Fire fighting water system and working method thereof

Abstract

The invention discloses a fire-fighting water system and a working method thereof. The fire-fighting water system comprises a fire-fighting water cabin, a water supply pipeline, a first siphon drainage mechanism and a drainage pipeline, the water supply pipeline is connected between the fire-fighting water cabin and a cabin of the nuclear power ship and provides fire-fighting water for the cabin; the first siphon drainage mechanism is arranged on the ground of a cabin corridor, the drainage pipeline is connected between the first siphon drainage mechanism and the fire-fighting water cabin, and fire-fighting water on the ground of the cabin enters the drainage pipeline under the siphon action of the first siphon drainage mechanism and flows back to the fire-fighting water cabin through the drainage pipeline. The siphon drainage mechanism and the drainage pipeline are connected with the fire-fighting water cabin, and a fire-fighting water circulation loop is formed between the fire-fighting water cabin and the cabin, so that fire-fighting water is recycled, the fire-fighting water quantity required by fire extinguishment is met, the volume of the fire-fighting water cabin is reduced, the load occupied by the fire-fighting water cabin is reduced, and the fire-fighting water cabin is convenient to use. Load can be vacated for other essential and important nuclear power equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power fire water supply, and in particular to a fire water system and a working method thereof. Background Art

[0002] At present, the design basis of the fire water system of the primary circuit compartment of nuclear power ships refers to the relevant regulations and standards of large-scale nuclear power onshore reactors, mainly the "Nuclear Power Plant Design Safety Regulations" (HAF102-2016), "Nuclear Power Plant Fire and Explosion Protection Design" (HAD102.11-2019) and "Nuclear Power Plant Fire Protection Design Code" (GB / T22158-2021) and other regulations and standards. The design idea is to move the fire protection design results of large-scale land-based reactors such as Hualong One and CPR1000 to the ship as a whole. However, the large-scale land-based reactors have a huge demand for fire water, which will make the already narrow hull space more compact and increase the useless load of the hull.

[0003] Considering the high cost of nuclear power equipment, if seawater is used as fire-fighting water in the primary circuit compartment, the problem of seawater corrosion on the equipment cannot be ignored, so the fire-fighting design of the primary circuit compartment of nuclear power ships requires the use of fresh water. The effective volume of fresh water storage is not less than the amount of water required by the "Nuclear Power Plant Fire Protection Design Code" (GB / T22158-2021) for a fire extinguishing duration of 2 hours, and the amount of water reaches more than 1,000 cubic meters. The water storage on board is huge, and this design idea is correct for the fire safety of nuclear power ships. However, the fire-fighting water stored in the primary circuit compartment occupies a huge useless load on the hull. If a certain design method can be used to reduce the amount of fire-fighting water in the primary circuit compartment of a nuclear power ship, and the load occupied by the fire-fighting water can be vacated and transferred to other important equipment that is indispensable to nuclear power, it will be better for the overall safety and economy of the nuclear power ship. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a fire water system and a working method thereof which are used in a nuclear power ship and can reduce the load of a fire water tank.

[0005] The technical solution adopted by the present invention to solve the technical problem is: to provide a fire water system for a nuclear power ship, the fire water system comprising at least one fire water tank, a water supply pipeline, at least one first siphon drainage mechanism and a drainage pipeline;

[0006] The water supply pipeline is connected between the fire water tank and the cabin of the nuclear power ship to provide fire water to the cabin;

[0007] The first siphon drainage mechanism is arranged on the floor of the cabin corridor, and the drainage pipeline is connected between the first siphon drainage mechanism and the fire water tank. The fire water sprayed to the cabin floor flows to the cabin corridor, enters the drainage pipeline under the siphon action of the first siphon drainage mechanism, and flows back to the fire water tank through the drainage pipeline.

[0008] In some embodiments, the water supply pipeline includes a main water supply pipeline connected to the fire water tank at one end, a fire water pump arranged on the main water supply pipeline, and a plurality of water supply branches connected to the other end of the main water supply pipeline;

[0009] The water supply branch is extended and arranged in the cabin.

[0010] In some embodiments, the fire water system further comprises a sprinkler pipe and / or a fire hydrant disposed in the cabin, and the water supply branch is connected to the sprinkler pipe and / or the fire hydrant.

[0011] In some embodiments, the first siphon drainage mechanism includes a first siphon rainwater bucket and a first filter element disposed above the first siphon rainwater bucket.

[0012] In some embodiments, the first filter element is a cast iron grate or a filter mesh.

[0013] In some embodiments, the fire water system also includes a water hole arranged on the isolation wall between the cabin and the cabin corridor, and the water hole connects the cabin and the cabin corridor to guide the fire water in the cabin to the cabin corridor.

[0014] In some embodiments, the fire water system further includes a second siphon drainage mechanism disposed at the staircase entrance of the floor where the cabin is located, for discharging the fire water flowing through the staircase entrance;

[0015] The second siphon drainage mechanism is connected to the drainage pipeline, discharges the fire water into the drainage pipeline through the siphon effect, and returns to the fire water tank through the drainage pipeline.

[0016] In some embodiments, the second siphon drainage mechanism includes a second siphon rainwater bucket and a second filter element disposed above the second siphon rainwater bucket.

[0017] In some embodiments, the nuclear power ship includes multiple layers of cabins arranged from bottom to top, and the height of the fire water tank is ≤ the height of the first layer of cabins.

[0018] In some embodiments, the fire water system further includes a fire submersible pump and a pressure-boosting pipe.

[0019] A sump is provided in the cabin on the first floor, and the fire water sprayed into the cabin on the first floor flows into the sump. The fire submersible pump is arranged in the sump, and the pressure-boosting pipe is connected between the fire submersible pump and the fire water tank.

[0020] The first siphon drainage mechanism on the floor of the cabin corridor on the second floor is connected to the sump through a drainage pipe, so as to drain the fire water in the cabin corridor on the second floor to the sump, and then transport it back to the fire water tank through the fire submersible pump and the pressure-boosting pipe.

[0021] The present invention also provides a working method of a fire water system, comprising the following steps:

[0022] When a fire occurs in a cabin of a nuclear power ship, the fire water in the fire water tank is transported to the cabin where the fire occurs through the water supply pipeline for spraying and extinguishing the fire;

[0023] The fire water sprayed onto the floor of the cabin flows to the cabin corridor, enters the drainage pipeline under the siphon effect of the first siphon drainage mechanism, and flows back to the fire water tank through the drainage pipeline.

[0024] In some embodiments, the working method of the fire water system further includes the following steps:

[0025] The fire water that flows to the cabin corridor and is not sucked in by the first siphon drainage mechanism is sucked into the drainage pipe by the second siphon drainage mechanism at the stair entrance when it flows to the stair entrance, and flows back to the fire water tank through the drainage pipe.

[0026] The beneficial effects of the present invention are as follows: the fire water tank is connected through the siphon drainage mechanism and the drainage pipe, a fire water circulation loop is formed between the fire water tank and the cabin, the recycling of fire water is realized, the fire water volume required for fire extinguishing is met, and it is also beneficial to reduce the volume of the fire water tank and reduce the load occupied by the fire water tank, which can free up the load for other indispensable important equipment of nuclear power. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0028] Figure 1 It is a schematic diagram of the longitudinal cross-sectional structure of a fire water system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0030] like Figure 1As shown, a fire water system according to an embodiment of the present invention is used in a nuclear power ship, and includes at least one fire water tank 10 , a water supply pipeline 20 , at least one first siphon drainage mechanism 30 and a drainage pipeline 40 .

[0031] The water supply pipeline 20 is connected between the fire water tank 10 and the cabin 100 of the nuclear power ship to provide fire water for the cabin 100. The first siphon drainage mechanism 30 is arranged on the floor of the cabin corridor 110, and the drainage pipeline 40 is connected between the first siphon drainage mechanism 30 and the fire water tank 10. The fire water sprayed to the floor of the cabin 100 flows to the cabin corridor 110, enters the drainage pipeline 40 under the siphon effect of the first siphon drainage mechanism 30, and flows back to the fire water tank 10 through the drainage pipeline 40, so as to realize the recycling of fire water.

[0032] Fresh water is used for fire fighting to avoid corrosion problems on equipment caused by seawater.

[0033] In the present invention, the volume of the fire water tank 10 can be reduced, that is, the volume of the fire water tank 10 is set to be smaller than the volume of the fire water tank in the land nuclear power plant, thereby reducing the load of the fire water tank 10 on the nuclear power ship, so that the load saved from the fire water tank 10 can be transferred to other indispensable important equipment of nuclear power.

[0034] The water volume of the fire water tank 10 is stored in accordance with the minimum volume of fire fresh water required by Article 3.0.8 of the General Specifications for Fire Protection Facilities (GB55036-2022). The effective water volume of a fire water tank 10 is not less than 100m 3 Storage.

[0035] Compared with the volume setting of the fire water tank in the land nuclear power plant, the volume of the fire water tank 10 can be 1 / 12 to 1 / 8 of the conventional volume of the fire water tank in the land nuclear power plant. For example, for a single fire water tank in the land nuclear power plant with a volume of 1200m 3 The volume of a single fire water tank 10 in the present invention can be 100m 3 ~150m 3 In this regard, the extra weight reduction quota can be used for other important equipment that is essential for nuclear power, thereby improving the overall safety and economy of nuclear power ships.

[0036] In some embodiments, two fire water tanks 10 are provided, and the two fire water tanks 10 serve as a primary and a backup respectively.

[0037] The water supply pipeline 20 is used to deliver fire water from the fire water tank 10 to the cabin 100. The water supply pipeline 20 may further include a main water supply pipeline 21, a fire water pump 22 and a plurality of water supply branches 23. One end of the main water supply pipeline 21 is connected to the fire water tank 10, and the other end is extended toward the cabin 100. The fire water pump 22 is arranged on the main water supply pipeline 21 to provide power for the delivery of fire water. A plurality of water supply branches 23 are connected to the other end of the main water supply pipeline 21 and are respectively extended and arranged in the cabin 100. Each cabin 100 is arranged with at least one water supply branch 23, and the water supply branch 23 delivers the fire water branch of the main water supply pipeline 21 to each cabin 100.

[0038] The fire water pump 22 is preferably a vertical single-stage single-suction marine fire pump.

[0039] A sprinkler pipe and / or a fire hydrant are provided in the cabin 100, and the water supply branch 23 enters the cabin 100 and is connected to the sprinkler pipe and / or the fire hydrant. The firefighting water transported by the water supply branch 23 can be sprayed into the cabin 100 through the sprinkler pipe and / or the fire hydrant, and used for fire extinguishing when a fire occurs.

[0040] As required, the fire water system of the present invention further includes a sprinkler pipe and / or a fire hydrant disposed in the cabin 100 .

[0041] The first siphon drainage mechanism 30 is disposed on the floor of the cabin corridor 110 . After the firefighting water in the cabin 100 flows out to the cabin corridor 110 , it is discharged back to the firefighting water tank 10 through the first siphon drainage mechanism 30 .

[0042] In order to facilitate the discharge of fire-fighting water in the cabin 100 to the cabin corridor 110, a water hole 130 is provided on the isolation wall 120 between the cabin 100 and the cabin corridor 110. The water hole 130 is located at the bottom of the isolation wall 120, close to the ground, connecting the cabin 100 and the cabin corridor 110, and guiding the fire-fighting water in the cabin 100 to the cabin corridor 110, so that the fire-fighting water passes through the water hole 130 to the cabin corridor 110, and then flows to the first siphon drainage mechanism 30.

[0043] There are preferably no less than two water holes 130 on the isolation wall 120 between each cabin 100 and the cabin corridor 110.

[0044] Specifically, the first siphon drainage mechanism 30 includes a first siphon rainwater bucket 31 and a first filter 32 disposed above the first siphon rainwater bucket 31. The first filter 32 covers the inlet end of the first siphon rainwater bucket 31 and is used to filter the incoming fire water and intercept debris, blocky dirt, etc. in the fire water. The siphon rainwater bucket is different from an ordinary drainage floor drain. It can isolate the air above the siphon rainwater bucket outside the siphon rainwater bucket while draining water. By utilizing the drainage height difference, the drainage pipeline 40 forms a full flow, and the drainage volume is huge, which can quickly guide the fire drainage to the fire water tank 10.

[0045] The first filter element 32 may be, but is not limited to, a cast iron grate or a filter mesh.

[0046] In order to prevent the fire water from flowing to the bottom floor through the stairwell and being difficult to be discharged back to the fire water tank 10 through siphon, the fire water system further includes a second siphon drainage mechanism (not shown) provided at the stair entrance of the floor where the cabin 100 is located, for discharging the fire water flowing through the stair entrance. The second siphon drainage mechanism is connected to the drainage pipeline 40, and discharges the fire water discharged by siphon into the drainage pipeline 40, and returns to the fire water tank 10 through the drainage pipeline 40.

[0047] The second siphon drainage mechanism may include a second siphon rainwater bucket and a second filter element disposed above the second siphon rainwater bucket. The structure and principle of the second siphon drainage mechanism are the same as those of the first siphon drainage mechanism 30 .

[0048] Further, in some embodiments, the nuclear power ship includes multiple layers of cabins 100 arranged from bottom to top, and each layer has a plurality of cabins 100. The height of the fire water tank 10 is set not higher than the height of the first layer of cabins 100, that is, the highest height of the fire water tank 10 is preferably equivalent to the height of the first layer of cabins 100. Taking the cabin 100 layer height of 3m as an example, the highest height of the fire water tank 10 is 3m. The fire water of the second layer and above cabins 100 can be discharged back to the fire water tank 10 through the first siphon drainage mechanism 30.

[0049] Specifically, there is a height difference between the first siphon drainage mechanism 30 and the fire water tank 10 , and the height difference is preferably 3 m or more, so that the siphon drainage effect is good, allowing the fire water to directly flow back to the fire water tank 10 through the first siphon drainage mechanism 30 and the drainage pipeline 40 .

[0050] Since the first siphon drainage mechanism 30 on the cabin corridor 110 on the third floor and above has a sufficient height difference with the fire water tank 10, the fire water of the cabins 100 on the third floor and above flows back to the fire water tank 10 through the first siphon drainage mechanism 30 and the drainage pipeline 40 of the cabin corridor 110. The fire water of the cabins 100 on the first and second floors can be pressure-replenished by a fire submersible pump and the like and then flow back to the fire water tank 10. In this regard, the fire water system also includes a fire submersible pump 60 and a pressure-replenishing pipeline 61.

[0051] like Figure 1 As shown in FIG. 1 , a sump 101 is provided in the cabin 100 of the first floor, and the fire water sprayed into the cabin 100 of the first floor flows into the sump 101. The fire submersible pump 60 is provided in the sump 101, and the pressure boosting pipe 61 is connected between the fire submersible pump 60 and the fire water tank 10. In this way, the fire water accumulated in the sump 101 can be sucked by the fire submersible pump 60 and returned to the fire water tank 10 through the pressure boosting pipe 61.

[0052] The power supply reliability of the fire submersible pump 60 is consistent with that of the fire water pump 22, and the discharge volume is not less than the rated flow of the fire water pump 22. The effective volume of the sump 101 is not less than 2m 3 .

[0053] Since the first siphon drainage mechanism 30 of the second-floor cabin corridor 110 does not have a sufficient height difference with the fire water tank 10, it is difficult for the first siphon drainage mechanism 30 to directly discharge the fire water of the second-floor cabin 100 back to the fire water tank 10 through the siphon effect. Therefore, the first siphon drainage mechanism 30 of the second-floor cabin corridor 110 is connected to the sump 101 through the drainage pipe 301, and the fire water of the second-floor cabin corridor 110 is drained to the sump 101, and then transported back to the fire water tank 10 through the fire submersible pump 60 and the pressure compensation pipe 61.

[0054] In some embodiments, when the fire-fighting water in the third-floor and above cabins 100 is not completely siphoned away by the first siphon drainage mechanism 30 of the cabin corridor 110, the fire-fighting water that has not been drained away can not only be siphoned away by the second siphon drainage mechanism at the entrance of the stairs, but can also flow to the first-floor cabin 100 through the stairs, be collected in the sump 101, and finally flow back to the fire-fighting water tank 10 through the fire-fighting submersible pump 60 and the pressure-boosting pipe 61.

[0055] refer to Figure 1 The working method of the fire water system of one embodiment of the present invention comprises the following steps:

[0056] S1. When a fire occurs in any cabin 100 of a nuclear power ship, the fire water in the fire water tank 10 is transported to the cabin 100 where the fire occurs through the water supply pipeline 20 for spraying and extinguishing the fire.

[0057] S2. The fire water sprayed onto the floor of the cabin 100 flows to the cabin corridor 110, enters the drainage pipe 40 under the siphon effect of the first siphon drainage mechanism 30, and flows back to the fire water tank 10 through the drainage pipe 40.

[0058] like Figure 1The cabin 100 shown has multiple layers in the longitudinal direction. When a fire occurs in the cabin 100 located on the third floor or above, after the fire is extinguished by fire water, the fire water flows to the cabin corridor 110 through the water tunnel 130, and then is siphoned into the drainage pipe 40 by the first siphon drainage mechanism 30 on the floor of the cabin corridor 110, and then flows back to the fire water tank 10 through the drainage pipe 40. The fire water that flows to the cabin corridor 110 and is not sucked in by the first siphon drainage mechanism 30 is sucked into the drainage pipe 40 by the second siphon drainage mechanism at the staircase entrance when it flows to the staircase entrance, and then flows back to the fire water tank 10 through the drainage pipe 40.

[0059] When a fire occurs in the cabin 100 located on the first floor, after the fire is extinguished by fire water, the fire water accumulates in the sump 101 and is sucked and transported back to the fire water tank 10 by the fire submersible pump 60 in the sump 101.

[0060] When a fire occurs in the cabin 100 on the second floor, after the fire is extinguished with fire water, the fire water flows through the water hole 130 to the cabin corridor 110, and is then siphoned into the drainage pipe 301 by the first siphon drainage mechanism 30 on the floor of the cabin corridor 110, and enters the sump 101 on the bottom floor along the drainage pipe, and is sucked back to the fire water tank 10 by the fire submersible pump 60 in the sump 101.

[0061] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fire water system for a nuclear power ship, characterized in that: The fire water system comprises at least one fire water tank, a water supply pipeline, at least one first siphon drainage mechanism and a drainage pipeline; The water supply pipeline is connected between the fire water tank and the cabin of the nuclear power ship to provide fire water to the cabin; The first siphon drainage mechanism is arranged on the floor of the cabin corridor, and the drainage pipeline is connected between the first siphon drainage mechanism and the fire water tank. The fire water sprayed to the cabin floor flows to the cabin corridor, enters the drainage pipeline under the siphon action of the first siphon drainage mechanism, and flows back to the fire water tank through the drainage pipeline.

2. The fire water system according to claim 1, characterized in that: The water supply pipeline includes a main water supply pipeline connected to the fire water tank at one end, a fire water pump arranged on the main water supply pipeline, and a plurality of water supply branches connected to the other end of the main water supply pipeline; The water supply branch is extended and arranged in the cabin.

3. The fire water system according to claim 2, characterized in that: The fire water system also includes a sprinkler pipe and / or a fire hydrant arranged in the cabin, and the water supply branch is connected to the sprinkler pipe and / or the fire hydrant.

4. The fire water system according to claim 1, characterized in that: The first siphon drainage mechanism includes a first siphon rainwater bucket and a first filter element arranged above the first siphon rainwater bucket.

5. The fire water system according to claim 4, characterized in that: The first filter element is a cast iron grate or a filter mesh.

6. The fire water system according to claim 1, characterized in that: The fire water system also includes a water hole arranged on the isolation wall between the cabin and the cabin corridor, and the water hole connects the cabin and the cabin corridor to guide the fire water flow in the cabin to the cabin corridor.

7. The fire water system according to any one of claims 1 to 6, characterized in that: The fire water system also includes a second siphon drainage mechanism disposed at the staircase entrance of the floor where the cabin is located, for discharging the fire water flowing to the staircase entrance; The second siphon drainage mechanism is connected to the drainage pipeline, discharges the fire water into the drainage pipeline through the siphon effect, and returns to the fire water tank through the drainage pipeline.

8. The fire water system according to claim 7, characterized in that: The second siphon drainage mechanism includes a second siphon rainwater bucket and a second filter element arranged above the second siphon rainwater bucket.

9. The fire water system according to any one of claims 1 to 6, characterized in that: The nuclear power ship includes multiple layers of cabins arranged from bottom to top, and the height of the fire water tank is ≤ the height of the cabin of the first layer.

10. The fire water system according to claim 9, characterized in that: The fire water system also includes a fire submersible pump and a pressure boosting pipeline; A sump is provided in the cabin of the first floor, and the fire water sprayed into the cabin of the first floor flows into the sump. The fire submersible pump is arranged in the sump, and the pressure-boosting pipe is connected between the fire submersible pump and the fire water tank; The first siphon drainage mechanism on the floor of the cabin corridor on the second floor is connected to the sump through a drainage pipe, so as to drain the fire water in the cabin corridor on the second floor to the sump, and then transport it back to the fire water tank through the fire submersible pump and the pressure-boosting pipe.

11. A method for operating a fire water system according to any one of claims 1 to 10, characterized in that: The following steps are involved: When a fire occurs in a cabin of a nuclear power ship, the fire water in the fire water tank is transported to the cabin where the fire occurs through the water supply pipeline for spraying and extinguishing the fire; The fire water sprayed onto the floor of the cabin flows to the cabin corridor, enters the drainage pipeline under the siphon effect of the first siphon drainage mechanism, and flows back to the fire water tank through the drainage pipeline.

12. The method for operating a fire water system according to claim 11, characterized in that: The following steps are also included: The fire water that flows to the cabin corridor and is not sucked in by the first siphon drainage mechanism is sucked into the drainage pipe by the second siphon drainage mechanism at the stair entrance when it flows to the stair entrance, and flows back to the fire water tank through the drainage pipe.

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