JP2008253672A - Volatile organic compound eliminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a VOC (volatile organic compounds) eliminating device, heightening the decomposition and eliminating efficiency of VOC. <P>SOLUTION: This VOC eliminating device includes an adsorption discharge part 20 having an adsorbent 15, a discharge electrode 16 and a high-voltage power supply 17, and configured to adsorb VOC in the air to be treated with the adsorbent 15 and decompose the adsorbed VOC with discharge plasma, wherein a dehumidifying element (a dehumidifier) 21 is provided on the upstream of the adsorption discharge part 20. The device can obtain an effect of dehumidifying the air A1 to be treated by the dehumidifying element 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a VOC removal apparatus that removes VOCs (Volatile Organic Compounds: mainly volatile organic compounds such as formaldehyde, toluene, xylene, and styrene) that are regulated as indoor air pollutants or air pollutants.

  In recent years, contamination of indoor air has become a problem as heat insulation and airtightness of living spaces progress in order to enhance the cooling and heating effect. Gaseous pollutants include odorous gases and harmful gases. The former is uncomfortable, but the latter causes sick house syndrome, which is a big social problem. VOC is mentioned as a causative substance of sick house syndrome. VOC includes formaldehyde, acetaldehyde, toluene, xylene, ethylbenzene, styrene and the like, and the main causative substance of sick house syndrome is said to be formaldehyde. The Ministry of Land, Infrastructure, Transport and Tourism took the above-mentioned sick house syndrome as a major social problem and enforced the revised Building Standards Law, which obliged to restrict the use of building materials that generate formaldehyde and provide 24-hour ventilation in highly airtight houses.

  On the other hand, VOC (mainly toluene, xylene, and styrene) discharged from the factory to the atmosphere is a cause of air pollution as well as car exhaust gas, and is a serious social problem. The Ministry of Land, Infrastructure, Transport and Tourism also considers VOCs in factory exhaust to be subject to emission regulations in the future.

  2. Description of the Related Art Conventionally, a VOC removal apparatus that uses an adsorbent (adsorbent) in the form of particles, pellets, honeycombs, and discharge plasma generated by high-pressure discharge removes VOC from air to be treated as follows. That is, VOC is adsorbed and collected by the adsorbent by aeration or contact of the air to be treated containing VOC with the adsorbent. Then, discharge plasma is generated continuously or intermittently, and the VOCs adsorbed and collected by the adsorbent are decomposed and removed by the active species generated at that time (see, for example, Patent Documents 1 and 2).

JP 2004-181377 A JP 2002-18231 A

  Among the adsorbents used in the above system, there are hydrophobic adsorbents that are not easily affected by moisture in the atmosphere and hydrophilic adsorbents that are easily affected by moisture. Hydrophilic adsorbents are suitable for the above method because they have a high electrical conductivity and are prone to discharge. However, when moisture is absorbed, that is, when moisture is adsorbed, this moisture becomes a poisonous substance and has a VOC adsorption capacity. descend. On the other hand, when a hydrophobic adsorbent is used, the adsorbent itself is not affected by moisture, but the adsorption capacity of the VOC is reduced by adsorbing moisture to the materials accompanying the adsorbent such as the base material and binder. To do. That is, even if the adsorbent is hydrophilic or hydrophobic, the adsorption capacity of VOC is lowered due to the influence of moisture.

  When the VOC removal apparatus is used in a general atmospheric environment or a general working environment in a building where human activity is active, water to be treated usually contains water vapor. As an example, an environment in which a human can spend comfortably indoors is set to a room temperature of 17 to 28 ° C. and a relative humidity of 40 to 70% in the “Law for Ensuring Hygienic Environment in Buildings”. In other expressions, the moisture concentration is about 7600 to 26000 ppm, and it can be seen that a large amount of moisture is contained in the air.

  And the decomposition | disassembly of VOC by discharge plasma becomes so efficient that the concentration in an adsorbent is high. However, conventionally, when the amount of moisture adsorbed on the adsorbent increases, the amount of VOC adsorbed relatively decreases as described above, so that the concentration of VOC in the adsorbent decreases, and as a result, the decomposition efficiency increases. There was a problem of decline. In addition, as the amount of moisture adsorbed on the adsorbent increases, the resistance component of the adsorbent increases, so the proportion of reactive power in the electric power at the time of discharge plasma generation increases and excessive power is required. It has occurred.

  In addition, regarding the decomposition of VOC using discharge plasma, there has been a proposal to perform humidity control conventionally (for example, Patent Document 2). However, in this humidity control, when the discharge plasma is generated continuously instead of intermittently, the temperature of the adsorbent rises, moisture adsorption to the adsorbent is less likely to occur, and the air to be treated is kept relatively high and constant. This is done as a countermeasure against the fact that active species are not generated by the discharge plasma unless the water concentration is adjusted to the water content (about 15000 to 26000 ppm). In the case of always generating discharge plasma as in this example, the action of decomposing VOC will always occur, but the concentration of VOC in the adsorbent cannot be increased, so the decomposition efficiency is low, and as a result VOC Excessive power will be required for disassembly.

  As described above, conventionally, when the adsorbent absorbs moisture, the saturated adsorption amount of the VOC to be collected is reduced, so that the concentration rate in the adsorbent is reduced. As a result, the decomposition efficiency of VOC by the discharge plasma was lowered. Further, when the adsorbent absorbs moisture, the electric resistance value of the adsorbent increases, so that a large amount of reactive power is generated when a voltage is applied when the discharge plasma is generated. As a result, excessive power is required when the VOC adsorbed on the adsorbent is decomposed by the discharge plasma.

  The present invention has been made to solve the above-described problem. Before the VOC of the air to be treated is adsorbed by the adsorbent, the air to be treated is dehumidified by a dehumidifying device, thereby increasing the efficiency of decomposition and removal of the VOC. An object of the present invention is to provide a VOC removal device.

  In order to solve the above-described problems and achieve the object, the VOC removal device of the present invention includes a casing in which an air passage is formed between an inlet and an outlet, and an inlet provided on the air passage in the casing. A blower that moves the air to be treated sucked from the outlet to the discharge port, and an adsorbent, a discharge electrode, and a high-voltage power supply that are provided on the air path, and adsorb the VOC in the air to be treated with the adsorbent. An adsorption discharge unit that decomposes the VOCs with discharge plasma and a dehumidifying device that is provided upstream of the adsorption discharge unit in the air path and that reduces moisture contained in the air to be treated are provided.

  According to the VOC removal apparatus of the present invention, the adsorption discharge unit having the adsorbent, the discharge electrode, and the high voltage power source is provided, and the dehumidifying device is provided upstream of the adsorption discharge unit. Since the processing air is dehumidified, the moisture content of the air to be processed is reduced. As a result, the amount of moisture adsorbed on the adsorbent decreases and the amount of VOC adsorbed relatively increases. As a result, the concentration ratio of the VOC removed by the adsorbent can be improved, the reactive power during discharge is reduced, and the VOC decomposition and removal efficiency is greatly improved.

  Embodiments of a VOC removal apparatus according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing a functional configuration of a first embodiment of a VOC removal apparatus according to the present invention. In FIG. 1, the VOC removal device has a casing (not shown) in which an air suction port, an air discharge port, and an air passage through which air is circulated are formed between the suction port and the discharge port. The white arrow in the figure shows the state of the air flowing in this air passage. Arrows A1 to A3 indicate the flow of the air to be processed that flows through the first air passage (not shown). Arrows B1 to B3 indicate the air flow for element regeneration flowing through the second air passage (not shown).

  The VOC removing device has a blower 11 for blowing air to be processed downstream of the first air passage. The blower 11 allows the air to be treated A1 sucked from the suction port to pass through various devices provided in the first air passage, moves to the discharge port, and discharges it as air to be treated (exhaust heat air) A3. .

  The VOC removal device also has an adsorption discharge unit 20 provided upstream from the blower 11 in the first air path. The adsorption discharge unit 20 includes an adsorbent 15, a discharge electrode 16, and a high voltage power supply 17. The adsorption discharge unit 20 performs the following operation. That is, first, the air to be treated A2 containing VOC is passed through the adsorbent 15 to perform adsorption concentration. That is, the VOC in the air to be treated is adsorbed by the adsorbent 15. Thereafter, the VOC adsorbed on the adsorbent 15 is decomposed by the discharge plasma generated from the discharge electrode 16. The adsorbent 15 is provided with a ground power supply line 18 for grounding.

  The VOC removing device further includes a rotary dehumidifying element (dehumidifying device) 21 provided further upstream than the adsorption discharge unit 20 of the first air path. The dehumidifying element 21 is made of a highly hydrophilic hygroscopic material such as zeolite or silica, has a substantially disk shape, and rotates around an axis as indicated by an arrow C. And the to-be-processed air A1 suck | inhaled from the suction inlet is ventilated to the one side protruded in the 1st air path. Thereby, moisture to be treated air A1 is absorbed and moisture contained in treated air A1 is reduced.

  The adsorbent 15 is not limited as long as it has electrical conductivity, but the adsorbent is made of metal such as nickel, copper, silver, gold, platinum, palladium, and copper oxide, zinc oxide, titanium dioxide, oxide. By attaching and supporting a substance having a catalytic action such as a metal oxide such as manganese, the decomposition and removal performance of VOC can be improved. By making the adsorbent 15 into a granular shape, a pellet shape, a honeycomb shape, or the like, the surface area can be increased and the decomposition efficiency of VOC can be improved.

  The adsorbent 15 continuously aerates the dehumidified air to be treated A2 and continuously adsorbs and concentrates the VOC contained therein. Then, the high voltage power source 17 is operated to generate discharge plasma from the discharge electrode 16 at the timing when the adsorption performance of the chemical substance of the adsorbent 15 is saturated or when the adsorption is performed for a certain time. By virtue of the active species such as oxygen atoms generated by generating this discharge plasma, the VOC concentrated and adsorbed in the adsorbent 15 is decomposed and removed for purification.

  The VOC removal apparatus also includes a dehumidifying element regeneration blower 31 provided downstream of the second air passage and a regeneration heater 33 of the dehumidifying element 21 provided upstream of the dehumidification element regeneration blower 31. Have. The dehumidifying element regeneration blower 31 supplies the dehumidifying element 21 as heated air (dehumidifying element regenerating air) by heating the regenerating air B1 sucked from the suction port (not shown) through the regenerating heater 33. To do. The air that has passed through the dehumidifying element 21 and regenerated the dehumidifying performance of the dehumidifying element 21 is then discharged from the discharge port (not shown) as exhaust air B3. The heater 33 for regeneration and the blower 31 for regeneration of the dehumidifying element constitute heating regeneration means for regenerating the dehumidifying performance of the dehumidifying element 21 by heating the dehumidifying element 21.

  The air to be treated A1 is dehumidified by passing through the dehumidifying element 21 until the water concentration becomes 6000 ppm or less. As the material of the dehumidifying element 21, zeolite or silica is suitable as described above, but is not limited thereto, and any material having dehumidifying performance can be used.

  As described above, the dehumidifying element 21 is a rotary dehumidifying element that is always rotating as indicated by an arrow C. The dehumidifying element 21 absorbs moisture in the first air path and rotates the portion containing moisture to the second air path side, and is dehumidified element regenerated air (heated air) B2 heated by the regenerating heater 33. Dehumidification performance is regenerated by supplying Thus, the rotary dehumidifying element 21 continuously absorbs moisture and regenerates while rotating, so that the air to be treated A1 can be dehumidified continuously.

  As described above, the VOC removal apparatus according to the present embodiment includes the adsorbent 15, the discharge electrode 16, and the high-voltage power source 17, and adsorbs the VOC in the air to be treated with the adsorbent 15, and the adsorbed VOC. Since it has the adsorption discharge part 20 decomposed by the discharge plasma and the dehumidifying element (dehumidifying device) 21 is provided upstream of the adsorption discharge part 20, the air to be treated A1 is dehumidified by the dehumidifying element 21. The moisture content of the air to be treated A2 is reduced. As a result, the amount of moisture adsorbed on the adsorbent 15 decreases, and the amount of VOC adsorbed on the adsorbent 15 relatively increases. As a result, the concentration rate of the VOC removed by the adsorbent 15 can be improved, the reactive power during discharge is reduced, and the VOC decomposition and removal efficiency is greatly improved.

The VOC removal apparatus according to the present embodiment has a heating regeneration unit that regenerates the dehumidifying performance by heating the dehumidifying element 21. The heating regeneration unit includes the regeneration heater 33 and the regeneration heater. Since the dehumidifying element regeneration air blower 31 for supplying the dehumidifying element regeneration air (heated air) B2 heated at 33 to the dehumidifying element 21 is provided, the dehumidifying element 21 can be efficiently regenerated.

  Here, the result of having verified about the chemical substance concentration improvement effect at the time of using together with a dehumidifier like this Embodiment is described. FIG. 2 shows the change in chemical substance concentration due to the moisture concentration in the air to be treated when the air to be treated having a chemical substance concentration of 50 ppm is continuously passed through a manganese-based adsorbent having a thickness of 30 mm at a linear wind speed of 0.5 m / s. . When the air to be treated containing chemical substances passes through the adsorbent, the chemical substance concentration in the air to be treated immediately after the adsorption of the adsorbent decreases, but gradually increases over time. Became.

  Here, when the difference in moisture concentration contained in the air to be treated is examined, when the moisture concentration in the air to be treated is low (300 ppm of water), the time until the outlet concentration becomes equal to the inlet concentration is about 80 minutes. On the other hand, when the moisture concentration in the air to be treated is high (water 6000 ppm), the time until the outlet concentration becomes equal to the inlet concentration is about 50 minutes, which varies greatly depending on the moisture concentration in the air to be treated. . Furthermore, it was confirmed that the total amount of chemical substances adsorbed on the adsorbent tends to decrease as the moisture concentration in the air to be treated increases.

  In addition, the result of verifying the content that the improvement of chemical substance concentration improves the decomposition efficiency of chemical substances will be described. When the conductive honeycomb adsorbent is a ground electrode and the discharge electrode is disposed at the opposite position, the molar amount of the chemical substance adsorbed on the conductive honeycomb adsorbent when the water concentration is low (300 ppm of water) is 1. The decomposition efficiency of chemical substances was compared using conductive honeycomb adsorbents having different concentrations and adsorbing chemical substances with molar amounts of 3.2 times and 4.9 times.

  Discharge energy (decomposition) required for decomposing the chemical substance 1g by applying a voltage between the ground electrode made of the conductive honeycomb adsorbent and the discharge electrode and measuring the decomposition product of the chemical substance (Efficiency) was evaluated. The result is shown in FIG. The horizontal axis represents the ratio of the number of moles of chemical substances adsorbed on the conductive honeycomb adsorbent, the vertical axis represents the energy (decomposition efficiency) [Wh / g] required to decompose 1 g of the chemical substance, and the second vertical axis. Shows the molar ratio of chemical substances to be desorbed at the time of discharge based on the result in the presence of a water concentration of 300 ppm.

  As shown in FIG. 3, the higher the chemical substance concentration of the conductive honeycomb adsorbent, the higher the chemical substance decomposition efficiency. That is, it was confirmed that the power consumption can be reduced because the discharge energy required to decompose 1 g of the chemical substance can be suppressed.

  Furthermore, the result of having verified about reduction of the reactive power at the time of using a dehumidifier together is described. Using an adsorption discharge section in which a conductive honeycomb adsorbent is a ground electrode and a discharge electrode is arranged at the opposite position, the moisture concentration contained in the air to be treated during chemical substance adsorption is 300, 6000, and 13000 [ppm]. In this case, the decomposition efficiency of the chemical substance when the discharge treatment was performed on the conductive honeycomb adsorbent in which an equal amount of the chemical substance was adsorbed was compared. During the discharge decomposition, the decomposition operation was performed while ventilating air containing a water concentration of 300 ppm.

  Discharge energy (decomposition) required for decomposing the chemical substance 1g by applying a voltage between the ground electrode made of the conductive honeycomb adsorbent and the discharge electrode and measuring the decomposition product of the chemical substance (Efficiency) was evaluated. The result is shown in FIG. The horizontal axis indicates the water concentration [ppm] contained in the air to be treated at the time of chemical substance adsorption, and the vertical axis indicates the energy (decomposition efficiency) [Wh / g] required to decompose 1 g of the chemical substance.

  As shown in FIG. 4, even when the discharge treatment is performed with the same adsorption amount and input power, if the moisture concentration of the air to be treated increases, the chemical substance that is desorbed without being decomposed increases, so the decomposition efficiency of the chemical substance increases. It was confirmed that it decreased. That is, the amount of desorption of the chemical substance increases simultaneously with the desorption of moisture due to the temperature rise at the time of discharge, and the energy required for decomposing the chemical substance 1g increases, so the required high-voltage power supply capacity increases.

  When the air to be treated containing moisture passes through the conductive honeycomb adsorbent, water molecules are adsorbed on the pores of the adsorbent. When discharge plasma is generated for the conductive honeycomb adsorbent, electric power is consumed in addition to discharge. That is, the resistance component of the adsorbent increases due to moisture adsorption, and the reactive power consumption with respect to the input power increases. When the reactive power consumption increases, the generation efficiency of active species such as oxygen atoms with respect to the input power, the reaction rate with the chemical substance adsorbed on the conductive honeycomb adsorbent, and the chemical substance decomposition efficiency decrease.

  On the other hand, as in the present embodiment, a dehumidifying device is provided at the front part of the discharge unit to suppress moisture adsorption to the conductive honeycomb adsorbent, thereby desorbing chemical substances from the adsorbent during discharge. In addition to suppressing the amount, the resistance component of the adsorbent can be reduced and the power loss can be suppressed, so that the chemical substance can be decomposed and removed with high efficiency and low power. With these effects, a VOC removal device with higher decomposition efficiency can be provided.

Embodiment 2. FIG.
FIG. 5 is a schematic diagram showing a functional configuration of the second embodiment of the VOC removal apparatus according to the present invention. In the present embodiment, the exhausted hot air A3 of the discharge plasma is used for regeneration of the dehumidifying performance of the dehumidifying element 21. For this reason, the heating regeneration means uses an induction air path (not shown) for guiding the exhaust plasma exhaust heat air A3 to the dehumidifying element 21 while bypassing it as regeneration air B1, and exhaust heat air via the induction air path. A blower for supplying A3 to the dehumidifying element 21 (also used as the blower 11 for blowing the air to be treated). Other configurations are the same as those of the first embodiment.

  When the high-voltage power supply 17 is operated to generate discharge plasma from the discharge electrode 16 and decompose the VOC that is concentrated and adsorbed on the adsorbent 15, the temperature of the adsorbent 15 rises due to the energy of discharge. For this reason, the exhaust heat air A3 after adsorbing and cleaning that has passed through the adsorbent 15 is heated and the temperature rises. And the dehumidifying element 21 is heated and the dehumidifying performance is regenerated by introducing the heated exhaust heat air A3 after the adsorption cleaning to the dehumidifying element 21. By performing this process continuously while rotating the dehumidifying element 21, the air to be treated A1 can be dehumidified continuously. The operation of concentration adsorption and discharge decomposition in the adsorption discharge unit 20 after dehumidifying the air to be treated A1 is the same as that in the first embodiment, and thus the description thereof is omitted.

  As described above, in the VOC removal apparatus according to the present embodiment, the heating and regenerating means is provided in the induction air passage that guides the exhaust heat air of the discharge plasma to the dehumidification element, and the exhaust air is supplied to the dehumidification element. 21 is used as a blower 11 for supplying air to be treated (also used as the blower 11 for blowing the air to be treated), so that a heater for the purpose of regenerating the dehumidifying element 21 is not required, so that the air to be treated A1 has less power consumption It is possible to provide a VOC removal apparatus that performs cleaning with the above.

Embodiment 3 FIG.
FIG. 6 is a schematic diagram showing a functional configuration of the VOC removal apparatus according to the third embodiment of the present invention. In the present embodiment, a heat exchanger 34 is provided upstream of the adsorption discharge unit 20 in place of the dehumidifying element 21 of the first embodiment. A heat pump device 35 is connected to the heat exchanger 34 via a refrigerant pipe 36. The heat pump device 35 supplies the cooled refrigerant to the heat exchanger 34. Other configurations are the same as those of the first embodiment.

  The operation will be described. The heat pump device 35 is operated to circulate the cooled refrigerant to the heat exchanger 34. And the heat exchanger 34 supplied with the cooled refrigerant is cooled below the dew point of the air to be treated A1. Thereby, the to-be-processed air A1 that has passed through the heat exchanger 34 is cooled below the dew point by heat transfer, and dew condensation occurs when passing through the heat exchanger 34. As a result, the air to be treated A1 is dehumidified. Note that the operation of concentration adsorption and discharge decomposition in the adsorption discharge unit 20 after dehumidifying the air to be treated A1 is the same as that in the first embodiment, and thus the description thereof is omitted.

  As described above, in the VOC removal device of the present embodiment, the dehumidifying device heat exchanger 34 that exchanges heat with the air to be treated A1, and the heat pump device 35 that supplies the cooled refrigerant to the heat exchanger 34. Therefore, the dehumidifying element 21 that needs to regenerate the moisture adsorption performance is not required, so that a highly efficient VOC removing device in which the required volume of the dehumidifying device portion is reduced can be provided.

Embodiment 4 FIG.
FIG. 7 is a schematic diagram showing a functional configuration of the fourth embodiment of the VOC removal apparatus according to the present invention. In the present embodiment, first, a dehumidifying element 21 made of a hygroscopic material such as zeolite or silica similar to that of the first embodiment is provided upstream of the adsorption discharge unit 20. A heat exchanger 34 is provided further upstream of the dehumidifying element 21. A heat pump device 35 is connected to the heat exchanger 34 via a refrigerant pipe 36. The heat pump device 35 supplies the cooled refrigerant to the heat exchanger 34. In the present embodiment, the exhaust heat air from the heat pump device 35 is used for the regeneration of the dehumidifying function of the dehumidifying element 21. Other configurations are the same as those of the first embodiment.

  The operation will be described. The heat pump device 35 is operated to circulate the cooled refrigerant to the heat exchanger 34. And the heat exchanger 34 supplied with the cooled refrigerant is cooled below the dew point of the air to be treated A1. Thereby, the to-be-processed air A1 that has passed through the heat exchanger 34 is cooled below the dew point by heat transfer, and dew condensation occurs when passing through the heat exchanger 34. As a result, the air to be treated A1 is dehumidified.

  The air to be treated A1 dehumidified by the heat exchanger 34 is then passed through the dehumidifying element 21. The air to be treated A1 has been dehumidified by a predetermined amount by passing through the heat exchanger 34, and further residual moisture can be removed by ventilating the dehumidifying element 21. As a result, the air to be treated A1 is dehumidified to a state further lower than the dew point of 0 ° C.

  The heat pump device 35 that operates to cool the heat exchanger 34 discharges exhaust heat air having a relatively high temperature with respect to the cooled refrigerant sent to the heat exchanger 34. Therefore, the dehumidifying performance of the dehumidifying element 21 can be regenerated by guiding this exhausted air to the dehumidifying element 21 and heating the dehumidifying element 21. Since the operation of concentration adsorption and discharge decomposition in the adsorption discharge unit 20 after dehumidifying the air to be treated A1 is the same as that of the first embodiment, the description thereof is omitted.

  As described above, in the VOC removal apparatus according to the present embodiment, the dehumidifier is dehumidified by the dehumidifying element 21 that ventilates the air to be treated A1 and dehumidifies the moisture in the air to be treated A1, and upstream of the dehumidifying element 21. Since the heat exchanger 34 that is provided and exchanges heat with the air to be treated A1 and the heat pump device 35 that supplies the cooled refrigerant to the heat exchanger 34 are provided, the VOC removal devices according to the first to third embodiments are provided. Compared to the above, since it is possible to remove more water contained in the air to be treated A1, the concentration of VOC in the adsorbent 15 can be increased, and a heater required for regenerating the dehumidifying element 21 is not required. It becomes. As a result, it is possible to provide an OC removal device capable of obtaining higher VOC decomposition efficiency.

  The present invention is suitably applied to a VOC removal apparatus that removes VOCs that are subject to regulation as indoor air pollutants or air pollutants from the air to be treated.

It is a schematic diagram which shows the function structure of Embodiment 1 of the VOC removal apparatus concerning this invention. It is an adsorption | suction characteristic view of adsorbent by the difference in the moisture concentration contained in to-be-processed air. It is a characteristic figure of the chemical substance concentration of an adsorbent and the decomposition efficiency of a chemical substance. It is a characteristic view of the moisture concentration of to-be-processed air, and the decomposition efficiency of a chemical substance. It is a schematic diagram which shows the function structure of Embodiment 2 of the VOC removal apparatus concerning this invention. It is a schematic diagram which shows the function structure of Embodiment 3 of the VOC removal apparatus concerning this invention. It is a schematic diagram which shows the function structure of Embodiment 4 of the VOC removal apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Blower for to-be-processed air 15 Adsorbent 16 Discharge electrode 17 High voltage power supply 18 Ground power supply line 20 Adsorption discharge part 21 Dehumidification element 31 Dehumidification element reproduction | regeneration fan 33 Regeneration heater 34 Heat exchanger 35 Heat pump apparatus 36 Refrigerant piping

Claims (9)

A casing in which an air passage is formed between the suction port and the discharge port;
A blower for moving the air to be treated, which is provided on the air passage in the casing and sucked from the suction port, to the discharge port;
An adsorption discharge unit provided on the air passage, having an adsorbent, a discharge electrode, and a high-voltage power supply, adsorbing VOC in the air to be treated with the adsorbent, and decomposing the adsorbed VOC with discharge plasma;
A VOC removal device comprising: a dehumidifying device provided upstream of an adsorption discharge portion of the air passage to reduce moisture contained in the air to be treated. The VOC removal apparatus according to claim 1, wherein the dehumidifying apparatus includes a dehumidifying element that ventilates the air to be treated and dehumidifies moisture in the air to be treated. The VOC removal device according to claim 1, wherein the dehumidifying device includes a heat exchanger that exchanges heat with the air to be treated, and a heat pump device that supplies a cooled refrigerant to the heat exchanger. The dehumidifier includes a dehumidifying element that ventilates the air to be treated and dehumidifies moisture in the air to be treated, a heat exchanger that is provided upstream of the dehumidifying element and exchanges heat with the air to be treated, and the heat exchange The VOC removal apparatus according to claim 1, further comprising: a heat pump device that supplies a cooled refrigerant to the vessel. The VOC removing apparatus according to claim 2 or 4, wherein the dehumidifying element is made of zeolite or silica. The VOC removal apparatus according to any one of claims 2, 4, and 5, further comprising a heating regeneration unit that regenerates the dehumidifying performance by heating the dehumidifying element. The VOC removal apparatus according to claim 6, wherein the heating regeneration unit includes a heater and a blower that supplies air heated by the heater to the dehumidifying element. The heating regeneration unit includes an induction air path that guides exhaust heat air of the discharge plasma to a dehumidification element, and a blower that is provided in the induction air path and supplies the exhaust heat air to the dehumidification element. The VOC removal apparatus according to claim 6. The VOC removal apparatus according to any one of claims 1 to 8, wherein the dehumidifying apparatus adjusts the amount of water contained in the air to be treated so that a water concentration is 6000 ppm or less.

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