Flue fire extinguishing system and ship

Abstract

The present invention discloses a flue fire extinguishing system and a ship, comprising an electrical control box, a flame sensor, a pressure water tank, a pressure gauge and a water mist nozzle; the water mist nozzle and the flame sensor are both arranged in the flue, the pressure water tank is provided with a liquid outlet pipe connected to the water mist nozzle, and a solenoid valve is installed on the liquid outlet pipe; the pressure water tank is provided with a liquid inlet pipe, and a stop valve is provided on the liquid inlet pipe, and the pressure gauge is used to detect the pressure of the pressure water tank in real time; the flame sensor and the solenoid valve are both connected to the electrical control box, and when the flame sensor senses a flame, the flame sensor transmits a signal to the electrical control box, and the electrical control box controls the solenoid valve to open. By adopting a water mist fire extinguishing system to replace the existing carbon dioxide fire extinguishing system, not only can the refilling cost and the fire extinguishing maintenance cost be reduced, but also the problem of needing to dock to refill after the carbon dioxide is released can be avoided, so that the flue is always under effective protection.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguishing equipment, and in particular to a flue fire extinguishing system and a ship. Background Art

[0002] The flue of existing ships generally adopts a carbon dioxide fire extinguishing system. However, it is very inconvenient to refill the carbon dioxide after use, and it must be refilled by professionals at the dock. Because carbon dioxide can only be refilled at the dock, there is a certain period of no protection measures between the release of carbon dioxide and the refilling of carbon dioxide, which seriously threatens the safety of the ship. Summary of the invention

[0003] One purpose of an embodiment of the present invention is to provide a flue fire extinguishing system and a ship, which can solve the technical problem of inconvenient recharging of existing fire extinguishing systems.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A flue fire extinguishing system comprises an electrical control box, a flame sensor, a pressure water tank, a pressure gauge and a water mist nozzle; the water mist nozzle and the flame sensor are both arranged in the flue, the pressure water tank is provided with a liquid outlet pipe connected to the water mist nozzle, and a solenoid valve is installed on the liquid outlet pipe; the pressure water tank is provided with a liquid inlet pipe, and a stop valve is provided on the liquid inlet pipe, and the pressure gauge is used to detect the pressure of the pressure water tank in real time; the flame sensor and the solenoid valve are both connected to the electrical control box, and when the flame sensor senses a flame, the flame sensor transmits a signal to the electrical control box, and the electrical control box controls the solenoid valve to open.

[0006] Optionally, it also includes an ice melting device, which includes a heat exchanger, a fan and a heating sleeve; the heating sleeve is sleeved on the outer circumference of the liquid outlet pipe, and a heating chamber is formed between the inner wall of the heating sleeve and the outer wall of the liquid outlet pipe, and the fan is connected to the heating chamber through a heat transfer pipe; the heat release structure of the heat exchanger is arranged in the heat transfer pipe, and the heat absorption structure of the heat exchanger is arranged in the flue, which is used for heat exchange between the gas in the heat transfer pipe and the gas in the flue.

[0007] Optionally, an insulation layer is provided on the outer wall of the heat transfer pipeline and the outer wall of the heating sleeve.

[0008] Optionally, there are multiple heat exchangers, which are distributed along the length of the flue.

[0009] Optionally, the heat release structure of the heat exchanger includes an outer ring and an inner plate; the outer wall of the outer ring fits against the inner wall of the heat transfer pipe, the outer ring and the inner plate are connected by at least two connecting plates, and a passage for gas to pass through is formed between two adjacent connecting plates.

[0010] Optionally, a back-pump is further included; the back-pump is connected to the liquid outlet pipe through a connecting pipe, and the connection between the connecting pipe and the liquid outlet pipe is located between the solenoid valve and the water mist nozzle.

[0011] Optionally, a filter is provided on the liquid outlet pipe, and the filter is located between the solenoid valve and the connecting pipe.

[0012] Optionally, the filter is provided with a drain pipe, the drain pipe is arranged on a side of the filter screen of the filter close to the solenoid valve, and the drain pipe is provided with a detachable sealing cover.

[0013] Optionally, the pressure water tank comprises a plurality of pressure tanks arranged in parallel, and the pressure water tank is equipped with a safety valve.

[0014] The beneficial effects of the present invention are:

[0015] The flue fire extinguishing system of the present invention and the ship including the same adopt a water mist fire extinguishing system to replace the existing carbon dioxide fire extinguishing system. On the one hand, it can reduce the fire extinguishing cost and eliminate the safety threat of carbon dioxide to the ship and the crew. On the other hand, the pressure water tank is easy to refill, eliminating the problem of empty bottle period after carbon dioxide fire extinguishing, so that the ship can be continuously protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0017] Figure 1 A schematic diagram of the structure of a flue fire extinguishing system provided by an embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of another flue fire extinguishing system provided by an embodiment of the present invention;

[0019] Figure 3 An enlarged structural diagram of another ice melting device of a flue fire extinguishing system provided by an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the connection between the heat release structure and the heat transfer pipeline of a heat exchanger of another flue fire extinguishing system provided by an embodiment of the present invention;

[0021] Figure 5 A schematic structural diagram of a filter of a flue fire extinguishing system provided in an embodiment of the present invention.

[0022] In the figure: 100, electrical control box; 110, alarm; 120, line connected to the cab; 200, flame sensor; 300, pressure water tank; 310, liquid outlet pipe; 311, solenoid valve; 320, liquid inlet pipe; 321, stop valve; 330, safety valve; 400, pressure gauge; 500, water mist nozzle; 600, ice melting device; 610, heat exchanger; 611, outer ring; 612, inner plate; 613, connecting plate; 614, port; 620, fan; 621, heat transfer pipe; 630, heating sleeve; 631, heating chamber; 632, exhaust pipe; 700, back pump; 710, connecting pipe; 800, filter; 810, filter screen; 820, sewage pipe; 821, sealing cover; 900, flue. DETAILED DESCRIPTION

[0023] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] The flue of existing ships generally adopts a carbon dioxide fire extinguishing system. However, it is very inconvenient to refill the carbon dioxide after use, and it must be refilled by professionals at the dock. Because the carbon dioxide must be refilled at the dock, there is a certain period of no protection measures between the release of carbon dioxide and the refilling of carbon dioxide, which seriously threatens the safety of the ship. In addition, the present invention also found that the carbon dioxide fire extinguishing system still has the following problems: high refilling cost and high maintenance cost; there is a risk of carbon dioxide gas leakage, which threatens the life safety of the crew; after the carbon dioxide is released, the crew must wait until the carbon dioxide concentration drops to a safe level before conducting a fire extinguishing inspection.

[0027] See also Figure 1 to Figure 5 The embodiment of the present invention provides a flue fire extinguishing system, including an electrical control box 100, a flame sensor 200, a pressure water tank 300, a pressure gauge 400 and a water mist nozzle 500; the water mist nozzle 500 and the flame sensor 200 are both arranged in the flue 900, the pressure water tank 300 is provided with a liquid outlet pipe 310 connected to the water mist nozzle 500, and a solenoid valve 311 is installed on the liquid outlet pipe 310; the pressure water tank 300 is provided with a liquid inlet pipe 320, the liquid inlet pipe 320 is used to connect the pressure water tank 300 with the water supply system, the liquid inlet pipe 320 is provided with a stop valve 321, and the pressure gauge 400 is used to detect the pressure of the pressure water tank 300 in real time; the flame sensor 200 and the solenoid valve 311 are both connected to the electrical control box 100, when the flame sensor 200 senses a flame, the flame sensor 200 transmits a signal to the electrical control box 100, and the electrical control box 100 controls the solenoid valve 311 to open.

[0028] The present invention has the following effects: (1) when a fire occurs, the flame sensor 200 senses the flame and transmits a signal to the electrical control box 100, and the electrical controller controls the solenoid valve 311 to open, so that the pressure water tank 300 can infuse liquid along the liquid outlet pipe 310 and extinguish the smoke duct 900 through the water mist nozzle 500, thereby achieving rapid fire extinguishing, which is conducive to reducing the occurrence of safety accidents; after the pressure water tank 300 is used, when the pressure of the pressure water tank 300 drops to the preset value of the pressure gauge 400, the stop valve 321 can be opened to replenish water for the pressure water tank 300 in time through the water supply system, effectively solving the existing fire extinguishing system. (1) The water mist fire extinguishing system replaces the existing carbon dioxide fire extinguishing system, which not only reduces the cost of refilling and the cost of fire extinguishing maintenance, but also avoids the problem of having to dock to refill after carbon dioxide is released. The water mist fire extinguishing system can replenish water in time, so that the flue 900 is always under effective protection; (2) The water mist fire extinguishing system replaces the existing carbon dioxide fire extinguishing system, which not only reduces the cost of refilling and the cost of fire extinguishing maintenance, but also avoids the problem of having to dock to refill after carbon dioxide is released. The water mist fire extinguishing system can replenish water in time, so that the flue 900 is always under effective protection; (3) In addition, since the carbon dioxide fire extinguishing system also has the risk of carbon dioxide gas leakage, it is easy to threaten the life safety of the crew, and after carbon dioxide is released, the crew must wait until the carbon dioxide concentration drops to a safe level before they can conduct fire extinguishing inspections. The use of a water mist fire extinguishing system can avoid the above problems. After the fire is extinguished, the crew can conduct an inspection immediately without waiting for the carbon dioxide concentration to drop to a safe level.

[0029] It should be noted that the pressure water tank 300 is a water storage tank that can output a stable water source to the pipeline, which plays a role in balancing the water volume and pressure. While ensuring sufficient water volume, it also ensures that the output water has a suitable pressure. The pressure water tank 300 can be a pressure tank; the water supply system of the pressure water tank 300 is equipped with a high-pressure pump, which can be used to pump fresh water stored on the ship to the pressure water tank 300, and can also be used to pump seawater to the pressure water tank 300. Therefore, the pressure water tank 300 can be replenished with water at any time during navigation without docking; the present invention is mainly used for extinguishing fires in kitchen flues on ships.

[0030] In one embodiment, the water supply system of the ship includes a fresh water tank, and the pressure water tank 300 is connected to the fresh water tank through a liquid inlet pipe 320. When water replenishment is needed, the fresh water tank delivers fresh water to the pressure water tank 300 through a high-pressure pump. Compared with using seawater to replenish water, using a fresh water tank to replenish water for the pressure water tank 300 does not require adding a pipeline for inletting seawater outside the ship, and the amount of water used in the fire extinguishing system using the principle of high-pressure atomization fire extinguishing is relatively small, which will not affect the normal use of fresh water for the ship; at the same time, using a fresh water tank to replenish water for the pressure water tank 300 not only saves the cost of the seawater inlet pipe, but also saves the maintenance cost caused by corrosion of the seawater inlet pipe. Therefore, using a fresh water tank to replenish water for the pressure water tank 300 is more cost-effective and more practical. In addition, the fresh water tank and the pressure water tank 300 can also be arranged in the same cabin of the ship, the length of the liquid inlet pipe 320 can also be shortened, the cost of laying the pipe is reduced, and it is also convenient to maintain the pressure water tank 300.

[0031] As an optional embodiment, the pressure gauge 400 is connected to a reminder device. When the pressure of the pressure water tank 300 is lower than the preset value of the pressure gauge 400, the pressure gauge 400 can either make a sound through the reminder device to remind the staff so that the staff can manually open the stop valve 321 to replenish water for the pressure water tank 300, or the pressure gauge 400 can be connected to the electrical control box 100. When the electrical control box 100 receives a signal that the pressure of the pressure water tank 300 is too low, it controls the stop valve 321 to open, thereby automatically replenishing water for the pressure water tank 300.

[0032] In one embodiment, see Figure 2-3, and also includes an ice melting device 600, which includes a heat exchanger 610, a fan 620 and a heating sleeve 630; the heating sleeve 630 is sleeved on the outer periphery of the liquid outlet pipe 310, and a heating chamber 631 is formed between the inner wall of the heating sleeve 630 and the outer wall of the liquid outlet pipe 310, and the fan 620 is connected to the heating chamber 631 through the heat transfer pipe 621; the heat release structure of the heat exchanger 610 is arranged in the heat transfer pipe 621, and the heat absorption structure of the heat exchanger 610 is arranged in the flue 900, which is used for heat exchange between the gas in the heat transfer pipe 621 and the gas in the flue 900. In a cold environment, the nozzles and pipes of the water mist fire extinguishing system (especially pipes with residual water, such as pipes that transport water from bottom to top during fire extinguishing) are prone to ice, which may block the pipes or nozzles, causing the water mist fire extinguishing system to fail in a cold environment. In the water mist fire extinguishing system of the present invention, the water mist nozzle 500 is located in the flue 900, and the flue gas with heat in the flue 900 makes it difficult for the water mist nozzle 500 located in the flue 900 to freeze. In addition, the embodiment of the present invention is also provided with a heating sleeve 630 on the periphery of the liquid outlet pipe 310, and the heat carried by the gas discharged from the flue 900 is transferred to the wind generated in the heat transfer pipe 621 by the fan 620 through the heat exchanger 610, and the wind carrying heat enters the heating chamber 631 in the heating sleeve 630 through the heat transfer pipe 621, and then the heat output by the flue 900 is reasonably used to heat the liquid outlet pipe 310, which can help the liquid outlet pipe 310 in the icy environment to melt the ice inside, thereby ensuring that the water mist fire extinguishing system can still be used normally in a cold environment, so that the flue 900 is always under effective protection, which is conducive to reducing the occurrence of safety accidents.

[0033] It should be noted that the fan 620 can be set outside the flue 900, which not only meets the ice melting demand of the liquid outlet pipe 310, but also the wind blown by the fan 620 will not enter the flue 900, and the fan will not interfere with the normal smoke exhaust of the flue 900; the heat absorption structure and the heat release structure of the heat exchanger can be made of metal materials with good thermal conductivity, so that the flue gas in the flue 900 can exchange heat with the wind flowing in the heat transfer pipe 621.

[0034] When the kitchen space is compact and limited, the pressure water tank 300 can be set in the storage room of the ship, so as to reduce the occupation of the kitchen space by the fire extinguishing system and ensure the daily use experience of the kitchen. In the case where the pressure water tank 300 is a certain distance away from the kitchen, the internal equipment of the kitchen limits the pipeline layout path, etc., the length of the heat transfer pipe 621 and the heating sleeve 630 may be relatively long. In one embodiment, the outer wall of the heat transfer pipe 621 and the outer wall of the heating sleeve 630 are provided with an insulation layer. When the length of the heat transfer pipe 621 and the heating sleeve 630 is relatively long, in order to reduce the loss of the output hot air during the transmission process, the insulation and insulation effect of the insulation layer can be used to reduce the heat transferred to the outside by the hot air, so that the heat carried by the hot air is more involved in the heating operation of the liquid outlet pipe 310, which is more conducive to helping the liquid outlet pipe 310 in the cold ice environment to melt the ice inside. In addition, in order to ensure the normal discharge of the gas in the heating chamber 631, an exhaust pipe 632 for gas discharge and penetrating the insulation layer is provided at the end of the heating sleeve 630.

[0035] See also Figure 2-3 There are multiple heat exchangers 610, which are distributed along the length direction of the flue 900. The multiple heat exchangers 610 arranged along the length direction of the flue 900 can absorb the heat of the exhaust gas in the flue 900 in sequence, and can maximize the use of the heat carried by the exhaust gas in the flue 900 as much as possible, so that the exhaust gas in the flue 900 can exchange heat with the ice in the liquid outlet pipe 310, thereby promoting the melting of ice in the liquid outlet pipe 310, and ensuring that the water mist fire extinguishing system can still be used normally in a cold environment.

[0036] See also Figure 2 to Figure 4 The heat release structure of the heat exchanger 610 includes an outer ring 611 and an inner plate 612; the outer wall of the outer ring 611 is in contact with the inner wall of the heat transfer pipe 621, and the outer ring 611 and the inner plate 612 are connected by at least two connecting plates 613, and a through hole 614 for gas to pass through is formed between two adjacent connecting plates 613. The heat release structure of the heat exchanger 610 is formed by the outer ring 611, the inner plate 612 and the connecting plate 613. While ensuring that the gas generated by the fan 620 can flow through the opening 614, a large area of ​​direct contact between the gas and the heat release structure of the heat exchanger 610 can be achieved, which is beneficial to improving the heat exchange efficiency between the gas generated by the fan 620 and the heat exchanger 610, so that the heat absorbed by the heat exchanger 610 from the gas in the flue 900 can be transferred to the gas generated by the fan 620 with relatively little loss, and the gas generated by the fan 620 transfers the heat to the ice in the liquid outlet pipe 310 along the heating chamber 631 to promote the melting of the ice, thereby avoiding blockage of the liquid outlet pipe 310 and affecting the normal use of the water mist fire extinguishing system.

[0037] As an optional embodiment, the openings 614 of the heat release structures of two adjacent heat exchangers 610 can be staggered, which can appropriately extend the flow path and residence time of the gas generated by the fan 620 in the heat transfer pipe 621, and ensure that the gas generated by the fan 620 can fully exchange heat with the heat release structure of the heat exchanger 610; in addition, in order to ensure that the heat carried by the gas generated by the fan 620 can be smoothly transferred to the ice in the liquid outlet pipe 310, a guide member that can increase the heat exchange area can also be provided on the heat absorption structure of the heat exchanger 610 and the outer wall of the liquid outlet pipe 310.

[0038] In one embodiment, see Figure 2 , and also includes a back-pump pump 700; the back-pump pump 700 is connected to the liquid outlet pipe 310 through a connecting pipe 710, and the connection between the connecting pipe 710 and the liquid outlet pipe 310 is located between the solenoid valve 311 and the water mist nozzle 500. The inventor found that the heat carried by the gas discharged from the flue 900 can help melt the ice in the liquid outlet pipe 310, but there will still be many ice particles or small ice cubes in the liquid outlet pipe 310 after melting, and the ice particles or small ice cubes still have the risk of blocking the water mist nozzle 500. The back-pump pump 700 can quickly extract the remaining ice particles or small ice cubes after melting from the liquid outlet pipe 310, which is helpful to assist the ice melting device 600 to clean the ice in the liquid outlet pipe 310, and the deicing efficiency and deicing effect of the liquid outlet pipe 310 are better, thereby ensuring that the water mist fire extinguishing system can still be used normally in a cold environment, so that the flue 900 is always under effective protection, which is helpful to reduce the occurrence of safety accidents.

[0039] See also Figure 2 , a filter 800 is provided on the liquid outlet pipe 310, and the filter 800 is located between the solenoid valve 311 and the connecting pipe 710. The filter 800 can be a filter with a filtering accuracy of 0.05mm. The setting of the filter 800 can filter out most of the solid matter carried in the water transported by the pressure water tank 300, thereby effectively avoiding the blockage of the liquid outlet pipe 310 and the water mist nozzle 500 caused by the accumulation of solid matter carried by the water transported by the pressure water tank 300. In addition, the filter 800 is arranged between the solenoid valve 311 and the connecting pipe 710, which can also reasonably avoid the solid matter carried by the water from affecting the suction and cleaning of the liquid outlet pipe 310 by the back pump 700, which is conducive to ensuring the normal operation of the entire fire extinguishing system.

[0040] See also Figure 5The filter 800 is provided with a drain pipe 820, which is arranged on the side of the filter screen 810 of the filter 800 close to the electromagnetic valve 311, and the drain pipe 820 is provided with a detachable sealing cover 821. The filter screen 810 of the filter 800 can block most of the solid matter from passing through, and the setting of the drain pipe 820 can leave a space so that the blocked solid matter will be precipitated and collected at the drain pipe 820, effectively avoiding the situation that the blocked solid matter accumulates too much and blocks the filter 800, and when the solid matter collected by the drain pipe 820 reaches a certain amount, the electromagnetic valve 311 can be closed, and then the sealing cover 821 can be opened to discharge the solid matter from the drain pipe 820, so that the service life of the filter 800 can be appropriately extended.

[0041] See also Figure 1 The pressure water tank 300 includes a plurality of pressure tanks arranged in parallel, and the pressure water tank 300 is equipped with a safety valve 330. The pressure tanks arranged in parallel together as the pressure water tank 300 can ensure that there is sufficient water source to extinguish the smoke duct 900, and the pressure gauge 400 can be used to detect the pressure of the pressure water tank 300 in real time. When the pressure of the pressure water tank 300 is too low, the water can be added to the pressure water tank 300 by opening the stop valve 321. When the pressure of the pressure water tank 300 is too high, the pressure can be released in time through the safety valve 330, ensuring that the pressure range of the pressure water tank 300 is always within a safe and appropriate range, so that the smoke duct 900 is always under effective protection.

[0042] The present invention also provides a ship, see Figure 1-2 , including the above-mentioned flue fire extinguishing system, by adopting a water mist fire extinguishing system instead of the existing carbon dioxide fire extinguishing system, on the one hand, it can reduce the fire extinguishing cost and eliminate the safety threat of carbon dioxide to the ship and the crew. On the other hand, the pressure water tank 300 is easy to refill, eliminating the problem of empty bottle period after carbon dioxide fire extinguishing, so that the ship can be continuously protected.

[0043] Please continue reading Figure 1-2 , an alarm 110 may also be provided, the electrical control box 100 is connected to the alarm 110, when the flame sensor 200 senses the flame and sends a signal to the electrical control box 100, the electrical control box 100 controls the alarm 110 to start and sound an alarm to remind the crew of the fire in the flue 900, and the electrical control box 100 may also be connected to the cab through a line (see Figure 1 The line 120 connected to the cab in the figure can send an alarm signal to the cab.

[0044] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0046] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0047] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A flue fire extinguishing system, characterized in that: It comprises an electrical control box (100), a flame sensor (200), a pressure water tank (300), a pressure gauge (400) and a water mist nozzle (500); The water mist nozzle (500) and the flame sensor (200) are both arranged in the flue (900); the pressure water tank (300) is provided with a liquid outlet pipe (310) in communication with the water mist nozzle (500); and a solenoid valve (311) is installed on the liquid outlet pipe (310); The pressure water tank (300) is provided with a liquid inlet pipeline (320), the liquid inlet pipeline (320) is provided with a stop valve (321), and the pressure gauge (400) is used to detect the pressure of the pressure water tank (300) in real time; The flame sensor (200) and the electromagnetic valve (311) are both connected to the electrical control box (100); when the flame sensor (200) senses a flame, the flame sensor (200) transmits a signal to the electrical control box (100), and the electrical control box (100) controls the electromagnetic valve (311) to open; Also included is an ice melting device (600), wherein the ice melting device (600) includes a heat exchanger (610), a fan (620) and a heating sleeve (630); The heating sleeve (630) is sleeved on the outer circumference of the liquid outlet pipe (310), and a heating chamber (631) is formed between the inner wall of the heating sleeve (630) and the outer wall of the liquid outlet pipe (310), and the fan (620) is connected to the heating chamber (631) via a heat transfer pipe (621); The heat release structure of the heat exchanger (610) is arranged in the heat transfer pipeline (621), and the heat absorption structure of the heat exchanger (610) is arranged in the flue (500), so as to perform heat exchange between the gas in the heat transfer pipeline (621) and the gas in the flue (500).

2. The flue fire extinguishing system according to claim 1, characterized in that: A thermal insulation layer is provided on the outer wall of the heat transfer pipe (621) and the outer wall of the heating sleeve (630).

3. The flue fire extinguishing system according to claim 1, characterized in that: There are multiple heat exchangers (610) distributed along the length direction of the flue (500).

4. The flue fire extinguishing system according to claim 1, characterized in that: The heat release structure of the heat exchanger (610) comprises an outer circular ring (611) and an inner circular plate (612); The outer wall of the outer circular ring (611) is in contact with the inner wall of the heat transfer pipe (621); the outer circular ring (611) and the inner circular plate (612) are connected via at least two connecting plates (613); and a through hole (614) for gas to pass through is formed between two adjacent connecting plates (613).

5. The flue fire extinguishing system according to any one of claims 1 to 4, characterized in that: Also includes a back pump (700); The back-pump pump (700) is connected to the liquid outlet pipe (310) via a connecting pipe (710), and the connection between the connecting pipe (710) and the liquid outlet pipe (310) is located between the solenoid valve (311) and the water mist nozzle (500).

6. The flue fire extinguishing system according to claim 5, characterized in that: The liquid outlet pipe (310) is provided with a filter (800), and the filter (800) is located between the solenoid valve (311) and the connecting pipe (710).

7. The flue fire extinguishing system according to claim 6, characterized in that: The filter (800) is provided with a sewage discharge pipe (820), and the sewage discharge pipe (820) is arranged on a side of the filter screen (810) of the filter (800) close to the solenoid valve (311), and the sewage discharge pipe (820) is provided with a detachable sealing cover (821).

8. The flue fire extinguishing system according to claim 1, characterized in that: The pressure water tank (300) comprises a plurality of pressure tanks arranged in parallel, and the pressure water tank (300) is provided with a safety valve (330).

9. A ship, characterized in that: A flue fire extinguishing system comprising any one of claims 1 to 8.

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