JP2006242791A - Voc concentration meter and voc removing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a VOC concentration meter for accurately measuring the concentration even when the VOC concentration in indoor air is low, and to provide a VOC removing system for accurately measuring the concentration and exhausting VOC outdoors even when the VOC concentration in indoor air is low. <P>SOLUTION: The VOC concentration meter comprises a reproducible VOC adsorbing means; a blowing means for generating an airstream passing the VOC concentration meter; a reproducing means that is arranged on the upstream side of the VOC adsorbing means with respect to the airstream and reproduces the VOC adsorbing means; and a VOC sensor arranged on the downstream side of the VOC adsorbing means with respect to the airstream. When the reproducing means reproduces the VOC adsorbing means, the VOC sensor measures the concentration of the concentrated VOC exhausted from the VOC adsorbing means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a VOC concentration measuring apparatus and a VOC removal system.

Patent Document 1 discloses a formaldehyde concentration meter that can measure the concentration of formaldehyde, which is a kind of volatile organic compound (hereinafter referred to as VOC), in the air with high accuracy at room temperature. The formaldehyde densitometer of Patent Document 1 is configured to perform concentration measurement based on reaction heat generated when formaldehyde is oxidatively decomposed at room temperature.
JP 2003-240744 A

Even if the densitometer of Patent Document 1 is used, if the formaldehyde concentration in the air is low, the reaction heat generated when the formaldehyde is oxidatively decomposed at room temperature decreases, so that high-precision measurement is difficult. When constructing a VOC removal system that controls the VOC concentration in the indoor air to a specified value or less, when the VOC concentration in the indoor air is low, how to measure the VOC concentration with high accuracy becomes a problem.
The present invention has been made in view of the above problems, and even when the VOC concentration in indoor air is low, the VOC concentration measuring device that measures the concentration with high accuracy, and even when the VOC concentration in indoor air is low, An object of the present invention is to provide a VOC removal system that discharges VOCs outdoors while measuring the concentration with high accuracy.

In order to solve the above problems, in the present invention, a reproducible VOC adsorption means, a blower means for generating an air flow passing through the VOC adsorption means, and a VOC disposed upstream of the VOC adsorption means with respect to the air flow. A regenerating unit for regenerating the adsorbing unit; and a VOC sensor disposed downstream of the VOC adsorbing unit with respect to the air flow. The VOC sensor is connected to the VOC adsorbing unit when the regenerating unit regenerates the VOC adsorbing unit. There is provided a VOC concentration measuring apparatus characterized by measuring a concentration of concentrated VOC released.
If the flow rate of air passing through the VOC adsorption means during the adsorption operation is set to be larger than the flow rate of air passing through the VOC adsorption means during the regeneration operation, the VOC in the air flow flowing downstream of the VOC adsorption means during the regeneration operation is reduced. Further, it is possible to concentrate more than the VOC in the air flow before passing through the VOC adsorption means during the adsorption operation. In the present invention, since the VOC sensor measures the concentrated VOC concentration released from the VOC adsorption unit when the regeneration unit regenerates the VOC adsorption unit, the concentration can be measured with high accuracy. . The VOC concentration in the airflow before passing through the VOC adsorption means during the adsorption operation can be indirectly measured with high accuracy by calculating backward from the VOC concentration measured by the VOC sensor even when the concentration is low. .

In a preferred embodiment of the present invention, the VOC sensor is disposed at a position where the velocity distribution of the air flow that has passed through the VOC adsorption means is uniform.
By arranging the VOC sensor at a position where the velocity distribution of the turbulent air flow passing through the VOC adsorption means is made uniform and the VOC concentration distribution is made uniform, the accuracy of VOC concentration measurement can be improved.

In the present invention, a reproducible VOC adsorbing means, an air blowing means for generating an air flow passing through the VOC adsorbing means, and a regenerating means disposed upstream of the VOC adsorbing means with respect to the air flow and regenerating the VOC adsorbing means. A VOC sensor disposed downstream of the VOC adsorption means with respect to the air flow, a first air guide device for introducing indoor air to the VOC adsorption means during the adsorption operation and returning the indoor air that has passed through the VOC adsorption means to the indoors; A second air guide device for guiding outdoor air or indoor air to the VOC adsorption means that is being regenerated and discharging the outdoor air or indoor air that has passed through the VOC adsorption means to the outside, and the VOC sensor includes the VOC adsorption means. A VOC removal system for measuring the concentration of concentrated VOC released from the VOC adsorption means when regenerating
If the flow rate of air passing through the VOC adsorption means during the adsorption operation is set to be larger than the flow rate of air passing through the VOC adsorption means during the regeneration operation, the VOC in the air flow flowing downstream of the VOC adsorption means during the regeneration operation is reduced. Further, it is possible to concentrate more than the VOC in the air flow before passing through the VOC adsorption means during the adsorption operation. In the present invention, the VOC sensor measures the concentration of the concentrated VOC released from the VOC adsorption unit when the regeneration unit regenerates the VOC adsorption unit, so that the concentration can be measured with high accuracy. it can. The VOC concentration in the airflow before passing through the VOC adsorption means during the adsorption operation can be indirectly measured with high accuracy by calculating backward from the VOC concentration measured by the VOC sensor even when the concentration is low. . Indoor air is introduced into the VOC adsorption means during the adsorption operation and the indoor air that has passed through the VOC adsorption means is returned to the indoors, and outdoor air or indoor air is introduced into the VOC adsorption means that is being reproduced and passed through the VOC adsorption means. Can be removed from the indoor air, and the VOC concentration in the indoor air can be lowered to a specified value or less.
By arranging the VOC sensor at a position where the velocity distribution of the turbulent air flow passing through the VOC adsorption means is made uniform and the VOC concentration distribution is made uniform, the accuracy of VOC concentration measurement can be improved.

In the present invention, the indoor air is caused to flow indoors through the adsorption area of the rotating VOC adsorption rotor that rotates and the VOC adsorption rotor that forms the first area on the front projection of the rotating VOC adsorption rotor. Outdoor air in the regeneration area of the VOC adsorption rotor that forms a remaining area on the front view projection of the first air flow path, the first air blowing means disposed in the first air flow path, and the rotating VOC adsorption rotor Or the 2nd air flow path for flowing indoor air and discharging | emitting outside, the 2nd ventilation means arrange | positioned in the 2nd air flow path, in the 2nd air flow path and in the 2nd air flow path Heating means disposed upstream of the VOC adsorption rotor with respect to the air flow of the VOC, and a VOC sensor disposed downstream of the VOC adsorption rotor in the second air flow path and with respect to the air flow in the second air flow path. And the VOC sensor is the second blower When the VOC adsorption rotor is regenerated by operating the heating means, the concentration of concentrated VOC released from the regeneration region of the VOC adsorption rotor is measured, and a VOC removal system is provided. .
In the VOC removal system according to the present invention, the VOC in the indoor air flowing through the first air flow path is adsorbed by the adsorption area of the rotating VOC adsorption rotor, and the second air flow path is moved from the regeneration area of the rotating VOC adsorption rotor. It is discharged into flowing outdoor air or indoor air and discharged to the outside. The VOC adsorption rotor that has been regenerated by releasing VOC in the regeneration region again adsorbs VOC in the adsorption region. The adsorption and release of VOC by the VOC adsorption rotor are repeated, and the VOC concentration in the indoor air is reduced to a specified value or less.
If the flow rate of the air flow in the first air flow path is set larger than the flow rate of the air flow in the second air flow path, the air flowing through the second air flow path after the VOC in the indoor air is concentrated Released into. Even when the VOC concentration in the indoor air is low, the VOC concentration in the air flowing through the second air flow path downstream from the adsorption rotor is high, so that it can be measured with high accuracy. Therefore, the VOC concentration in the indoor air can be indirectly measured with high accuracy by calculating backward from the measured value, and the VOC concentration in the indoor air can be controlled to a specified value or less.
By arranging the VOC sensor at a position where the velocity distribution of the air flow in the second air flow path is made uniform and the VOC concentration distribution is made uniform, the accuracy of VOC concentration measurement can be improved.
Since the VOC adsorption efficiency of the VOC adsorption rotor is affected by the temperature and humidity of the indoor air flowing through the adsorption region of the VOC adsorption rotor, the VOC concentration in the indoor air is accurately back-calculated from the VOC concentration measured by the VOC sensor. In addition, it is desirable that the first humidity sensor and the first temperature sensor are disposed in the first air flow path to accurately grasp the VOC adsorption efficiency.

In a preferred embodiment of the present invention, the VOC removal system includes a rotating and regenerating moisture adsorption rotor, and the first air flow path forms a first region on a front view projection of the rotating moisture adsorption rotor. Indoor air is allowed to flow between the adsorption area of the VOC adsorption rotor and the adsorption area of the VOC adsorption rotor and from the moisture adsorption rotor to the VOC adsorption rotor, and the second air flow path forms a remaining area on the front view projection of the rotating moisture adsorption rotor. The outdoor air or indoor air is allowed to flow through the regeneration region of the moisture adsorption rotor and the regeneration region of the VOC adsorption rotor and from the moisture adsorption rotor to the VOC adsorption rotor and is discharged to the outdoors.
The VOC adsorption performance of the VOC adsorption area of the VOC adsorption rotor decreases when the humidity of the air passing through the area is high. Therefore, it is desirable to reduce the humidity of the air passing through the adsorption region of the VOC adsorption rotor by arranging the adsorption region of the moisture adsorption rotor upstream of the adsorption region of the VOC adsorption rotor with respect to the air flow flowing through the first air flow path. .

In a preferred aspect of the present invention, the VOC removal system includes a control unit that controls the operation of the first blowing unit and / or the heating unit and / or the second blowing unit based on detection information of the VOC sensor.
By controlling the operation of the first blowing means and / or the heating means and / or the second blowing means based on the detection information of the VOC sensor, it is possible to control the VOC concentration of indoor air while eliminating waste of energy consumption. it can.

In a preferred aspect of the present invention, when the VOC concentration detected by the VOC sensor is equal to or less than a specified value, the control unit outputs the output of the first blowing unit and / or the output of the heating unit and / or the output of the second blowing unit. The first blowing unit and / or the heating unit and / or the second blowing unit are stopped.
If the VOC concentration in the indoor air falls below the specified value, the need to remove the VOC further decreases or disappears, so the output of the first blower means and / or the output of the heating means and / or the output of the second blower means It is desirable to reduce wasteful energy consumption by stopping the first air blowing means and / or the heating means and / or the second air blowing means.

In a preferred aspect of the present invention, the VOC removal system includes a second humidity sensor disposed in the first air flow path and upstream of the moisture adsorption rotor with respect to the air flow in the first air flow path. Controls the operation of the first blowing means and / or the heating means and / or the second blowing means based on the detection information of the second humidity sensor.
When the humidity of the indoor air is within the appropriate range, operating the moisture adsorption rotor will sufficiently reduce the humidity of the indoor air that passes through the adsorption area of the VOC adsorption rotor, so that the VOC adsorption performance of the VOC adsorption rotor is appropriate. Value can be maintained. Therefore, in this case, it is desirable to promote the VOC removal by promoting the operation of the first air blowing means and / or the heating means and / or the second air blowing means. On the other hand, when the humidity of the indoor air is extremely high, even if the moisture adsorption rotor is operated, the humidity of the indoor air passing through the adsorption region of the VOC adsorption rotor cannot be sufficiently reduced. VOC adsorption performance decreases. Therefore, in this case, the VOC removal cannot be promoted even if the first blowing unit and / or the heating unit and / or the second blowing unit are operated. Therefore, when the moisture adsorption rotor is arranged, the second humidity sensor is arranged upstream of the moisture adsorption rotor with respect to the air flow in the first air flow path, and the second humidity sensor is detected based on the detection information of the second humidity sensor. It is desirable to eliminate waste of energy consumption by controlling the operation of the first blowing means and / or the heating means and / or the second blowing means.

In a preferred aspect of the present invention, when the humidity detected by the second humidity sensor exceeds a specified value, the control means outputs the first air blowing means and / or the heating means and / or the second air blowing means. Or the first blowing means and / or the heating means and / or the second blowing means are stopped.
When the humidity of the indoor air is extremely high, even if the moisture adsorption rotor is operated, the humidity of the indoor air passing through the adsorption region of the VOC adsorption rotor cannot be sufficiently reduced, and the VOC adsorption of the VOC adsorption rotor Performance is degraded. In this case, since the VOC removal cannot be promoted even if the operation of the first air blowing means and / or the heating means and / or the second air blowing means is promoted, the output of the first air blowing means and / or the heating means. It is desirable to reduce the output of power and / or the output of the second air blowing means, or stop the first air blowing means and / or the heating means and / or the second air blowing means to eliminate waste of energy consumption.

In a preferred aspect of the present invention, when the humidity detected by the second humidity sensor exceeds a specified value, the control means outputs the first air blowing means and / or the heating means and / or the second air blowing means. If the VOC concentration detected by the VOC sensor is equal to or lower than the specified value and / or the first blowing means and / or the heating means and / or the second blowing means is stopped, and / or the output of the first blowing means and / or The output of the heating means and / or the output of the second air blowing means is reduced, or the first air blowing means and / or the heating means and / or the second air blowing means are stopped.
When the humidity of the indoor air is extremely high, even if the moisture adsorption rotor is operated, the humidity of the indoor air passing through the adsorption region of the VOC adsorption rotor cannot be sufficiently reduced, and the VOC adsorption of the VOC adsorption rotor Considering that the performance deteriorates, when both the control based on the humidity of the indoor air and the control based on the VOC concentration of the indoor air are performed, it is desirable to perform the former with priority over the latter.

In a preferred aspect of the present invention, the VOC removal system includes a second temperature sensor disposed in the second air flow path and downstream of the VOC adsorption rotor with respect to the air flow in the second air flow path. Controls the operation of the heating means and / or the second air blowing means based on the detection information of the VOC sensor and the detection information of the second temperature sensor.
The VOC release performance in the regeneration region of the VOC adsorption rotor depends on the temperature of the air flow flowing through the part. Accordingly, the second temperature sensor is disposed in the second air flow path and downstream of the heating means with respect to the air flow in the second air flow path, and the heating means and / or the It is desirable to control the operation of the second blowing means to optimize the temperature of the air flow flowing through the regeneration region of the VOC adsorption rotor and to optimize the VOC release performance in that region.
If the position where the second temperature sensor is disposed is a position downstream of the VOC adsorption rotor and the velocity distribution of the air flow in the second air flow path is uniform, the temperature distribution of the air flow is also uniform at that position. Therefore, it is considered that the average temperature of the airflow flowing through the regeneration region of the VOC adsorption rotor can be detected.

In the VOC concentration measuring apparatus according to the present invention, the VOC sensor measures the concentrated VOC concentration released from the VOC adsorption means when the regeneration means regenerates the VOC adsorption means, and thus measures the concentration with high accuracy. be able to. Even when the concentration is low, the VOC concentration in the airflow before passing through the VOC adsorption means can be indirectly measured with high accuracy by calculating backward from the VOC concentration measured by the VOC sensor.
In the VOC removal system according to the present invention, the VOC sensor measures the concentration of the concentrated VOC released from the VOC adsorption unit when the regeneration unit regenerates the VOC adsorption unit, and thus measures the concentration with high accuracy. be able to. The VOC concentration in the indoor air passing through the VOC adsorption means during the adsorption operation is determined from the concentration of the concentrated VOC released from the VOC adsorption means when the regeneration means regenerates the VOC adsorption means even when the concentration is low. By calculating backwards, it is possible to indirectly measure with high accuracy. Indoor air is introduced into the VOC adsorption means during the adsorption operation and the indoor air that has passed through the VOC adsorption means is returned to the indoors, and outdoor air or indoor air is introduced into the VOC adsorption means that is being reproduced and passed through the VOC adsorption means. Can be removed from the indoor air, and the VOC concentration in the indoor air can be lowered to a specified value or less.

Examples of the present invention will be described.

As shown in FIG. 1, the VOC removal system includes a reproducible VOC adsorption rotor 1 that is rotated by being driven by a motor (not shown). The VOC adsorption rotor 1 is formed by forming ceramic paper in a honeycomb shape, and releasing VOC adsorbable and adsorbed VOC such as a material carrying a hydrophobic adsorbent such as hydrophobic zeolite and activated carbon on the VOC adsorption. It is composed of materials that can be reproduced in a possible state. The adsorbent supported on the VOC adsorption rotor 1 is not limited to a hydrophobic adsorbent, and may be a hydrophilic adsorbent such as hydrophilic zeolite, activated alumina, or silica gel depending on the VOC component to be removed.
The VOC removal system further causes indoor air α to flow through the adsorption region 1a of the VOC adsorption rotor that forms the first fan-shaped portion on the front view projection of the VOC adsorption rotor 1, and the indoor air α ′ after passing through the adsorption region 1a. The first air flow path 2 for returning the air to the indoor, the first blower 3 disposed in the first air flow path 2, and the VOC that forms the remaining fan-shaped portion on the front view projection of the VOC adsorption rotor 1 Arranged in the second air flow path 4 and the second air flow path 4 for flowing outdoor air β through the regeneration area 1 b of the adsorption rotor and discharging the outdoor air β ′ after passing through the regeneration area 1 b to the outside The second air blower 5, the VOC adsorption rotor regeneration heater 6 disposed in the second air flow path 4 and upstream of the VOC adsorption rotor 1 with respect to the air flow in the second air flow path 4; 2 VOC suction in the air flow path 4 and the air flow in the second air flow path 4 A VOC sensor 7 arranged at a position where the velocity distribution of the air flow in the second air flow path 4 disturbed by passing through the rotating VOC adsorption rotor 1 downstream of the landing rotor 1 is made uniform, and the VOC sensor 7 and a control device (not shown) for controlling the operation of the first blower 3 and / or the heater 6 and / or the second blower 5 based on the detection information 7.

In the VOC removal system according to the present embodiment, the VOC in the indoor air α flowing through the first air flow path 2 is adsorbed by the adsorption region 1a of the VOC adsorption rotor 1 and passes through the regeneration region 1b of the VOC adsorption rotor 1. Released into heated outdoor air β. The indoor air α ′ from which the VOC has been removed is returned indoors through the first air flow path 2, and the outdoor air β ′ to which the VOC has been added is discharged to the outside through the second air flow path 4. The VOC adsorption rotor 1 that has been regenerated in a VOC adsorbable state by releasing VOC in the regeneration area 1b again adsorbs VOC in the adsorption area 1a. The adsorption and release of VOC by the VOC adsorption rotor 1 are repeated, and the VOC concentration in the indoor air α decreases to a specified value or less.

If the flow rate of the indoor air α flowing through the first air flow path 2 is set larger than the flow rate of the outdoor air β flowing through the second air flow path 4, the VOC in the outdoor air β ′ is in the indoor air α. It is more concentrated than VOC. Even if the VOC concentration in the indoor air α is at a low level where high-precision measurement is impossible, the concentration of the concentrated VOC in the outdoor air β ′ is measured with high accuracy, and the back-calculation from the concentration is performed indirectly. In particular, the VOC concentration in the indoor air α can be measured with high accuracy.
By controlling the operation of the first blower 3 and / or the heater 6 and / or the second blower 5 based on the VOC concentration in the indoor air α that is indirectly measured with high precision, the VOC in the indoor air α is controlled. The concentration can be controlled below a specified value.

An equation for back-calculating the VOC concentration in the indoor air α from the VOC concentration measured by the VOC sensor 7 is divided into a case where only the regeneration is performed after the adsorption of the VOC and a case where the regeneration is performed while adsorbing the VOC. It is shown below.
(1) The VOC adsorption rotor 1 and the first blower 3 are operated, the second blower 5 and the heater 6 are stopped, and only the VOC in the indoor air α is adsorbed for a predetermined time, and then the first blower 3 The VOC adsorption rotor 1, the second blower 5, and the heater 6 are operated, and only the release of the VOC is continued until the entire amount of VOC adsorbed by the VOC adsorption rotor 1 is released into the outdoor air β. When performing C1 = A × Q2 / Q1 × η × a... 1
C1: VOC concentration in indoor air α A: Area surrounded by a time-varying curve of the concentration of concentrated VOC in outdoor air β ′ measured by the VOC sensor 7 (see FIG. 2)
Q1: Flow rate of indoor air α flowing through the first air flow path 2 Q2: Flow rate of outdoor air β flowing through the second air flow path 4 η: VOC adsorption efficiency of the VOC adsorption rotor a: Inverse calculation time 1 of the adsorption process When the VOC concentration of the indoor air α is calculated backward, if the VOC concentration of the indoor air α is high, the VOC adsorption rotor 1 is saturated during the VOC adsorption process, and the calculated indoor air α concentration is incorrect. It should be noted that sometimes In this case, by shortening the duration a of the VOC adsorption process, it is possible to prevent the situation where the VOC adsorption rotor 1 is saturated during the VOC adsorption process, and to maintain the accuracy of the back-calculated indoor air α concentration. it can.
(2) When the VOC adsorption rotor 1, the first blower 3, the second blower 5, and the heater 6 are operated to simultaneously perform VOC adsorption and regeneration. However, it is assumed that the VOC adsorbed in the adsorption region 1a is completely released into the outdoor air β in the regeneration region 1b.
C1 = Q2 × C2 / Q1 × η 2
C1: VOC concentration in indoor air α C2: Concentration value at the time when the gradient of the time-varying curve of the concentrated VOC concentration in outdoor air β ′ measured by the VOC sensor becomes substantially zero (see FIG. 3)
Q1: Flow rate of indoor air α flowing through first air flow path 2 Q2: Flow rate of outdoor air β flowing through second air flow path 4 η: VOC adsorption efficiency of VOC adsorption rotor

By arranging the VOC sensor 7 at a position where the velocity distribution of the air flow in the second air flow path 4 is made uniform and the VOC concentration distribution is made uniform, the accuracy of the VOC concentration measurement can be improved. In general, it is desirable to dispose the VOC sensor 7 at least about 1 m away from the VOC adsorption rotor 1.

By controlling the operation of the first blower 3 and / or the heater 6 and / or the second blower 5 based on the detection information of the VOC sensor 7, the VOC concentration in the indoor air α is reduced to a specified value or less. Nevertheless, it is possible to control the VOC concentration in the indoor air α while eliminating waste of energy consumed by continuing the removal of VOC.

If the VOC concentration in the indoor air α is lower than the specified value, it is not necessary to remove the VOC any more, so the output of the first blower 3 and / or the output of the heater 6 and / or the output of the second blower 5 is reduced. Alternatively, it is desirable to eliminate the waste of energy consumption by stopping the first blower 3 and / or the heater 6 and / or the second blower 5.

Since the VOC adsorption efficiency η of the VOC adsorption rotor 1 is affected by the temperature and humidity of the indoor air α flowing through the adsorption region 1a, the VOC concentration of the indoor air α is determined from the VOC concentration of the outdoor air β ′ measured by the VOC sensor 7. 1 is accurately calculated, the first humidity sensor 8 and the first temperature sensor 9 are arranged in the first air flow path 2 to accurately grasp the VOC adsorption efficiency, as shown by a one-dot chain line in FIG. It is desirable to do.

The shapes of the adsorption region 1a and the regeneration region 1b of the VOC adsorption rotor are not limited to the sector shape. It may be circular, rectangular, trapezoidal or the like.
In FIG. 1, the first blower 3 and the second blower 5 are arranged on the upstream side of the VOC adsorption rotor 1 with respect to the air flow, but the arrangement positions of the first blower 3 and the second blower 5 are the first air flow. Any place in the path 2 and the second air flow path 4 may be used.
The configuration of the VOC sensor 7 is not limited to that disclosed in Patent Document 1.
The rotation of the VOC adsorption rotor 1 may be continuous rotation or stepwise rotation for each predetermined angle.
Instead of the outdoor air β, the indoor air α may flow through the second air flow path 4. In this case, the reverse calculation formula of the VOC concentration in the indoor air α is slightly different from the above formula.

As shown in FIG. 4, a recyclable moisture adsorption rotor 10 is added to the VOC removal system of the first embodiment, and the first air flow path 2 is the first on the front view projection of the rotating moisture adsorption rotor 10. The indoor air α is allowed to flow from the moisture adsorption rotor 10 toward the VOC adsorption rotor 1 through the adsorption region 10a of the moisture adsorption rotor and the adsorption region 1a of the VOC adsorption rotor 1 that form one fan-shaped portion. Is the regeneration region 10b of the moisture adsorption rotor and the regeneration region 1b of the VOC adsorption rotor 1 that form the remaining fan-shaped portion on the front view projection of the rotating moisture adsorption rotor 10, and from the moisture adsorption rotor 10 to the VOC adsorption rotor 1. The outdoor air β may be allowed to flow and discharged to the outdoors. The moisture adsorption rotor 10 is made of a material or the like in which ceramic paper is formed in a honeycomb shape and a hydrophilic adsorbent such as hydrophilic zeolite, activated alumina, or silica gel is supported thereon.
In general, the VOC adsorption performance of the VOC adsorption region 1a of the VOC adsorption rotor 1 decreases when the humidity of the air passing through the region is high. Therefore, with respect to the flow of the indoor air α flowing through the first air flow path 2, the VOC adsorption rotor 1 It is desirable to dispose the adsorption region 10a of the moisture adsorption rotor 10 upstream of the adsorption region 1a to reduce the humidity of the indoor air α passing through the adsorption region 1a of the VOC adsorption rotor 1.

When the humidity of the indoor air α is within an appropriate range, the humidity of the indoor air α passing through the adsorption region 1a of the VOC adsorption rotor 1 is sufficiently lowered by operating the moisture adsorption rotor 10, and the VOC adsorption rotor 1. The VOC adsorption performance can be maintained at an appropriate value. Therefore, in this case, it is desirable to promote the operation of the first blower 3 and / or the heater 6 and / or the second blower 5 to promote VOC removal. On the other hand, when the humidity of the indoor air α is extremely high, the humidity of the indoor air α passing through the adsorption region 1a of the VOC adsorption rotor 1 cannot be sufficiently reduced even if the moisture adsorption rotor 10 is operated. The VOC adsorption performance of the VOC adsorption rotor 1 is reduced. Therefore, in this case, even if the first blower 3 and / or the heater 6 and / or the second blower 5 are operated, VOC removal cannot be promoted. Therefore, when the moisture adsorption rotor 10 is disposed, the second humidity sensor 11 is arranged upstream of the moisture adsorption rotor 10 with respect to the air flow in the first air flow path 2 as shown by a one-dot chain line in FIG. It is desirable to control the operation of the first blower 3 and / or the heater 6 and / or the second blower 5 based on the detection information of the second humidity sensor 11 to eliminate waste of energy consumption.

When the humidity of the indoor air α is extremely high, even if the moisture adsorption rotor 10 is operated, the humidity of the indoor air α passing through the adsorption region 1a of the VOC adsorption rotor 1 cannot be sufficiently reduced, and the VOC The VOC adsorption performance of the adsorption rotor 1 decreases. In this case, even if the operation of the first blower 3 and / or the heater 6 and / or the second blower 5 is promoted, the VOC removal cannot be promoted, so the output of the first blower 3 and / or the heater 6 And / or the output of the second blower 5 is reduced, or the first blower 3 and / or the heater 6 and / or the second blower 5 are stopped to eliminate waste of energy consumption.

When the humidity of the indoor air α is extremely high, even if the moisture adsorption rotor 10 is operated, the humidity of the indoor air α passing through the adsorption region 1a of the VOC adsorption rotor 1 cannot be sufficiently reduced, and the VOC Considering that the VOC adsorption performance of the adsorption rotor 1 is lowered, when both the control based on the humidity of the indoor air α and the control based on the VOC concentration of the indoor air α are performed, the former is given priority over the latter. It is desirable to do this.

The operation of the VOC removal system according to the second embodiment when the system is continuously operated will be described with reference to the flowchart of FIG.
When the main power supply of the system is turned on, the system starts operating. The control device sets the outputs of the first blower 3, the second blower 5, and the heater 6 as specified outputs, and starts VOC removal (S1).
When the humidity of the indoor air α flowing through the first air flow path 2 exceeds the reference value, the control device determines that the effectiveness of VOC removal cannot be expected and determines the first blower 3 and / or the heater 6 and / or The output of the second blower 5 is reduced, or the first blower 3 and / or the heater 6 and / or the second blower 5 are stopped (S2 to S3), and the humidity of the indoor air α flowing through the first air flow path 2 is increased. If it is within the reference value, it is determined that the effectiveness of VOC removal can be expected, and the outputs of the first blower 3, the second blower 5, and the heater 6 are maintained at specified values (S2).
While the VOC concentration in the indoor air α calculated backward from the VOC concentration in the outdoor air β ′ flowing through the second air flow path 4 exceeds the first reference value, the control device 1st fan 3 based on the VOC concentration. The VOC removal is continued without controlling the output of the second blower 5 and the heater 6 (S4, S1 to S4), and the VOC concentration in the indoor air α calculated backward from the VOC concentration in the outdoor air β ′ is the first reference. If it becomes below a value, in order to save power consumption, the output of the 1st air blower 3 and / or the heater 6 and / or the 2nd air blower 5 will be reduced (S4-S5).
While the VOC concentration in the indoor air α calculated backward from the VOC concentration in the outdoor air β ′ flowing through the second air flow path 4 is below the first reference value and exceeds the second reference value, the control device VOC removal is continued without further reducing the output of the blower 3 and / or the heater 6 and / or the second blower 5 (S6, S1 to S6), and the indoor air α calculated backward from the VOC concentration in the outdoor air β ′. If the VOC concentration in the medium becomes equal to or lower than the second reference value, the output of the first blower 3 and / or the heater 6 and / or the second blower 5 is further reduced or the first blower 3 and / or Or the heater 6 and / or the 2nd air blower 5 are stopped (S6-S7).
By maintaining the above operation, the VOC concentration in the indoor air α is maintained below the second reference value.
The operation of the VOC removal system according to the second embodiment is not limited to the above flow. Instead of continuous operation at all times, the system may be operated only when the humidity of the indoor air α is equal to or lower than a predetermined value.

The VOC release performance of the regeneration region 1b of the VOC adsorption rotor 1 depends on the temperature of the outdoor air β flowing through the part. When the temperature rises, the VOC release performance rises, and when the temperature falls, the VOC release performance falls. Accordingly, as shown by the one-dot chain line in FIGS. 1 and 4, the second temperature sensor 12 is disposed in the second air flow path 4 and downstream of the heater 6 with respect to the air flow in the second air flow path 4. Based on the detection information of the second temperature sensor 12, the operation of the heater 6 and / or the second blower 5 is controlled to optimize the temperature of the outdoor air β flowing in the regeneration region 1b of the VOC adsorption rotor 1, and It is desirable to optimize VOC release performance.
If the position where the second temperature sensor 12 is disposed is a position downstream of the VOC adsorption rotor 1 and the velocity distribution of the air flow in the second air flow path 4 is uniform, the temperature distribution of the air flow is also at that position. Since it is considered that the temperature is uniform, it is considered that the average temperature of the airflow flowing through the regeneration region 1b of the VOC adsorption rotor 1 can be detected.

In the first embodiment, instead of the rotating VOC adsorption rotor 1, as shown in FIG. 6, a recyclable VOC adsorption device 1 ′ that does not rotate is interposed between the first air flow path 2 and the second air flow path 4. You may arrange | position so that a movement is possible.
The VOC adsorption device 1 ′ is placed in the first air flow path 2, the first blower 3 is operated for a predetermined time, and the indoor air α is caused to flow through the first air flow path 2 so that the VOC in the indoor air α is The indoor air α ′ that has been adsorbed by the VOC adsorption device 1 ′ and passed through the VOC adsorption device 1 ′ is returned indoors. Next, the VOC adsorption device 1 ′ is moved to the second air flow path 4, the second blower 5 and the heater 6 are operated, the outdoor air β is caused to flow through the second air flow path 4, and the VOC adsorption device 1 ′ is regenerated. However, the VOC concentration in the outdoor air β ′ that has passed through the VOC adsorption device 1 ′ is measured by the VOC sensor 7, and the measured outdoor air β ′ is discharged outdoors. Based on the area measured by the VOC sensor 7 and surrounded by the time variation curve of the VOC concentration, the VOC concentration in the indoor air α is calculated backward using the inverse calculation formula 1 described in the first embodiment.
If the flow rate of the indoor air α is made larger than the flow rate of the outdoor air β, the VOC in the outdoor air β ′ is more concentrated than the VOC in the indoor air α. Therefore, even when the VOC concentration of the indoor air α is low, the concentration of the high concentration VOC in the outdoor air β ′ is accurately measured, and the VOC concentration of the indoor air α is accurately calculated indirectly by calculating back from the concentration. It can be measured.
By alternately repeating the adsorption of VOC by the VOC adsorption device 1 ′ and the regeneration of the VOC adsorption device 1 ′, the VOC concentration of the indoor air α can be lowered to a specified value or less.

In the first embodiment, instead of the rotating VOC adsorption rotor 1, as shown in FIG. 7, a recyclable VOC adsorption device 1 ′ that does not rotate is disposed in the second air flow path 4, and the first air flow path 2 is provided along with the second air flow path 4, the first air flow path 2 is branched from a portion downstream of the VOC adsorption device 1 ′ with respect to the air flow of the second air flow path 4, A flow path switching damper 13 may be disposed at a branch point of the 1 air flow path 2.
The damper 13 is rotated to the second flow path 4 side to prevent the air flow from flowing into the first air flow path 4 downstream from the branch point of the first air flow path 2 and then, after a predetermined time, Thus, the indoor air α flows from the second air flow path 4 toward the first air flow path 2 so that the VOC in the indoor air α is adsorbed by the VOC adsorption device 1 ′, and the indoor air that has passed through the VOC adsorption device 1 ′. Return α 'to indoors. Next, when the damper 13 is rotated to the first flow path 2 side to prevent the air flow from flowing into the first air flow path 2 and the heater 6 is operated, the outdoor air β is brought into the second air flow path 4 together. The VOC concentration in the outdoor air β ′ that has passed through the VOC adsorption device 1 ′ is measured by the VOC sensor 7 while the VOC adsorption device 1 ′ is regenerated, and the measured outdoor air β ′ is discharged outdoors. Based on the area measured by the VOC sensor 7 and surrounded by the time variation curve of the VOC concentration, the VOC concentration in the indoor air α is calculated backward using the inverse calculation formula 1 described in the first embodiment.
If the flow rate of the indoor air α is made larger than the flow rate of the outdoor air β, the VOC in the outdoor air β ′ is more concentrated than the VOC in the indoor air α. Therefore, even when the VOC concentration of the indoor air α is low, the concentration of the high concentration VOC in the outdoor air β ′ is accurately measured, and the VOC concentration of the indoor air α is accurately calculated indirectly by calculating back from the concentration. It can be measured.
By alternately repeating the adsorption of VOC by the VOC adsorption device 1 ′ and the regeneration of the VOC adsorption device 1 ′, the VOC concentration of the indoor air α can be lowered to a specified value or less.

  The present invention is widely applicable to VOC removal systems.

It is an apparatus block diagram of the VOC removal system which concerns on 1st Example of this invention. (A) is a side view, (b) is a bb arrow line view of (a). It is a time change curve of the VOC density | concentration in the outdoor air which passed the VOC adsorption | suction rotor during reproduction | regeneration. It is a time change curve of the VOC density | concentration in the outdoor air which passed the VOC adsorption | suction rotor during reproduction | regeneration. It is an apparatus block diagram of the VOC removal system which concerns on 2nd Example of this invention. It is a flowchart of the operation | movement of the said system in the case of always operating continuously the VOC removal system which concerns on 2nd Example of this invention. It is an apparatus block diagram of the VOC removal system which concerns on 4th Example of this invention. It is an apparatus block diagram of the VOC removal system which concerns on 5th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 VOC adsorption | suction rotor 1a Adsorption area | region 1b Regeneration area | region 2, 4 Air flow path 3, 5 Blower 6 Heater 7 VOC sensor 8, 11 Humidity sensor 9, 12 Temperature sensor 10 Moisture adsorption rotor 10a Adsorption area | region 10b Reproduction area | region alpha Indoor air alpha ' Indoor air β with VOC removed Outdoor air β 'Outdoor air with VOC added

Claims (17)

A reproducible VOC adsorbing means, a blowing means for generating an air flow passing through the VOC adsorbing means, a regenerating means disposed upstream of the VOC adsorbing means with respect to the air flow and regenerating the VOC adsorbing means, and the air flow A VOC sensor disposed downstream of the VOC adsorption means, and the VOC sensor measures the concentration of the concentrated VOC released from the VOC adsorption means when the regeneration means regenerates the VOC adsorption means. VOC concentration measuring device characterized by the above. 2. The VOC concentration measuring apparatus according to claim 1, wherein the VOC sensor is disposed at a position where the velocity distribution of the air flow that has passed through the VOC adsorption means is uniform. A reproducible VOC adsorbing means, a blowing means for generating an air flow passing through the VOC adsorbing means, a regenerating means disposed upstream of the VOC adsorbing means with respect to the air flow and regenerating the VOC adsorbing means, and the air flow A VOC sensor disposed downstream of the VOC adsorption means, a first air guide device for introducing indoor air to the VOC adsorption means during adsorption operation and returning the indoor air that has passed through the VOC adsorption means to the indoors, and the VOC adsorption being regenerated A second air guide device for guiding outdoor air or indoor air to the means and discharging outdoor air or indoor air that has passed through the VOC adsorption means to the outside, and the VOC sensor is used when the regeneration means regenerates the VOC adsorption means. A VOC removal system that measures the concentration of concentrated VOC released from the VOC adsorption means. 4. The VOC removal system according to claim 3, wherein the VOC sensor is disposed at a position where the velocity distribution of the air flow that has passed through the VOC adsorption means is made uniform. A recyclable VOC adsorption rotor that rotates, and a first air flow path for flowing indoor air back into the adsorption area of the VOC adsorption rotor that forms a first area on a front view projection of the rotating VOC adsorption rotor Outdoor air or indoor air is allowed to flow in the regeneration area of the VOC adsorption rotor that forms the remaining area on the front view projection of the rotating VOC adsorption rotor and the first air blowing means disposed in the first air flow path. The second air flow path for discharging to the outdoors, the second air blowing means disposed in the second air flow path, and the VOC in the second air flow path and the air flow in the second air flow path A heating means disposed upstream of the adsorption rotor and a VOC sensor disposed in the second air flow path and downstream of the VOC adsorption rotor with respect to the air flow in the second air flow path, The second blowing means and the heating means; VOC removal system, characterized in that for measuring the concentration of the concentrated VOC emitted from the regeneration zone of the VOC adsorption rotor when operating to reproduce the VOC adsorption rotor. 6. The VOC removal system according to claim 5, wherein the VOC sensor is disposed at a position where the velocity distribution of the air flow in the second air flow path is uniform. The VOC removal system according to claim 5 or 6, further comprising a first humidity sensor and a first temperature sensor disposed in the first air flow path. A rotating moisture adsorption rotor is provided, and the first air flow path is divided into an adsorption region of the moisture adsorption rotor and an adsorption region of the VOC adsorption rotor that form a first region on a front view projection of the rotating moisture adsorption rotor. In addition, indoor air flows from the moisture adsorption rotor to the VOC adsorption rotor, and the second air flow path forms a remaining area on the front view projection of the rotating moisture adsorption rotor, and the regeneration region of the moisture adsorption rotor and the VOC adsorption rotor Outdoor air or indoor air is allowed to flow to the regeneration area and from the moisture adsorption rotor to the VOC adsorption rotor and is discharged to the outside. The heating means is arranged upstream of the moisture adsorption rotor with respect to the air flow in the second air flow path. The VOC removal system according to claim 5, wherein the VOC removal system is provided. 9. The control device according to claim 5, further comprising a control unit that controls the operation of the first blowing unit and / or the heating unit and / or the second blowing unit based on detection information of the VOC sensor. VOC removal system. When the VOC concentration detected by the VOC sensor is equal to or less than a specified value, the control unit reduces the output of the first blowing unit and / or the output of the heating unit and / or the output of the second blowing unit, or the first blowing unit. The VOC removal system according to claim 9, wherein the heating means and / or the second air blowing means are stopped. The VOC removal system according to claim 8, further comprising a control unit that controls the operation of the first blowing unit and / or the heating unit and / or the second blowing unit based on detection information of the VOC sensor. When the VOC concentration detected by the VOC sensor is equal to or less than a specified value, the control unit reduces the output of the first blowing unit and / or the output of the heating unit and / or the output of the second blowing unit, or the first blowing unit. 12. The VOC removal system according to claim 11, wherein the heating means and / or the second air blowing means are stopped. A second humidity sensor is provided in the first air flow path and upstream of the moisture adsorption rotor with respect to the air flow in the first air flow path, and the control means performs the first based on the detection information of the second humidity sensor. 13. The VOC removal system according to claim 11, wherein the operation of the blowing unit and / or the heating unit and / or the second blowing unit is controlled. When the humidity detected by the second humidity sensor exceeds a specified value, the control unit decreases the output of the first blowing unit and / or the output of the heating unit and / or the output of the second blowing unit, or the first blowing unit. 14. The VOC removal system according to claim 13, wherein the means and / or the heating means and / or the second air blowing means are stopped. When the humidity detected by the second humidity sensor exceeds a specified value, the control unit decreases the output of the first blowing unit and / or the output of the heating unit and / or the output of the second blowing unit, or the first blowing unit. When the VOC concentration detected by the VOC sensor is equal to or less than a specified value, the output of the first blowing means and / or the output of the heating means and / or the second 14. The VOC removal system according to claim 13, wherein the output of the two air blowing means is reduced, or the first air blowing means and / or the heating means and / or the second air blowing means are stopped. A second temperature sensor is provided in the second air flow path and downstream of the VOC adsorption rotor with respect to the air flow in the second air flow path, and the control means detects the detection information of the VOC sensor and the detection of the second temperature sensor. The VOC removal system according to any one of claims 5 to 15, wherein the operation of the heating means and / or the second air blowing means is controlled based on the information. The VOC removal system according to claim 16, wherein the second temperature sensor is disposed at a position where the velocity distribution of the air flow in the second air flow path is uniform.

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