CN115957463A - Mobile liquid nitrogen fire extinguishing device for cable trench and application method thereof - Google Patents
Mobile liquid nitrogen fire extinguishing device for cable trench and application method thereof Download PDFInfo
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- CN115957463A CN115957463A CN202211624148.3A CN202211624148A CN115957463A CN 115957463 A CN115957463 A CN 115957463A CN 202211624148 A CN202211624148 A CN 202211624148A CN 115957463 A CN115957463 A CN 115957463A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 423
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 209
- 239000007788 liquid Substances 0.000 title claims abstract description 198
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000007789 gas Substances 0.000 claims abstract description 40
- 238000012544 monitoring process Methods 0.000 claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 230000001276 controlling effect Effects 0.000 claims abstract description 4
- 238000001802 infusion Methods 0.000 claims description 13
- 239000000779 smoke Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 7
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 8
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention discloses a mobile liquid nitrogen fire extinguishing device for a cable trench and a using method thereof, wherein the mobile liquid nitrogen fire extinguishing device comprises a liquid nitrogen tank, a controller and a monitoring component which is positioned in the cable trench and used for monitoring fire; the liquid conveying end on the liquid nitrogen tank is connected with the input end of the booster pump, the first exhaust port is connected with the gas storage tank through a gas conveying pipeline, and the liquid nitrogen tank is provided with a pressure regulating assembly for monitoring and regulating pressure; a liquid outlet of the booster pump is sequentially connected with the flowmeter and the safety valve, and liquid nitrogen is input into the cable trench through a liquid conveying pipeline; the gas transmission pipeline is provided with a first stop valve controlled by a controller; according to the invention, the nitrogen-making component is used for providing liquid nitrogen for the liquid nitrogen tank, the liquid nitrogen pipe is input into the cable trench by adding the pump, so that the unified implementation of nitrogen making, nitrogen storage and fire extinguishing is realized, the monitoring component is arranged in the cable trench, and the controller is used for controlling the power of the booster pump, so that the device is not only suitable for long-distance conveying and more resource saving, but also has pertinence in fire extinguishing, and avoids the waste of liquid nitrogen.
Description
Technical Field
The invention relates to the field of wire processing, in particular to a mobile liquid nitrogen fire extinguishing device for a cable trench and a using method thereof.
Background
The cable trench is an underground pipeline used for laying and replacing electric power or telecommunication cable facilities and is also an enclosure structure of the laid cable facilities; when the cable facilities in the cable trench work, heat is generated to increase the temperature, so that the cable trench needs to be subjected to fire-proof treatment;
some existing cable trench fire extinguishing modes have certain limitations, for example, in a dry powder fire extinguishing system, released micro solid powder can effectively obstruct flame combustion, but is difficult to clean after being sprayed, and certain interference exists on cable facilities in a cable trench; liquid nitrogen is widely developed in the fields of fire control, fire extinguishment and the like due to the advantages of no color, no odor, incombustibility, low temperature and the like;
liquid nitrogen is directly injected into a cable trench protection area, a large amount of liquid nitrogen is generally required to be injected in the fire extinguishing process, a preset system does not have nitrogen storage equipment and nitrogen making equipment, a liquid nitrogen tank car needs to be temporarily allocated, and continuous supply of the liquid nitrogen cannot be guaranteed; and the liquid nitrogen is conveyed for a long distance, so that the liquid nitrogen is basically in a gaseous state when entering a protection zone, and the cooling capacity is weakened; when liquid nitrogen and other fire extinguishing agents are mixed for use, due to the low temperature and the easy gasification and expansion properties of the liquid nitrogen, the other fire extinguishing agents can lose effectiveness, the reliability is poor, the real function cannot be played, and the fire prevention and extinguishing requirements of a cable trench are difficult to meet;
in addition, when a fire disaster occurs in the cable trench, the fire disaster source is usually caused instantly by a certain position, the existing fire extinguishing system cannot be pointed, and liquid nitrogen is usually directly injected into the cable trench, so that a great amount of waste of the liquid nitrogen is caused.
Disclosure of Invention
The invention aims to provide a mobile liquid nitrogen fire extinguishing device for a cable trench, which has a simple and compact structure, inputs liquid nitrogen into the cable trench, realizes the unified implementation of nitrogen making, nitrogen storage and nitrogen supply fire extinguishing, and ensures the sufficient supply and continuous fire extinguishing of the liquid nitrogen; and redundant liquid nitrogen is stored, so that the waste of the liquid nitrogen is avoided.
In order to achieve the purpose, the mobile liquid nitrogen fire extinguishing device for the cable trench comprises a liquid nitrogen tank, a controller and a monitoring component, wherein the liquid nitrogen tank is arranged on a mobile platform, and the monitoring component is positioned in the cable trench and used for monitoring fire;
the liquid conveying end on the liquid nitrogen tank is connected with the input end of the booster pump, the first exhaust port is connected with the gas storage tank through a gas conveying pipeline, and the liquid nitrogen tank is provided with a pressure regulating assembly for monitoring and regulating pressure; a liquid discharge port of the booster pump is sequentially connected with the flowmeter and the safety valve, and liquid nitrogen is input into the cable trench through a liquid conveying pipeline; the gas transmission pipeline is provided with a first stop valve controlled by a controller;
the nitrogen making component is arranged on the movable trolley and is connected with the input end of the liquid nitrogen tank;
the monitoring assembly transmits a fire monitoring signal to the controller, and the controller is connected with the booster pump and the safety valve and used for controlling the on-off of the booster pump and the safety valve.
Further, a pressure gauge and a pressure relief valve are arranged on the gas storage tank, and the output end of the gas storage tank is sequentially connected with the liquefier and the infusion pipeline;
and second stop valves controlled by the controller are arranged between the gas storage tank and the liquefier and between the liquefier and the infusion pipeline.
Further, the infusion pipeline comprises a main pipeline and an auxiliary pipeline which is connected with the main pipeline and is positioned in the cable trench;
the main pipeline is arranged along the length of the cable trench, and one end of the main pipeline is positioned outside the cable trench;
the auxiliary pipelines are firstly arranged along two sides of the cable trench and then arranged in parallel along the length of the cable trench, and a plurality of spray heads facing the inner side of the cable trench are arranged on the auxiliary pipelines.
Furthermore, the monitoring assemblies are multiple and are arranged along the length direction of the cable trench; each monitoring component comprises a smoke sensor, a temperature sensor, a photoelectric sensor and a position sensor;
a third stop valve controlled by a controller is arranged at the connecting position of the auxiliary pipeline and the main pipeline; the controller controls the power output of the booster pump.
Furthermore, a second exhaust port is arranged on the booster pump and connected with the gas storage tank.
The invention also aims to provide a using method of the mobile liquid nitrogen fire extinguishing device for the cable trench, liquid nitrogen is provided for a liquid nitrogen tank through a nitrogen making assembly, a liquid nitrogen pipe is input into the cable trench through an additional pump, the unified implementation of nitrogen making, nitrogen storage and nitrogen supply fire extinguishing is realized, a position, temperature sensing, photoelectric and smoke sensing sensor is arranged in the cable trench, and a controller controls the power of a booster pump, so that the mobile liquid nitrogen fire extinguishing device is not only suitable for long-distance conveying and more resource saving, but also has pertinence in fire extinguishing, and avoids the waste of liquid nitrogen;
a use method of a mobile liquid nitrogen fire extinguishing device for a cable trench specifically comprises the following steps:
a. under the normal state, the liquid nitrogen tank, the booster pump and valves on all pipelines are in a closed state; smoke sensors, temperature sensors and photoelectric sensors at various positions in the cable trench monitor the fire in the cable trench in real time;
b. when a fire disaster occurs in the cable duct, the position sensor close to the adjacent position of the fire disaster transmits the position of the fire disaster to the controller, the controller receives a fire disaster signal and the position signal and then controls the booster pump to start, the safety valve to open and the third stop valve on the auxiliary pipeline close to the fire source to open, liquid nitrogen in the liquid nitrogen tank is discharged from the liquid conveying end, pressurized by the booster pump, enters the main pipeline from the liquid discharge port of the liquid nitrogen tank through the flow meter and the safety valve, enters the auxiliary pipeline close to the fire source and is sprayed out from the corresponding spray head to extinguish the liquid nitrogen;
when the fire position is far away from the input port of the infusion pipeline, the controller controls the booster pump to increase the output power, and at the moment, the flow speed of liquid nitrogen passing through the booster pump is accelerated, so that the liquid nitrogen is quickly transmitted to the fire source position for extinguishing; when the fire position is close to the input port of the infusion pipeline, the controller appropriately controls and increases the output power of the pump, and liquid nitrogen is transmitted to the fire source position to extinguish the fire;
meanwhile, the nitrogen-making assembly is connected with the input end of the liquid nitrogen tank, and the prepared liquid nitrogen is supplemented for the liquid nitrogen tank;
c. when the pressure adjusting assembly on the liquid nitrogen tank detects that the pressure in the tank body is higher than the set interval, the first stop valve on the gas transmission pipeline is opened, and redundant liquid nitrogen in the liquid nitrogen tank is discharged from the first exhaust port of the liquid nitrogen tank and gasified into nitrogen gas to be stored in the gas storage tank, so that the pressure in the liquid nitrogen tank is restored to the normal set interval;
the stored nitrogen can be also conveyed to the main pipeline through the liquefier;
d. when the smoke sensor, the temperature sensor and the photoelectric sensor monitor that the fire in the cable duct is controlled, the liquid nitrogen tank, the booster pump and valves on all pipelines are in a closed state.
Compared with the prior art, the mobile liquid nitrogen fire extinguishing device for the cable trench and the using method thereof have the advantages that the nitrogen making assembly is connected with the liquid nitrogen tank, and the liquid nitrogen tank conveys the liquid nitrogen into the cable trench through the booster pump, so that the whole structure is simple and compact, the liquid nitrogen is input into the cable trench, the unified implementation of nitrogen making, nitrogen storage and nitrogen supply fire extinguishing is realized, and the sufficient supply of the liquid nitrogen and the continuous fire extinguishing are ensured; the first exhaust port on the liquid nitrogen tank is connected with the gas storage tank through a gas transmission pipeline, so that redundant liquid nitrogen is stored, and resource waste caused by the fact that the liquid nitrogen is exhausted due to overlarge pressure in the liquid nitrogen tank is avoided;
because the liquid conveying pipeline comprises the main pipeline and the auxiliary pipeline, the main pipeline is arranged along the length of the cable trench, and the auxiliary pipelines are firstly arranged along two sides of the cable trench and then arranged in parallel along the length of the cable trench, liquid nitrogen can be conveyed to different positions of the cable trench, the liquid nitrogen is conveniently dispersed, and the phenomenon that the liquid nitrogen is accumulated at one position to cause untimely fire extinguishment is avoided;
because a plurality of monitoring subassemblies are arranged along cable pit length direction, every monitoring subassembly still includes position sensor, the power take off of controller control booster pump, therefore position sensor will monitor the position of conflagration, when the conflagration position is far away from the infusion pipeline input port, the controller adds pump increase output, the velocity of flow accelerates behind the booster pump liquid nitrogen this moment, when near, the controller appropriately controls the increase pump and reduces output, not only realize quick pertinence and put out a fire, high efficiency, avoid a large amount of wastes of liquid nitrogen, and be applicable to through position response fire source apart from the position, the output of liquid nitrogen adjustment booster pump, make to put out a fire more timely, it is effective.
Drawings
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is a schematic diagram of the booster pump output connections of the present invention;
FIG. 3 is a schematic cross-sectional view of the interior of a cable trench in accordance with the present invention;
1. a nitrogen making component 2, a liquid nitrogen tank 21, a pressure regulating component 22, a transfusion end 23 and a first exhaust port;
3. the device comprises a controller 31, a monitoring component 41, a main pipeline 42, a secondary pipeline 43, a spray head 5, a booster pump 51, a liquid outlet 52, a flow meter 53, a safety valve 54, a second exhaust port 55, a pressure gauge 56, a gas storage tank 57 and a liquefier;
61. first stop valve, 62, second stop valve, 63, third stop valve, 7, gas transmission pipeline.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, 2 and 3, the mobile liquid nitrogen fire extinguishing device for the cable trench comprises a liquid nitrogen tank 2 arranged on a mobile platform, a controller 3 and a monitoring component 31 which is positioned in the cable trench and used for fire monitoring;
the liquid conveying end 22 on the liquid nitrogen tank 2 is connected with the input end of the booster pump 5, the first exhaust port 23 is connected with the gas storage tank 56 through a gas conveying pipeline 71, the liquid nitrogen tank 2 is provided with a pressure regulating assembly 21 for monitoring and regulating pressure, a liquid outlet 51 of the booster pump 5 is sequentially connected with the flow meter 52 and the safety valve 53, and liquid nitrogen is conveyed into the cable trench through the liquid conveying pipeline; the gas transmission pipeline 71 is provided with a first stop valve 61 controlled by the controller 3;
the nitrogen making component 1 is arranged on the movable trolley and is connected with the input end of the liquid nitrogen tank 2;
the monitoring component 31 transmits a fire monitoring signal to the controller 3, and the controller 3 is connected with the booster pump 5 and the safety valve 53 and is used for controlling the on-off of the booster pump and the safety valve;
specifically, a certain amount of liquid nitrogen is stored in the liquid nitrogen tank 2 in advance, and the liquid nitrogen tank 2 is installed on a mobile platform or is fixedly positioned at the outer side of the cable trench, and the pressure adjusting assembly 21 on the liquid nitrogen tank 2 can comprise an adjusting valve for adjusting the pressure interval of the liquid nitrogen tank 2 and a pressure gauge for monitoring the pressure in the liquid nitrogen tank 2;
the controller 3 can adopt an industrial PLC, belongs to the existing conventional control part and can receive and send remote signals;
the booster pump 5 boosts the liquid nitrogen delivered from the liquid nitrogen tank 2, so that the liquid nitrogen can conveniently enter the cable trench from the liquid conveying pipeline;
in a normal state, the liquid nitrogen tank 2 and valve components on each pipeline are in a closed state, and the monitoring assembly 31 feeds back the conditions in the cable trench to the controller 3 in real time;
when the monitoring component 31 monitors that a fire disaster occurs in the cable trench, the controller 3 receives a signal to control the liquid nitrogen tank 2 to be opened, liquid nitrogen in the liquid nitrogen tank 2 is discharged from the liquid conveying end 22, is pressurized by the booster pump 5, then enters a liquid conveying pipeline from the liquid outlet 51 through the flow meter 52 and the safety valve 53, and is input into the cable trench to extinguish the liquid nitrogen;
meanwhile, the controller 3 can inform corresponding personnel of a signal through a wireless component, or the mobile trolley is loaded with the nitrogen making component 1 to be in butt joint with the liquid nitrogen tank 2, namely the nitrogen making component 1 comprises an air compressor and a nitrogen making machine connected with the output end of the air compressor, the output end of the nitrogen making machine is connected with the liquid nitrogen tank 2, preferentially, a metal hose can be adopted, and a quick connector is adopted at the connecting position;
when the pressure adjusting assembly 21 on the liquid nitrogen tank 2 detects that the internal pressure is smaller than a set interval, the pressure adjusting assembly can be automatically connected with the nitrogen making assembly 1, for example, the controller 3 controls a fourth stop valve on the input end of the liquid nitrogen tank 2 to be opened, the nitrogen making assembly 1 extracts surrounding air, filters and compresses the air, and conveys the air to a nitrogen making machine for processing, and prepared liquid nitrogen is conveyed to the liquid nitrogen tank 2;
when the pressure adjusting assembly on the liquid nitrogen tank 2 detects that the internal pressure is higher than the set interval, the first exhaust port 23 on the liquid nitrogen tank 2 is opened, and the redundant liquid nitrogen is exhausted, namely the controller 3 controls the first stop valve 61 on the gas transmission pipeline 71 to be opened, so that the pressure in the liquid nitrogen tank 2 is recovered to the normal set interval, and the nitrogen converted by the liquid nitrogen is stored in the gas storage tank 56; therefore, the device provides liquid nitrogen for the liquid nitrogen tank 2 through the nitrogen making assembly 1, and the liquid nitrogen tank 2 inputs the liquid nitrogen into the cable trench through adding a pump, so that the unified implementation of nitrogen making, nitrogen storage and nitrogen supply fire extinguishing is realized, and the sufficient supply and continuous fire extinguishing of the liquid nitrogen are ensured; the excess liquid nitrogen is additionally stored for later use.
Further, a pressure gauge 55 and a pressure relief valve are arranged on the gas storage tank 56, and the output end of the gas storage tank is sequentially connected with the liquefier 57 and the infusion pipeline;
when the pressure gauge 55 on the gas storage tank 56 monitors that the internal gas pressure is too high, the pressure relief valve is opened to discharge redundant nitrogen;
when the monitoring component 31 monitors that a fire disaster occurs in the cable trench, the controller 3 controls the second stop valve 62 to be opened, nitrogen in the gas storage tank 56 is liquefied through the liquefier 57 and then is introduced into a liquid conveying pipeline;
the mode that the gas storage tank 56 stores nitrogen and liquefies the nitrogen into liquid nitrogen for fire extinguishing is adopted, so that the waste of the nitrogen is avoided, and the nitrogen converted from the redundant liquid nitrogen in the liquid nitrogen tank 2 is directly stored, so that the purity is higher, and the energy consumption is lower; in addition, when fire is extinguished inside the cable trench, the nitrogen gas in the gas tank 56 may be preferably used.
Further, the liquid conveying pipeline comprises a main pipeline 41 and an auxiliary pipeline 42 which is connected with the main pipeline 41 and is positioned in the cable trench;
the main pipeline 41 is arranged along the length of the cable trench, and one end of the main pipeline is positioned outside the cable trench;
the auxiliary pipeline 42 is communicated with the main pipeline 41, is firstly arranged along two sides of the cable trench and then is arranged in parallel along the length of the cable trench, and a plurality of spray heads 43 facing the inner side of the cable trench are arranged on the auxiliary pipeline 42;
specifically, main pipeline 41 is used for the main part to carry, and auxiliary line 42 is used for carrying the liquid nitrogen to the different positions of cable pit, conveniently disperses the liquid nitrogen, avoids it to pile up in one place and causes the untimely of putting out a fire.
Further, the monitoring assemblies 31 are multiple and are arranged along the length direction of the cable trench; each monitoring component 31 comprises a smoke sensor, a temperature sensor, a photoelectric sensor and a position sensor;
a third stop valve 63 controlled by the controller 3 is arranged at the connecting position of the auxiliary pipeline 42 and the main pipeline 41; the controller 3 controls the power output of the booster pump 5;
specifically, the smoke sensor, the temperature sensor and the photoelectric sensor are used for monitoring fire in the cable trench and feeding monitoring information back to the controller 3, and the controller 3 receives corresponding signals, controls the booster pump 5 to start, opens the safety valve 53 and conveys liquid nitrogen into the cable trench;
in addition, the position sensor monitors the position of a fire, when the position of the fire is far away from the input port of the liquid conveying pipeline, the controller 3 controls the booster pump to increase the output power, at the moment, the flow rate of liquid nitrogen passing through the booster pump 5 is accelerated, the liquid nitrogen is rapidly and remotely conveyed to the position close to the fire extinguishing position, the controller 3 opens the third stop valve 63 close to the position, and the liquid nitrogen is conveyed from the main pipeline 41 to the auxiliary pipeline 42 close to a fire source, so that rapid targeted fire extinguishing is realized, the efficiency is higher, and a large amount of waste of the liquid nitrogen is avoided;
similarly, when the fire is located closer to the input of the infusion line, the controller 3 appropriately controls the booster pump to reduce the output power and opens the third shut-off valve 63 adjacent to the fire.
Further, a second exhaust port 54 is arranged on the booster pump 5, and the second exhaust port 54 is connected with an air storage tank 56;
the nitrogen gas heated and gasified in the pipeline is discharged through the gas outlet of the booster pump 5, so that the fire extinguishing effect is better and more efficient.
When the mobile liquid nitrogen fire extinguishing device for the cable trench is used, the liquid nitrogen tank 2 and valve components on each pipeline are in a closed state in a normal state; smoke sensors, temperature sensors and photoelectric sensors at various positions in the cable trench monitor the fire in the cable trench in real time;
when a fire disaster occurs in the cable trench, the position sensor close to the fire disaster transmits the position of the fire disaster to the controller 3, after receiving a fire disaster signal and the position signal, the controller 3 controls the booster pump 5 to be started, the safety valve 53 to be opened, and the third stop valve 63 on the auxiliary pipeline 42 close to the fire source to be opened, so that the liquid nitrogen in the liquid nitrogen tank 2 is discharged from the liquid conveying end 22, pressurized by the booster pump 5, enters the main pipeline 41 from the liquid discharge port 51 of the liquid nitrogen tank, enters the auxiliary pipeline 42 close to the fire source through the flow meter 52 and the safety valve 53, and is sprayed out from the corresponding spray head 43 to extinguish the liquid nitrogen;
when the fire position is far away from the input port of the infusion pipeline, the controller 3 controls the booster pump to increase the output power, and the flow speed of liquid nitrogen passing through the booster pump 5 is accelerated, so that the liquid nitrogen is quickly transmitted to the fire source position for extinguishing fire in a long distance; when the fire position is close to the input port of the infusion pipeline, the controller 3 appropriately controls and increases the output power of the pump, and liquid nitrogen is transmitted to the fire source position to extinguish the fire;
meanwhile, the nitrogen making assembly 1 is connected with the input end of the liquid nitrogen tank 2, and the prepared liquid nitrogen supplements the liquid nitrogen tank 2;
when the pressure adjusting assembly 21 on the liquid nitrogen tank 2 detects that the pressure in the tank body is higher than the set interval, the first stop valve 61 on the gas transmission pipeline 71 is opened, and redundant liquid nitrogen in the liquid nitrogen tank 2 is discharged from the first exhaust port 23 and gasified into nitrogen gas to be stored in the gas storage tank 56, so that the pressure in the liquid nitrogen tank 2 is recovered to the normal set interval;
stored nitrogen may also be fed to main conduit 41 via liquefier 57.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Claims (6)
1. A mobile liquid nitrogen fire extinguishing device for a cable trench comprises a liquid nitrogen tank (2) arranged on a mobile platform, a controller (3) and a monitoring assembly (31) which is positioned in the cable trench and used for fire monitoring;
it is characterized in that the preparation method is characterized in that,
a liquid conveying end (22) on the liquid nitrogen tank (2) is connected with the input end of the booster pump (5), a first exhaust port (23) is connected with the gas storage tank (56) through a gas conveying pipeline (71), and the liquid nitrogen tank (2) is provided with a pressure regulating assembly (21) for monitoring and regulating pressure; a liquid outlet (51) of the booster pump (5) is sequentially connected with a flowmeter (52) and a safety valve (53), and liquid nitrogen is input into the cable trench through a liquid conveying pipeline; a first stop valve (61) controlled by the controller (3) is arranged on the gas transmission pipeline (71);
the nitrogen making component (1) is arranged on the movable trolley and is connected with the input end of the liquid nitrogen tank (2);
the monitoring assembly (31) transmits a fire monitoring signal to the controller (3), and the controller (3) is connected with the booster pump (5) and the safety valve (53) and used for controlling the on-off of the booster pump and the safety valve.
2. The mobile liquid nitrogen fire extinguishing device for the cable trench according to claim 1, wherein a pressure gauge (55) and a pressure relief valve are arranged on the gas storage tank (56), and an output end of the gas storage tank is sequentially connected with a liquefier (57) and a liquid conveying pipeline;
second stop valves (62) controlled by the controller (3) are arranged between the gas storage tank (56) and the liquefier (57) and between the liquefier (57) and the liquid conveying pipeline.
3. The mobile liquid nitrogen fire extinguishing device for the cable trench according to claim 2, wherein the liquid feeding pipe comprises a main pipe (41), a secondary pipe (42) connected with the main pipe (41) and located in the cable trench;
the main pipeline (41) is arranged along the length of the cable trench, and one end of the main pipeline is positioned outside the cable trench;
the auxiliary pipelines (42) are firstly arranged along two sides of the cable trench and then are arranged in parallel along the length of the cable trench, and a plurality of spray heads (43) facing the inner side of the cable trench are arranged on the auxiliary pipelines (42).
4. The mobile liquid nitrogen fire extinguishing device for the cable trench as claimed in claim 3, wherein the monitoring component (31) is a plurality of and arranged along the length direction of the cable trench; each monitoring component (31) comprises a smoke sensor, a temperature sensor, a photoelectric sensor and a position sensor;
a third stop valve (63) controlled by the controller (3) is arranged at the connecting position of the auxiliary pipeline (42) and the main pipeline (41); the controller (3) controls the power output of the booster pump (5).
5. The mobile liquid nitrogen fire extinguishing device for the cable trench as claimed in claim 3, wherein the booster pump (5) is provided with a second exhaust port (54), and the second exhaust port (54) is connected with an air storage tank (56).
6. The use method of the mobile liquid nitrogen fire extinguishing device for the cable trench according to claim 4 is characterized by comprising the following steps:
a. under the normal state, the liquid nitrogen tank (2), the booster pump (5) and valves on all pipelines are all in a closed state; smoke sensors, temperature sensors and photoelectric sensors at various positions in the cable trench monitor the fire in the cable trench in real time;
b. when a fire disaster occurs in the cable duct, a position sensor close to the adjacent position of the fire disaster transmits the position of the fire disaster to a controller (3), the controller (3) receives a fire disaster signal and a position signal and then controls a booster pump (5) to start, a safety valve (53) to open and a third stop valve (63) on a secondary pipeline (42) close to the fire disaster to open, liquid nitrogen in a liquid nitrogen tank (2) is discharged from a liquid conveying end (22), is pressurized by the booster pump (5), then enters a main pipeline (41) from a liquid discharge port (51) of the liquid nitrogen tank through a flow meter (52) and the safety valve (53), enters the secondary pipeline (42) close to the fire disaster and is sprayed out from a corresponding spray head (43) to extinguish the liquid nitrogen;
when the fire position is far away from the input port of the infusion pipeline, the controller (3) controls the booster pump to increase the output power, and at the moment, the flow speed of liquid nitrogen is accelerated after passing through the booster pump (5), so that the liquid nitrogen is quickly transmitted to the fire source position for extinguishing; when the fire position is close to the input port of the infusion pipeline, the controller (3) appropriately controls and increases the output power of the pump, and liquid nitrogen is transmitted to the fire source position to extinguish the fire;
meanwhile, the nitrogen-making component (1) is connected with the input end of the liquid nitrogen tank (2), and the prepared liquid nitrogen supplements the liquid nitrogen tank (2);
c. when a pressure adjusting assembly (21) on the liquid nitrogen tank (2) detects that the internal pressure of the tank body is higher than a set interval, a first stop valve (61) on a gas transmission pipeline (71) is opened, redundant liquid nitrogen in the liquid nitrogen tank (2) is discharged from a first exhaust port (23) of the liquid nitrogen tank and gasified into nitrogen gas to be stored in a gas storage tank (56), so that the pressure in the liquid nitrogen tank (2) is recovered to a normal set interval;
the stored nitrogen can likewise be fed to the main conduit (41) by means of a liquefier (57);
d. when the smoke sensor, the temperature sensor and the photoelectric sensor monitor that the fire in the cable trench is controlled, the liquid nitrogen tank (2), the booster pump (5) and valves on all pipelines are in a closed state.
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| CN208552938U (en) * | 2018-02-01 | 2019-03-01 | 天津城建大学 | A kind of Household independent Simple water spraying fire extinguisher |
| CN111803826A (en) * | 2020-07-16 | 2020-10-23 | 中国矿业大学 | Movable liquid nitrogen fire extinguishing system for comprehensive pipe gallery and fire extinguishing method thereof |
| CN111803831A (en) * | 2020-07-23 | 2020-10-23 | 中国矿业大学 | Fire prevention and control system and control method for lithium ion battery prefabricated cabin |
| WO2022016765A1 (en) * | 2020-07-23 | 2022-01-27 | 中国矿业大学 | Fire prevention and control system for lithium ion battery prefabricated container and control method therefor |
| CN114762764A (en) * | 2021-01-11 | 2022-07-19 | 广东锐捷安全技术股份有限公司 | New energy vehicle power battery compartment fire extinguishing system and fire extinguishing method thereof |
| CN115414620A (en) * | 2022-08-15 | 2022-12-02 | 国网河北省电力有限公司电力科学研究院 | Liquid nitrogen extinguishing device based on preaction system |
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