KR20120131755A - Turbine generator control apparatus of steam generating plant - Google Patents

Abstract

PURPOSE: A device for operating a turbine generator in a steam power plant is provided to be operated without a noticeable decrease of power by controlling the pressure of steam and reheat steam according to pressure changes. CONSTITUTION: A device for operating a turbine generator in a steam power plant comprises a turbine unit(10), a water supply pump(30), a first boiler(40), a second boiler(50), a main control valve(60), an intercept valve(70), and a control unit(80). The main control valve is installed in first and fifth pipelines and controls the supply. The fifth pipeline supplies main steam supplied through the third pipeline to a high pressure steam turbine. The intercept valve is installed in second and sixth pipelines and controls the supply. The sixth pipeline supplies reheat steam supplied through a fourth pipeline to a middle pressure steam turbine. The control unit controls the control valve and intercept valve according to pressure changes of the main steam and reheat steam. [Reference numerals] (80) Control unit

Description

TURBINE GENERATOR CONTROL APPARATUS OF STEAM GENERATING PLANT}

The present invention relates to a turbine generator operation apparatus of a power plant, and more specifically, it is possible to operate even one boiler failure during operation using two boilers and one turbine unit, and to the high pressure steam turbine and the medium pressure steam turbine The present invention relates to a turbine generator operating device of a steam power plant that throttles the main steam pressure and the reheat steam pressure applied thereto.

In general, power plants have facilities for converting thermal energy and mechanical energy into electrical energy, and rotate the turbine using energy sources such as water, coal, natural gas or nuclear power, and generate electricity through a generator connected to the turbine.

Power plants are divided into hydroelectric power plants, thermal power plants, nuclear power plants, and combined cycle power plants according to the type of energy source used and the power generation method.

The thermal power plant combines a combination of a power plant using a boiler and a steam turbine, an internal combustion power plant using an internal combustion period such as a diesel engine, a gas turbine power plant using a gas turbine, and a combination of a gas turbine and a steam turbine, depending on the type of prime mover. De cycle power plants.

Among them, the thermal power generation is most commonly used for business thermal power generation because of its high thermal efficiency and high power.

Conventional power plants are typically configured to produce power by using one boiler and one turbine, and the water introduced into the boiler through the feed water pump is converted into steam and supplied to the turbine through a pipeline.

The propeller is rotated by steam supplied to the turbine to produce power in the generator, and the water discharged from the turbine is condensed in the condenser through a pipeline and circulated in a closed circulation through a feed water pump to produce power.

The above-mentioned invention means the background art of the technical field to which the present invention belongs, and does not mean the prior art.

However, since existing boilers produce electric power with one boiler and one turbine unit, when the boiler fails, the turbine and the generator are also stopped, so that the power production efficiency is significantly lowered.

Therefore, there is a need to improve this.

The present invention is created by the necessity as described above, and operates with two boilers and one turbine unit, so that one boiler can be operated even if one boiler fails, thereby minimizing restart losses due to the stop of the power generation system. It is an object of the present invention to provide a turbine generator operating device for a power plant.

In addition, the main steam valve and the reheat steam pressure are interlocked with each other according to the pressure change by using the main control valve installed in the pipeline connected to the high pressure steam turbine and the intercept valve installed in the pipeline connected to the medium pressure steam turbine. It is an object of the present invention to provide a turbine generator operating apparatus of a nuclear power plant that allows operation without any decrease in output.

In order to achieve the above object, a turbine generator operating apparatus of a power plant according to an embodiment of the present invention includes a turbine unit having a high pressure steam turbine, a medium pressure steam turbine and a low pressure steam turbine; A water supply pump for supplying steam discharged from the low pressure steam turbine in a state in which the water condensed in the condenser is introduced and boosted; A first boiler in which water from the feed water pump flows into the first pipe line and is converted into main steam, and steam discharged from the high pressure steam turbine flows into the second pipe line and converts into reheat steam; A second boiler in which water from the feed water pump flows into a third pipe line and is converted into main steam, and steam discharged from the high pressure steam turbine flows into a fourth pipe line and converts into reheat steam; A main control valve installed in a fifth conduit for supplying the main steam supplied through the first conduit and the third conduit to the high-pressure steam turbine; An intercept valve installed in a sixth conduit for supplying the reheat steam supplied through the second conduit and the fourth conduit to the medium pressure steam turbine; And a control unit controlling the main control valve and the intercept valve according to a pressure change of the main steam and the reheat steam in the fifth pipe line and the sixth pipe line.

The first boiler may further include: a first main heating unit configured to absorb the main heat by arranging the first pipe line; And a first reheating unit in which the second conduit is disposed to absorb reheating.

The second boiler may further include: a second main heating unit configured to absorb the main heat by arranging the third pipe; And a second reheating unit arranged to absorb the reheat.

In addition, the main control valve and the intercept valve is characterized in that the throttle valve (throttle valve) for controlling the moving speed and the steam pressure of the steam by adjusting the opening amount of the pipeline.

In addition, when any one of the first boiler or the second boiler is broken, the controller performs throttling control by interlocking the main control valve and the intercept valve, and moves in the fifth conduit according to throttling control of the controller. The pressure of the steam is maintained at 230 to 260 bar, and the pressure of the reheat steam moving through the sixth pipe is maintained at 45 to 55 bar.

As described above, the turbine generator operating apparatus of the power plant according to the present invention is operated by two boilers and one turbine unit, so even if one boiler fails, the other boiler can be operated to stop the power generation system. The restart loss caused by this can be minimized.

In addition, the main steam valve and the reheat steam pressure are interlocked with each other according to the pressure change by using the main control valve installed in the pipeline connected to the high pressure steam turbine and the intercept valve installed in the pipeline connected to the medium pressure steam turbine. In this case, it can be operated without noticeable power loss.

1 is a block diagram of a turbine generator operating apparatus of a power plant according to an embodiment of the present invention.
FIG. 2 is a view illustrating a state in which the main steam pressure and the reheat steam pressure are not controlled by the main control valve and the intercept valve in FIG. 1.
3 is a view showing a state of controlling the main steam pressure and the reheat steam pressure to the main control valve and the intercept valve in FIG.

Hereinafter, with reference to the accompanying drawings will be described a turbine generator operating apparatus of a power plant according to an embodiment of the present invention.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a configuration diagram of a turbine generator operation apparatus of a power plant according to an embodiment of the present invention, Figure 2 is a view showing a state in which the main steam pressure and the reheat steam pressure to control the main control valve and the intercept valve in FIG. 3 is a view illustrating a state in which the main steam pressure and the reheat steam pressure are controlled by the main control valve and the intercept valve in FIG. 1.

1 to 3, the turbine generator operation apparatus of a power plant according to an embodiment of the present invention, the turbine unit 10, feed water pump 30, the first boiler 40, the first boiler 50 ), The main control valve 60, the intercept valve 70 and the controller 80.

The turbine unit 10 includes a high pressure steam turbine 12 into which high pressure steam is introduced, a medium pressure steam turbine 14 into which medium pressure steam is introduced, and a pressure steam turbine 18 into which low pressure steam is introduced.

The turbine unit 10 is driven by the high pressure steam turbine 12, the medium pressure steam turbine 14 and the low pressure steam turbine 16 is connected to one rotary shaft, the generator 18 is connected to produce a power. .

The rotating shaft is provided with a propeller to apply a force to the propeller by the injection pressure of the high pressure, medium pressure, low pressure steam supplied from the turbine unit 10 so that the rotating shaft rotates.

The feed water pump 30 supplies the steam discharged from the low pressure steam turbine 16 in a state in which the water condensed in the condenser 20 is increased to a high pressure.

The condenser 20 is a configuration corresponding to a condenser for condensing low-temperature, low-pressure steam from the low-pressure steam turbine 16 to restore water.

In the first boiler 40, water supplied from the feed water pump 30 flows into the first pipe line 42 to be converted into the main steam, and steam discharged from the high pressure steam turbine 12 is transferred to the second pipe line 44. Entered and converted to reheat steam.

The first boiler 40 includes a first main heating unit 46 and a first reheating unit 48.

In the first main heating unit 46, a first pipe line 42 is disposed to absorb main heat.

The first main heating unit 46 is called a main heater or a super heater.

The first reheater 48 provides a reheater to increase pressure and temperature by providing additional heat by using heat generated in the first boiler 40 to the steam discharged from the high-pressure steam turbine 12. , reheater).

The reheater is a device that reheats the steam expanded to a constant pressure in the steam turbine.

In this way, the first main heating unit 46 and the first reheating unit 48 are integrally formed.

In the second boiler 50, the water supplied from the feed water pump 30 flows into the third pipe line 52 to be converted into the main steam, and the steam discharged from the high pressure steam turbine 12 is transferred to the fourth pipe line 54. Entered and converted to reheat steam.

The second boiler 50 includes a second main heating unit 56 and a second reheating unit 58.

In the second main heating unit 56, a third conduit 52 is disposed to absorb the main heat.

The second main heating unit 56 is called a main heater or a super heater.

The second reheater 58 is a reheater that increases the pressure and temperature by providing additional heat by using heat generated in the second boiler 50 to the steam discharged from the high-pressure steam turbine 12 and discharged. , reheater).

A reheater is a device in which a steam turbine using very high pressure steam (about 100 atm or more) returns the steam during expansion back to the boiler and heats it with superheated steam from the boiler.

In this manner, the second main heating portion 56 and the second reheating portion 58 are integrally formed.

The main control valve 60 is installed in the fifth conduit 62 for supplying the main steam supplied through the first conduit 42 and the third conduit 52 to the high-pressure steam turbine 12 to regulate the supply.

The intercept valve 70 is installed in the sixth conduit 72 which supplies reheat steam supplied through the second conduit 44 and the fourth conduit 54 to the medium pressure steam turbine 14 to regulate supply.

The main control valve 60 and the intercept valve 70 are throttle valves for controlling the moving speed and the steam pressure of the steam by adjusting the opening amount of the pipe.

The controller 80 controls the main control valve 60 and the intercept valve 70 according to the pressure change of the main steam and the reheat steam in the fifth pipe 62 and the sixth pipe 72.

The main control valve 60 and the intercept valve 70 interlock with each other according to the pressure conversion of the main steam and the reheat steam.

The main control valve 60 and the intercept valve 70 are integrally provided with a function of sensing pressure, and the controller 80 receives the sensed pressure value and controls the interlock control between the main control valve 60 and the intercept valve 70. It is.

For example, the main control valve 60 and the intercept valve 70 may be integrally provided with a pressure gauge or a pressure sensor to sense the pressure. Of course, the pressure gauge or the pressure sensor may be provided in the fifth conduit 62 and the sixth conduit 72 out of the installation positions of the main control valve 60 and the intercept valve 70.

The pressure of the main steam moving in the fifth conduit 62 according to the throttling control of the controller 80 maintains 230 to 260 bar.

It is preferable to maintain about 246 bar.

In addition, the pressure of the reheat steam moving in the sixth conduit 72 according to the throttling control of the controller 80 maintains 45 to 55 bar.

It is preferable to maintain about 50bar.

At this time, the temperature of the main steam moving in the fifth pipe 62 and the temperature of the reheat steam moving in the sixth pipe 72 is maintained at 550 ~ 650 ℃, respectively.

Preferably it is good to maintain about 600 ℃.

Hereinafter, with reference to the accompanying drawings to look at the operation and effect of the turbine generator operation apparatus of a nuclear power plant according to an embodiment of the present invention.

As shown in FIG. 1, when the first and second boilers 40 and 50 are normally operated, steam discharged from the low pressure steam turbine 16 of the turbine unit 10 may be discharged from the condenser 20. Condensation is converted into water and flows into the feed water pump 30.

Subsequently, the first main heating portion 46 and the second boiler 50 of the first boiler 40 are converted to the high pressure water in the water supply pump 30 through the first pipe line 42 and the second pipe line 52. Are supplied to each of the second main heating portions 56 of the.

The steam converted to high temperature and high pressure in the first main heating unit 46 and the second main heating unit 56 passes through the fifth conduit 62 and is opened through valve throttle in the main control valve 60. In the adjusted state, the pressure is controlled and supplied to the high-pressure steam turbine 12 to rotate and drive the propeller.

The steam discharged in the expanded state in the high-pressure steam turbine 12 passes through the first reheating portion 48 of the first boiler 40 and the second reheating portion 58 of the second boiler 50. Reheated and expanded to move through the sixth pipe (72).

In addition, the steam moving through the sixth conduit 72 is supplied to the medium pressure steam turbine 14 in a full open state from the intercept valve 60 to provide rotational power to the propeller, and to pass through the low pressure steam turbine. After the 16, the condenser 20 is repeatedly cycled.

At this time, the intercept valve 60 maintains the pressure of the main steam moving in the fifth conduit 62 at 246 bar and the temperature of about 600 ° C., even though the intercept valve 60 does not perform throttling control, and reheat steam moving the sixth conduit 72. The pressure is 50bar, the temperature is maintained at 600 ℃.

Therefore, the main control valve 60 is throttling control in the control unit 70, the intercept valve 60 is to maintain the steam supply pressure even without interlocking control.

On the other hand, as shown in Figure 2, the main control valve 60 and the intercept valve 70 to look at the state that does not control the main steam pressure and reheat steam pressure, most of the state is the same as the normal state of Figure 1 will not be described Do not.

First, referring to the difference from FIG. 1, the main controller valve 60 is throttled and the intercept valve 60 is not throttled in the control unit 70 as in the normal state, but the failure of the second steam boiler 50 is performed. This shows that only the first boiler 20 is driven.

In this case, for convenience of description, the control unit 80 is displayed in a state in which the intercept valve 60 is connected, but in reality, the control unit 80 will be described as a state in which the intercept valve 60 does not operate.

At this time, since the intercept valve 70 is in a full open state, it is not possible to cope with the pressure change and to take measures to adjust the tube cross-sectional area of the first boiler 40 that is in operation in order to adjust the pressure. Eventually, for safety, the turbine unit 10 should be lowered and operated at 100MW or less.

That is, for example, in the case of a 1000MW class turbine generator, since 100MW is maintained, power generation is maintained at about 10% while repairing and repairing a malfunctioning boiler. will be.

And, as shown in Figure 3, when the main control valve 60 and the intercept valve 70 to look at the state of the integrated control of the main steam pressure and the reheat steam pressure, most of the state is the same as the normal state of FIG. I never do that.

First, referring to a difference from FIG. 2, in the controller 70, the main control valve 60 performs throttling control, and the intercept valve 60 also performs throttling control in conjunction with each other. It shows that only the first boiler 20 is driven due to the failure of the second steam boiler 50.

By adding a throttle function to the intercept valve 70 at the front end of the medium-pressure steam turbine 14, the main steam pressure of the fifth conduit 62 is controlled by the main control valve 60.

In addition, since the reheat steam pressure of the sixth conduit 72 is interlocked by interlocking with the intercept valve 70 according to the pressure situation, the two boilers are operated at the same pressure as the operation of the boiler. As it maintains 50% of output compared to normal operation, it can maintain the performance of equipment without changing boiler design.

That is, for example, in the case of a 1000MW class turbine generator, since it maintains about 500MW, it can maintain 50% of the power output while returning to the failed boiler by maintaining 50% of operation.

Turbine generator operating device of the power plant according to the present invention is operated by two boilers and one turbine unit, so even if one boiler fails, the remaining one boiler can be operated to minimize restart losses due to the stop of the power generation system. Can be.

In addition, the main steam valve and the reheat steam pressure are interlocked with each other according to the pressure change by using the main control valve installed in the pipeline connected to the high pressure steam turbine and the intercept valve installed in the pipeline connected to the medium pressure steam turbine. In this case, it can be operated without noticeable power loss.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10 turbine unit 12 high pressure steam turbine
14: medium pressure steam turbine 16: low pressure steam turbine
20: condenser 30: water supply pump
40: first boiler 42: first pipe
44: 2nd pipe line 46: 1st main heating part: 48: 1st reheating part 50: 1st boiler
52: 3rd pipeline 54: 4th pipeline
56: second main heating unit 58: second reheating unit
60: main control valve 62: fifth pipe
70: intercept valve 72: sixth pipeline
80: control unit

Claims (5)

A turbine unit having a high pressure steam turbine, a medium pressure steam turbine, and a low pressure steam turbine;
A water supply pump for supplying steam discharged from the low pressure steam turbine in a state in which the water condensed in the condenser is introduced and boosted;
A first boiler in which water from the feed water pump flows into the first pipe line and is converted into main steam, and steam discharged from the high pressure steam turbine flows into the second pipe line and converts into reheat steam;
A second boiler in which water from the feed water pump flows into a third pipe line and is converted into main steam, and steam discharged from the high pressure steam turbine flows into a fourth pipe line and converts into reheat steam;
A main control valve installed in a fifth conduit for supplying the main steam supplied through the first conduit and the third conduit to the high-pressure steam turbine;
An intercept valve installed in a sixth conduit for supplying the reheat steam supplied through the second conduit and the fourth conduit to the medium pressure steam turbine; And
And a control unit for controlling the main control valve and the intercept valve according to the pressure change of the main steam and the reheat steam in the fifth pipe line and the sixth pipe line.
The method of claim 1, wherein the first boiler
A first main heating unit arranged to absorb the main heat by the first pipe line; And
Turbine generator operating apparatus for a power plant characterized in that the second pipe is disposed to include a first reheating unit for absorbing the reheat.
The method of claim 1, wherein the second boiler
A second main heat unit configured to absorb the main heat by arranging the third conduit; And
Turbine generator operating apparatus for a power plant, characterized in that the fourth pipe is arranged to include a second reheating unit for absorbing the reheat.
The method of claim 1,
The main control valve and the intercept valve is a throttle valve (throttle valve) for controlling the moving speed and the steam pressure of the main steam and reheat steam by adjusting the opening amount of the pipeline.
The apparatus of claim 1, wherein the control unit
If any one of the first boiler or the second boiler is broken,
Interlocking control between the main control valve and the intercept valve,
The pressure of the main steam moving in the fifth pipe line according to the throttling control of the control unit maintains 230 ~ 260bar,
Turbine generator operating apparatus of a power plant characterized in that the pressure of the reheat steam moving the sixth pipe is maintained at 45 ~ 55bar.

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