JP2012122364A - Method of managing auxiliary power ratio of conventional thermal power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of managing an auxiliary power ratio of a conventional thermal power plant capable of properly evaluating the auxiliary power ratio and capable of early finding abnormality of an auxiliary machine.SOLUTION: A boiler-side in-plant power amount reference expression is prepared in advance, for obtaining a reference boiler-side in-plant power amount based on, as a parameter, a process amount having relation with a boiler-side in-plant power amount out of the in-plant power amount of a conventional thermal power plant. A turbine-side in-plant power amount reference expression is prepared in advance, for obtaining a reference turbine-side in-plant power amount based on, as a parameter, a process amount having relation with turbine-side in-plant power amount out of the in-plant power amount. The reference auxiliary power ratio is obtained by dividing the reference in-plant power amount being the sum of the reference boiler-side in-plant power amount obtained on the basis of the boiler-side in-plant power amount reference expression and the reference turbine-side in-plant power amount obtained on the basis of the turbine-side in-plant power amount reference expression by the power generation amount. The difference between the auxiliary power ratio obtained by dividing the in-plant power amount by the power generation amount and the reference auxiliary power ratio is obtained as an auxiliary power ratio difference, and the auxiliary power ratio difference is evaluated to manage the auxiliary power ratio.

Description

  The present invention relates to an in-house rate management method for a conventional thermal power plant that manages the in-house rate obtained by dividing the in-house power amount of a conventional thermal power plant by the generated power amount.

  In general, a conventional thermal power plant conducts power generation by directing steam generated in a boiler to a turbine and driving a generator connected to the turbine. Various types of auxiliary equipment are provided in the boiler system and the turbine system. There are many auxiliaries driven by electric power. For example, the boiler system of a conventional thermal power plant includes auxiliary machines such as a forced draft fan FDF that sends air to the boiler, an induction fan IDF that sends the exhaust gas from the boiler to a flue gas treatment device, and a booster vent BUF that boosts the exhaust gas. In addition, the turbine system includes a circulating water pump CWP that circulates seawater to the condenser, a condensate pump CP that supplies water from the condenser to the feed water pump, a condensate booster pump CBP that boosts the condensate, etc. There are auxiliary machines, and these auxiliary machines are driven by electric power.

  The electric power supplied to such an auxiliary machine is the amount of electric power required for the in-house power, and it is desirable for the conventional thermal power plant to reduce the in-house power (for example, see Patent Document 1 and Patent Document 2). Therefore, the on-site rate is managed by dividing the on-site power amount by the generated power amount of the generator to obtain the on-site rate.

JP 2000-248907 A JP 2005-155372 A

  However, until now, the management method related to the on-site rate of conventional thermal power plants has not been clarified, and the on-site rate cannot be evaluated. FIG. 19 is a transition graph of the in-site ratio of Unit 1 of a coal-fired power plant. In the in-house rate A1 calculated by the in-site electric energy including the common portion (for operational coal facilities), the fluctuation is not in a very manageable situation. Further, even with the in-house rate A2 calculated with the in-house electric energy not including the common portion, the situation is not yet manageable.

  In other words, the in-house electric energy for about 4 months was measured and the in-house ratios A1 and A2 were obtained. However, the fluctuation is large and whether the power is when the boiler system and turbine system auxiliary equipment are operating normally. Difficult to judge. Thus, it is in the situation where an in-house ratio cannot be evaluated, and management of auxiliary machinery power of a boiler system and a turbine system cannot be performed.

  An object of the present invention is to provide a method for managing the indoor area ratio of a conventional thermal power plant that can appropriately evaluate the indoor area ratio and detect abnormalities in auxiliary equipment at an early stage.

  An in-house rate management method for a conventional thermal power plant according to claim 1 is the in-house power amount of a conventional thermal power plant that generates electricity by driving steam generated in a boiler to a turbine and driving a generator connected to the turbine. In the in-house rate management method of the conventional thermal power plant that manages the in-house rate obtained by dividing the generated power by the generated power amount, the process amount related to the boiler-side in-house power amount of the in-house power amount is used as a parameter. The boiler side in-house electric energy reference formula for obtaining the reference boiler side in-house electric energy is prepared in advance, and the reference turbine side using the process amount related to the turbine-side in-house electric energy of the in-house electric energy as a parameter A turbine side in-house electric energy reference formula for determining the in-house electric energy is created in advance, and the process is related to the boiler-side in-house electric energy. And the reference side in the turbine side determined by the turbine side in-house power amount reference formula based on the reference boiler side in-site power amount determined by the boiler side in-site power amount reference formula and the process amount related to the turbine side in-site power amount. The standard in-house power amount, which is the sum of the power amount, is divided by the generated power amount to obtain a reference in-house rate, and the in-house rate obtained by dividing the in-house power amount by the generated power amount and the reference in-house rate A deviation is obtained as an internal ratio deviation, the internal ratio deviation is evaluated, and the internal ratio is managed.

  According to a second aspect of the present invention, there is provided a conventional thermal power plant in-house rate management method according to the first aspect of the invention, wherein the reference boiler-side in-house electric energy obtained by the boiler-side in-house electric energy standard equation is divided by the generated electric energy. The boiler-side ratio is determined by dividing the boiler-side power amount by the generated power amount to obtain the boiler-side ratio, and the deviation between the reference-boiler-side ratio and the boiler-side ratio is calculated in the boiler-side ratio. It is obtained as a rate deviation, and the reference turbine side in-house power amount obtained by the turbine side in-house power amount reference equation is divided by the generated power amount to obtain a reference turbine side in-house rate, and the boiler side in-house power amount is calculated as the generated power amount. The boiler side internal rate is obtained by dividing by the following formula, and the deviation between the reference turbine side internal rate and the turbine side internal rate is obtained as a turbine side internal rate deviation, and in addition to the internal rate deviation, the boiler side internal rate Evaluates the difference and the turbine-side house rate deviation, characterized in that it manages the boiler side plant rate and the turbine-side house rate in addition to the plant factor.

  The on-site rate management method for a conventional thermal power plant according to claim 3 is the method according to claim 1 or 2, wherein the in-site electric energy is measured by an watt-hour meter, and the boiler-side in-house electric energy is measured at each boiler side. The shaft power of the auxiliary machine is calculated and the shaft power is summed up, and the turbine side in-house power amount is obtained by subtracting the boiler side in-house power amount from the in-house power amount.

  According to a fourth aspect of the present invention, there is provided an in-house rate management method for a conventional thermal power plant according to any one of the first to third aspects, wherein the process amount and the turbine are related to the boiler-side in-house electric energy. The process quantity related to the electric power in the side station is characterized by the exhaust gas flow rate discharged from the conventional thermal power plant.

  According to a fifth aspect of the present invention, there is provided a conventional thermal power plant site ratio management method according to the first or second aspect of the invention, wherein the in-house power amount is measured by a watt-hour meter, and the boiler-side in-house power amount is Based on the current of the boiler side auxiliaries, the amount of electric power used by each boiler side auxiliaries is calculated, and the amount of electric power consumed by these boiler side auxiliaries is summed up. The power consumption of each turbine side auxiliary machine is calculated based on the current of the turbine side, and the power consumption of these turbine side auxiliary machines is summed up to obtain the boiler side local power quantity and the turbine side local power quantity from the local power quantity. It is characterized by subtracting the amount and obtaining other in-house electric energy.

  According to the first aspect of the present invention, the in-site electric energy is divided into the boiler-side in-house electric energy and the turbine-side in-house electric energy, and the boiler-side in-room electric energy reference formula using the relevant process amount as a parameter. Since the turbine side in-house electric energy standard formula is prepared in advance, the deviation between the standard in-house rate calculated by these standard formulas and the actual in-house rate is obtained as the in-house rate deviation, and this in-place rate deviation is evaluated. You can manage the rate.

  According to the invention of claim 2, since the boiler side internal rate deviation and the turbine side internal rate deviation are evaluated in addition to the internal rate deviation, the boiler side internal rate and the turbine side internal rate can be managed in addition to the internal rate.

  According to the invention of claim 3, the boiler side in-site electric energy is obtained by calculating the shaft power of each auxiliary machine on the boiler side, and summing up these shaft powers. Since the in-house electric energy is subtracted and obtained, the boiler-side in-house electric energy and the turbine-side in-house electric energy can be obtained without providing a new watt-hour meter for each auxiliary machine.

  According to the fourth aspect of the present invention, the exhaust gas flow rate having a strong correlation with the boiler-side in-house electric energy and the turbine-side in-house electric energy is set as the process amount related to the boiler-side in-house electric energy and the turbine-side in-house electric energy. In addition, the reference boiler side in-house electric energy and the reference turbine side in-house electric energy can be easily obtained by the exhaust gas flow rate.

  According to the fifth aspect of the present invention, the boiler-side power amount and the turbine-side power amount are calculated based on the currents of the respective auxiliary machines, and are obtained and summed up. Even when the process amount for calculating the power cannot be obtained, the boiler-side local power amount and the turbine-side local power amount can be obtained.

The flowchart which shows an example of the indoor ratio management method of the conventional thermal power plant which concerns on embodiment of this invention. The graph which shows an example of the data of the predetermined period of the electric energy Pb in the boiler side of a boiler system | strain, and the waste gas quantity Q1. The graph which calculated | required the boiler side in-house electric energy Pb on the coordinate system which made the vertical axis | shaft the boiler side in-house electric energy Pb, and the horizontal axis | shaft the exhaust gas flow rate Q1, and calculated | required the boiler side in-house electric energy standard formula Yb. A graph in which the turbine side in-site power amount Pt is plotted in a coordinate system in which the vertical axis represents the turbine side in-site power amount Pt and the horizontal axis represents the exhaust gas flow rate Q1 to obtain the turbine side in-house power amount reference formula Yt. A graph in which the vertical axis indicates the internal ratio A and the internal ratio deviation ΔA, and the horizontal axis indicates the operation time. The flowchart which shows another example of the indoor ratio management method of the conventional thermal power plant which concerns on embodiment of this invention. A graph when the vertical axis represents the boiler side internal rate deviation ΔAb and the turbine side internal rate deviation ΔAt, and the horizontal axis represents the operation time. The graph which calculated | required the boiler side in-site electric energy Pb on the coordinate system which made the vertical axis | shaft the boiler side in-house electric energy Pb, and the horizontal axis the total air flow rate Q2, and calculated | required the boiler side in-house electric energy standard formula Yb. A graph in which the turbine side in-site power amount Pt is plotted in a coordinate system in which the vertical axis represents the turbine side in-site power amount Pt and the horizontal axis represents the seawater temperature T1, and the turbine side in-house power amount reference expression Yt is obtained. The graph which plotted other in-house electric energy Pz on the coordinate system which made the vertical axis the other in-room electric energy Pz, and the horizontal axis | shaft the atmospheric temperature T2, and calculated | required the other in-house electric energy standard formula Yz. A graph when the in-house power amount P is calculated based on the current, and the in-axis rate A and in-site rate deviation ΔA are taken on the vertical axis and the operation time is taken on the horizontal axis. The graph when the in-house electric energy P is calculated based on the current, and the operation rate is taken on the horizontal axis with the internal rate A and the boiler internal rate deviation ΔAb on the vertical axis. The graph when the in-house electric energy P is calculated based on the current, and the operation rate is taken on the horizontal axis with the internal rate A and the turbine internal rate deviation ΔAt on the vertical axis. A graph when the in-house power amount P is calculated based on the current, and the in-axis rate A and other in-site rate deviation ΔAz are taken on the vertical axis and the operation time is taken on the horizontal axis. The graph which plotted the boiler side site electric energy Pb on the coordinate system which made the vertical axis | shaft the electric energy Pb in the boiler side, and made the horizontal axis the FDF total suction flow rate. The graph which plotted the turbine side site electric energy Pt on the coordinate system which made the vertical axis the turbine side site electric energy Pt, and the horizontal axis made the condenser vacuum degree. A graph when the in-house power amount P is calculated based on a small amount of operation data, and the in-axis rate A and in-site rate deviation ΔA are taken on the vertical axis and the operation time is taken on the horizontal axis. A graph when the in-house electric energy P is calculated on the basis of a small amount of operation data, where the vertical axis indicates the boiler side internal rate deviation ΔAb and the turbine side internal rate deviation ΔAt, and the horizontal axis indicates the operation time. Transition graph of the in-house ratio of Unit 1 of a coal-fired power plant.

  Embodiments of the present invention will be described below. The basic concept of the embodiment of the present invention will be described. Since the fluctuation in the in-house ratio in FIG. 19 is large, the in-house electric energy is obtained by dividing it into the boiler-side in-house electric energy and the turbine-side in-house electric energy, and the fluctuation in the in-house electric energy depends on the auxiliary power of either the turbine system or the boiler system. The data was confirmed by taking a long span. As a result, it was found that the auxiliary power of the turbine system hardly fluctuated throughout the year, and the auxiliary equipment (ventilator) on the boiler side caused the power fluctuation.

  Next, it was found that there is a relation with the amount of exhaust gas discharged from a conventional thermal power plant, when various data were used to compare what caused the amount of power in the boiler system. FIG. 2 is a graph of data for about one year and three months of the amount of electric power Pb in the boiler side of the boiler system and the amount of exhaust gas Q1. As shown in FIG. 2, the boiler side local power amount Pb and the exhaust gas amount Q1 have substantially the same characteristics. When the boiler side local power amount Pb increases, the exhaust gas amount Q1 also increases with the same characteristics, and the boiler When the in-site power amount Pb decreases, the exhaust gas amount Q1 also decreases with substantially the same characteristics.

  Therefore, a standard for the shaft power of each ventilator (auxiliary machine) in the boiler system is created, and using the shaft power standard, a standard expression for the auxiliary machine shaft power standard for the boiler system and the turbine system is calculated. We decided to manage the in-house ratio by calculating the deviation between the standard in-house ratio and the actual in-house ratio, and evaluating the in-site ratio deviation.

  FIG. 1 is a flowchart showing an example of an indoor rate management method for a conventional thermal power plant according to an embodiment of the present invention. First, a boiler-side in-house power amount reference formula for obtaining a reference boiler-side in-house power amount Pbr using a process amount related to the boiler-side in-house power amount Pb in the in-house power amount P as a parameter is created in advance (S1). ).

  The boiler-side in-site electric energy Pb is obtained, for example, by calculating the shaft power Ls of each auxiliary machine on the boiler side and adding up these shaft powers. The shaft power Ls of the auxiliary machine can be obtained by equation (1) where Lad is the theoretical air power and η is the efficiency.

Ls = (Lad / η) · 100 (1)
Further, the theoretical aerodynamic power Lad is obtained by the equation (2) where Qs is the flow rate, k is the specific heat ratio, P1 is the inlet pressure, and P2 is the outlet pressure.

Lad = (Qs / 60) · {k / (k + 1)} · P1 · (1/10) · {(P2 / P1) ^{(k + 1) / k)} } (2)
For each auxiliary machine of the boiler, for example, forced draft fan FDF, primary ventilator PAF, induction ventilator IDF, booster ventilator BUF, etc., the flow rate Qs, inlet pressure P1, outlet pressure P2 are set for a certain period (6 months to 1 year). The exhaust gas flow rate Q1 at that time is also collected. Then, based on the collected flow rate Qs, inlet pressure P1, and outlet pressure P2, the theoretical aerodynamic power Lad is calculated by equation (2), and the shaft power Ls of the auxiliary machine is calculated by equation (1).

  Next, the shaft power Ls of each auxiliary machine is summed to obtain the boiler side in-site electric energy Pb. As shown in FIG. 3, the vertical axis is the boiler side in-house electric energy Pb, and the horizontal axis is the exhaust gas flow rate Q1. A graph is generated by plotting the boiler side power amount Pb in the coordinate system. From this graph, the boiler-side local power amount reference formula Yb of the boiler-side local power amount Pb using the exhaust gas flow rate Q1 as a parameter is obtained.

  In this way, the boiler-side in-house power amount reference formula Yb of the boiler-side in-house power amount Pb using the process amount (exhaust gas flow rate Q1) related to the boiler-side in-house power amount Pb as a parameter is obtained in advance. The boiler side in-site electric energy reference formula Yb is used when obtaining the reference boiler-side in-house electric energy Pbr from the measured exhaust gas flow rate Q1.

  Similarly, a turbine-side in-house power amount reference expression for obtaining a reference turbine-side in-house power amount Ptr using a process amount related to the turbine-side in-house power amount Pt of the in-site power amount P as a parameter is created in advance ( S2). The turbine-side in-house electric energy Pt is obtained by subtracting the boiler-side in-house electric energy Pb from the in-house electric energy P. The in-house power amount P is obtained by measuring the power of the in-house bus with a watt hour meter.

  As shown in FIG. 4, a graph is created by plotting the turbine-side in-house power Pt in a coordinate system with the vertical axis representing the turbine-side in-house power Pt and the horizontal axis representing the exhaust gas flow rate Q1. Then, from this graph, a turbine-side local power amount reference expression Yt for the turbine-side local power amount Pt with the exhaust gas flow rate Q1 as a parameter is obtained.

  In this way, the turbine-side local power amount reference formula Yt for the turbine-side local power amount Pt having the process amount (exhaust gas flow rate Q1) related to the turbine-side local power amount Pt as a parameter is obtained in advance. The turbine-side local power amount reference formula Yb is used when obtaining the reference turbine-side local power amount Ptr from the measured exhaust gas flow rate Q1.

  Next, in evaluating the actual in-house rate, first, the reference in-site rate Ar is obtained from the measured exhaust gas flow rate Q1 (S3). As shown in the following equation (3), the reference in-house rate Ar is obtained by dividing the reference in-house electric energy Pr by the generated electric power W of the generator.

Ar = Pr / W (3)
The reference site power amount Pr is the sum of the reference boiler side site power amount Pbr and the reference turbine side site power amount Ptr, as shown in the equation (4).

Pr = Pbr + Ptr (4)
The reference boiler side in-site electric energy Pbr is obtained from the measured exhaust gas flow rate Q1 (process amount related to the boiler side in-house electric energy) by the boiler side in-house electric energy reference formula Yb shown in FIG. Similarly, the reference turbine side in-house electric energy Ptr is obtained from the measured exhaust gas flow rate Q1 (process amount related to the turbine side in-house electric energy) by the turbine side in-house electric energy reference expression Yt shown in FIG.

  Next, an actual internal ratio A is obtained (S4). The in-house rate A is obtained by dividing the in-house power amount P by the generated power amount W of the generator, as shown in the following equation (5).

A = P / W (5)
Then, from the equations (4) and (5), as shown in the equation (6), a deviation between the reference factor Ar and the factor A is obtained as the factor ΔA (S5).

ΔA = A-Ar
= P / W-Pr / W (6)
FIG. 5 is a graph in which the vertical axis indicates the internal ratio A and the internal ratio deviation ΔA, and the horizontal axis indicates the operation time. The internal rate deviation ΔA is evaluated from the internal rate deviation ΔA graph shown in FIG. 5 to manage the internal rate (S6). That is, as shown in FIG. 5, the site ratio A varies depending on the operating conditions, but the site ratio deviation ΔA hardly changes when various auxiliary machines are normal in the boiler system and the turbine system. Therefore, when the internal ratio deviation ΔA changes to a predetermined threshold value or more, it is possible to evaluate the possibility that an abnormality has occurred in the auxiliary power of the boiler system or the turbine system.

  FIG. 6 is a flowchart showing another example of the indoor ratio management method for the conventional thermal power plant according to the embodiment of the present invention. In another example, in addition to the internal ratio deviation ΔA, the boiler internal ratio deviation ΔAb and the turbine-side internal ratio deviation ΔAt are also evaluated with respect to the example shown in FIG.

  In FIG. 6, steps S11 to S17 are provided instead of step S6 of FIG. Steps S1 to S5 are the same as those in FIG. If the internal ratio deviation ΔA is obtained in step S5, next, the reference boiler side internal ratio Abr is obtained (S11). The reference boiler side internal rate Abr is obtained by dividing the reference boiler side internal power amount Pbr obtained by the boiler side internal power amount reference expression Yb by the generated power amount W as shown in the equation (7).

Abr = Pbr / W (7)
Next, the actual boiler side ratio Ab is obtained (S12). The boiler side internal rate Ab is obtained by dividing the boiler side internal power amount Pb by the generated power amount W as shown in the equation (8). In addition, the boiler side in-site electric energy Pb calculates the shaft power Ls of each boiler system auxiliary | assistant using Formula (1), and calculates | requires, and calculates | requires the boiler side in-house electric energy Pb.

Ab = Pb / W (8)
Then, from the equations (7) and (8), as shown in the equation (9), the deviation between the reference boiler side internal rate Abr and the boiler side internal rate Ab is obtained as the boiler side internal rate deviation ΔAb (S13).

ΔAb = Ab−Abr
= Pb / W-Pbr / W (9)
Similarly, for the turbine system, first, a reference turbine side internal ratio Atr is obtained (S14). The reference turbine side site ratio Atr is obtained by dividing the reference turbine side site power amount Ptr obtained by the turbine side site power amount reference equation Yt by the generated power amount W as shown in the equation (10).

Atr = Ptr / W (10)
Next, an actual turbine side internal ratio At is obtained (S15). The turbine side internal rate At is obtained by dividing the turbine side internal power amount Pt by the generated power amount W as shown in the equation (11). The turbine-side in-house electric energy Pt is obtained by subtracting the boiler-side in-house electric energy Pb from the in-house electric power P.

At = Pt / W (12)
Then, from the equations (11) and (12), as shown in the equation (13), the deviation between the reference turbine side internal rate Atr and the turbine side internal rate At is obtained as the turbine side internal rate deviation ΔAt (S16).

ΔAt = At−Atr
= Pt / W-Ptr / W (13)
FIG. 7 is a graph when the vertical axis represents the boiler side internal rate deviation ΔAb and the turbine side internal rate deviation ΔAt, and the horizontal axis represents the operation time. From the graph of the boiler side internal rate deviation ΔAb and the turbine side internal rate deviation ΔAt shown in FIG. 7, the boiler side internal rate deviation ΔAb and the turbine side internal rate deviation ΔAt are evaluated. Are managed (S17). In step S17, the internal ratio deviation ΔA obtained in step S5 is also evaluated, and the overall internal ratio A is also managed.

  The boiler side ratio deviation ΔAb hardly changes when various auxiliary machines in the boiler system are normal. Similarly, the turbine side internal ratio deviation ΔAt hardly changes when various auxiliary machines in the turbine system are normal. Therefore, if the boiler side internal ratio Ab changes to a predetermined threshold value or more, it can be evaluated that there is a possibility that an abnormality has occurred in the auxiliary power of the boiler system, and the turbine side internal ratio At exceeds the predetermined threshold value. If it changes, it can be evaluated that there may be an abnormality in the auxiliary power of the turbine system.

  In the above description, the boiler side in-house electric energy Pb is obtained by calculating the shaft power Ls of each auxiliary machine on the boiler side and adding up these shaft powers, and the turbine side in-house electric energy Pt is obtained from the in-house electric power P from the boiler side. Although the in-house power amount Pb is subtracted, the boiler-side in-house power amount Pb and the turbine-side in-house power amount Pt may be obtained based on the currents of the boiler side auxiliary machine and the turbine side auxiliary machine.

  In this case, since the boiler side in-house power amount Pb and the turbine side in-house power amount Pt are calculated separately from the current values, the boiler side in-house power amount Pb and the turbine side in-house power amount Pt are subtracted from the in-house power amount P. The amount of power is Pz.

  First, similarly to the above-described case, a boiler-side local power amount reference formula Yb for obtaining the reference boiler-side local power amount Pbr is created in advance. At that time, as the process amount related to the boiler side power amount Pb, the total air flow rate of each of the boiler side auxiliary devices, such as the forced draft fan FDF, primary ventilator PAF, induction ventilator IDF, booster ventilator BUF, etc. Adopt Q2.

  In order to create the boiler side in-place electric energy reference formula Yb, the current Ib of the forced draft fan FDF, primary ventilator PAF, induction ventilator IDF, booster ventilator BUF, etc. over a certain period (6 months to 1 year) And the total air flow rate Q2 at that time is also collected. Then, the boiler side local power amount Pb is obtained from the current Ib of each boiler side auxiliary machine, and as shown in FIG. 8, the vertical axis is the boiler side local power amount Pb and the horizontal axis is the total air flow rate Q2. A graph in which the boiler side power consumption Pb is plotted is created. From this graph, the boiler side in-house electric energy reference expression Yb of the boiler side in-house electric energy Pb with the total air flow rate Q2 as a parameter is obtained.

  Next, a turbine-side local power amount reference formula Yt for obtaining the reference turbine-side local power amount Ptr is created in advance. In this case as well, the turbine side in-house electric energy reference expression Yt is obtained in the same manner as the boiler-side in-house electric energy reference expression Yb.

  Each turbine side auxiliary machine is a circulating water pump CWP, a condensate pump CP, a condensate booster pump CBP, a boiler feed water booster pump BFP-BP, etc. that circulate seawater to a condenser. The seawater temperature T1 is adopted as a process quantity related to the quantity Pt.

  In order to create the turbine side in-site electric energy reference formula Yt, the current It of the circulating water pump CWP, the condensate pump CP, the condensate booster pump CBP, the boiler feed booster pump BFP-BP, and the like is set for a certain period (6 months to 1 The seawater temperature T1 at that time is also collected.

  Then, the turbine-side local power amount Pt is obtained from the current It of each turbine-side auxiliary machine, and as shown in FIG. 9, the vertical axis is the turbine-side local power amount Pt and the horizontal axis is the seawater temperature T1. A graph in which the in-site electric energy Pt is plotted is created. From this graph, the turbine-side in-house electric energy reference expression Yt of the turbine-side in-house electric energy Pt with the seawater temperature T1 as a parameter is obtained.

  Next, the other in-house electric energy reference expression Yz for obtaining the reference other in-house electric energy Pzr is created in advance. In this case as well, other in-house electric energy reference formulas Yz are obtained in the same manner as the boiler-side in-house electric energy reference expression Yb. The atmospheric temperature T2 is adopted as a process amount related to the other in-house electric energy Pz.

  In order to create the other in-house electric energy reference expression Yz, the other in-house electric energy Pz is collected over a certain period (6 months to 1 year), and the atmospheric temperature T2 at that time is also collected. The other in-house electric energy Pz is obtained by subtracting the boiler-side in-house electric energy Pb and the turbine-side in-house electric energy Pt from the in-house electric energy P. As shown in FIG. 10, a graph is created in which the other in-house electric energy Pz is plotted in a coordinate system in which the vertical axis represents the other in-house electric energy Pz and the horizontal axis represents the atmospheric temperature T2. From this graph, the other in-house electric energy reference formula Yz of the other in-house electric energy Pz using the atmospheric temperature T2 as a parameter is obtained.

  In this way, the boiler-side in-house electric energy reference formula Yb, the turbine-side in-house electric energy reference expression Yt, and the other in-house electric energy reference expression Yz are created, and the boiler-side in-house electric energy reference expression Yb, the turbine-side in-house electric energy reference expression Yt Then, based on the other in-house electric energy reference formula Yz, the reference boiler-side in-house electric energy Pbr, the reference turbine-side in-house electric energy Ptr, and the reference other in-house electric energy Pzr are obtained. The sum of the reference boiler side in-house power amount Pbr, the reference turbine side in-house power amount Ptr, and the reference other in-house power amount Pzr is the reference in-house power amount.

  On the other hand, based on the current Ib of each boiler side auxiliary machine and the current It of the turbine side auxiliary machine, the actual boiler side in-house electric energy Pb, turbine side in-house electric energy Pt, and reference other in-house electric energy Pz are calculated. From these, the overall ratio A of the power plant, the internal rate deviation ΔA of the entire power plant, the boiler side local rate deviation ΔAb, the turbine side local rate deviation ΔAt, and the other internal rate deviation ΔAz are obtained.

  FIG. 11 is a graph in the case where the in-house electric energy P is calculated based on the current, where the vertical axis indicates the internal rate A and the internal rate deviation ΔA, and the horizontal axis indicates the operation time. Similarly to the case shown in FIG. 5, the internal rate deviation ΔA is evaluated from the internal rate deviation ΔA graph shown in FIG. 11 to manage the internal rate. If the in-house rate deviation ΔA changes to a predetermined threshold value or more, it is possible to evaluate the possibility that an abnormality has occurred in either the auxiliary power of the boiler system or the turbine system, or other in-house power.

  FIG. 12 is a graph in the case where the in-house electric energy P is calculated based on the current, where the vertical axis indicates the internal rate A and the boiler internal rate deviation ΔAb, and the horizontal axis indicates the operation time. From the graph of the boiler side internal rate deviation ΔAb, the boiler side internal rate deviation ΔAb is evaluated and the internal rate A is managed. In addition, the boiler side internal rate Ab may be used as a graph of the boiler side internal rate Ab and the boiler internal rate deviation ΔAb instead of the site rate A, and the boiler side internal rate Ab may be managed.

  FIG. 13 is a graph in the case where the in-house power amount P is calculated based on the current, and the in-axis ratio A and the turbine in-house ratio deviation ΔAt are taken on the vertical axis and the operation time is taken on the horizontal axis. From the graph of the turbine side internal rate deviation ΔAt, the turbine side internal rate deviation ΔAt is evaluated and the internal rate A is managed. Further, the turbine-side internal ratio At can be managed as a graph of the turbine-side internal ratio At and the turbine-side internal ratio At Δ, instead of the internal ratio A, and the turbine-side internal ratio At can be managed.

  FIG. 14 is a graph in the case where the in-house power amount P is calculated based on the current, where the vertical axis indicates the internal rate A and the other internal rate deviation ΔAz, and the horizontal axis indicates the operation time. From the graph of the other internal rate deviation ΔAz, the other internal rate deviation ΔAz is evaluated and the internal rate A is managed. Further, the other internal ratio Az may be used instead of the internal ratio A, and the other internal ratio Az may be managed as a graph of the other internal ratio Az and the other internal ratio deviation ΔAz.

  In the above description, the operation data of each boiler side auxiliary machine of the boiler system and the operation data of each turbine side equipment of the turbine system can be easily detected, but depending on the conventional thermal power plant, various auxiliary power plants There may be less detection of machine operation data. Therefore, a simple calculation of the internal ratio deviation ΔA in a conventional thermal power plant (gas thermal power) with a small number of operation data detection points will be described.

  Consider a case in which there is only operation data about the suction flow rate / FDF current of the forced air blower FDF, which is the boiler side auxiliary machine, and the GRF current of the gas / recirculation / fan GRF for blowing the combustion gas again from the bottom of the furnace. In this case, the boiler-side power amount Pb is the sum of the power amount of the forced draft fan FDF and the power amount of the gas recirculation fan GRF, and the boiler-side power amount Pb is subtracted from the power amount P. The amount of electric power is set as the turbine side local electric energy Pt. In addition, the total suction flow rate of the forced draft fan FDF is used as the process amount related to the boiler-side power amount Pb, and the condenser vacuum is used as the process amount related to the turbine-side power amount Pt.

  Reference data on the forced draft fan FDF and gas recirculation fan GRF is collected over a certain period (6 months to 1 year), and the FDF total suction flow rate and condenser vacuum degree are also collected. The reference data of the forced draft fan FDF is, for example, a suction flow rate (air flow rate), an inlet pressure, an outlet pressure, and the like, and the reference data of the gas recirculation fan GRF is a current value for driving.

  For the forced draft fan FDF, the shaft power is obtained from the formulas (1) and (2) using the collected basic data. For the gas recirculation fan GRF, the current value that is the basic data is measured. The “electric energy” is calculated, and the boiler-side local electric energy Pb is obtained.

  Then, as shown in FIG. 15, a graph is created in which the boiler side in-site electric energy Pb is plotted in a coordinate system in which the vertical axis is the boiler side in-house electric energy Pb and the horizontal axis is the FDF total suction flow rate. From this graph, the boiler side in-site electric energy reference formula Yb of the boiler side in-house electric energy Pb with the FDF total suction flow rate as a parameter is obtained.

  Next, the electric energy obtained by subtracting the boiler-side in-house electric energy Pb from the in-house electric energy P is set as the turbine-side in-house electric energy Pt, and as shown in FIG. 16, the vertical axis is the turbine-side in-house electric energy Pt and the horizontal axis is the condensate. A graph is created by plotting the turbine side in-site electric energy Pt in the coordinate system with the degree of vacuum of the vessel. From this graph, the turbine-side in-site electric energy reference expression Yt of the turbine-side in-house electric energy Pt with the condenser vacuum degree as a parameter is obtained.

  In this way, the boiler-side in-house electric energy reference formula Yb and the turbine-side in-house electric energy reference expression Yt are created, and the boiler-side in-house electric energy reference expression Yt and the turbine-side in-house electric energy reference expression Yt are used, The electric energy Pbr and the reference turbine side local electric energy Ptr are obtained. The sum of the reference boiler side in-house electric energy Pbr and the reference turbine side in-house electric energy Ptr is the reference in-house electric energy. On the other hand, the actual boiler-side power amount Pb and the turbine-side power amount Pt are calculated, and from these, the power plant-wide power factor A, the power plant-wide power factor deviation ΔA, the boiler-side power factor deviation ΔAb, the turbine side The internal ratio deviation ΔAt is obtained.

  FIG. 17 is a graph in the case where the in-house electric energy P is calculated based on a small amount of operation data, where the vertical axis indicates the internal rate A and the internal rate deviation ΔA, and the horizontal axis indicates the operation time. Similarly to the case shown in FIG. 5, the internal rate deviation ΔA is evaluated from the internal rate deviation ΔA graph shown in FIG. 17 to manage the internal rate. If the in-house rate deviation ΔA changes to a predetermined threshold value or more, it is possible to evaluate the possibility that an abnormality has occurred in either the auxiliary power of the boiler system or the turbine system, or other in-house power.

  FIG. 18 is a graph in the case where the in-house electric energy P is calculated based on a small amount of operation data, where the vertical axis indicates the boiler-side internal rate deviation ΔAb and the turbine-side internal rate deviation ΔAt, and the horizontal axis indicates the operation time. It is. From the graph of the boiler side internal ratio deviation ΔAb and the turbine side internal ratio deviation ΔAt shown in FIG. 18, the boiler side internal ratio deviation ΔAb and the turbine side internal ratio deviation ΔAt are evaluated, and the boiler side internal ratio deviation Ab and the turbine side internal ratio deviation At are evaluated. Manage.

  According to the embodiment of the present invention, the in-house electric energy P is divided into the boiler-side in-house electric energy Pb and the turbine-side in-house electric energy Pt, and, if necessary, other in-house electric energy Pz. A formula is created, and the deviation between the standard in-place ratio obtained from the reference expression and the actual in-place ratio is obtained as the in-place ratio deviation, and this in-place ratio deviation is evaluated, so the in-place ratio can be managed appropriately.

Claims (5)

  Conventional thermal power that manages the in-house rate obtained by dividing the on-site power amount of the conventional thermal power plant that generates electricity by driving steam generated in the boiler to the turbine and driving the generator connected to the turbine. In the on-site rate management method of the power plant, the boiler-side in-house electric energy reference formula for obtaining the reference boiler-side in-house electric energy using the process amount relevant to the boiler-side in-house electric energy among the in-house electric energy as a parameter Is created in advance, and a turbine-side in-house power amount reference formula for obtaining a reference turbine-side in-house electric energy with a process amount related to the turbine-side in-house electric energy as a parameter is created in advance. , The standard boiler side power obtained from the boiler side power standard based on the process amount related to the boiler side power Is calculated by dividing the reference internal power amount by the generated power, which is the sum of the reference turbine side internal power amount calculated by the turbine side internal power amount reference formula based on the process amount related to the turbine side internal power amount. The standard in-house rate is obtained, and the deviation between the in-house rate obtained by dividing the in-house power amount by the generated power amount and the reference in-house rate is obtained as an in-house rate deviation, and the in-site rate deviation is evaluated and the in-house rate is managed. A ratio management method for a conventional thermal power plant.   Dividing the reference boiler side in-house power amount obtained by the boiler side in-house power amount reference formula by the generated power amount to obtain a reference boiler side in-house rate, and dividing the boiler side in-house power amount by the generated power amount A side internal rate is obtained, a deviation between the reference boiler side internal rate and the boiler side internal rate is obtained as a boiler side internal rate deviation, and the reference turbine side internal power amount obtained by the turbine side internal power amount standard formula is calculated as the power generation Divide by the amount of power to obtain the reference turbine side in-house rate, divide the boiler side in-site power amount by the generated power amount to obtain the boiler side in-site rate, and calculate the reference turbine side in-site rate and the turbine side in-site rate. The deviation is determined as a turbine side internal rate deviation, and the boiler side internal rate deviation and the turbine side internal rate deviation are evaluated in addition to the internal rate deviation, and the boiler side internal rate and turbine side location are added to the internal rate. House rate management method of conventional thermal power plant according to claim 1, characterized in that managing the rate.   The on-site electric energy is measured with a watt-hour meter, the boiler-side in-house electric energy is obtained by calculating the shaft power of each auxiliary machine on the boiler side and totaling these shaft powers, and the turbine-side in-house electric energy is 3. The indoor rate management method for a conventional thermal power plant according to claim 1 or 2, wherein the boiler side local power amount is subtracted from the power amount.   The process amount related to the boiler-side power amount and the process amount related to the turbine-side power amount are exhaust gas flow rates discharged from a conventional thermal power plant. The in-site rate management method for a conventional thermal power plant according to any one of claims 3 to 4.   The on-site power is measured with a watt-hour meter, and the boiler-side on-site power is calculated based on the current of each boiler-side auxiliary machine to calculate the amount of power used by each boiler-side auxiliary machine. The amount of electric power in the turbine side is calculated by calculating the amount of electric power used by each turbine side auxiliary machine based on the current of each turbine side auxiliary machine. The conventional thermal power plant according to claim 1 or 2, wherein the other on-site power amount is obtained by subtracting the boiler-side on-site power amount and the turbine-side on-site power amount from the on-site power amount. How to manage the rate of

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