JP2001201105A - Method for controlling indoor oxygen concentration of large-sized facility, and large-sized facility capable of controlling indoor oxygen concentration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling indoor oxygen concentration of large-sized facilities and a large-sized facility, which is capable of controlling indoor oxygen concentration using the method. SOLUTION: An ordinary air-supply system, which supplies ordinary air and an adjusted air-supply system, which supplies air adjusted for oxygen concentration by means of a membrane separator are provided in parallel and connected to a mixing chamber, communicating with the indoor of the large-sized facility. In the adjusted air-supply system, a plurality of parallel circuits which are branched at every oxygen concentration is provided in the flow passage of the adjusted air taken out of the membrane separator and stop valves exclusively used for different oxygen concentrations are connected to the parallel circuits. According to the oxygen concentration required, only the stop valve of the corresponding parallel circuit is opened, and the required amount of adjusted air from the membrane separator and a required amount of ordinary air supplied from the ordinary air supplying system are joined in the mixing chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high oxygen air supply system in which high oxygen air and low oxygen air are supplied by separating and extracting high oxygen air and low oxygen air using a membrane separation device for directly separating oxygen and nitrogen from air in the atmosphere. The oxygen chamber is used for recovery from fatigue, exercise for the elderly, rehabilitation after illness, etc.The hypoxic chamber supplied with hypoxic air belongs to the field of technology used for high altitude training of sports and other, and furthermore, large capacity The present invention relates to an indoor oxygen concentration control method for a large facility requiring control, and a large facility capable of controlling the indoor oxygen concentration by the method.

[0002]

2. Description of the Related Art Conventionally, a membrane separation technique or a membrane separation apparatus for directly separating oxygen and nitrogen from air belongs to a known art (for example, JP-A-63-53109, Japanese Patent Publication No. 1-443).
No. 66).

[0003] Furthermore, high oxygen air and low oxygen air are separated and taken out by the above-mentioned membrane separation device, and a high oxygen chamber for supplying high oxygen air is used for recovery from fatigue, exercise of elderly people, rehabilitation after illness, etc. The low oxygen chamber for supplying oxygen air is also used for sports high altitude training and other techniques. For example, Japanese Patent Application Laid-Open No. 10-216455 and Japanese Patent Application Laid-Open
Each of the methods described in Japanese Patent Application Laid-Open No. 1-227635 is well known.

In the above method for controlling the oxygen concentration in a room, a normal air supply system and a regulated air supply system for supplying air whose oxygen concentration is adjusted by a membrane separation device are provided in parallel, and both systems are mixed to reach a target facility. This is a method of connecting to a chamber and supplying air mixed so that the oxygen concentration is constant in the mixing chamber to the target chamber. When this method is applied to a small-scale facility, the air flow itself is basically small, so that there is no problem even if there is some variation.

[0005]

For example, the oxygen concentration of the low-oxygen air supplied to the low-oxygen chamber used for high altitude training is more than the lowest oxygen concentration for the oxygen concentration range to be controlled in the low-oxygen chamber. Low oxygen air adjusted to a low oxygen concentration must be supplied. As an example,
In the case of a low oxygen chamber where the oxygen concentration is desired to be controlled within the range of 10% to 15%, the oxygen concentration of the low oxygen air to be supplied needs to be set to about 9%. That is, the oxygen concentration in the low-oxygen chamber is reduced from 10% to 10% using low-oxygen air having an oxygen concentration of about 9% as a source.
The control is performed within the range of 15%. Therefore, oxygen concentration 1
Aside from the control of 0%, when the oxygen concentration is controlled to 15%, a large amount of normal air (outside air) is required to dilute the oxygen concentration. Especially when the hypoxia room is a large and large-capacity facility that can be used for high altitude training, the supply amount of the normal air further doubles dramatically,
Not only is the energy consumption high, but also a major problem with the capacity of the blower.

More specifically, a low-oxygen chamber used for high-altitude training is designed to reduce the oxygen concentration at an altitude of 2000 m (about 19%) to the oxygen concentration at an altitude of 3000 m (about 16%).
%) Or an oxygen concentration (about 10%) of an altitude of 6000 m is desired. Moreover, because of its suitability for high altitude training, the hypoxic chamber has a rectangular section of 3 m on a side and a length of 1
In the case of a large facility of about 00 m, the capacity of the low oxygen chamber is 900 L (kiloliter) by simple calculation. Therefore, when the indoor oxygen concentration control method described in FIG. 1 of JP-A-11-276635 and illustrated in FIG. 4 of the present application is used, the air amount q required for the normal air supply system A and the membrane The adjusted air amount Q required for the adjusted air supply system B for adjusting the oxygen concentration in the separation device 11 is roughly calculated as follows.

[0007] Altitude adjusted air amount Q Air amount q Total (unit: L / min) 6000 m: 900 105 1005 3000 m: 900 885 1785 2000 m: 900 1545 2445 However, the above figures are low oxygen supplied from the membrane separation device 11. This is the case where the oxygen concentration of air is 9%.

However, as the capacity and performance of the blower 3 of the normal air supply system A, the air flow per minute is 105 L / mi.
Operating from n to 1545 L / min is practically impossible in its performance. If you use a large-capacity blower that can cover the maximum air volume of 2000m class,
The energy consumption of the motor power at the time of using the minimum air volume of the 000 m class becomes excessively uneconomical.

As a proposal, the control range of the room oxygen concentration required for the low oxygen chamber 1 is 10% to 16%, and 10% to 13.5.
% And a range of 13.5% to 16%. For the former control, low-oxygen air having an oxygen concentration of 9% is supplied, and for the latter control, an oxygen concentration of 12.1% is used. With a configuration in which 5% low oxygen air is supplied, the supply amount q of the normal air can be considerably reduced.

However, it is well known that the separation performance of the membrane separation device 11 is greatly affected by three factors: the temperature T of the air, the air flow rate Q, and the air pressure P. As specific data, FIG. 2 shows the adjusted air flow rate ratio (the ratio between the supplied air and the adjusted low oxygen air amount) on the vertical axis, and the adjusted low oxygen air amount on the horizontal axis. Indicates the oxygen concentration (%). In FIG. 3A, when the air temperature T and the air flow rate Q are constant and the air pressure P on the horizontal axis changes, the reference numeral 1 in FIG.
Low oxygen air Oa exiting towards 1a and 11 in FIG.
The oxygen concentration (%) of each of the high oxygen air Ob flowing toward b
Is shown on the vertical axis. FIG. 3B shows low-oxygen air Oa flowing toward reference numeral 11a in FIG. 1 and reference numeral 1 in FIG. 1 when the air temperature T and the air pressure P are constant and the air flow rate Q on the horizontal axis changes.
The oxygen concentration (%) of each of the high oxygen air Ob flowing toward 1b is shown on the vertical axis.

As deduced from FIGS. 2 and 3,
As described in the above-mentioned plan, the method of supplying the adjusted air having the oxygen concentration suitable for each section by dividing the control range of the indoor oxygen concentration necessary for the low oxygen chamber 1 into a plurality of sections such as high, medium, and low. Although it is understood that it is preferable, since the separation performance of the membrane separation device 11 is greatly influenced by the three factors of the air temperature T, the air flow rate Q, and the air pressure P as described above, as shown in FIG. A single open / close valve 1 at 11 conditioned air outlets
However, it cannot be executed with a configuration having only 2 provided.

It is an object of the present invention, particularly in the case of large facilities,
In addition to improving the controllability by minimizing the fluctuation range of the normal air supply amount, the increase in the capacity of the normal air supply source element (air compressor or blower) can be suppressed, resulting in high efficiency and energy saving. It is an object of the present invention to provide a room oxygen concentration control method capable of controlling a room oxygen concentration.

A second object of the present invention is that the membrane separation apparatus is characterized in that low-oxygen air is separately generated at one outlet and high-oxygen air is separately generated at the other outlet. In the case of a facility, by supplying and mixing the high oxygen air to the normal air supply system, the fluctuation range of the normal air supply amount can be further reduced to improve controllability, and the normal air supply source element ( It is an object of the present invention to provide an indoor oxygen concentration control method capable of suppressing an increase in the capacity of an air compressor or a blower), improving efficiency and saving energy, and a large facility capable of controlling the indoor oxygen concentration.

[0014]

According to the first aspect of the present invention, there is provided a method for controlling the oxygen concentration in a large facility, which requires control of the indoor oxygen concentration. For a large facility, a normal air supply system and a regulated air supply system for supplying air whose oxygen concentration has been adjusted by a membrane separation device are provided in parallel, and the two systems are connected to a mixing room connected to the room of the large facility. Connecting, in the regulated air supply system, a flow path of the regulated air taken out of the membrane separation device is provided with a parallel circuit branched into a plurality of portions for each oxygen concentration, and a dedicated on-off valve for each oxygen concentration in each parallel path. In accordance with the oxygen concentration required for the regulated air supply system, only the corresponding parallel path open / close valve is opened, and the required amount of regulated air whose oxygen concentration is adjusted by the membrane separation device, and the normal air supply From the strain Normal air required amount to be fed are merged with each mixing chamber, and supplying to large facilities that require mixed air in the mixing chamber to control the indoor oxygen concentration.

According to a second aspect of the present invention, there is provided a method for controlling the concentration of oxygen in a room of a large facility, wherein the oxygen concentration is controlled by a normal air supply system and a membrane separation apparatus for a large facility requiring the control of the indoor oxygen concentration. A regulated air supply system for supplying regulated air is provided in parallel, and the two systems are connected to a mixing chamber connected to the room of the large facility.The regulated air supply system is connected to one outlet of the membrane separation device. In the flow path of the taken-out adjusted air, a parallel circuit branched into a plurality of parts for each oxygen concentration was provided, and a dedicated opening / closing valve was connected to each parallel path for each oxygen concentration, and taken out from the other outlet of the membrane separation device. The flow path of the regulated air is connected to the supply system of the normal air, and according to the oxygen concentration required for the regulated air supply system, only the corresponding on-off valve of the parallel path is opened, and the oxygen concentration is adjusted by the membrane separation device. Adjusted need The adjusted air and the normal air supplied from the normal air supply system are added with the adjusted air taken out from the other outlet of the membrane separation device, and the required amount of air is respectively joined in the mixing chamber, and mixed in the mixing chamber. The air is supplied to a large facility that needs to control indoor oxygen concentration.

The large-scale facility capable of controlling the indoor oxygen concentration according to the third aspect of the present invention is a large-scale facility requiring the control of the indoor oxygen concentration, and is provided with an ordinary air supply system and a membrane separation device. A regulated air supply system for supplying regulated air is provided in parallel, and the two systems are connected to a mixing chamber connected to a room of a large facility, and the regulated air supply system is taken out of the membrane separation device. In the flow path of the regulated air, a plurality of parallel circuits are provided which are branched into a plurality of sections for each oxygen concentration, and a dedicated opening / closing valve is connected to each parallel path for each oxygen concentration. According to the concentration, only the corresponding on-off valve of the parallel path is opened, and the required amount of adjusted air obtained by adjusting the oxygen concentration by the membrane separation device and the required amount of normal air supplied from the normal air supply system are respectively supplied to the mixing chamber. Merge Air mixed in the mixing chamber, characterized in that it is supplied to the large facilities.

The large-scale facility capable of controlling the indoor oxygen concentration according to the fourth aspect of the present invention is a large-scale facility requiring the control of the indoor oxygen concentration, and is provided with a normal air supply system and a membrane separation device. A regulated air supply system for supplying regulated air is provided in parallel, and the two systems are connected to a mixing chamber leading to a room of a large facility, and the regulated air supply system includes one of a membrane separation device. In the flow path of the conditioned air taken out from the outlet, a parallel path branched into a plurality of sections for each oxygen concentration is provided, and a dedicated opening / closing valve is connected to each parallel path for each oxygen concentration, and the other of the membrane separation device. The flow path of the conditioned air taken out from the outlet is connected to the normal air supply system via an on-off valve on the way, and a corresponding parallel air supply is required depending on the oxygen concentration required for the conditioned air supply system. Open only the on-off valve of the road, The necessary amount of adjusted air obtained by adjusting the oxygen concentration in the separation device, and the normal air supplied from the normal air supply system, the adjusted air taken out from the other outlet of the membrane separation device is added to the required amount of air, respectively. The air is combined in the mixing chamber, and the mixed air in the mixing chamber is supplied to a large facility.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
The embodiment of the large-scale facility 1 capable of controlling the indoor oxygen concentration according to the inventions according to the third and fourth aspects of the present invention, which implements the indoor oxygen concentration control method for a large-scale facility according to the invention described in (1). The present embodiment relates to a large-sized low oxygen chamber 1 used for high altitude training or the like.

A normal air supply system A and a regulated air supply system B for supplying air whose oxygen concentration has been adjusted by the membrane separation device 11 to the mixing chamber 2 located immediately before the large facility 1 for controlling the indoor oxygen concentration. Are connected in parallel.

In the normal air supply system A, a flow control valve 5 (automatic valve) is provided in the middle of an air pipe 4 extending from a blower 3 as a normal air supply source element. This flow control valve 5 is provided with a sensor 6 for measuring the oxygen concentration in the mixing chamber 2.
Of the mixing chamber 2 by the controller 7 to which the measured value of
The normal air flow rate q is automatically controlled so that the air concentration in the inside becomes the control target value (set value).

On the other hand, the regulated air supply system B is provided with a low-oxygen gas taken out from one regulated air take-out port 11a of the membrane separation device 11 connected to the compressor 10, which is an element for supplying atmospheric air to the membrane separation device 11. Depending on the oxygen concentration in the air flow path (for example, 9%, 12.5%, 15%, etc.)
In this configuration, parallel circuits 12a, 12b, and 12c branched into a plurality are provided, and dedicated on-off valves 13a, 13b, and 13c that are appropriate for each oxygen concentration are connected to each parallel flow path.

An automatic switching valve 14 is provided downstream of the parallel circuit. The automatic switching valve 14 automatically switches the automatic switching valve 14 to the external exhaust according to the oxygen concentration and the like measured by the safety sensor 15 which also measures the oxygen concentration and the like in the mixing chamber 2, and the large facility (low oxygen chamber) ) Keep the living environment inside 1 safe.

Incidentally, as described above, a plurality of parallel circuits 12a, 12b, 12 which differ depending on the oxygen concentration of the low oxygen air taken out from the conditioned air outlet 11a of the membrane separation device 11 are provided.
c, and an on-off valve 1 dedicated to each oxygen concentration in each parallel flow path.
The reason why 3a, 13b and 13c are connected is as follows.

The control range of the oxygen concentration required for the large facility (low oxygen chamber) 1 is, for example, 2000 m above-mentioned altitude.
When the range extends from a class (oxygen concentration of about 19%) to an altitude of 6000 m (oxygen concentration of about 10%), the control range is, for example, an oxygen concentration of 10% with the lower limit of the altitude of 6000 m (oxygen concentration of about 10%) Oxygen concentration up to 3000 m class (oxygen concentration about 16%) and oxygen concentration up to 2000 m class (oxygen concentration about 19%) It has already been described in the section of the above-mentioned problem that the division into three (plural) of 16% or more is advantageous for control. Therefore, each of the above categories ~
Membrane separation device 11 so as to be appropriate for controlling the oxygen concentration of
This is because the oxygen concentration of the low oxygen air adjusted in the above can be supplied at 9%, 12.5%, and 15%. That is, the above-described on-off valves 13a, 13b, 13c
Represent the oxygen concentration of the low oxygen air of 9%, 1
Dedicated valves for 2.5% and 15% are selected.

In the above example, when the indoor oxygen concentration is controlled by the method of this embodiment, the air amount q required for the normal air supply system A and the regulated air supply system B for adjusting the oxygen concentration by the membrane separation device 11 are provided. The required adjusted air amount Q is roughly calculated as follows.

Altitude adjustment air volume Q Air volume q Total (unit: L / min) 6000 m: 900 105 1005 3000 m: 1050 525 1575 2000 m: 1050 675 1725

When this is compared with the above-mentioned numerical values of the prior art, it is apparent at a glance that the fluctuation of the normal air amount q is about 6
6 times, and 105 L / min per minute, 6
Even at 75 L / min, it is within the normal capacity range of the blower 3, and there is no problem.

The above is an explanation of the first and third embodiments of the present invention. Next, an embodiment of the present invention will be described with reference to FIG.

Most of the inventions according to claims 2 and 4 have the same construction as the inventions according to claims 1 and 3, but the other conditioned air outlet 11b of the membrane separation apparatus 11 is also provided.
The feature is that the effective utilization of the high oxygen air taken out of the air. That is, the flow path of the high oxygen air taken out from the regulated air outlet 11b is connected to the air pipe 4 of the normal air supply system A via the automatic switching valve 16 on the way. The automatic switching valve 16 is also automatically controlled through the controller 7 based on the measured value of the oxygen concentration sensor 6 described above.

Therefore, the control of the low oxygen concentration in the large-scale facility 1 is performed as a first step by opening only one of the on-off valves 12a to 12c of the corresponding parallel path according to the control range described above. Low oxygen concentration (9%, 12.5%, 1
5%) is supplied to the mixing chamber 2. For example, when the control range is 10% to 13.5%, conditioned air with an oxygen concentration of 9% is used. When the control range is 13.5 to 16%, conditioned air with an oxygen concentration of 12.5% is used. Adjusted air having a concentration of 15% is supplied to the mixing chamber 2. At the same time, normal air at a predetermined flow rate is also supplied to the mixing chamber 2 through the normal air supply system A.
The air is supplied to the large facility 1 by mixing the two airs to produce air having a low oxygen concentration as a target, as in the case of the first embodiment.

As a second step, in the above-mentioned oxygen concentration control method, when the amount of normal air to be supplied in the normal air supply system A increases and the load on the blower 3 increases, the switching valve 16 is turned on. When opened, the high oxygen air obtained from the outlet 11b is combined with the normal air. As a result, since the oxygen concentration of the normal air increases, the control target low oxygen concentration can be easily achieved even if the supply amount of the normal air is relatively small.

Alternatively, when high oxygen air is used from the beginning, the basic capacity of the blower 3 can be similarly reduced to a smaller grade.

In the above embodiment, the case where the large facility 1 is used as a low oxygen chamber has been described, but the present invention is not limited to this. Conversely, when the large facility 1 is used as a high oxygen chamber, the adjusted air outlet 11a of the membrane separation device 11 is used.
Exactly the same can be achieved by using diametrically and 11b oppositely.

Reference numeral 20 in FIG. 1 indicates a damper for discharging air from the large facility 1.

[0035]

According to the present invention, there is provided a method for controlling the oxygen concentration in a room of a large facility according to the present invention.
According to the large facility capable of controlling the indoor oxygen concentration according to the invention described in 4, the air load on the blower of the normal air supply system can be reduced, particularly when the operation is performed in a large facility,
It can be implemented economically with low energy consumption.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a large facility that implements the indoor oxygen concentration control method according to the present invention.

FIG. 2 is a correlation diagram between an adjusted air flow rate ratio and an oxygen concentration in the membrane separation device.

FIGS. 3A and 3B are correlation diagrams of oxygen concentration, pressure, and flow rate of conditioned air in a membrane separation device.

FIG. 4 is a circuit diagram showing an embodiment of a large facility that implements a conventional indoor oxygen concentration control method.

[Explanation of symbols]

 A Normal air supply system B Regulated air supply system 1 Target large facility 2 Mixing chamber 11 Membrane separation device 11a One regulated air outlet 11b The other regulated air outlet 12a-12c Parallel circuit 13a-13c Open / close valve 16 Switching valve ( On-off valve)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryoichi Yoshida 3-5-6 Tenjinbashi, Kita-ku, Osaka-shi, Osaka Prefecture F-term (reference) 4C341 KL06 4D006 GA41 KE12P KE12Q KE13P KE13Q MB04 PB17 PB62 PC73 PC80

Claims (4)

[Claims] 1. A large-scale facility requiring control of indoor oxygen concentration is provided in parallel with a normal air supply system and a regulated air supply system for supplying air whose oxygen concentration has been adjusted by a membrane separator. The two systems are connected to a mixing chamber connected to the room of a large facility.The regulated air supply system has a parallel circuit that is branched into a plurality of circuits for each oxygen concentration in a flow path of the regulated air taken out from the membrane separation device. A dedicated on-off valve is connected to each parallel path for each oxygen concentration, and only the corresponding on-off valve is opened according to the oxygen concentration required for the regulated air supply system. A large facility where the required amount of adjusted air with adjusted concentration and the required amount of normal air supplied from the normal air supply system are combined in the mixing chamber, and the mixed air in the mixing chamber needs to be controlled for indoor oxygen concentration. What Characterized by feeding, indoor oxygen concentration control method of the large facilities. 2. A large-scale facility requiring control of indoor oxygen concentration is provided in parallel with a normal air supply system and a regulated air supply system for supplying air whose oxygen concentration has been adjusted by a membrane separator. The two systems are connected to a mixing chamber that is connected to the room of a large facility.The regulated air supply system is branched into a plurality of passages for the oxygen concentration in a flow path of the regulated air taken out from one outlet of the membrane separation device. A parallel circuit is provided, and a dedicated on-off valve is connected to each parallel path for each oxygen concentration. A flow path of the conditioned air taken out from the other outlet of the membrane separation device is connected to the normal air supply system. In accordance with the oxygen concentration required for the regulated air supply system, only the corresponding on-off valve of the parallel path is opened, and the required amount of regulated air whose oxygen concentration has been adjusted by the membrane separation device and the normal air supply system Normal sky The adjusted air taken out from the other outlet of the membrane separation device is added, and the required amount of air is combined in the mixing chamber, and the mixed air in the mixing chamber is sent to a large facility that requires control of the indoor oxygen concentration. A method for controlling the oxygen concentration in a room of a large facility, characterized by supplying the oxygen. 3. An ordinary air supply system and a regulated air supply system for supplying air whose oxygen concentration has been adjusted by a membrane separation device are provided in parallel for a large facility requiring control of indoor oxygen concentration. The two systems are connected to a mixing chamber that is connected to the room of the large facility. A circuit is provided, and a dedicated on-off valve is connected to each parallel path for each oxygen concentration, and according to the oxygen concentration required for the regulated air supply system, only the corresponding on-off valve is opened, and the membrane is opened. The required amount of adjusted air whose oxygen concentration has been adjusted by the separator and the required amount of normal air supplied from the normal air supply system are respectively combined in the mixing chamber, and the mixed air in the mixing chamber is supplied to a large facility. Especially To be, capable of controlling large-scale facilities indoor oxygen concentration. 4. A large-scale facility requiring control of indoor oxygen concentration is provided with a normal air supply system and a regulated air supply system for supplying air whose oxygen concentration is adjusted by a membrane separation device in parallel, The two systems are connected to a mixing chamber that is connected to the room of the large facility.The regulated air supply system has a plurality of passages of regulated air taken out from one outlet of the membrane separation device for each oxygen concentration. A branched parallel circuit is provided, and a dedicated opening / closing valve is connected to each parallel path for each oxygen concentration.The flow path of the conditioned air taken out from the other outlet of the membrane separation device is provided with an opening / closing valve on the way. Via the normal air supply system, and according to the oxygen concentration required for the regulated air supply system, only the corresponding on-off valve of the parallel path is opened, and the oxygen concentration is adjusted by the membrane separation device. Required amount of conditioned air, To the normal air supplied from the normal air supply system, adjusted air taken out from the other outlet of the membrane separation device is added, and the required amount of air is combined in the mixing chamber, and the mixed air in the mixing chamber is large. A large facility capable of controlling indoor oxygen concentration, which is supplied to the facility.