JPH0926814A - Plant starting support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely perform the frequent plant starting operations by detecting a deviation of a prescribed output pattern range after reception of a plant output signal and outputting the operating gist that is necessary for the starting support of the plant. SOLUTION: For instance, a GT(gas turbine) output signal 1S, a steam temperature signal 2S, a steam pressure signal 3S and a TB(turbine) valve opening amount signal 4S vary when a plant is started. A pattern range is previously inputted to each of abnormality detectors 1 to 4 at the starting time of the plant and with a time point set after the GTs are placed in parallel to each other defined as a starting point. For instance, both upper and lower limit value of a prescribed steam temperature signal pattern range are previously inputted to the steam temperature abnormality detector 2. Then the detector 2 detects a point where the actual signal 2S gets out of the upper and lower limit value of the preceding pattern range. This detected point is outputted as an abnormality signal. The same operations are secured by other detectors 1, 3 and 4. A diagnostic device 5 diagnoses the abnormality based on the program that is previously inputted after the abnormality signal is received from each of detectors 1 to 4 and outputs the corresponding operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant start-up support device applied to a cogeneration plant that frequently starts and stops.

[0002]

2. Description of the Related Art In a recent cogeneration power plant, it is required to supply as much electricity as necessary and at a required time, and therefore it is necessary to start and stop it frequently and always at a scheduled time. APS that has been conventionally applied to power plants
The device with the (Auto Plant Start) function outputs a BP (breakpoint) command signal to prevent a startup delay, and if the next BP is not reached within a certain period of time, the AP
It has a mechanism to output S traffic jam warning. However, A
At the time when the PS traffic jam warning is output, a start-up delay has already occurred, and even after that, even if the operator takes an appropriate countermeasure, this delay cannot be recovered.

[0003]

In the device having the APS function applied to the above-mentioned conventional power plant,
At the time when the APS traffic congestion warning was issued, there was a problem that the start-up delay had already occurred, and even if the operator thereafter took appropriate countermeasures, this delay could not be recovered.

[0004]

The present invention employs the following means to solve the above-mentioned problems. (1) A plant abnormality detector that receives a plant output signal to detect deviation from a predetermined output pattern range, and a plant abnormality signal that is received from the plant output signal and the output of the plant abnormality detector to diagnose a plant abnormality, and are needed for start-up support And a diagnostic device that outputs various operating procedures.

In the above, the plant abnormality detector receives the plant output signal, detects the deviation from the predetermined output pattern range and outputs it. The diagnostic device receives the output of the plant abnormality detector and the plant output signal,
It diagnoses plant abnormalities and outputs the operating procedure required for startup support. The operator receives this output and operates according to the operating procedure.

In this way, an appropriate start-up support operation can be performed without causing a timing delay, and frequent plant start-up can always be reliably performed. (2) In the above-mentioned plant startup support device, a display device for displaying the output of the diagnostic device is provided.

In the above, the display device receives the output of the diagnostic device and displays the operating procedure necessary for the start-up support. The operator sees this display and operates according to the display.

In this way, an appropriate start-up support operation can be performed without causing a timing delay, and frequent plant start-up can always be reliably performed. (3) In the plant start-up support device of the above 1, the plant output signal is a gas turbine output signal, a steam temperature signal,
It is set to be a steam pressure signal or a turbine opening signal.

In the above, the plant abnormality detector receives the gas turbine output signal, the steam temperature signal, the steam pressure signal, or the turbine opening signal, detects the deviation from the preset predetermined pattern range, and outputs it. To do. The following functions substantially in the same manner as the above 1.

In this way, appropriate start-up support operation can be performed without causing a timing delay, and frequent plant start-up can always be reliably performed. (4) In the plant startup support device of the above-mentioned 1, the plant abnormality detector is a gas turbine abnormality detector, a steam temperature abnormality detector, a steam pressure abnormality detector, or a turbine valve opening abnormality detector.

In the above, the gas turbine abnormality detector,
The steam temperature abnormality detector, the steam pressure abnormality detector, or the turbine valve opening abnormality detector receives the plant output signal and detects and outputs the deviation from the preset predetermined pattern range. The following functions substantially in the same manner as the above 1.

In this way, appropriate start-up support operation can be performed without causing a timing delay, and frequent plant start-up can always be reliably performed.

[0013]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG.

In FIG. 1, the gas turbine (GT) output signal 1s is sent to the diagnostic device 5 directly and via the GT output abnormality detector 1. The steam temperature signal 2s is sent to the diagnostic device 5 directly and via the steam temperature abnormality detector 2. The steam pressure signal 3s is sent to the diagnostic device 5 directly and via the steam pressure abnormality detector 3. The turbine (TB) valve opening degree signal 4s is sent to the diagnostic device 5 directly and via the TB valve opening abnormality detector 4. The output of the diagnostic device 5 is sent to the display device 6.

In the above, when the combined cycle power plant is started, for example, the GT output signal 1s, the steam temperature signal 2s, the steam pressure signal 3s, and the TB valve opening signal 4s change as shown in FIG.

Each of the abnormality detectors 1 to 4 has a G
After the Ts are arranged in parallel, the pattern range is preliminarily input starting from the time point shown in Table 1.

[0017]

[Table 1]

The steam temperature abnormality detector 2 has a predetermined steam temperature signal pattern range, for example, as shown in FIG.
The range between the upper limit value b and the lower limit value c is input in advance. When the actual steam temperature signal 2s changes as shown by the dotted line e, the lower limit value c is exceeded at point a, so this point a is detected and output as an abnormal signal.

The other abnormality detectors 1, 3 and 4 operate similarly. When the diagnostic device 5 receives an abnormal signal from each of the anomaly detectors 1 to 4, the diagnostic device 5 uses an MYCIN method (developed by Stanford University Short Liffe in 1976) based on an FT (fault tree) diagram as a program. Then, the abnormal state is diagnosed and the corresponding operation is output.

For example, when the steam temperature signal 2s is abnormal, the program based on the FT diagram shown in FIG. 4 is input. In the figure, 11, 12, and 13 are causes, 14, 15 and 16 are derived events, and 17 is an abnormal event, and R _{1 to} R ₃ (0.0 to ₁ .
0) is an empirically determined weighting coefficient. R ₁₁ ,
R ₁₂ and R ₁₃ are correlation coefficients indicating the strength of the relationship between the cause and the derived event. V ₁₁ , V ₁₂ , and V ₁₃ are event evaluation values that indicate the degree of occurrence of derivative events, and normally a threshold function as shown in FIG. 5 is used.

Then, the confidence factor CF value of each cause is calculated by the equations (1) to (3).

CF ₁ = R ₁ (1-R ₁₁ V ₁₁ ) (1-R ₁₂ V ₁₂ ) (1-R ₁₃ V ₁₃ ) ... (1) CF ₂ = R ₂ (1-R ₂₁ V ₂₁ ) ( _{1-R 22 V 22) (} 1-R 23 V 23) ... (2) CF 3 = R 3 (1-R 31 V 31) (1-R 32 V 32) (1-R 33 V 33) ... ( 3) When these CF _i are greater than or equal to a predetermined value, the operation signal for each is sent to the display device 6 together with the abnormal event signal for display.

For example, when CF ₁ is a predetermined value or more, the display device 6 displays "low steam temperature" as an abnormal event and "GT output setting increasing operation" as an operation signal. Seeing this display, the operator performs the GT output setting increasing operation. By this operation, the abnormality is recovered and the process sequentially shifts to the next BP, and the plant is surely started without a start delay.

FIG. 6 shows an FT diagram when the vapor pressure is abnormal. Since other abnormalities such as GT output abnormality are almost the same, the description thereof will be omitted.

[0025]

According to the present invention as described above,
When an abnormality occurs during the startup of the cogeneration power plant and a delay in startup is expected, the operator can operate the operator according to the operation display to ensure the startup of the plant.

[Brief description of drawings]

FIG. 1 is an overall configuration block diagram of an exemplary embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the embodiment.

FIG. 3 is a diagram for explaining the operation of the embodiment.

FIG. 4 is an operation explanatory view of the embodiment.

FIG. 5 is an operation explanatory view of the embodiment.

FIG. 6 is an operation explanatory view of the embodiment.

[Explanation of symbols]

 1 GT output abnormality detector 2 Steam temperature abnormality device 3 Steam pressure abnormality device 4 TB valve opening abnormality device 5 Diagnostic device 6 Display device 11 GT output low 12 TB valve opening large 13 Spray valve open 14 GT output <standard value 15 TB valve opening> standard value 16 steam temperature <specified value and spray valve open 17 low steam temperature 18 GT output setting increase operation 19 TB valve close operation 20 spray valve close operation

Claims (4)

[Claims] 1. A plant abnormality detector for receiving a plant output signal and detecting deviation from a predetermined output pattern range,
A plant start-up support device, comprising: a diagnosis device that receives the output of the plant output signal and the output of the plant abnormality detector and diagnoses a plant abnormality and outputs an operating procedure required for start-up support. 2. The plant start-up assistance device according to claim 1, further comprising a display device for displaying an output of the diagnostic device. 3. The plant start-up support device according to claim 1, wherein the plant output signal is a gas turbine output signal,
A plant start-up support device, which is a steam temperature signal, a steam pressure signal, or a turbine opening signal. 4. The plant start-up support device according to claim 1, wherein the plant abnormality detector is a gas turbine abnormality detector, a steam temperature abnormality detector, a steam pressure abnormality detector, or a turbine valve opening abnormality detector. A plant start-up support device characterized in that