CN211669988U - Important service water system of offshore floating nuclear power station - Google Patents

Abstract

The utility model discloses an important service water system of a marine floating nuclear power station, which comprises at least one group of conveying units connected between a sea chest and a water outlet; the conveying unit comprises a seawater filter for roughly filtering seawater passing through the sea chest, a heat exchanger, a water intake pipeline connected between the seawater filter and the heat exchanger, a variable frequency pump set arranged on the water intake pipeline and used for providing power and adjusting pressure and flow, and a drainage pipeline connected between the heat exchanger and the drainage outlet. The utility model discloses derive equipment cooling water system heat; the pressure and the flow are adjusted by arranging the variable frequency pump, so that the flow of an important service water system can be effectively adjusted under the condition of large fluctuation of the seawater temperature, and the water supply temperature of an equipment cooling water system is controlled within a certain range; no need of return pipeline and related equipment, reduced resistance loss caused by regulating valve or additional pipeline, and increased economic efficiency.

Description

Important service water system of offshore floating nuclear power station

Technical Field

The utility model relates to a nuclear power technology field especially relates to an important service water system of marine floating nuclear power station.

Background

In the second generation unit, the important function of the plant water system is to guide the heat of the equipment cooling water system into the final hot trap, seawater. The system is an open circulating system, and the flowing working medium is seawater. The important service water system is divided into two independent series, and the equipment and the flow of the two series are basically the same.

The important service water system design has the advantage that when the temperature change of the seawater is large, the temperature change of the seawater affects the heat conduction capability of an equipment cooling water system (RRI). If the temperature of the seawater is lower in winter in the north, the water supply temperature of the equipment cooling water system is lower than the allowable temperature range, and boron crystallization of the RRI system user pipeline and brittle fracture of the pressure vessel can be seriously caused.

In the red coastal nuclear power station, in order to ensure that an RRI system is not cooled by too low seawater in winter, a single winter operation module is arranged to heat the seawater in important service water, wherein a bypass pipeline connecting an outlet of an RRI/SEC heat exchanger and an inlet of an SEC pump is arranged, and the heated seawater and low-temperature seawater are mixed to improve the temperature of the seawater.

Traditional power station exports the heat of RRI system through fixed flow, when sea water temperature variation range is big, can't adjust to sea water temperature variation, will seriously influence RRI system heat-conducting ability, influences the unit security. The red river nuclear power station adopts a backflow mode to adjust the flow, but the method has the following defects:

1. corresponding pipelines are required to be added, so that the cost is increased;

2. when the flow is adjusted by adopting the adjusting valve, larger throttling loss can be generated, and the economical efficiency is poorer;

3. the seawater temperature of the SEC system can only be increased, so that the water supply temperature of the RRI system is increased, and the water supply temperature of the RRI system cannot be reduced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in that, an important service water system of marine floating nuclear power station that effectively carries out flow control is provided.

The utility model provides a technical scheme that its technical problem adopted is: the important service water system of the offshore floating nuclear power station comprises at least one group of conveying units connected between a sea bottom door and a water outlet; the conveying unit comprises a seawater filter for roughly filtering seawater passing through the sea chest, a heat exchanger, a water intake pipeline connected between the seawater filter and the heat exchanger, a variable frequency pump set arranged on the water intake pipeline and used for providing power and adjusting pressure and flow, and a drainage pipeline connected between the heat exchanger and the drainage outlet.

Preferably, the variable-frequency pump group comprises two variable-frequency pumps arranged in parallel.

Preferably, the inlet end and the outlet end of each variable frequency pump are respectively provided with a first isolation valve.

Preferably, the outlet end of the variable frequency pump is also provided with a check valve.

Preferably, the inlet end and the outlet end of the heat exchanger are respectively provided with a second isolation valve.

Preferably, the conveying unit further comprises a pressure gauge, a flow gauge and a temperature gauge which are arranged on the water intake pipeline and located between the variable-frequency pump set and the heat exchanger.

Preferably, the transfer unit further comprises a shellfish catcher finely filtering the seawater;

the shellfish catcher is arranged on the water intake pipeline and is positioned between the variable-frequency pump set and the heat exchanger.

Preferably, the inlet end and the outlet end of the shellfish catcher are respectively provided with a third isolating valve.

Preferably, the critical service water system comprises two sets of the transport units.

Preferably, two sets of said conveyor units are connected in parallel between the subsea door and the drain.

Preferably, the important service water system further comprises a first communication pipeline connected between the water taking pipelines of the two groups of the conveying units; and/or the presence of a gas in the gas,

the important service water system also comprises a second communication pipeline connected between the two groups of drainage pipelines of the conveying units.

The utility model has the advantages that: the device is used for a marine floating nuclear power station and is used for guiding out heat of a cooling water system of the device; the pressure and the flow are adjusted by arranging the variable frequency pump, so that the flow of an important service water system can be effectively adjusted under the condition of large fluctuation of the seawater temperature, and the water supply temperature of an equipment cooling water system is controlled within a certain range; no need of return pipeline and related equipment, reduced resistance loss caused by regulating valve or additional pipeline, and increased economic efficiency.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic view of a connection structure of an important service water system according to an embodiment of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, an important service water system according to an embodiment of the present invention is used in a floating nuclear power plant at sea, and may include at least one set of transporting units connected between a sub-sea door 1 and a water outlet 2.

The seabed door 1 and the water outlet 2 may be included in an important service water system, or may be correspondingly disposed on a marine floating nuclear power plant independently of the important service water system. The sea chest 1 comprises a high-position sea chest and a low-position sea chest, and the high-position sea chest or the low-position sea chest is opened according to the water area of the ship when the conveying unit operates. For example, when the ship is inclined or in a stranded state, the conveying unit operates to open the lower sea-bottom door, and otherwise opens the upper sea-bottom door.

Wherein, the conveying unit comprises a seawater filter 10, a heat exchanger 20, a water intake pipe 30 connected between the seawater filter 10 and the heat exchanger 20, a variable frequency pump set 40 arranged on the water intake pipe 30, and a water discharge pipe 50 connected between the heat exchanger 20 and the water discharge port 2.

The seawater filter 10 is used for coarse filtering of seawater passing through a sea chest, such as filtering of impurities in seawater, such as seaweeds. The variable frequency pump unit 40 is used for providing power, pumping the seawater into the water intake pipeline 30 and conveying the seawater to the heat exchanger 20, and the variable frequency pump unit 40 can also automatically adjust the pressure and flow, and adjust the flow of the seawater conveyed to the heat exchanger according to the requirement.

In this embodiment, the variable frequency pump unit 40 includes two variable frequency pumps 41 arranged in parallel, wherein one variable frequency pump 41 serves as a main working pump, and the other variable frequency pump serves as a backup pump.

The inlet end and the outlet end of each variable frequency pump 41 are respectively provided with a first isolation valve 61, so that the variable frequency pumps 41 can be isolated independently when in failure or needing maintenance. The outlet end of the variable frequency pump 41 is also provided with a check valve 71.

The heat exchanger 20 is a heat exchanger of a cooling water system of equipment, and seawater carries out heat load through the heat exchanger and is finally discharged from a water discharge port through a water discharge pipeline 50. The inlet and outlet ends of the heat exchanger 20 are provided with second isolation valves 62, respectively, to facilitate separate isolation of the heat exchanger 20 in the event of a failure or need for maintenance.

Further, the delivery unit further comprises a pressure gauge 31, a flow meter 32 and a temperature gauge 33 arranged on the water intake pipe 30. The pressure gauge 31 and the flow gauge 32 are distributed at intervals, are positioned between the variable frequency pump unit 40 and the heat exchanger 20, are close to the outlet end of the variable frequency pump unit 40, and are respectively used for measuring the pressure and the flow in the water intake pipeline 30. The thermometer 33 is also arranged between the variable frequency pump unit 40 and the heat exchanger 20, close to the heat exchanger 30, and is used for detecting the temperature of seawater in the water intake pipeline 30.

The conveying unit also comprises a shellfish catcher 60 for finely filtering the seawater, and further filtering impurities such as sand, shellfish and the like in the seawater. The shellfish catcher 60 is arranged on the water taking pipeline 30 and is positioned between the variable-frequency pump unit 40 and the heat exchanger 20.

The inlet end and the outlet end of the shellfish catcher 60 are respectively provided with a third isolation valve 63, so that the shellfish catcher 60 can be isolated independently when in failure or needing maintenance.

On the water intake pipe 30, a pressure gauge 31 and a flow meter 32 are positioned between the variable-frequency pump unit 40 and the shellfish catcher 50, and a thermometer 33 is positioned between the shellfish catcher 50 and the heat exchanger 20.

As shown in fig. 1, in this embodiment, the important service water system includes two sets of conveying units. Two sets of conveying units are connected in parallel between the sea chest 1 and the water outlet 2. It is to be understood that the conveying units are not limited to two sets.

In addition, the important service water system further comprises a first communication pipeline 81 connected between the water intake pipelines 30 of the two sets of conveying units and a second communication pipeline 82 connected between the water discharge pipelines 50 of the two sets of conveying units, so that the two sets of conveying units can be mutually adjusted through the communication of the first communication pipeline 81 and the second communication pipeline 82. Both the first communicating channel 81 and the second communicating channel 82 may be provided or only one of them may be provided as necessary.

The utility model discloses an important service water system is on marine floating nuclear power station (nuclear power floating platform), and the ocean operating mode scope of being suitable for is wide, can adjust wantonly under 0 ℃ to 35 ℃ ocean temperature, can be higher than or be less than under the condition of design temperature at ocean temperature through inverter pump 41, adjusts the sea water flow to maintain basically unchangeable with RRI's heat transfer ability.

The utility model discloses an important mill water system work as follows:

in order to ensure the stable heat exchange capability of the RRI/SEC cooler, when the seawater temperature is low, the change of the seawater temperature and the RRI heat load at the moment can be measured, the required flow at the moment is obtained through calculation and a flow change signal is triggered, the motor frequency of the frequency conversion pump 41 can be automatically or manually operated by an operator at the moment, the rotating speed of the pump is reduced, the flow is reduced, and the heat exchange quantity between the pump and an RRI system is basically maintained unchanged; when the temperature of the seawater is high, the frequency of the variable frequency pump 41 can be adjusted to rise, the flow rate is increased, and the heat exchange amount is maintained.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. An important service water system of a marine floating nuclear power station is characterized by comprising at least one group of conveying units connected between a sea bottom door and a water outlet; the conveying unit comprises a seawater filter for roughly filtering seawater passing through the sea chest, a heat exchanger, a water intake pipeline connected between the seawater filter and the heat exchanger, a variable frequency pump set arranged on the water intake pipeline and used for providing power and adjusting pressure and flow, and a drainage pipeline connected between the heat exchanger and the drainage outlet.

2. The utility water system of claim 1, wherein the variable frequency pump package comprises two variable frequency pumps arranged in parallel.

3. The utility water system of claim 1, wherein each of the variable frequency pumps has a first isolation valve at an inlet end and an outlet end; and the outlet end of the variable frequency pump is also provided with a check valve.

4. The utility water system of claim 1, wherein the inlet and outlet ends of the heat exchanger are provided with a second isolation valve, respectively.

5. The utility water system of claim 1, wherein the delivery unit further comprises a pressure gauge, a flow meter and a temperature gauge disposed on the water intake conduit and between the variable frequency pump package and the heat exchanger.

6. The utility water system of claim 1, wherein the transfer unit further comprises a shellfish trap to fine filter seawater;

the shellfish catcher is arranged on the water intake pipeline and is positioned between the variable-frequency pump set and the heat exchanger.

7. A critical service water system as claimed in claim 6 wherein the shellfish catcher is provided with a third isolation valve at each of its inlet and outlet ends.

8. A service water system according to any of claims 1-7, wherein the service water system comprises two sets of said transport units.

9. The utility water system of claim 8, wherein two sets of said conveyor units are connected in parallel between a subsea door and a drain.

10. The utility water system of claim 8, further comprising a first communication conduit connected between the water intake conduits of the two sets of the transport units; and/or the presence of a gas in the gas,

the important service water system also comprises a second communication pipeline connected between the two groups of drainage pipelines of the conveying units.

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