JP4949712B2 - Power plant water supply equipment - Google Patents

Description

  The present invention relates to a water supply device for a power plant applied to a steam power plant or the like.

  For example, in a steam power plant, when the plant load is restarted or when the plant load changes significantly, a depressurization flash phenomenon occurs in the piping that supplies the deaerator water tank water to the boiler. There is.

  That is, in a steam power plant, the deaerator has a deaerator water storage tank for storing deaerated water, and a supply water supply pipe is connected from the condenser to the deaerator. A water level control valve is provided in the piping, and extraction (steam) can be supplied to the deaerator. In this case, the feed water supplied from the condenser to the deaerator is at a temperature substantially equal to the saturation temperature of the pressure in the deaerator during the plant load operation, and is stored in the deaerator water storage tank. The amount of water supplied is kept constant by a water level control valve. Further, a feed pipe for feeding the stored feed water to the boiler is provided at the lower part of the deaerator water storage tank, and a feed water booster pump and a feed water pump are provided in the feed pipe. . In this case, the deaerator and the deaerator water storage tank are arranged at a position higher than the feed water booster pump in order to secure the suction pressure of the feed water booster pump.

  Further, the supply pipe from the deaerator is provided with a circulation pipe and a blow recovery pipe branched from the supply pipe, and the circulation pipe has a circulation pump and is connected to the supply pipe, The blow recovery pipe has a blow recovery valve and is connected to the condenser.

  Accordingly, during the load operation of the plant, the feed water is supplied from the condenser to the deaerator through the supply pipe, and this feed water is deaerated by extraction, and the feed water is stored in the deaerator water storage tank. And the feed water stored in the deaerator water storage tank by the feed water booster pump and the feed water pump is fed to the boiler through the feed pipe. On the other hand, when shutting down the plant load, etc., the supply of the water stored in the deaerator water storage tank to the boiler is stopped, and the supply of water from the condenser to the deaerator and the supply of bleed air are also stopped. The

  When the plant is restarted, the feed water stored in the deaerator water storage tank is again fed to the boiler by the feed water booster pump and the feed water pump, while the feed water is supplied from the condenser to the deaerator. Then, it is deaerated by the auxiliary steam, and the feed water is stored in the deaerator water storage tank. In this case, the feed pipe for feeding the water stored in the deaerator water storage tank to the boiler is provided with two systems, a feed pipe for startup and a feed pipe for normal operation after startup. When the plant is restarted, water is supplied to the boiler using the supply pipe for startup.

  However, when the plant is restarted, low-temperature feed water is supplied from this condenser to the deaerator and deaerated and then stored in the deaerator water storage tank. The pressure and temperature of the water supply in the tank will decrease. Then, a pressure difference and a temperature difference occur between the low-temperature water supply in the deaerator water storage tank and the high-temperature water supply in the start-up supply pipe, causing a flash phenomenon. If the feed water pump sucks, each pump may be damaged. At this time, a pressure difference and a temperature difference also occur between the low-temperature water supply in the deaerator water storage tank and the high-temperature water supply remaining in the post-startup supply pipe, and the post-startup supply pipe is flushed. A phenomenon may occur, and a hammering phenomenon may occur and each pump may be damaged.

  As a solution to such a problem, for example, there are those described in Patent Documents 1 and 2 below. The flush prevention device of Patent Document 1 is connected to a condenser branching from a deaerator downcomer in a water supply facility for supplying water from a deaerator water storage tank to a main feed pump via a deaerator downcomer. If a sudden drop in load occurs when the plant load is cut off, the deaerator blow recovery pipe has a control valve that quickly replaces the water supply in the deaerator water storage tank. This is to prevent the flash phenomenon that occurs in the deaerator, deaerator downcomer pipe, and feed water pump connecting pipe. Further, the power plant and the starting method of Patent Document 2 are provided with a pressure detector for detecting the pressure in the deaerator, and based on a master control trip signal indicating a stop of the power plant and a pressure signal from the pressure detector. Thus, the deaerator pressure reduction valve is controlled so that the pressure in the deaerator decreases at a predetermined rate of change.

Japanese Patent Laid-Open No. 08-170805 JP-A-11-248106

  In the conventional power plant water supply device described above, when the plant is stopped, the hot water supply in the deaerator water storage tank is collected in the condenser, while the low temperature condensate in the condenser is recovered in the deaerator water storage tank. By supplying water to the tank and replacing the water supply in the deaerator water storage tank to lower the temperature, the flash phenomenon that occurs in deaerators and deaerator downcomers is prevented.

  However, this flash phenomenon is caused by the water supply in the deaerator water storage tank whose pressure and temperature have decreased and the high-temperature water supply remaining in the post-startup supply pipe (deaerator precipitator) that has not been used yet. It is generated when pressure difference and temperature difference occur. Therefore, as in Patent Documents 1 and 2 described above, even if the hot water supply in the deaerator water storage tank is replaced with the low temperature water supply when the plant is stopped, the post-startup feed pipe (deaerator downcomer pipe) ) The temperature of the hot water remaining in the interior cannot be lowered, and the occurrence of the flash phenomenon in the post-startup supply pipe (deaerator downcomer) cannot be reliably prevented. Further, since the deaerator pressure is governed by the turbine bleed pressure during normal load operation, it is disclosed in Patent Document 1 when the plant load greatly drops during operation, particularly when the load is 20% or more. It is difficult to control by using the deaerator pressure as a signal.

  The present invention solves the above-described problems, and provides a water supply device for a power plant that is improved in safety by preventing a flash phenomenon that occurs when the plant starts up and when the load drops during normal load operation. The purpose is to provide.

In order to achieve the above object, a water supply apparatus for a power plant according to claim 1 of the present invention includes a deaerator for degassing feed water to remove impurities, and a supply for supplying feed water from a condenser to the deaerator. A pipe, a deaerator water storage tank for storing the water deaerated by the deaerator, a supply pipe connected to a lower part of the deaerator water tank for supplying the plant water to the boiler, A blow recovery pipe that branches off from a middle part of the supply pipe and collects the water in the supply pipe to the condenser, a blow recovery valve provided in the blow recovery pipe, and the deaerator water storage tank Measuring means comprising a tank temperature sensor for measuring the temperature of the feed water in the pipe and a pipe temperature sensor for measuring the temperature of the feed water in the feed pipe, and the tank temperature sensor when the load drops after the load is cut off and during normal load operation Measured by the tank and the pipe temperature sensor There is characterized in that and control means for controlling opening and closing the blow recovery valve to be less than the set temperature deviation deviation between the measured pipe feed water temperature is set in advance.

A water supply device for a power plant according to a second aspect of the present invention includes: a deaerator that removes impurities by degassing the supply water; a supply pipe that supplies water to the deaerator from a condenser; and the deaerator A deaerator water tank for storing deaerated water, a feed pipe connected to the lower part of the deaerator water tank for feeding plant water to the boiler, and a branch from the middle of the feed pipe Then, a blow recovery pipe for recovering the water supply in the feed pipe to the condenser, a blow recovery valve provided in the blow recovery pipe, a pressure sensor for measuring the pressure in the deaerator, and the desorption Measuring means comprising a tank temperature sensor for measuring the temperature of the feed water in the gas storage tank and a pipe temperature sensor for measuring the temperature of the feed water in the supply pipe, and a deaerator measured by the pressure sensor after the load is interrupted So that the pressure drops at a preset rate of pressure change While the blow recovery valve is controlled to open and close, when the load drops during normal load operation, the deviation between the tank water temperature measured by the tank temperature sensor and the pipe water temperature measured by the pipe temperature sensor is preset. Control means for controlling the opening and closing of the blow recovery valve so as to be smaller than the set temperature deviation is provided.

According to a third aspect of the present invention, there is provided a water supply device for a power plant, a deaerator for removing impurities by degassing the feed water, a supply pipe for supplying water from a condenser to the deaerator, and the deaeration A deaerator water storage tank for storing the feed water deaerated by the cooler, a supply pipe connected to the lower part of the deaerator water storage tank for supplying the plant water to the boiler, and a middle part of the supply pipe A feed water circulation pipe that branches from the feed water and returns the feed water in the feed pipe to the deaerator , a feed water circulation pump provided in the feed water circulation pipe, and the temperature of the feed water in the deaerator water storage tank is measured Measuring means comprising a tank temperature sensor and a pipe temperature sensor for measuring the temperature of the feed water in the supply pipe, and a tank water supply temperature measured by the tank temperature sensor when the load drops after the load is interrupted and during normal load operation, The pipe feed water temperature measured by the pipe temperature sensor It is characterized in that the deviation is and control means for driving and controlling the water supply circulation pump to be smaller than the set temperature difference which is set in advance.

A water supply device for a power plant according to a fourth aspect of the present invention comprises: a deaerator that removes impurities by degassing the supply water; a supply pipe that supplies water from a condenser to the deaerator; and the deaerator. A deaerator water tank for storing deaerated water, a feed pipe connected to the lower part of the deaerator water tank for feeding plant water to the boiler, and a branch from the middle of the feed pipe A feed water circulation pipe for returning the feed water in the feed pipe to the deaerator, a feed water circulation pump provided in the feed water circulation pipe, a pressure sensor for measuring the pressure in the deaerator, and the deaeration measuring means consisting of a pipe temperature sensor for measuring the temperature of the feedwater tank temperature sensor and the feed piping which measures the temperature of the feedwater vessel water storage tank, a deaerator that the pressure sensor is measured after load rejection The supply is performed so that the pressure decreases at a predetermined rate of change in pressure. While the circulation pump is driven and controlled, when the load drops during normal load operation, the preset temperature is set to the deviation between the tank water temperature measured by the tank temperature sensor and the pipe water temperature measured by the pipe temperature sensor. Control means for drivingly controlling the feed water circulation pump so as to be smaller than the deviation is provided.

  According to the water supply device for a power plant of the invention of claim 1, the deaerator is connected to the supply pipe for supplying water from the condenser to the deaerator and stores the water deaerated by the deaerator. A supply pipe for supplying water to the boiler is connected to the lower part of the water storage tank, and a blow recovery pipe is provided that branches from the middle of the supply pipe and collects the water in the supply pipe to the condenser. A blow recovery valve is installed, and a measurement unit that measures the pressure of the deaerator or the temperature of the feed water stored in the deaerator water storage tank, and a control that controls the opening and closing of the blow recovery valve based on the measurement result of the water supply measurement unit Means are provided.

  Therefore, when the plant is started up, the water supply from the condenser is supplied to the deaerator through the supply pipe, so that the temperature of the water supply in the deaerator water storage tank decreases and the pressure difference with the water supply in the supply pipe is reduced. The control means controls the blow recovery valve of the blow recovery pipe based on the pressure of the deaerator measured by the measuring means or the temperature of the feed water stored in the deaerator water storage tank. Because the high-temperature feed water staying in the feed pipe is collected in the condenser and the temperature drops, the pressure difference and temperature difference between the feed water in the deaerator storage tank and the feed water in the feed pipe increase. However, it is possible to improve the safety by preventing the occurrence of the flash phenomenon.

Moreover, according to the water supply apparatus of the power plant of the invention of claim 1 , the measuring means measures the temperature of the water supply in the deaerator water storage tank and the temperature of the water supply in each supply pipe. The control means is a deviation between the tank water temperature measured by the tank temperature sensor and the pipe water temperature measured by the pipe temperature sensor when the load drops after the load is shut off and during normal load operation. Since the blow recovery valve is controlled to be smaller than the preset temperature deviation, the deviation between the feed water temperature of the deaerator water storage tank and the feed water temperature of each feed pipe is smaller than the preset temperature deviation. Thus, the occurrence of the flash phenomenon can be surely prevented.

According to the water supply device for a power plant of the invention of claim 2 , the measuring means includes a pressure sensor for measuring the pressure in the deaerator, a tank temperature sensor for measuring the temperature of the water supply in the deaerator water storage tank, It consists of a pipe temperature sensor that measures the temperature of the feed water in each feed pipe, and after the load is cut off, the control means drops the pressure in the deaerator measured by the pressure sensor at a preset pressure change rate while opening and closing control of the blow recovery valve to, when the normal load operation in the load is lowered, the deviation between the pipe feed water temperature of the tank water temperature and piping temperature sensor tank temperature sensor has measured is measured is previously set Since the blow recovery valve is controlled to open and close so that it is smaller than the set temperature deviation, changing the parameter for controlling the opening and closing of the blow recovery valve according to the plant load changes the flow rate according to the plant operating condition. And enabling prevention control Interview phenomenon, it can be prevented reliably occurrence of flashing phenomenon.

According to the water supply device for a power plant of the invention of claim 3 , the deaerator is connected to the supply pipe for supplying water from the condenser, while the deaerator for storing the water deaerated by the deaerator. A feed pipe for feeding water to the boiler is connected to the lower part of the air storage tank, and a feed water circulation pipe that branches from the middle of the feed pipe and returns the feed water in the feed pipe to the deaerator is installed. The feed water circulation pump is mounted, and the measurement means for measuring the pressure of the deaerator or the temperature of the feed water stored in the deaerator water storage tank, and the drive control of the feed water circulation pump based on the measurement result of the feed water measurement means Control means are provided.

  Therefore, when the plant is started up, the water supply from the condenser is supplied to the deaerator through the supply pipe, so that the temperature of the water supply in the deaerator water storage tank decreases and the pressure difference with the water supply in the supply pipe is reduced. However, the control means drives and controls the feed water circulation pump based on the pressure of the deaerator measured by the measuring means or the temperature of the feed water stored in the deaerator water storage tank. Since the high temperature feed water staying in the pipe is recovered by the condenser and the temperature drops, the pressure difference and temperature difference between the feed water in the deaerator storage tank and the feed water in the feed pipe do not increase. The occurrence of a flash phenomenon can be prevented and safety can be improved.

According to the water supply device of the power plant of the invention of claim 3 , the measuring means includes a tank temperature sensor for measuring the temperature of the water supply in the deaerator water storage tank, and a pipe for measuring the temperature of the water supply in each supply pipe As a temperature sensor, the control means has preset a deviation between the tank water temperature measured by the tank temperature sensor and the pipe water temperature measured by the pipe temperature sensor when the load drops after the load is interrupted and during normal load operation. Since the feed water circulation pump is driven and controlled to be smaller than the set temperature deviation, the deviation between the feed water temperature of the deaerator water storage tank and the feed water temperature of each feed pipe is smaller than the set temperature deviation, so that the flash phenomenon can be ensured. Can be prevented.

According to the water supply device for a power plant of the invention of claim 4, the measuring means includes a pressure sensor for measuring the pressure in the deaerator, and a tank temperature sensor for measuring the temperature of the water supply in the deaerator water storage tank; The pipe temperature sensor measures the temperature of the feed water in each feed pipe, and after the load is shut off, the control means supplies the water so that the deaerator pressure measured by the pressure sensor drops at a preset rate of change in pressure. When the load is reduced during normal load operation while driving the circulation pump, the deviation between the tank feed water temperature measured by the tank temperature sensor and the pipe feed water temperature measured by the pipe temperature sensor is set in advance. Since the feedwater circulation pump is driven and controlled to be smaller, the flash current corresponding to the operating state of the plant can be changed by changing the parameter for opening / closing the blow recovery valve according to the plant load. May be of the permit prevention control to prevent reliably the occurrence of flashing phenomenon.

  Exemplary embodiments of a water supply device for a power plant according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a schematic configuration diagram illustrating a water supply device for a power plant according to a first embodiment of the present invention, and FIG. 2 illustrates a pressure change of water supply in a deaerator water storage tank in the water supply device for the power plant according to the first embodiment. A graph and FIG. 3 are graphs showing the temperature change of the water supply in the deaerator water storage tank and the water supply in the second supply pipe in the water supply device of the power plant of the first embodiment.

  In the water supply apparatus of the power plant according to the first embodiment, as shown in FIG. 1, the deaerator 11 removes impurities such as dissolved oxygen from the water supplied from the condenser (condensate). It has a deaerator water storage tank 12 for storing the feed water from which impurities have been deaerated. A supply pipe 13 for supplying water from a condenser (not shown) is connected to the deaerator 11, and a water level adjusting valve 14 and a low-pressure heater 15 are provided in the supply pipe 13. In addition, an extraction pipe 16 to which heated steam (intermediate pressure steam) extracted from an intermediate pressure turbine (not shown) is connected to the deaerator 11 and an auxiliary steam pipe 17 to which auxiliary steam is supplied are connected. The auxiliary steam control valve 18 is attached to the auxiliary steam pipe 17.

  Also, a lower part of the deaerator water storage tank 12 is provided with a first feed pipe 19 and second feed pipes 20 and 21 for feeding the stored feed water to the boiler. The first feed pipe 19 is for supplying water to the boiler at the start of the plant, and the two second supply pipes 20 and 21 are for supplying water to the boiler during normal load operation after the start of the plant. The first feed pipe 19 is provided with a feed booster pump 22 and a feed pump 23, while the second feed pipes 20 and 21 are provided with feed booster pumps 24 and 26 and feed pumps 25 and 27. The downstream ends of the feed pipes 19, 20, and 21 are collectively connected to a boiler (not shown).

  In this case, the deaerator 11 and the deaerator water storage tank 12 are arranged at a higher position than the water supply booster pumps 22, 24, 26 in order to secure the suction pressure of the water supply booster pumps 22, 24, 26. . Recirculation pipes 28, 29, and 30 are provided on the downstream side of the water supply pumps 23, 25, and 27 in the first and second supply pipes 19, 20, and 21, respectively. 29 and 30 have recirculation valves 31, 32 and 33, and a predetermined amount of water can be recirculated to the upper part of the deaerator water storage tank 12.

  The first supply pipe 19 has a descending portion 19a that descends from the deaerator water storage tank 12, a horizontal portion 19b, and an unillustrated ascending portion that reaches the boiler. A water supply tank 12 and a first water supply circulation pipe 34 that circulates water in the descending portion 19 a of the first supply pipe 19 are provided to be branched, and the first water supply circulation pipe 34 is downstream of the low pressure heater 15 in the supply pipe 13. Connected to the side.

  Further, the second supply pipes 20, 21 have a descending portion 20a descending from the deaerator water storage tank 12, a horizontal portion 20b, and an unillustrated ascending portion reaching the boiler, on the downstream side of the descending portion 20a. The second feed water circulation pipes 35 and 36 for circulating the water in the deaerator water storage tank 12 and the descending portion 20a of the second feed pipe 20 are branched, and the second feed water circulation pipes 35 and 36 are supplied. The pipe 13 is connected to the downstream side of the low-pressure heater 15.

  In this case, the first water supply circulation pipe 34 and the second water supply circulation pipes 35 and 36 are connected to the supply pipe 13 at the downstream side, and a water supply circulation pump 37 is provided in the middle.

  On the downstream side of the lowering portion 19 a in the first supply pipe 19, between the water supply booster pump 22 and the water supply pump 23, water in the lowering portion 19 a of the deaerator water storage tank 12 and the first supply pipe 19 is supplied. A first blow recovery pipe 38 for recovery is branched and provided, and the first blow recovery pipe 38 has a blow recovery valve 39. Further, the second feed pipes 20 and 21 are downstream of the descending portions 20a and 21a, and between the feed water booster pumps 24 and 26 and the feed water pumps 25 and 27, the deaerator water storage tank 12 and the second feed pipe. The second blow recovery pipes 40 and 42 for collecting the water of the descending portions 20a and 21a of the supply pipes 20 and 21 are provided in a branched manner, and the second blow recovery pipes 40 and 42 have blow recovery valves 41 and 43, respectively. ing. And the downstream side of each blow | bowl collection | recovery piping 38,40,42 gathers and is connected to the condenser.

  In the present embodiment, a pressure sensor 44 that measures the pressure in the deaerator 11 is provided as a measuring unit that measures the pressure of the deaerator 11, and the measurement result of the pressure sensor 44 is the control device 45. Is output. The control device 45 controls the opening and closing of the blow recovery valves 39, 41, and 43 so that the pressure in the deaerator 11 measured by the pressure sensor 44 drops at a predetermined rate of change in pressure. Yes. In this case, the control device 45 calculates the pressure change rate per unit time based on the pressure in the deaerator 11 measured by the pressure sensor 44, and compares the calculated actual pressure change rate with a predetermined pressure change rate. is doing.

  In the present embodiment, as a water supply measuring means for measuring the temperature of the water supply stored in the deaerator water storage tank 12, a tank temperature sensor 46 for measuring the temperature of the water supply in the deaerator water storage tank 12, A pipe temperature sensor 47 for measuring the temperature of the feed water in the descending part 19a of the first feed pipe 19, and a pipe temperature sensor 48 for measuring the temperature of the feed water in the descending parts 20a, 21a of the second feed pipes 20, 21; 49, and the measurement results of the temperature sensors 46, 47, 48, 49 are output to the control device 45. And this control apparatus 45 is the 1st, 2nd feed piping 19 and 20 which the feed water temperature in the deaerator water storage tank 12 measured by the tank temperature sensor 46, and each piping pressure sensor 47,48,49 measured. , 21 is controlled to open and close the blow recovery valves 39, 41, 43 so that the deviation from the feed water temperature in the descending portions 19a, 20a, 21a is smaller than a preset temperature deviation.

  Therefore, during normal load operation of the plant, water is supplied from the condenser to the deaerator 11 through the supply pipe 13, and this water supply is free from impurities such as dissolved oxygen by the heated steam supplied from the extraction pipe 16. Deaerated and the feed water is stored in the deaerator water storage tank 12. On the other hand, the water supply booster pumps 24 and 26 and the water supply pumps 25 and 27 are driven to supply water stored in the deaerator water storage tank 12 to the boiler through the second supply pipes 20 and 21.

  By the way, during the normal load operation of the plant, the pressure of the deaerator 11 may decrease due to some cause or by intentionally reducing the operation load. At this time, in the first feed pipe 19 (and one of the second feed pipes 20 and 21) in which the water supply is stopped, the low-temperature feed water of the deaerator water storage tank 12 and the first feed pipe 19 A pressure difference and a temperature difference are generated between the remaining high-temperature water supply, and water hammer and a flash phenomenon occur in each of the supply pipes 19 and 20.

  Therefore, in this embodiment, the control device 45 includes the feed water temperature in the deaerator water storage tank 12 measured by the tank temperature sensor 44 and the feed pipes 19 and 20 measured by the pipe temperature sensors 47, 48 and 49. , 21 is controlled to open and close the blow recovery valves 39, 41, 43 so that the deviation from the feed water temperature in the descending portions 19a, 20a, 21a is smaller than the set temperature deviation. The occurrence of a water hammer and a flash phenomenon due to a temperature difference from the water supply in each of the supply pipes 19, 20, 21 is prevented.

  Further, when the plant is stopped for some reason during normal load operation of the plant, the supply of water supply from the condenser to the deaerator 12 is stopped by closing the water level control valve 14. Then, the supply of the heating steam is stopped, and the deaeration process of the feed water in the deaerator 11 is stopped. At this time, the pressure in the deaerator 11 and the deaerator water storage tank 12 hardly decreases, and the temperature of the feed water staying in the deaerator water tank 12 and each of the supply pipes 19, 20, 21 hardly decreases. Thus, the state of the load operation immediately before the stop is maintained.

  Thereafter, when the plant can be restored and restarted, the water level control valve 14 is opened, so that water is supplied from the condenser to the deaerator 11 and auxiliary steam is supplied. Deaerated and the feed water is stored in the deaerator water storage tank 12. On the other hand, the feed booster pump 22 and the feed pump 23 are driven to start feeding the boiler through the first feed pipe 19 of the feed water stored in the deaerator water storage tank 12.

  However, when the plant is restarted, low temperature feed water is supplied from the condenser to the deaerator 11 and subjected to deaeration treatment, and then the low temperature feed water is stored in the deaerator water storage tank 12, so that the high temperature state is reached. The pressure and temperature of the feed water in the deaerator water storage tank 12 maintained are lowered. On the other hand, since the feed water booster pumps 22, 24, 26 and the feed water pumps 23, 2, 27 are stopped in the first and second feed pipes 19, 20, 21 until the restart of the plant, the first 1. High temperature feed water stays in the second feed pipes 19, 20, and 21. Therefore, a pressure difference and a temperature difference are generated between the low-temperature water supply in the deaerator water storage tank 12 and the high-temperature water supply remaining in the first and second supply pipes 19, 20, and 21. , 20 and 21 will cause a flash phenomenon.

  Therefore, in this embodiment, after the plant is stopped, the control device 45 causes the blow recovery valves 39, 41, and so that the pressure in the deaerator 11 measured by the pressure sensor 44 becomes a predetermined pressure drop rate. By controlling the opening and closing 43, the occurrence of a flash phenomenon due to the pressure difference between the water supply in the deaerator water storage tank 12 and the water supply in each of the supply pipes 19, 20, and 21 is prevented.

  Further, in this embodiment, the occurrence of the flash phenomenon can be prevented by the temperature deviation of the water supply instead of the pressure drop rate of the water supply. That is, the control device 45 controls the water supply temperature in the deaerator water storage tank 12 measured by the tank temperature sensor 46 and the descending portion of each feed pipe 19, 20, 21 measured by each pipe temperature sensor 47, 48, 49. The blow recovery valves 39, 41, 43 are controlled to be opened and closed so that the deviation from the feed water temperature in 19a, 20a, 21a is smaller than the set temperature deviation, so that the feed water of the deaerator water storage tank 12 and each feed pipe 19 are controlled. , 20, 21 prevents the flash phenomenon from occurring due to a temperature difference from the water supply.

  The pressure of the deaerator 11 at which the flash phenomenon does not occur due to the storage amount of the feed water in the deaerator water storage tank 12, the pipe lengths and pipe diameters of the descending portions 19a, 20a, 21a in the feed pipes 19, 20, 21 A drop rate is set in advance, and the blow recovery valves 39, 41, and 43 are controlled to open and close so that the pressure in the deaerator 11 measured by the pressure sensor 44 becomes the pressure drop rate. That is, as shown in FIG. 2, the pressure drop rate Pe in the deaerator 11 that decreases with the lapse of time t from the plant stop is set, and the actual pressure calculated based on the pressure measured by the pressure sensor 44 is set. The opening of the blow recovery valves 39, 41, 43 is controlled so that the pressure drop rate becomes this pressure drop rate Pe, and the amount of water supplied to the condenser from each blow recovery pipe 38, 40, 42 is adjusted. To do.

  Further, as shown in FIG. 3, the water supply temperature Tt in the deaerator water storage tank 12 decreases with the passage of time t from the plant stop, but the descending portions 19a, 20a, 21a of the respective supply pipes 19, 20, 21 are provided. The feed water temperature Tp in the inside hardly decreases, and the deviation ΔT between the feed water temperature Tt in the deaerator water storage tank 12 and the feed water temperatures Tp in the descending portions 19a, 20a, 21a of the feed pipes 19, 20, 21 is the upper limit. The blow recovery valves 39, 41, 43 are opened at time t11 when the value is larger than the value, and the opening of each of the blow recovery valves 39, 41, 43 is controlled so that the deviation ΔT is smaller than the upper limit value. The amount of water supplied to the condenser from the recovery pipes 38, 40, and 42 is adjusted.

  Therefore, after the plant is stopped, the control device 45 allows the pressure drop rate calculated based on the pressure in the deaerator 11 to be a predetermined pressure drop rate Pe set in advance or Blow recovery valves 39, 41 so that the deviation ΔT between the feed water temperature Tt in the water storage tank 12 and the feed water temperature Tp in the descending portions 19a, 20a, 21a of the feed pipes 19, 20, 21 becomes smaller than the upper limit value. , 43 are controlled. Therefore, the water supply in the deaerator water storage tank 12 and the water supply in the supply pipes 19, 20, 21 flow to the condenser through the blow recovery pipes 38, 40, 42, while the low temperature water supply is in the deaerator water storage tank 12. To be supplied. As a result, the pressure in the deaerator 11 decreases, the water supply temperature in the deaerator water storage tank 12 and the water supply temperature in the supply pipes 19, 20, 21 decrease, and the flash phenomenon due to the pressure difference and temperature difference between the two. Is prevented from occurring.

  Thus, in the water supply apparatus of the power plant of Example 1, water is supplied to the boiler at the time of start-up of the plant to the lower part of the deaerator water storage tank 12 that stores the water deaerated by the deaerator 11. The first supply pipe 19 is connected to the second supply pipes 20 and 21 for supplying water to the boiler after the plant is started, and branched from the middle of the first and second supply pipes 19, 20, and 21. Then, blow recovery pipes 38, 40, and 42 for collecting the feed water in the respective supply pipes 19, 20, and 21 are provided in the condenser, and blow recovery valves 39, 41, and 43 are attached, and the pressure of the deaerator 11 is set. A pressure sensor 44 that measures the temperature, a tank temperature sensor 46 that measures the temperature of the feed water stored in the deaerator water storage tank 12, and a pipe temperature sensor 47 that measures the temperature in each of the supply pipes 19, 20, and 21. 48 and 49, and the control device 45 has a pressure sensor. And opening and closing control of the blow recovery valve 39, 41, 43 based on the measurement result of the support 44 or tank temperature sensor 46 and the pipe temperature sensor 47, 48 and 49,.

  Therefore, when the load drops after the load is interrupted and during normal load operation, the water supply from the condenser is supplied to the deaerator 11 through the supply pipe 13, so that the pressure in the deaerator 11 and the deaeration are reduced. The temperature of the water supply in the storage tank 12 decreases and a pressure difference and a temperature difference from the water supply staying in the first and second supply pipes 19, 20, and 21 occur. The blow recovery valves 39, 41, 43 are controlled based on the pressure change of the air vessel 11 or the water supply temperature change of the deaerator water storage tank 12, and stay in the first and second supply pipes 19, 20, 21. Since the high temperature water supply is recovered by the condenser and the temperature drops, the pressure difference and temperature difference between the water supply in the deaerator water storage tank 12 and the water supply in each of the supply pipes 19 and 20 do not increase. Therefore, it is possible to improve the safety by preventing the occurrence of the flash phenomenon.

  Moreover, in the water supply apparatus of the power plant of the present embodiment, the descending portions 19a, 20a, 21a descending from the deaerator water storage tank 12 to the first and second feeding pipes 19, 20, 21 and the horizontal portion 19b reaching the boiler. , 20b, 21b, and the blow recovery pipes 38, 40, 42 are connected to the downstream side of the descending portions 19a, 20a, 21a. Therefore, the water supply of the descent | fall part 19a, 20a, 21a in each feed piping 19,20,21 in which the head pressure by the water supply in the deaerator water storage tank 12 acts can be collect | recovered reliably. In this case, the blow recovery pipes 38, 40, 42 are connected to the downstream side of the feed booster pumps 22, 24, 26 in the feed pipes 19, 20, 21, and the booster feed pumps 22, 24, 26 are connected to each other. The water supply of the descent | fall part 19a, 20a, 21a provided in order to ensure the water head pressure by the side of suction can be collect | recovered reliably.

  Further, in the water supply device of the power plant of this embodiment, the blow recovery valves 39, 41, 43 are opened and closed so that the pressure in the deaerator 11 measured by the pressure sensor 44 becomes a predetermined pressure drop rate. I have control. Therefore, by maintaining the pressure in the deaerator 11 at the set pressure, the water supply pressure of each of the supply pipes 19, 20, and 21 is not increased by the water supply of the deaerator water storage tank 12, and it is ensured. Occurrence of the flash phenomenon can be prevented. Further, there is a deviation between the feed water temperature in the deaerator water storage tank 12 measured by the tank temperature sensor 46 and the feed water temperature in each feed pipe 19, 20, 21 measured by each pipe temperature sensor 47, 48, 49. The blow recovery valves 39, 41, and 43 are controlled to be opened and closed so as to be smaller than a preset temperature deviation set in advance. Therefore, since the deviation between the feed water temperature of the deaerator water storage tank 12 and the feed water temperature of each of the feed pipes 19, 20, and 21 is smaller than the set temperature deviation, the occurrence of the flash phenomenon can be surely prevented.

  FIG. 4 is a schematic configuration diagram illustrating a water supply device for a power plant according to a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the water supply apparatus of the power plant according to the second embodiment, as shown in FIG. 4, the deaerator 11 has a deaerator water storage tank 12 at the lower part, and supply of feed water from the condenser to the deaerator 11. A pipe 13 is connected, and a water level control valve 14 and a low pressure heater 15 are provided in the supply pipe 13. In addition, an extraction pipe 16 to which heating steam is supplied is connected to the deaerator 11, and an auxiliary steam pipe 17 to which auxiliary steam is supplied is connected. An auxiliary steam control valve 18 is connected to the auxiliary steam pipe 17. It is installed.

  In addition, at the lower part of the deaerator water storage tank 12, first and second supply pipes 19, 20, 21 for supplying the stored water supply to the boiler are provided. The water supply booster pump 22 and the water supply pump 23 are provided, the water supply booster pumps 24 and 26 and the water supply pumps 25 and 27 are provided in the second supply pipes 20 and 21, and each of the supply pipes 19, 20, and 21 is a set. And connected to the boiler. The deaerator 11 and the deaerator water storage tank 12 are arranged at a position higher than the water supply booster pumps 22, 24, 26 in order to secure the suction pressure of the water supply booster pumps 22, 24, 26. The one supply pipe 19 has a descending part 19a, a horizontal part 19b, and an ascending part (not shown), and the deaerator water storage tank 12 and the descending part 19a of the first feeding pipe 19 are arranged downstream of the descending part 19a. A first water supply circulation pipe 34 for circulating water is branched and provided, and the first water supply circulation pipe 34 is connected to the downstream side of the low-pressure heater 15 in the supply pipe 13.

  The second supply pipes 20 and 21 have descending portions 20a and 21a, horizontal portions 20b and 21b, and an unillustrated ascending portion, and the deaerator water storage tank 12 and the downstream of the descending portions 20a and 21a. The second water supply circulation pipes 35 and 36 for circulating the water in the descending portions 20a and 21a of the second supply pipes 20 and 21 are branched and provided, and the second water supply circulation pipes 35 and 36 are low-pressure heaters in the supply pipe 13. 15 is connected to the downstream side. The first water supply circulation pipe 34 and the second water supply circulation pipes 35 and 36 are connected to the supply pipe 13 at the downstream side, and a water supply circulation pump 37 is provided in the middle.

  In this embodiment, a pressure sensor 44 that measures the pressure in the deaerator 11 is provided, and the measurement result of the pressure sensor 44 is output to the control device 45. The feed water circulation pump 37 is driven and controlled so that the measured pressure in the deaerator 11 becomes a predetermined pressure drop rate.

  In the present embodiment, a tank temperature sensor 46 that measures the temperature of the water supply in the deaerator water storage tank 12, a pipe temperature sensor 47 that measures the temperature of the water supply in the descending portion 19 a of the first supply pipe 19, Pipe temperature sensors 48 and 49 for measuring the temperature of the feed water in the descending portions 20a and 21a of the second feed pipes 20 and 21 are provided, and the measurement results of the temperature sensors 46, 47, 48 and 49 are controlled. It is output to the device 45. And this control apparatus 45 is the 1st, 2nd feed piping 19 and 20 which the feed water temperature in the deaerator water storage tank 12 measured by the tank temperature sensor 46, and each piping pressure sensor 47,48,49 measured. , 21 is controlled to drive the feed water circulation pump 37 so that the deviation from the feed water temperature in the descending portions 19a, 20a, 21a is smaller than a preset temperature deviation.

  Therefore, during normal load operation of the plant, water is supplied from the condenser to the deaerator 11 through the supply pipe 13, and this water supply is free from impurities such as dissolved oxygen by the heated steam supplied from the extraction pipe 16. Deaerated and the feed water is stored in the deaerator water storage tank 12. On the other hand, the feed water stored in the deaerator water storage tank 12 is fed to the boiler through the second feed pipe 20 by driving the feed booster pump 23 and the feed water pump 24.

  By the way, during the normal load operation of the plant, the pressure of the deaerator 11 may decrease due to some cause or by intentionally reducing the operation load. At this time, in the first feed pipe 19 (and one of the second feed pipes 20 and 21) in which the water supply is stopped, the low-temperature feed water of the deaerator water storage tank 12 and the first feed pipe 19 A pressure difference and a temperature difference are generated between the remaining high-temperature water supply, and water hammer and a flash phenomenon occur in each of the supply pipes 19 and 20.

  Therefore, in this embodiment, the control device 45 includes the feed water temperature in the deaerator water storage tank 12 measured by the tank temperature sensor 46 and the feed pipes 19 and 20 measured by the pipe temperature sensors 47, 48 and 49. , 21 by controlling the feed water circulation pump 37 so that the deviation from the feed water temperature in the descending portions 19a, 20a, 21a is smaller than the set temperature deviation, the feed water of the deaerator water storage tank 12 and each feed pipe The occurrence of a water hammer or a flash phenomenon due to a temperature difference from the water supply in the 19, 20, 21 is prevented.

  Further, when the plant is stopped for some reason during normal load operation of the plant, the supply of water supply from the condenser to the deaerator 12 is stopped by closing the water level control valve 14. Then, the supply of the heating steam is stopped, and the deaeration process of the feed water in the deaerator 11 is stopped. At this time, the pressure in the deaerator 11 and the deaerator water storage tank 12 hardly decreases, and the temperature of the feed water staying in the deaerator water tank 12 and each of the supply pipes 19, 20, 21 hardly decreases. Thus, the state of the load operation immediately before the stop is maintained.

  Thereafter, when the plant can be restored and restarted, the water level control valve 14 is opened, so that water is supplied from the condenser to the deaerator 11 and auxiliary steam is supplied. Deaerated and the feed water is stored in the deaerator water storage tank 12. On the other hand, the feed booster pump 22 and the feed pump 23 are driven to start feeding the boiler through the first feed pipe 19 of the feed water stored in the deaerator water storage tank 12.

  However, when the plant is restarted, low temperature feed water is supplied from the condenser to the deaerator 11 and subjected to deaeration treatment, and then the low temperature feed water is stored in the deaerator water storage tank 12, so that the high temperature state is reached. The pressure and temperature of the feed water in the deaerator water storage tank 12 maintained are lowered. On the other hand, since the feed water booster pumps 22, 24, 26 and the feed water pumps 23, 25, 27 are stopped in the first and second feed pipes 19, 20, 21 until the time of restarting the plant, 1. High temperature feed water stays in the second feed pipes 19, 20, and 21. Therefore, a pressure difference and a temperature difference are generated between the low-temperature water supply in the deaerator water storage tank 12 and the high-temperature water supply remaining in the first and second supply pipes 19, 20, and 21. , 20 and 21 will cause a flash phenomenon.

  Therefore, in this embodiment, after the plant is stopped, the control device 45 drives and controls the feed water circulation pump 37 so that the pressure in the deaerator 11 measured by the pressure sensor 44 becomes a predetermined pressure drop rate. This prevents the occurrence of a water hammer or a flash phenomenon due to a temperature difference between the water supply in the deaerator water storage tank 12 and the water supply in each of the supply pipes 19, 20, 21.

  Further, in this embodiment, the occurrence of the flash phenomenon can be prevented by the temperature deviation of the water supply instead of the pressure drop rate of the water supply. That is, the control device 45 controls the water supply temperature in the deaerator water storage tank 12 measured by the tank temperature sensor 46 and the descending portion of each feed pipe 19, 20, 21 measured by each pipe temperature sensor 47, 48, 49. The feed water circulation pump 37 is driven and controlled so that the deviation from the feed water temperature in 19a, 20a, 21a is smaller than the set temperature deviation, so that the feed water in the deaerator water storage tank 12 and each feed pipe 19, 20, 21 are controlled. The flash phenomenon is prevented from occurring due to the temperature difference from the water supply inside.

  Therefore, the water supply in the deaerator storage tank 12 and the water supply in the supply pipes 19, 20, 21 flow to the supply pipe 13 through the first and second supply water circulation pipes 34, 35, 36, and further, the deaerator storage tank Return to 12. As a result, the pressure in the deaerator 11 decreases, the water supply temperature in the deaerator water storage tank 12 and the water supply temperature in the supply pipes 19, 20, 21 decrease, and the flash phenomenon due to the pressure difference and temperature difference between the two. Is prevented from occurring.

  As described above, in the water supply device for the power plant according to the second embodiment, water is supplied to the boiler at the time of startup of the plant to the lower part of the deaerator water storage tank 12 for storing the water deaerated by the deaerator 11. The first supply pipe 19 is connected to the second supply pipes 20 and 21 for supplying water to the boiler after the plant is started, and branched from the middle of the first and second supply pipes 19, 20, and 21. Then, the water supply circulation pipes 34, 35, 36 for returning the water supply in the respective supply pipes 19, 20, 21 to the deaerator 11 are provided, the water supply circulation pump 37 is attached, and the pressure for measuring the pressure of the deaerator 11 is measured. A sensor 44, a tank temperature sensor 46 for measuring the temperature of the feed water stored in the deaerator water storage tank 12, and pipe temperature sensors 47, 48, 49 for measuring the temperature in each of the supply pipes 19, 20, 21. The control device 45 includes sensors 44 and 46. And drives and controls the water supply circulation pump 37 on the basis of 47, 48, 49 of the measurement results.

  Therefore, when the plant is restarted, the feed water from the condenser is supplied to the deaerator 11 through the supply pipe 13, so that the pressure in the deaerator 11 and the temperature of the feed water in the deaerator water storage tank 12 are increased. The pressure difference and the temperature difference with the feed water staying in the first and second supply pipes 19, 20, and 21 are generated, but the control device 45 may change the pressure of the deaerator 11 or the deaerator. The feed water circulation pump 37 is driven and controlled based on the feed water temperature change of the water storage tank 12, and the high temperature feed water staying in the first and second feed pipes 19, 20, 21 is fed to the feed water circulation pipes 34, 35, Since the temperature is lowered by returning to the deaerator 11 through 36, the pressure difference and the temperature difference between the water supply of the deaerator water storage tank 12 and the water supply of each of the feed pipes 19, 20, 21 are increased. To prevent the occurrence of flash phenomenon and improve safety It can be.

  Moreover, in the water supply apparatus of the power plant of a present Example, descent | fall part 19a, 20a, 21a and horizontal part 19b, 20b which descend | fall from the deaerator water storage tank 12 to the 1st, 2nd supply piping 19,20,21, 21b is provided, and the water supply circulation pipes 34, 35 and 36 are connected to the downstream side of the descending portions 19a, 20a and 21a. Therefore, the water supply of the descent | fall part 19a, 20a, 21a in each feed piping 19,20,21 in which the head pressure by the water supply in the deaerator water storage tank 12 acts can be reliably returned to the deaerator 11. FIG.

  Moreover, in the water supply apparatus of the power plant of the present embodiment, the feed water circulation pump 37 is driven and controlled so that the pressure in the deaerator 11 measured by the pressure sensor 44 becomes a predetermined pressure drop rate. . Therefore, the pressure reduction rate in the deaerator 11 is maintained at a predetermined pressure reduction rate, so that the water supply pressure of each of the supply pipes 19, 20, and 21 is increased by the water supply of the deaerator water storage tank 12. However, the flash phenomenon can be surely prevented. Further, there is a deviation between the feed water temperature in the deaerator water storage tank 12 measured by the tank temperature sensor 46 and the feed water temperature in each feed pipe 19, 20, 21 measured by each pipe temperature sensor 47, 48, 49. The feed water circulation pump 37 is driven and controlled so as to be smaller than a preset temperature deviation set in advance. Therefore, since the deviation between the feed water temperature of the deaerator water storage tank 12 and the feed water temperature of each of the feed pipes 19, 20, and 21 is smaller than the set temperature deviation, the occurrence of the flash phenomenon can be surely prevented.

  In Example 2, the first and second water supply circulation pipes 34, 35, and 36 are connected to the downstream sides of the descending portions 19a, 20a, and 21a of the first and second water supply pipes 19, 20, and 21, respectively. You may connect with the horizontal parts 19b, 20b, and 21b.

  Further, in each of the above-described embodiments, the control device 45 is configured so that the pressure in the deaerator 11 measured by the pressure sensor 44 becomes a predetermined pressure drop rate set in advance, or the tank temperature sensor 46 is A preset temperature deviation in which a deviation between the measured feed water temperature in the deaerator water storage tank 12 and the feed water temperature in each feed pipe 19, 20, 21 measured by each pipe temperature sensor 47, 48, 49 is set in advance. The blow recovery valves 39, 41, and 43 are controlled to be opened and closed and the feed water circulation pump 37 is driven so as to be smaller. However, the present invention is not limited to this configuration. That is, the improvement of the flash phenomenon is largely due to the pressure in the air vessel 11, but when the plant load increases, the pressure control becomes difficult. Therefore, when the plant load is smaller than the predetermined value, the blow recovery valves 39, 41, 43 and the feed water circulation pump 37 are driven and controlled so that the pressure in the deaerator 11 becomes a predetermined pressure drop rate. When it is larger than the predetermined value, the blow recovery valves 39, 41, 43, and so on so that the deviation between the feed water temperature in the deaerator water storage tank 12 and the feed water temperature in the feed pipes 19, 20, 21 is smaller than the set temperature deviation. The feed water circulation pump 37 may be configured to be driven and controlled.

  The water supply device for a power plant according to the present invention prevents the occurrence of a flash phenomenon that occurs at the time of startup of the plant, and can be applied to any type of water supply device for a power plant.

It is a schematic block diagram showing the water supply apparatus of the power plant which concerns on Example 1 of this invention. It is a graph showing the pressure change of the water supply in the deaerator water storage tank in the water supply apparatus of the power plant of Example 1. FIG. It is a graph showing the temperature change of the water supply in the deaerator water storage tank in the water supply apparatus of the power plant of Example 1, and the water supply in a 2nd supply piping. It is a schematic block diagram showing the water supply apparatus of the power plant which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Deaerator 12 Deaerator water storage tank 13 Supply pipe 14 Water level control valve 19 1st feed pipe 19a Drop part 20,21 2nd feed pipe 20a, 21a Horizontal part 22,24,26 Feed booster pump 23,25 , 27 Water supply pump 34 First water supply circulation pipe 35, 36 Second water supply circulation pipe 37 Water supply circulation pump 38 First blow recovery pipe 39, 41, 43 Blow recovery valve 40, 42 Second blow recovery pipe 44 Pressure sensor (measuring means) )
45 Control device (control means)
46 Tank temperature sensor (measuring means)
47, 48, 49 Piping temperature sensor (measuring means)

Claims (4)

A deaerator for degassing the feed water to remove impurities, a supply pipe for supplying feed water from a condenser to the deaerator, and a deaerator water storage tank for storing the feed water deaerated by the deaerator A feed pipe connected to the lower part of the deaerator water storage tank for feeding the plant feed water to the boiler, and branching from a midway of the feed pipe to feed the feed water in the feed pipe to the condensate Blow recovery pipe to be recovered in the vessel, a blow recovery valve provided in the blow recovery pipe, a tank temperature sensor for measuring the temperature of the feed water in the deaerator water storage tank, and the temperature of the feed water in the feed pipe The difference between the measuring means comprising the piping temperature sensor and the tank water temperature measured by the tank temperature sensor when the load drops after the load is cut off and during normal load operation and the piping water temperature measured by the pipe temperature sensor is Less than preset temperature deviation The blow recovery valve that and control means for opening and closing control such that the water supply device of the power plant according to claim. A deaerator for degassing the feed water to remove impurities, a supply pipe for supplying feed water from a condenser to the deaerator, and a deaerator water storage tank for storing the feed water deaerated by the deaerator A feed pipe connected to the lower part of the deaerator water storage tank for feeding the plant feed water to the boiler, and branching from a midway of the feed pipe to feed the feed water in the feed pipe to the condensate Blow recovery piping to be recovered in the vessel, a blow recovery valve provided in the blow recovery piping, a pressure sensor for measuring the pressure in the deaerator, and a tank for measuring the temperature of the feed water in the deaerator water storage tank Measuring means comprising a temperature sensor and a pipe temperature sensor for measuring the temperature of the feed water of the supply pipe, and after the load is cut off, the deaerator pressure measured by the pressure sensor drops at a predetermined pressure change rate. While the blow recovery valve is controlled to open and close When the load drops during operation, the blow recovery valve is configured such that a deviation between a tank feed water temperature measured by the tank temperature sensor and a pipe feed water temperature measured by the pipe temperature sensor is smaller than a preset temperature deviation. A water supply device for a power plant, comprising control means for controlling opening and closing of the power plant. A deaerator for degassing the feed water to remove impurities, a supply pipe for supplying feed water from a condenser to the deaerator, and a deaerator water storage tank for storing the feed water deaerated by the deaerator A feed pipe connected to the lower part of the deaerator water storage tank for feeding plant water to the boiler, and branching from a midway of the feed pipe to feed the feed water in the feed pipe to the deaeration A feed water circulation pipe to be returned to the water supply unit, a feed water circulation pump provided in the feed water circulation pipe, a tank temperature sensor for measuring the temperature of the feed water in the deaerator water storage tank, and a temperature of the feed water in the feed pipe The deviation between the measuring means composed of the pipe temperature sensor and the tank water temperature measured by the tank temperature sensor and the pipe water temperature measured by the pipe temperature sensor when the load drops after the load is interrupted and during normal load operation Less than the set temperature deviation Water supply apparatus of the power plant, characterized in that it comprises a control means for driving and controlling the urchin the water supply circulation pump. A deaerator for degassing the feed water to remove impurities, a supply pipe for supplying feed water from a condenser to the deaerator, and a deaerator water storage tank for storing the feed water deaerated by the deaerator A feed pipe connected to the lower part of the deaerator water storage tank for feeding plant water to the boiler, and branching from a midway of the feed pipe to feed the feed water in the feed pipe to the deaeration A feed water circulation pipe to be returned to the water tank, a feed water circulation pump provided in the feed water circulation pipe, a pressure sensor for measuring the pressure in the deaerator, and a tank temperature for measuring the temperature of the feed water in the deaerator water storage tank measuring means consisting of a pipe temperature sensor for measuring the temperature of the feed water of the feed piping and sensors, lowered at a predetermined pressure change rate after load rejection deaerator pressure the pressure sensor is measured is set in advance While controlling the drive of the feed water circulation pump, When the medium load drops, the feed water circulation pump is set so that the deviation between the tank feed water temperature measured by the tank temperature sensor and the pipe feed water temperature measured by the pipe temperature sensor is smaller than a preset temperature deviation. A water supply device for a power plant, characterized by comprising control means for drive control.

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