CN108867766B - Emergency water supply method for important plant water system of nuclear power ship - Google Patents
Emergency water supply method for important plant water system of nuclear power ship Download PDFInfo
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- CN108867766B CN108867766B CN201810750671.8A CN201810750671A CN108867766B CN 108867766 B CN108867766 B CN 108867766B CN 201810750671 A CN201810750671 A CN 201810750671A CN 108867766 B CN108867766 B CN 108867766B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/02—Arrangements or adaptations of tanks for water supply for domestic or like local water supply
Abstract
The invention provides an emergency water supply method for an important service water system of a nuclear power ship, which comprises the steps of firstly arranging an interface on a ballast water main pipe of the ballast water system of the nuclear power ship, and connecting an interface pipeline to a water inlet pipe of the important service water system; when the normal water taking means of the important service water system fails and emergency water supply is needed, the interface is communicated with the water inlet pipe of the important service water system, so that the ballast water system can supply water for the important service water system through the ballast water main pipe and the interface. The invention can utilize the existing system of the nuclear power ship to provide seawater meeting the water use requirement for an important plant water system.
Description
Technical Field
The invention relates to the field of water supply of important plant water systems of nuclear power ships, in particular to an emergency water supply method of the important plant water systems of the nuclear power ships.
Background
The important service water system is an important system related to nuclear safety, which takes seawater as a cooling medium, is used for providing the seawater which is subjected to chlorination filtration for the equipment cooling water system, and takes away the heat of high-temperature desalted water in the equipment cold water taking system through a heat exchanger to serve as a cold source of the equipment cooling water system. And the equipment cooling water system is used for providing cooled desalted water for each user in the nuclear reactor and taking away heat of each user through the heat exchanger. The nuclear reactor needs to continuously conduct heat export under normal operation and accident operation to ensure the nuclear safety, so the normal operation of important plant water systems is very important.
In order to ensure the normal operation of the important service water system, seawater meeting the requirements needs to be continuously provided for the important service water system.
For onshore nuclear power stations, a circulating water filtering system is generally adopted to supply water for an important plant water system of the onshore nuclear power station, and in order to ensure the normal operation of the important plant water system when the normal water supply of the circulating water filtering system fails, the important plant water system of the EPR third-generation nuclear power unit is provided with a pipeline connecting an original water outlet and a water pump inlet, when the normal water taking fails, a valve on the pipeline can be opened by the pipeline, water is poured from the original water outlet, and the heated seawater is discharged into the original water taking port through a water diversion channel.
The nuclear power ship is provided with an independent sea chest as a water intake, sea water is taken through the sea chest, the sea organisms are killed by adding the drugs, and the sea water is filtered by a sea water filter arranged at the downstream of the sea chest, so that the sea water meeting the requirements of an important plant water system is provided. When normal water supply fails, if the dumping/drainage mode of a land nuclear power station is adopted to supply water for an important plant water system, the dosing and fine filtration of the dumped seawater are difficult to realize, so that the seawater quality cannot be ensured; if the emergency water intake is added to serve as a water intake way of an important plant water system, as can be seen from the foregoing, the equipment required for realizing the process is complex, the occupied space is large, the construction and maintenance costs are high, the space of the nuclear power ship is limited, additional water intake occupies additional space, the cost is increased, and the risk of common failure of the water intake (for example, the water intake is blocked by floating ice on the sea surface in winter, and all seawater filters are blocked due to too high density of marine life and the like) also exists.
Therefore, how to utilize the existing system of the nuclear power ship under the condition that the normal water supply fails is a problem to be solved at present, and the seawater meeting the water use requirement is provided for the important plant water system.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for emergency water supply for an important plant water system by utilizing the existing system of a nuclear power ship aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is to provide an emergency water supply method for an important plant water system of a nuclear power ship, which comprises the following steps:
(1) arranging an interface on a ballast water main pipe of a ballast water system of the nuclear power ship, and connecting the interface pipeline to a water inlet pipe of the important service water system;
(2) and communicating the interface with a water inlet pipe of the important service water system, so that the ballast water system supplies water for the important service water system through the ballast water main pipe and the interface.
Preferably, the ballast water system comprises a subsea door, a seawater filter and a ballast pump; in the step (2), the ballast water system takes seawater from a sea chest of the ballast water system, adds drugs to kill marine organisms, filters the taken seawater through the seawater filter, boosts the pressure by the ballast pump, pumps the seawater into the ballast water main pipe, and sends the seawater into a water inlet pipe of the important plant water system through the interface.
Preferably, the ballast water system comprises at least two subsea doors, and a water taking valve is arranged between the at least two subsea doors and on the ballast water main pipe; in the step (2), the ballast water system selects to take seawater from one of the at least two subsea doors by controlling the opening or closing of the water taking valve.
Preferably, the ballast water system comprises a plurality of ballast tanks; in the step (2), the ballast water system sends the seawater in one of the ballast tanks to an inlet pipe of the important plant water system through the ballast water main pipe and the interface.
Preferably, each ballast tank is provided with a valve connected to the ballast water main; in the step (2), the ballast water system is switched among the plurality of ballast tanks by controlling the opening or closing of the valves of the plurality of ballast tanks, so that after the seawater in one of the plurality of ballast tanks is sent to the important plant water system, the seawater in another one of the plurality of ballast tanks is sent to the inlet pipe of the important plant water system through the ballast water main pipe and the interface.
Preferably, the method further comprises, after the step (2): the important service water system discharges the used seawater through a water outlet of the important service water system.
Preferably, the step (1) further comprises: arranging another interface on a ballast water main pipe of a ballast water system of the nuclear power ship, and connecting the other interface pipeline to a water outlet pipe of the important service water system; the method further comprises, after the step (2): the seawater used by the important service water system is sent out by the water outlet pipe and is discharged into an unloaded ballast tank of the ballast water system through the other interface and the ballast water main pipe.
Preferably, the interface comprises a first interface and a second interface; the step (1) comprises the following steps: arranging the first interface at an upper pipe section of the ballast water main pipe, arranging the second interface at a lower pipe section of the ballast water main pipe, and connecting the first interface and the second interface to a water inlet pipe and a water outlet pipe of the important plant water system through cross arrangement pipelines; in the step (2), one of the first interface and the second interface is communicated with a water inlet pipe of the important service water system, and the other one of the first interface and the second interface is communicated with a water outlet pipe of the important service water system; the method further comprises, after the step (2): the seawater used by the important service water system is sent out by the water outlet pipe and is discharged into an unloaded ballast tank of the ballast water system through the other interface and the ballast water main pipe.
Preferably, the interface comprises a first interface and a second interface; the step (1) comprises the following steps: arranging the first interface at an upper pipe section of the ballast water main pipe, arranging the second interface at a lower pipe section of the ballast water main pipe, and connecting the first interface and the second interface to a water inlet pipe and a water outlet pipe of the important plant water system through cross arrangement pipelines; and (3) connecting one of the first interface and the second interface with a water inlet pipe of the important service water system in the step (2).
Preferably, the crossed pipeline includes four pipelines, each pipeline is provided with a plurality of valves, two ends of a first pipeline of the four pipelines are respectively connected with the first interface and the water inlet pipe, two ends of a second pipeline are respectively connected with the first interface and the water outlet pipe, two ends of a third pipeline are respectively connected with the second interface and the water inlet pipe, and two ends of a fourth pipeline are respectively connected with the second interface and the water outlet pipe; in the step (2), one of the first interface and the second interface and the water inlet pipe of the important service water system are communicated by controlling the opening or closing of the plurality of valves, and the other one of the first interface and the second interface is communicated or not communicated with the water outlet pipe of the important service water system.
The emergency water supply method for the important plant water system of the nuclear power ship can provide seawater meeting the water use requirement for the important plant water system for a long time or a short time by utilizing the system, namely the ballast water system, of the nuclear power ship under the condition that the normal water taking means of the important plant water system fails, so that the important plant water system of the nuclear power ship can continuously execute the safety function, the probability of losing the final cold source of a unit is reduced, the accident is prevented from further worsening, and the safety of the unit is improved. The invention does not need to additionally add large-scale equipment, saves the arrangement space, reduces the construction and maintenance cost and can ensure the water quality of water supply under emergency. In addition, when the ballast tank of the ballast water system is used for supplying water to an important plant water system, the risk of common cause failure of the water intake when a ship takes water through the subsea door can be avoided.
Drawings
Fig. 1 is a flow chart of an emergency water supply method of an important service water system of a nuclear powered vessel of the present invention.
Fig. 2 is a schematic view of the connection structure of the cross-disposed pipes of the present invention.
Fig. 3 is a conceptual view illustrating an emergency water supply method of an important service water system of a nuclear powered vessel according to the present invention.
Fig. 4 is a partial structural view of a ballast water system of a nuclear powered vessel according to the present invention.
Detailed Description
The emergency water supply method for the important service water system of the nuclear power ship utilizes the ballast water system of the nuclear power ship as an emergency water supply system, and supplies water to the important service water system when the normal water taking means of the important service water system of the nuclear power ship fails.
In a nuclear power ship, a ballast water system is used for filling or discharging ballast tanks distributed on the whole ship according to the operation requirements of the ship so as to achieve the purposes of adjusting the draught of the ship and the longitudinal and transverse stable and safe steady height of the ship body, reducing the deformation of the ship body, avoiding causing overlarge bending moment and shearing force, reducing the vibration of the ship body and improving the airworthiness of the ship cabin. The ballast water system is provided with independent sea chest, seawater filter, ballast pump, ballast water pipeline, ballast tank and relevant valves. Seawater enters a ballast water system of the nuclear power ship from a sea chest, marine organisms in the seawater are killed by adding drugs, the seawater is filtered by a seawater filter, the pressure is increased by a ballast pump, the seawater is pumped into a ballast water main pipe in a ballast water pipeline, and the seawater is sent into ballast tanks distributed in the whole ship by the ballast water main pipe.
The emergency water supply method of the nuclear power vessel important plant water system of the invention, as shown in figure 1, firstly setting an interface on a ballast water main pipe of the nuclear power vessel ballast water system, and connecting the interface pipeline to a water inlet pipe of the important plant water system; when the normal water taking means of the important service water system fails and emergency water supply is needed, the interface is communicated with the water inlet pipe of the important service water system, so that the ballast water system can supply water for the important service water system through the ballast water main pipe and the interface.
The interfaces can comprise a first interface and a second interface, the first interface and the second interface are connected to an inlet pipe and an outlet pipe of an important service water system through a cross arrangement pipeline, one of the first interface and the second interface is selected to be communicated with the inlet pipe by controlling a valve on the cross arrangement pipeline, and the other interface is selected to be communicated with or not communicated with the outlet pipe according to requirements. In another embodiment, another interface is provided directly to the ballast water main of the ballast water system and the other interface is piped to the outlet pipe of the utility water system of interest. In both cases, the water outlet pipe of the important service water system can be selectively connected or disconnected according to the requirement, for example, the water outlet pipe is connected under the condition that the important service water system needs to drain water to enter the ballast water system, and the water outlet pipe does not need to be connected if the important service water system drains water through the water outlet of the important service water system.
When the ballast water main pipe is provided with the first interface and the second interface and is connected to the water inlet pipe and the water outlet pipe of the important service water system through the crossed pipelines, the first interface can be selectively arranged at the upper pipe section of the ballast water main pipe, the second interface is arranged at the lower pipe section of the ballast water main pipe, and the first interface and the second interface are connected with the water inlet pipe and the water outlet pipe of the important service water system through the crossed pipelines. As shown in fig. 2, the pipeline 10 is provided with four pipelines in a crossing manner in this embodiment, each pipeline is provided with a plurality of valves to control the on/off of the pipeline, two ends of the four pipelines are respectively connected to the first interface 31 and the water inlet pipe 21, the first interface 31 and the water outlet pipe 22, the second interface 32 and the water inlet pipe 21, the second interface 32 and the water outlet pipe 22, and the first interface 31, the second interface 32 and the water inlet pipe 21 and the water outlet pipe 22 of the important service water system can be connected in any combination by controlling the valves on each pipeline.
Specifically, the first pipeline connects the first interface 31 and the water inlet pipe 21, the fifth valve 5 and the seventh valve 7 are sequentially arranged on the first pipeline, and the first interface 31 can be communicated with the water inlet pipe 21 by opening the fifth valve 5 and the seventh valve 7; the second pipeline is connected with the first interface 31 and the water outlet pipe 22, a third valve 3, a second valve 2 and an eighth valve 8 are sequentially arranged on the second pipeline, and the first interface 31 can be communicated with the water outlet pipe 22 by opening the third valve 3, the second valve 2 and the eighth valve 8; the third pipeline is connected with the second interface 32 and the water inlet pipe 21, a fourth valve 4, a first valve 1 and a seventh valve 7 are sequentially arranged on the third pipeline, and the second interface 32 can be communicated with the water inlet pipe 21 by opening the fourth valve 4, the first valve 1 and the seventh valve 7; the fourth pipeline connects the second interface 32 and the water outlet pipe 22, a sixth valve 6 and an eighth valve 8 are sequentially arranged on the fourth pipeline, and the second interface 32 can be communicated with the water outlet pipe 22 by opening the sixth valve 6 and the eighth valve 8. The on-off control and corresponding communication interfaces of the specific valve are shown in the following table one:
watch 1
Note: "\\" indicates a switch.
After the arrangement, the main ballast water pipe of the ballast water system of the nuclear power ship can be connected with an important service water system. As shown in fig. 3, the utility water system 20 is connected to the ballast water main pipe 41 of the ballast water system 40 via the inlet pipe 21, the outlet pipe 22, the cross-disposed pipeline 10, the first port 31, and the second port 32. When the normal water taking means of the important industrial water system 20 fails, the cross-arrangement pipeline 10 is opened, so that the ballast water main pipe 41 is communicated with the water inlet pipe 21 of the important industrial water system 20, i.e., the important industrial water system 20 can be supplied with water by the ballast water system 40. The ballast water system 40 can be provided to the important plant water system 20 after being treated by taking seawater from the sea chest, or can be provided to the important plant water system 20 directly by taking seawater from the ballast tank, and both of them can provide seawater meeting the water demand.
If the ballast water system 40 selects to take seawater through the sea chest thereof and provide the seawater to the important plant water system 20, one of the first interface 31 or the second interface 32 and the water inlet pipe 21 of the important plant water system 20 (the valve in the pipeline 10 is controlled and arranged crossly according to the serial number 1 or 3 in the table I) can be selected to be communicated, the ballast water system 40 firstly takes seawater through the sea chest thereof and adds the taken seawater to kill marine organisms, the seawater is filtered by the seawater filter and then is pressurized by the ballast pump and pumped into the ballast water main pipe 41, and the seawater which meets the water use requirement is provided for the important plant water system 20 through the communicated interface and the water inlet pipe 21. The seawater used by the utility water system 20 can be directly discharged through the water outlet.
If the ballast water system 40 is selected to provide the seawater in its ballast tanks directly to the essential service water system 20, and in particular, in some cases, all of the intake ports are lost (e.g., the intake ports are lost due to common cause failure, such as ice floes on the sea surface in winter, all of the seawater filters are blocked due to excessive sea biomass density, etc.), the present invention may provide the seawater in its ballast tanks to the essential service water system 20 from the ballast water system 40. At this time, one of the first and second ports 31 and 32 is connected to the inlet pipe 21 of the critical service water system 20, and the other of the first and second ports 31 and 32 is connected to the outlet pipe 22 of the critical service water system 20 by controlling the valve of the cross-disposed pipe 10. The ballast water system 40 feeds water in one of the ballast tanks to the inlet pipe 21 of the essential service water system 20 through the ballast water main pipe 41; the essential service water system can then discharge its used seawater via its outlet pipe 22 via the ballast water main pipe 41 into another ballast tank of the ballast water system 40.
The ballast water system 40 can be switched to supply the essential service water system 20 with seawater by switching other ballast tanks through valves, and the empty ballast tanks can be switched to carry seawater discharged from the essential service water system.
In the above process, the ballast water system 40 and the related valves in the cross-setting pipes 10 may be controlled to be opened and closed as necessary to ensure smooth water flow.
Therefore, the invention can provide seawater meeting the water use requirement for the important service water system for a long time or a short time under the condition that the normal water taking means of the important service water system fails, and ensures that the important service water system still performs all or part of the safety function.
Two specific examples are given below to further illustrate the invention.
Example one
The seawater is extracted from the outside by using the water intake filtering device of the ballast water system for the important service water system.
As shown in fig. 4, a partial structural view of a ballast water system 40 of a nuclear power vessel is shown. The ballast water system 40 includes independent sea chest 420, seawater filters 421 and ballast pumps 422, ballast water lines (only the ballast water main pipe 41 is shown), a plurality of ballast tanks a1, B1, C1, a2, B2, and C2, and a plurality of valves.
First, the first connector 31 is disposed at the upper pipe section of the ballast water main section 41, the second connector 32 is disposed at the lower pipe section of the ballast water main pipe 41, and the first connector 31 and the second connector 32 are connected to the water inlet pipe 21 and the water outlet pipe 22 of the important plant water system 20 by the cross-disposed pipe 10, as shown in fig. 2.
Initially, all valves in the ballast water system 40 and the cross-over piping 10 are considered closed.
When the normal water intake means of the important plant water system 20 fails, the valves 423, 424, 425, 426 in the ballast water system 40 are opened, the ballast pump 422 and the related devices are opened, and the related valves in the cross-setting pipeline 10 are opened in the manner shown by the serial number 1 in table one so that the first interface 31 communicates with the inlet pipe 21 of the important plant water system 20 (see fig. 2).
Then, the ballast water system 40 takes seawater from the outside through the sea chest 420, adds chemicals to the taken seawater to kill marine organisms, filters the seawater through the seawater filter 421, boosts the pressure by the ballast pump 422, pumps the seawater into the ballast water main pipe 41 in the ballast water pipeline, and sends the seawater into the inlet pipe 21 of the important plant water system 20 through the first connector 31 and the cross-installation pipeline 10 (the first pipeline thereof). Thus, the ballast water system 40 can provide seawater that meets the demand for water for the critical service water system 20.
The seawater used by the essential service water system 20 is discharged through the water outlet thereof.
In the process, the second interface 32 can be selectively communicated with the water inlet pipe 21 of the important service water system 20 or communicated with the water inlet pipe 21 of the important service water system 20 through switching of the crossed pipeline 10, and the ballast water system 40 can also supply water to the important long-service water system 20.
In addition, the present invention can also switch between multiple subsea doors of the ballast water system 40, one of which is selected as the important service water system 20 for water supply. As shown in fig. 4, the ballast water system 40 is further provided with an independent subsea door 420 'and corresponding seawater filter 421' and ballast pump 422 ', and a water intake valve 427 is provided between the two ballast pumps 422 and 422' and at the ballast water main 41. In the process that the ballast water system 40 takes water through the subsea door 420 and supplies water to the important plant water system through the first interface 31, if switching to taking water from the subsea door 420 'is required, the subsea door 420', the valves 423 ', 424', 425 ', 426', the seawater filter 421 'and the ballast pump 422' are opened first, the water taking valve 427 is opened, and the subsea door 420 is closed, so that switching between the subsea doors 420 'and 420 for taking water can be realized, and water can be taken from the subsea door 420'. Before and after the process, the switching of the crossed pipeline 10 can be utilized to realize the water supply for the important service water system through the second interface 32.
Example two
Seawater is taken from ballast tanks distributed in the whole ship from a ballast water system and is used by an important service water system.
The invention can supply water for important plant water systems through the ballast tanks of the ballast water system, particularly in the case of losing all water intake ports (such as blockage of all water intake ports due to excessive ice floe on the sea surface in winter).
As shown in fig. 4, the ballast water system 40 is provided with a plurality of ballast tanks a1, a2, B1, B2, C1, C2 and a corresponding plurality of valves, and a main suction port 43 and a scavenging port 44 are provided in each ballast tank to be connected to the ballast main pipe 41.
First, the first connector 31 is disposed at the upper pipe section of the ballast water main section 41, the second connector 32 is disposed at the lower pipe section of the ballast water main pipe 41, and the first connector 31 and the second connector 32 are connected to the water inlet pipe 21 and the water outlet pipe 22 of the important plant water system 20 by the cross-disposed pipe 10, as shown in fig. 2.
Initially, all valves in the ballast water system 40 and the cross-over piping 10 are considered closed and all ballast tanks are considered full.
When the normal water intake means of the essential service water system 20 fails, the valves 428, 429 connected to the main suction port 43 and the scavenge suction port 44 of the ballast tank A1 in the ballast water system 40 are opened and the associated valves in the cross-disposed piping 10 are opened in the manner indicated by the reference numeral 1 in Table one so that the first port 31 communicates with the inlet pipe 21 of the essential service water system 20 (see FIG. 2). The ballast water system 40 then sends the seawater in its ballast tank a1 to the inlet pipe 21 of the utility water system 20 via the ballast water main pipe 41, the first connection 31, and the cross-disposed piping 10 (the first line thereof). Thus, the ballast water system 40 can provide seawater that meets the demand for water for the critical service water system 20. The seawater used by the essential service water system 20 is discharged through the water outlet thereof.
When the seawater in the ballast tank a1 is exhausted, the valves 428 ', 429' of the ballast water system 40 connected to the main suction port 43 'of the ballast tank a2 and the scavenge suction port 44' are opened, and the cross-set piping 10 is switched, i.e., the associated valves in the cross-set piping 10 are opened in the manner shown by reference numerals 2 and 3 in table one so that the first port 31 communicates with the outlet pipe 22 of the essential service water system 20 and the second port 32 communicates with the inlet pipe 21 of the essential service water system 20 (see fig. 2). The ballast water system 40 then sends the seawater in its ballast tank a2 to the inlet pipe 21 of the utility water system 20 via the ballast water main pipe 41, the second port 32, and the cross-disposed piping 10 (the third line thereof). Thus, the ballast water system 40 continues to provide the essential service water system 20 with seawater in accordance with the demand for water, and the essential service water system 20 discharges the used seawater into the ballast tank a1 through the first port 31, and the valves 428, 429 are closed when the seawater in the ballast tank a1 meets the demand for water storage.
By analogy, when the pumped ballast tank is depleted of seawater, the other ballast tank can be switched so that the ballast water system 40 can continue to be provided with seawater from the ballast tank to the essential service water system 20 that meets the demand for water.
The above embodiment is performed when all of the ballast tanks are initially considered fully loaded, and the essential service water system 20 is required to remove the extracted seawater from the first ballast tank to the outside, thereby creating an empty ballast tank. If the ballast water system 40 has empty ballast tanks in the initial state, the first interface 31 and the inlet pipe 21 of the essential service water system 20 and the second interface 32 and the outlet pipe 22 of the essential service water system 20 are simultaneously connected, so that the seawater used by the essential service water system 20 can be directly discharged into the empty ballast tanks.
It should be noted that when seawater in the ballast tanks is sequentially pumped by the above method for use by the important plant water system 20, it should be noted that the water storage amount of the ballast tanks for pumping and draining is similar, so as to avoid that the pumped ballast tanks store more water than the capacity of the empty ballast tanks for draining.
In addition, the present invention may further include a temperature measuring device provided in the ballast tank, and the hot seawater discharged into the ballast tank after being used by the important service water system 20 is cooled by the hull during winter operation, and after the seawater in the ballast tank is lowered to the allowable use temperature range of the important service water system 20, the seawater may be repeatedly pumped for use, so as to supply water to the important service water system for a long or short period of time in an emergency situation.
The invention can also be switched between the two water supply modes of the first embodiment and the second embodiment to supply water for the important plant water system of the nuclear power ship, and the two water supply modes can both provide seawater meeting the water use requirement for the plant water system. In addition, the water supply mode of the invention can not only provide emergency water supply for important plant water systems, but also provide emergency water supply for other water systems of the nuclear power ship, such as a central cooling system, a water fire extinguishing system and the like.
As can be seen from the above description, the emergency water supply method for an important service water system of a nuclear power vessel according to the present invention can provide seawater meeting water use requirements for the important service water system for a long time or a short time by using a ballast water system, which is a system of the nuclear power vessel itself, in case that a normal water intake means of the important service water system fails, so as to ensure that the important service water system of the nuclear power vessel continues to perform its safety function, reduce the probability of the unit losing a final cold source, prevent an accident from further deteriorating, and improve the safety of the unit. Specifically, the invention also has the following beneficial effects:
1. the invention utilizes the existing ballast water system on the nuclear power ship as the water supply of the important service water system, does not need to additionally add large-scale equipment, saves the arrangement space, reduces the construction and maintenance cost, realizes the function combination at the same time, and improves the utilization degree of the equipment;
2. the water is taken through the ballast water system, and the water quality of the water supply under the emergency condition can be ensured by utilizing the filtering and dosing device of the ballast water system;
3. the invention adopts the ballast water system to supply water for the important plant water system of the nuclear power ship, can switch between two water supply modes by the arrangement of the crossed pipelines and the control of the valves in the ballast water system, selects an applicable mode according to different situations of the nuclear power ship, is simple and reliable, and is non-nuclear (except for the seventh valve 7 and the eighth valve 8 in the figure 2) except for the valves (such as the seventh valve 7 and the eighth valve 8 in the figure 2) connecting the ballast water system and the important plant water system as nuclear-grade equipment, thereby greatly reducing the equipment cost;
4. the invention utilizes the ballast water system to take water from the sea chest and utilize the ballast pump to absorb water to supply water for the important service water system, thereby improving the seawater pressure at the inlet of the important service water system, avoiding the reduction of the effective cavitation allowance of the seawater pump due to the overlarge flow resistance of the cold chain suction inlet caused by the overlong ballast water main pipe, ensuring the normal operation of the seawater pump under the accident and avoiding the cavitation influence;
5. the invention utilizes the ballast water system to extract the seawater stored in the ballast tank to provide the important service water system, and discharges the seawater used by the important service water system into the ballast tank, thereby being capable of supplying water to the important service water system for a long time or a short time under emergency conditions, ensuring the water quality of supplied water, avoiding the risk of water intake common cause failure (such as water intake blockage caused by floating ice on the sea surface in winter, blockage of all seawater filters caused by overhigh density of marine organisms and the like) when ships take water through the sea chest, effectively reducing the frequency of common cause failure of emergency water taking means and conventional water taking means, being an embodiment of deep defense, and improving the capability of the unit to deal with accidents.
Claims (8)
1. An emergency water supply method for an important plant water system of a nuclear power ship is characterized by comprising the following steps:
(1) arranging an interface on a ballast water main pipe of a ballast water system of the nuclear power ship, and connecting the interface pipeline to a water inlet pipe of the important service water system; wherein the interface comprises a first interface and a second interface; arranging the first interface at an upper pipe section of the ballast water main pipe, arranging the second interface at a lower pipe section of the ballast water main pipe, and connecting the first interface and the second interface to a water inlet pipe and a water outlet pipe of the important plant water system through cross arrangement pipelines; the crossed pipeline comprises four pipelines, each pipeline is provided with a plurality of valves, two ends of a first pipeline in the four pipelines are respectively connected with the first interface and the water inlet pipe, two ends of a second pipeline are respectively connected with the first interface and the water outlet pipe, two ends of a third pipeline are respectively connected with the second interface and the water inlet pipe, and two ends of a fourth pipeline are respectively connected with the second interface and the water outlet pipe;
(2) communicating the interface with a water inlet pipe of the important service water system, so that the ballast water system supplies water for the important service water system through a ballast water main pipe and the interface; wherein one of the first interface and the second interface is communicated with a water inlet pipe of the important service water system; one of the first interface and the second interface is communicated with a water inlet pipe of the important service water system by controlling the opening or closing of the valves, and the other one of the first interface and the second interface is communicated with or not communicated with a water outlet pipe of the important service water system;
if the ballast water system is pressed under the initial state, namely the empty ballast tank exists, the first interface and the water inlet pipe of the important plant water system and the water outlet pipe of the important plant water system are simultaneously communicated, and the seawater used by the important plant water system is discharged into the empty ballast tank;
the ballast tank is internally provided with a temperature measuring device, when the ship runs in winter, hot seawater discharged into the ballast tank after being used by an important service water system is cooled by the ship body, and when the seawater in the ballast tank is reduced to the allowable use temperature range of the important service water system, the seawater is repeatedly extracted and used.
2. The emergency water supply method of claim 1, wherein the ballast water system comprises a subsea door, a seawater filter, and a ballast pump; in the step (2), the ballast water system takes seawater from a sea chest of the ballast water system, adds drugs to kill marine organisms, filters the taken seawater through the seawater filter, boosts the pressure by the ballast pump, pumps the seawater into the ballast water main pipe, and sends the seawater into a water inlet pipe of the important plant water system through the interface.
3. An emergency water supply method according to claim 2, wherein the ballast water system comprises at least two subsea doors, a water intake valve being provided between the at least two subsea doors on the ballast water main; in the step (2), the ballast water system selects to take seawater from one of the at least two subsea doors by controlling the opening or closing of the water taking valve.
4. The emergency water supply method of claim 1, wherein the ballast water system comprises a plurality of ballast tanks; in the step (2), the ballast water system sends the seawater in one of the ballast tanks to an inlet pipe of the important plant water system through the ballast water main pipe and the interface.
5. An emergency water supply method according to claim 4 wherein each ballast tank is provided with a valve connected to the ballast water main; in the step (2), the ballast water system is switched among the plurality of ballast tanks by controlling the opening or closing of the valves of the plurality of ballast tanks, so that after the seawater in one of the plurality of ballast tanks is sent to the important plant water system, the seawater in another one of the plurality of ballast tanks is sent to the inlet pipe of the important plant water system through the ballast water main pipe and the interface.
6. An emergency water supply method according to claim 2, 3 or 4, wherein the method further comprises, after the step (2): the important service water system discharges the used seawater through a water outlet of the important service water system.
7. The emergency water supply method according to claim 4 or 5, wherein the step (1) further comprises: arranging another interface on a ballast water main pipe of a ballast water system of the nuclear power ship, and connecting the other interface pipeline to a water outlet pipe of the important service water system; the method further comprises, after the step (2): the seawater used by the important service water system is sent out by the water outlet pipe and is discharged into an unloaded ballast tank of the ballast water system through the other interface and the ballast water main pipe.
8. An emergency water supply method according to claim 4 or 5 wherein the interface comprises a first interface and a second interface; the step (1) comprises the following steps: arranging the first interface at an upper pipe section of the ballast water main pipe, arranging the second interface at a lower pipe section of the ballast water main pipe, and connecting the first interface and the second interface to a water inlet pipe and a water outlet pipe of the important plant water system through cross arrangement pipelines; in the step (2), one of the first interface and the second interface is communicated with a water inlet pipe of the important service water system, and the other one of the first interface and the second interface is communicated with a water outlet pipe of the important service water system; the method further comprises, after the step (2): the seawater used by the important service water system is sent out by the water outlet pipe and is discharged into an unloaded ballast tank of the ballast water system through the other interface and the ballast water main pipe.
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