JP4670707B2 - Control apparatus and control method for steam power plant - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a control apparatus and a control method for a steam power generation facility in which the efficiency during a low load operation is improved in a steam power generation facility such as a thermal power plant.

Electric utilities have high power generation efficiency and low carbon dioxide emissions, such as nuclear power generation and gas turbine combined power generation (combined cycle) facilities, from the viewpoint of stable power supply and reduction of carbon dioxide, a global warming gas It is required to operate power generation facilities at a high utilization factor (output close to the rated output). Therefore, the steam power generation facility plays a role of supply power (power generation output adjustment) according to demand.
In recent years, steam power generation facilities are expected to operate with the highest possible power generation efficiency as an energy saving measure.
Conventionally, as such a steam power generation facility, there has been one in which a transformer operation is performed as one of the measures for improving the plant thermal efficiency (see, for example, Patent Document 1).

JP 2005-291113 A

  In a steam power generation facility, two types of water supply means for general boilers, an electric drive water pump (electric water pump) and a steam turbine drive water pump (BFP-T), are used alone or in combination. ing. The advantage of using BFP-T is effective in reducing in-house power (energy saving in a power plant) because motor power is unnecessary. On the other hand, although the electric water supply pump is mainly used at the time of starting the plant or in a low load zone, since it is electric, it has been an obstacle to improving the efficiency particularly during low load operation.

That is, there are the following problems in performing a low load operation using an electric water supply pump.
(1) Reduction in supply reliability: When starting / stopping the unit, use an electric water supply pump. And after that, the turbine-driven feed water pump is used for operation, but when operating below a certain low load operating value (for example, 150,000 kW in a plant with a rated load operating value of 600,000 kW), Switching operation to the electric water supply pump is performed. Therefore, when performing the transformation operation between the rated load operation and the low load operation, the electric water supply pump is operated / stopped several times with such an operation value as a boundary. As a result, the risk of motor failure increases and there is a greater possibility that the electric water supply pump cannot be used when the unit is originally started / stopped.

  (2) Impedance of power supply operation: For example, when a power supply command of 150,000 kW or less which is the above operation value is received, or after a power supply command exceeding 150,000 kW after operation of 150,000 kW or less, It is necessary to switch from the turbine-driven feed pump to the electric feed pump or vice versa. As a result, it is necessary to fix the output for 60 minutes by such load reduction / increase, and this restricts the power supply command.

  (3) Reduction in plant efficiency: The power consumption due to the operation of the electric water supply pump causes a reduction in the in-house ratio and the power transmission end efficiency.

  In order to solve such a problem, it is conceivable to use a turbine-driven feed water pump even in a low load operation. However, a recirculation valve for recirculating water from the discharge side to the suction side is connected to the turbine drive water pump in order to protect the turbine drive water pump when the flow rate is below a predetermined flow rate. During the low load operation, the recirculation valve is opened because the suction flow rate is equal to or lower than the predetermined flow rate. However, as a result, the flow rate of the turbine-driven feed water pump increases, and an output higher than the shaft power is required, so that the turbine-driven feed water pump becomes overloaded. It was difficult to use during load operation.

  Furthermore, since the turbine-driven feed water pump is driven by steam extracted from the main steam, a loop from the turbine-driven feed water pump to the boiler and turbine is formed. When the rotational speed of the pump is controlled or the opening of the boiler throttle valve or governor is controlled, there is a predetermined delay time until these control operations are reflected in the actual set values. Therefore, when a turbine-driven feedwater pump is used during low-load operation, mutual interference occurs in the opening control of the boiler throttle valve and governor and the rotational speed control of the turbine-driven feedwater pump. It was difficult to perform stable control during load operation.

  The present invention has been made to solve the above-described problems, and can improve efficiency as a steam power generation facility, improve reliability, and can quickly respond to a power supply command. An object is to obtain a control device and a control method for a power generation facility.

  A control apparatus for a steam power generation facility according to the present invention includes a turbine-driven feed water pump that performs main feed water, a recirculation valve for recirculating water from a discharge side of the turbine-driven feed water pump to a suction side, and a turbine-driven feed water pump Steam provided on the discharge side and provided with a water supply valve for controlling the flow rate of the main water supply, a boiler throttle valve for controlling the pressure of the water cooling wall of the boiler, and a governor for controlling the pressure of the main steam A control device for a steam power generation facility that controls a power generation facility, wherein the opening degree of the recirculation valve is controlled in accordance with the suction flow rate and the discharge pressure of the turbine-driven feed water pump, and the opening degree control is controlled with hysteresis. A recirculation valve control means, a feed water control means for controlling the flow rate of the main feed water by controlling the rotation speed of the turbine-driven feed water pump with a constant opening of the feed water valve, and a load operation below a predetermined load The main throttle pressure control means for controlling the opening of the boiler throttle valve by providing a dead band of deviation with respect to the target control value and performing control by changing the sensitivity of the governor according to the load value. It is a thing.

  A control apparatus for a steam power generation facility according to the present invention includes a turbine-driven feed water pump that performs main feed water, a recirculation valve for recirculating water from a discharge side of the turbine-driven feed water pump to a suction side, and a turbine-driven feed water pump Steam provided on the discharge side and provided with a water supply valve for controlling the flow rate of the main water supply, a boiler throttle valve for controlling the pressure of the water cooling wall of the boiler, and a governor for controlling the pressure of the main steam A control device for a steam power generation facility that controls a power generation facility, wherein the opening degree of the recirculation valve is controlled in accordance with the suction flow rate and the discharge pressure of the turbine-driven feed water pump, and the opening degree control is controlled with hysteresis. Recirculation valve control means for controlling the flow rate through the water supply valve by controlling the opening of the water supply valve, and controlling the differential pressure between the inlet side and the outlet side of the water supply valve by the number of revolutions of the turbine-driven water supply pump , Water supply control means that controls the flow rate of the feedwater and corrects the sensitivity of the feedwater valve in response to the discharge flow rate of the turbine-driven feedwater pump. And a main steam pressure control means for performing control by changing the sensitivity of the governor according to the load value.

  Further, the control apparatus for a steam power generation facility according to the present invention includes a feed water pump protection means for protecting the turbine-driven feed water pump based on a protection set value corresponding to the opening degree control of the recirculation valve by the recirculation valve control means. It is provided.

In addition, the control method of the steam power generation facility of the present invention includes a turbine-driven feed pump that performs main feed water, a recirculation valve that recirculates water from the discharge side of the turbine-driven feed pump to the suction side, and a turbine-driven feed pump Is provided on the discharge side of the boiler and controls a water supply valve for controlling the flow rate of the main water supply, a boiler throttle valve for controlling the pressure of the water cooling wall of the boiler, and a governor for controlling the pressure of the main steam. A control method for a steam power generation facility, wherein the opening degree of the recirculation valve is controlled in accordance with the suction flow rate and the discharge pressure of the turbine-driven feed water pump, and the opening degree control is controlled with hysteresis, and the opening degree of the feed water valve The flow rate of the main feed water is controlled by controlling the number of revolutions of the turbine-driven feed water pump, and the opening of the boiler throttle valve with respect to the target control value during load operation below a predetermined load. Controls provided dead zone difference, in which to perform the control is changed according to the sensitivity of the governor to the value of the load.

  In addition, the control method of the steam power generation facility of the present invention includes a turbine-driven feed pump that performs main feed water, a recirculation valve that recirculates water from the discharge side of the turbine-driven feed pump to the suction side, and a turbine-driven feed pump Is provided on the discharge side of the boiler and controls a water supply valve for controlling the flow rate of the main water supply, a boiler throttle valve for controlling the pressure of the water cooling wall of the boiler, and a governor for controlling the pressure of the main steam. A control method for a steam power generation facility, wherein the opening degree of the recirculation valve is controlled in accordance with the suction flow rate and the discharge pressure of the turbine-driven feed water pump, and the opening degree control is controlled with hysteresis, and the opening degree of the feed water valve By controlling the flow rate through the water supply valve and controlling the differential pressure between the inlet side and the outlet side of the water supply valve by the number of rotations of the turbine-driven water supply pump, the flow rate control of the main water supply and the turbine drive are performed. The sensitivity of the water supply valve is corrected according to the discharge flow rate of the water supply pump, and during load operation below a predetermined load, the opening of the boiler throttle valve is controlled by providing a dead band of deviation from the target control value. The control is performed by changing the sensitivity of the governor in accordance with the load value.

According to the control apparatus for a steam power generation facility of the present invention, it is possible to achieve an improvement in efficiency as a steam power generation facility, improve reliability, and promptly respond to a power supply command.
Further, according to the control device for a steam power generation facility of the present invention, since it is provided with a water supply control means, it is possible to realize more stable control at the time of low load operation, and to further improve the efficiency as a steam power generation facility. .
Moreover, according to the control apparatus of the steam power generation facility of this invention, the protection operation | movement of the turbine drive water supply pump corresponding to control of the recirculation valve by a recirculation valve control means can be performed.

Moreover, according to the control method of the steam power generation equipment of this invention, the efficiency improvement as the steam power generation equipment can be achieved, the reliability can be improved, and the control capable of promptly responding to the power supply command is realized. be able to.
Moreover, according to the control method of the steam power generation equipment of this invention, since it controlled the feed valve and the turbine drive feed water pump, stable control at the time of low load operation can be realized, and more as a steam power generation equipment. Efficiency improvements can be achieved.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a steam power generation facility to which a control device according to Embodiment 1 of the present invention is applied.
In the figure, a deaerator 1, a turbine-driven feed water pump (TD-BFP) 2, an electric feed water pump (M-BFP) 3, a recirculation valve (PRC) 4, an electric feed water pump flow control valve (FWB) 5, a first Water supply valve (FWV) 6, second water supply valve (FWVB) 7, high pressure heater 8, economizer (ECO) 9, boiler circulation pump (BCP) 10, water cooling wall (WW) 11, first boiler throttle valve ( BT) 12, second boiler throttle valve (BTB) 13, super heater (SH1, SH2) 14a, 14b, governor (GOV) 15, turbine (HP) 16, low range feed water flow meter 17, high range feed water flow meter 18. A control device 100 is provided.

  The deaerator 1 is a device that performs a deaeration process on a liquid containing gas from a condenser (not shown). The turbine-driven feed water pump 2 is a feed water pump that is driven by a turbine (not shown), and is a pump for performing main feed water. In addition, the electric water supply pump 3 is a water supply pump that is driven by electric power and used at the time of starting the plant. The recirculation valve 4 is a valve for recirculating water from the discharge side of the turbine-driven water supply pump 2 or the electric water supply pump 3 to the suction side, and is controlled by a recirculation valve control means 101 described later of the control device 100. It is configured as follows. The electric water supply pump flow control valve 5 is a valve for controlling the flow rate of the electric water supply pump 3.

  The first water supply valve 6 is an on-off valve provided in the main water supply path between the turbine-driven water supply pump 2 and the electric water supply pump 3 and the high-pressure heater 8. The second water supply valve 7 is a bypass valve for controlling the amount of water flowing through the first water supply valve 6, and is configured to be controlled by a water supply control means 102 described later of the control device 100. The first water supply valve 6 and the second water supply valve 7 correspond to a water supply valve for controlling the flow rate of the main water supply, and hereinafter, the first water supply valve 6 is simply referred to as the water supply valve 6. The second water supply valve 7 is referred to as a water supply bypass valve 7. The high-pressure heater 8 is a heater that heats the main feed water.

  The economizer 9 to super heaters 14a and 14b constitute a boiler of a steam power generation facility, and the economizer 9 is a heater that heats water from the high-pressure heater 8 with exhaust gas. The boiler circulation pump 10 is a pump that supplies water to the water cooling wall 11, and the water cooling wall 11 is a heat exchanger that heats the water sent by the boiler circulation pump 10 by a burner (not shown).

  The 1st boiler throttle valve 12 and the 2nd boiler throttle valve 13 are the structures corresponded to the boiler throttle valve for performing the pressure control of the water cooling wall 11, and these boiler throttle valves are the mains which the control apparatus 100 mentions later. It is configured to be controlled by the steam pressure control means 103. The second boiler throttle valve 13 is a bypass valve of the first boiler throttle valve 12. Hereinafter, the first boiler throttle valve 12 is simply referred to as a boiler throttle valve 12, and the second boiler throttle valve 13 is This is referred to as a boiler throttle valve bypass valve 13. The super heaters 14a and 14b are a primary superheater and a secondary superheater. The governor 15 is a control valve for controlling the steam supplied to the turbine 16, and the governor 15 is also configured to be controlled by main steam pressure control means 103 described later of the control device 100. The turbine 16 is a high-pressure turbine driven by main steam.

  The low-range feed water flow meter 17 is a flow meter that measures a low-range flow rate when the feed valve 6 is fully closed and water is supplied through the feed water bypass valve 7, and its output is input to the control device 100. It is configured to be. The high-range feed water flow meter 18 is a flow meter that is provided on the downstream side of the high-pressure heater 8 and measures the flow rate of the main feed water, and its output is input to the control device 100.

  The control device 100 controls each control valve as a steam power generation facility and the turbine-driven feed water pump 2, and includes a recirculation valve control means 101, a feed water control means 102, a main steam pressure control means 103, a feed water pump protection means. 104 is provided. The recirculation valve control means 101 is a means for controlling the opening degree of the recirculation valve 4 in correspondence with the suction flow rate and the discharge pressure of the turbine-driven feed water pump 2 and controlling the opening degree with hysteresis. . The feed water control means 102 controls the flow rate through the feed water bypass valve 7 by controlling the opening degree of the feed water bypass valve 7, and the differential pressure between the inlet side and the outlet side of the feed water bypass valve 7 is set to the rotational speed of the turbine driven feed pump 2. This is a means for controlling the flow rate of the main feed water and correcting the sensitivity of the feed water bypass valve 7 in accordance with the discharge flow rate of the turbine-driven feed water pump 2.

  The main steam pressure control means 103 provides a dead zone for controlling the opening degree of the boiler throttle valve bypass valve 13 during load operation below a predetermined load, and controls the sensitivity of the governor 15 according to the load value. It is a means for performing changed control. The feed water pump protection means 104 is means for protecting the turbine-driven feed water pump 2 based on the protection set value 104a. The protection set value 104a is used for opening control of the recirculation valve 4 by the recirculation valve control means 101. The corresponding setting value.

Next, the operation of the first embodiment will be described.
The recirculation valve control means 101 controls the opening degree of the recirculation valve 4 based on the relationship between the suction flow rate and the discharge pressure in the turbine-driven feed water pump 2.
FIG. 2 is an explanatory diagram showing an example of the opening degree control of the recirculation valve 4, and shows the relationship between the suction flow rate and the discharge pressure (gauge pressure).
In the figure, solid lines 200a and 200b indicate fully open and fully closed straight lines in the present embodiment, and broken lines 300a and 300b indicate conventional fully open and fully closed values. As shown in the figure, in the prior art, the fully open or fully closed control based only on the suction flow rate (in this example, full open at the suction flow rate 290 (t / h), full close at 370 (t / h)), In the present embodiment, the opening degree is controlled according to the values of the discharge pressure and the suction flow rate. For example, conventionally, when the suction flow rate becomes a value of 290 (t / h), the recirculation valve 4 is fully open, whereas in this embodiment, the suction flow rate is 290 (t / h) or less. When the recirculation valve 4 starts to open and the discharge pressure is constant as indicated by the arrow in the figure, the opening degree is controlled according to the decrease in the suction flow rate until the suction flow rate becomes a value of 200 (t / h) or more. Is done. Further, since the recirculation valve control means 101 controls the opening degree of the recirculation valve 4 with control with hysteresis, the recirculation valve is held in a fully opened state until the suction flow rate becomes 260 (t / h). The opening degree is controlled according to the increase of the suction flow rate up to 340 (t / h) at a flow rate higher than that. The control with hysteresis will be described later.

  Thus, conventionally, since the recirculation valve 4 is fully opened / closed only by the suction flow rate, the turbine in the low load zone is used from the viewpoint of preventing overload of the turbine-driven feed water pump 2 when the recirculation valve 4 is fully opened. While it is difficult to supply water with the drive water pump 2, in the present embodiment, the flow rate flowing through the recirculation valve 4 is finely controlled according to the values of the suction flow rate and the discharge pressure. Water supply control can be made possible.

Next, opening control with hysteresis for the recirculation valve 4 of the recirculation valve control means 101 will be described.
FIG. 3 is an explanatory diagram showing the relationship between the suction flow rate and the opening degree of the recirculation valve 4.
As shown in the figure, when the suction flow rate is 290 (t / h) or less, the recirculation valve 4 is opened and fully opened at 200 (t / h) or more. In addition, even if the suction flow rate increases from the fully open state, it is not immediately controlled to the closed side, but remains in the fully open state until 260 (t / h), and is controlled to a closed side with a value higher than that, 340 (t / h) Control until fully closed. Thereafter, the fully closed state is maintained, and when the suction flow rate is 290 (t / h) or less, the above opening / closing control is repeated. By performing such control, it is possible to perform stable water supply control of the turbine-driven water supply pump 2 without causing disturbance to the water supply control of the turbine-driven water supply pump 2.

  By controlling the recirculation valve control means 101 as described above, even if the suction flow rate is reduced, the turbine-driven feed water pump 2 can be operated without increasing the recirculation flow rate. While being able to prevent a load, stable water supply control can be performed by control with hysteresis.

Next, the operation of the water supply control means 102 will be described.
The water supply control means 102 controls the flow rate of the water supply path from the turbine-driven water supply pump 2 to the high-pressure heater 8 by the control of the water supply bypass valve 7 as the flow control in the low load zone, and the difference between the water supply bypass valve 7 The pressure control is controlled by the rotational speed of the turbine-driven feed water pump 2. That is, the water supply control means 102 controls the flow rate through the feed water bypass valve 7 to a desired value by controlling the flow rate of the feed water bypass valve 7 based on the flow rate measured by the low range feed water flow meter 17. When the differential pressure between the inlet side and the outlet side of the feed water bypass valve 7 changes due to the change, the rotational speed of the turbine-driven feed water pump 2 is controlled according to the differential pressure.

  Thus, the water supply control means 102 controls the water supply valve 6 in a fully closed state in the low load zone, and performs flow rate control by controlling the opening degree of the water supply bypass valve 7 and the rotational speed of the turbine-driven water supply pump 2. In addition, in a load range of a predetermined value or more, the feed water valve 6 is controlled to be opened and the feed water bypass valve 7 is closed to rotate the turbine-driven feed pump 2 based on the flow rate measurement value from the high range feed water flow meter 18. Number control is performed to control the flow rate.

  Furthermore, the open / close control amount of the feed water bypass valve 7 is changed according to the discharge flow rate from the turbine-driven feed water pump 2. That is, when the discharge flow rate is small, the feed water bypass valve 7 is controlled to move greatly, and when the discharge flow rate is large, the feed water bypass valve 7 is controlled to move small. That is, when the discharge flow rate of the turbine-driven feed water pump 2 is small, the sensitivity of the feed water bypass valve 7 is high, and when the discharge flow rate is large, the sensitivity correction of the feed water bypass valve 7 is performed so that the sensitivity of the feed water bypass valve 7 is low. Equivalent control is performed.

  By controlling the opening / closing of the feed water bypass valve 7 and the rotation speed of the turbine-driven feed water pump 2 in this way, it is possible to perform control in a region where the pump characteristics are good, and as a result, the flow rate is a small value. Can be stably controlled to that value.

Next, the operation of the main steam pressure control means 103 will be described.
During low-load operation, the driving steam of the turbine-driven feed water pump 2 is extracted from the main steam, so that a loop such as the boiler, the governor 15, and the turbine-driven feed water pump 2 is formed. Further, during low-load operation, a control delay increases between the opening / closing operation of the boiler throttle valve bypass valve 13 and the governor 15 and the actual steam pressure. For these reasons, in the low-load operation, when the same control as that during the rated operation is performed, mutual interference is likely to occur due to the control of the turbine-driven feed water pump 2, the boiler throttle valve bypass valve 13, and the governor 15.

  Therefore, in the present embodiment, the main steam pressure control means 103 provides a dead zone of deviation with respect to the target control value for the boiler throttle valve bypass valve 13 in the low load zone, and the boiler throttle valve in this dead zone range. Control is performed so as not to open and close the bypass valve 13. In the low load operation, the boiler throttle valve 12 is controlled to be fully closed, and only the opening degree of the boiler throttle valve bypass valve 13 is controlled. Moreover, the main steam pressure control means 103 changes the sensitivity of the governor 15 according to the load. That is, the sensitivity is set to be lower as the load is lower. This is because during the low-load operation, the time constant of the control of the entire plant becomes large, so that slow control is performed corresponding to this time constant.

By performing such control, mutual interference among the turbine-driven feed water pump 2, the boiler throttle valve bypass valve 13 and the governor 15 during low load operation can be avoided, and the flow rate can be stabilized even during low load operation. Control can be performed.
Note that the dead zone described above is not a fixed dead zone, but may be set such that the range of the dead zone increases as the load decreases.

Next, the operation of the feed pump protection means 104 will be described.
The feed water pump protection means 104 protects the turbine drive feed water pump 2 in order to protect the turbine drive feed water pump 2 when the discharge flow rate of the turbine drive feed water pump 2 does not reach a prescribed value even when the recirculation valve 4 reaches a predetermined opening degree. Control is performed to stop the pump 2. Here, the protection set value 104a is a set value determined by the relationship between the opening degree of the recirculation valve 4 and the suction flow rate of the turbine-driven feed water pump 2. That is, in this embodiment, since the suction flow rate of the turbine-driven feed water pump is controlled to a value smaller than the conventional value, the opening degree of the recirculation valve 4 is prevented so that the feed water pump protection means 104 does not malfunction at such a low flow rate. The protection set value 104a is set based on the value of the minimum flow rate of the turbine-driven feed water pump 2 corresponding to the above. In the present embodiment, by using such a protection set value 104a, the feed water pump protection means 104 performs the protection operation of the turbine driven feed water pump 2 corresponding to the control of the recirculation valve 4 by the recirculation valve control means 101. It can be carried out.

  In the above embodiment, the structure of the water supply valve has the water supply valve 6 and the water supply bypass valve 7, and the structure for controlling only the water supply bypass valve 7 in the low load zone has been described. In addition, for example, the present invention can be applied to a steam power generation facility in which the water supply valve 6 is set in a normally open state and the flow rate is controlled by controlling the rotational speed of the turbine-driven water supply pump 2. That is, in this case, the water supply control means 102 controls the water supply valve 6 to have a constant opening and the water supply bypass valve 7 to be in a closed state, similarly to the flow rate control in the load band above the predetermined value. The flow rate is controlled by controlling the rotation speed of the turbine-driven feed water pump 2.

It is a block diagram which shows the control apparatus of the steam power generation equipment by Embodiment 1 of this invention. It is explanatory drawing which shows the opening degree control of the recirculation valve in Embodiment 1 of this invention. It is explanatory drawing which shows the relationship between the suction flow volume and the opening degree of a recirculation valve in Embodiment 1 of this invention.

Explanation of symbols

2 Turbine-driven feed water pump 4 Recirculation valve 6 First feed valve 7 Second feed valve 12 First boiler throttle valve 13 Second boiler throttle valve 15 Governor 100 Control device 101 Recirculation valve control means 102 Feed water control means 103 Main steam pressure control means 104 Water supply pump protection means 104a Protection set value

Claims (5)

A turbine-driven feed water pump for performing main feed water, a recirculation valve for recirculating water from the discharge side of the turbine-driven feed water pump to the suction side, and a flow rate of the main feed water provided on the discharge side of the turbine-driven feed water pump Of a steam power generation facility for controlling a steam power generation facility having a water supply valve for controlling the pressure, a boiler throttle valve for controlling the pressure of the water cooling wall of the boiler, and a governor for controlling the pressure of the main steam. A control device,
Recirculation valve control means for controlling the opening degree of the recirculation valve in correspondence with the suction flow rate and discharge pressure of the turbine-driven feed water pump, and making the opening degree control control with hysteresis;
Water supply control means for controlling the flow rate of the main water supply by controlling the rotation speed of the turbine-driven water supply pump with the opening of the water supply valve being constant,
During load operation below a predetermined load, the opening of the boiler throttle valve is controlled by providing a dead band of deviation with respect to the target control value, and the sensitivity of the governor is changed according to the load value. A control device for a steam power generation facility comprising main steam pressure control means for performing A turbine-driven feed water pump for performing main feed water, a recirculation valve for recirculating water from the discharge side of the turbine-driven feed water pump to the suction side, and a flow rate of the main feed water provided on the discharge side of the turbine-driven feed water pump Of a steam power generation facility for controlling a steam power generation facility having a water supply valve for controlling the pressure, a boiler throttle valve for controlling the pressure of the water cooling wall of the boiler, and a governor for controlling the pressure of the main steam. A control device,
Recirculation valve control means for controlling the opening degree of the recirculation valve in correspondence with the suction flow rate and discharge pressure of the turbine-driven feed water pump, and making the opening degree control control with hysteresis;
By controlling the flow rate of the water supply valve by controlling the opening of the water supply valve, and controlling the differential pressure between the inlet side and the outlet side of the water supply valve by the number of rotations of the turbine-driven water supply pump, Water supply control means for performing flow rate control and correcting sensitivity of the water supply valve corresponding to the discharge flow rate of the turbine-driven water supply pump;
During load operation below a predetermined load, the opening of the boiler throttle valve is controlled by providing a dead band of deviation with respect to the target control value, and the sensitivity of the governor is changed according to the load value. A control device for a steam power generation facility comprising main steam pressure control means for performing   2. The steam power generation according to claim 1, further comprising a feed water pump protection means for protecting the turbine-driven feed water pump based on a protection set value corresponding to the opening degree control of the recirculation valve by the recirculation valve control means. Equipment control device. A turbine-driven feed water pump for performing main feed water, a recirculation valve for recirculating water from the discharge side of the turbine-driven feed water pump to the suction side, and a flow rate of the main feed water provided on the discharge side of the turbine-driven feed water pump A control method for a steam power generation facility for controlling a water supply valve for controlling the pressure, a boiler throttle valve for controlling the pressure of the water cooling wall of the boiler, and a governor for controlling the pressure of the main steam,
While controlling the opening degree of the recirculation valve corresponding to the suction flow rate and the discharge pressure of the turbine-driven feed water pump, the opening degree control is a control with hysteresis,
The flow rate control of the main feed water is performed by controlling the rotation speed of the turbine-driven feed water pump with the opening of the feed water valve being constant.
During load operation below a predetermined load, the opening of the boiler throttle valve is controlled by providing a dead band of deviation with respect to the target control value, and the sensitivity of the governor is changed according to the load value. The control method of the steam power generation equipment characterized by performing. A turbine-driven feed water pump for performing main feed water, a recirculation valve for recirculating water from the discharge side of the turbine-driven feed water pump to the suction side, and a flow rate of the main feed water provided on the discharge side of the turbine-driven feed water pump A control method for a steam power generation facility for controlling a water supply valve for controlling the pressure, a boiler throttle valve for controlling the pressure of the water cooling wall of the boiler, and a governor for controlling the pressure of the main steam,
While controlling the opening degree of the recirculation valve corresponding to the suction flow rate and the discharge pressure of the turbine-driven feed water pump, the opening degree control is a control with hysteresis,
By controlling the flow rate of the water supply valve by controlling the opening of the water supply valve, and controlling the differential pressure between the inlet side and the outlet side of the water supply valve by the number of rotations of the turbine-driven water supply pump, While performing flow rate control, performing sensitivity correction of the water supply valve corresponding to the discharge flow rate of the turbine-driven water supply pump,
During load operation below a predetermined load, the opening of the boiler throttle valve is controlled by providing a dead band of deviation with respect to the target control value, and the sensitivity of the governor is changed according to the load value. The control method of the steam power generation equipment characterized by performing.

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