JP5982192B2 - Condensate water supply control device and condensate water supply cycle system - Google Patents

Description

  Embodiments described herein relate generally to a condensate water supply control device and a condensate water supply cycle system.

  In a thermal power plant, steam is generated by a steam generation drum of a boiler, a steam turbine is driven to generate power by a generator, steam discharged from the steam turbine is cooled by a condenser, and condensed condensate is recovered. A condensate water supply cycle system is employed in which the pressure is increased by a condensate pump and then further increased by a boiler feed pump to supply water to a steam generating drum.

  In such a condensate water supply cycle system, as a condensate pump and a boiler feed water pump, in addition to a pump for normal operation, a spare is provided in case an operating condensate pump stops abnormally for some reason. For example, if the condensate pump in operation stops abnormally, the condensate water supply cycle system is continuously operated by the backup start of the condensate pump that is in standby stop. Yes.

FIG. 8 is a block diagram illustrating an example of a conventional condensate water supply cycle system.
The condensate water supply cycle system shown in FIG. 8 includes a steam turbine 100, a condenser 110, a condensate pump 1, a heat exchanger 3, a boiler feed water pump 4, a steam generation drum feed water control valve V5, and a boiler. 120.

The steam turbine 100 converts the thermal energy of the steam into rotational energy for rotating a generator (not shown).
The condenser 110 cools the steam exhausted from the steam turbine 100 and returns it to water.
The condensate pump 1 is configured by connecting two units (1a, 1b) in parallel, and boosts the pressure of water supplied from the condenser 110 to a first pressure. The discharge pressure of the condensate pump 1 is measured by a pressure gauge PG1.

  The heat exchanger 3 raises the temperature of the water supplied from the condensate pump 1 by heat exchange and raises the pressure.

  The boiler feed pump 4 is configured by connecting two units (4a, 4b) in parallel, and exceeds the pressure of the water supplied from the condensate pump 1 via the heat exchanger 3 above. The pressure is increased to the second pressure and supplied to the boiler 120. Pressure gauges PG4a and PG4b are provided at the suction ports of the boiler feed pumps 4a and 4b, and the pressure by the hydrostatic head from the condenser 110 to the condensate pump 1 is increased by the condensate pump 1 and the heat exchanger 3. The sum of the condensate pressure is measured immediately before suction of the boiler feed pumps 4a and 4b by pressure gauges PG4a and PG4b provided in the boiler feed pumps 4a and 4b, respectively.

  The steam generation drum water supply control valve V5 adjusts the amount of water supplied from the boiler water supply pump 4 to the boiler 120.

  The boiler 120 includes a steam generating drum 6. The steam generating drum 6 generates steam by reducing the pressure of the water supplied from the boiler feed water pump 4 and supplies the steam to the steam turbine 100, thereby driving the steam turbine 100. The steam generation drum 6 is provided with a water level gauge WG and a pressure gauge PG6. In the condensate water supply cycle system shown in FIG. 8, a water storage tank such as a deaerator is not provided between the condensate pump 1 and the boiler feed water pump 4.

  In the condensate water supply cycle system shown in FIG. 8, for example, when the condensate pump 1 a is in operation, when the condensate pump 1 b that is in a standby state is abnormally stopped due to some cause, the condensate pump 1 b that is in standby stop is activated as a backup, thereby Has come to continue operation.

  However, the suction pressure of the boiler feed pump 4 loses the discharge pressure from the condensate pump 1 in a transient state from the abnormal stop of the operating condensate pump 1a to the backup start of the condensing pump 1b in standby stop. The amount of water stored in the condenser 110 and the hydrostatic head of the pipe head from the outlet of the condenser 110 to the inlet of the boiler feed pump 4 will depend. Since the boiler feed water pump 4 is operated in such a critical state, the boiler feed water system 4 is continuously operated while controlling the feed water amount by the steam generation drum feed water control valve V5.

  In such a transient state, if the suction pressure of the boiler feed pump 4 becomes unstable due to the pressure and temperature balance in the piping being broken due to some factor, the boiler feed pump 4 is stopped by its own device protection function. Further, in the worst case, there is a concern that the pump impeller may be damaged due to the generation of bubbles in the boiler feed pump 4, and this is not a preferable operating state for the operation of the condensate feed water cycle system. .

  In FIG. 8, the boiler feed pump 4 is also made redundant (boiler feed pumps 4a and 4b). For example, under a state where the suction pressure of the boiler feed pump 4a is unstable, after the protection stop or the accident stop Even if the other boiler feed pump 4b is started by the complementary operation and is continuously operated, the protection stop or the accident stop is similarly performed.

JP 09-145893 A

  The problem to be solved by the present invention is a condensate water supply control device that is used in a condensate water supply cycle system and that can avoid continuous operation of a boiler feed water pump when the suction pressure is unstable, and such condensate water supply A condensate water supply cycle system including a control device is provided.

  The condensate water supply control device of the embodiment condenses the steam exhausted from the steam turbine with a condenser, supplies the water boosted by the condensate pump and the boiler feed water pump to the steam generation drum, and generates steam. It is used in a condensate water supply cycle system that generates and supplies the steam turbine. The condensate water supply control device forcibly stops the boiler water pump when the condensing pump being operated out of the condensate pumps stops abnormally, and the suction pressure of the boiler water pump is stabilized. After that, the forcibly stopped boiler feed water pump is restarted.

The block diagram which shows schematic structure of a condensate water supply cycle system provided with the condensate water supply control apparatus by Embodiment 1. FIG. The figure explaining an example of the function of the condensate water supply control apparatus shown in FIG. The flowchart which illustrates the specific procedure of the control method of the condensate water supply cycle system using the condensate water supply control apparatus shown in FIG. The block diagram which shows schematic structure of a condensate water supply cycle system provided with the condensate water supply control apparatus by Embodiment 2. FIG. The flowchart which illustrates the specific procedure of the control method of the condensate water supply cycle system using the condensate water supply control apparatus shown in FIG. The block diagram which shows schematic structure of a condensate water supply cycle system provided with the condensate water supply control apparatus by Embodiment 3. FIG. The flowchart which illustrates the specific procedure of the control method of the condensate water supply cycle system using the condensate water supply control apparatus shown in FIG. The block diagram which shows an example of the condensate water supply cycle system by a prior art.

  Hereinafter, some embodiments will be described with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals, and redundant description thereof is omitted as appropriate. 1, 2, 4, 6, and 8, hatched lines indicate elements that are stopped or stopped for some reason.

(1) Embodiment 1
FIG. 1 is a block diagram illustrating a schematic configuration of a condensate water supply cycle system including a condensate water supply control device according to a first embodiment. In the condensate water supply cycle system of the present embodiment, in addition to the configuration shown in FIG. 8, the boiler feed water pump 4 is forcibly temporarily stopped in response to an abnormal stop of the condensate pump 1 and the suction pressure of the boiler feed water pump 4 is established. A condensate water supply control device 130 is provided for restarting the boiler water pump 4 that has been temporarily stopped after the operation.

  The condensate water supply control device 130 includes a discharge pressure monitoring circuit 15, a suction pressure monitoring circuit 16, a condensate pump backup start command circuit 11, a boiler feed pump temporary forced stop circuit 12, and a boiler feed pump restart command circuit 14. A control computer 10 and a monitor 18.

  The discharge pressure monitoring circuit 15 is connected to a pressure gauge PG1 installed between the condensate pump 1 and the heat exchanger 3, and given measurement data of the discharge pressure of the condensate pump 1, the condensate pump 1 is abnormal. Detect if there was a stop.

  The control computer 10 receives a detection result from the discharge pressure monitoring circuit 15 that the operating condensate pump 1, for example, the condensing pump 1a, has stopped abnormally, and a control signal S1 for temporarily stopping the boiler feed pump 4 Is supplied to the boiler feed pump temporary forced stop circuit 12. Thereby, the boiler feed pump temporary forced stop circuit 12 produces | generates the boiler feed pump temporary forced stop signal S2, and sends it to the operating boiler feed pump 4a. Thereby, as shown in FIG. 2, the boiler feed pump 4a in operation is forcibly stopped temporarily.

  The control computer 10 also generates a control signal S3 for starting up the condensate pump 1b and sends it to the condensate pump backup start command circuit 11. As a result, the condensate pump backup start command circuit 11 generates a condensate pump backup start command signal S4 and sends it to the condensate pump 1b. As a result, as shown in FIG. Instead, the standby condensate pump 1b is activated to start operation. In this embodiment, the condensate pump backup activation command circuit 11 corresponds to, for example, a condensate pump backup activation unit.

  Returning to FIG. 1, the suction pressure monitoring circuit 16 is connected to the pressure gauges PG4a and PG4b provided at the suction ports of the boiler feed pumps 4a and 4b, respectively, and is given measurement data of the respective suction pressures. Whether or not the suction pressure is stabilized is monitored while the boiler feed pump 4a is temporarily stopped. If it is determined that the suction pressure of the boiler feed pump 4a or 4b is stable, the determination result is supplied to the control computer 10. In the present embodiment, the suction pressure monitoring circuit 16 corresponds to, for example, a suction pressure monitoring circuit.

  When receiving the determination result that the suction pressure of the boiler feed pump 4a or 4b is stabilized from the suction pressure monitoring circuit 16, the control computer 10 generates a control signal S4 for resuming the operation of the boiler feed pump 4 to generate the boiler. This is sent to the feed pump restart command circuit 14. The boiler feed pump restart command circuit 14 receives a control signal S4 from the control computer 10, generates a restart command signal S5, and supplies it to the boiler feed pump 4a. Thereby, the boiler feed pump 4a that has been temporarily stopped starts operation again. In the present embodiment, the boiler feedwater pump temporary forced stop circuit 12 corresponds to, for example, a boiler feedwater pump temporary forced stop means, and the boiler feedwater pump restart command circuit 14 corresponds to, for example, a boiler feedwater pump restart means.

  A condensate water supply cycle system control method using the condensate water supply control device 130 according to the present embodiment will be described with reference to the flowchart of FIG.

  First, when there is an abnormal stop in the operating condensate pump 1, for example, the condensate pump 1a (step S1), the discharge pressure monitoring circuit 15 detects this. Receiving the detection result from the discharge pressure monitoring circuit 15, the control computer 10 generates a control signal S1 and sends it to the condensate pump backup start command circuit 11, and generates a condensate pump backup start command signal S4 to generate the condensate pump 1b. To supply. Thereby, the condensing pump 1b in standby is activated to start operation (step S2).

  The control computer 10 generates a control signal S1 and sends it to the boiler feed pump temporary forced stop circuit 12 almost simultaneously with the condensate pump backup start command, and generates a boiler feed pump temporary forced stop signal S2 to operate the boiler feed water during operation. Supply to pump 4a. Thereby, the boiler feed pump 4a in operation is forcibly stopped temporarily (step S3).

  Thereafter, it is determined by the discharge pressure monitoring circuit 15 that the discharge pressure of the condensate pump 1b has recovered and stabilized (step S4), and further, the suction pressure of the boiler feed pump 4a is recovered and stabilized by the suction pressure monitoring circuit 16 If it determines with having performed (step S5), the boiler feed pump restart command circuit 14 will generate the restart command signal S5 based on control signal S4 from the control computer 10, and will supply it to the boiler feed pump 4a. Thereby, the boiler feed pump 4a that has been temporarily stopped starts operation again (step S6).

  If the boiler feed pump 4 is protected or accidentally stopped, the water supply to the steam generating drum 6 is stopped, which makes it impossible to continue the operation of the condensate water supply cycle system. This leads to stopping the power generation operation continuation.

  In order to avoid the continuous operation of the boiler feed pump 4 while the suction pressure is unstable, the condensate pump 1b in standby stop is backed up from the abnormal stop of the operating condensate pump 1a. It is necessary to shorten the time of the transient state until it is done as much as possible. However, the transient state time is prolonged due to some secondary factors such as delay in backup start-up operation due to electrical factors, pump motor malfunction, and other external factors that cannot secure the suction pressure of the boiler feed pump 4. In this case, continuation of operation under an unstable state of the boiler feed pump 4 cannot be avoided.

  According to this embodiment, the boiler feed water pump 4 is temporarily stopped when the condensate pump 1 enters a transient state before the boiler feed water pump 4 is protected or accidentally stopped. It is possible to fundamentally avoid the continuous operation of the boiler feed pump 4.

(2) Embodiment 2
FIG. 4 is a block diagram illustrating a schematic configuration of a condensate water supply cycle system including the condensate water supply control device according to the second embodiment. As apparent from comparison with FIG. 1, this embodiment includes a condensate water supply control device 132 including a time monitoring circuit 21 and a drum level monitoring circuit 23 instead of the condensate water supply control device 130 in the first embodiment. The other configuration is substantially the same as the condensate water supply cycle system shown in FIG.

  In the first embodiment described above, the boiler feed pump 4 is temporarily stopped when the condensate pump 1 is in a transient state. However, the boiler 120 operates while the boiler feed pump 4 is stopped. The steam is generated from the water in the steam generating drum 6. Therefore, there is naturally a limit that allows the boiler feed pump 4 to be stopped. If the boiler feed pump 4 is not released even if it falls below the permissible water level of the steam generating drum 6, there is a risk of emptying the boiler 120. Will lead to a serious situation. Therefore, in the present embodiment, the steam generation drum 6 is prevented from exceeding the allowable limit by the time monitoring by the timer TM and the monitoring by the water level of the steam generation drum 6.

  As shown in FIG. 4, the time monitoring circuit 21 includes a timer TM and is connected to the control computer 10. When the discharge pressure monitoring circuit 15 detects that the operating condensate pump 1a has stopped abnormally, the time monitoring circuit 21 receives the detection result via the control computer 10 and starts the timer TM from that point. . In the timer TM, a time THT until the steam generating drum 6 exceeds the allowable limit is set in advance, and when the time THT is counted from the abnormal stop of the condensate pump 1a, the time monitoring circuit 21 outputs a warning signal AL1. Is generated and supplied to the control computer 10. In the present embodiment, the time monitoring circuit 21 corresponds to, for example, time monitoring means, and the warning signal AL1 corresponds to, for example, a first alarm signal.

  The drum level monitoring circuit 23 is connected to the water level gauge WG provided in the steam generating drum 6 in addition to the control computer 10 and receives the measurement result of the water level gauge WG. When the discharge pressure monitoring circuit 15 detects that the operating condensate pump 1a has stopped abnormally, the drum level monitoring circuit 23, like the time monitoring circuit 21, detects the detection result via the control computer 10. Then, the allowable water level of the steam generating drum 6 set in advance from that time is compared with the measurement result of the water level gauge WG. When the measurement result of the water level gauge WG falls below the allowable water level of the steam generating drum 6, the drum level monitoring circuit 23 generates a warning signal AL2 and supplies it to the control computer 10. In the present embodiment, the drum level monitoring circuit 23 corresponds to, for example, a water level monitoring unit, and the warning signal AL2 corresponds to, for example, a second alarm signal.

  When the control computer 10 receives the warning signal AL1 or the warning signal AL2 from the time monitoring circuit 21 or the drum level monitoring circuit 23 before generating the control signal S4 for resuming the operation of the boiler feed pump 4, the control computer S8 Is generated and supplied to the boiler feed pump restart command circuit 14 to stop the restart sequence of the boiler feed pump 4a, and the warning signal AL3 is generated and supplied to the display 18 to restart the boiler feed pump 4 Display that waiting has been released. As a result, the operator can quickly shift to an operation other than the automatic operation. In the present embodiment, the control computer 10 corresponds to control means, for example.

  A condensate water supply cycle system control method using the condensate water supply control device 132 according to the present embodiment will be described with reference to the flowchart of FIG.

  First, when there is an abnormal stop in the operating condensate pump 1a (step S11), the discharge pressure monitoring circuit 15 detects this as in the first embodiment, and the condensate pump via the control computer 10 is detected. Under the control of the backup activation command circuit 11, the standby condensing pump 1b is activated to start operation (step S12). At almost the same time, the boiler feed pump 4a in operation is forcibly stopped by the control of the boiler feed pump temporary forced stop circuit 12 via the control computer 10. (Step S13).

  When the condensing pump 1b in standby is activated, the control computer 10 generates the trigger signals TS1 and TS2 and supplies them to the time monitoring circuit 21 and the drum level monitoring circuit 23, whereby the time monitoring by the time monitoring circuit 21 is performed. The drum level monitoring circuit 23 starts monitoring the drum level (step S14).

  Thereafter, as long as the set time does not exceed (No in Step S15, No in S25), or the measurement result of the water level gauge WG does not fall below the allowable water level of the steam generating drum 6 (No in Step S16, No in S26), As in the first embodiment, the determination of the discharge pressure of the condensate pump 1b by the discharge pressure monitoring circuit 15 (step S24), and the determination of the suction pressure of the boiler feed pump 4a by the suction pressure monitoring circuit 16 (step S35). Then, under the control of the boiler feed pump restart command circuit 14 via the control computer 10, the boiler feed pump 4a that has been temporarily stopped starts operating again (step S36).

  However, it is determined that the set time has been exceeded by the time monitoring circuit 21 from the temporary forced stop to the restart of the boiler feed pump 4a (Yes in Step S15, Yes in S25), or the measurement result of the water level gauge WG is When it is determined that the allowable water level of the steam generating drum 6 is below (Yes in Step S16, Yes in S26), the control computer 10 that has received the warning signal AL1 or the warning signal AL2 performs the restart sequence of the boiler feed pump 4a. Then, the warning signal AL3 is supplied to the display 18 to display that the waiting for the restart operation of the boiler feed pump 4 has been released (step S27). As a result, the operator can quickly shift to an operation other than the automatic operation. In this case, the operation of the boiler feed pump 4a is not automatically resumed.

  According to the present embodiment, the time monitoring circuit 21 prevents the boiler feed pump 4 from stopping beyond the allowable limit of the steam generating drum 6, and the drum level monitoring circuit 23 before the boiler feed pump 4 a is restarted. In addition, since the water level of the steam generating drum 6 is prevented from falling below the allowable water level, it is possible to reliably prevent a situation in which the continuous operation of the condensate water supply cycle system becomes impossible.

  In the above description, the case where the condensate water supply cycle system includes both the time monitoring circuit 21 and the drum level monitoring circuit 23 has been described. However, the present invention is not limited to this, and only one of the time monitoring circuit 21 and the drum level monitoring circuit 23 is provided. Only one of monitoring and drum level monitoring may be performed.

(3) Embodiment 3
FIG. 6 is a block diagram illustrating a schematic configuration of a condensate water supply cycle system including the condensate water supply control device according to the third embodiment. As is clear from comparison with FIG. 1, this embodiment includes a drum inflow amount setting value switching circuit 25 and a drum water supply control valve upper limit opening degree switching circuit 27 instead of the condensate water supply control device 130 in the first embodiment. A condensate water supply control device 134 is provided. The other structure of the condensate water supply system of this embodiment is substantially the same as the condensate water supply cycle system shown in FIG.

  According to the sequence of the first or second embodiment described above, the steam generation drum 6 continues to generate steam even after the boiler feed pump 4a is forcibly temporarily stopped. Immediately after is restarted, the water level of the steam generating drum 6 is lower than when the forced stop is performed. When a normal water supply operation to the boiler 120 is performed in this state, the steam generation drum water supply control valve V5 performs unlimited water supply to the steam generation drum 6 in order to restore the level of the steam generation drum 6. If this is left unattended, there is a risk that the boiler feed pump 4a will immediately become an overflow operation, in which case an excessive load will be applied to the steam generating drum 6.

  Therefore, the condensate water supply cycle system of the present embodiment receives a temporary forced stop of the boiler feed pump 4a by the drum inflow amount setting value switching circuit 25 connected to the control computer 10 and the steam generation drum water supply control valve V5. The level control set value for water supply control to the generation drum 6 is switched to the actual level, and the steam generation drum water supply control valve V5 is operated by tracking. Therefore, the drum inflow set value switching circuit 25 is also connected to the pressure gauge PG6 of the steam generating drum 6, is pressure data in the steam generating drum 6 sent, and is the water supply state by the boiler feed pump 4a in a steady state? Determine if. The condensate water supply cycle system of the present embodiment also has an upper limit opening degree of the steam generation drum water supply control valve V5 by the drum water supply control valve upper limit opening degree switching circuit 27 connected to the control computer 10 and the steam generation drum water supply control valve V5. Is set to a feed water flow rate restriction opening degree derived from the water level in the steam generating drum 6. Therefore, the drum water supply control valve upper limit opening degree switching circuit 27 is also connected to the pressure gauge PG6 of the steam generating drum 6, and the pressure data in the steam generating drum 6 is sent so that the water supply state by the boiler water supply pump 4a is in a steady state. Determine if it exists.

  The drum inflow set value switching circuit 25 and the drum water supply control valve upper limit opening switching circuit 27 further set the above settings for the steam generation drum water supply control valve V5 for a predetermined time even after the boiler water pump 4a is restarted. When it is confirmed that the water supply state by the boiler water supply pump 4a after resumption has shifted to the steady state, the setting of the steam generation drum water supply control valve V5 is switched to the normal level and the normal opening, respectively. In the present embodiment, the drum inflow amount set value switching circuit 25 and the drum water supply control valve upper limit opening degree switching circuit 27 correspond to, for example, a water supply amount control means.

  A condensate water supply cycle system control method using the condensate water supply control device 134 according to the present embodiment will be described with reference to the flowchart of FIG.

  First, when there is an abnormal stop in the operating condensate pump 1a (step S41), the discharge pressure monitoring circuit 15 detects this, and the condensate pump via the control computer 10 as in the first embodiment described above. Under the control of the backup activation command circuit 11, the standby condensing pump 1b is activated to start operation (step S42). At almost the same time, the boiler feed pump 4a in operation is forcibly stopped by the control of the boiler feed pump temporary forced stop circuit 12 via the control computer 10. (Step S43).

  Next, the drum inflow set value switching circuit 25 and the drum water supply control valve upper limit opening switching circuit 27 receive the notification from the control computer 10 that the boiler feed pump 4a has been forcibly suspended, and control signals S6 and S16 are sent. Each is generated and supplied to the steam generation drum water supply control valve V5. Thereby, the steam generation drum water supply control valve V5 switches the level control of the water supply control valve from the normal level to the actual level tracking operation (step S44), and further, the upper limit level of the water supply is changed from the normal opening to the water supply flow rate restriction opening. (Step S45).

  Thereafter, the control computer 10 is passed through the determination of the discharge pressure of the condensate pump 1b by the discharge pressure monitoring circuit 15 (step S54) and the determination of the suction pressure of the boiler feed pump 4a by the suction pressure monitoring circuit 16 (step S55). Even if the boiler feed water pump 4a, which has been temporarily stopped, is started again by the control of the boiler feed water pump restart command circuit 14 (step S56), the feed water status by the boiler feed water pump 4a changes to the steady state. The steam generation drum water supply control valve V5 maintains the above-mentioned actual level and the water supply flow rate restriction opening (No in step S57).

  And if the water supply state by the boiler feed pump 4a transfers to a steady state (Yes of step S57), the drum inflow amount setting value switching circuit 25 and the drum water supply control valve upper limit opening degree switching circuit 27 will send the control signals S7 and S17, respectively. The steam generation drum water supply control valve V5 is generated and supplied to the steam generation drum water supply control valve V5, whereby the steam generation drum water supply control valve V5 returns the level control of the water supply control valve from the actual level to the normal level (step S58). Is returned from the feed water flow rate restriction opening to the normal opening (step S59).

  As described above, according to the present embodiment, the drum inflow set value / upper limit opening switching for controlling the water supply amount from the steam generation drum water supply control valve V5 to the steam generation drum 6 according to the water supply state by the boiler water supply pump 4a. Since the circuit 25 is provided, the overflow operation of the boiler feed pump 4 can be prevented and the safe continuous operation of the condensate feed water cycle system can be realized.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Condensate pump, 4, 4a, 4b ... Boiler feed pump, 6 ... Steam generating drum, 10 ... Control computer, 11 ... Condensate pump backup start command circuit, 12 ... Boiler feed pump temporary forced stop, DESCRIPTION OF SYMBOLS 14 ... Boiler feed pump restart command circuit, 15 ... Discharge pressure monitoring circuit, 16 ... Suction pressure monitoring circuit, 21 ... Time limit monitoring circuit, 23 ... Drum level monitoring circuit, 25 ... Drum inflow amount setting value switching circuit, 27 ... Drum Water supply control valve upper limit opening switching circuit, 100 ... steam turbine, 110 ... condenser, 120 ... boiler, 130, 132, 134 ... condensate water supply control device, PG1, PG4a, PG4b, PG6 ... pressure gauge, V5 ... steam Generated drum water supply control valve, WG ... Water level gauge

Claims (5)

The steam exhausted from the steam turbine is condensed by a condenser, and the water pressurized by the condensate pump and the boiler feed water pump is supplied to the steam generating drum to generate steam, which is supplied to the steam turbine. Used in water supply cycle system,
Condensate pump backup start means for generating a backup start command signal and supplying it to the waiting condensate pump when the condensate pump being operated out of the condensate pumps is abnormally stopped ,
When the backup activation command signal is generated, and temporary forced stop signal is generated and is fed to the boiler feedwater pump in operation, forcing the boiler feedwater pump temporary forced stopping means Ru pause the boiler feed water pump,
A suction pressure monitoring circuit for monitoring the suction pressure of the boiler feed water pump;
Boiler feed pump restarting means for restarting the boiler feed pump that has been forcibly stopped after the suction pressure has been stabilized;
Condensate water supply control apparatus comprising a. In order to measure the elapsed time from the temporary stop of the boiler feed pump, and to notify the operator when a preset allowable time is exceeded before the suction pressure of the boiler feed pump is stabilized A time monitoring means for generating a first alarm signal of
Control means for stopping the operation of the boiler feed pump restarting means by generating the first alarm signal;
The condensate water supply control device according to claim 1 , further comprising: When the water level of the steam generating drum is measured and the measured water level of the steam generating drum falls below a preset allowable water level before the suction pressure of the boiler feed pump is stabilized, this is indicated. Water level monitoring means for generating a second alarm signal for notifying the operator;
Control means for stopping the operation of the boiler feed pump restarting means by generating the second alarm signal;
The condensate water supply control device according to claim 1 , further comprising: The condensate water supply cycle system has a steam generation drum water supply control valve that controls the amount of water supplied from the boiler water supply pump to the steam generation drum,
By temporarily stopping the boiler feed pump, the set value of the feed control to the steam generating drum is tracked to the actual feed amount from the boiler feed pump to the steam drum, and the upper limit of the inflow amount to the steam drum set the value, either the boiler feedwater pump after the boiler feedwater restart resumes, according to claim 1 to 3, further comprising a water supply amount control means to continue a certain time the setting of the upper limit value The condensate water supply control device according to claim 1. A steam turbine that converts thermal energy of steam into rotational energy;
A condenser for condensing steam exhausted from the steam turbine;
A condensate pump for increasing the pressure of water supplied from the condenser to a first pressure;
A boiler feed pump that increases the pressure of the water supplied from the condensate pump to a second pressure that exceeds the first pressure;
A steam generating drum that generates steam again from the water supplied from the boiler feed pump and supplies the steam to the steam turbine;
When the condensate pump in operation is abnormally stopped among the condensate pumps, the boiler feed pump is forcibly temporarily stopped, and the boiler stopped forcibly after the suction pressure of the boiler feed pump is stabilized. A condensate water supply control device for restarting the water supply pump;
Equipped with a,
The condensate water supply control device comprises:
A condensate pump backup starting means for generating a backup start command signal and supplying the standby condensate pump to the standby condensate pump when the operating condensate pump is abnormally stopped;
When the backup activation command signal is generated, a boiler feed pump temporary forced stop means for generating a temporary forced stop signal and supplying the generated boiler feed pump to the operating boiler feed pump;
A suction pressure monitoring circuit for monitoring the suction pressure of the boiler feed water pump;
Boiler feed pump restarting means for restarting the boiler feed pump that has been forcibly stopped after the suction pressure has been stabilized;
Condensate water supply cycle system that includes a.

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