JP2010024871A - Generator output limit management method using intake-drain water temperature difference in condenser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce the maximum output of a generator to be operated in an agreement value while reducing the burden of an operator, by focusing attention on a correlation between an intake-drain water temperature difference between sea water taken to be supplied to a condenser in a power generation plant and sea water to be drained after heat exchange, and the output of the generator to prevent the excess of the agreement value due to a human error. <P>SOLUTION: In order that an average daily value for an intake-drain water temperature difference is lower than 7°C and an instantaneous value is lower than 10°C, the output of the generator 1 is set to be higher than current one when the intake-drain water temperature difference is lower than 7°C and the temperature difference when measured tends to be lower than when previously measured, and it is kept in status quo when the temperature difference does not tend to be lower. On the contrary, the output of the generator 1 is set to be lower than current one when the intake-drain water temperature difference is not lower than 7°C and the temperature difference when measured tends to be higher than when previously measured, and it is kept in status quo when the temperature difference does not tend to be higher. Thus, determination is made in each case to select set output. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to temperature management technology for intake and drainage of seawater and the like used in a condenser at a power plant, and in particular, power generation by the temperature difference of intake and discharge in a condenser that limits and controls the output of a generator due to the difference in intake and discharge temperature. It is related with the management method of the output restriction of a machine.

  Steam used in the turbine at the power plant is converted to condensate by a condenser. When cooling this condenser, seawater, river water, etc. are used. Seawater used for this cooling is taken from the intake and supplied to the condenser by a circulation pump. This seawater is heat-exchanged by a condenser and discharged from a drain outlet to a public water area such as a sea area. There is a temperature difference between the temperature when the water is taken from the water intake and the temperature when the water is discharged from the drain, and this is called the temperature difference of the drainage.

  Thus, when operating a power plant, a large amount of seawater is taken and drained after being used. Drainage discharged into public water bodies can adversely affect marine life due to rising water temperatures. For this reason, there is a restriction on the temperature difference between the intake and drainage for the protection of marine organisms. For example, power plants have agreements with local governments so that the daily temperature difference is 7 ° C or less on average and 10 ° C or less on an instantaneous value.

  For example, in summer, the cooling capacity of the condenser tends to decrease due to the rise in seawater temperature and the influence of algae and shellfish in the seawater. Since the saturation temperature of the condensate rises, the seawater temperature after depriving of the heat also rises, and the temperature difference between intake and drainage rises. For this reason, when operating at the maximum load, it is difficult to maintain the agreed value. At this time, the operator adjusted the output of the generator based on the temperature difference between the intake and drainage of the environmental monitoring device.

  In the conventional environmental monitoring device, the operator can confirm the cumulative average of the temperature difference of intake and drainage dates back to 0:00 from the present time. Also, the predicted average temperature difference up to 24:00 when the output at that time is continued can be confirmed. However, the environmental monitoring device has no function to calculate the generator output that can be generated within a range that falls within the agreed value. Therefore, the operator has adjusted the output so that it is within the agreed value based on the temperature difference between intake and drainage and the output of the generator. Since it is based on the operator's personal judgment, there is a risk of exceeding the agreed value due to the human error. For this reason, there is a problem that an excessive operation burden is imposed on the operator.

Incidentally, various technologies for reducing the discharge amount of hot waste water and increasing the electrical output of the power plant have been proposed. For example, as disclosed in Japanese Patent Application Laid-Open No. 2001-194488 “Condenser Cooling Device for Power Plant”, a condenser having a water intake opening to a river or the ocean and supplied with steam discharged from a turbine. A water intake passage communicated with a heat transfer pipe provided in the water device, a pump installed in the water intake passage and supplying cooling water taken from the water intake through the water intake passage to the heat transfer pipe, and the heat transfer pipe A drainage passage that opens to a river or ocean, a return passage that communicates with the drainage passage and communicates with the intake passage between the intake port and the pump, and is provided in the return passage. There has been proposed a condenser cooling device for a power plant equipped with a cooling device.
JP 2001-194488 A

  On the other hand, there is a tendency to lower the set value of the output of the generator so that the temperature difference between intake and drainage does not exceed the agreed value. However, this has a problem that the output of the generator cannot be utilized to the maximum extent.

  The present invention has been developed to solve such problems. That is, the object of the present invention is to pay attention to the correlation between intake / drain temperature difference and generator output, and to calculate the output from the intake / drain temperature difference, thereby preventing the agreement value from being exceeded due to human error and The output of the generator can be managed smoothly and easily so that the maximum generator output that can be operated within the agreed value is reduced. It is to provide a method.

  According to the present invention, when operating the power plant, the difference in intake and discharge temperature between the seawater taken to supply the condenser and the seawater drained after heat exchange is 7 ° C. or less in daily average value, A method for managing the output limit of a generator due to a temperature difference between intake and drainage in a condenser, wherein the output of the generator (1) is limited so that the instantaneous value is 10 ° C. or less, and the intake and discharge temperature in the power plant Stores various information related to the difference, average intake / discharge temperature difference, cumulative average intake / discharge temperature difference and generator output, and information on the intake / discharge temperature difference of the condenser and the output of the generator (1) The data of the generator (1) that always collects the data of the information and can comply with the limit value of the temperature difference of the intake and discharge water based on the stored data according to the collected temperature difference and the change of the output of the generator (1) Regarding the set output, the difference in intake and discharge temperature is When the temperature difference during the measurement tends to be lower than in the previous measurement, the output of the generator (1) is set higher than the current value, and when it does not tend to be lower, the current value is maintained. Conversely, when the temperature difference between intake and drainage is 7 ° C. or more and the temperature difference at the time of measurement tends to be higher than at the time of the previous measurement, the output of the generator (1) is set lower than the current value and higher. When the current situation is not maintained, a method for managing the output limit of the generator due to the temperature difference of the intake and drainage in the condenser is provided.

  For example, when determining the set output of the generator (1) that can comply with the limit value of the intake / drain temperature difference, the cumulative average intake / discharge temperature difference is calculated by the following equation (1).

When determining the set output of the generator (1) capable of complying with the limit value of the temperature difference between intake and drainage, when operating the generator (1), it was collected within the previous day, the second day, the third day Use data on intake / drain temperature difference and generator (1) output.
Further, when determining the set output of the generator (1) capable of complying with the limit value of the temperature difference between intake and drainage, when the generator (1) is stopped, the generator (1) is operated. The data on the temperature difference between the intake and drainage and the output of the generator (1) collected during the last day driving were used.

  In the invention of the above configuration, water intake temperature such as seawater and drainage temperature in the power plant are collected, the data regarding the temperature difference of intake and discharge, the difference in average intake and discharge temperature, the cumulative average intake and discharge temperature difference and the output of the generator (1). Based on the above, the optimum output of the generator (1) is determined according to the change in the temperature difference between the intake and drainage, and the output of the generator (1) is automatically set. Therefore, the output of the generator (1) can be set accurately and can be operated at the maximum generator output that can be operated within the agreed value.

  Further, the agreed value can be observed by controlling the upper limit control of the generator (1) output setting device so as not to set the output of the generator (1) or more. Therefore, it is possible to prevent the agreement value from being exceeded due to human error by the operator, and to reduce the burden on the operator.

  The method of managing the output limit of the generator due to the temperature difference between the intake and drainage of the condenser according to the present invention is to drain water after exchanging heat with the seawater taken to supply the condenser when operating the power plant. In this method, the output limit of the generator is managed so that the temperature difference between intake and drainage with seawater is 7 ° C. or less for the daily average value and 10 ° C. or less for the instantaneous value.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a system diagram showing a management method of output limit of a generator due to a temperature difference of intake water in the condenser of the present invention.
A power plant that implements the power output limit management method of the present invention basically comprises a power generator 1 and a turbine 2 that rotates the power generator 1. The steam used in the turbine 2 is converted into condensate by a condenser (not shown). When this condenser is cooled, the seawater is taken from the inlet, supplied to the condenser by a circulation pump, and the heat-exchanged seawater that has risen in temperature is discharged from the outlet to a public water area such as the sea area. . The environment monitoring device 3 monitors the temperature when the water is taken from the water intake and the temperature when the water is discharged from the water outlet. In addition, it is not limited to seawater, River water, lake water, etc. can also be utilized.

  In the generator output limit management method according to the present invention, the environmental monitoring device 3, the plant data management system 4, and the plant automatic control device (APC) 5 are used to generate power according to changes in the intake and discharge temperature difference. The optimum output of the machine 1 is determined, and the output of the generator 1 is automatically set. The environmental monitoring device 3 collects various data relating to the current intake / drain temperature difference, the average intake / exhaust temperature difference, and the cumulative average intake / discharge temperature difference for the intake / drain temperature difference. The plant data management system 4 calculates the optimum output of the generator 1 mainly from the correlation between the intake / drain temperature difference and the generator output. For example, a module that connects representative points with a linear curve is created. The plant automatic control device (APC) 5 can comply with the above-described limit value of the intake / drain temperature difference based on the data stored in the plant data management system 4 according to the collected temperature difference and the output of the generator 1. The setting output of the generator 1 is determined. It is determined that the output of the generator 1 is set to be higher or lower than the current level or to maintain the current level according to the situation of this intake / drain temperature difference, and the setting output is switched.

FIG. 2 is a block diagram of a plant data management system for implementing the generator output limit management method of the present invention.
The plant data management system 4 for carrying out the generator output limit management method of the present invention includes an arithmetic processing unit 11, a database 12, an input unit 13, an input processing unit 14, a determination processing unit 15, an output processing unit 16, and the like. It is comprised from. The database 12 is related to the intake water temperature data 17 relating to the temperature (water temperature) of seawater when the water is taken from the intake port, the drainage temperature data 18 relating to the temperature (water temperature) when the water is discharged from the drain port, and the difference between the intake temperature and the drainage temperature. It consists of intake / drain temperature difference data 19 and data such as generator output data 20 relating to the set output of the generator 1.

  The arithmetic processing device 11 executes various arithmetic processing based on various data collected by the environment monitoring device 3 input from the input device 13 and other conditions manually input. Section 14, intake water temperature data 17, drainage temperature data 18, determination processing unit 15 determined based on intake water temperature difference data 19 and generator output data 20, and as a result of the determination, the optimum output setting of the generator 1 An output processing unit 16 that outputs to the above-described plant automatic control device (APC) 5 and performs control processing for switching the output setting of the generator 1 is provided.

FIG. 3 is a flowchart of a method for managing the output limit of the generator of the present invention.
An example of processing by the generator output restriction management method of the present invention will be described.
In accordance with the collected temperature difference and the change in the output of the generator 1, the set output of the generator 1 that can comply with the limit value of the intake and discharge temperature difference based on the data stored in the database 12 is 7 ° C. When it is determined that the temperature difference during the measurement tends to be lower than that during the previous measurement, the output of the generator 1 is switched to a setting higher than the current value. This switches the output of the generator 1 to a higher setting than the present when the seawater temperature falls and the cooling capacity of the condenser is not affected as in winter.
Moreover, when it determines with it not tending to become low, the output of the generator 1 is made to maintain the present condition, and a setting is not switched.

On the contrary, in the summer, the cooling capacity of the condenser decreases due to the rise of seawater temperature and the growth of algae and shellfish in the seawater, and the saturation temperature of the condensate rises. Rises and the temperature difference between intake and drainage rises. Therefore, when it is determined that the temperature difference between intake and drainage is 7 ° C. or more and the temperature difference at the time of measurement tends to be higher than at the time of previous measurement, the output of the generator 1 is switched to a setting lower than the current value.
Further, when it is determined that there is no tendency to increase, the output of the generator 1 is maintained as it is, and the setting is not switched.

  However, since the temperature difference between intake and discharge is affected by the intake temperature and the reduction of the heat transfer area of the cooler due to adhesion of algae and shellfish in addition to the output of the generator 1, it is necessary to eliminate the uncertain factors as much as possible. . Therefore, the cumulative average intake / drain temperature difference is transmitted from the environment monitoring device 3 in real time, the following calculation is performed, and the set output of the generator 1 within a possible range is determined from the intake / drain temperature difference. The cumulative average intake and drainage temperature difference at this time is calculated by the following equation [Equation 1].

  When calculating with the above formula, the following data is used. When determining the set output of the generator 1 that can comply with the limit value of the intake / drain temperature difference, when operating the generator 1, the difference in intake / exhaust temperature and power generation collected within 2 days, 3 days Data relating to the output of the machine 1 is used.

  In addition, when the generator 1 is stopped, data on the intake / drain temperature difference and the output of the generator 1 collected when the generator 1 was operating on the last day are used.

  Note that the present invention pays attention to the correlation between the intake / drain temperature difference and the output of the generator 1 and calculates the output from the intake / discharge temperature difference, thereby preventing the agreement value from being exceeded due to human error and the burden on the operator. As long as the output of the generator can be managed smoothly and easily so that the maximum output of the generator 1 that can be operated within the agreed value can be output, the present invention is not limited to the embodiment described above. Of course, various changes can be made without departing from the scope of the present invention.

  The method of managing the output limit of the generator due to the temperature difference between the intake and drainage in the condenser of the present invention is also used for temperature management in plant facilities that take seawater and river water in addition to the power plant and use it for heat exchange. Can be used.

It is a systematic diagram which shows the management method of the output restriction | limiting of a generator by the temperature difference of the intake water in the condenser of this invention. It is a block diagram of the plant data management system which enforces the output restriction management method of the generator of the present invention. 4 is a flowchart of a method for managing output limits of a generator of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Generator 2 Turbine 3 Environmental monitoring apparatus 4 Plant data management system 5 Plant automatic control apparatus (APC)
DESCRIPTION OF SYMBOLS 11 Arithmetic processor 12 Database 13 Input device 14 Input processing part 15 Judgment processing part 16 Output processing part 17 Intake temperature data 18 Drain temperature data 19 Intake temperature difference data 20 Generator output data

Claims (4)

When operating the power plant, the difference in intake and discharge temperatures between the seawater taken to supply the condenser and the seawater drained after heat exchange is 7 ° C or less for the daily average, and 10 ° C or less for the instantaneous value. A method for managing the output limit of the generator by limiting the output of the generator (1) so that
Stores various information regarding intake and discharge temperature difference in the power plant, average intake and discharge temperature difference, cumulative average intake and discharge temperature difference and generator output,
Always collect information data on the intake and drain temperature difference of the condenser and information on the output of the generator (1),
According to the collected temperature difference and the change in the output of the generator (1), the set output of the generator (1) that can comply with the limit value of the intake water temperature difference based on the stored data,
When the temperature difference between intake and drainage is 7 ° C or less and the temperature difference at the time of measurement tends to be lower than at the time of the previous measurement, the output of the generator (1) is set higher than the current value and does not tend to be lower. Sometimes keep the status quo,
Conversely, when the temperature difference between intake and drainage is 7 ° C. or more and the temperature difference at the time of measurement tends to be higher than at the time of the previous measurement, the output of the generator (1) is set lower than the current value and higher. When it is not the tendency to become, the management method of the output limitation of the generator by the temperature difference of the intake / drainage in the condenser characterized by determining each and switching to the set output when the current state is maintained. When determining the set output of the generator (1) capable of complying with the limit value of the intake water temperature difference, the cumulative average intake water temperature difference is calculated by the following formula [Equation 1]. The management method of the output limit of the generator by the temperature difference of the intake water in the condenser of Claim 1.

  When determining the set output of the generator (1) capable of complying with the limit value of the temperature difference between intake and drainage, when operating the generator (1), it was collected within the previous day, the second day, the third day 3. The method for managing the output limit of a generator due to a temperature difference between intake and drainage in a condenser according to claim 1 or 2, wherein data relating to the difference in intake and drainage temperature and the output of the generator (1) is used.   When determining the set output of the generator (1) capable of complying with the limit value of the intake / drain temperature difference, when the generator (1) was stopped, the generator (1) was operated. 3. The generator according to the temperature difference of the intake / drainage in the condenser according to claim 1, wherein the data regarding the difference in intake / exhaust temperature collected during operation on the last day and the output of the generator (1) are used. To manage the output limit of the system.

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