Complementary structure between controlled air systems

Abstract

To provide a complementary structure between control air systems which can prevent an excess of a capacity of a dehumidifier of the control air system in the same system of an air compressor or a different system different therefrom by operating both two sets of the air compressors of one control air system, and can send control air to even an air header of any control air system.SOLUTION: An airflow piping portion P3 at an upstream side rather than a dehumidifier 7a out of the piping P of a control air system 2a, and an airflow piping portion P3 at an upstream side rather than a dehumidifier 7b out of the piping P of a control air system 2b are connected to each other by communication piping 18, and when both air compressors 3b, 4b of the control air system 2b are disordered in operations, air which is compressed by air compressors 3a, 4a of the control air system 2a can be not only dehumidified by the dehumidifier 7a but also dehumidified by the dehumidifier 7b of the control air system 2b via the communication piping 18.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a controlled air system that is provided for each power generation unit in a power plant such as a thermal power plant that has multiple power generation units, and that supplies dehumidified, dust-free controlled air to specified equipment and devices in each power generation unit, and in particular to a system that complements controlled air systems to ensure reliable supply of controlled air. [Background technology]

[0002] In power plants such as thermal power plants with multiple power generation units, each power generation unit is equipped with a controlled air system to supply dehumidified, dust-free compressed air (also referred to as controlled air; the same applies below) to the equipment and devices that require operating air, such as the air-operated valves, instrumentation devices, and control equipment of each power generation unit.

[0003] Each controlled air system includes at least an air compressor (also referred to as a compressor, etc.; the same applies hereinafter), an air tank (also referred to as an air receiver tank; the same applies hereinafter), a dehumidifier, and an air header, as shown in Patent Document 1. Furthermore, each controlled air system has two air compressors, one of which is used regularly and the other is used as a spare.

[0004] Thus, even if each controlled air system has two air compressors, one for regular use and the other as a backup, there are cases where both air compressors malfunction. For this reason, as shown in Figure 7 of Patent Document 1, for example, conventionally, a connecting pipe to the adjacent controlled air system has been provided at the outlet side of the dehumidifier of each controlled air system as a backup. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-186415 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the typical capacity of each dehumidifier in each controlled air system is insufficient to operate both systems and supply sufficient control air to the air-operated valves and other equipment that requires it. For this reason, in a conventional configuration where the outlet of each dehumidifier in each controlled air system is simply connected to the adjacent controlled air system by a connecting pipe, if both air compressors malfunction, the only practical solution is to prepare a temporary air compressor. Consequently, if the temporary air compressor cannot be installed in time, there is a risk that, in the worst case scenario, the power plant's generator may be shut down, resulting in a unit trip.

[0007] In this regard, the backup system for the controlled air system in Patent Document 1 is designed to back up the supply of controlled air using the controlled air system of a power generation unit that is shut down for inspection or the like in the event of an abnormality in the air compressor.

[0008] The backup system for the controlled air systems in Patent Document 1 is configured so that in each controlled air system, a bypass pipe is provided that allows compressed air to flow from the air tank to the air header, bypassing the dehumidifier, and backup piping is provided that sends compressed air from the air header of one controlled air system to between the dehumidifier and air tank of the other controlled air system.

[0009] Accordingly, according to FIG. 3 of Patent Document 1, if the backup system were to be applied when both controlled air systems were in operation, the air compressed by the air compressor of one controlled air system would be sent to the dehumidifier of that system, but the air compressed by the air compressor of the other controlled air system would bypass the other dehumidifier as it was sent to the dehumidifier of that system via the air header of the other controlled air system. For this reason, in FIG. 3 of Patent Document 1, when the other controlled air system is in operation, the compressed air supplied from the air header of the other controlled air system to a specific device or equipment requiring controlled air would be sent without being dehumidified. Therefore, the backup system for the controlled air systems of Patent Document 1 can only be used when one of the two controlled air systems is stopped.

[0010] Furthermore, according to Figures 2 and 4 of Patent Document 1, even when controlled air is sent to both the air header of one controlled air system and the air header of the other controlled air system by operating only the air compressor of one controlled air system or the air compressor of the other controlled air system, it is required that the compressed air sent from both the regular and auxiliary air compressors be dehumidified by only one dehumidifier of one controlled air system or only one dehumidifier of the other controlled air system, which may exceed the capacity of each dehumidifier.

[0011] The present invention has been made in consideration of the above-mentioned problems, and its main object is to provide a complementary structure between controlled air systems that prevents the capacity of a dehumidifier in a controlled air system, whether in the same system as the air compressor or in a different system, from being exceeded by operating both air compressors in the same system, and that allows controlled air dehumidified by the dehumidifier to be sent to the air header of either controlled air system. [Means for solving the problem]

[0012] In order to achieve the above object, the complementary structure between controlled air systems of the present invention comprises a first controlled air system having two air compressors, an air tank in which air compressed by at least one of the two air compressors is stored, a dehumidifier located downstream of the air tank in the air flow direction for dehumidifying the air, an air header to which the air dehumidified by the dehumidifier is sent, and piping for appropriately connecting the air compressor, the air tank, the dehumidifier, and the air header; a second controlled air system having a dehumidifier located downstream of the air tank in the air flow direction for dehumidifying air, an air header to which the air dehumidified by the dehumidifier is sent, and piping for appropriately connecting the air compressor, the air tank, the dehumidifier, and the air header, wherein a piping portion of the piping of the first controlled air system through which air before being dehumidified by the dehumidifier flows is connected to a piping portion of the piping of the second controlled air system through which air before being dehumidified by the dehumidifier flows by a communication piping; When both of the two air compressors of the first control air system among the air compressors are operated, A portion of the air compressed by both of the two air compressors of the first controlled air system is sent to an air header of the first controlled air system after being dehumidified by a dehumidifier of the first controlled air system, and another portion of the air compressed by both of the two air compressors of the first controlled air system is sent to an air header of the first controlled air system before being dehumidified by a dehumidifier of the first controlled air system. the air is sent to the second controlled air system through the connecting pipe, dehumidified by a dehumidifier of the second controlled air system, and then sent to an air header of the second controlled air system; When both of the two air compressors of the second controlled air system among the air compressors are operated, a portion of the air compressed by both of the two air compressors of the second controlled air system is dehumidified by the dehumidifier of the second controlled air system and then sent to the air header of the second controlled air system, and another portion of the air compressed by both of the two air compressors of the second controlled air system is sent to the air header of the second controlled air system before being dehumidified by the dehumidifier of the second controlled air system. the air is sent to the first controlled air system through the connecting pipe, and is dehumidified by a dehumidifier in the first controlled air system, the first controlled air system This allows the air to be sent to the air header.

[0013] More specifically, the complementary structure between the controlled air systems of the present invention comprises a first three-way branch section disposed in a piping portion of the first controlled air system through which air flows before being dehumidified by the dehumidifier, and a second three-way branch section disposed in a piping portion of the second controlled air system through which air flows before being dehumidified by the dehumidifier. DehumidifiedThe air conditioner includes a second three-way branch located in a piping portion through which the preceding air flows, and a connecting pipe located between the first and second three-way branch locations, the first and second three-way branch locations being bifurcated so that a first direction extends to a side from which air is sent out through the pipe toward the dehumidifier, a second direction extends to a side from which air from the air compressor is introduced through the pipe, and a third direction extends to a side not directly connected to the pipe, the connecting pipe being connected to the third direction side of the first and second three-way branch locations and having an on-off valve for controlling the flow of air through the connecting pipe. The connecting pipe may be, for example, a portable hose that can be detachably connected between the first and second three-way branch locations, or may be permanently installed between the first and second three-way branch locations.

[0014] As a result, if both of the two air compressors in the second controlled air system malfunction, both of the two air compressors in the first controlled air system will be operated, and a portion of the air compressed by the air compressor in the first controlled air system will be dehumidified by the dehumidifier in the first controlled air system and then sent directly to the air header of the first controlled air system without passing through the connecting piping, and a portion of the air compressed by the air compressor in the first controlled air system will be sent to the second controlled air system through the connecting piping, dehumidified by the dehumidifier in the second controlled air system, and then sent to the air header of the second controlled air system. Conversely, if both of the two air compressors in the first controlled air system are malfunctioning, both of the two air compressors in the second controlled air system are operated, and part of the air compressed by the air compressor in the second controlled air system is dehumidified by the dehumidifier in the second controlled air system and then sent directly to the air header of the second controlled air system without passing through the connecting piping, and part of the air compressed by the air compressor in the second controlled air system is sent to the first controlled air system through the connecting piping, where it is dehumidified by the dehumidifier in the first controlled air system and then sent to the air header of the first controlled air system. [Effects of the Invention]

[0015] As described above, according to the complementary structure between the controlled air systems of the present invention, even if both of the two air compressors in one of the first and second controlled air systems malfunction and the two air compressors in the other controlled air system supply compressed air for both the first and second controlled air systems, it is not necessary to dehumidify all of the compressed air with the dehumidifier in one of the first and second controlled air systems, and it is possible to send controlled air dehumidified by the dehumidifier to both the air headers of the first and second controlled air systems.

[0016] Furthermore, the complementary structure between the controlled air systems of the present invention makes it possible to make the connecting piping detachable and portable, and when the air compressors of each controlled air system are operating smoothly, the connecting piping can be removed so that no connecting piping is routed between the first and second controlled air systems. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic explanatory diagram showing a state in which the connecting pipe between the first and second controlled air systems has been removed and neither of the two air compressors in each controlled air system is malfunctioning. [Figure 2] This is an air flow diagram showing the flow in which, in a first controlled air system, one of the two air compressors in regular use (or the spare) is operated, and in a second controlled air system, one of the two air compressors in regular use (or the spare) is operated, and controlled air that has been dehumidified by the dehumidifiers in each controlled air system is supplied to equipment and devices that require controlled air. [Figure 3] This is a schematic explanatory diagram showing a state in which a connecting pipe is connected between the first and second controlled air systems because both of the two air compressors in either the first or second controlled air systems are malfunctioning. [Figure 4]This is an air flow diagram showing the flow when, due to malfunction of both air compressors in the second controlled air system, both air compressors in the first controlled air system are operated, and air is sent to the dehumidifier in the first controlled air system while also being sent to the dehumidifier in the second controlled air system via a connecting pipe. [Figure 5] This is an air flow diagram showing the flow when, due to malfunction of both air compressors in the first controlled air system, both air compressors in the second controlled air system are operated, sending air to the dehumidifier in the second controlled air system while also sending air to the dehumidifier in the first controlled air system via a connecting pipe. [Figure 6] FIG. 10 is a schematic explanatory diagram showing a modified example in which a communication pipe is connected between the first and second controlled air systems. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] 1 to 5 show an example of a complementary structure 1 between controlled air systems according to the present invention. Although the entire power plant is not shown, a controlled air system is provided for each power plant unit in a power plant, such as a thermal power plant, that has multiple power plants. The controlled air system supplies dehumidified, dust-free controlled air to specific equipment and devices in each power plant. Specifically, the first and second controlled air systems 2a and 2b shown in FIGS. 1 to 5 are thus part of the multiple controlled air systems possessed by the power plant. In this embodiment, in addition to the first and second controlled air systems 2a and 2b, the power plant also has a third controlled air system (not shown), but the illustration is limited to the first and second controlled air systems 2a and 2b that are relevant to the present invention.

[0020] The first controlled air system 2a shown on the left side in Figures 1 to 5 is for supplying controlled air to equipment and devices 100 (including control panels and the like not shown in between; the same applies hereinafter) that require operating air, such as air-operated valves, instrumentation devices, and control equipment of the power generation unit. The first controlled air system 2a has two air compressors 3a and 4a, an air tank 5a, a carbon filter 6a, a dehumidifier 7a, and an air header 8a. The air compressors 3a and 4a, the air tank 5a, the carbon filter 6a, the dehumidifier 7a, and the air header 8a are connected in this order by piping P as appropriate.

[0021] 1 to 5, the second controlled air system 2b is for supplying controlled air to devices and equipment 200 (including control panels and the like between them; the same applies below) that require operating air, such as air-operated valves, instrumentation devices, and control equipment of the power generation unit. Similar to the first controlled air system 2a, the second controlled air system 2b has two air compressors 3b and 4b, an air tank 5b, a carbon filter 6b, a dehumidifier 7b, and an air header 8b. The air compressors 3b and 4b, the air tank 5b, the carbon filter 6b, the dehumidifier 7b, and the air header 8b are connected in this order by piping P as appropriate.

[0022] The two air compressors 3 (referring to both 3a and 3b; the same applies hereinafter) and 4 (referring to both 4a and 4b; the same applies hereinafter) compress the supplied air to a desired pressure. For example, as shown in FIG. 2, air compressor 3 is operated as the regular machine and air compressor 4 as the standby machine. However, it is also possible to switch between air compressor 4 as the regular machine and air compressor 3 as the standby machine as appropriate. In this embodiment, the most upstream portion P1 of each pipe P is composed of a pipe portion P1a extending from air compressor 3, a pipe portion P1b extending from air compressor 4, and a pipe portion P1c connected to both pipe portions P1a and P1b on one side and connected to air tank 5 on the other side. A check valve 9a or 9b is provided in pipe portion P1a, and a check valve 10a or 10b is provided in pipe portion P1b.

[0023] Air tank 5 (referring to both 5a and 5b; the same applies below) is used to temporarily store the air compressed by air compressors 3 and 4, and is connected to carbon filter 6 (referring to both 6a and 6b; the same applies below) via piping P2. Carbon filter 6 is used to remove foreign matter from the air compressed by air compressors 3 and 4 and purify it.

[0024] Dehumidifier 7 (referring to both 7a and 7b, the same applies below) is used to dehumidify the air compressed by air compressors 3 and 4 to turn it into dry air (controlled air). The capacity of dehumidifier 7 is determined at the time of design depending on the amount of controlled air used. The section of controlled air system 2 up to dehumidifier 7 can be called the wet air region, and the section after dehumidifier 7 can be called the dry air region. Dehumidifier 7 is connected to carbon filter 6 by piping section P3, the details of which will be described later.

[0025] Air header 8 (referring to both 8a and 8b; the same applies below) is connected to dehumidifier 7 via piping section P4, and controls air dehumidified by dehumidifier 7 is sent to it. In this embodiment, piping section P4 is provided with a check valve (not shown). Control air is then sent appropriately from air header 8 to equipment and devices 100, 200 requiring controlled air (only one is shown in the figure, but this is not limited to one) via piping section P5. Note that the equipment and devices 100 to which controlled air is sent from air header 8a of the first controlled air system 2b and the equipment and devices 200 to which controlled air is sent from air header 8b of the second controlled air system 2b are separate entities, with the exception of the auxiliary steam pressure regulator panel of the third controlled air system described below.

[0026] The air header 8a and the air header 8b are connected by a piping section P6 in a dry air region downstream of the dehumidifier 7 in the air flow (also referred to as the outlet side of the dehumidifier 7; the same applies below) so that air from one controlled air system can be sent to the other controlled air system as a backup. In this embodiment, the piping section P6 branches off to a backup piping section P7 for supplying controlled air to equipment and devices (e.g., an auxiliary steam pressure regulator panel) that require controlled air from a third controlled air system (not shown). Therefore, an on-off valve 11a is disposed on the air header 8a side of the branching point of the piping section P7, and an on-off valve 11b is disposed on the air header 8b side of the branching point of the piping section P6. However, if the piping section P7 does not branch off in this way, only one of the on-off valves 11a and 11b may be disposed in the piping section P6. The on-off valves 11a and 11b are, for example, manual valves.

[0027] In this embodiment, a backup piping section P7 extends from the air header 8b to supply control air to equipment and devices (such as an auxiliary steam pressure regulator panel) that require control air of a third control air system (not shown). An on-off valve 13 is disposed in the two piping sections P7. The on-off valve 13 is normally kept closed.

[0028] In this embodiment, a three-way branch 14a is provided in the piping section P3 connecting the carbon filter 6a and the dehumidifier 7a, and a three-way branch 14b is provided in the piping section P3 connecting the carbon filter 6b and the dehumidifier 7b. Each three-way branch 14 (referring to both 14a and 14b; the same applies below) is, for example, T-shaped and is divided into three parts: a first direction extending toward the side where air is sent out through the piping P (piping section P3) toward the dehumidifier 7, a second direction extending toward the side where air from the air compressors 3 and 4 is introduced through the piping P (piping section P3), and a third direction extending toward a side not directly connected to the piping P (piping section P3).

[0029] For example, three-way branching section 14 has extensions 15a and 15b, each with a connecting portion 17a or 17b at its tip, on the third direction side not communicating with piping P (piping portion P3), and on-off valves 16a and 16b are disposed on extensions 15a and 15b. On-off valves 16a and 16b are, for example, manual valves. Portable hose 18, which serves as a controlled air communication pipe between first controlled air system 2a and second controlled air system 2b in the wet air region upstream of dehumidifier 7, is detachably connected to connecting portions 17a and 17b. This configuration eliminates the need to provide on-off valves 16a and 16b on portable hose 18. Since both ends of portable hose 18 can be connected to connecting portions 17a and 17b, the structure of portable hose 18 can be simplified and made lighter.

[0030] In this embodiment, when neither of the two air compressors 3, 4 of each controlled air system 2a, 2b is malfunctioning, the on-off valves 16a, 16b are closed and the portable hose 18 is disconnected from the connections 17a, 17b to prevent the controlled air systems 2a, 2b from collapsing together, as shown in Fig. 1. The on-off valves 11a, 11b, and 13 are also closed. In this way, the ability to disconnect the portable hose 18 eliminates the problem that would arise if the connection 17a of the controlled air system 2a and the connection 17b of the controlled air system 2b were to be permanently installed between them, even when neither of the air compressors 3, 4 is malfunctioning.

[0031] An example of the operation of both controlled air systems 2a and 2b under such conditions will be described with reference to Fig. 2. In the first controlled air system 2a, of the two air compressors 3a and 4a, only the normally-used air compressor 3a is operated, and the air compressed by air compressor 3a passes through air tank 5a and carbon filter 6a and is sent to dehumidifier 7a. After being dehumidified by dehumidifier 7a to become controlled air, it is sent to equipment / device 100 requiring controlled air via air header 8a and piping section P5. In the second controlled air system 2b, of the two air compressors 3b and 4b, only the normally-used air compressor 3b is operated, and the air compressed by air compressor 3b passes through air tank 5b and carbon filter 6b and is sent to dehumidifier 7b. After being dehumidified by dehumidifier 7b to become controlled air, it is sent to equipment / device 200 requiring controlled air via air header 8b and piping section P5. That is, each dehumidifier 7 is used to form controlled air for one controlled air system 2, and only air compressed by the air compressor 3 of the controlled air system 2 to which the dehumidifier 7 belongs is sent for dehumidification, so air exceeding the capacity of the dehumidifier 7 is never sent to the dehumidifier 7. In addition, controlled air dehumidified by the dehumidifier 7 is sent to each air header 8.

[0032] On the other hand, if both of the two air compressors 3 and 4 in either of the controlled air systems 2a and 2b are malfunctioning, the portable hose 18 is connected to the connectors 17a and 17b, and the on-off valves 16a and 16b are opened, as shown in Figure 3. The on-off valves 11a, 11b, and 13 are maintained in a closed state.

[0033] An example of the operation of both the controlled air systems 2a and 2b in such a state will be described with reference to FIGS.

[0034] 4 shows a case where both air compressors 3b and 4b of controlled air system 2b are malfunctioning, and in controlled air system 2a, both air compressors 3a and 4a are operating. The air compressed by air compressors 3a and 4a passes through air tank 5a and carbon filter 6a, and a portion of the air is sent directly to dehumidifier 7a. After being dehumidified by dehumidifier 7a to become controlled air, the air is sent via air header 8a and piping section P5 to equipment and devices 100 that require controlled air. Then, a portion of the air compressed by air compressors 3a and 4a flows from three-way branch 14a through portable hose 18 and three-way branch 14b to dehumidifier 7b. After being dehumidified by dehumidifier 7b to become controlled air, the air is sent via air header 8b and piping section P5 to equipment and devices 200 that require controlled air.

[0035] 5 shows a case in which, contrary to the case in FIG. 4, both of the two air compressors 3a and 4a of the controlled air system 2a are malfunctioning, and in the controlled air system 2b, both of the two air compressors 3b and 4b are operating. The air compressed by the air compressors 3b and 4b passes through the air tank 5b and the carbon filter 6b, and a portion of the air is sent directly to the dehumidifier 7b. After being dehumidified by the dehumidifier 7b to become controlled air, the air is sent via the air header 8b and the piping section P5 to the equipment / device 200 that requires the controlled air. Then, a portion of the air compressed by the air compressors 3b and 4b flows from the three-way branch 14a through the portable hose 18 and the three-way branch 14b to the dehumidifier 7a. After being dehumidified by the dehumidifier 7a to become controlled air, the air is sent via the air header 8a and the piping section P5 to the equipment / device 100 that requires the controlled air.

[0036] In either case, dehumidifier 7a generates controlled air for controlled air system 2a, and dehumidifier 7b generates controlled air for controlled air system 2b. That is, even if both air compressors 3 and 4 of one controlled air system 2 are operating, the air compressed by air compressors 3 and 4 is sent to both dehumidifiers 7a and 7b without concentrating in one of them. Therefore, air exceeding the capacity of dehumidifier 7 is not sent to dehumidifier 7. Therefore, there is no need to renovate, expand, or modify dehumidifier 7 to increase its capacity, and the associated costs are unnecessary. Furthermore, controlled air dehumidified by dehumidifier 7 is sent to both air headers 8. Therefore, the controlled air system 2, which operates both air compressors 3 and 4, does not need to be shut down.

[0037] In each drawing, the three-way branching section 14 is shown to be disposed in the piping section P3 of the piping P, which connects the carbon filter 6 and the dehumidifier 7, but the present invention is not limited to this. Since any piping section through which air compressed by the air compressor 3 but not dehumidified by the dehumidifier 7 flows may be used, the three-way branching section 14 may be disposed in the piping section P2, which connects the air tank 5 and the carbon filter 6, although this is not shown. This makes it possible to prevent the air compressed by the two air compressors 3 and 4 from concentrating on one side of the carbon filter 6.

[0038] Although various explanations have been given regarding the three-way branching sections 14a, 14b and the portable hose 18, the present invention is only required to have a structure that can branch the air compressed by the two air compressors 3, 4 of one controlled air system 2 so that a portion of the air can be dehumidified by the dehumidifier 7a of the first controlled air system 2a, and the other portion can be dehumidified by the dehumidifier 7b of the second controlled air system 2b.

[0039] A modified example in which a communication pipe is connected between the first and second control air systems will be described with reference to Fig. 6. However, the same components as those described in Figs. 1 to 5 will be assigned the same reference numerals and their description will be omitted unless otherwise specified.

[0040] The connecting pipe 19 shown in FIG. 6 is permanently installed between the three-way branches 14a and 14b by connecting to both of the three-way branches 14a and 14b on the third direction sides of the three-way branches 14a and 14b. Unlike the portable hose 18, the connecting pipe 19 does not necessarily have to be detachable. In this embodiment, the connecting pipe 19 includes two manual on-off valves 16a and 16b and an electromagnetic on-off valve 20 located between the on-off valves 16a and 16b. The on-off valve 20 is automatically opened and closed in response to commands (open command and close command) from a control device (not shown). Even with this configuration, as with the air flow diagrams of FIGS. 4 and 5, it is possible to branch the air compressed by the two air compressors 3 and 4 of one controlled air system 2 so that a portion of the air can be dehumidified by the dehumidifier 7a of the first controlled air system 2a and the other portion can be dehumidified by the dehumidifier 7b of the second controlled air system 2b. [Explanation of symbols]

[0041] 1 Complementary structure between controlled air systems 2a First Control Air System 2b Second Control Air System 3a, 3b Air compressor 4a, 4b air compressor 5a, 5b Air tank 7a, 7b Dehumidifier 8a, 8b air headers 14a, 14b Three-way branch 16a, 16b On-off valve 18 Portable hose (connecting piping) 19 Connection piping 20 On-off valve 100 Equipment and devices requiring controlled air 200 Equipment and devices requiring controlled air P piping P1~P5 Piping Section

Claims

1. a first controlled air system including two air compressors, an air tank in which air compressed by at least one of the two air compressors is stored, a dehumidifier located downstream of the air tank in the air flow direction and dehumidifying the air, an air header to which the air dehumidified by the dehumidifier is sent, and piping that appropriately connects the air compressor, the air tank, the dehumidifier, and the air header; A complementary structure between a controlled air system and a second controlled air system having two air compressors, an air tank in which air compressed by at least one of the two air compressors is stored, a dehumidifier located downstream of the air tank in the air flow direction and dehumidifying the air, an air header to which the air dehumidified by the dehumidifier is sent, and piping that appropriately connects the air compressor, the air tank, the dehumidifier, and the air header, a piping portion of the piping of the first controlled air system through which air before being dehumidified by the dehumidifier flows and a piping portion of the piping of the second controlled air system through which air before being dehumidified by the dehumidifier flows are connected by a communication piping, When both of the two air compressors of the first control air system among the air compressors are operated, a portion of the air compressed by both of the two air compressors of the first controlled air system is dehumidified by a dehumidifier of the first controlled air system and then sent to an air header of the first controlled air system, and another portion of the air compressed by both of the two air compressors of the first controlled air system is sent to the second controlled air system through the connecting piping before being dehumidified by the dehumidifier of the first controlled air system, and is dehumidified by the dehumidifier of the second controlled air system and then sent to an air header of the second controlled air system, When both of the two air compressors of the second control air system among the air compressors are operated, a second control air system that is connected to the first control air system via the connecting pipe, and a second control air system that is connected to the second control air system via the connecting pipe, and a third control air system that is connected to the first control air system via the connecting pipe, and a fourth ...

2. a first three-way branch arranged in a piping portion of the first controlled air system through which air flows before being dehumidified by the dehumidifier, a second three-way branch arranged in a piping portion of the second controlled air system through which air flows before being dehumidified by the dehumidifier, and a communication piping arranged between the first and second three-way branching portions, the first and second three-way branch sections are branched so that a first direction extends to a side from which air is sent out through the piping toward the dehumidifier, a second direction extends to a side from which air from the air compressor is introduced through the piping, and a third direction extends to a side not directly connected to the piping, 2. A complementary structure between control air systems according to claim 1, characterized in that the communication pipe is connected to the third direction side of the first and second three-way branch sections, and has an opening / closing valve for controlling the flow of air through the communication pipe.

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