Gas distribution system for liquid nitrogen

Abstract

The utility model belongs to a gas distribution system for liquid nitrogen. Comprising a liquid nitrogen storage tank connected with a liquid nitrogen pipeline, the liquid nitrogen storage tank is connected with a vaporizer through a booster pump, and an outlet of the vaporizer is connected with an IG541 fire extinguishing agent filling system and a standard gas distribution system through a first tee joint; the standard gas distribution system comprises a nitrogen circulation part, and the tail end of the nitrogen circulation part is respectively connected with the high-end gas distribution part and the standard gas distribution system through a second tee joint; the high-end gas distribution part comprises a nitrogen purification system, and the tail end of the nitrogen purification system is connected with a high-end standard gas distribution system; the method has the characteristics of reducing investment, being convenient to control, saving energy consumption and ensuring stable operation of the system.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid nitrogen utilization, in particular to a gas distribution system for liquid nitrogen. Background Art

[0002] Liquid nitrogen gas distribution is mainly used to configure IG541 fire extinguishing agent, standard standard gas distribution and high-end standard gas distribution; IG541 is a mixed gas fire extinguishing agent, which is composed of 52% nitrogen, 40% argon and 8% carbon dioxide. It is a colorless, odorless and non-conductive gas with zero ozone depletion potential and zero greenhouse effect potential. It has a very short residence time in the atmosphere and is a green and environmentally friendly fire extinguishing agent; standard standard gas distribution and high-end standard gas distribution use nitrogen, neon, helium, argon and other gases as balance gases to carry out various gas The filling and mixing of gas types (such as oxygen, hydrogen, carbon monoxide, carbon dioxide, and rare gases such as neon, helium, krypton, and xenon) and components (ppm to percentage levels) can be divided into standard standard gas distribution and high-end standard gas distribution due to the different impurity content in the gas in different electronic gas industries; further, due to the different pressures of the filled IG541 fire extinguishing agent and standard gas, based on this, in traditional technology, a corresponding filling pipeline is required in each filling system. The above method not only requires huge investment (requires multiple filling pumps, etc.), but also has a cumbersome operation process. Utility Model Content

[0003] The utility model provides a gas distribution system for liquid nitrogen, which is used to solve the technical problems raised in the above background technology.

[0004] The technical solution of the utility model is:

[0005] A liquid nitrogen gas distribution system comprises a liquid nitrogen storage tank connected to a liquid nitrogen pipeline, the liquid nitrogen storage tank being connected to a vaporizer via a booster pump, the vaporizer outlet being connected to an IG541 fire extinguishing agent filling system and a standard gas distribution system via a first tee; the standard gas distribution system comprising a nitrogen circulation section, the ends of which are connected to a high-end gas distribution section and a standard standard gas distribution system via a second tee; the high-end gas distribution section comprising a nitrogen purification system, the ends of which are connected to the high-end standard gas distribution system.

[0006] The beneficial effects of the utility model are as follows: the utility model utilizes the characteristic that the same booster pump and vaporizer can produce nitrogen with different pressures, so that the IG541 fire extinguishing agent filling system and the standard gas distribution system use the same filling pipeline, thereby achieving the characteristics of reducing investment costs and facilitating control.

[0007] Preferably, the nitrogen flow passage comprises at least a plurality of filling tanks connected in parallel, a first three-way valve is connected to the plurality of filling tanks through a first valve, and the inlet and outlet of the filling tank are respectively provided with a second valve; a third valve is arranged between the second three-way valve and the high-end gas distribution part; a fourth valve is arranged between the second three-way valve and the standard gas distribution system; and a pressure sensor is arranged between the outlet of the filling tank and the second valve.

[0008] Preferably, a third three-way valve is arranged between the first valve and the plurality of filling tanks connected in parallel, a fourth three-way valve is arranged between the plurality of filling tanks connected in parallel and the second three-way valve, and a shortcut pipeline with a fifth valve is arranged between the third three-way valve and the fourth three-way valve.

[0009] Preferably, a sixth valve is arranged between the first three-way valve and the IG541 extinguishing agent filling system.

[0010] Preferably, the liquid nitrogen storage tank is further connected to a cold energy utilization unit, and the end of the cold energy utilization unit is respectively connected to the pressurization part of the liquid nitrogen storage tank and the nitrogen reheat recycling part.

[0011] Preferably, the cold energy utilization unit comprises an evaporator and a condenser connected in parallel.

[0012] Preferably, the pressurization part of the liquid nitrogen storage tank comprises a self-pressurization pipeline arranged at the lower part of the liquid nitrogen storage tank, the self-pressurization pipeline is connected to the top of the liquid nitrogen storage tank through a self-pressurization valve and a pressurizer, a fifth three-way valve is arranged between the pressurizer and the top of the liquid nitrogen storage tank, a sixth three-way valve is arranged at the end of the cold energy utilization unit, and the second end of the sixth three-way valve is connected to the third end of the fifth three-way valve through a seventh valve.

[0013] Preferably, the nitrogen reheat recycling part comprises that the third end of the sixth three-way valve is connected to a normal-temperature nitrogen pipeline network through the tube side of a nitrogen heater, the shell side inlet of the nitrogen heater is connected to a circulating water inlet pipeline, and the shell side outlet of the nitrogen heater is connected to a circulating water return pipeline.

[0014] Preferably, a seventh three-way valve is arranged on the circulating water inlet pipeline, an eighth three-way valve is arranged between the sixth valve and the IG541 extinguishing agent filling system, an eighth valve is arranged between the eighth three-way valve and the IG541 extinguishing agent filling system, a ninth valve is arranged between the eighth three-way valve and the seventh three-way valve.

[0015] The gas distribution system for liquid nitrogen is characterized in that: the same filling pipeline is used for the IG541 extinguishing agent filling system and the standard gas distribution system, so that the investment cost is reduced and the control is facilitated; further, the filling tanks are arranged in parallel, and the filling tanks are in a one-on-one standby state, the opened filling tank can be used for filling the high-end gas distribution system and / or the standard gas distribution system, and the standby filling tank is used for storing the nitrogen gas from the vaporizer; when the standby filling tank is filled with the nitrogen gas, the system can provide the IG541 extinguishing agent filling system with the nitrogen gas with different pressures at any time; further, the shortcut pipeline with the fifth valve is arranged, so that the standard gas distribution system can be directly filled temporarily when the filling tank is overhauled; the cold energy utilization system is further arranged on the basis of the gas distribution system, the nitrogen gas after the cold energy utilization can be used as the pressurized gas of the liquid nitrogen storage tank, and the nitrogen gas can be recycled and reused after being reheated and being delivered to the normal-temperature nitrogen gas pipeline network; in the reheating process, the nitrogen gas in the pipeline of the IG541 extinguishing agent filling system is used to enter the circulating water inlet pipeline, so as to solve the above technical problems. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model.

[0017] In the figure, 1 is a liquid nitrogen pipeline; 2 is a liquid nitrogen storage tank; 3 is a booster pump; 4 is a vaporizer; 5 is an IG541 extinguishing agent filling system; 6 is a standard gas distribution system; 7 is a nitrogen gas purification system; 8 is a high-end gas distribution system; 9 is a filling tank; 10 is a shortcut pipeline; 11 is a self-pressurizing pipeline; 12 is a booster; 13 is a nitrogen heater; 14 is a normal-temperature nitrogen gas pipeline network; 15 is a circulating water inlet pipeline; 16 is a circulating water return pipeline; 17 is a first three-way joint; 18 is a second three-way joint; 19 is a third three-way joint; 20 is a fourth three-way joint; 21 is a fifth three-way joint; 22 is a sixth three-way joint; 23 is a seventh three-way joint; 24 is an eighth three-way joint; 25 is a first valve; 26 is a second valve; 27 is a third valve; 28 is a fourth valve; 29 is a fifth valve; 30 is a sixth valve; 31 is a seventh valve; 32 is an eighth valve; 33 is a ninth valve; 34 is a pressure sensor; 35 is a self-pressurizing valve; 36 is an evaporator; 37 is a condenser. DETAILED DESCRIPTION

[0018] In order to make the technical personnel in the art better understand the technical scheme of the utility model, the utility model is described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model.

[0019] It should be noted that like reference numerals and characters refer to like elements throughout the several views of the drawings, and that, unless otherwise indicated, like reference numerals and characters in different figures indicate like elements therein.

[0020] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate relative or positional relationships, based on the orientation or position shown in the drawings, or the orientation or position in which the utility model product is usually placed during use, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third", and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0021] In addition, the terms "horizontal", "vertical", "overhanging", and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0022] In the description of the utility model, it should also be noted that, unless otherwise specified and limited, the terms "provided", "mounted", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] For example, Figure 1The utility model discloses a kind of gas distribution systems for liquid nitrogen, including liquid nitrogen storage tank 2 connected with liquid nitrogen pipeline 1, the liquid nitrogen storage tank 2 is connected with vaporizer 4 by booster pump 3, the outlet of vaporizer 4 is connected with IG541 fire extinguishing agent filling system 5 and standard gas distribution system respectively by first three-way 17;The standard gas distribution system includes nitrogen flow passage, and the end of nitrogen flow passage is connected with high-end gas distribution part and standard gas distribution system 6 respectively by second three-way 18;The high-end gas distribution part includes nitrogen purification system 7, and the end of nitrogen purification system 7 is connected with high-end gas distribution system 8.The liquid nitrogen pipeline 1 in the utility model can be connected with liquid nitrogen pipe network or liquid nitrogen output device, and the liquid nitrogen storage tank 2 is conventional liquid nitrogen storage tank, which includes relevant pressure detection device and pressure relief pipeline etc.;Compared with traditional technology, the utility model uses the same booster pump 3 and vaporizer 4 to adjust the pressure of nitrogen, to meet the characteristics of filling IG541 fire extinguishing agent filling system 5 and standard gas distribution system, so as to reduce investment and facilitate operation.The IG541 fire extinguishing agent filling system 5, standard gas distribution system 6, nitrogen purification system 7 and high-end gas distribution system 8 in the utility model are prior art, which can be purchased directly in market, and they are not the focus of the utility model, so they will not be described again.

[0024] Further, the nitrogen flow passage includes at least filling tank 9 arranged in parallel, and the first three-way 17 is connected with the filling tank 9 arranged in parallel through the first valve 25, and the inlet and outlet of the filling tank 9 are respectively provided with the second valve 26;The third valve 27 is arranged between the second three-way 18 and the high-end gas distribution part;The fourth valve 28 is arranged between the second three-way 18 and the standard gas distribution system 6;The pressure sensor 34 is arranged between the outlet of the filling tank 9 and the second valve 26.In the utility model, the filling tank 9 arranged in parallel is used, which has the characteristics of filling one and reserving nitrogen in another one;Meanwhile, the pressure sensor 34 is arranged to detect the timing of reserving nitrogen;Further, the booster pump 3 and the vaporizer 4 can be started at any time to fill the IG541 fire extinguishing agent filling system 5 when there is no need to reserve nitrogen or the reservation of nitrogen is completed, so as to improve the filling efficiency.

[0025] Further, the first valve 25 and the filling tank 9 arranged in parallel are provided with the third three-way 19, the filling tank 9 arranged in parallel and the second three-way 18 are provided with the fourth three-way 20, and the near path pipeline 10 with the fifth valve 29 is arranged between the third three-way 19 and the fourth three-way 20.In the utility model, the near path pipeline 10 with the fifth valve 29 can realize the temporary filling of the standard gas distribution system.

[0026] Further, the sixth valve 30 is arranged between the first three-way 17 and the IG541 fire extinguishing agent filling system 5.

[0027] Further, the liquid nitrogen storage tank 2 is also connected with a cold energy utilization unit, and the end of the cold energy utilization unit is connected with the liquid nitrogen storage tank pressurizing part and the nitrogen reheating recycling part respectively.

[0028] Further, the cold energy utilization unit comprises an evaporator 36 and a condenser 37 arranged in parallel.

[0029] Further, the liquid nitrogen storage tank pressurizing part comprises a self-pressurizing pipeline 11 arranged at the lower part of the liquid nitrogen storage tank 2, the self-pressurizing pipeline 11 is connected with the top of the liquid nitrogen storage tank 2 through a self-pressurizing valve 35 and a pressurizer 12, a fifth three-way pipe 21 is arranged between the pressurizer 12 and the top of the liquid nitrogen storage tank 2, the end of the cold energy utilization unit is provided with a sixth three-way pipe 22, and the second end of the sixth three-way pipe 22 is connected with the third end of the fifth three-way pipe 21 through a seventh valve 31.

[0030] Further, the nitrogen reheating recycling part comprises that the third end of the sixth three-way pipe 22 is connected with a normal-temperature nitrogen pipe network 14 through the tube side of a nitrogen heater 13, the shell side inlet of the nitrogen heater 13 is connected with a circulating water inlet pipeline 15, and the shell side outlet of the nitrogen heater 13 is connected with a circulating water return pipeline 16.

[0031] Further, the circulating water inlet pipeline 15 is provided with a seventh three-way pipe 23, an eighth three-way pipe 24 is arranged between the sixth valve 30 and the IG541 extinguishing agent filling system 5, an eighth valve 32 is arranged between the eighth three-way pipe 24 and the IG541 extinguishing agent filling system 5, and a ninth valve 33 is arranged between the eighth three-way pipe 24 and the seventh three-way pipe 23.

[0032] The utility model discloses a kind of liquid nitrogen gas distribution system's method, which comprises liquid nitrogen gas distribution method and liquid nitrogen cold energy utilization method,

[0033] Liquid nitrogen gas distribution method includes the following steps:

[0034] Step 1: The liquid nitrogen in the liquid nitrogen pipeline 1 enters the liquid nitrogen storage tank 2 for temporary storage. When the IG541 fire extinguishing agent filling system 5 needs to be filled, the booster pump 3 is turned on to pressurize the liquid nitrogen. After pressurization, the liquid nitrogen is sent to the vaporizer 4 for vaporization to ensure that the pressure of the nitrogen meets the filling pressure requirement of the IG541 fire extinguishing agent filling system 5. The sixth valve 30 and the eighth valve 32 are opened to allow the nitrogen to enter the IG541 fire extinguishing agent filling system 5 for filling;

[0035] Step 2: When the standard gas distribution system needs to be filled, the booster pump 3 is turned on to pressurize the liquid nitrogen, and after pressurization, the liquid nitrogen is sent to the vaporizer 4 for vaporization, so that the pressure of the nitrogen meets the filling pressure requirement of the standard gas distribution system, and then enters the filling tank 9; there are two filling tanks 9, one filling tank 9 is used to receive nitrogen from the vaporizer 4, and the other filling tank 9 is used to fill the standard gas distribution system, and the pressure of the nitrogen is detected by the corresponding pressure sensor 34 to determine the start time of the booster pump 3;

[0036] Step 3: When the standard gas distribution system 6 needs to be filled, the fourth valve 28 is opened to allow the nitrogen in the corresponding filling tank 9 to enter the standard gas distribution system 6 for filling;

[0037] Step 4: When the high-end standard gas distribution system 8 needs to be filled, the third valve 27 is opened to allow the nitrogen in the corresponding filling tank 9 to enter the nitrogen purification system 7. Through the principle of catalytic combustion, the impurities such as oxygen, moisture, carbon monoxide, methane, and hydrogen in the nitrogen are reduced to less than 5ppb, and the nitrogen enters the high-end standard gas distribution system 8 as high-purity nitrogen of 99.9999%;

[0038] Step 5: When the standard gas distribution system needs to be temporarily filled, the booster pump 3 is turned on to pressurize the liquid nitrogen, and the pressurized liquid nitrogen is sent to the vaporizer 4 for vaporization, so that the pressure of the nitrogen meets the filling pressure requirement of the standard gas distribution system;

[0039] Step 6: When the standard gas distribution system 6 needs to be filled, open the fifth valve 29 and the fourth valve 28.

[0040] The vaporized nitrogen is directly fed into the standard gas distribution system 6 for filling;

[0041] Step 7: When the high-end standard gas distribution system 8 needs to be filled, the fifth valve 29 and the third valve 27 are opened to allow the vaporized nitrogen to enter the nitrogen purification system 7. Through the principle of catalytic combustion, the impurities such as oxygen, moisture, carbon monoxide, methane, and hydrogen in the nitrogen are reduced to less than 5ppb, and the nitrogen enters the high-end standard gas distribution system 8 as high-purity nitrogen of 99.9999%.

[0042] The method for utilizing liquid nitrogen cooling capacity includes the following steps:

[0043] Step 1: when the cold quantity in liquid nitrogen needs to be utilized, the liquid nitrogen in the liquid nitrogen storage tank 2 enters the evaporator 36 and / or the condenser 37 to utilize the cold quantity;

[0044] Step 2: whether the liquid nitrogen storage tank 2 needs to be pressurized is judged, and when the liquid nitrogen storage tank 2 needs to be pressurized, the seventh valve 31 is opened, and the nitrogen after the cold quantity is utilized enters the liquid nitrogen storage tank 2 to pressurize;

[0045] Step 3: when the liquid nitrogen storage tank 2 does not need to be pressurized, the nitrogen after the cold quantity is utilized enters the nitrogen heater 13, and the circulating water is used for heat exchange, and the nitrogen after the heat exchange enters the normal-temperature nitrogen pipe network 14 to be recycled;

[0046] Step 4: when the evaporator 36 and / or the condenser 37 are not opened, and the liquid nitrogen storage tank 2 needs to be pressurized, the self-pressurizing valve 35 and the pressurizer 12 are opened, and the liquid nitrogen storage tank 2 enters the liquid nitrogen storage tank 2 through the pressurizer 12 to be pressurized;

[0047] Step 5: when the circulating water is used for heat exchange of the nitrogen in step 3, the circulating water has a risk of freezing; the pressurizing pump 3 is opened to pressurize the liquid nitrogen, and the liquid nitrogen after the pressurization is sent into the vaporizer 4 to be vaporized, so that the nitrogen enters the circulating water inlet pipeline 15 through the sixth valve 30 and the ninth valve 33, and the risk of freezing of the circulating water is prevented.

[0048] The utility model can realize full utilization of liquid nitrogen in the liquid nitrogen storage tank, which includes utilization of gas distribution and cold quantity, and can also realize reuse of nitrogen on the basis of full utilization, which includes that the nitrogen after utilization of the cold quantity is used as a medium for pressurization of the liquid nitrogen storage tank, and the nitrogen in the gas distribution pipeline enters the circulating water inlet pipeline 15 together to enter the nitrogen heater 13 to prevent freezing of the circulating water; and has the characteristics of reducing investment, facilitating control, saving energy consumption and ensuring stable operation of the system.

[0049] The standard parts used in the application file can be purchased from the market, and can be ordered according to the description and the drawings, and the specific connection mode of each part adopts the conventional bolt, rivet, welding and other conventional means in the prior art, the machinery, parts and equipment adopt the conventional type in the prior art, the control mode is automatically controlled through the controller, the control circuit of the controller can be realized through simple programming by the person skilled in the art, which belongs to the common knowledge in the field, and the utility model is mainly used for protecting the mechanical device, so the control mode and the circuit connection are not explained in detail, and the external controller mentioned in the description can control the electrical elements mentioned in the text, and the external controller is a conventional known device.

[0050] It should be noted that the terms "comprising", "including", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0051] The principles and implementation modes of the present application are described by using specific examples in the present application. The above example is only used to help understand the method and core idea of the present application. The above is only the preferred implementation mode of the present application. It should be pointed out that due to the limited nature of the expression, there are objectively infinite specific structures. For ordinary skilled persons in the technical field, without departing from the principles of the present application, a number of improvements, refinements or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, changes or combinations, or without improvement, directly apply the concept and technical solution of the present application to other occasions, should be regarded as the protection scope of the present application.

Claims

1. A gas distribution system for liquid nitrogen comprising a liquid nitrogen storage tank (2) connected to a liquid nitrogen pipeline (1), characterized in that: The liquid nitrogen storage tank (2) is connected with the vaporizer (4) through the booster pump (3), the outlet of the vaporizer (4) is connected with the IG541 extinguishing agent filling system (5) and the standard gas distribution system through the first three-way pipe (17) respectively; The standard gas distribution system comprises a nitrogen flow passage, the end of the nitrogen flow passage is connected with the high-end gas distribution part and the standard gas distribution system (6) through the second three-way pipe (18) respectively; The high-end gas distribution part comprises a nitrogen purification system (7), the end of the nitrogen purification system (7) is connected with the high-end gas distribution system (8).

2. The gas distribution system for liquid nitrogen of claim 1, wherein: The nitrogen flow passage comprises at least the filling tank (9) arranged in parallel, the first three-way pipe (17) is connected with the filling tank (9) arranged in parallel through the first valve (25), the inlet and outlet of the filling tank (9) are respectively provided with the second valve (26); The third valve (27) is arranged between the second three-way pipe (18) and the high-end gas distribution part; The fourth valve (28) is arranged between the second three-way pipe (18) and the standard gas distribution system (6); The pressure sensor (34) is arranged between the outlet of the filling tank (9) and the second valve (26).

3. The gas distribution system for liquid nitrogen of claim 2, wherein: The third three-way pipe (19) is arranged between the first valve (25) and the filling tank (9) arranged in parallel, the fourth three-way pipe (20) is arranged between the filling tank (9) arranged in parallel and the second three-way pipe (18), and the near path pipeline (10) with the fifth valve (29) is arranged between the third three-way pipe (19) and the fourth three-way pipe (20).

4. The gas distribution system for liquid nitrogen of claim 1, wherein: The sixth valve (30) is arranged between the first three-way pipe (17) and the IG541 extinguishing agent filling system (5).

5. The gas distribution system for liquid nitrogen of claim 4, wherein: The liquid nitrogen storage tank (2) is also connected with the cold energy utilization unit, the end of the cold energy utilization unit is connected with the liquid nitrogen storage tank booster part and the nitrogen reheat recycling part respectively.

6. The gas distribution system for liquid nitrogen of claim 5, wherein: The cold energy utilization unit comprises the evaporator (36) and the condenser (37) arranged in parallel.

7. The gas distribution system for liquid nitrogen of claim 5, wherein: The liquid nitrogen storage tank booster part comprises the self-boosting pipeline (11) arranged in the lower part of the liquid nitrogen storage tank (2), the self-boosting pipeline (11) is connected with the top of the liquid nitrogen storage tank (2) through the self-boosting valve (35) and the booster (12); The fifth three-way pipe (21) is arranged between the booster (12) and the top of the liquid nitrogen storage tank (2), the end of the cold energy utilization unit is provided with the sixth three-way pipe (22), and the second end of the sixth three-way pipe (22) is connected with the third end of the fifth three-way pipe (21) through the seventh valve (31).

8. The gas distribution system for liquid nitrogen of claim 5, wherein: The third end of the sixth three-way pipe (22) is connected with the normal temperature nitrogen pipe network (14) through the tube side of the nitrogen heater (13); The shell side inlet of the nitrogen heater (13) is connected with the circulating water inlet pipeline (15), and the shell side outlet of the nitrogen heater (13) is connected with the circulating water return pipeline (16).

9. The gas distribution system for liquid nitrogen of claim 8, wherein: The seventh three-way pipe (23) is arranged on the circulating water inlet pipeline (15), the eighth three-way pipe (24) is arranged between the sixth valve (30) and the IG541 extinguishing agent filling system (5), the eighth valve (32) is arranged between the eighth three-way pipe (24) and the IG541 extinguishing agent filling system (5), the ninth valve (33) is arranged between the eighth three-way pipe (24) and the seventh three-way pipe (23).

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