WO2011148745A1

WO2011148745A1 - Air purifier and humidifier

Info

Publication number: WO2011148745A1
Application number: PCT/JP2011/059849
Authority: WO
Inventors: 小川昌幸
Original assignee: 株式会社大気社
Priority date: 2010-05-24
Filing date: 2011-04-21
Publication date: 2011-12-01
Also published as: JP2011247454A; JP5302931B2; CN102933910A; KR101754311B1; CN102933910B; KR20130122519A

Abstract

Provided is an air purifier and humidifier that is capable of obtaining the necessary purification performance and the necessary humidification performance while providing a necessary and adequate supply volume of clean water for the required gas component removal efficiency. The air purifier and humidifier purifies the air to be processed (OA) by removing the soluble gas components in the air to be processed (OA), and humidifies the air to be processed (OA), through gas-liquid contact with clean water (W) in a gas-liquid contact chamber (16). The air purifier and humidifier is equipped with: a means for detecting the amount of wastewater (27), which detects the amount of wastewater (Lo) in the used clean water (W') that is to be discharged from the gas-liquid contact chamber (16); and a control means (29), which adjusts the supply volume (Li) of clean water (W) to the gas-liquid contact chamber (16) on the basis of the amount of wastewater (Lo) detected by the means for detecting the amount of wastewater (27), and adjusts the amount of wastewater (Lo) to a set amount of wastewater (SLo).

Description

Air purification humidifier

The present invention relates to an air purification humidifier. This air purification humidifier is used for adjusting the air supplied to a clean room for semiconductor manufacturing.
More specifically, this air purification humidifier has a gas-liquid contact chamber. In this gas-liquid contact chamber, the air to be treated that is ventilated in the room is brought into gas-liquid contact with clean water.
By this gas-liquid contact, the water-soluble gas component in the processing target air is removed, and the processing target air is purified. Further, the air to be treated is humidified along with this air purification.

Conventionally, as this type of air purification humidifier, for example, a circulating water supply type device shown in FIGS. 1 and 2 of Patent Document 1 is known.
This circulating water supply type apparatus includes a storage tank that receives used clean water discharged from the gas-liquid contact chamber (that is, clean water that has absorbed water-soluble gas components contained in the air to be treated).
The clean water taken out from the storage tank is circulated and supplied to the gas-liquid contact chamber, whereby the supplied clean water and the processing target air are brought into gas-liquid contact in the gas-liquid contact chamber.

In this circulating water supply type device, a part of the clean water is spent on humidifying the processing target air and carried away to the processing target air.
Further, the water-soluble gas component absorbed and removed from the air to be treated is brought into the storage tank together with the used clean water.
In response to these matters, a necessary amount of fresh clean water is supplied to the storage tank from the clean water supply means.
By this replenishment, the concentration of the water-soluble gas component of clean water circulated from the storage tank to the gas-liquid contact chamber is kept below a certain value (that is, kept at a certain degree of cleanliness).

On the other hand, for example, a single supercharged water type apparatus shown in FIG.
In this single supercharged water type apparatus, fresh clean water supplied from the clean water supply means is temporarily supplied to the gas-liquid contact chamber.
On the other hand, all used clean water discharged from the gas-liquid contact chamber is discharged outside the apparatus.

In addition, when the clean water supply means purifies the raw water to generate clean water, the single supercharging water type that returns the used clean water discharged from the gas-liquid contact chamber to the clean water supply means as a part of the raw water There is also a device.

By the way, in any of the circulating water supply type and the single supercharging water type air purification humidifiers, with respect to the amount of clean water supplied to the gas-liquid contact chamber, the purification performance for removing water-soluble gas components from the air to be treated The required amount of water for purification necessary for obtaining the required gas component removal efficiency is defined as the basic water amount.
Then, the required amount of water is obtained by adding the necessary amount of water for humidification necessary to humidify the air to be treated to a constant humidified state to the amount of necessary water for purification.

Therefore, when the air to be treated is air having a change in state such as outside air (change in the pre-treatment air state), if the necessary water amount for humidification required for the humidification changes due to the change in the state, the air-liquid contact chamber The required amount of clean water is also changed by the change in the required amount of water for humidification.
However, in the conventional air purification humidifier, a certain large design water amount for humidification with a sufficient safety factor as the amount of water for humidification was set, and this design water amount for humidification was added to the necessary water amount for purification as the basic water amount. The amount of water was the design water supply.
Then, a constant water supply amount operation is performed in which clean water of this constant design water supply amount is continuously supplied to the gas-liquid contact chamber.
That is, the amount of water supply was not adjusted according to the change in the required amount of water for humidification.

Incidentally, in order to cope with the change in the amount of water required for humidification caused by the change in the state of the air to be treated, for example, the state of the air to be treated is detected based on the detected air state. It is also conceivable to increase or decrease the amount of clean water supplied to the gas-liquid contact chamber by the amount of change in the required amount of humidifying water due to the change.
However, in this case, since it is unclear whether the gas component has been removed with the required gas component removal efficiency, it is difficult to obtain an accurate control result for the gas component removal process.

For this reason, adjustment errors and the like are likely to occur in the water supply amount adjustment based on the detected air state as described above. Due to this adjustment error, if the amount of humidification water in the adjusted water supply becomes temporarily insufficient compared to the actual amount of water required for humidification at each point in time, the shortage will be the amount of adjustment water supply. The amount of the water for purification is compensated, and a part of the amount of water for purification is consumed for humidifying the air to be treated together with the amount of water for humidification.
As a result, the gas component removal efficiency (i.e., purification performance) falls below a required value, resulting in a situation in which treated air having a required degree of purification cannot be obtained.

In order to avoid such a situation with certainty, this type of air purification humidifier has conventionally performed a constant water supply amount operation for continuously supplying an excessively constant amount of clean water supply to the gas-liquid contact chamber as described above. It was.

JP 2000-279741 A

However, in the above-described constant water supply operation, since an excessively designed amount of clean water is continuously supplied to the gas-liquid contact chamber, in the circulating water supply system, circulating clean water is supplied from the storage tank to the gas-liquid contact chamber. There was a problem that the pump power to be sent increased and the operation cost increased.

In addition, in a single supercharged water type device, since all of the used clean water discharged from the gas-liquid contact chamber is discharged outside the device, the pump power for supplying fresh clean water to the gas-liquid contact chamber is not only increased. In addition, the consumption of fresh clean water such as pure water supplied to the gas-liquid contact chamber is increased, which causes a problem that the operation cost is further increased.

In view of this situation, the main problem of the present invention is to supply clean water to the gas-liquid contact chamber while reliably and stably obtaining the required purification performance and the required humidification performance by adjusting the rational water supply amount. It is an object of the present invention to provide an air purification humidifier capable of making the amount necessary and sufficient for the required gas component removal efficiency, thereby effectively reducing the operation cost.

The first characteristic configuration of the present invention relating to an air purification humidifier is:
Provided with a gas-liquid contact chamber for bringing the air to be treated that is ventilated indoors into contact with clean water in the room,
This is an air purification humidifier that purifies the processing target air by removing water-soluble gas components in the processing target air by gas-liquid contact with clean water in the gas-liquid contact chamber, and humidifies the processing target air. And
With a wastewater amount detecting means for detecting the amount of used clean water discharged from the gas-liquid contact chamber,
A control means is provided for adjusting the amount of clean water supplied to the gas-liquid contact chamber on the basis of the detected amount of discharged water by the amount of discharged water detecting means to adjust the amount of discharged water to a set amount of discharged water.

That is, the gas component removal efficiency of this type of air purification humidifier contributes to the purification of the air to be treated within the amount of water supplied to the gas-liquid contact chamber if the quality of the clean water supplied to the gas-liquid contact chamber is the same. It is known that it is determined by the ratio (that is, L / G value) between the amount of water to be processed and the air volume of the air to be treated.

However, in this type of air purification humidifier, as described above, when a state occurs in which the amount of water for humidification out of the amount of water supplied to the gas-liquid contact chamber becomes insufficient with respect to the actual amount of water required for humidification at each time point, The shortage is supplemented from the amount of water for purification in the amount of water supplied, and the amount of water contributing to the purification of the air to be treated is insufficient.

On the other hand, if the amount of water for humidification out of the amount of water supply becomes excessive with respect to the actual amount of water required for humidification at each time point, the excess amount is treated together with the amount of water for purification in the amount of water supply. After contributing to the purification of air, it is discharged from the gas-liquid contact chamber.

That is, under the constant water supply amount, when the required water amount for humidification changes due to a change in the state of the treatment target air, the amount of water consumed for humidification of the treatment target air is equal to the actual required water amount for humidification after the change. As a result, the amount of water that contributes to the purification of the air to be treated without being consumed for humidification (ie, that contributes to the purification and is discharged from the gas-liquid contact chamber). The amount of water) changes.

On the other hand, in the air purification humidifier of the first characteristic configuration described above, by adjusting the water supply amount based on the detected drainage amount and adjusting the drainage amount to the set drainage amount, the required gas component removal efficiency is obtained as the set drainage amount. The amount of water equal to the amount of water necessary for purification is set in advance.
Thus, according to the air purification humidifier of the first characteristic configuration, the amount of water consumed for humidification of the water supply amount due to a change in the amount of water required for humidification is preferentially given to the amount of water equal to the amount of water required for humidification after the change. Even with the adjustment, the amount of water that contributes to purification of the air to be treated (ie, the amount of water that becomes the amount of drainage from the gas-liquid contact chamber) of the amount of water supply is maintained at the required amount of water for purification that is set as the set amount of drainage. be able to.

As a result, the gas component removal efficiency (purification performance) can be maintained at the required value regardless of changes in the amount of water required for humidification due to changes in the state of the air to be treated. Can be maintained at the required degree of purification. Further, the humidification performance is maintained by preferentially adjusting the amount of water consumed for humidification with respect to the change in the required amount of water for humidification as described above.

In addition, the detection of the amount of discharged water is generally more reliable in terms of detection accuracy than the detection of air conditions such as humidity and temperature, and detection errors are unlikely to occur. Therefore, if the water supply amount adjustment is based on the detected wastewater amount as described above, the problem with the water supply amount adjustment based on the detected air condition described above, that is, the situation where the gas component removal efficiency falls below the required value due to an adjustment error or the like. Invitation can be avoided more reliably.

For these reasons, according to the air purification / humidification device having the first characteristic configuration described above, the purified water with an excessive design water supply amount can be brought into gas-liquid contact while ensuring the required purification performance and the required humidification performance reliably and stably. Compared to conventional equipment that uses constant feed water supply to the chamber, the amount of clean water supplied to the gas-liquid contact chamber is effectively reduced to the required and sufficient amount for the required gas component removal efficiency. This can effectively reduce the operating cost of the apparatus.

It should be noted that, as a set drainage amount, it is desirable to set a water amount that is somewhat larger than the necessary water amount for purification in consideration of a certain safety factor. However, even in that case, the operating cost can be greatly reduced as compared with the conventional apparatus that performs the operation with a constant water supply amount.

Incidentally, in order to maintain the required purification performance and the required humidification performance against the change in the required amount of water for humidification caused by the change in the state of the air to be treated, the following water supply amount adjustment is also conceivable.
That is, if the amount of water that contributes to the purification of the air to be treated out of the water supply amount due to a change in the amount of water necessary for humidification occurs, the concentration of water-soluble gas components in the used clean water discharged from the gas-liquid contact chamber (i.e. , Absorption gas component concentration) also changes. Therefore, the gas component concentration of the discharged clean water from the gas-liquid contact chamber is detected, and the amount of clean water supplied to the gas-liquid contact chamber is set so as to maintain the gas component concentration of the discharged clean water at the set concentration based on the detected concentration. It is possible to adjust automatically.

However, detection of the gas component concentration in water is generally not reliable in terms of detection accuracy, and detection errors are likely to occur. Therefore, in the adjustment of the water supply amount based on the detected gas component concentration, the gas component removal efficiency is still caused by the adjustment error. It is easy to invite a situation that is below the required value.
In this regard, as described above, the air purification / humidification device having the first characteristic configuration that adjusts the amount of water supply based on the detected amount of wastewater can more reliably avoid such a situation as described above. The amount of clean water supplied can be effectively reduced while reliably and stably obtaining the required purification performance and required humidification performance.

The gas component removal efficiency η referred to here is expressed by the following equation.
η = (Cai−Cao) / Cai
However, Cai: concentration of water-soluble gas component in the air to be treated before treatment Cao: concentration of water-soluble gas component in the air to be treated after treatment

In the implementation of the first characteristic configuration, the contact method between the clean water and the air to be treated is a method in which the clean water is transferred to the surface of the flow-down member in the gas-liquid contact chamber to flow down in a water film state, A method of supplying clean water to a breathable member with moisture content and wettability placed in the contact chamber, or a method of spraying clean water in a high-density state in the gas-liquid contact chamber, or a method combining these methods Various contact methods can be employed.

The clean water to be used (fresh water supplied to the circulation system in the circulating water supply system, fresh clean water supplied to the gas-liquid contact chamber in the single-supercharging water system) is purified water, purified water purified with a filter, etc. Various clean waters can be used as long as they can maintain a substantially constant water quality. Moreover, you may make it use the various aqueous solution which added the chemical | medical agent as clean water.

The air purification humidifier having the first characteristic configuration is particularly effective when air for which the air state before processing such as outside air changes every moment is used as processing target air. However, the air to be treated may be air in which the air state before the treatment does not normally change or does not change so much, and even in that case, it is effective in the sense of preparing for a change in the state of the air to be treated due to some cause.

In addition, the cause of the change in the required amount of water for humidification is not limited to the change in the state of the air to be treated, but may be a change in the required amount of water for humidification due to other causes. Therefore, the required purification performance can be stably maintained with this air purification humidifier.

The second characteristic configuration of the present invention relating to the air purification humidifier is:
An air volume detecting means for detecting an air flow volume of the air to be processed with respect to the gas-liquid contact chamber;
The control means is configured to change the set drainage amount based on the detected ventilation amount of the air volume detection means.

That is, the gas component removal efficiency (purification performance) is the ratio of the amount of water that contributes to the purification of the air to be treated (that is, the amount of water to be drained) and the air volume of the air to be treated without spending humidification, as described above. It is determined by the L / G value. Therefore, when the flow rate of the processing target air to the gas-liquid contact chamber (that is, the processing air volume of the processing target air) changes, the required amount of water for humidification required to humidify the processing target air to a constant humidification state changes proportionally. In addition, the necessary amount of water for purification necessary for obtaining the required gas component removal efficiency (purification performance) also changes with a certain correlation.

On the other hand, in the case of the second characteristic configuration described above, the set drainage amount is changed based on the detected ventilation amount, and the respective correlations exist between the ventilation amount of the air to be treated and the necessary water amount for purification. The amount of water that is equal to the required amount of water for purification corresponding to the amount of ventilation of the air to be treated at the time (practically, the amount of water that allows for a certain degree of safety factor) is set as the set amount of drainage.
In this way, the amount of water consumed for humidifying the air to be treated out of the amount of water supplied is the amount of water required for humidification at each point in time (i.e., with the change in the amount of air flow, as described above). The amount of water that contributes to the purification of the air to be treated (the amount of water that becomes the amount of drainage) is also at each point in time while allowing the self-adjustment to preferentially adjust to the amount of water that is equal to the proportionally required amount of water for humidification) The amount of water required for purification (that is, the amount of water required for purification that changes with a certain correlation as the amount of ventilation changes) can be automatically changed.

As a result, the gas component removal efficiency (purification performance) can be maintained at a required value regardless of the change in the air flow rate of the processing target air, and the degree of purification of the processed air can be maintained at the required degree of purification. In addition, the required humidification performance can be maintained.

Incidentally, as described above, the gas component concentration (absorbed gas component concentration) of the discharged clean water from the gas-liquid contact chamber is detected, and the gas liquid concentration is maintained based on the detected concentration. When adjusting the amount of clean water supplied to the contact chamber, the gas component removal efficiency (purification performance) can be maintained at the required value and the required humidification performance can be maintained even when the flow rate of the target air is changed. can do.

However, as described above, the detection of the concentration of the underwater gas component is generally low in reliability in terms of detection accuracy and easily causes a detection error.
However, with the above configuration in which the set drainage amount is changed based on the detected ventilation rate, the reliability of the ventilation rate detection is high and adjustment errors are unlikely to occur. Inviting a situation below the required value can be avoided more reliably.

The third characteristic configuration of the present invention relating to the air purification humidifier is
As clean water supplied to the gas-liquid contact chamber, fresh clean water supplied from clean water supply means is temporarily supplied to the gas-liquid contact chamber.

That is, the first characteristic configuration and the second characteristic configuration described above can be applied to either a circulating water supply type or a single supercharged water purification humidifier. However, a single supercharging water purifying / humidifying device that temporarily and continuously supplies fresh clean water to the gas-liquid contact chamber can generally obtain higher gas component removal efficiency than a circulating water supply type.

Further, in the first feature configuration and the second feature configuration, the required gas component removal efficiency can be stably maintained even with respect to a change in the state of the air to be treated and a change in the amount of ventilation.

In combination with these, the third characteristic configuration that applies to the single-supercharged air purification humidifier is particularly suitable when a high degree of purification is required as the required degree of purification of the treated air. A suitable air purification humidifier can be obtained.

The fourth characteristic configuration of the present invention relating to the air purification humidifier is
As clean water to be supplied to the gas-liquid contact chamber, mixed water of used clean water discharged from the gas-liquid contact chamber and fresh clean water supplied from clean water supply means is supplied to the gas-liquid contact chamber. It is in the point which is made into composition.

In other words, a circulating water supply type air purification humidifier that only consumes fresh clean water as makeup water consumes essentially less fresh clean water than a single supercharged type.

In the first feature configuration and the second feature configuration, the power consumption of the pump that supplies clean water to the gas-liquid contact chamber can be effectively reduced.

In combination with these, the fourth characteristic configuration for which the circulating water supply type air purification humidifier is applied is particularly required to reduce the operating cost in preference to the gas component removal efficiency. In this case, a suitable air purification humidifier can be obtained.
The fifth characteristic configuration of the present invention relating to the air purification humidifier is:
The gas-liquid contact chamber is equipped with a flow-down medium arranged transversely to the air ventilation path, and a water supply header that drops clean water from above on the flow-down medium,
This falling medium is formed by closely arranging corrugated members in a vertical posture in which a large number of inclined wave portions are formed, and the inclination direction of the inclined wave portions is reversed for each adjacent corrugated member. In the point.
In other words, according to the fifth feature configuration, the ventilation air and the clean water can be efficiently brought into gas-liquid contact, and high performance can be obtained for each of the air purification performance and the air humidification performance.

FIG. 1 is a diagram showing air conditioning equipment for a clean room. FIG. 2 is a diagram showing the configuration of the external air conditioner. FIG. 3 is a perspective view showing the gas-liquid contact portion. FIG. 4 is an explanatory diagram of the material balance at the gas-liquid contact portion.

FIG. 1 shows a clean room air conditioning system. As shown in FIG. 1, fan filter units 2 are arranged side by side in a matrix arrangement across the entire surface of the ceiling of the target room 1 that is a clean room.
The air conditioning air SA supplied to the ceiling chamber 4 by the air supply fan Fs through the air supply path 3 is purified by the high performance filter 2a provided in each fan filter unit 2, and the air conditioning air SA after purification is purified by the fan filter. The fan 2b installed in the unit 2 is blown out and supplied indoors. Thereby, the interior of the target room 1 is adjusted and maintained at a required cleanliness in a required temperature and humidity state.

The lower floor of the target room 1 is an under-floor chamber 6 that receives the air RA discharged from the room through the lattice floor 5 as the purified air conditioning air SA is supplied by the fan filter unit 2.

An air conditioner 7 (air conditioner for adjusting outside air) and an air conditioner 8 are provided for generating the air SA for air conditioning. That is, the outside air OA guided through the outside air introduction path 9 by the outside air fan Fo is adjusted by the outside air conditioner 7, and the adjusted outside air OAs in the outside air conditioner 7 is led to the air conditioner 8 through the relay path 10.
Further, a part of the exhaust air RA received in the underfloor chamber 6 is led to the air conditioner 8 through the return air path 11 by the return air fan Fr as the return air RAs.

Then, the temperature and humidity of the mixed air of the adjusted outside air OAs and the return air RAs are adjusted in the air conditioner 8, and the adjusted air in the air conditioner 8 is used as the air conditioning air SA through the air supply path 3 and the ceiling of the target room 1. Supply to chamber 4.

The remainder of the exhaust air RA received in the underfloor chamber 6 (exhaust air RA in an amount equal to the intake amount of the external air OA from the external air introduction passage 9) is exhausted to the outside through the exhaust passage 12 by the exhaust fan Fe.

As shown in FIG. 2, the external air conditioner 7 includes a filter 13, a preheater 14, a precooler 15, a gas-liquid contactor 16, and a cooler 17 in order from the upper side in the ventilation direction of the outside air OA that is the processing target air. The reheater 18 is installed.

That is, in the outside air conditioner 7, as the adjustment process of the outside air OA, the outside air OA guided through the outside air introduction path 9 is removed by the filter 13, and the removed outside air OA is preheated by the preheater 14 in the winter, and in the summer Is precooled by the precooler 15 and purified by bringing the preheated or precooled outside air OA into contact with the clean water W in the gas-liquid contactor 16 serving as an air purification humidifier, and saturated with the purification. Humidify close.

Then, the outside air OA purified and humidified in the gas-liquid contactor 16 is cooled to a predetermined temperature by the cooler 17, so that the outside air OA is cooled and dehumidified to a predetermined absolute humidity. The heater 18 is reheated to a predetermined temperature, and the temperature / humidity adjusted and purified outside air OA is supplied to the air conditioner 8 through the relay path 10 as adjusted outside air OAs.

As shown in FIG. 3, the gas-liquid contactor 16 is provided with a flow-down medium 19 arranged in a state transverse to the ventilation path of the external air OA in the external air conditioner 7, and clean water W from above on the flow-down medium 19. A water supply header 20 provided with a plurality of dripping openings 20 a and a drain pan 21 that receives the flowing clean water W ′ below the flowing medium 19 are provided.

The falling media 19 is a densely arranged corrugated plate-like member 22 in a vertical posture in which a large number of inclined wave portions 22 a are formed. In the falling media 19, the inclined wave portions are provided for each adjacent wave plate-like member 22. The inclination direction (ridge line direction) of 22a is reversed.

That is, in this gas-liquid contactor 16, the clean water W is dropped from the dropping port 20 a of the water supply header 20 to the flowing-down medium 19, so that the dripped clean water W is supplied to each of the many corrugated plate-like members 22 in the flowing-down medium 19. It is transmitted to the surface and allowed to flow down in the form of a water film.
As a result, the inside of the vessel, which is the space where the falling media 19 is arranged, is used as a gas-liquid contact chamber, and the outside air OA as the processing target air passing through the gap between the corrugated plates 22 is cleaned in the water film state in the process of flowing The water W is brought into gas-liquid contact, and by this gas-liquid contact, the water-soluble gas component contained in the outside air OA is removed to purify the outside air OA, and the outside air OA is humidified to near saturation.

The clean water W dropped from the flow header 20 to the flow medium 19 is pure water W as fresh clean water supplied from the pure water generator 23 as the clean water supply means through the water supply path 24 by the feed pump Pw. The liquid contactor 16 is temporarily supplied.
The flowing clean water W ′ (that is, the used clean water that has absorbed the gas component) received from the draining medium 19 received by the drain pan 21 is discharged to the outside through the drainage channel 25. That is, this gas-liquid contactor 16 is of a supercharged water type.

The water supply path 24 from the pure water generator 23 is equipped with a water supply flow rate adjustment valve 26 that adjusts the water supply amount Li of fresh clean water W (pure water) for the gas-liquid contactor 16, and the gas-liquid contactor 16 A drainage flow meter 27 serving as a drainage amount detecting means for detecting a drainage amount Lo of the used clean water W ′ (used pure water) discharged from the gas-liquid contactor 16 is provided in the drainage channel 25 from the gas-liquid contactor 16.

Furthermore, the flow rate Gi of the outside air OA in the outside air conditioner 7 (in other words, the air amount of the adjusted outside air OAs supplied from the outside air conditioner 7 to the air conditioner 8 is changed according to the usage state of the target room 1. Then, the amount of outside air OA in the gas-liquid contactor 16 changes. On the other hand, the external air conditioner 7 is equipped with an air flow meter 28 as an air flow detecting means for detecting the air flow amount Gi of the outside air OA.

The external air conditioner 7 is supplied with a water supply amount Li of fresh clean water W (pure water) to the gas-liquid contactor 16 based on the detected drainage amount Lo by the drainage flow meter 27 and the detected ventilation amount Gi by the airflow meter 28. A water supply controller 29 is provided as a control means for automatic adjustment.

FIG. 4 shows the material balance in the gas-liquid contactor 16. Each symbol in the figure indicates the following values.
Li: Supply amount of clean water W Lo: Drainage amount of used clean water W ′ Lh: Amount of humidification of outside air OAs after treatment to outside air OA before treatment Gi: Aeration amount of outside air OA Cwi: Water solubility of supplied clean water W Gas component concentration (≒ 0)
Cwo: Water-soluble gas component concentration of used clean water W ′ Cai: Water-soluble gas component concentration of outside air OA before treatment Cao: Water-soluble gas component concentration of outside air OAs after treatment

Here, when the material balance in the gas-liquid contactor 16 is considered, the water-side and air-side substance amounts entering the gas-liquid contactor 16 and the water-side and air-side substance amounts exiting from the gas-liquid contact chamber 16 are: Since they are equal, the following (Formula 1) holds.
Li × Cwi + Gi × Cai = Lo × Cwo + Gi × Cao + Lh × Cwi
......... (Formula 1)

Further, since the water amount obtained by subtracting the humidification amount Lh from the water supply amount Li becomes the drainage amount Lo, the following (Expression 2) is established.
Li = Lh + Lo (Equation 2)

Then, by substituting (Equation 2) into (Equation 1) and rearranging (Equation 1), the following (Equation 3) is obtained.
Lo × (Cwi−Cwo) = Gi × (Cao−Cai) (Equation 3)

On the other hand, the gas component removal efficiency η representing the purification performance of the gas-liquid contactor 16 with respect to the outside air OA is expressed by the following (formula 4).
η = (Cai−Cao) / Cai (Equation 4)

By substituting (Equation 3) into (Equation 4), the gas component removal efficiency η is expressed by the following (Equation 5).
η = (Lo / Gi) × ((Cwi−Cwo) / Cai) (Equation 5)

The water-soluble gas component concentration Cwo of the used clean water W ′ in (Equation 5) is the equilibrium relationship between the water-soluble gas component and water, and the ratio of the waste water amount L of the used clean water W ′ to the outside air flow rate Gi. Determined by (Lo / Gi). When the ratio Lo / Gi increases (that is, the drainage amount Lo increases when the outside air flow rate Gi is constant), the water-soluble gas component concentration Cwo of the used clean water W ′ decreases, and the gas component removal efficiency η Changes in a linear relationship in the upward direction.

Therefore, the factors governing the gas component removal efficiency η in <Formula 5> are the water-soluble gas component concentration Cai of the outside air OA before treatment fixed as the air and water inlet conditions and the water-soluble gas component of the supplied clean water W Excluding the density Cwi (≈0), it is Lo / Gi.

In other words, the gas component removal efficiency η indicating the purification performance is equal to the water supply amount Li for the gas-liquid contactor 16 if the quality of the clean water W supplied to the gas-liquid contactor 16 is the same (that is, Cwi = constant). Therefore, it is determined by the L / G value which is the ratio of the amount of water contributing to the purification of the outside air OA (= the amount of water equal to the amount of drainage Lo) and the amount of the outside air OA (= the amount of ventilation Gi).

On the other hand, in this type of gas-liquid contactor 16, the necessary amount of water for purification Lj required to obtain the required gas component removal efficiency η for the outside air OA with the predetermined ventilation amount Gi is used as the basic amount of water, and the required amount of water for purification Lj is obtained. On the other hand, the amount of water (Lj + Lh) obtained by adding the necessary amount Lh of humidification necessary for humidifying the outside air OA to be treated to a constant humidification state needs to be set as the water supply amount Li.
Therefore, when the water supply amount Li is sufficient, this type of gas-liquid contactor 16 stabilizes the outside air OA to a substantially constant humidity near the saturated state (for example, relative humidity 95%) regardless of the state before the treatment of the outside air OA. Can be humidified.

This is because, under the constant water supply amount Li, when the required water amount Lh for humidification changes due to a change in the state of the outside air OA before processing, the actual amount of water spent for humidifying the outside air OA in the water supply amount Li is changed. The amount of water that is preferentially adjusted to the amount of water equal to the required amount of water for humidification Lh is preferentially adjusted. The amount of waste water Lo) discharged from the gas-liquid contactor 16 changes, and the amount of water for purification (= Lo) becomes insufficient with respect to the amount of water Lj for purification (Lo <Lj) or excessively. This means inviting a state (Lo> Lj).

For these things, the water supply controller 29 is configured to execute the following controls (a) and (b) as a water supply amount adjustment.

(A) By adjusting the feed water flow rate adjustment valve 26 based on the detected drainage amount Lo by the drainage flow meter 27, the drainage amount Lo of the used clean water W ′ (used pure water) discharged from the gas-liquid contactor 16 Is adjusted to the set drainage amount SLo.

(B) The set drainage amount SLo is changed according to the detected ventilation amount Gi by the air flow meter 28. Specifically, for the set drainage amount SLo, the required amount of water for purification Lj with respect to the outdoor air flow rate Gi at each time point is set as a reference water amount, and the amount of water with an allowance for the reference water amount is set as the set drainage amount SLo.

Here, the required amount of water Lj for purification with respect to the outside air flow rate Gi at each time point is an L / G value that is a constant inherent to the apparatus (that is, a constant that varies depending on the contact coefficient or the required removal efficiency η depending on the apparatus shape). In this case, Lj = α × Gi, and the water supply controller 29 determines the set drainage amount SLo at each time point based on the correlation data 30.

That is, regardless of whether the required amount of water for humidification Lh or the required amount of water for purification Lj changes due to a change in the state of the outside air OA or a change in the air volume, the amount of water consumed for humidification in the water supply amount Li as described above Regardless of being preferentially self-adjusted to the amount of water equal to the required amount of water for humidification Lh, the amount of water that contributes to the purification of the outside air OA in the amount of water Li (ie, (b)) (i), (b) , The amount of water equal to the amount of drainage Lo) is adjusted and maintained to be equal to the amount of water Lj required for purification at each time point. Thereby, the required purification performance and the required humidification performance for the outside air OA are stably obtained while reducing the water supply amount Li of the fresh clean water W to the gas-liquid contactor 16 as much as possible.

[Another embodiment]
Next, another embodiment of the present invention will be listed.
In the above-described embodiment, the example of applying the water supply amount control for adjusting the water supply amount Li so that the drainage amount Lo becomes the set wastewater amount SLo is applied to the single-supercharging water purification humidifier, but the same water supply amount control is performed. The present invention may be applied to a circulating water supply type air purification humidifier.

In addition, the air purification humidifier according to the present invention is not limited to the usage mode incorporated in the external air conditioner 7 as shown in the above-described embodiment, but the usage mode incorporated in the normal air conditioner or cooling depending on the case. Various usage forms such as a usage form used alone without a combination with a heater or a heater can be adopted.

When the set drainage amount SLo is changed according to the ventilation amount Gi of the processing target air OA, the ventilation amount detection means is not limited to various anemometers, and recognizes the ventilation amount Gi based on, for example, a change instruction of the ventilation amount Gi. Various detection systems such as a detection system can be used.

The air OA to be treated is not limited to the outside air, but air that requires purification and humidification, such as air that is circulated and supplied to a clean room or exhausted from various facilities intended for recycling, or is accompanied by humidification Any air may be used as long as it requires purification treatment.

The air purification humidifier according to the present invention can be used in various fields that require air purification treatment and humidification treatment, or in various fields that require air purification treatment with humidification.

OA Air to be treated W Clean water 16 Gas-liquid contact chamber W 'Used clean water Lo Drainage volume 27 Drainage volume detection means Li Water supply volume SLO Set drainage volume 29 Control means Gi Ventilation volume 28 Airflow volume detection means 23 Clean water supply means 19 Flowing media 20 Water supply Header 22a Inclined wave part 22

Claims

Provided with a gas-liquid contact chamber for bringing the air to be treated that is ventilated indoors into contact with clean water in the room,
This is an air purification humidifier that purifies the processing target air by removing water-soluble gas components in the processing target air by gas-liquid contact with clean water in the gas-liquid contact chamber, and humidifies the processing target air. And
With a wastewater amount detecting means for detecting the amount of used clean water discharged from the gas-liquid contact chamber,
An air purification humidifier comprising control means for adjusting a supply amount of clean water to the gas-liquid contact chamber based on a detected drainage amount of the drainage amount detection means to adjust the drainage amount to a set drainage amount.
An air volume detecting means for detecting an air flow volume of the air to be processed with respect to the gas-liquid contact chamber;
The air purification humidifier according to claim 1, wherein the control means is configured to change the set drainage amount based on the detected air flow rate of the air volume detection means.
The air purification humidification according to claim 1 or 2, wherein fresh clean water supplied from clean water supply means is temporarily supplied to the gas-liquid contact chamber as the clean water supplied to the gas-liquid contact chamber. apparatus.
As clean water to be supplied to the gas-liquid contact chamber, mixed water of used clean water discharged from the gas-liquid contact chamber and fresh clean water supplied from clean water supply means is supplied to the gas-liquid contact chamber. The air purification humidifier according to claim 1 or 2, wherein the air purification humidifier is configured.
The gas-liquid contact chamber is equipped with a flowing-down medium arranged transversely to the air ventilation path, and a water supply header for dropping clean water from above on the flowing medium,
This falling medium is formed by closely arranging corrugated members in a vertical posture in which a large number of inclined wave portions are formed, and the inclination direction of the inclined wave portions is reversed for each adjacent corrugated member. The air purification humidifier according to any one of claims 1 to 4.