JP6771338B2 - Pump system and its operation method and power plant - Google Patents

Description

The present disclosure relates to a pump system, its operating method, and a power plant.

For example, in the condensate system equipment of power plants such as thermal power and nuclear power, when the condensate passes through these devices such as iron remover and desalination device in order to improve the water quality of water supply to the boiler and steam generator. Equipment that causes condensate pressure loss (hereinafter referred to as pressure loss equipment) may be provided. In addition, a booster pump may be provided to compensate for the pressure loss caused by the pressure loss device.

Patent Document 1 discloses a pump system in which an iron remover and a booster pump are provided in series and a bypass line for bypassing the iron remover and the booster pump is provided for the water recovery system equipment of a power plant. There is.

In such a configuration, when the iron remover is not used, the bypass valve provided in the bypass line can be fully opened and water can be sent via the bypass line, so that the iron remover can be repaired or inspected during the operation of the plant. Is also possible.

Japanese Unexamined Patent Publication No. 2001-296061

When a failure or the like occurs in the booster pump in the configuration described in Patent Document 1, it becomes necessary to fully open the bypass valve manually or by a drive source to switch the flow path used to the bypass line. In this case, the flow rate of the system fluctuates during the operation of the bypass valve until the bypass valve is fully opened, which may affect the operation of the plant.

In addition, if the bypass valve is accidentally opened for some reason while the pressure loss equipment and booster pump are in operation, the fluid boosted by the booster pump flows back to the bypass line, and the flow rate of the booster pump becomes the rated flow rate. There is a risk of overflow conditions exceeding. Overflow conditions in the booster pump can cause cavitation-induced damage to equipment downstream of the booster pump, which can affect plant operation.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a pump system capable of appropriately controlling the flow rate, an operation method thereof, and a power plant.

(1) The pump system according to at least one embodiment of the present invention is provided with a fluid line for flowing a fluid, a pressure loss device provided in the fluid line, and a downstream side of the pressure loss device in the fluid line. And at least one booster pump configured to boost the fluid so that at least a portion of the pressure loss in the pressure drop device is compensated for, and the fluid line upstream of the pressure loss device in the fluid line. A bypass line that branches from the above and joins the fluid line on the downstream side of the booster pump, a bypass valve provided in the bypass line that is configured to be opened and closed manually or by a drive source, and the bypass valve in the bypass line. It is provided with a check valve which is provided in series with and is configured to open and close by a front-rear differential pressure.

According to the pump system described in (1) above, the pressure of the fluid boosted by the booster pump is increased during the operation of the booster pump by keeping the bypass valve always open regardless of the operating state of the booster pump. It is possible to keep the check valve that opens and closes by the front-rear differential pressure in the closed state. Further, when the booster pump trips (when the operation is stopped due to a failure or the like), the booster pump does not boost the fluid, so that the check valve quickly switches to the open state due to the change in the front-rear differential pressure.

Therefore, as compared with the case where the above two lines are switched by manually opening and closing the bypass valve, it is possible to reduce the operational burden on the operator. Further, since the check valve can be quickly closed by the front-rear differential pressure of the check valve, the flow rate fluctuation can be suppressed and the flow rate can be appropriately controlled.

Further, since it is not necessary to open / close the bypass valve to switch between the fluid line and the bypass line, the operator does not erroneously operate the bypass valve. Therefore, while improving the reliability of the pump system and the plants that use it, the check valve suppresses the occurrence of backflow to the bypass line due to the overflow state of the booster pump and manages the flow rate appropriately. be able to.

(2) In some embodiments, in the pump system according to (1) above, the check valve is provided on the downstream side of the bypass valve in the bypass line.

According to the pump system described in (2) above, the pressure on the downstream side of the check valve (fluid boosted by the booster pump) is compared with the case where the check valve is provided on the upstream side of the bypass valve in the bypass line. Since the flow path cross-sectional area of the bypass valve does not directly affect the pressure), the reliability of the opening / closing operation of the check valve can be improved.

(3) In some embodiments, in the pump system according to (1) or (2) above, the pressure loss device includes a condensate desalting apparatus for desalting condensed condensate with a condenser. ..

According to the pump system described in (3) above, in a pump system provided with a booster pump for compensating at least a part of the pressure loss generated in the condensate desalting apparatus, as described in (1) above. The flow rate can be controlled appropriately.

(4) In some embodiments, in the pump system according to any one of (1) to (3) above, the fluid line is provided in parallel on the downstream side of the pressure loss device. The at least one booster pump includes a flow path, and includes a plurality of booster pumps provided in each of the plurality of flow paths.

According to the pump system described in (4) above, even if one or two or more of the plurality of booster pumps are stopped due to a failure or the like, the check valve is opened by the front-rear differential pressure to be used. Since the line to be pumped is quickly switched to the bypass line, fluctuations in the flow rate can be suppressed and the influence on plant operation can be reduced.

(5) The pump system according to at least one embodiment of the present invention includes a plurality of flow paths provided in parallel for flowing fluids, a plurality of booster pumps provided in the plurality of flow paths, and the plurality of pumps. A control device configured to suppress the occurrence of an overflow state in which the flow rate of the one booster pump exceeds the rated flow rate due to the operation of one of the booster pumps independently. Be prepared.

According to the pump system described in (5) above, the downstream side of the booster pump is suppressed by the control device to suppress the occurrence of the overflow state of the booster pump due to the operation of one booster pump independently. It is possible to prevent the equipment from being damaged due to cavitation.

(6) In some embodiments, in the pump system according to (5) above, the control device is one of the plurality of booster pumps in at least a high load zone in the plant where the pump system is provided. The plurality of booster pumps are configured to be controllable so as not to operate independently.

According to the pump system described in (6) above, it is possible to avoid independent operation of the booster pump in a high load zone where an overflow state of the booster pump is likely to occur, so that damage to the equipment due to cavitation can be effectively performed. It can be suppressed.

(7) In some embodiments, in the pump system according to (6) above, the control device is based on a batch operation signal for collectively starting or stopping the plurality of booster pumps. Includes a batch operation control unit configured to collectively start or stop booster pumps.

According to the pump system described in (7) above, the batch operation control unit starts or stops a plurality of booster pumps at the same time to suppress the occurrence of an overflow state of the booster pumps and to operate the operation. It is possible to reduce the operational burden on the staff.

(8) In some embodiments, in the pump system according to (6) or (7) above, the control device individually starts or stops the plurality of booster pumps in at least a high load zone in the plant. Includes an individual operation prohibition control unit configured to prohibit operations to be performed.

According to the pump system described in (8) above, by prohibiting the operation of individually starting or stopping the booster pump in the high load zone, the occurrence of an overflow state of the booster pump due to an erroneous operation by the operator is prevented. It can be suppressed.

(9) In some embodiments, in the pump system according to any one of (5) to (8) above, the control device includes the plurality of booster pumps in at least a high load zone in the plant. It includes an automatic stop control unit configured to automatically stop the remaining booster pumps when one of the plurality of booster pumps is stopped during operation.

According to the pump system described in (9) above, when one of the multiple booster pumps is stopped, the occurrence of an overflow state of the remaining booster pumps is suppressed and the burden on the operator is reduced. Can be planned.

(10) In some embodiments, in the pump system according to (9) above, the automatic stop control unit is based on a trip signal indicating that one of the plurality of booster pumps has tripped. It is configured to automatically stop the remaining booster pumps.

According to the pump system described in (10) above, when one of the multiple booster pumps is stopped during operation, the remaining booster pumps can be stopped promptly based on the trip signal, so that the remaining booster pumps can be stopped. It is possible to suppress the occurrence of an overflow state of the booster pump and reduce the burden on the operator.

(11) In some embodiments, in the pump system according to (9) or (10) above, in the automatic stop control unit, one of the plurality of booster pumps is urgently stopped by a manual operation. It is configured to automatically stop the remaining booster pumps based on an emergency stop signal indicating that it has done so.

According to the pump system described in (11) above, when one of the booster pumps is stopped during operation, the remaining booster pumps can be stopped promptly based on the emergency stop signal. It is possible to suppress the occurrence of an overflow state of the booster pump and reduce the burden on the operator.

(12) In some embodiments, in the pump system according to any one of (9) to (11) above, the automatic stop control unit includes one booster pump among the plurality of booster pumps. It is configured to automatically stop the remaining booster pumps based on a power supply voltage drop signal indicating that the power supply voltage of the one booster pump has fallen below the reference voltage.

According to the pump system described in (12) above, when one of the plurality of booster pumps is stopped during operation, the remaining booster pumps can be stopped promptly based on the power supply voltage drop signal. It is possible to suppress the occurrence of an overflow state of the remaining booster pumps and reduce the burden on the operator.

(13) In some embodiments, in the pump system according to any one of (9) to (12) above, the automatic stop control unit includes one booster pump out of the plurality of booster pumps. It is configured to automatically stop the remaining booster pumps based on a pump stop signal indicating that it has stopped.

According to the pump system described in (13) above, when one of the booster pumps is stopped during operation, the remaining booster pumps can be stopped promptly based on the pump stop signal. It is possible to suppress the occurrence of an overflow state of the booster pump and reduce the burden on the operator.

(14) The power plant according to at least one embodiment of the present invention includes the pump system according to any one of (1) to (13) above.

According to the power plant described in (14) above, by providing the pump system according to any one of (1) to (13) above, the flow rate of the pump system can be appropriately controlled and power generation can be performed. The plant can be operated stably.

(15) In the method of operating the pump system according to at least one embodiment of the present invention, the pump system includes a fluid line for flowing a fluid, a pressure loss device provided in the fluid line, and the said in the fluid line. At least one booster pump provided downstream of the pressure loss device and configured to boost the fluid to compensate for at least a portion of the pressure loss in the pressure loss device and the pressure loss in the fluid line. A bypass line that branches off from the fluid line on the upstream side of the device and joins the fluid line on the downstream side of the booster pump, a bypass valve provided on the bypass line, and the bypass valve in series with the bypass line. The operation method includes a check valve provided and configured to open and close by a front-rear differential pressure, and the operation method includes a pump operation step of operating the booster pump with the bypass valve open.

According to the operation method of the pump system described in (15) above, by operating the booster pump with the bypass valve open in the pump operation step, the fluid boosted by the booster pump during the operation of the booster pump is performed. It is possible to keep the check valve that opens and closes by the front-rear differential pressure in the closed state by utilizing the pressure of. Further, when the operation of the booster pump is stopped due to a failure or the like, the booster pump does not boost the fluid, so that the check valve switches to the open state due to the change in the front-rear differential pressure.

Therefore, as compared with the case where the above two lines are switched by manually opening and closing the bypass valve, it is possible to reduce the operational burden on the operator. Further, since the check valve can be quickly closed by the front-rear differential pressure of the check valve, the flow rate fluctuation can be suppressed and the flow rate can be appropriately controlled.

Further, since the operation of switching the opening / closing of the bypass valve is not required as described above, the erroneous operation of the bypass valve does not occur. Therefore, while improving the reliability of the pump system and the plants that use it, the check valve suppresses the occurrence of backflow to the bypass line due to the overflow state of the booster pump and manages the flow rate appropriately. be able to.

(16) In some embodiments, the method of operating the pump system according to (15) above further includes a bypass valve fully closing step that closes the bypass valve when a leak occurs in the check valve.

According to the operation method of the pump system described in (16) above, when a leak occurs in the check valve, the bypass valve is closed to enhance the effect of suppressing the backflow from the booster pump to the bypass line, and the booster pump. The occurrence of the overflow state can be effectively suppressed and the flow rate can be appropriately controlled.

(17) In the operation method of the pump system according to at least one embodiment of the present invention, the pump system is provided in a plurality of flow paths for flowing fluids provided in parallel and in the plurality of flow paths, respectively. A plurality of booster pumps are provided, and the operation method is caused by the fact that one booster pump among the plurality of booster pumps operates independently, and the flow rate of the one booster pump exceeds the rated flow rate. It is provided with an overflow suppression step for suppressing the occurrence of a flow rate state.

According to the pump system described in (17) above, the booster pump can be operated by suppressing the occurrence of an overflow state of the booster pump due to the operation of one booster pump independently in the overflow suppression step. It is possible to prevent the downstream equipment from being damaged due to cavitation.

According to at least one embodiment of the present invention, there is provided a pump system capable of appropriately controlling the flow rate, an operation method thereof, and a power plant.

It is a figure which shows the schematic structure of the nuclear power plant 100 which concerns on one Embodiment of this invention. It is a figure for demonstrating the use time of the desalting apparatus in the period from the start-up time to the stop-time of the nuclear power plant 100. It is a figure which shows the detailed structure of the pump system 16 which concerns on one Embodiment, and shows the open / closed state of each valve when the condensate desalting apparatus 30 is not used (during the normal operation of a nuclear power plant 100, etc.). It is a figure which shows the detailed structure of the pump system 16 which concerns on one Embodiment, and each of the case where the condensate desalting apparatus 30 is used (when the nuclear power plant 100 is started, stopped, and when the water quality deteriorates by seawater leakage, etc.) It shows the open / closed state of the valve. It is a figure which shows the detailed structure of the pump system 016 which concerns on the comparative form which the check valve is not provided, and opens and closes each valve when the condensate desalting apparatus 30 is not used (during normal operation of a nuclear power plant 100, etc.). Indicates the state. It is a figure which shows the detailed structure of the pump system 016 which concerns on the comparative form which the check valve is not provided, and when the condensate desalting apparatus 30 is used (when the nuclear power plant 100 is started, stopped, and due to seawater leakage. It shows the open / closed state of each valve when the water quality deteriorates. It is a figure which shows the state which one of the plurality of condensate booster pumps 32 tripped. It is a figure which shows the state which two condensate booster pumps 32 of a plurality of condensate booster pumps 32 tripped. It is a figure which shows the detailed structure of the pump system 16 which concerns on one Embodiment. It is a figure which shows an example of the work procedure of the operation operator which concerns on one Embodiment, and the control flow of the control device 46. It is a figure which shows an example of the screen of the touch panel 48 which concerns on one Embodiment. It is a figure which shows an example of the control flow of the control device 46 which concerns on one Embodiment. It is a figure which shows an example of the collective operation control flow by the collective operation control unit 52. It is a figure which shows an example of the screen which concerns on the collective control flow in the touch panel 48. It is a figure which shows an example of the erroneous operation prevention control flow by the individual operation prohibition control unit 54. It is a figure which shows an example of the screen which concerns on the erroneous operation prevention flow in touch panel 48. It is a figure which shows an example of the interlock control flow by an automatic stop control part.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. Absent.
For example, expressions that represent relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a state of relative displacement with tolerances or angles and distances to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the state of existence.
For example, an expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or chamfering within a range in which the same effect can be obtained. The shape including the part and the like shall also be represented.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions that exclude the existence of other components.

FIG. 1 is a diagram showing a schematic configuration of a nuclear power plant 100 according to an embodiment of the present invention.
The nuclear power plant 100 shown in FIG. 1 includes a steam generator 2, a high-pressure turbine 4, a moisture separation heater 6, a low-pressure turbine 8, a condenser 10, a plurality of condenser pumps 12, a ground steam condenser 14, and a pump system 16. , Valve 18, low-pressure feed water heater 20, deaerator 22, a plurality of feed pumps 24, and high-pressure feed water heater 26.

The steam generator 2 uses heat from a nuclear reactor (not shown) to generate steam. The steam generated by the steam generator 2 passes through the high-pressure turbine 4, the moisture separation heater 6, and the low-pressure turbine 8 in this order to drive the high-pressure turbine 4 and the low-pressure turbine 8. The high-pressure turbine 4 and the low-pressure turbine 8 are connected to a generator (not shown), and power is generated by the generator as the high-pressure turbine 4 and the low-pressure turbine 8 rotate.

The steam that has passed through the low-pressure turbine 8 exchanges heat with seawater in the condenser 10, condenses it, becomes condensed water, and is temporarily stored in the condenser 10. The condensate temporarily stored in the condensate 10 is boosted by a plurality of condensate pumps 12 provided in parallel, and is supplied to the pump system 16 through the ground steam condenser 14.

The pump system 16 includes a condensate demineralization line 28 (fluid line), a condensate desalination device 30 (pressure loss device), a plurality of condensate booster pumps 32, a bypass line 34, a bypass valve 36 and a check valve 38. ..

The condensate desalting device 30 is provided in the condensate desalting line 28, and is configured to desalt the condensed water (condensate) condensed by the condenser 10. In the condensate desalting apparatus 30, for example, the condensate is desalted with an ion exchange resin.

The condensate demineralization line 28 includes a plurality of flow paths 40 provided in parallel on the downstream side of the condensate desalination apparatus 30, and the plurality of condensate booster pumps 32 are provided in the plurality of flow paths 40, respectively. There is. In the illustrated exemplary embodiment, two condensate booster pumps 32 are provided in two parallel flow paths 40, respectively.

The plurality of condensate booster pumps 32 are configured to boost the condensate so that at least a portion of the pressure loss in the condensate desalting apparatus 30 is compensated.

The bypass line 34 branches from the condensate demineralization line 28 on the upstream side of the condensate demineralization device 30 in the condensate demineralization line 28 and joins the condensate demineralization line 28 on the downstream side of the condensate booster pump 32. It is configured as follows. That is, the bypass line 34 is configured to bypass the condensate desalting device 30 and the condensate booster pump 32.

The bypass valve 36 is provided in the bypass line 34, and is configured to be opened and closed at an arbitrary timing by a drive source such as a manual or a motor, even if there is no front-rear differential pressure of the bypass valve 36.

The check valve 38 is provided in series with the bypass valve 36 on the downstream side of the bypass valve 36 in the bypass line 34, and has a front-rear differential pressure (difference between the upstream side and the downstream side of the valve body not shown in the check valve 38). It is configured to open and close with pressure). Specifically, the check valve 38 is in the forward direction from the upstream side of the check valve 38 (the condenser 10 side in the condenser flow direction) to the downstream side (the low-pressure feed water heater 20 side in the condenser flow direction). It is configured to allow only flow to and not to flow in the opposite direction.

The condensate that has passed through the pump system 16 is heated by the low-pressure feed water heater 20 through the valve 18, and then flows into the deaerator 22. The condensate heated and degassed by the deaerator 22 is boosted by a plurality of feed water pumps 24 provided in parallel, heated by the high-pressure feed water heater 26, and then supplied to the steam generator 2.

Here, with reference to FIGS. 1 and 2, the time of use of the condensate desalting apparatus 30 during the period from the start to the stop of the nuclear power plant 100 will be described.
As shown in FIG. 2, when the nuclear power plant 100 is started, stopped, and when the water quality deteriorates due to seawater leakage, the condensate desalination device 30 is used to improve the water quality without using the bypass line 34. On the other hand, during normal operation of the nuclear power plant 100 (excluding when the water quality deteriorates), the bypass line 34 is used without using the condensate desalting device 30. Further, since the pump system 16 shown in FIG. 1 includes two condensate booster pumps 32 having the same configuration provided in parallel, in a high load zone of 50% or more of the load in the nuclear power plant 100 (see FIG. 2). , Both of the two condensate booster pumps 32 are operated so that the condensate booster pump 32 does not become overflowed so that the flow rate exceeds the rated flow rate.

The reason for using the condensate desalting device 30 when the nuclear power plant 100 is started and stopped is generally that when the nuclear power plant is started and stopped, the condenser is passed through a system that has not passed water for a long period of time. This is because there is inflowing water. Therefore, as described above, the condensate desalting device 30 is used to improve the water quality when the nuclear power plant 100 is started, stopped, and when the water quality deteriorates due to seawater leakage.

3 and 4 are views showing an example of a detailed configuration of the pump system 16. FIG. 3 shows the open / closed state of each valve when the condensate demineralizer 30 is not used (during normal operation of the nuclear power plant 100, etc.), and FIG. 4 shows the open / closed state when the condensate demineralizer 30 is used. The open / closed state of each valve (when the nuclear power plant 100 is started, stopped, and when the water quality deteriorates due to seawater leakage, etc.) is shown. In FIGS. 3 and 4, the symbol containing the two white triangles indicates that the valve is in the open state, and the symbol containing the two black triangles indicates that the valve is in the closed state. .. In the embodiment shown in FIGS. 3 and 4, a condensate inlet valve 42 is provided on the upstream side of the condensate desalting device 30 in the condensate desalting line 28, and a plurality of inlet valves 42 in the plurality of flow paths 40 are provided. A plurality of pump outlet valves 44 are provided on the downstream side of the condensate booster pump 32.

As shown in FIG. 3, during the normal operation of the nuclear power plant 100, since the bypass line 34 is used instead of the condensate desalting line 28, the condensate booster pump 32 is stopped and the pump outlet valve 44 Is closed. The desalination device inlet valve 42 and the bypass valve 36 are open regardless of whether or not the condensate desalination device 30 is used. Since there is no pressure difference between the downstream side and the upstream side of the check valve 38 while the condensate booster pump 32 is stopped, the check valve 38 is maintained in an open state by the condensate flow. Therefore, while the condensate booster pump 32 is stopped, the entire amount of condensate supplied from the condenser 10 to the pump system 16 is supplied to the low-pressure feed water heater 20 through the bypass line 34.

On the other hand, as shown in FIG. 4, when the nuclear power plant 100 is started, stopped, and when the water quality deteriorates due to seawater leakage, the condensate demineralization line 28 is used for improving the water quality without using the bypass line 34. , The condensate booster pump 32 is driven and the pump outlet valve 44 is fully opened. During the operation of the return water booster pump 32, the return water is boosted by the return water booster pump 32, and the pressure on the downstream side of the check valve 38 becomes sufficiently larger than the pressure on the upstream side of the check valve 38. The check valve 38 can be kept in the closed state by the front-rear differential pressure of the check valve 38. Therefore, during the operation of the condensate booster pump 32, the entire amount of condensate supplied from the condensate 10 to the pump system 16 is supplied to the low-pressure feed water heater 20 through the condensate desalting line 28. ..

According to the pump system 16 shown in FIGS. 3 and 4, the bypass valve 36 is always kept open regardless of the operating state of the condensate booster pump 32, so that the condensate booster pump 32 is restored during operation. By utilizing the pressure of the fluid boosted by the water booster pump 32, the check valve 38 that opens and closes by the front-rear differential pressure can be maintained in the closed state. Further, when the operation of the condensate booster pump 32 is stopped, the fluid is not boosted by the condensate booster pump 32 and the front-rear differential pressure of the check valve 38 disappears, so that the check valve 38 is switched to the open state.

Therefore, when the check valve 38 is not provided (as shown in FIGS. 5 and 6, when the bypass valve 36 is manually or manually opened / closed to switch between the two lines 28 and 34). In comparison, the operational burden on the operator can be reduced. Further, since the check valve 38 can be quickly closed by the front-rear differential pressure of the check valve 38, it is necessary to suppress the flow rate fluctuation when switching between the two lines 28 and 34 and manage the flow rate appropriately. Can be done.

For example, as shown in FIG. 7, when one of the plurality of condensate booster pumps 32 trips, if the remaining condensate booster pumps 32 are stopped promptly, the condensate booster pumps By opening the check valve 38 that was closed by the discharge pressure of 32, the line used can be quickly switched to the bypass line 34, and fluctuations in the condensate flow rate can be suppressed. Further, as shown in FIG. 8, even when all of the plurality of condensate booster pumps 32 trip at the same time, the check valve 38 closed by the discharge pressure of the condensate booster pump 32 opens, so that the check valve 38 can be quickly opened. The line used is switched to the bypass line 34, and fluctuations in the condensate flow rate can be suppressed. Therefore, the nuclear power plant 100 can be operated stably.

Further, since it is not necessary to open / close the bypass valve 36 to switch between the condensate desalting line and the bypass line 34, the operator does not erroneously operate the bypass valve 36. Therefore, the reliability of the pump system 16 and the nuclear power plant 100 using the pump system 16 is improved, and the check valve 38 suppresses the occurrence of backflow to the bypass line 34 due to the overflow state of the condensate booster pump 32. The flow rate can be appropriately controlled.

In one embodiment, the bypass valve 36 may be closed when a leak occurs in the check valve 38. As a result, the backflow from the condensate booster pump 32 to the bypass line 34 can be suppressed, and the occurrence of an overflow state of the condensate booster pump 32 can be suppressed.

In one embodiment, as shown in FIG. 9, the pump system 16 includes a control device 46 configured to be able to control the condensate booster pump 32 and a touch panel for operating the condensate booster pump 32 by an operator. 48 (operation unit) and a vapor pressure sensor 49 for measuring the inlet vapor pressure of the low-pressure turbine 8 (see FIG. 1) may be provided. The illustrated control device 46 includes an input interface 50, a batch operation control unit 52, an individual operation prohibition control unit 54, an automatic stop control unit 56, and an output interface 58.

FIG. 10 is a diagram showing an example of the work procedure of the operator and the control flow of the control device 46 according to the embodiment. FIG. 11 is a diagram showing an example of a screen of the touch panel 48 according to the embodiment.

As shown in FIG. 11, on the touch panel 48, icons P1 and P2 corresponding to each condensate booster pump 32 in the pump system 16 and icons V1 and V2 corresponding to each pump outlet valve 44 are displayed.

As shown in FIG. 10, first, in S11, the operator determines the operating status of the nuclear power plant 100. Specifically, it is determined whether the nuclear power plant 100 corresponds to when it is started, when it is stopped, or when the water quality deteriorates.

If it is determined in S11 that the nuclear power plant 100 is started, stopped, or the water quality deteriorates, the operator touches the icons P1 and P2 on the touch panel 48 shown in FIG. 11 in S12. Then, select "ON" from the normal command menus Mp1 and Mp2 displayed corresponding to each icon. As a result, in S13, the control device 46 activates each condensate booster pump 32, and in S14, the control device 46 fully opens each pump outlet valve 44.

In S11, when the operator determines that the nuclear power plant 100 is in normal operation, in S15, the operator touches the icons P1 and P2 on the touch panel 48 shown in FIG. 11 to correspond to each icon. Select "OFF" from the normal command menus Mp1 and Mp2 displayed in the above. As a result, in S16, the control device 46 fully closes each pump outlet valve 44, and in S17, the control device 46 stops each condensate booster pump 32.

FIG. 12 is a diagram showing an example of a control flow of the control device 46 according to the embodiment. The control device 46 is an overflow rate in which the flow rate of the one condensate booster pump 32 exceeds the rated flow rate due to the fact that one of the plurality of condensate booster pumps 32 operates independently. It is configured to suppress the occurrence of conditions. As described in detail below, the control device 46 performs batch operation control by the batch operation control unit 52 in S21, erroneous operation prevention control by the individual operation prohibition control unit 54 in S22, and automatic stop control unit 56 in S23. Perform interlock control. However, the order of each control is not particularly limited, and each control of S21 to S23 can be performed independently. The contents of each control will be described below.

FIG. 13 is a diagram showing an example of a batch operation control flow by the batch operation control unit 52. FIG. 14 is a diagram showing an example of a screen related to a batch control flow on the touch panel 48.

As shown in FIG. 13, first, in S31, it is determined whether or not the "ALL" button on the screen shown in FIG. 14 is pressed.

When the "ALL" button is pressed in S31, it is determined in S32 whether or not the "ALL START" button in the batch command menu Mp3 of the screen shown in FIG. 14 is pressed. In one embodiment, when the "ALL START" button is pressed, a batch operation signal for collectively starting a plurality of condensate booster pumps 32 at the same time is input from the touch panel 48 to the input interface 50 of the control device 46. It is determined that the "ALL START" button has been pressed based on the batch operation signal. On the other hand, when the "ALL STOP" button is pressed, a batch operation signal for stopping the plurality of condensate booster pumps 32 at the same time is input from the touch panel 48 to the input interface 50 of the control device 46, and the batch operation signal is input. It is determined that the "ALL STOP" button has been pressed based on.

When it is determined that the "ALL START" button has been pressed in S32, the batch operation control unit 52 collectively activates a plurality of condensate booster pumps 32 in S33 via the output interface 58, and in S34. The plurality of pump outlet valves 44 are collectively fully opened at the same time.

If it is determined in S31 that the "ALL" button has not been pressed, the process returns to the start. If it is determined in S32 that the "ALL START" button has not been pressed (when the "ALL STOP" button has been pressed), the batch operation control unit 52 has a plurality of pumps in S35 via the output interface 58. The outlet valves 44 are fully closed at the same time, and the plurality of condensate booster pumps 32 are stopped at the same time in S36.

In this way, by collectively starting or stopping the plurality of condensate booster pumps 32 at the same time by the collective operation control unit 52, one of the plurality of condensate booster pumps 32 can be used independently. It is possible to suppress the occurrence of an overflow state in which the flow rate of the one condensate booster pump 32 exceeds the rated flow rate due to operation. Further, as compared with the case where the plurality of condensate booster pumps 32 are individually started or stopped, it is possible to reduce the operational burden on the operator.

FIG. 15 is a diagram showing an example of an erroneous operation prevention control flow by the individual operation prohibition control unit 54. FIG. 16 is a diagram showing an example of a screen related to an erroneous operation prevention flow in the touch panel 48.

As shown in FIG. 15, first, in S41, it is determined whether or not the nuclear power plant 100 is operating in the high load zone. When it is determined in S41 that the nuclear power plant 100 is operating in the high load zone, in S42, the individual operation prohibition control unit 54 individually starts or stops the plurality of condensate booster pumps 32. Invalidate or prohibit. In S43, when the operator operates the icon P1 or P2 on the screen of the touch panel 48 shown in FIG. 16, the limited command menu Mp4 or MP5 is displayed for the condensate booster pump 32 corresponding to the icon P1 or P2. In the limited command menus Mp4 and Mp5, it is not possible to operate the "ON" button for starting each condensate booster pump 32 individually and the "OFF" button for stopping each condensate booster pump 32 individually. , Only the "OFFLOCK" button, which is an emergency stop button of each condensate booster pump 32, can be operated.

When it is determined in S41 that the nuclear power plant 100 is not operating in the high load zone, in S44, the individual operation prohibition control unit 54 individually starts or stops the plurality of condensate booster pumps 32. Activate. In S45, when the operator operates the icon P1 or P2 on the screen of the touch panel 48 shown in FIG. 16, the normal command menu Mp1 or MP2 (see FIG. 14) is displayed for the condensate booster pump 32 corresponding to the icon P1 or P2. Is displayed. In the normal command menus Mp1 and Mp2, all of the above-mentioned "ON" button, "OFF" button, and "OFFLOCK" button can be operated.

In this way, the individual operation prohibition control unit 54 prohibits the operation of individually starting or stopping each condensate booster pump 32 in at least the high load zone, so that the condensate booster pump 32 caused by an erroneous operation by the operator It is possible to suppress the occurrence of an overflow state. In the above control flow, the limited command menus Mp4 and MP5 are displayed so that the condensate booster pumps 32 cannot be started or stopped individually in the high load zone of the nuclear power plant 100. In the high load band of 100, the normal command menus Mp1 and Mp2 may be displayed, and even if a button for individually operating each condensate booster pump 32 is pressed, the signal of the operation may not be received.

FIG. 17 is a diagram showing an example of an interlock control flow by the automatic stop control unit 56.
As shown in FIG. 17, first, in S51, it is determined whether or not the nuclear power plant 100 is operating in the high load zone. When it is determined in S51 that the nuclear power plant 100 is operating in the high load zone, a trip indicating that one of the plurality of condensate booster pumps 32 has tripped in S52. It is determined whether or not the signal is received from the condensate booster pump 32. When it is determined that the trip signal has been received in S52, the automatic stop control unit 56 automatically stops the remaining condensate booster pump 32 in S56.

If it is not determined that the trip signal has been received in S52, the touch panel 48 displays an emergency stop signal indicating that one of the plurality of condensate booster pumps 32 has been urgently stopped by manual operation in S53. Determine if it was received from. When it is determined that the emergency stop signal has been received in S53, the automatic stop control unit 56 automatically stops the remaining condensate booster pump 32 in S56.

If it is not determined in S53 that an emergency stop signal has been received, the power supply voltage (bus voltage) of one of the plurality of condensate booster pumps 32 has fallen below the reference voltage in S54. It is determined whether or not the power supply voltage drop signal indicating the above is received from the condensate booster pump 32. When it is determined in S54 that the power supply voltage drop signal has been received, the automatic stop control unit 56 automatically stops the remaining condensate booster pump 32 in S56.

If it is not determined that the power supply voltage drop signal has been received in S54, the pump stop signal indicating that one of the plurality of condensate booster pumps 32 has stopped for some reason is restored in S55. It is determined whether or not the signal is received from the water booster pump 32. When it is determined in S55 that the pump stop signal has been received, the automatic stop control unit 56 automatically stops the remaining condensate booster pump 32 in S56.

Regarding the pump stop signal, for example, the rotation speed of the condensate booster pump 32 is monitored by a rotation speed meter (not shown), and when the rotation speed measured by the rotation speed meter falls below the reference value, the rotation speed meter is used. The pump stop signal may be transmitted to the control device 46.

Further, in one embodiment, a threshold value (allowable time) is set for the detection time of the pump stop signal, and when the pump stop signal is continuously received for a longer time than the threshold value in S54, the automatic stop control unit 56 in S56 The remaining condensate booster pump 32 may be automatically stopped. In this case, the threshold value may be determined in consideration of the pump design requirement value.

In S57, an alarm indicating that a command for automatically stopping the remaining condensate booster pumps (residual machines) 32 among the plurality of condensate booster pumps 32 has been issued is transmitted.

In this way, when one unit stops during the operation of the plurality of condensate booster pumps 32, the automatic stop control unit 56 performs interlock control to automatically stop the remaining condensate booster pumps 32, thereby performing the remaining It is possible to suppress the occurrence of an overflow state of the condensate booster pump 32 and reduce the burden on the operator.

Further, since the determination shown in S52 to S54 is performed before determining whether or not the pump stop signal indicating that the condensate booster pump 32 has actually stopped is received in S55, the condensate is restored. The remaining condensate booster pump 32 can be automatically stopped earlier than the booster pump 32 actually stops, and the occurrence of the overflow state can be effectively suppressed.

In S41 and S51, for example, when the inlet vapor pressure of the low-pressure turbine 8 measured by the vapor pressure sensor 49 (see FIG. 9) is higher than the threshold value, the nuclear power plant 100 operates in the high load zone. If it is lower than the threshold value, it may be determined that the nuclear power plant 100 is operating in the low load zone.

Further, when the nuclear power plant 100 is started, the drain collected by the condenser 10 increases the condensate flow rate as compared with the normal operation. Therefore, even when the nuclear power plant 100 is started, the condensate flow rate is large. If the threshold value of the inlet steam pressure is set so as to avoid the occurrence of the overflow of the water booster pump 32, the occurrence of the overflow of the condensate booster pump 32 can be avoided from the start to the stop of the nuclear power plant 100. be able to. For example, in the pump system 16 described above, a pressure level corresponding to a load of 20% to 40% of the turbine output may be set to the threshold value.

The present invention is not limited to the above-described embodiment, and includes a modification of the above-described embodiment and a combination of these embodiments as appropriate.

For example, in the above-described embodiment, the pump system 16 has been described by taking the nuclear power plant 100 as an example, but the pump system 16 can be applied not only to the nuclear power plant but also to a thermal power plant, a plant such as a factory, and the like. ..

2 Steam generator 4 High pressure turbine 6 Moisture separation heater 8 Low pressure turbine 10 Condenser 12 Condenser pump 14 Ground steam condenser 16 Pump system 18 Valve 20 Low pressure water supply heater 22 Deaerator 24 Water supply pump 26 High pressure water supply heater 28 Condenser demineralization line 30 Condenser demineralizer 32 Condenser booster pump 34 Bypass line 36 Bypass valve 38 Check valve 40 Flow path 42 Condenser inlet valve 44 Pump outlet valve 46 Control device 48 Touch panel 49 Steam pressure sensor 50 Input interface 52 Collective operation control unit 54 Individual operation prohibition control unit 56 Automatic stop control unit 58 Output interface 60 Condenser pipe 62 Drain pipe 100 Plant 100 Nuclear plant Mp1, Mp2 Normal command menu Mp3 Batch command menu Mp4, Mp5 Limited command menu P1, P2, V1, V2 icons

Claims (6)

A fluid line for flowing fluid and
The pressure loss device provided in the fluid line and
At least one booster pump provided downstream of the pressure drop device in the fluid line and configured to boost the fluid so as to compensate for at least a portion of the pressure drop in the pressure drop device.
A bypass line that branches off from the fluid line on the upstream side of the pressure loss device in the fluid line and joins the fluid line on the downstream side of the booster pump.
A bypass valve provided on the bypass line and configured to be opened and closed manually or by a drive source.
A check valve provided in the bypass line in series with the bypass valve and on the downstream side of the bypass valve and configured to open and close by a front-rear differential pressure.
Equipped with a,
A pump system configured such that during operation of the booster pump, the pressure of the fluid boosted by the booster pump is transmitted to the check valve without passing through the pressure loss device . The pump system according to claim 1, wherein the pressure loss device is a condensate desalting device that desalinates condensate condensate with a condenser. The fluid line includes a plurality of flow paths provided in parallel on the downstream side of the pressure loss device.
The pump system according to any one of claims 1 or 2 , wherein the at least one booster pump includes a plurality of booster pumps provided in the plurality of flow paths, respectively. A power plant comprising the pump system according to any one of claims 1 to 3 . How to operate the pump system
The pump system
A fluid line for flowing fluid and
The pressure loss device provided in the fluid line and
At least one booster pump provided downstream of the pressure drop device in the fluid line and configured to boost the fluid so as to compensate for at least a portion of the pressure drop in the pressure drop device.
A bypass line that branches off from the fluid line on the upstream side of the pressure loss device in the fluid line and joins the fluid line on the downstream side of the booster pump.
A bypass valve provided on the bypass line
A check valve provided in the bypass line in series with the bypass valve and on the downstream side of the bypass valve and configured to open and close by a front-rear differential pressure.
With
During the operation of the booster pump, the pressure of the fluid boosted by the booster pump is transmitted to the check valve without passing through the pressure loss device.
The operation method is an operation method of a pump system including a pump operation step for operating the booster pump with the bypass valve open. The method of operating a pump system according to claim 5 , further comprising a bypass valve fully closing step of closing the bypass valve when a leak occurs in the check valve.

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