KR101933883B1 - Gas turbine generating apparatus and startup operating method of the same - Google Patents

Abstract

The present invention relates to a gas turbine power generator, and more particularly, to a gas turbine generator that includes a gas turbine, a vaporizer for vaporizing the liquefied fuel flowing into the gas turbine, a steam generator for generating steam from the exhaust heat of the gas turbine as a heat source, A seawater supply line connected to the first heat exchanger and a seawater supply pump are installed in the first heat exchanger, and the seawater supply pump is installed in the first heat exchanger, A first seawater supply pipe including a plurality of seawater supply pump lines connected to the supply line, and a second seawater supply pipe connecting the first heat exchanger and the vaporizer.

Description

TECHNICAL FIELD [0001] The present invention relates to a gas turbine generator and a start-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine power generation apparatus and a start-up driving method thereof, and more particularly, to an apparatus and a method for efficiently supplying required seawater corresponding to a heat amount supplied during initial operation of the entire system.

The offshore structure including the ship is provided with various power generation devices for the production of the power required for the operation of the offshore structure.

In recent years, there have been cases where the power generation system itself is installed on the offshore structure, and accordingly, when the power supply to the corresponding region is not provided due to a disaster or the like, or in various forms The concept of the power lines of the power line is proposed.

Such ships may have various types of power generation facilities. However, recently, there has been proposed a gas turbine power generation apparatus that is configured to recover waste heat generated from gas turbine power generation and gas turbine power generation using liquefied natural gas as the main fuel, Is widely used.

In addition, it is common to use seawater that can be easily secured according to the sea structure as a heat source necessary for driving the entire system.

A plurality of seawater supply pumps are provided for the supply of seawater, and a heat source is secured by driving pumps corresponding to the required amount.

However, in the conventional gas turbine generator, there are few cases in which the system is designed in consideration of special operation conditions, for example, initial operation of the gas turbine generator, according to the design considering normal operation.

Accordingly, there is a problem that unnecessary operation of the seawater pump or unnecessary flow of the inflowing seawater occurs.

Korean Patent Publication No. 10-2016-0046144

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a seawater supply pump and a flow line capable of effectively vaporizing only fuel required for initial operation of a gas turbine power generator.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided a gas turbine power generation system including a gas turbine, a vaporizer for vaporizing the liquefied fuel flowing into the gas turbine, a steam generator for generating steam from the exhaust heat of the gas turbine, A first heat exchanger for exchanging heat between the fluid discharged from the steam turbine and the seawater, a seawater supply line connected to the first heat exchanger, a seawater supply line connected to the first heat exchanger, A first seawater supply pipe including a plurality of seawater supply pump lines installed with a pump and connected to the seawater supply line, and a second seawater supply pipe connecting the first heat exchanger and the vaporizer.

Wherein the seawater supply pump includes a start-up pump, one end is connected to a point where the sea water supply pump line of the start-up pump meets the first seawater supply line, and the other end is connected to a start- And may further include a pass pipe.

And a start-up valve for selecting the flow of seawater supplied from the start-up pump to the start-up bypass piping and the first seawater supply line.

The gas turbine power plant start-up drive method of the present invention includes a start-up pump driving step for driving at least one of a plurality of seawater pumps, a start-up fuel supply for supplying a predetermined amount of liquefied fuel for driving the gas turbine to the vaporizer And a start-up vaporization step of supplying seawater supplied through the start-up pump to the vaporizer to vaporize the liquefied fuel.

A turbine generating step of driving the turbine using the liquefied gas vaporized in the start-up vaporization step, a steam generating step of generating steam by using exhaust gas generated in the turbine, a steam generating step of driving the steam turbine by using the steam, And a steam cooling step of cooling the fluid discharged from the steam turbine using a part of the plurality of seawater pumps.

In addition, it is also possible to increase the number of operations of the plurality of seawater pumps by increasing the number of the seawater pumps, increasing the number of the seawater pumps, increasing the number of the seawater pumps, increasing the number of the seawater pumps, And a step of increasing the operation of the seawater pump.

And a start-up seawater pump channel switching step of switching the channel of the start-up pump so that the sea water supplied by the start-up pump cools the fluid discharged from the steam turbine.

The gas turbine power generation apparatus and start-up drive method of the present invention have the following effects.

First, the operation of the gas turbine power generation system is divided into a start-up operation and a normal operation, and the amount of seawater necessary for the liquefied fuel supplied according to each operation can be supplied. Therefore, there is an advantage that unnecessary operation of the seawater pump and thus ineffective flow can be blocked.

Second, a simple design change is made to the existing gas turbine power generation system without bypassing the design of the system, bypass piping connecting one of a plurality of seawater supply pumps and the vaporizer in the maintained state, and valves for flow control It is possible to implement the first effect.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a gas turbine generator according to an embodiment of the present invention; FIG.
2 is a view showing a flow of seawater during start-up driving of a gas turbine power generation apparatus according to an embodiment of the present invention;
3 is a view showing the flow of seawater in a steady-state operation of a gas turbine power generation apparatus according to an embodiment of the present invention;
4 is a flow diagram illustrating a gas turbine operating method according to an embodiment of the present invention;
5 is a flowchart illustrating a start-up operation process in a gas turbine operating method according to an embodiment of the present invention;
6 is a flowchart showing a flow path switching operation process according to an embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

Moreover, in describing the present invention, terms indicating a direction such as forward / rearward or upward / downward are described in order that a person skilled in the art can clearly understand the present invention, and the directions indicate relative directions, It is not limited.

FIG. 1 is a view showing a schematic configuration of a gas turbine power generator according to an embodiment of the present invention, and FIG. 2 is a view showing the flow of seawater during start-up driving of a gas turbine power generator according to an embodiment of the present invention And FIG. 3 is a view showing the flow of seawater in the normal operation of the gas turbine generator according to the embodiment of the present invention.

1 to 3, the gas turbine power generation apparatus of the present invention includes a gas turbine 10 and a steam turbine 40 for recovering waste heat of the exhaust gas generated in the gas turbine 10. The heat source for cooling and circulating the steam discharged from the steam turbine (40) and the heat source for vaporizing the liquefied fuel flowing into the gas turbine (10) are used.

Specifically, the gas turbine generator of the present invention includes a gas turbine 10, a vaporizer 20, a steam generator 30, a steam turbine 40, a first heat exchanger 50, a first seawater supply pipe 60, And a second sea water supply pipe (70).

The gas turbine 10 is driven by the supplied fuel and generates electricity. The exhaust gas from the burned fuel passes through the steam generator 30 to be described later, and heat is recovered while vaporizing the introduced fluid.

The vaporizer 20 vaporizes the liquefied fuel flowing into the gas turbine 10. Here, various liquefied fuels may be used as the liquefied fuel, but in the present embodiment, liquefied natural gas (LNG) will be used as a reference.

In the present invention, the second seawater supply pipe 70, which will be described later, is connected to the carburetor 20, and the seawater flowing through the second seawater supply pipe 70 is connected to the carburetor 20, Thereby vaporizing the liquefied fuel.

On the other hand, the fuel flowing into the vaporizer 20 can be supplied in various ways, and in this embodiment includes the liquid line 21 and the BOG line 22 connected to the LNG cargo hold. The BOG line 22 may be provided with a compressor 23 for pressurizing the flowing BOG and the liquid line 21 and the BOG line 22 are connected to a re-condenser 24.

The liquefied fuel condensed in the recondenser (24) is then pressurized through the high-pressure pump (25) and introduced into the carburetor (20). On the other hand, in the present embodiment, a part of the liquefied fuel pressurized by the high-pressure pump 25 can be designed to be introduced into the recondenser 24 through the recovery line 26. [

The steam generator 30 drives the gas turbine 10, absorbs exhaust heat to be discharged, and evaporates the fluid through absorbed heat to generate steam. The steam generated in the steam generator 30 flows to the steam turbine 40, and the steam generator 40 is driven to generate electric power.

The first heat exchanger (50) performs heat exchange between the discharged fluid and seawater after power generation by the steam turbine (40). The first heat exchanger (50) is connected to a first seawater supply pipe (60) to which seawater is supplied.

The first seawater supply pipe 60 is connected to the seawater supply line 63 and the seawater supply line 63 connected to the first heat exchanger 50 and the sea water supply line 63 connected to the first heat exchanger 50, And a plurality of seawater supply pump lines 62 in which a plurality of seawater supply pumps 61 are installed. Accordingly, it is possible to variably supply the required amount of seawater according to the change of the exhaust heat amount according to the power generation amount of the gas turbine 10.

The adjustment of the amount of the supplied seawater can be determined depending on whether each seawater supply pump 61 is driven or can be adjusted by a valve for opening and closing the seawater supply pump line 62 separately.

The second seawater supply pipe 70 connects the first heat exchanger 50 and the vaporizer 20 to each other. The heated seawater flows through the second seawater supply pipe 70 to the vaporizer 20 and vaporizes the liquefied fuel in the vaporizer 20 as the heat exchanges with the steam in the first heat exchanger 50.

That is, the gas turbine power generation apparatus of the present invention is provided with a gas turbine 10 and a steam turbine 40 for recovering the waste heat of the gas turbine 10. The seawater is used to sequentially cool the fluid discharged from the steam turbine (40) and the liquefied fuel flowing into the gas turbine (10).

On the other hand, when the apparatus is initially driven, the gas turbine 10 is driven with a predetermined amount of liquefied fuel required for the initial drive, and then the fuel injection amount is increased in order to reach the amount of liquefied fuel suited to the total power generation capacity.

Accordingly, a predetermined amount of liquefied fuel is injected into the vaporizer 20 at the time of initial driving, and the amount of heat for vaporizing the liquefied fuel is required to be relatively small as compared with the case of performing normal power generation operation.

As a result, a smaller amount of seawater is required at the initial start-up than during normal power generation operation. Accordingly, in the present invention, a plurality of seawater supply pump pipes 62 and respective pipes are provided with a seawater supply pump 61, and each seawater supply pump pipe 61 is selectively shielded. Therefore, it is possible to drive only the pump corresponding to the necessary amount of seawater without driving all the pumps 70 unnecessarily in the initial operation.

On the other hand, when the initial seawater flows into the carburetor at the initial start-up, the exhaust gas is not generated before the gas turbine 10 starts generating electricity. Therefore, a heat source for driving the steam turbine 40 is not generated. In this case, since heat exchange is not required in the first heat exchanger 50, it is effective to directly flow seawater into the vaporizer 20.

Accordingly, any one of the plurality of seawater supply pumps is defined as the start-up pump 61a, and the first start-up pump 61a is connected to the first seawater supply line 63 at the point where the seawater supply pump line 62a and the first seawater supply line 63 meet And a start-up bypass pipe (80) to which the other end is connected to the second seawater supply pipe (70).

As a result, the first heat exchanger 40, in which heat exchange does not occur during the initial start-up operation, does not generate unnecessary flow of seawater, and only seawater of a calorific quantity for vaporizing only the liquefied fuel flowing into the vaporizer 20 at the initial start- 20). ≪ / RTI >

The present invention may include a start-up valve for selecting the flow of the seawater supplied from the start-up pump 61a to the start-up bypass pipe 80 and the first seawater supply line 63.

The start-up valve may be provided with a three-way valve at the point where the start-up bypass pipe 80, the first seawater supply line 63, and the seawater pump supply line 62a where the start-up pump 61a is installed, In this embodiment, separate valves 81a and 63a are provided in the start-up bypass pipe 80 and the seawater pump supply line 62a, respectively.

The valve 80a provided in the start-up bypass pipe 80 is shut off and the valve installed in the seawater pump supply line 62a is opened so that the seawater supplied to the start-up pump 61a Flows into the first heat exchanger 50 through the first seawater supply line 63 together with seawater supplied from another seawater supply pump 61 and then flows to the vaporizer 20 through the second seawater supply pipe 70 .

The present invention further includes a second heat exchanger (90) for cooling the air introduced into the gas turbine (10) in order to increase the efficiency of the gas turbine (10). In this embodiment, the cooled seawater is supplied to the second heat exchanger (90) while vaporizing the liquefied fuel in the vaporizer (20) while cooling the intake air .

The apparatus may further include a heater 100 for once again heating the vaporized fuel in the vaporizer 20 before introduction of the gas turbine for efficient combustion in the gas turbine 10. Various heat sources can be used as a heat source for heating. In this embodiment, the steam generator 30 can be designed to heat by using a heat source of steam heated by exhaust heat.

As described above, the overall configuration of the gas turbine generator of the present invention has been described, and the operation method of the gas turbine generator of the present invention at the start-up will be described below.

FIG. 4 is a flowchart showing a gas turbine operating method according to an embodiment of the present invention. FIG. 5 is a flowchart showing a start-up operation process in a gas turbine operating method according to a temporal example of the present invention. Fig. 8 is a flowchart showing a flow path switching operation process according to an example.

4 to 6, the gas turbine power plant start-up operation method of the present invention includes a start-up operation step S10, a flow path switching operation step S20, and a normal operation step S30.

The start-up operation step S10 is a step of initializing the gas turbine power generation apparatus. The start-up pump drive step S11, the start-up fuel supply step S12, the start up vaporization step S13, the turbine power generation step S14 ), A steam generating step S15, a steam generating step S16, and a steam cooling step S17.

In the start-up pump driving step S11, at least a part of the plurality of seawater supply pumps 61 is driven, and the start-up fuel supply step S12 is a step of supplying a predetermined amount of liquefied fuel To the vaporizer. In the start-up vaporization step S13, seawater supplied through the start-up pump 61a is supplied to the vaporizer to vaporize the liquefied fuel.

That is, the gas turbine 10 is first driven by using the minimum amount of liquefied fuel necessary for the initial operation of the gas turbine power generation apparatus and the corresponding heat of vaporization. For this purpose, the seawater corresponding to the heat source for the initial vaporization, as described in the overall constitution of the present invention, includes at least a part of a plurality of seawater supply tanks 61 connected to the seawater tank supply line 62, the first seawater supply line 63 ), The first heat exchanger 50 (heat exchange is not performed because it is before the steam power generation), and the second seawater supply pipe 70 to the vaporizer 20.

The start-up pump 61a, the start-up pump line 62a, and the start-up pump 62a, which are defined as any one of the plurality of seawater supply pumps 61, do not flow unnecessarily to the first heat exchanger 50, It may flow to the vaporizer 20 through the pass piping 80 and the second seawater supply line 70.

In the gas turbine power generation step S14, the gas turbine 10 is driven by the vaporized fuel while the vaporizer is talking, and power generation is performed. Exhaust gas is generated by the driving of the gas turbine 10 and heat exchange is performed between the exhaust gas and the fluid through the steam turbine generator 30 in the steam generating step S15 for recovering exhaust heat, And steam is generated.

In step S16, steam is generated from the steam turbine generator 30 and the steam is driven by the steam turbine 40. The discharged fluid is cooled through the first heat exchanger 50 Cooling step S17), and then flows back into the steam turbine generator 30 to be circulated.

In the steam cooling step S17, a seawater supply pump 61 other than the start-up pump 61a is driven to flow into the first heat exchanger 50 through the first seawater supply line 63 to cool the steam .

The flow path switching operation step S20 includes the step of switching the source of heat of vaporization S21, the step of increasing the supply fuel S22, the step of increasing the operation of the sea water supply pump S23 and the step S24 of switching the start-up seawater pump channel.

In the heat source conversion step S21, the sea water that has cooled the steam in the first heat exchanger 50 flows to the vaporizer 20 through the second sea water supply pipe 70.

In this case, the seawater discharged from the start-up pump 61a and the seawater discharged from the first heat exchanger 50 can be supplied to the vaporizer 20, and when the flow of the start-up pump 61a is blocked, Only the seawater discharged from the heat exchanger 50 may be supplied.

This step is a state in which both the gas turbine 10 and the steam turbine 40 of the present invention are in a state in which they are being driven and the amount of heat to be supplied to the vaporizer 20 is greater than the amount of heat for vaporizing the initially predetermined liquefied fuel A supply fuel increasing step S22 for increasing the fuel supplied to the vaporizer 20 may be performed.

The amount of the exhaust gas generated in the gas turbine 10 is increased as the fuel supplied sequentially in the supply fuel increasing step S22 is increased and eventually the seawater supply pump 61 is provided to supply sufficient heat to the entire system, (S23) may be performed to increase the number of driving of the water pump.

On the other hand, the start-up pump 61a is defined as any one of a plurality of seawater supply pumps 61, the entire system is driven, and sufficient seawater having passed through the first heat exchanger 50 is supplied to the vaporizer 10 The need to flow to the vaporizer 20 through the direct start-up bypass piping 80 is reduced.

Therefore, in the start-up seawater pump channel switching step S24, the valve 80a provided in the start-up bypass pipe 80 is shut off, and the valve provided in the seawater pump supply line 62a is opened. That is, the seawater supplied from all the sea water supply pumps 61 sequentially flows through the first heat exchanger 50 and the vaporizer 20, and then the second heat exchanger 90 cools the gas turbine 10 intake air And then a normal operation process (S30) is performed.

As a result, according to the gas turbine generator start-up method of the present invention, all the seawater supply pumps 61 are unnecessarily driven at the start-up of the gas turbine power generation equipment, or the seawater introduced through the seawater supply pump 61 flows through an unnecessary path And the amount set in the vaporizer 20 necessary for start-up driving is provided in the shortest path. .

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10: gas turbine 20: vaporizer
30: Steam generator 40: Steam turbine
50: steam cooler 60: first seawater supply pipe
70: Second seawater supply piping 80: Start-up bypass piping
90: second heat exchanger 100: heater

Claims (7)

Gas turbines;
A vaporizer for vaporizing the liquefied fuel flowing into the gas turbine;
A steam generator for generating steam by using the heat of exhaust of the gas turbine as a heat source;
A steam turbine driven by the steam generated by the steam generator;
A first heat exchanger for exchanging heat between the fluid discharged from the steam turbine and seawater;
A first seawater supply line including a seawater supply line connected to the first heat exchanger and a plurality of seawater supply pumps installed in the first heat exchanger and a plurality of seawater supply pump lines connected to the seawater supply line, pipe; And
A second seawater supply pipe connecting the first heat exchanger and the vaporizer;
/ RTI >
Wherein the seawater supply pump includes a start-up pump,
A start-up bypass pipe connected to a point where the sea water supply pump line and the first sea water supply line of the start-up pump meet, and the other end is connected to a second sea water supply pipe;
Wherein the gas turbine generator further comprises: delete The method according to claim 1,
And a start-up valve for selecting the flow of seawater supplied from the start-up pump to the start-up bypass piping and the first seawater supply line. A start-up drive method for a gas turbine generator using the gas turbine generator according to claim 1,
A start-up pump driving step of driving at least one of a plurality of sea water supply pumps;
A start-up fuel supply step of supplying a predetermined amount of liquefied fuel for driving the gas turbine to the vaporizer; And
A start-up vaporization step of supplying seawater supplied through the start-up pump to the vaporizer to vaporize the liquefied fuel;
Wherein the gas turbine power generation start-up drive method comprises: 5. The method of claim 4,
A turbine power generation step of driving the turbine using the liquefied gas vaporized in the start-up vaporization step;
A steam generating step of generating steam by using exhaust gas generated from a turbine;
A steam generator for generating steam by driving the steam turbine using the steam;
A steam cooling step of cooling the fluid discharged from the steam turbine using a part of the plurality of seawater supply pumps;
Further comprising the steps of: 6. The method of claim 5,
A vaporizing heat source switching step of vaporizing the liquefied fuel supplied to the gas turbine using the sea water cooled by the steam;
A supply fuel increasing step of increasing a fuel for driving the gas turbine;
A drive increasing step of increasing the drive of the plurality of sea water supply pumps;
Further comprising the steps of: The method according to claim 6,
A flow path switching step of switching the flow path of the start-up pump so that the sea water supplied by the start-up pump cools the fluid discharged from the steam turbine;
Further comprising the steps of:

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