KR101334687B1 - Main steam feeding device for generating system - Google Patents

Abstract

The present invention relates to a main steam feeding pipe apparatus of a power plant and includes: n boilers with output corresponding to one n^th of the set output of turbine, and a main steam pipe unit that is provided to have the temperature equilibrium of steam supplied to a turbine by bursting from the n boilers. In the present invention, unlike the prior art, each main steam pipe is connected to each of multiple boilers, and all the main steam pipes are connected to a cross over line, so that the remaining boiler main steam pipes can be heated at the time of operating any one of boilers, thereby reducing the temperature variation of steam flowing in different pipes from each other. [Reference numerals] (10) Turbine;(22,24) Boiler

Description

MAIN STEAM FEEDING DEVICE FOR GENERATING SYSTEM}

The present invention relates to a main steam supply piping device of the power plant, and more particularly, by connecting the main steam pipes for each of the plurality of boilers, and by connecting all the main steam pipes in a crossover line, the rest of any one boiler operation The present invention relates to a main steam supply piping device of a power plant that can preheat a boiler main steam pipe and reduce a temperature variation of steam flowing through different pipes.

The existing combined power generation system burns fuel to generate high-pressure, high-temperature combustion gas. At this time, the gas turbine system generates electricity by driving the gas turbine as the combustion gas, and the high temperature and high pressure as heat of the combustion gas discharged while driving the gas turbine. It is composed of a steam recovery steam generator for generating steam, and a steam turbine system for generating electricity by driving a steam turbine as steam generated in the steam recovery steam generator.

In particular, in a typical power plant, two main water supply pumps (50% capacity may be used) and one starting water supply pump having a capacity of 25% to 30% are often installed. The starting water supply pump is originally installed by means of a reserve or starting device.

A system for operating two turbines in one boiler has been proposed in Korean Patent Registration No. 10-0567907.

The existing power plant has a problem that the initial construction cost and maintenance cost of the piping is high because the main steam pipe of the high temperature and high pressure is long to connect the two boilers.

In addition, when the main steam supply piping device of the two-to-one method is connected to one in order to reduce the temperature deviation of the two main steam pipes, there is a problem in the large capacity power plant as a result of the pipe stress analysis.

Therefore, there is a need to improve this.

The present invention has been made in order to improve the above problems, the boilers are stopped at any one boiler operation only by connecting the main steam pipes for each of the plurality of boilers and connecting all the main steam pipes by crossover lines. It is an object of the present invention to provide a main steam supply piping device of a power plant that can preheat steam in a main steam pipe connected to the main steam pipe to reduce temperature variation of steam flowing through different pipes.

In addition, it is an object of the present invention to provide a main steam supply piping device of the power plant to reduce the piping construction cost as it can simplify the layout of the steam pipe.

The main steam supply piping device of the power plant according to the present invention is: n boilers having an output corresponding to 1 / n times the set output of the turbine, and the temperature balance of steam blown out of the n boilers supplied to the turbine It includes a main steam pipe portion provided to achieve.

The main steam pipe portion, a plurality of outlet pipes connected to each of the boiler to increase the amount of steam discharged from each boiler, crossover line for connecting the entire outlet pipe for pressure balance and heat balance, the crossover line And a plurality of connected steam pipes connected to each other to supply steam having a pressure and thermal balance to the turbine, and branched steam pipes branched from each of the connected steam pipes to stably supply steam to the turbine.

The outlet pipe may be provided with a main check valve and a main pressure control valve, respectively.

The connection steam pipes may be connected to each other by a pressure balance line.

The connected steam pipe may include a main stop valve for adjusting the flow rate and a control valve for adjusting the pressure, and the branch steam pipe may include the control valve.

The crossover line may be provided as the number of the boiler by pairing the sub check valve and the sub pressure control valve in order to control the steam before being supplied to the connection steam pipe.

As described above, the main steam supply piping device of the power plant according to the present invention, unlike the prior art, respectively connecting the main steam pipes for each of the plurality of boilers, and all the main steam pipes by crossover line to each other only one Even in the operation of the boiler, it is possible to preheat steam in the main steam pipe connected to the stopped boiler, thereby reducing the temperature variation of the steam flowing through different pipes.

In addition, the present invention can simplify the layout of the steam pipe can reduce the pipe construction cost.

1 is a configuration diagram of a main steam supply piping device of a power plant according to an embodiment of the present invention.
2 is a configuration diagram of a main steam supply piping device of a power plant according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the main steam supply piping device of the power plant according to 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 this specification.

1 is a configuration diagram of a main steam supply piping device of a power plant according to an embodiment of the present invention, Figure 2 is a configuration diagram of a main steam supply piping device of a power plant according to another embodiment of the present invention.

Referring to Figure 1, the main steam supply piping device of the power plant according to an embodiment of the present invention comprises a boiler (22, 24), and the main steam pipe 100.

In particular, a plurality of boilers 22 and 24 are provided and connected to a water supply storage tank (not shown), each of which supplies water.

And, the main steam pipe 100 to maintain the temperature equilibrium of the steam is ejected from the plurality of boilers 22, 24 and supplied to the turbine 10, the other one when the boiler 22 is stopped operating It serves to preheat the steam ejected from the boiler 22 stopped by the hot steam ejected from the boiler 24.

In this case, the plurality of boilers 22 and 24 are connected to one turbine 10.

Here, the turbines 10 and 10 have a set output, and each of the boilers 22 or 24 among the n boilers 22 and 24 is 1 / n times the output of the turbine 10.

This is to shorten the starting time of each boiler 22 and 24 and the turbine 10 by starting n boilers 22 and 24 simultaneously and starting one turbine 10, and to realize the equipment operation economically. to be.

The reason why the outputs of the boilers 22 and 24 are equal to 1 / n is to maintain or improve the durability of the turbine 10 by making the outputs simultaneously supplied to the turbine 10 the same.

For convenience, the boilers 22, 24 are shown as consisting of a first boiler 22 and a second boiler 24.

In addition, the main steam pipe 100 is provided to achieve a temperature balance of the steam is ejected from the first boiler 22 and the second boiler 24 is supplied to one turbine (10).

For example, the main steam pipe part 100 includes an outlet pipe 102, 104, 106, 108, a crossover line 110, a connected steam pipe 122, 124, a pressure balance line 130, and a branch steam pipe 142, 144.

A plurality of outlet pipes 102 to 108 are connected to the first boiler 22 and the second boiler 24, respectively. For convenience, the outlet pipes 102 to 108 are connected to the first outlet pipe 102 and the second outlet pipe 104 and the second outlet pipe 24 connected to the first boiler 22. ) And the fourth outlet pipe 108.

Particularly, the reason why the first outlet pipe 102 and the second outlet pipe 104 are connected to the first boiler 22 at the same time is to ensure the maximum amount of steam generated in the first boiler 22. . Similarly, the reason why the third outlet pipe 106 and the fourth outlet pipe 108 are connected to the second boiler 24 at the same time is to ensure the maximum amount of steam generated in the second boiler 24. . Of course, the number of outlet pipes 102 to 108 is not limited.

In addition, the crossover line 110 connects the entire outlet pipes 102 to 108 to maintain the pressure of the steam flowing through all the outlet pipes 102 to 108 in an equilibrium state, and maintains the heat in an equilibrium state. Do it.

That is, steam flowing through the first outlet pipe 102, steam flowing through the second outlet pipe 104, steam flowing through the third outlet pipe 106 and the fourth outlet pipe 108 are provided. The flowing steam is supplied to the crossover line 110 to be mixed with each other and to be in equilibrium.

Thus, as the steam generated from the first boiler 22 and the second boiler 24 is mixed in the crossover line 110 before being supplied to one turbine 10, only the first boiler 22 or When only the second boiler 24 is running, the steam inside the outlet piping 102, 104 or 106, 108 connected to the stationary boiler is preheated by thermal equilibrium.

On the other hand, the connection steam pipe (122, 124) is connected to a plurality of crossover lines 110 serves to directly supply steam to form a pressure and thermal balance to one turbine (10).

In particular, the reason why the plurality of connection steam pipes 122 and 124 are connected to the crossover line 110 is that the steam flowing through the plurality of outlet pipes 102 to 108 is collected in one crossover line 110. This is to smoothly supply the steam from the crossover line 110 to the turbine 10 so as to smoothly eject the steam from each of the boilers 22 and 24.

For convenience, the connected steam pipes 122 and 124 are shown as being composed of a first connected steam pipe 122 and a second connected steam pipe 124. Of course, the number of connected steam pipes 122 and 124 is not limited.

In addition, branched steam pipes 142 and 144 are branched from each of the first connected steam pipe 122 and the second connected steam pipe 124 to provide more stable supply of steam to the turbine 10.

For convenience, the first connection steam pipe 122 is branched to the first branch steam pipe 142, the second connection steam pipe 124 shows that the second branch steam pipe 144 is branched.

Accordingly, the steam combined into the crossover line 110 is transferred through the plurality of connection steam pipes 122 and 124 and the branch steam pipes 142 and 144, thereby allowing the steam to flow through the plurality of outlet pipes 102 to 108. May be smoothly supplied to the crossover line 110 without a pulsation phenomenon.

In particular, the first connection steam pipe 122 and the second connection steam pipe 124 is connected to the pressure balance line (130). Thus, the pressure of the steam which is divided into the first connection steam pipe 122 and the second connection steam pipe 124 from the crossover line 110 is balanced again.

On the other hand, the first outlet pipe 102, the second outlet pipe 104, the third outlet pipe 106 and the fourth outlet pipe 108 from the corresponding first boiler 22 and the second boiler 24 It is desirable to prevent backflow of the vapor that is blown out.

Thus, the first outlet pipe 102, the second outlet pipe 104, the third outlet pipe 106 and the fourth outlet pipe 108 is preferably provided with a main check valve 162, respectively.

In addition, the first outlet pipe 102, the second outlet pipe 104, the third outlet pipe 106 and the fourth outlet pipe 108 are ejected from the first boiler 22 and the second boiler 24. The pressure of the steam may vary. Accordingly, the pressure of the steam flowing to the crossover line 110 is preferably adjusted to be uniform.

Therefore, the first outlet pipe 102, the second outlet pipe 104, the third outlet pipe 106 and the fourth outlet pipe 108 is preferably provided with a main pressure control valve 164, respectively.

In addition, the steam flowing through the first connection steam pipe 122, the second connection steam pipe 124, the first branch steam pipe 142 and the second branch steam pipe 144 are all supplied to the turbine 10. do. At this time, the flow amount of each of the first connected steam pipe 122, the second connected steam pipe 124, the first branch steam pipe 142 and the second branch steam pipe 144, which is supplied to the turbine 10 is again It is preferred to be controlled to be adjusted.

Thus, the first connection steam pipe 122, the second connection steam pipe 124 is provided with a flow rate control main stop valve (MSV, 172) and pressure control control valve (CV, 174), the first branch steam pipe ( 142 and the second branch steam pipe 144 is provided with a pressure control control valve (CV, 174).

In particular, the first outlet pipe 102 and the second outlet pipe 104 connected from the first boiler 22 are connected to the third outlet pipe 106 and the fourth outlet pipe 108 from the second boiler 24. Compared to the existing one that is arranged to cross), the first outlet pipe 102, the second outlet pipe 104, the third outlet pipe 106 and the fourth outlet pipe 108 is one crossover line 110 As a result, the pipe layout can be simplified.

On the other hand, referring to Figure 2, the main steam supply piping device of the power plant according to another embodiment of the present invention comprises a boiler (22, 24), and the main steam pipe 100, the main steam pipe Reference numeral 100 includes a first outlet pipe 102, a second outlet pipe 104, a third outlet pipe 106 and a fourth outlet pipe 108.

In particular, the first outlet pipe 102, the second outlet pipe 104, the third outlet pipe 106 and the fourth outlet pipe 108 are connected to one crossover line 110.

In addition, the first outlet pipe 102 and the second outlet pipe 104 are connected to one side of the crossover line 110 in a state where the third outlet pipe 106 and the fourth outlet pipe 108 are combined. It is connected to the other side of the crossover line 110 in a state.

It is preferable to allow the steam of different boilers 22 and 24 supplied to both sides of the crossover line 110 to flow inward along the axial direction of the crossover line 110 without backflowing. In addition, it is possible to allow the steam of different boilers 22 and 24 supplied to both sides of the crossover line 110 to flow inward along the axial direction of the crossover line 110 under repeated pressure control. desirable.

Accordingly, the sub check valve 166 and the sub pressure regulating valve 168 are provided at both sides of the crossover line 110, respectively.

That is, the first main steam pipe 102 and the second main steam pipe 104 are combined and connected to the crossover line 110, and the sub check valve 166 and the sub pressure control valve 168 are connected to this connection part. Disposed close to.

The third main steam pipe 106 and the fourth main steam pipe 108 are combined with the crossover line 110, and the sub check valve 166 and the sub pressure regulating valve 168 are connected to the connecting portion. Disposed close to.

Thus, as soon as the steam conveyed from each of the main steam pipes 102, 104, 106 and 108 passes through the sub check valve 168 and the sub pressure control valve 168 as soon as it is moved to the crossover line 110 and the first connection steam pipe 122 and Branch conveyed to the second connection steam pipe (124).

At this time, the main check valve 162 provided in the first outlet pipe 102, the second outlet pipe 104, the third outlet pipe 106 and the fourth outlet pipe 108 according to the first embodiment; The main pressure control valve 164 is not necessary. Thus, the number of valves can be reduced.

The reference numerals not described are replaced with those described above.

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 22: first boiler
24: second boiler 100: main steam pipe
102, 104, 106, 108: 1, 2, 3, 4 outlet piping
110: crossover line 122,124: first and second connection steam piping
130: pressure balance line 142,144: first and second quarter steam piping
162: main check valve 164: main pressure control valve
172: main stop valve (MSV) 174: control valve (CV)

Claims (6)

N boilers having an output corresponding to 1 / n times the set output of the turbine; And
It includes a main steam pipe which is provided to achieve a temperature balance of the steam emitted from the n boilers supplied to the turbine,
The main steam pipe portion, the outlet pipe for connecting a plurality of the boiler to increase the amount of steam emitted from each boiler;
A crossover line connecting the entire outlet pipe for pressure balance and heat balance;
A plurality of connected steam pipes connected to the plurality of crossover lines and configured to supply steam, which is in thermal equilibrium with pressure, to the turbine; And
And a branch steam pipe branched from each of the connected steam pipes to stably supply steam to the turbine.
delete The method of claim 1,
The outlet pipe is the main steam supply piping device of the power plant, characterized in that each having a main check valve and the main pressure control valve.
The method according to claim 1 or 3,
The connection steam pipes are the main steam supply piping device of the power plant, characterized in that connected to each other by a pressure balance line.
The method according to claim 1 or 3,
The connected steam pipe is provided with a flow rate main stop valve, a pressure control control valve,
The branch steam pipe is the main steam supply piping device of the power plant, characterized in that provided with the control valve.
The method of claim 1,
The crossover line is provided with as many as the number of the boiler in a pair of sub-check valve and a sub-pressure control valve to control the steam before the supply to the connection steam pipe, the main steam supply of the power plant Piping system.

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