VOC adsorption rotor

Abstract

The present invention provides a VOC adsorption rotor capable of desorbing adsorbed VOCs with high energy efficiency. A VOC adsorption rotor (10) is provided with a honeycomb structure (1) that carries an adsorbent for adsorbing VOC, and the honeycomb structure (1) contains a metal.

Description

Technical Field

[0001] The present invention relates to a VOC adsorption rotor for adsorbing VOC contained in a treatment target gas. Background Art

[0002] In the past, a honeycomb-type VOC adsorption rotor for adsorbing volatile organic compounds (VOC) has been known. Conventional VOC adsorption rotors use ceramics, glass, etc. as a substrate and carry an adsorbent for adsorbing VOC. Patent document 1 discloses a gas treatment device equipped with such a VOC adsorption rotor.

[0003] The VOC adsorption rotor is provided with an adsorption zone for adsorbing VOC contained in the treatment target gas, a desorption zone for desorbing VOC adsorbed in the adsorption zone by passing the heated gas, and a cooling zone for cooling the VOC adsorption rotor heated in the desorption zone. That is, during one rotation of the VOC adsorption rotor, VOC is adsorbed in the adsorption zone, VOC is desorbed in the desorption zone, and the rotor is cooled in the cooling zone. Furthermore, the VOC is adsorbed again in the adsorption zone.

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-77969 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] Conventional VOC adsorption rotors heat gas to desorb VOC adsorbed in the adsorption zone and pass the heated gas through the desorption zone. Therefore, the energy efficiency for desorbing VOC is not high and there is room for improvement.

[0009] The present invention is an invention that solves the above-mentioned problems, and an object of the present invention is to provide a VOC adsorption rotor that can desorb adsorbed VOC with high energy efficiency.

[0010] Technical solutions to solve problems

[0011] The VOC adsorption rotor of the present invention comprises a honeycomb structure supporting an adsorbent for adsorbing VOC, and is characterized in that:

[0012] The honeycomb structure includes metal.

[0013] Effects of the Invention

[0014] According to the VOC adsorption rotor of the present invention, the honeycomb structure carrying the adsorbent for adsorbing VOC contains metal, so it can be electrified. Therefore, for example, in the desorption zone, by passing current through the honeycomb structure to generate Joule heat, the honeycomb structure can be directly heated, and the adsorbed VOC can be desorbed with high energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view schematically showing the structure of a VOC adsorption rotor in one embodiment.

[0016] Figure 2 It is a plan view schematically showing the structure of a VOC adsorption rotor in one embodiment when viewed in the extending direction of the rotation shaft.

[0017] Figure 3 This is a diagram for explaining that a pair of electrodes in contact with the VOC adsorption rotor are arranged on both outer sides of the VOC adsorption rotor in the rotation axis direction in the desorption zone to apply a voltage.

[0018] Figure 4 , (a) is a diagram showing a first fine shape reproducing model as a model of a honeycomb structure, and (b) is a diagram showing a first uniform equivalent physical property model corresponding to the first fine shape reproducing model.

[0019] Figure 5 , (a) is a diagram showing a second fine shape reproducing model as a model of a honeycomb structure, and (b) is a diagram showing a second uniform equivalent physical property model corresponding to the second fine shape reproducing model.

[0020] Figure 6 (a) is a graph showing normalized conductivity in the X-axis direction and normalized conductivity in the Y-axis direction relative to (2Lb / La), and (b) is a graph with the vertical axis of the graph shown in (a) set as a logarithmic axis.

[0021] Figure 7 Among them, (a) is a diagram showing the simulation results of temperature distribution when the first uniform equivalent property model is used, (b) is a diagram showing the simulation results of temperature distribution when the second uniform equivalent property model is used, and (c) is a three-dimensional diagram showing that four blocks are stacked in an up-down and left-right configuration. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the present invention will be shown, and features of the present invention will be specifically described.

[0023] Figure 1 It is a perspective view schematically showing the structure of the VOC adsorption rotor 10 in one embodiment. Figure 2It is a plan view schematically showing the structure of the VOC adsorption rotor 10 in one embodiment when viewed in the extending direction of the rotating shaft 11 (hereinafter, sometimes referred to as the rotating shaft direction).

[0024] The VOC adsorption rotor 10 is driven by a motor or the like and is rotatable about a rotation shaft 11. The diameter of the VOC adsorption rotor 10 is, for example, 500 mm to 2000 mm, and the dimension of the rotation shaft 11 in the extension direction is, for example, 200 mm to 800 mm.

[0025] The VOC adsorption rotor 10 includes a honeycomb structure 1 that supports an adsorbent for adsorbing VOCs. The honeycomb structure 1 includes a metal such as stainless steel. However, the metal constituting the honeycomb structure 1 is not limited to stainless steel. In addition, the VOC adsorption rotor 10 may be configured to include a metal as a whole, or a portion other than the honeycomb structure 1 may be composed of a material other than metal.

[0026] The shapes of the plurality of cells 2 constituting the honeycomb structure 1 can be any shapes. Figure 2 In the example shown, the cell 2 is triangular in shape when viewed in the extending direction of the rotation axis 11. However, the cell 2 may be hexagonal, rectangular or other shapes when viewed in the rotation axis direction.

[0027] The adsorbent carried on the honeycomb structure 1 can be any adsorbent as long as it can adsorb VOC contained in the treatment target gas, for example, zeolite, activated carbon, silica, etc. can be used. The treatment target gas is, for example, a gas containing VOC generated by cleaning, printing, coating, drying, etc. in a factory. In addition, the present invention is not limited by the type of VOC to be removed or the type of adsorbent.

[0028] A catalyst for decomposing VOC may be supported on the honeycomb structure 1. As the catalyst for decomposing VOC, for example, platinum, palladium, etc. can be used.

[0029] like Figure 1 as well as Figure 2 As shown, the VOC adsorption rotor 10 is provided with an adsorption zone Z1, a desorption zone Z2, and a cooling zone Z3 along the rotation direction. The range of the adsorption zone Z1 in the rotation direction is, for example, a range of 230° to 270°, the range of the desorption zone Z2 is, for example, a range of 30° to 60°, and the range of the cooling zone Z3 is, for example, a range of 30° to 60°.

[0030] The adsorption zone Z1 is a zone for passing the treatment target gas to adsorb the VOC contained in the treatment target gas. The desorption zone Z2 is a zone for desorbing the VOC adsorbed in the adsorption zone Z1. In order to desorb the VOC, the heated gas is passed through the desorption zone Z2. The cooling zone Z3 is a zone for cooling the honeycomb structure 1 heated in the desorption zone Z2. The gas for cooling the honeycomb structure 1 is passed through the cooling zone Z3.

[0031] The gas from which VOC is removed by passing through the adsorption zone Z1 may be returned to the exhaust source of the treatment target gas. The gas warmed by passing through the cooling zone Z3 may be used as the gas passing through the desorption zone Z2.

[0032] exist Figure 2 In the embodiment, if the VOC adsorption rotor 10 rotates counterclockwise, the cells 2 in the adsorption zone Z1 move to the desorption zone Z2 and the cooling zone Z3 in sequence, and then return to the adsorption zone Z1. The honeycomb structure 1 is cooled in the cooling zone Z3, so that VOC can be adsorbed again in the adsorption zone Z1.

[0033] That is, the VOC adsorption rotor 10 rotates, thereby repeatedly adsorbing and desorbing the VOC contained in the treatment target gas. In addition, when the honeycomb structure 1 carries a catalyst for decomposing VOC, in the desorption zone Z2, although the decomposition reaction of VOC is carried out, the adsorbed VOC can be captured and desorbed due to the decomposition of VOC, so it is assumed that the decomposition of VOC is included in the desorption of VOC. The rotation speed of the VOC adsorption rotor 10 is, for example, 8.4 rph or more and 11.0 rph or less.

[0034] As described above, the honeycomb structure 1 contains metal and can be electrified. Therefore, in the separation zone Z2, electric current is passed through the honeycomb structure 1 to generate Joule heat, thereby directly heating the honeycomb structure 1. For example, Figure 3 As shown, a pair of electrodes 20a and 20b in contact with the VOC adsorption rotor 10 are arranged on both outer sides of the VOC adsorption rotor 10 in the rotation axis direction in the desorption zone Z2. When the VOC adsorption rotor 10 rotates, the VOC adsorption rotor 10 rotates while rubbing against the pair of electrodes 20a and 20b while maintaining the contact state. In this state, a voltage is applied between the pair of electrodes 20a and 20b, thereby allowing current to flow through the honeycomb structure 1. As a result, in the desorption zone Z2, the honeycomb structure 1 can be directly heated.

[0035] As described above, the VOC adsorption rotor 10 in the present embodiment allows electric current to flow through the honeycomb structure 1 in the desorption zone Z2, thereby being able to directly heat the honeycomb structure 1, and thus being able to reduce the amount of energy required to desorb VOC. That is, compared with the conventional VOC adsorption rotor that simply desorbs VOC adsorbed on the honeycomb structure 1 by passing the heated gas through the desorption zone Z2, the heating efficiency is good, and the adsorbed VOC can be desorbed with high energy efficiency. For example, in order to desorb VOC adsorbed in the adsorption zone Z1, the heating temperature of the gas passing through the desorption zone Z2 can be lowered compared with the conventional VOC adsorption rotor described above.

[0036] Here, the shape of the cells 2 constituting the honeycomb structure 1 was changed, and the electrical conductivity of the honeycomb structure 1 was investigated by simulation. Here, as honeycomb structures 1 with different shapes of the cells 2, Figure 4 The first fine shape reproduction model 21 shown in (a), and Figure 5 In addition, a first uniform equivalent physical property model 22 ( Figure 4 (b)), and the second uniform equivalent physical property model 24 corresponding to the second fine shape reproduction model 23 ( Figure 5 (b)).

[0037] Figure 4 The first uniform equivalent physical property model 22 shown in (b) and Figure 5 The X-axis direction, the Y-axis direction, and the Z-axis direction of the second uniform equivalent physical property model 24 shown in (b) correspond to the circumferential direction, the radial direction, and the rotation axis direction of the VOC adsorption rotor 10 , respectively.

[0038] Figure 4 The cell 2 in the first fine shape reproduction model 21 shown in (a) has a circumferential dimension La of 3.3 mm, a radial dimension Lb of 2.0 mm, a rotation axis dimension Ld (not shown) of 0.05 mm, and a conductivity σ of 1 / (142×10 8 ) S / m, the resistances in the X-axis direction, the Y-axis direction, and the Z-axis direction of the first fine shape reproduction model 21 and the first uniform equivalent property model 22 when the dimension of the Z-axis direction of the first uniform equivalent property model 22 is set to 0.1 mm are shown in Table 1.

[0039] [Table 1]

[0040]

[0041] As shown in Table 1, the resistance in the X-axis direction of the first uniform equivalent physical property model 22 has an error of 10% or less relative to the resistance in the X-axis direction of the first fine shape reproducing model 21. Similarly, the resistance in the Y-axis direction and the resistance in the Z-axis direction of the first uniform equivalent physical property model 22 have an error of 10% or less relative to the resistance in the Y-axis direction and the resistance in the Z-axis direction of the first fine shape reproducing model 21. Therefore, when performing simulation, the first uniform equivalent physical property model 22 can be used as a simplified model instead of the first fine shape reproducing model 21.

[0042] Figure 5 The second fine shape reproduction model 23 shown in (a) has a cell 2 with a circumferential dimension La of 1.0 mm, a radial dimension Lb of 10.0 mm, a rotation axis dimension Ld (not shown) of 0.05 mm, and a conductivity σ of 1 / (142×10 8 ) S / m, the resistances in the X-axis direction, Y-axis direction and Z-axis direction of the second fine shape reproduction model 23 and the second uniform equivalent property model 24 when the dimension of the Z-axis direction of the second uniform equivalent property model 24 is set to 0.1 mm are shown in Table 2.

[0043] [Table 2]

[0044]

[0045] As shown in Table 2, the resistance in the X-axis direction of the second uniform equivalent physical property model 24 has an error of 10% or less relative to the resistance in the X-axis direction of the second fine shape reproducing model 23. Similarly, the resistance in the Y-axis direction and the resistance in the Z-axis direction of the second uniform equivalent physical property model 24 have an error of 10% or less relative to the resistance in the Y-axis direction and the resistance in the Z-axis direction of the second fine shape reproducing model 23. Therefore, when performing simulation, the second uniform equivalent physical property model 24 can be used as a simplified model instead of the second fine shape reproducing model 23.

[0046] In the first uniform equivalent physical property model 22 and the second uniform equivalent physical property model 24 , the electrical conductivity in the X-axis direction, the electrical conductivity in the Y-axis direction, and the electrical conductivity in the Z-axis direction are expressed by the following equations (1) to (3).

[0047]

[0048]

[0049]

[0050] In addition, the electrical conductivity in the Y-axis direction can also be expressed by the following formula (4).

[0051]

[0052] When the conductivity in the X-axis direction and the conductivity in the Y-axis direction are normalized by setting the conductivity in the Z-axis direction to 1, the normalized conductivity in the X-axis direction and the normalized conductivity in the Y-axis direction each depend only on (2Lb / La).

[0053] Figure 6 (a) is a graph showing the normalized electrical conductivity in the X-axis direction and the normalized electrical conductivity in the Y-axis direction with respect to (2Lb / La). Figure 6 (b) is to Figure 6 The vertical axis of the graph shown in (a) is a logarithmic axis. Figure 6 In (a) and (b), the horizontal axis is a logarithmic axis. Figure 6 In (a) and (b), the conductivity recorded as "X-axis direction" is the normalized conductivity in the X-axis direction, the conductivity recorded as "Y-axis direction" is the normalized conductivity in the Y-axis direction, and the conductivity recorded as "Z-axis direction" is the normalized conductivity in the Z-axis direction.

[0054] like Figure 6 As shown in (a) and (b), the conductivity in the X-axis direction and the conductivity in the Y-axis direction are lower than the conductivity in the Z-axis direction. In addition, the conductivity in the X-axis direction and the conductivity in the Y-axis direction are in a trade-off relationship. If one conductivity is reduced, the other conductivity increases.

[0055] like Figure 3 As shown, when a voltage is applied to the VOC adsorption rotor 10 in the separation zone Z2, the radial heating value of the VOC adsorption rotor 10 can be adjusted by adjusting the size of a pair of electrodes 20a, 20b. That is, by using a pair of electrodes 20a, 20b that are long in the radial direction, the radial heating value can be increased. Therefore, when a voltage is applied to the VOC adsorption rotor 10, if the heating value in the circumferential direction of the VOC adsorption rotor 10, which is the rotation direction, is large, the adsorbed VOC can be effectively separated in the separation zone Z2. In order to increase the circumferential heating value of the VOC adsorption rotor 10, it is sufficient to reduce the electrical conductivity in the circumferential direction (X-axis direction). To this end, as shown in FIG. Figure 6 As shown in (a) and (b), it is sufficient to increase (2Lb / La). If (2Lb / La) is 4 or more, the conductivity in the X-axis direction corresponding to the circumferential direction is smaller than the conductivity in the Y-axis direction corresponding to the radial direction, so (2Lb / La) is preferably 4 or more, that is, Lb / La is preferably 2 or more. In addition, when (2Lb / La) is 6 or more, the conductivity in the X-axis direction corresponding to the circumferential direction becomes smaller, so Lb / La is more preferably 3 or more.

[0056] Figure 7 It shows that the simulation results show that Figure 3 The figures show the results of the temperature distribution of the honeycomb structure 1 when a voltage is applied to a pair of electrodes 20a and 20b in contact with the VOC adsorption rotor 10 as shown, wherein (a) shows the temperature distribution when the first uniform equivalent property model 22 is used, and (b) shows the temperature distribution when the second uniform equivalent property model 24 is used.

[0057] Here, if Figure 7 As shown in (c), four blocks 25 using the first uniform equivalent property model 22 or the second uniform equivalent property model 24 are stacked in an up-down, left-right arrangement, and the temperature distribution of the four blocks 25 when a voltage is applied to a pair of electrodes 26a and 26b arranged at opposing positions in the Z-axis direction is investigated. Figure 7 (a) and Figure 7 The block 25 shown in (b) represents Figure 7 The block 25 located at the lower right among the four blocks 25 shown in (c). Figure 7 In the temperature distribution shown in (a) and (b), the darker the area, the higher the temperature. That is, the temperature of the black area is higher than that of the white area.

[0058] like Figure 7 As shown in (a) and (b), when the second uniform equivalent property model 24 is used, the high temperature region is expanded to a wider range compared to the case where the first uniform equivalent property model 22 is used, and the temperature in the X-axis direction corresponding to the circumferential direction is high over the wide range. That is, in order to more effectively desorb the adsorbed VOC, compared to the first fine shape reproduction model 21 ( Figure 4 (a)), more preferably the second fine shape reproduction model 23 ( Figure 5 (a)).

[0059] The above simulation is a simulation in which the shape of the small chamber 2 is triangular when observed in the extension direction of the rotating shaft 11, but the same is true for the case where the shape of the small chamber 2 is hexagonal or rectangular. Preferably, Lb / La is greater than 2, and more preferably, Lb / La is greater than 3.

[0060] The present invention is not limited to the above-described embodiment, and various applications and modifications can be made within the scope of the present invention.

[0061] The VOC adsorption rotor in the present application is as follows.

[0062] <1> A VOC adsorption rotor having a honeycomb structure carrying an adsorbent for adsorbing VOC, characterized in that:

[0063] The honeycomb structure includes metal.

[0064] <2> .according to <1> The VOC adsorption rotor described is characterized in that, when the dimension of the cells constituting the honeycomb structure in the circumferential direction is La and the dimension in the radial direction is Lb, Lb / La is 2 or more.

[0065] <3> .according to <1> The VOC adsorption rotor described is characterized in that, when the dimension of the cells constituting the honeycomb structure in the circumferential direction is La and the dimension in the radial direction is Lb, Lb / La is 3 or more.

[0066] <4> .according to <2> or <3> The VOC adsorption rotor described above is characterized in that the cell has a triangular shape when viewed in the extending direction of the rotation axis of the VOC adsorption rotor.

[0067] <5> .according to <1> ~ <4> The VOC adsorption rotor described in any one of the above is characterized in that the metal is stainless steel.

[0068] Description of Reference Numerals

[0069] 1: Honeycomb structure;

[0070] 2: Small room;

[0071] 10: VOC adsorption rotor;

[0072] 11: Rotation axis;

[0073] 20a, 20b: a pair of electrodes;

[0074] 21: 1st micro-shape reproduction model;

[0075] 22: The first uniform equivalent property model;

[0076] 23: The second micro-shape reproduction model;

[0077] 24: The second uniform equivalent property model;

[0078] 25: block;

[0079] 26a, 26b: a pair of electrodes;

[0080] Z1: adsorption zone;

[0081] Z2: Detachment zone;

[0082] Z3: Cooling zone.

Claims

1. A VOC adsorption rotor comprising a honeycomb structure carrying an adsorbent for adsorbing VOC, characterized in that: The honeycomb structure includes metal.

2. The VOC adsorption rotor according to claim 1, characterized in that: When the size of the cells constituting the honeycomb structure in the circumferential direction is La and the size in the radial direction is Lb, Lb / La is 2 or more.

3. The VOC adsorption rotor according to claim 1, characterized in that: When the size of the cells constituting the honeycomb structure in the circumferential direction is La and the size in the radial direction is Lb, Lb / La is 3 or more.

4. The VOC adsorption rotor according to claim 2 or 3, characterized in that: When viewed in the extending direction of the rotation axis of the VOC adsorption rotor, the cell has a triangular shape.

5. The VOC adsorption rotor according to any one of claims 1 to 4, characterized in that: The metal is stainless steel.

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