with a space therebetween as shown in FIG. Since it is installed, the air to be treated after passing through the preceding filter is diffused and stirred while passing through the interval. Therefore, it is possible to suppress local degradation in the next-stage filter.
[0051]
Further, in the deodorizing apparatus 50 according to the second embodiment, the content of the support in the first-stage filter 60 is the weight ratio of calcium hydroxide to sepiolite is 20%, and the support in the second-stage filter 70. The weight ratio of calcium hydroxide to sepiolite is 10%, and the support content in the third stage filter 80 is 50% of the weight ratio of (hydrophobic zeolite + flypontite mineral) to sepiolite. When the fourth-stage filter 90 and the fifth-stage filter 100 are removed, most of the oil mist and dust are removed by the first-stage filter 60, and removed by the first-stage filter 60. The oil component that could not be removed is adsorbed by the second-stage filter 70, and the organic odor substance and acid odor substance by the third-stage filter 80. It will be removed. That is, according to the kind of malodorous substance to be removed, it is possible to configure the support using only the necessary adsorbent. By the way, when a similar experiment was carried out under the same conditions as in the second embodiment with such a three-stage deodorization apparatus, organic malodorous substances were removed with a high efficiency of 90% or more, and hydrogen sulfide was also 80%. It could be removed with the above efficiency.
[0052]
When the support is configured for the second-stage filter 70 described above, a honeycomb structure constituting the support may be made by mixing hydrophobic zeolite in addition to sepiolite and calcium hydroxide. Furthermore, it is also possible to make a honeycomb structure by mixing fly pondite mineral in addition to sepiolite and calcium hydroxide to remove acidic malodorous substances simultaneously with oil components.
[0053]
In the deodorizing system to which the deodorizing apparatus in each of the embodiments described above is applied, the exhaust from one kitchen is treated in one duct for the convenience of explanation of the drawings. It is efficient if the deodorizing apparatus of the present invention is installed and processed after collecting exhaust from the exhaust parts such as a plurality of kitchens and a plurality of hoods.
[0054]
FIG. 11 shows such an application example. In the deodorizing system of FIG. 11, the kitchens 111, 112, 113, 114 on the ground floor of the building 110 such as a building and the kitchen 121 on the basement floor, The exhaust from 122 and 123 is gathered by ducts 131 and 132, respectively, and exhausted from the duct 134 to the outside by a fan 133. Further, the deodorizing apparatus of the present invention (for example, the deodorizing apparatus 1 and 50) includes Thus, it shows a state where the air to be treated is installed in the duct 134 through which the air flows.
[0055]
By installing the deodorizing device according to the present invention in the air flow path after collecting the exhaust from the kitchens on each floor in this way, all the kitchen exhausts in one building 110 are processed at one place. Can do. Therefore, it is efficient and maintenance can be concentrated. In addition, the overall cost can be kept low.
[0056]
The support used in the above embodiment is a honeycomb structure having a literally hexagonal cross section of the eyes. Of course, the support is not limited to this, and the cross section of the eyes, that is, the vents may be triangular, square, etc. It may be a polygon, a circle or an ellipse. As shown in FIGS. 1 and 9, if each embodiment is applied, if a mechanism 9 for removing oil by a separate grease removing device (such as a grease filter or a grease extractor) is provided in the hood 4, The burden of removing oil on the upstream support of the deodorizing apparatuses 10 and 50 can be reduced, and the life of each support can be extended.
[0057]
In the above embodiment, for example, in the case of the deodorization system shown in FIG. 9, as shown in FIG. 12, the filter 60 is disposed at a position perpendicular to the flow direction of the processing air without the duct 6. However, instead of this, as shown in FIG. 13, for example, a plurality of filters 60 may be disposed obliquely with respect to the flow direction to process the processing air. In the example of FIG. 13, the four filters 60 are arranged so as to face each other diagonally so as to take charge of a half cross-sectional area of the pair of two filters 60 without the duct 6. By arranging in this way, it is possible to reduce the amount of processing air per unit area, obtain a higher deodorizing effect, and extend the life of the filter. Of course, the present invention is not limited to the example shown in FIG. This is the same when a single-stage filter is installed, and in the case of multiple stages, such an oblique arrangement may be adopted as a part thereof.
[0058]
【The invention's effect】
According to the present invention, it is possible to efficiently deodorize the exhaust from the kitchen, and to suppress the occurrence of rot odor. Of course, oil mist and oil vapor contained in the exhaust gas can be efficiently removed.
[0059]
In particular, in the case of claims 3 and 5, an efficient operation can be performed, and in the case of claim 4, local deterioration of the support can be suppressed. Furthermore, in the case of claim 6, it is possible to effectively use calcium hydroxide or strontium hydroxide, and the function according to the situation can be exhibited as a whole. In the case of claim 7, exhaust gas from a plurality of kitchens or the like can be processed in a concentrated manner, which is efficient. According to the kitchen exhaust deodorization apparatus of claims 9 and 10, the deodorization action can be efficiently exhibited.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of a kitchen deodorizing system to which a deodorizing apparatus according to a first embodiment of the present invention is applied.
FIG. 2 is a perspective view of a support in the deodorizing apparatus according to the first embodiment of the present invention.
FIG. 3 is a perspective view of a single support before connection of the support of FIG. 1;
FIG. 4 is an exploded perspective view of a filter of the deodorizing apparatus according to the first embodiment of the present invention.
FIG. 5 is a chart of malodor-causing substance concentrations contained in the processing air used for examining the effect of the deodorizing apparatus according to the first embodiment.
FIG. 6 is a chart of odor concentration after treatment showing the effect of the deodorizing apparatus according to the first embodiment.
FIG. 7 is a chart showing the particle size of components contained in a support and the weight of components contained in papermaking per unit volume.
FIG. 8 is a chart showing the results of examining the odor concentration of the air after treatment when the roughness of the upstream support is changed for each elapsed month.
FIG. 9 is an explanatory diagram showing an outline of a kitchen deodorizing system to which a deodorizing apparatus according to a second embodiment of the present invention is applied.
FIG. 10 is an exploded perspective view of a filter of a deodorizing apparatus according to a second embodiment of the present invention.
FIG. 11 is an explanatory diagram showing an outline of a system for concentrating and processing exhaust from a plurality of kitchens in a building.
12 is an explanatory diagram showing a state of arrangement of filters in a duct in the deodorizing system of FIG.
FIG. 13 is an explanatory diagram showing a state in which a filter is disposed obliquely in a duct.
[Explanation of symbols]
1,50 Deodorizer
2 Kitchen
4 Food
5,6 Duct
7 fans
8 Exhaust vent
10, 60, 70, 80, 90, 100 filter
11, 61 Support

Claims (9)

A device for deodorizing exhaust from a kitchen,
A support body provided in a flow path through which air containing exhaust from the kitchen passes, and having a vent hole with an average diameter of holes of 4 mm or more;
The support is installed in multiple stages along the air flow in the flow path,
The size of the vent hole in the upstream support is smaller than the size of the vent hole in the downstream support,
A deodorizing apparatus for kitchen exhaust, wherein the support has at least the following mixture on the surface thereof.
Mixture: at least with sepiolite or palygorskite,
Mixture with calcium hydroxide or strontium hydroxide The deodorizing apparatus for kitchen exhaust according to claim 1, wherein the supports of each stage are installed at intervals. The deodorizing apparatus for kitchen exhaust according to claim 1 or 2, wherein the upstream support or at least a part of the upstream of the support is replaceable. The content of calcium hydroxide or strontium hydroxide in the support per unit length in the aeration direction is higher in the upstream support than in the downstream support. A deodorizing apparatus for kitchen exhaust according to the above. A device for deodorizing exhaust from a kitchen,
A support body provided in a flow path through which air containing exhaust from the kitchen passes, and having a vent hole with an average diameter of holes of 4 mm or more;
The support is formed by making a slurry of at least sepiolite or palygorskite, calcium hydroxide or strontium hydroxide powder, and a binder as essential components.
The at least sepiolite or palygorskite has a particle diameter of 50% on the screen and a specific gravity of 0.3 g / cm ^{3 to} 8 g / cm ³ .
Calcium hydroxide or strontium hydroxide is
The particle diameter of a 50% upper curve is 10 μm or less and the specific gravity is 0.3 g / cm ^{3 to} 8 g / cm ^3.
And
The deodorizing apparatus for kitchen exhaust, wherein the support has a mixture of at least sepiolite or palygorskite and calcium hydroxide or strontium hydroxide at least on the surface thereof. A device for deodorizing exhaust from a kitchen,
A support body provided in a flow path through which air containing exhaust from the kitchen passes, and having a vent hole with an average diameter of holes of 4 mm or more;
The support is composed of a slurry containing at least sepiolite or palygorskite, calcium hydroxide or strontium hydroxide powder, and a binder as essential components, and supporting these mixed substances on the surface of the support. In the slurry, the at least sepiolite or palygorskite is
The particle diameter of the upper curve of 50% is 10 μm or less and the specific gravity is 0.3 g / cm ^{3 to} 8 g / cm ³ ,
Calcium hydroxide or strontium hydroxide is
The particle diameter of a 50% upper curve is 10 μm or less and the specific gravity is 0.3 g / cm ^{3 to} 8 g / cm ^3.
And
The deodorizing apparatus for kitchen exhaust, wherein the support has a mixture of at least sepiolite or palygorskite and calcium hydroxide or strontium hydroxide at least on the surface thereof. The deodorizer for kitchen exhaust according to any one of claims 1 to 6, wherein a weight ratio of calcium hydroxide or strontium hydroxide to at least sepiolite or palygorskite in the mixture is 1% to 50%. The deodorizing apparatus for kitchen exhaust according to any one of claims 1 to 7, wherein the flow path is a flow path through which air after the air exhausted from a plurality of exhaust parts gathers flows. The deodorizing apparatus for kitchen exhaust according to any one of claims 1 to 8, further comprising a deodorizing unit that removes at least an organic odor, an acidic odor, or a basic odor on the downstream side of the support.

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