CN115414620A - Liquid nitrogen extinguishing device based on preaction system - Google Patents

Abstract

The invention relates to a liquid nitrogen fire extinguishing device based on a preaction system, which includes a nitrogen tank, a liquid nitrogen tank, a gas pipeline connected to the output end of the nitrogen tank, several open nozzles arranged at the end of the gas pipeline, and a The nitrogen pipeline at the output end of the nitrogen tank and a number of closed nozzles arranged at the end of the nitrogen pipeline are equipped with detection devices in the protection zone. A pre-action system is provided on the nitrogen delivery pipeline, and a nitrogen generator is provided between the nitrogen tank and the liquid nitrogen tank; a controller is also included to control the opening and closing of each pipeline; the present invention can use phase nitrogen and liquid nitrogen respectively For the function of fire extinguishing, the nitrogen generator can realize the mutual conversion from nitrogen to liquid nitrogen, ensure the continuous supply of liquid nitrogen, and realize recycling. At the same time, the liquid nitrogen tank is combined with the pre-action system, and the liquid nitrogen is used as the main fire extinguishing agent to directly act on the protected area to improve the fire extinguishing efficiency, and at the same time, it can avoid the adverse effects of liquid nitrogen spraying on the protected area.

Description

A liquid nitrogen fire extinguishing device based on preaction system

technical field

The invention relates to a liquid nitrogen fire extinguishing device based on a preaction system.

Background technique

Due to the unique advantages of liquid nitrogen, such as colorless, odorless, non-corrosive, non-flammable, and extremely low temperature, its application in fire control and fire extinguishing has been continuously broadened and developed. Existing systems use liquid nitrogen for fire prevention and extinguishing mainly in two ways. One is to inject liquid nitrogen directly into the protected area through pipelines. Due to the lack of nitrogen-generating equipment in the existing system, the continuous supply of liquid nitrogen cannot be guaranteed, and it is impossible to carry out long-lasting fire-fighting operations. The second is to use liquid nitrogen as an auxiliary fire extinguishing agent, use its cooling capacity to cool the main fire extinguishing agent, and then inject it into the fire area, but this will cause a large amount of liquid nitrogen to gasify.

For example, the invention patent application with the publication number CN111803826A discloses a mobile liquid nitrogen fire extinguishing system for an integrated pipe gallery, including a nitrogen making component, a fire extinguishing component, a monitoring device and a nitrogen pipeline; the mobile fire extinguishing component includes a liquid nitrogen storage tank And the liquid nitrogen booster pump, the liquid nitrogen storage tank is connected with the liquid nitrogen booster pump, the liquid nitrogen booster pump transmits the liquid nitrogen to the branch pipe in the pipe gallery through the nitrogen delivery pipeline, and the branch pipe is provided with a nitrogen injection port; The nitrogen component is mobile and transmits the prepared liquid nitrogen to the liquid nitrogen storage tank; the monitoring device includes a first monitoring component and a second monitoring component; the controller automatically adjusts the pressure in the liquid nitrogen storage tank through the first monitoring component, Automatic replenishment of liquid nitrogen; the controller monitors the flow of liquid nitrogen into the nitrogen pipeline through the second monitoring component.

Another example is the invention patent application with the publication number CN104775843B, which discloses a liquid nitrogen fire extinguishing system, including a liquid nitrogen tank car, and the liquid nitrogen tank car is connected with a pump, a shaft and a liquid nitrogen delivery supervisor in sequence, and the liquid nitrogen delivery supervisor A liquid nitrogen direct injection pipe for injecting liquid nitrogen into the goaf and a liquid nitrogen gasification device for gasifying liquid nitrogen into nitrogen and injecting it into the goaf are respectively connected, and the goaf is provided with an exhaust The exhaust pipe is connected to the return air pipeline, and the first control valve is arranged on the exhaust pipe, and a sensor for monitoring the pressure is also arranged in the goaf.

The above two existing patent applications all use liquid nitrogen as a fire extinguishing agent for fire extinguishing, but neither can guarantee the continuous supply of liquid nitrogen.

Contents of the invention

The technical problem to be solved by the present invention is to provide a liquid nitrogen fire extinguishing device based on a pre-action system, which can ensure sufficient supply of liquid nitrogen and continuous fire extinguishing. efficiency.

The technical scheme adopted in the present invention is:

A liquid nitrogen fire extinguishing device based on a pre-action system, which includes a nitrogen tank, a liquid nitrogen tank, a gas pipeline connected to the output end of the nitrogen tank, several open nozzles arranged at the end of the gas pipeline, connected to the liquid nitrogen tank The nitrogen pipeline at the output end and a number of closed nozzles arranged at the end of the nitrogen pipeline are equipped with detection devices in the protection area. There is a pre-action system on the pipeline, and a nitrogen generator is installed between the nitrogen tank and the liquid nitrogen tank; a controller is also included to control the opening and closing of each pipeline.

Further, the pre-action system includes a pre-action alarm valve and a signal valve arranged on the nitrogen delivery pipeline, the pre-action alarm valve is connected with a solenoid valve, and the solenoid valve is controlled by a controller.

Further, a first cut-off valve and a first check valve are arranged sequentially from one end of the nitrogen tank on the gas pipeline.

Further, a second check valve and a second shut-off valve are provided sequentially from one end of the liquid nitrogen tank on the nitrogen delivery pipeline, and the second check valve is located behind the signal valve.

Further, a transition pipeline is provided between the nitrogen tank and the nitrogen pipeline, one end of the transition pipeline communicates with the nitrogen pipeline, and the connection point is located between the second check valve and the second shut-off valve; The other end of the transfer line communicates with the input end of the nitrogen tank.

Further, a third shut-off valve is provided on the transfer pipeline.

Further, a circulation pipeline is provided between the nitrogen tank and the liquid nitrogen tank, and a third check valve is provided on the circulation pipeline.

Further, a first monitoring component is provided on the liquid nitrogen tank, and the first monitoring component includes a first pressure gauge and a first safety valve installed on the liquid nitrogen tank, and the first pressure gauge and the first safety valve controlled by the controller.

Further, a second monitoring component is provided on the nitrogen tank, and the second monitoring component includes a second pressure gauge and an outlet valve installed on the nitrogen tank.

Further, an exhaust device is also connected to the nitrogen tank, and the exhaust device includes an exhaust pipeline and an exhaust valve and an electric valve arranged on the exhaust pipeline, and the exhaust pipeline and the nitrogen tank The exhaust port is connected.

The positive effect of the present invention is:

The present invention can utilize phase nitrogen and liquid nitrogen to carry out fire extinguishing functions respectively, and the mutual conversion from nitrogen gas to liquid nitrogen can be realized by using a nitrogen generator, so as to ensure continuous supply of liquid nitrogen and realize recycling.

At the same time, the liquid nitrogen tank is combined with the pre-action system, and the liquid nitrogen is used as the main fire extinguishing agent to directly act on the protected area to improve the fire extinguishing efficiency, and at the same time, it can avoid the adverse effects of liquid nitrogen spraying on the protected area.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of the present invention.

In the attached picture,

11-liquid nitrogen tank;

12 - nitrogen generator;

13 - Nitrogen tank;

21 - detection device;

22 - outlet valve;

23 - the first pressure gauge;

24 - the first safety valve;

25 - second pressure gauge;

31 - pre-action alarm valve;

32 - solenoid valve;

33 - signal valve;

34 - the third cut-off valve;

35 - the second cut-off valve;

36 - the first cut-off valve;

37-stop valve;

38 - the third check valve;

39 - the second check valve;

40 - the first check valve;

41 - electric valve;

42 - exhaust valve;

51 - controller;

52-sound and light alarm;

61 - exhaust pipe;

62-nitrogen pipeline;

63 - gas pipeline;

64-open nozzle;

65-closed nozzle;

66-transfer pipeline.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authorized Specification. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

As shown in Figures 1 and 2, the present invention includes fire extinguishing components, nitrogen generating components, monitoring devices, preaction system components, exhaust components, control components and pipelines.

Described fire extinguishing assembly comprises liquid nitrogen tank 11 and nitrogen tank 13, is connected with gas delivery pipeline 63 at the output end of nitrogen tank 13, several open nozzles 64 at the end of gas delivery pipeline 63, is connected at the output end of liquid nitrogen tank 11. There is a nitrogen delivery pipeline 62, and several closed nozzles 65 are arranged at the end of the nitrogen delivery pipeline 62, and a detection device 21 is provided in the protection zone, and the open nozzle 64 and the closed nozzle 65 are both arranged in the protection zone Inside. A pre-action system is provided on the nitrogen delivery pipeline 62 , and a nitrogen generator 12 is provided between the nitrogen tank 13 and the liquid nitrogen tank 11 .

The nitrogen generating component is a nitrogen generator 12, which is movable, and transports the prepared liquid nitrogen to the liquid nitrogen tank 11, and the input end of the nitrogen generator 12 is connected to a nitrogen tank 13.

The monitoring device includes a plurality of detection devices 21, a first monitoring component and a second monitoring component. Each detection device 21 is correspondingly arranged at a corresponding position in the room, and is used for monitoring the fire situation in the room. The first monitoring component is installed on the liquid nitrogen tank 11 , and the second monitoring component is installed on the nitrogen tank 12 .

The first monitoring assembly includes a first pressure gauge 23 and a first safety valve 24 installed on the liquid nitrogen tank 11, the first pressure gauge 23 and the first safety valve 24 are controlled by a controller 51, and the second monitoring assembly includes an installation The second pressure gauge 25 and the gas outlet valve 22 on the nitrogen tank 13.

The pre-action system components include a pre-action alarm valve 31 , a signal valve 33 , and a solenoid valve 32 . The pre-action alarm valve 31 and the signal valve 33 are connected to the output end of the liquid nitrogen tank 11 , and the solenoid valve 32 is connected to the controller 51 .

The control assembly includes a controller 51 and an audible and visual alarm 52 . The controller 51 is connected with the first monitoring component for pressure regulation in the liquid nitrogen tank 11; connected with the second monitoring component for pressure regulation in the liquid nitrogen tank 11; connected with the preaction system component for Control the opening and closing of the pre-action system; it is connected with the nitrogen generator 12 to control its opening and closing and the conversion efficiency of liquid nitrogen. The sound and light alarm 52 is connected with the controller 51 for sending out fire signals. The first pressure gauge 23 , the first safety valve 24 , the second pressure gauge 25 and the outlet valve 22 are all controlled by the controller 51 .

The exhaust device includes an exhaust pipeline 61 and an exhaust valve 42 and an electric valve 41 arranged on the exhaust pipeline 61. The exhaust pipeline 61 communicates with the exhaust port of the nitrogen tank 13, and the controller 51 The opening and closing of the exhaust valve 42 and the electric valve 41 are controlled.

Further, the output end of the liquid nitrogen tank 11 is connected to the input end of the nitrogen gas tank 13, and a third check valve 38 is provided therebetween. The liquid nitrogen tank 11 is provided with a first monitoring component, and both the third check valve 38 and the first monitoring component are connected to the controller 51 . When the value of the first pressure gauge 23 in the first monitoring component is not within the set value range, the controller 51 controls the opening and closing of the nitrogen generator 12 and the opening and closing of the third check valve 38 .

The first pressure gauge 23 on the liquid nitrogen tank 11 monitors the pressure in the liquid nitrogen tank 11 in real time. When the pressure value is lower than the set range, it means that the amount of liquid nitrogen in the liquid nitrogen tank 11 is small, and the controller 51 controls the nitrogen generator 12 to start to replenish the liquid nitrogen tank 11 with liquid nitrogen. When the pressure value is higher than the set interval, it means that the amount of liquid nitrogen in the liquid nitrogen tank 11 is large, and the controller 51 controls the third check valve 38 to open so that the liquid nitrogen enters the nitrogen tank 13 .

Further, the nitrogen tank 13 is provided with an exhaust valve 42 connected to the controller. When the value of the second pressure gauge 25 in the second monitoring component exceeds the set value, the controller 51 controls the exhaust valve 42 to open.

Further, the output end of the nitrogen tank 13 is connected to the input end of the nitrogen generator 12, and a valve is arranged between them, and the controller 51 controls the opening and closing of the valve.

The pressure in the nitrogen tank 13 is monitored in real time by the second pressure gauge 25. When the pressure value exceeds the set range, the controller 51 controls the exhaust valve 42 to open to discharge excess nitrogen for pressure relief. When the pressure value is within the set interval, the controller 51 controls the exhaust valve to close. When the pressure value is lower than the set interval, the controller 51 controls the third check valve 38 to open, so that the liquid nitrogen in the liquid nitrogen tank 11 enters the nitrogen tank 13 to supplement nitrogen.

The nitrogen generator 12 can directly produce nitrogen from the air through a compressor, or can directly receive nitrogen from the nitrogen tank 13 to liquefy it into liquid nitrogen. Therefore, the mutual conversion of nitrogen to liquid nitrogen and liquid nitrogen to nitrogen is realized as a whole, and recycling is realized with higher efficiency.

Further, the controller 51 controls the opening and closing of the pre-action alarm valve 31 , the signal valve 33 and the solenoid valve 32 .

Further, the sound and light alarm 52 is used to send out sound and light alarm signals.

When the temperature in the protected area is too high or an open fire occurs, the detection device 21 starts to transmit the fire signal to the controller 51, and the controller 51 controls the sound and light alarm 52 to emit sound, light and other alarm signals. The acousto-optic alarm 52 is arranged in an obvious and convenient position for personnel to observe.

Further, the detection device is a temperature sensor and a light sensor.

The temperature sensor detects the temperature in the protected area, and the light sensor detects the light and open fire in the protected area.

Further, the nitrogen-generating component and the liquid nitrogen tank 11, the liquid nitrogen tank 11 and the nitrogen tank 13, and the liquid nitrogen and the nitrogen tank and other components of the system are all connected by low-temperature and high-pressure metal hoses.

During the normal state of the present invention, each valve is in closed state. When the nitrogen pressure in the nitrogen tank 13 is insufficient, the controller 51 controls the liquid nitrogen in the liquid nitrogen tank 11 to be delivered to the nitrogen tank 13, and the liquid nitrogen is converted into nitrogen for filling, so that the pressure in the nitrogen tank 13 reaches a set interval. When the nitrogen pressure in the nitrogen tank 13 is too high, the nitrogen in the nitrogen tank 13 can be transmitted to the nitrogen generator 12 first, and then the nitrogen is converted into liquid nitrogen by the nitrogen generator 12 and delivered to the liquid nitrogen tank 11 for replenishment. nitrogen. Since the liquid nitrogen tank 11 is provided with the first pressure gauge 23, when the pressure monitored by the first pressure gauge 23 also exceeds the set range, the controller 51 controls the exhaust valve 42 on the nitrogen tank 13 to open to release the pressure.

When a fire breaks out in the protected area, the corresponding detection device 21 detects a fire signal and sends the fire signal to the controller 51. After the controller 51 receives the fire signal, it controls the sound and light alarm 52 to send an alarm signal to remind the staff to There is a fire. On the other hand, open the nitrogen tank 13, open the first stop valve 36 and the first check valve 40, and spray nitrogen through the gas pipeline 63 and the open nozzle 65 to cool the protected area for the first time. At the same time, the controller 51 opens the second check valve 39, sends an instruction to the signal valve 33, drives the solenoid valve 32 to open the pre-action alarm valve 31, and the liquid nitrogen tank 11, under the control of the controller 51, sends liquid nitrogen through the input The nitrogen pipeline 62 is delivered to the front of the shut-off valve 35, waiting for the next signal. Nitrogen blowing and liquid nitrogen delivery are carried out simultaneously.

If the fire is under control at this time, the temperature in the protected area does not continue to rise or the detection device 21 false alarm occurs, the blasting beads of the closed nozzle 65 will not rupture at this time, and the controller 51 will not receive the secondary fire signal for a long time. The controller 51 will control the liquid nitrogen tank 11 to stop conveying liquid nitrogen and at the same time control the nitrogen gas tank 13 to stop blowing nitrogen. Close the first shut-off valve 36 and check the first return valve 40, and open the third shut-off valve 34 at the same time, convert the released liquid nitrogen into nitrogen and store it in the nitrogen tank 13, and supplement the nitrogen tank 13 with nitrogen.

If the fire is not effectively controlled and the temperature in the protected area continues to rise, the closed nozzle 65 blasting beads will rupture, and the controller 51 will immediately close the nitrogen tank 13 to continue spraying nitrogen after receiving the secondary fire signal, and close the first shut-off valve 36, The first check valve 40. At the same time, the second shut-off valve 35 is opened, so that the liquid nitrogen continues to enter the protected area through the nitrogen delivery pipeline 62, and is sprayed through the closed nozzle 65. Liquid nitrogen will permeate the protection area, that is, through the characteristics of liquid nitrogen, such as low temperature and heat absorption, to realize rapid fire extinguishing.

After the fire extinguishing is completed, the controller 51 controls the liquid nitrogen tank 11 to stop transporting liquid nitrogen. After the temperature drops to a certain level, that is, when the detection device 21 does not monitor the temperature to rise again, the controller 51 closes the pre-action alarm valve 32 and the signal valve 33. , the second check valve 39 and the second stop valve 35 .

Compared with the prior art, the present invention has the following advantages:

1. The present invention is due to the arrangement of a nitrogen tank and a nitrogen generator. The output end of the liquid nitrogen tank is connected to the input end of the nitrogen tank. When the nitrogen pressure in the nitrogen tank is insufficient, the controller will control the liquid nitrogen in the liquid nitrogen tank to be delivered to the nitrogen tank, and the liquid nitrogen will be converted into nitrogen for filling. When the nitrogen pressure in the nitrogen tank is too high, the controller controls the nitrogen generator to convert the nitrogen into liquid nitrogen and transport it to the liquid nitrogen tank for nitrogen supplementation or discharge directly. At the same time, the liquid nitrogen pressure in the liquid nitrogen tank can also be adjusted, so that liquid nitrogen and nitrogen gas can be converted to each other, ensuring the continuous supply of liquid nitrogen and nitrogen gas, and avoiding failure to extinguish the fire in time when a fire occurs.

2. The present invention is due to the setting of exhaust device. Under normal conditions, the exhaust assembly is closed. When the detection device sends out a fire signal, the controller controls the opening of the nitrogen tank and the liquid nitrogen tank. After the fire is under control, the released liquid nitrogen enters the nitrogen tank through the nitrogen pipeline. When the pressure in the nitrogen tank is too high, the exhaust assembly will be opened to reduce the pressure in the nitrogen tank in time to avoid accidents caused by excessive pressure.

3 The present invention is due to the provision of pre-action system components. After the detection device sends out a fire signal, the pipeline is filled with liquid nitrogen while the nitrogen gas is released to cool down. When the temperature rises again, the controller controls the valve of the liquid nitrogen spraying pipeline to open and release the liquid nitrogen to extinguish the fire, which is more efficient and improves fire extinguishing efficiency. When the temperature does not continue to rise and the fire is under control, the controller controls the valve of the gas transfer pipeline to open, and the released liquid nitrogen is transported to the nitrogen tank for nitrogen supplementation, so as to avoid the impact of excessive liquid nitrogen release on the environment and save resources.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the technical solutions, or equivalent replacements are made to some of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A liquid nitrogen fire extinguishing device based on a pre-action system, characterized in that it comprises a nitrogen tank (13), a liquid nitrogen tank (11), a gas pipeline (63) connected to the outlet of the nitrogen tank (13), arranged on Several open nozzles (64) at the end of the gas pipeline (63), a nitrogen pipeline (62) connected to the output of the liquid nitrogen tank (11), and several nozzles arranged at the end of the nitrogen pipeline (62) The closed nozzle (65) is provided with a detection device (21) in the protection zone, and the open nozzle (64) and the closed nozzle (65) are all arranged in the protection zone, on the nitrogen pipeline (62) A pre-action system is provided, and a nitrogen generator (12) is provided between the nitrogen tank (13) and the liquid nitrogen tank (11); a controller (51) is also included for controlling the opening and closing of each pipeline. 2. A kind of liquid nitrogen fire extinguishing device based on pre-action system according to claim 1, characterized in that said pre-action system includes a pre-action alarm valve (31) and signal The valve (33), the pre-action alarm valve (31) are connected with the solenoid valve (32), and the solenoid valve (32) is controlled by the controller (51). 3. A liquid nitrogen fire extinguishing device based on a pre-action system according to claim 1, characterized in that a first cut-off valve (36) is arranged sequentially from one end of the nitrogen tank (13) on the gas pipeline (63) and first check valve (40). 4. A liquid nitrogen fire extinguishing device based on a pre-action system according to claim 2, characterized in that a second check valve is arranged sequentially from one end of the liquid nitrogen tank (11) on the nitrogen delivery pipeline (62) (39) and a second stop valve (35), the second check valve (39) is located behind the signal valve (33). 5. A kind of liquid nitrogen fire extinguishing device based on preaction system according to claim 4, it is characterized in that a transfer pipeline (66) is provided between the nitrogen tank (13) and the nitrogen delivery pipeline (62), so One end of the transfer pipeline (66) communicates with the nitrogen delivery pipeline (62), and the connection point is located between the second check valve (39) and the second shut-off valve (35); the other end of the transfer pipeline (66) One end is communicated with the input end of nitrogen tank (13). 6. A liquid nitrogen fire extinguishing device based on a pre-action system according to claim 5, characterized in that a third shut-off valve (34) is provided on the transfer pipeline (66). 7. A kind of liquid nitrogen fire extinguishing device based on preaction system according to claim 1, it is characterized in that a circulation pipeline is provided between the nitrogen tank (13) and the liquid nitrogen tank (11), and a circulation pipeline is provided on the circulation pipeline. There is a third check valve (38). 8. A liquid nitrogen fire extinguishing device based on a preaction system according to claim 1, characterized in that a first monitoring component is provided on the liquid nitrogen tank (11), and the first monitoring component includes The first pressure gauge (23) and the first safety valve (24) on the tank (11), the first pressure gauge (23) and the first safety valve (24) are controlled by the controller (51). 9. A kind of liquid nitrogen fire extinguishing device based on preaction system according to claim 1 or 8, it is characterized in that a second monitoring component is provided on the nitrogen tank (13), and the second monitoring component includes The second pressure gauge (25) and air outlet valve (22) on the tank (13). 10. A kind of liquid nitrogen fire extinguishing device based on the preaction system according to claim 9, it is characterized in that an exhaust device is also connected to the nitrogen tank (13), and the exhaust device includes an exhaust pipeline (61) and the exhaust valve (42) and the electric valve (41) that are arranged on the exhaust pipeline (61), and the exhaust pipeline (61) communicates with the exhaust port of the nitrogen tank (13).

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