JPH028122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turbine operation control device, and more particularly to a turbine operation control device suitable for starting a thermal or nuclear power plant.

Generally, startup of a turbine power plant, such as a thermal power plant, is performed as shown in FIG.
That is, before boiler ignition, the air system, water supply system, and fuel system are configured. When the conditions for boiler ignition are met, the boiler is ignited and the boiler is heated to generate steam temperature and pressure for turbine ventilation. The temperature of the water/steam inside the can and the steam pressure are increased. Next, when the steam temperature and pressure reach a point where turbine ventilation is acceptable, turbine speed increase control is entered and turbine operation control is performed in accordance with turbine metal matching conditions.

Fig. 2 shows a conventional example of a turbine operation control device in a thermal power plant, in which an input unit 1 inputs a plant signal a from the plant, and sends plant status information b to an arithmetic unit 2 for control operation judgment. The plant information c is given to the section 4.

Based on the plant status information b from the input unit 1, the calculation unit 2 performs turbine metal matching calculations in addition to turbine ventilation, and calculates the turbine speed increase rate, low speed warm-up time, high speed warm-up time, load increase rate after joining, The initial load warm-up time is calculated and given to the calculation result memory section 3 as calculation result information d, and is stored in the calculation result memory section.

At this time, the calculation section 2 periodically performs turbine metal matching calculations until the turbine ventilation is reached, and updates the contents of the memory section 3 with the latest information.
On the other hand, after turbine ventilation, the calculation result information at the time of turbine ventilation is held in the memory section 3 without updating the turbine metal matching calculation results.

The control operation determination unit 4 determines the content of the control operation to be performed currently based on the plant information c from the input unit 1, and calculates the result of the turbine metal matching calculation held in the calculation result memory unit 3. is used as memory information e, and a control execution command f is given to the control operation execution unit 5.

The content of the judgment made by the control operation judgment unit 4 regarding the control that should be executed currently is the initial speed up to the love check before the turbine main body is attached, the speed increase during the love check, the speed increase after the love check, and the low speed based on the turbine rotation speed and generator power. Warm-up rotation speed retention time, speed increase after low-speed warm-up, high-speed warm-up retention time at rated rotation speed, uniform speed after constant speed warm-up, load increase up to the initial load after combination, initial load warm-up The objective is to determine whether to perform control corresponding to the current state of the turbine by distinguishing between the holding time and the stage during the load increase after initial load warm-up.

As a result, a control execution command f is given to the control operation execution unit 5 as the control content.

The control operation execution section 5 executes the control content corresponding to the control command f, and provides it to the control command output section 6 as a control command g.

The control command output unit 6 outputs a drive signal h to the turbine drive motor 7 in accordance with the control command g.

By increasing or decreasing the rotation of the turbine drive motor 7, the main steam stop valve bypass valve (MSV-BV) 9 is opened or closed via the valve drive mechanism 8.
The amount of steam supplied to the turbine 12 is adjusted by the opening degrees of the main steam stop valve (MSV) 10 and the control valve (CV) 11, and the rotation speed of the turbine 12 and the output of the generator 13 are controlled.

In this way, during the unit start-up process of a power plant, from the time the unit starts to the unit's full-load operating state, the temperature, pressure, and turbine speed increases after the clean-up boiler ignition in the water supply system. There are control operations such as warming up the turbine, equalizing the pressure of the electrical system, bringing the turbine at equal speed, increasing the load, and switching the FA/PA valves, and the time required for this usually ranges from several hours to a few hours.

In particular, from turbine speed increase to FA/PA valve switching, due to the relationship between the steam conditions due to the main steam temperature and pressure at the turbine inlet and the metal temperature of the turbine rotor,
It is a major prerequisite for turbine operation that the turbine speed increase rate, low speed warm-up time, high speed warm-up time, load increase rate after merging, and initial load warm-up time calculated based on the turbine metal matching conditions are strictly observed. .

This was chosen to avoid excessive thermal stress on the rotor, which occurs when the turbine rotor is rapidly heated by high-temperature, high-pressure steam flowing into the turbine, or in other words, to minimize rotor life consumption. This is a control method that

However, in a power generation plant, due to external factors such as the power system situation or the situation at other power plants, it is difficult to start up the power plant as soon as possible, knowing that some thermal stress will occur in the rotor. There are times when you want to do so. In addition, during test start-ups at the end of periodic inspections of power generation plants, due to safety tests, etc.
You may want to extend the startup time.

However, in the conventional turbine control device described above, the schedule from turbine speed increase to FA/PA valve switching is uniformly determined by turbine metal matching calculations before turbine ventilation, which reduces the startup time of the power plant. I couldn't do it or extend it. Therefore, if one were to dare to change the start-up time, the operator would have no choice but to operate the turbine manually, which would increase the burden on the operator, make smooth operation difficult, and risk compromising safety. It was hot.

An object of the present invention is to provide a turbine operation control device that eliminates the drawbacks of the conventional devices described above and can automatically operate a power plant safely and smoothly by arbitrarily changing the turbine startup time based on instructions from an operator. shall be.

In order to achieve this object, the present invention is characterized in that the turbine metal matching calculation results stored and held in the memory can be changed from the outside.

Hereinafter, the present invention will be explained with reference to the embodiments shown in the figures.

FIG. 3 shows a configuration diagram of a turbine control device according to an embodiment of the present invention, and in the figure, the same reference numerals as in FIG. 2 indicate the same or corresponding parts. With the configuration shown in the diagram,
The difference from FIG. 2 is that a control operation modification request receiving section 20 and a control operation request determining section 21 are further added.

The control operation modification request receiving unit 20 is configured not to accept a modification request l from an operator unless ventilation of the turbine is completed. In other words,
An interlock is provided such that a modification request is accepted after each condition such as the turbine speed increase rate and low-speed warm-up time for turbine operation control based on turbine metal matching calculation is held constant in the calculation result memory section 3.

The control operation modification request determining section 21 checks the validity based on the modification information m from the modification request receiving section 20, and if it is OK, the content stored in the calculation result memory section 3 is read by the memory modification command n. change. If there is no validity, the memory modification n is configured not to be issued.

Regarding the control operation modification request receiving section 20 and the control operation modification request determining section 21, as shown in FIG. a request determination unit 202; a control operation modification request determination unit 21;
are the correction information judgment unit 211 and the correction information output unit 212
It is made up of.

With the above configuration, if an operator wants to quickly start up a power plant, for example to supplement the electricity that was being output by another power plant due to a trip, the operator can use the console. Through this process, you will need to modify the parameters to complete the startup.

These parameters include the main steam temperature at the turbine inlet, the turbine speed increase rate calculated from the relationship between the steam conditions due to pressure and the turbine rotor metal temperature (first stage inner metal temperature) using conventionally known turbine metal matching conditions. , slow warm-up time,
There is a fast warm-up time, initial load warm-up time, and load increase rate. Regarding these parameters, for example, when you need to start up the turbine quickly, various calculated values (low speed, low speed,
For example, the warm-up time for high speed, initial load) is set to zero (“0”).
minutes). This can be done, for example, by entering the correction value in the box of the corresponding item on the screen displayed on the console shown in FIG.

On the other hand, when it is necessary to lengthen various warm-up times for safety tests or the like, a warm-up time that is larger than the value calculated by the turbine metal matching calculation will be set and input.

In this manner, when a correction request l is received from an operator, the input unit 201 inputs the correction details (items and their values) from the console. The input unit 202 outputs the modification content of the modification request 1 to the request determination unit 202. When the request determination unit 202 inputs this modification request l, it checks whether the current plant state is turbine ventilation and the turbine metal matching calculation has been finalized, and if it has not been determined, invalidates the modification request l. shall be. This is because turbine metal matching calculations are periodically and repeatedly executed until the turbine ventilates, and it is meaningless to make any modifications until they are finalized, as they will be automatically changed.

If the turbine ventilation has been completed and the final turbine metal matching calculation has been determined, the items and their values modified by the operator in order to modify the memory unit 3 that stores the calculation results are used as modification information m. It is output to the control operation modification request determination unit 21.

The modification information determination unit 211 of the control operation modification request determination unit 21 determines whether the modified item is an operation that has already been completed, based on the modification information m, and if the modification is for an operation that has already been completed, it is invalid. do.
If the operation has not been completed, the modification information m is determined to be valid and is output to the modification information output unit 212. The modification information output unit 212 outputs the corresponding item and its value to the memory unit 3 as a memory modification command n in order to change the information stored in the memory unit 3 based on the information from the modification information determination unit 211.

As a result, the contents of the memory section 3 are rewritten to 0 for each warm-up time as shown in FIG.

In this way, if you want to shorten the startup time, all you have to do is determine what state you want the plant to be in after how many minutes from now, and modify the contents of the memory section 3 set by the metal matching calculation accordingly. Then, the turbine control device automatically executes the startup control as corrected. The example shown in FIGS. 5 and 6 is an example in which the time until the load rises is 53 minutes earlier than scheduled by setting each warm-up time to 0.

Also, when extending the startup time due to safety tests, etc., by freely modifying the parameters set in the memory section 3, it is possible to arbitrarily extend the test area, such as the low-speed warm-up time. .

In this way, by individually modifying the necessary turbine metal matching calculation results stored in the memory unit 3, it is possible to partially extend or shorten the start-up process, making it possible to perform maintenance tests. This can greatly improve work efficiency.

Furthermore, according to the turbine control device of this embodiment,
Even when it is necessary to start up a power generation plant urgently due to circumstances in the power system or other power plants, the operator can simply add a request to modify the control operation, and the operator can avoid burdening the operator or restart the power plant as usual. It is possible to safely and smoothly start up a power plant in an emergency without compromising stability.

That is, a turbine control device is normally used to operate the turbine, and is configured to be activated based on the value determined by the turbine metal matching calculation. If an attempt is made to start operation that is different from what has been determined by this turbine metal matching calculation, for example to shorten the low-speed holding time, the low-speed holding time will differ from the one stored in the turbine control device, so Unable to drive. This is because the turbine control device is determined to move to the next upper part of the turbine after the stored low speed holding time has elapsed. As a result, the turbine cannot be started using the turbine control device, so the operator has no choice but to operate the turbine manually, which reduces the burden on the operator who is responsible for monitoring the operation of the entire power plant. It turns out.

However, according to this embodiment, even if the value determined by the turbine metal matching calculation is modified, the turbine can be operated using the turbine starting device, and the turbine can be started safely and smoothly as before. become.

It should be noted that the control operation modification requests 1 accepted by the modification request receiving unit 20 may be set with individual limit values depending on the plant status at the time, and modification requests may be accepted within the limit range. good.

As described above, according to the present invention, it is possible to obtain a turbine operation control device that can easily and externally modify the startup time of a turbine and start a power plant safely and smoothly.

[Brief explanation of drawings]

FIG. 1 is a typical startup curve diagram in a thermal power plant; FIG. 2 is a configuration diagram of a conventional turbine operation control device; FIG. 3 is a configuration diagram of a turbine operation control device according to an embodiment of the present invention; 4 is an internal block configuration diagram of the control operation modification request receiving unit 20 and control operation modification request determining unit 21 shown in FIG. 3, and FIG. 5 is a display screen explanation showing an example of the display on the console when modifying the turbine startup operating parameters. FIG. 6 is an explanatory diagram of a memory content modification operation for explaining the modification operation of the turbine startup operation parameters stored in the memory unit 3. DESCRIPTION OF SYMBOLS 1... Input part, 2... Calculation part, 3... Calculation result memory part, 4... Control operation judgment part, 5... Control operation execution part, 6... Control command output part, 7... For turbine drive Motor, 8... Valve drive mechanism, 9... Main steam stop valve bypass valve, 10... Main steam stop valve, 11...
...Adjustment valve, 12...Turbine, 13...Rotation speed control generator, 20...Control operation modification request reception unit, 2
1... Control operation request determination unit.

Claims (1)

[Claims] 1. An input unit that inputs plant status signals from the power generation plant, a calculation unit that performs turbine metal matching calculations based on the input signals, a memory unit that stores the calculation results, and an input unit that inputs plant status signals from the power generation plant, and a memory unit that stores the calculation results. a control operation determining unit that determines the content of the control operation to be performed from the memory unit and outputs a necessary control command based on the calculation result stored in the memory unit, and controls the operation of the turbine based on the control command. In the operation control device,
Furthermore, a control operation modification request receiving section that receives a control operation modification request from an operator and a control operation modification request determining section that determines the validity of the control operation modification request are provided. The turbine speed increase rate, low-speed warm-up time, high-speed warm-up time, initial load warm-up time, and load increase rate calculated by the final turbine metal matching calculation before turbine startup are corrected externally, and the turbine is started. A turbine operation control device characterized by being able to change time.