JP5611064B2 - Deterioration diagnosis apparatus, power generation system, and deterioration diagnosis method - Google Patents

Description

  The present invention relates to a deterioration diagnosis device, a power generation system, and a deterioration diagnosis method.

  A turbine (as an example, a gas turbine) is accelerated during startup from a stopped state to a rated state. However, if the gas turbine is deteriorated, its acceleration performance is lowered. Therefore, when it is desired to operate with the acceleration and acceleration time of the gas turbine fixed, it is necessary to increase the fuel supplied to the gas turbine at the time of startup. That is, fuel consumption is increased. This operation is generally performed automatically by a gas turbine controller.

  Patent Document 1 is a method for monitoring the performance of a gas turbine engine. During the acceleration of the engine, the regulator index from the engine controller and the time accumulated in the acceleration regulator are accumulated, and the steady state take-off output is obtained. At least one engine sensor value is monitored, and the current engine regulator usage is compared with past values of engine regulator usage obtained from previous takeoff data and the results of the comparison are utilized. A method for instructing whether or not to perform preventive maintenance on the engine is described.

JP 2006-170189 A

  By the way, in a gas turbine for generating power by connecting a generator to a rotating shaft, the gas turbine is accelerated by using the generator as an electric motor by supplying electric power to the generator when the gas turbine is activated. However, with the technique described in Patent Document 1, it is not possible to determine whether the gas turbine has deteriorated from the amount of power supplied to the generator.

  The present invention has been made in view of such circumstances, and a deterioration diagnosis device, a power generation system, and a deterioration that can determine whether or not a gas turbine has deteriorated from the amount of power supplied to the generator. An object is to provide a diagnostic method.

  In order to solve the above-described problems, the deterioration diagnosis apparatus, power generation system, and deterioration diagnosis method of the present invention employ the following means.

  That is, the deterioration diagnosis device according to the present invention is a turbine deterioration diagnosis device that is connected to a rotating shaft and is started by using the generator as an electric motor at the time of start-up. Determination means for determining deterioration of the turbine based on the total amount of electric power supplied to the machine.

According to the present invention, a turbine is deteriorated based on the total amount of electric power supplied to the generator when the turbine is started by connecting the generator to the rotating shaft and starting the generator by using the generator as an electric motor at the time of starting. Judging.
The turbine may be a gas turbine or a steam turbine.
When the turbine deteriorates, for example, the frictional force of the rotating shaft increases, and accordingly, the amount of power consumed by using the generator as an electric motor when the turbine is started increases.

  For this reason, this invention can determine the presence or absence of deterioration of a turbine from the electric energy supplied to a generator.

  In addition, the deterioration diagnosis apparatus of the present invention includes storage means for storing the total amount of electric power supplied to the generator each time the turbine is started, and the determination means is stored in the storage means. Based on the total amount of power that is present, it is determined that the turbine has deteriorated when the total amount of power is increasing.

  According to the present invention, every time the turbine is started, the total amount of electric power supplied to the generator is stored, and when the total amount of electric power is increased, it is determined that the turbine is deteriorated. Whether or not the turbine has deteriorated can be easily and accurately determined from the amount of power supplied to the generator.

  On the other hand, the power generation system according to the present invention includes: a generator; a turbine connected to the rotary shaft; and a turbine that is started by using the generator as an electric motor at start-up; and A deterioration diagnosis device.

  According to the present invention, since the deterioration of the turbine is determined based on the total amount of electric power supplied to the generator at the time of starting the turbine that is started by using the generator as an electric motor at the time of starting, supply to the generator The presence or absence of turbine deterioration can be determined from the amount of electric power generated.

  Furthermore, the deterioration diagnosis method according to the present invention is a turbine deterioration diagnosis method in which a generator is connected to a rotating shaft and is started by using the generator as an electric motor at the time of start-up. The deterioration of the turbine is determined based on the total amount of electric power supplied to the machine.

  According to the present invention, since the deterioration of the turbine is determined based on the total amount of electric power supplied to the generator at the time of starting the turbine that is started by using the generator as an electric motor at the time of starting, supply to the generator The presence or absence of turbine deterioration can be determined from the amount of electric power generated.

  According to the present invention, there is an excellent effect that the presence or absence of deterioration of the gas turbine can be determined from the amount of power supplied to the generator.

1 is a configuration diagram of a power generation system according to an embodiment of the present invention. It is a block diagram which shows the electrical structure of the deterioration diagnostic apparatus which concerns on embodiment of this invention. It is a flowchart which shows the flow of a process of the deterioration diagnostic program which concerns on embodiment of this invention. It is the graph which showed the time series of the power consumption at the time of starting of the gas turbine which concerns on embodiment of this invention.

  Hereinafter, an embodiment of a deterioration diagnosis device, a power generation system, and a deterioration diagnosis method according to the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration of a power generation system 10 using a turbine according to the present embodiment (in this embodiment, a gas turbine as an example).
The power generation system 10 is driven by a rotating shaft 12 to combust air that compresses air to generate compressed air, burns fuel and compressed air generated by the compressor 14, and generates combustion gas. , A gas turbine 18 driven by combustion gas generated by the combustor 16, a generator 20 connected to the rotating shaft 12 of the gas turbine 18, and a deterioration diagnosis device 22 for diagnosing the deterioration state of the gas turbine 18. ing.

Since the rotational driving force generated in the gas turbine 18 is transmitted to the generator 20 by the rotating shaft 12, the generator 20 generates electric power by the rotational driving force of the gas turbine 18.
Further, the generator 20 is supplied with power from the system power via the starter panel 24 and can be used as an electric motor. Note that the activation board 24 according to the present embodiment uses a thyristor as an example.

  Furthermore, the gas turbine 18 according to the present embodiment is started by rotating the rotating shaft 12 by using the generator 20 as an electric motor while supplying the combustion gas from the combustor 16 at the time of starting.

When the gas turbine 18 deteriorates, the frictional force of the rotating shaft 12 increases, and accordingly, the amount of power consumed by using the generator 20 as an electric motor when the gas turbine 18 is started up also increases.
For this reason, the deterioration diagnosis device 22 according to the present embodiment also monitors the amount of fuel supplied to the combustor 16 and the amount of power supplied to the generator 20 used as an electric motor in a series of startup sequences of the gas turbine 18. Thus, it is determined whether or not the gas turbine 18 has deteriorated.
The series of startup sequences refers to a sequence from when the gas turbine 18 in a stopped state starts to accelerate until the rated speed is reached.

FIG. 2 is a block diagram showing an electrical configuration of the deterioration diagnosis device 22 according to the present embodiment.
The degradation diagnosis device 22 according to the present embodiment includes a CPU (Central Processing Unit) 30 that controls the operation of the entire degradation diagnosis device 22, a ROM (Read Only Memory) 32 in which various programs, various parameters, and the like are stored in advance, and various types of operations performed by the CPU 30. A RAM (Random Access Memory) 34 used as a work area at the time of program execution, and an HDD (Hard Disk Drive) 36 as a storage means for storing various programs and various data are provided.

  Further, the deterioration diagnosis device 22 includes a keyboard, a mouse, and the like. The operation input unit 38 receives various operation inputs, displays various images, for example, an image display unit 40 such as a liquid crystal display device, and a communication line 42. And an external interface 44 for inputting various data.

  The CPU 30, ROM 32, RAM 34, HDD 36, operation input unit 38, image display unit 40, and external interface 44 are electrically connected to each other via a system bus 46. Accordingly, the CPU 30 performs access to the ROM 32, RAM 34, and HDD 36, grasps the operation state of the operation input unit 38, displays an image on the image display unit 40, accepts input of various information via the external interface 44, and the like. Can be done.

Note that the deterioration diagnosis device 22 transmits data (hereinafter referred to as the total amount of electric power) supplied (consumed) from the startup panel 24 to the generator 20 in the series of startup sequences of the gas turbine 18 via the external interface 44. "Power consumption data") and are input.
Further, in the deterioration diagnosis device 22, in a series of startup sequences of the gas turbine 18, the external interface 44 is data (hereinafter, referred to as total fuel amount) supplied (consumed) to the combustor 16 via the external interface 44. "Fuel consumption data") is input.
The deterioration diagnosis device 22 stores the input power consumption data and fuel consumption data in the HDD 36 as operation record data associated with the date and time when these data were acquired.

FIG. 3 is a flowchart showing a flow of processing of a deterioration diagnosis program executed by the CPU 30 when the deterioration diagnosis device 22 performs deterioration diagnosis processing using power consumption data. Pre-stored in the area.
The deterioration diagnosis process is executed when new power consumption data is input to the deterioration diagnosis device 22, for example.

  First, in step 100, the operation record data stored in the HDD 36 is read.

  In the next step 102, the past power consumption data recorded as the operation record data is collated with the inputted power consumption data.

  In the next step 104, it is determined whether or not the electric power consumed when the gas turbine 18 is started up. If the determination is affirmative, it is determined that the gas turbine 18 has deteriorated, and the routine proceeds to step 106. On the other hand, if the determination is negative, this program is terminated.

  The deterioration diagnosis device 22 according to the present embodiment makes an affirmative determination in step 104 when the amount of change in power consumption at the startup of the gas turbine 18 is greater than or equal to a predetermined amount of change, and the gas turbine 18 has deteriorated. Judge.

An example of a case where an affirmative determination is made in step 104 will be described with reference to FIG.
FIG. 4 shows, in time series, changes in the power consumption when the gas turbine 18 is started, with the horizontal axis being the start date and time of the gas turbine 18 and the vertical axis being the power consumption when the gas turbine 18 is started. It is a graph.
Then, as shown in FIG. 4, the power consumption amount at the time of starting the gas turbine 18 increases, and an approximate expression of the value of a plurality of times (four times in the example of FIG. 4) including the input power consumption data. When the inclination of is equal to or greater than a predetermined inclination, the deterioration diagnosis device 22 determines that the gas turbine 18 is deteriorated.

In addition, the case of making a positive determination is not limited to this. For example, the value of the input power consumption data is a ratio (for example, 10%) determined in advance compared to the average value of past power consumption data. ) It may be a case where it has increased.
Moreover, it is good also as a case where it is set as affirmation determination when the value of the input electricity consumption data becomes more than predetermined consumption. In this case, it is not necessary to collate the input power consumption with the past power consumption data.

In the next step 106, a notification process for notifying that the gas turbine 18 has deteriorated is performed. Examples of the notification process include a process of displaying an image indicating that the gas turbine 18 is deteriorated on the image display unit 40, a process of notifying by voice through a speaker (not shown), and the like.
In the notification process, a graph as shown in FIG. 4 may be displayed on the image display unit 40. The driver of the power generation system 10 can determine the inspection time of the gas turbine 18 from the graph displayed on the image display unit 40.

  Note that the deterioration diagnosis device 22 may determine the degree of deterioration of the gas turbine 18 from the magnitude of the slope of the approximate expression, and may notify the inspection timing of the gas turbine 18 based on the degree.

  Further, the deterioration diagnosis device 22 uses the input fuel consumption data and the fuel consumption data stored as operation record data in the HDD 36 to perform the same process as the deterioration diagnosis process using the power consumption data. May be performed.

  As described above, the deterioration diagnosis device 22 according to the present embodiment has the generator 20 connected to the rotary shaft 12 and the generator when starting the gas turbine 18 that starts by using the generator 20 as an electric motor when starting. Deterioration of the gas turbine 18 is determined based on the total amount of electric power supplied to the gas turbine 20.

  Therefore, the deterioration diagnosis device 22 according to the present embodiment can determine the presence or absence of deterioration of the turbine from the amount of power supplied to the generator.

  Further, the deterioration diagnosis device 22 of the present invention stores the total amount of power supplied to the generator 20 in the HDD 36 every time the gas turbine 18 is started, and the gas amount is increased when the total amount of power increases. Since it is determined that the turbine 18 has deteriorated, it is possible to easily and accurately determine whether the gas turbine 18 has deteriorated from the amount of power supplied to the generator 20.

  As mentioned above, although this invention was demonstrated using the said embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above-described embodiment without departing from the gist of the invention, and embodiments to which the changes or improvements are added are also included in the technical scope of the present invention.

  For example, in the above embodiment, the form using the gas turbine 18 as the turbine of the power generation system 10 has been described, but the present invention is not limited to this, and a form using a steam turbine as the turbine may be used.

  In addition, the flow of processing of the deterioration diagnosis program described in the above embodiment is also an example, and unnecessary steps are deleted, new steps are added, or the processing order is changed within a range not departing from the gist of the present invention. Needless to say, it can be done.

DESCRIPTION OF SYMBOLS 10 Power generation system 18 Gas turbine 20 Generator 22 Deterioration diagnostic apparatus 30 CPU
36 HDD

Claims (4)

A turbine deterioration diagnosis device that is connected to a rotating shaft and is started by using the generator as an electric motor at the time of starting,
Determination means for determining deterioration of the turbine based on a total amount of electric power supplied to the generator at the time of startup of the turbine;
Deterioration diagnosis device with Storage means for storing the total amount of power supplied to the generator each time the turbine is started,
With
2. The determination unit according to claim 1, wherein the determination unit determines that the turbine is deteriorated when the total amount of electric power is increasing based on the total amount of electric power stored in the storage unit. Deterioration diagnostic device. A generator,
A turbine connected to the rotating shaft and started by using the generator as an electric motor at the time of starting;
The deterioration diagnosis apparatus according to claim 1 or 2,
Power generation system with A turbine deterioration diagnosis method in which a generator is connected to a rotating shaft and the generator is started by using the generator as an electric motor at startup,
A deterioration diagnosis method for determining deterioration of the turbine based on a total amount of electric power supplied to the generator when the turbine is started.

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