JP2011085041A - Thermal power generation equipment and method of operating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide thermal power generation equipment capable of excellently generating power in response to conditions, restricting wasted consumption of energy in a circulating water system in the starting operation and in the stopping operation. <P>SOLUTION: This thermal power generation equipment includes: a steam turbine for driving a power generator; a condenser for condensing the steam discharged form the steam turbine into water; a boiler for heating the water from the condenser to convert it to steam; and two or more circulation pumps for supplying cooling water to the condenser. When output of a generator is in a low-output region lower than a rated output region, at least any one of the circulation pumps is stopped and the residual circulation pump is driven, and on the other hand, when output of the generator is in a high-output region higher than the low-output region including the rated output region, all the circulation pumps are driven. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a thermal power generation facility and a method for operating the thermal power generation facility. More specifically, the present invention includes a circulation pump that supplies cooling water to a condenser so that steam from a steam turbine that drives the generator is returned to water. The present invention relates to a thermal power generation facility and a method for operating the thermal power generation facility.

  Generally, a thermal power generation facility includes a boiler that heats water to make steam, a steam turbine that is driven by steam generated by the boiler, a generator that generates power by being driven by the steam turbine, and a steam turbine In order to cool the steam with the condenser, the condenser for cooling the steam discharged from the water into saturated water, the feed pump that supplies the water obtained by the condenser to the boiler, And a circulation pump for supplying cooling water to the condenser.

  In other words, this type of thermal power generation equipment includes a condensate / water supply system for supplying water obtained by the condenser to the boiler, a steam system for sending the steam obtained by the boiler to the condenser, A circulating water system for supplying cooling water to the water device, a feed water pump in the condensate / feed water system, a steam turbine in the steam system, and a circulation pump in the circulating water system.

  Two or more water supply pumps are provided, and a part (at least one) of the water supply pumps is constituted by an electric pump (hereinafter referred to as an electric water supply pump), and the remaining water supply pumps are steam turbine type. It is comprised with the pump (henceforth a steam drive type feed water pump). Along with this, the condensate / water supply system supplies water to the boiler with an electric water pump when the output of the generator is small (when the heat load on the condenser is small), and during the rated operation when the output of the generator is high ( When the heat load on the condenser is large), the steam is supplied to the boiler by a steam-driven feed water pump.

  In addition, two or more circulation pumps are provided, and in a state where the output of the generator is large (in a state where the heat load on the condenser is large) as in rated operation, Cooling water is supplied to the condenser (see, for example, Patent Documents 1 to 3).

  In the start-up operation in which the thermal power generation facility starts operation, a part of the two or more circulation pumps (for example, one circulation pump when two circulation pumps are provided) After driving the steam and supplying the cooling water to the condenser, the steam turbine is driven to cause the generator to generate power, and the output of the generator is set to the lower limit value of the low output range lower than the preset rated output range. When the power reaches, the remaining circulating pump that has been in a stopped state is driven in conjunction with transmitting the power generated by the generator (in a parallel state). That is, the thermal power generation equipment is set in a state in which some circulation pumps are driven in advance so that steam can be cooled by the condenser, and the output of the generator gradually increases (the heat load of the condenser increases). Based on this, all the circulation pumps are driven in a state where the output of the generator is in a low output range, and cooling water is supplied to the condenser.

  In addition, the thermal power generation facility, in the stop operation to stop the operation, gradually reduce the steam supplied from the boiler to the steam turbine to reduce the output of the generator, the output of the low output region is lower than the rated output region When the lower limit value is reached, a part of the circulation pumps (for example, one unit when two circulation pumps are provided) in addition to stopping the transmission of the electric power generated by the generator (to be disconnected) The other circulation pumps that have been in the drive state after the steam turbine has stopped are stopped. That is, since the thermal power generation facility is in a parallel state even when the output of the generator reaches a low output range, all the circulation pumps are driven, and the output of the generator cannot transmit power (in a parallel state). However, some circulation pumps are stopped when the output becomes very small, and all circulation pumps are stopped in a state where the heat load is not completely applied to the condenser.

Japanese Patent Publication No.46-28046 JP 2007-107761 A JP-A-6-249586

  Incidentally, since the output of the generator in the start operation and the stop operation is in a low output region lower than the rated output region as described above, the heat load of the condenser during the start operation and the stop operation is normal operation ( The output of the generator is smaller than the operating state in the rated output range.

  However, in the conventional thermal power generation facilities, all the circulation pumps are driven in a state where the output of the generator is in a low output range (a state where the heat load on the condenser is small). In operation, there has been a problem that excessive cooling water is supplied to the condenser and energy for driving the circulating water system (energy for driving the circulation pump) is wasted.

  Therefore, the present invention provides a thermal power generation facility capable of suppressing wasteful consumption of energy in the circulating water system during start-up operation and stop operation, and capable of performing stable power generation during rated operation, and a method for operating the thermal power generation facility. The issue is to provide.

  A thermal power generation facility according to the present invention includes a boiler that heats water into steam, a steam turbine that is driven by steam generated by the boiler, a generator that generates power by being driven by the steam turbine, and a steam turbine Power generator with a condenser for cooling the steam discharged from the water into water and two or more circulation pumps for supplying cooling water to the condenser to cool the steam with the condenser In the facility, when the output of the generator is in a low output range lower than the rated output range, a part of the two or more circulation pumps is driven, and the output of the generator is lower than the low output range. In the high output range including the high rated output range, the circulation pump is configured to drive a larger number of circulation pumps than when the output of the generator is in the low output range. Here, the “rated output range” means an output range during rated (stable) operation of the generator, which is a design specification of the thermal power generation facility. The “high output range” means a range that is continuous on the high output side with respect to the low output range and includes the rated output range. In other words, “high output range” means that the high output range itself is the rated output range, as well as the intermediate output range and the rated output range set between the low output range and the rated output range. This is a concept that includes the output region.

  The thermal power generation facility with the above configuration drives a part of the circulation pumps of the two or more circulation pumps when the output of the generator is in a low output range lower than the rated output range. When the heat load is small, the minimum necessary circulating pump can be driven to supply the minimum necessary cooling water according to the heat load of the condenser.

  In addition, the thermal power generation facility has a larger number of generators than when the generator output is in the low output range when the output of the generator is in a high output range including the rated output range higher than the low output range. Since the circulation pump is driven, the necessary cooling water can be supplied to the heat load of the condenser when the heat load to the condenser is large.

  Therefore, according to the thermal power generation facility configured as described above, energy that drives the circulating water system (energy that drives the circulation pump) is wasted in a state where the output of the generator is in a low output range lower than the rated output range. In addition, in a state where the output of the generator is in the rated output range, it is possible to prevent the heat load of the condenser from becoming excessive and to perform stable power generation.

  A thermal power generation facility according to the present invention includes a boiler that heats water into steam, a steam turbine that is driven by steam generated by the boiler, a generator that generates power by being driven by the steam turbine, and a steam turbine In order to cool the steam with the condenser, the condenser for cooling the steam discharged from the water, two or more water supply pumps that supply the boiler with the water obtained by the condenser, Two or more circulation pumps for supplying cooling water to the condenser, and a part of the two or more water supply pumps is composed of an electric water supply pump that is electrically driven, and the remaining water supply pumps Is composed of a steam-driven feed pump driven by steam from the boiler, and when the output of the generator is in a low output range lower than the rated output range, the electric feed pump is driven, and the output of the generator is low Set within the output range between the output range and the rated output range. In a thermal power generation facility configured to drive the steam-driven feed water pump when the set value is greater than or equal to the set value, when the electric feed water pump is driven, some of the two or more circulation pumps When the circulation pump is driven and the steam-driven feed water pump is driven, the circulation pump is configured to drive a larger number of circulation pumps than when the electric feed water pump is driven. . Here, the “rated output range” means an output range during rated (stable) operation of the generator, which is a design specification of the thermal power generation facility.

  The thermal power generation facility having the above configuration drives an electric water supply pump that is driven when the output of the generator is in a low output range lower than the rated output range, and when the electric water supply pump is driven, When the heat load on the condenser is small to drive some of the circulation pumps above the stand, the necessary minimum circulation pump is driven and the minimum necessary according to the heat load of the condenser Limited amount of cooling water can be supplied.

  The thermal power generation facility drives the steam-driven feed water pump when the output of the generator is equal to or higher than a set value set in an output range between the low output range and the rated output range, and the steam drive When the water supply pump is being driven, a larger number of circulation pumps are driven than when the electric water supply pump is being driven. Therefore, when the heat load on the condenser is large, the heat load of the condenser Necessary cooling water can be supplied.

  Therefore, according to the thermal power generation facility configured as described above, energy that drives the circulating water system (energy that drives the circulation pump) is wasted in a state where the output of the generator is in a low output range lower than the rated output range. In addition, in a state where the output of the generator is in the rated output range, it is possible to prevent the heat load of the condenser from becoming excessive and to perform stable power generation.

  An operation method of a thermal power generation facility according to the present invention includes a boiler that heats water to make steam, a steam turbine that is driven by steam generated by the boiler, and a generator that generates power by being driven by the steam turbine, , Equipped with a condenser for cooling the steam discharged from the steam turbine into water, and two or more circulation pumps for supplying cooling water to the condenser for cooling the steam with the condenser In the operation method of the thermal power plant, when the output of the generator is in a low output range lower than the rated output range, some of the two or more circulation pumps are driven to output the generator Is in a high output range including a higher rated output range than the low output range, and more circulating pumps are driven than when the generator output is in the low output range. Here, the “rated output range” means an output range during rated (stable) operation of the generator, which is a design specification of the operation method of the thermal power generation facility. The “high output range” means a range that is continuous on the high output side with respect to the low output range and includes the rated output range. In other words, “high output range” means that the high output range itself is the rated output range, as well as the intermediate output range and the rated output range set between the low output range and the rated output range. This is a concept that includes the output region.

  The operation method of the thermal power generation facility with the above configuration is to restore some of the circulation pumps of the two or more circulation pumps when the output of the generator is in a low output range lower than the rated output range. When the heat load on the water device is small, the minimum necessary amount of cooling water corresponding to the heat load of the condenser can be supplied by driving the minimum necessary circulation pump.

  Further, the operation method of the thermal power generation facility is such that when the output of the generator is in a high output range including a rated output range higher than the low output range, the output of the generator is in a low output range. Since a large number of circulation pumps are driven, it is possible to supply necessary cooling water to the heat load of the condenser when the heat load on the condenser is large.

  Therefore, according to the operation method of the thermal power generation facility having the above configuration, energy for driving the circulating water system (energy for driving the circulation pump) is wasted in a state where the output of the generator is in a low output range lower than the rated output range. Consumption can be prevented, and in the state where the output of the generator is in the rated output range, the heat load of the condenser can be prevented from becoming excessive, and stable power generation can be performed.

  An operation method of a thermal power generation facility according to the present invention includes a boiler that heats water to make steam, a steam turbine that is driven by steam generated by the boiler, and a generator that generates power by being driven by the steam turbine, , A condenser for cooling the steam discharged from the steam turbine into water, two or more water supply pumps supplying the boiler with water obtained by the condenser, and cooling the steam with the condenser Therefore, it comprises two or more circulation pumps for supplying cooling water to the condenser, and a part of the two or more water supply pumps is composed of an electric water supply pump that is electrically driven, and the rest The water supply pump is composed of a steam-driven feed water pump that is driven by steam from the boiler, and when the generator output is in a low output range lower than the rated output range, the electric feed pump is driven and the generator output Is the output range between the low output range and the rated output range In the operation method of the thermal power generation equipment configured to drive the steam-driven feed water pump when the set value is equal to or greater than the set value, the two or more circulation pumps when the electric feed water pump is driven When one of the circulation pumps is driven and the steam-driven feed water pump is being driven, a larger number of circulation pumps are driven than when the electric feed water pump is being driven. . Here, the “rated output range” means an output range during rated (stable) operation of the generator, which is a design specification of the operation method of the thermal power generation facility.

  The operation method of the thermal power generation facility having the above configuration is such that when the output of the generator is in a low output range lower than the rated output range, the electric feed pump that is driven is driven, and the electric feed pump is being driven. In order to drive some of the two or more circulation pumps, when the heat load on the condenser is small, the minimum necessary circulation pump is driven to meet the heat load of the condenser. The minimum necessary amount of cooling water can be supplied.

  Further, the operation method of the thermal power generation facility, when the output of the generator is equal to or higher than a set value set in the output range between the low output range and the rated output range, to drive the steam-driven feed water pump, When the steam-driven water supply pump is being driven, a larger number of circulation pumps are driven than when the electric water supply pump is being driven. Necessary cooling water can be supplied with respect to the heat load.

  Therefore, according to the operation method of the thermal power generation facility having the above configuration, energy for driving the circulating water system (energy for driving the circulation pump) is wasted in a state where the output of the generator is in a low output range lower than the rated output range. Consumption can be prevented, and in the state where the output of the generator is in the rated output range, the heat load of the condenser can be prevented from becoming excessive, and stable power generation can be performed.

  As described above, according to the thermal power generation facility according to the present invention, it is possible to suppress wasteful consumption of energy in the circulating water system during start-up operation and stop operation, and it is possible to perform stable power generation during rated operation. The effects can be achieved.

  Further, according to the operation method of the thermal power generation facility according to the present invention, it is possible to suppress wasteful consumption of energy in the circulating water system during start-up operation and stop operation, and it is possible to perform stable power generation during rated operation. The effects can be achieved.

1 shows a schematic conceptual diagram of a thermal power generation facility according to an embodiment of the present invention. The conceptual diagram of the condenser and circulating water system of the thermal power generation equipment which concerns on the embodiment is shown.

  Hereinafter, a thermal power generation facility according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, such a thermal power generation facility includes a boiler 10 that heats water into steam, steam turbines 20, 21, 22, 23 driven by steam generated in the boiler 10, and the steam turbine 20. , 21, 22, 23 to generate electric power, and a condenser 40 for cooling the steam discharged from the steam turbines 20, 21, 22, 23 into water (saturated water), Two or more water supply pumps 50 and 51 for supplying water obtained by the condenser 40 to the boiler 10 and two units for supplying cooling water to the condenser 40 in order to cool the steam by the condenser 40 The above circulation pumps 60 and 61 are provided.

  That is, the thermal power generation facility 1 includes a condensate / water supply system WL for supplying water obtained by the condenser 40 to the boiler 10, and steam for sending the steam obtained by the boiler 10 to the condenser 40. A system SL and a circulating water system RL for supplying cooling water to the condenser 40 are provided. The thermal power generation facility 1 includes feed water pumps 50 and 51 in the condensate / feed water system WL, steam turbines 20, 21, 22, and 23 in the steam system SL, and circulation pumps 60 and 61 in the circulating water system RL. Is installed.

  The boiler 10 includes an evaporator 11 that evaporates water supplied from the condensate / water supply system WL, a superheater 12 that superheats saturated steam evaporated by the evaporator 11, and an evaporation turbine (a high-pressure turbine described later) 20. And a reheater 13 for overheating the exhaust gas. The boiler 10 according to the present embodiment supplies the steam superheated by the superheater 12 to the steam turbine (high-pressure turbine) 20 and the steam superheated by the reheater 13 in another steam turbine (the first stage described later). (Pressure turbine) 21 is supplied.

  The thermal power generation facility 1 according to the present embodiment includes a high pressure turbine 20, an intermediate pressure turbine 21, 22, and a low pressure turbine 23 as steam turbines 20, 21, 22, 23. Are provided one by one, and two intermediate pressure turbines 21 and 22 are provided.

  These steam turbines 20, 21, 22, and 23 are arranged in parallel so that their output shafts are coaxial in the order of the high-pressure turbine 20, the intermediate-pressure turbine 21, the intermediate-pressure turbine 22, and the low-pressure turbine 23, The output shaft is connected to the output shafts of the adjacent steam turbines 20, 21, 22, 23. The generator 30 is arranged side by side with respect to the steam turbines 20, 21, 22, and 23, and the input shaft is connected to the output shaft of the low-pressure turbine 23. Thereby, the generator 30 receives the drive of the high pressure turbine 20, the intermediate pressure turbines 21 and 22, and the low pressure turbine 23 to generate power.

  The condenser 40 cools the exhaust (steam) of the steam turbines 22 and 23 into water, and in this embodiment, as shown in FIG. 2, the steam turbines 22 and 23 (in the second stage) A housing 400 that defines an internal space into which steam from the pressure turbine 22 and the low-pressure turbine 23) is introduced, and a cooling pipe 401 that is disposed in the housing 400 and distributes the cooling water from the circulating water system RL. The steam introduced into the housing 400 is indirectly cooled by the cooling water in the cooling pipe 401, thereby condensing the steam into water. That is, the surface condenser is employ | adopted for the condenser 40 which concerns on this embodiment.

  In the thermal power generation facility 1 according to the present embodiment, two condensers 40, 40 having the above-described configuration are arranged in parallel, and the exhaust (steam) of the steam turbines 22, 23 is connected to each condenser 40. In addition, water (saturated water) obtained by condensing steam from each condenser 40 can be supplied to the condensate / water supply system WL.

  Returning to FIG. 1, the condensate / water supply system WL is a system for supplying water from the condenser 40 to the boiler 10 as described above, and includes two or more water supply pumps 50 and 51 as described above. ing. Here, the condensate / water supply system WL will be described in detail. The condensate / water supply system WL according to the present embodiment includes a condensate pump 52 that sucks water from the condenser 40 and sends the water downstream. A low pressure feed water heater (low pressure heater) 53 that heats the water sent out by the water pump 52, a deaerator 54 that separates and removes dissolved gas in the water heated by the low pressure feed water heater 53, and a deaerator 54 The two or more water supply pumps 50 and 51 for sending water from the downstream to the downstream side, and a high-pressure water heater (high-pressure heater) 55 for heating the water sent by the water supply pumps 50 and 51 are provided. The water heated by the heater 55 is supplied to the boiler 10.

  The low-pressure feed water heater 53 and the high-pressure feed water heater 55 are the same type of feed water heater, and heat water by exhaust from the steam turbines 20, 21, 22, and 23. Note that these feed water heaters 53 and 55 are named based on the arrangement of the feed water pumps 50 and 51, and normally the feed water heater 53 located on the condenser 40 side of the feed water pumps 50 and 51 has a low pressure. The feed water heater 55 is referred to as a feed water heater, and the feed water heater 55 located closer to the boiler 10 than the feed water pumps 50 and 51 is referred to as a high pressure feed water heater.

  Two or more of the water supply pumps 50 and 51 are provided as described above, and a part of the water supply pumps 50 is constituted by an electric pump that is electrically driven, and the remaining water supply pumps 51 are driven by steam. It consists of a steam turbine pump. In the present embodiment, two water supply pumps 50 and 51 are provided, and one of the water supply pumps 50 is electrically driven (hereinafter, this water supply pump 50 is referred to as an electric water supply pump). It is comprised and the remaining one feed pump 51 is comprised with the steam turbine type pump (henceforth this feed pump 51 is called a steam drive type feed pump) which drives with steam.

  The electric water supply pump 50 is driven when the output of the generator 30 is in a low output range lower than the rated output range. On the other hand, the steam-driven feed water pump 51 is driven when the output of the generator 30 is equal to or higher than a set value set in the output range between the low output range and the rated output range. . That is, the steam-driven feed water pump 51 is driven when the output of the generator is equal to or higher than a preset value within a lower limit range of a high output range including a rated output range higher than the low output range. It has become. Here, the “rated output range” means an output range during rated (stable) operation of the generator 30, which is a design specification of the thermal power generation facility 1, and in this embodiment, the “high output range” This means a range that is continuous on the high output side with respect to the low output range, and that combines the intermediate output range and the rated output range set between the low output range and the rated output range.

  Therefore, the condensate / water supply system WL of the thermal power generation facility 1 according to the present embodiment has a low output of the generator 30 and a small thermal load on the condenser 40 as in the start-up operation and the stop operation. Water is supplied to the boiler 10 by the electric water supply pump 50, and water is supplied to the boiler 10 by the steam-driven water supply pump 51 when the output of the generator 30 is large and the heat load on the condenser 40 is large as in rated operation. It is like that. That is, the condensate / water supply system WL according to the present embodiment is a water supply pump that is driven when the output of the generator 30 reaches a set value set in the output range between the low output range and the rated output range. 50 and 51 are switched from the electric feed pump 50 to the steam-driven feed pump 51 or from the steam-driven feed pump 51 to the electric feed pump 50.

  The steam system SL includes a first steam line SL1 that connects the boiler 10 and the intake side of the high-pressure turbine 20, and the high-pressure turbine on the assumption that the steam turbines 20, 21, 22, and 23 are arranged as described above. The second steam line SL2 connecting the exhaust side of 20 and the reheater 13 in the boiler 10, and the third steam pipe connecting the reheater 13 and the intake side of one (first stage) intermediate pressure turbine 21. Path SL3, a fourth steam line SL4 connecting the exhaust side of one (first stage) intermediate pressure turbine 21 and the intake side of the other (second stage) intermediate pressure turbine 22 and the intake side of the low pressure turbine 23, The other (second stage) intermediate-pressure turbine 22 is provided with a fifth steam line SL5 that connects the exhaust side of the low-pressure turbine 23 and the exhaust side of the low-pressure turbine 23 to the condenser 40.

  In addition, the steam system SL of the thermal power generation facility 1 according to the present embodiment is connected to the steam line SL1 to SL5 described above and the first steam line SL1 that connects the boiler 10 and the high-pressure turbine 20 via the valve B. A bypass pipe SL6 that branches and connects to the condenser 40 is provided.

  As described above, the circulating water system RL includes two or more circulating pumps 60 and 61. In the present embodiment, the circulating water system RL includes two circulating pumps 60 and 61. Here, the circulating water system RL will be described in detail. The circulating water system RL according to the present embodiment includes an intake channel 62 connected to a water source (in the present embodiment, the sea) and a water source to the intake channel 62 as shown in FIG. The two circulating pumps 60 and 61 for supplying the cooling water taken into the condenser 40 to the condenser 40, and the water discharge path 63 for returning the cooling water used for heat exchange (steam cooling) in the condenser 40 to the water source, The two circulation pumps 60 and 61 are provided on a water intake passage 62.

  And since the circulation water system RL which concerns on this embodiment is provided with the two circulation pumps 60 and 61 as mentioned above, the said intake path 62 has two intakes for taking in cooling water from a water source. Primary intake passages 62a and 62b and secondary intake passages 62c joined to the condenser 40, and the primary intake passages 62a and 62b are joined to each other. Circulation pumps 60 and 61 are interposed. In this embodiment, the water source of the circulating water system RL is the sea. However, depending on the location conditions of the power generation facility 1, the river may be used as the water source of the circulating water system RL.

  Since the thermal power generation facility 1 is provided with two condensers 40, 40 in parallel as described above, the secondary intake channel 62c is provided with each condenser 40 to supply cooling water to each condenser 40. It is connected to the cooling pipe 401 of the condenser 40. That is, in the intake channel 62 of the circulating water system RL according to the present embodiment, the secondary intake channel 62c is configured by a single conduit, and both ends thereof are at the inlet ends of the cooling tubes 401 of the condensers 40. Each of the two primary intake passages 62a and 62b is fluidly connected to an intermediate position of the secondary intake passage 62c. Thereby, after the cooling water from each primary intake channel 62a, 62b merges in the secondary intake channel 62c, it is supplied to each condenser 40 (cooling pipe 401). On the other hand, the water discharge channel 63 is composed of two pipes, each of which is fluidly connected to the outlet end of the cooling pipe 401 of each condenser 40.

  The thermal power generation facility 1 drives a part of the circulation pump 60 when the electric water supply pump 50 is driven and the electric water supply pump 51 when the steam driven water supply pump 51 is driven. A larger number of circulating pumps 60 and 61 are driven than when 50 is driven. That is, the thermal power generation facility 1 according to the present embodiment is one unit in a state in which the electric feed water pump 50 is driven as in the start-up operation and the stop operation (the state in which the output of the generator 30 is in the low output range). Only the circulation pump 60 is driven to supply the cooling water to the condenser 40, but the steam-driven feed water pump 51 is driven (the output of the generator 30 is in a high output range including the rated output range). In a certain state), all the circulation pumps 60 and 61 are driven to supply cooling water to the condenser 40.

  The thermal power generation facility 1 according to the present embodiment is as described above. Next, an operation method of the thermal power generation facility 1 will be described with reference to FIG. In the following description, the rated output range of the generator 30 is set to 105 MW to 320 MW, the high output range is set to 75 MW to 320 MW, and the low output range is set to 10.5 MW to less than 75 MW. Accordingly, the case where the intermediate output range between the low output range and the rated output range is set to 75 MW or more and less than 105 MW will be described with emphasis on matters related to operation in the circulating water system RL. .

  First, the start-up operation for starting the operation of the thermal power generation facility 1 will be described. The thermal power generation facility 1 before activation is in a disconnected state with respect to the transmission line. In the thermal power generation facility 1, since the boiler 10 is stopped, no heat load is applied to the condenser 40. However, the steam generated in the boiler 10 is supplied to the condenser 40 via the steam system SL. The circulation pump 60 of the circulating water system RL is driven in advance so that the steam can be condensed when supplied to the tank. At this time, in the present embodiment, only one circulation pump 60 is driven, and the cooling water (seawater) is supplied into the cooling pipe 401 in the condenser 40 via the intake passage 62 and passes through the cooling pipe 401. The cooled water is returned to the water source (sea) through the water discharge channel 63.

  Then, the electric feed water pump 50 is driven in conjunction with driving the boiler 10, and steam generated in the boiler 10 is supplied to the condenser 40 via the steam system SL (bypass line SL5) to condensate the water. Increase the vacuum of the vessel 40. When the condenser 40 reaches a predetermined degree of vacuum, steam from the boiler 10 is supplied to the steam turbines 20, 21, 22, and 23 (high-pressure, intermediate-pressure, and low-pressure steam turbines 20, 21, 22, and 23). The generator 30 starts power generation by driving the steam turbines 20, 21, 22, and 23. When the output of the generator 30 reaches the lower limit value (10.5 MW) of the low output range, the thermal power generation facility 1 (generator 30) is brought into a parallel state in relation to the power transmission line, and the generator 30 generates power. Power will be transmitted.

  And although the output of the generator 30 becomes large gradually, in the state where the output of the generator 30 is a low output range (10.5 MW or more and less than 75 MW) lower than the rated output range, in the condensate / water supply system WL In the same manner as at the start of operation, the electric water supply pump 50 supplies water from the condenser 40 to the boiler 10, and one circulating pump 61 supplies cooling water to the condenser 40 in the circulating water system RL.

  And when the vacuum degree in the condenser 40 further increases with the cooling of the steam discharged from the steam turbines 20, 21, 22, and 23, the power generation amount of the generator 30 corresponds to the increase in the vacuum degree. The power generation amount (output of the generator 30) deviates from the low output range (10.5 MW or more and less than 75 MW), and the low output range (10.5 MW or more and less than 75 MW) and the rated output range (105 MW or more) The feed water pumps 50 and 51 for supplying water to the boiler 10 are electrically driven when a preset value (for example, 80 MW) is set in an intermediate output range between 75 MW and less (less than 105 MW). Switch to steam driven type. That is, when the output of the generator 30 reaches a set value (for example, 80 MW) in the lower limit region of the high output range (75 MW or more and 320 MW or less), the electric feed pump 50 stops and the steam drive feed pump 51 is driven. To do. And in the state which the output of the generator 30 exists in a high output area (75 MW or more and 320 MW or less), the steam drive type feed water pump 51 continues driving and supplies water to the boiler 10.

  In the thermal power generation facility 1 according to the present embodiment, the power supply pumps 50 and 51 are electrically driven as described above after the output of the power generator 30 is released from the low output range (10.5 MW or more and less than 75 MW). All the circulation pumps 60 and 61 are driven before switching from the steam-driven type to the steam-driven type. That is, in this embodiment, when the output value of the generator 30 reaches the lower limit value (75 MW) of the high output range (75 MW or more and 320 MW or less), all the circulation pumps 60 and 61 are driven prior to driving the steam-driven feed water pump 51. Is driven.

  Thereby, in the whole period when the steam drive type feed pump 51 is driven (when the steam drive type feed pump 51 is in a driving state), the number of units is larger than that when the electric feed pump 50 is driven. Since the circulation pumps 60 and 61 are driven, a necessary amount of cooling water corresponding to the heat load of the condenser 40 is supplied. That is, even if the output of the generator 30 reaches the rated output range (105 MW or more and 320 MW or less) and is in the output range (105 MW or more and 320 MW or less), the maximum amount required for the condenser 40 Cooling water can be supplied. Therefore, the steam can be reliably and appropriately cooled by the condenser 40 during rated operation at which the load on the generator 30 is maximized, and power can be generated satisfactorily without breaking the balance of the heat load on the condenser 40. it can.

  On the other hand, when performing the stop operation to stop the thermal power generation, first, the steam supply amount of the boiler 10 is decreased. Then, the output of the generator 30 decreases from the rated output range (105 MW or more to 320 MW or less) toward the lower range (low output range (10.5 MW or more and less than 75 MW)). And until the output of the generator 30 reaches the set value (for example, 80 MW) set in the intermediate output range (75 MW or more and less than 105 MW), the steam-driven feed water pump 51 in the boiler 10 in the condensate / water supply system WL Supply water. In this state, since the steam-driven feed water pump 51 is driven, in the circulating water system RL, the two circulating pumps 60 and 61 are driven to supply cooling water to the condenser 40.

  When the output of the generator 30 reaches the set value (80 MW) in the intermediate output range (75 MW or more and less than 105 MW), the feed pumps 50 and 51 for supplying water to the boiler 10 are switched from the steam-driven type to the electric type. In the circulating water system RL, the cooling water is continuously supplied to the condenser 40 by the two circulating pumps 60 and 61, and the output of the generator 30 is the lower limit value (75 MW) of the intermediate output range (75 MW or more and less than 105 MW). That is, when the lower limit value (75 M) of the high output range (75 MW or more and 320 MW or less) is reached, one circulating pump 60 is stopped and only the remaining one circulating pump 61 is driven.

  In this state, the output of the generator 30 is in a low output range (10.5 MW or more and less than 75 MW), and the thermal power generation facility 1 is in a parallel state in relation to the transmission line, but the process of stopping the operation Since the amount of steam supplied to the condenser 40 gradually decreases because of the process toward the disconnection, the necessary and sufficient cooling water is supplied to the condenser 40 even if water is supplied by one circulation pump 61. Is done.

  And if the output of the generator 30 departs from the low output range, after the thermal power generation facility 1 is disconnected from the transmission line, the steam turbines 20, 21, 22, 23 are stopped, and the condenser When the heat load of 40 is lost, the feed water pump 50 is stopped and the circulation pumps 60 and 61 are stopped.

  Thus, the thermal power generation facility 1 according to the present embodiment drives a part (one unit) of the circulation pump 60 while the electric feed water pump 50 is driven, and the steam driven feed water pump 51 drives. In this state, the remaining circulating pumps 61 are driven in addition to the part of the circulating pumps 60, so that the output of the generator 30 is in a low output range lower than the rated output range. Thus, wasteful consumption of energy for driving the circulating water system RL (energy for driving the circulating pumps 60 and 61) can be prevented, and the condenser 40 can be operated in an operating state where the output of the generator 30 is in the rated output range. Stable power generation can be prevented by preventing excessive heat load

  Therefore, according to the thermal power generation facility 1 according to the present embodiment, it is possible to suppress wasteful consumption of energy in the circulating water system RL in the start-up operation and the stop operation, and it is possible to perform stable power generation during the rated operation. The effects can be achieved.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  In the above embodiment, two circulating pumps 60 and 61 of the circulating water system RL are provided. However, the present invention is not limited to this. For example, three or more circulating pumps 60 and 61 may be provided. In this case, when the electric water supply pump 50 is driven or when the output of the generator 30 is in a low output range lower than the rated output range, a part (at least one) of the circulation pumps 60 is driven. When the steam-driven feed water pump 51 is driven, or when the output of the generator 30 is in a high output range higher than the low output range including the rated output range, In addition, another circulation pump 61 may be driven (the number of circulation pumps 60 and 61 to be driven is increased).

  In the above embodiment, the number of driven circulation pumps 60 and 61 of the circulating water system RL is changed in accordance with the operation state of the feed water pumps 50 and 51 of the condensate / water supply system WL. However, the present invention is not limited to this. For example, the number of circulating pumps 60 and 61 in the circulating water system RL may be changed based on the output value (power generation amount) of the generator 30. That is, when the output of the generator 30 is in a low output range lower than the rated output range, some circulating pumps 60 are driven, and the rated output range in which the output of the generator 30 is higher than the low output range is included. When the output is in the high output range, a larger number of circulation pumps 60 and 61 may be driven than in the low output range where the output of the generator 30 is lower than the rated output range.

  In this way, when the output of the generator 30 is in an output range lower than a predetermined rated output range as in the start-up operation and the stop operation, the minimum necessary circulation pumps 60 and 61 are driven to condensate. When the necessary minimum amount of cooling water corresponding to the heat load of the generator 40 is supplied and the output of the generator 30 is in a high output region higher than the low output region, many circulation pumps 60 and 61 are driven to recover. In order to supply the necessary cooling water to the heat load of the water device 40, energy for driving the circulating water system RL in the operation state where the output of the generator 30 is in a low output region lower than the rated output region (circulation pump 60, The energy that drives 61) can be prevented from being wasted, and in the state where the output of the generator 30 is in the rated output range, the heat load of the condenser 40 is prevented from becoming excessive and stable. It can generate electricity.

  In this case, as in the above-described embodiment, the high output range may be set to a range that combines the intermediate output range and the rated output range. However, the high output range is not restricted by the switching timing of the feed water pumps 50 and 51. The rated output range may be set as the high output range. Further, since it is not necessary to switch the number of circulating pumps 60 and 61 driven by the operation of the water supply pumps 50 and 51 of the condensate / water supply system WL, when providing a plurality of water supply pumps 50 and 51, both are electrically driven. It may be. However, it goes without saying that, in terms of suppressing energy consumption, it is preferable to use a combination of an electric type and a steam driven type in the feed water pumps 50 and 51 as in the above embodiment.

  In the above embodiment, when the output of the generator 30 is in the high output range, all the circulation pumps 60 and 61 are driven. For example, a plurality of circulation pumps are provided, and one or more of them are provided. Is preliminarily provided, it is not necessary to drive all the circulation pumps. That is, when the output of the generator 30 is in a high output range higher than the low output range including the rated output range, a larger number of circulation pumps are driven than in the case where the output of the generator 30 is in a low output range. do it.

  In the above embodiment, the rated output range of the generator 30 is 105 MW or more and 320 MW or less, the high output range is 75 MW or more and 320 MW or less, the low output range is 10.5 MW or more and less than 75 MW, and the intermediate output range is 75 MW or more and less than 105 MW. However, the present invention is not limited to this, and the rated output range, high output range, low output range, and intermediate output range are appropriately determined according to the design specifications of the thermal power generation facility 1. That's fine. However, in any output region, it is a premise that the output region corresponds to a state in which the power generated by the generator 30 is transmitted or can be transmitted (parallel state).

  DESCRIPTION OF SYMBOLS 1 ... Thermal power generation equipment, 10 ... Boiler, 11 ... Evaporator, 12 ... Superheater, 13 ... Reheater, 20 ... High pressure turbine (steam turbine), 21, 22 ... Medium pressure turbine (steam turbine), 23 ... Low pressure Turbine (steam turbine), 30 ... generator, 40 ... condenser, 50 ... electric feed pump (feed pump), 51 ... steam-driven feed pump (feed pump), 52 ... condensate pump, 53 ... low pressure feed water Heater (feed water heater), 54 ... deaerator, 55 ... high pressure feed water heater (feed water heater), 60, 61 ... circulating pump, 62 ... intake channel, 62a, 62b ... primary intake channel, 62c ... secondary Intake channel, 63 ... Discharge channel, 400 ... Housing, 401 ... Cooling pipe, B ... Valve, WL ... Condensate / water supply system, SL ... Steam system, RL ... Circulating water system, SL1 ... First steam pipeline, SL2 ... No. Second steam line, SL3 ... Beam pipe, SL4 ... the fourth steam pipe, SL5 ... fifth steam pipe, SL6 ... bypass line

Claims (4)

  A boiler that heats water into steam, a steam turbine that is driven by the steam generated by the boiler, a generator that generates electric power by driving the steam turbine, and cools steam discharged from the steam turbine The output of the generator is rated in a thermal power generation facility equipped with a condenser for making water and two or more circulation pumps that supply cooling water to the condenser to cool the steam with the condenser. When in a low output range lower than the output range, drive a part of the circulation pumps of two or more circulating pumps, and the generator output is a high output that includes a rated output range higher than the low output range. A thermal power generation facility configured to drive a greater number of circulation pumps when in the output range than when the output of the generator is in a low output range.   A boiler that heats water into steam, a steam turbine that is driven by the steam generated by the boiler, a generator that generates electric power by driving the steam turbine, and cools steam discharged from the steam turbine Condenser to make water, two or more water supply pumps that supply the boiler with water obtained from the condenser, and supply cooling water to the condenser to cool the steam with the condenser Steam that includes two or more circulation pumps and that is configured by an electric water pump that is electrically driven by a part of the two or more water pumps, and the remaining water pump is driven by steam from a boiler It is composed of a driven feed pump, and when the generator output is in a low output range lower than the rated output range, the electric feed pump is driven, and the generator output is between the low output range and the rated output range. When it is over the set value within the output range of In a thermal power generation facility configured to drive a driven feedwater pump, when the electric feedwater pump is being driven, a part of the two or more circulation pumps is driven, and a steam driven type A thermal power generation facility configured to drive a larger number of circulation pumps when the water supply pump is being driven than when the electric water supply pump is being driven.   A boiler that heats water into steam, a steam turbine that is driven by the steam generated by the boiler, a generator that generates electric power by driving the steam turbine, and cools steam discharged from the steam turbine In a method of operating a thermal power generation facility comprising a condenser for making water and two or more circulation pumps for supplying cooling water to the condenser to cool the steam in the condenser, When the output is in a low output range lower than the rated output range, some circulating pumps of two or more circulating pumps are driven, and the generator output has a rated output range higher than the low output range. A method for operating a thermal power generation facility, characterized in that, when in a comprehensive high power range, a greater number of circulation pumps are driven than when the generator output is in a low power range.   A boiler that heats water into steam, a steam turbine that is driven by the steam generated by the boiler, a generator that generates electric power by driving the steam turbine, and cools steam discharged from the steam turbine Condenser to make water, two or more water supply pumps that supply the boiler with water obtained from the condenser, and supply cooling water to the condenser to cool the steam with the condenser Steam that includes two or more circulation pumps and that is configured by an electric water pump that is electrically driven by a part of the two or more water pumps, and the remaining water pump is driven by steam from a boiler It is composed of a driven feed pump, and when the generator output is in a low output range lower than the rated output range, the electric feed pump is driven, and the generator output is between the low output range and the rated output range. When it is over the set value within the output range of In the operation method of the thermal power generation facility configured to drive the drive type water supply pump, when the electric type water supply pump is driven, a part of the two or more circulation pumps is driven, A method for operating a thermal power generation facility, characterized in that when a steam-driven feed water pump is being driven, a greater number of circulation pumps are driven than when an electric feed water pump is being driven.

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