JPH1113480A - Starting method for compressor in compressed air storage powder generating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starting method that allows the drive and rotation of a compressor without setting up any starting equipment such as a starting motor and a thyristor or the like, in a compressed air storage power generating system. SOLUTION: Two clutches 2 and 3 at both sides of a motor generator 1 is made into a state of being connected to each other, and storage compressed air and fuel both are fed to gas turbines 4 and 5 from a cavity 15 and the gas turbines 4 and 5 are started to build up them up to the rated speed, thereby synchronizing the motor generator. Subsequently, the clutch 3 at the side of the gas turbines 4 and 5 is removed away and compressors 6 to 8 are rotated by the motor generator 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving a compressor with a motor generator to compress and store air when power demand is small, and burning fuel using the stored compressed air when power demand is low. The present invention relates to a method for starting a compressed air storage power generation system (CAES) configured to drive a gas turbine to generate power.

[0002]

2. Description of the Related Art A compressed air storage power generation system is a power generation system that has been considered for power generation load leveling, and its basic configuration is shown in FIG. In FIG. 7, reference numeral 20 denotes a motor generator serving as both a generator and a motor.

A motor generator 20 has a compressor 23 and a gas turbine 2 via clutches 21 and 22 on both sides, respectively.
6 are installed. The gas turbine 26 is shown as having two stages, a high pressure stage HP and a low pressure stage LP.
Reference numeral 5 denotes a combustor.

[0004] Reference numeral 24 denotes a cavity for storing the air pressurized by the compressor 23, and reference numeral 27 denotes a regenerator as a heat exchanger for recovering exhaust heat of the gas turbine 26.

In the compressed air storage and power generation system having the above configuration, clutches 21 and 22 are provided on both sides of the motor generator 20, and when the clutch is turned on / off, the compressor 23 is charged with compressed air. , Gas turbine 2
6 is generating power.

That is, when the power demand is small (at night), the motor generator 20 is driven by electric power as a motor to drive the compressor 2.
Activate 3 to compress the air and store it in cavity 24 or tank.

When the compressed air is filled, the clutch 21 is turned on and the clutch 22 is turned off, and the compressor 23 is driven by the motor generator 20 to store the compressed air in the underground cavity 24.

On the other hand, during power demand (daytime), the compressed air stored as described above is taken out to drive the gas turbine,
The motor generator 20 is driven as a generator to generate power.

At the time of power generation, the clutch 21 is turned off, the clutch 22 is turned on, compressed air is supplied from the underground cavity 24, fuel is sent to the combustor 25, ignition is performed, the gas turbine is turned, and power is generated by the motor generator 20. To make it happen.

[0010]

In the compressed air storage and power generation system, it is necessary to install a starting device such as a torque converter, a starting motor or a thyristor in order to start the compressor. This is because the motor generator is of a synchronous type and requires an external input.

In a compressed air storage and power generation system, if a starting device is installed in addition to a gas turbine, a motor generator, a compressor, and the like, the equipment configuration becomes complicated, and the operation becomes complicated, so that the reliability of the system decreases. There are concerns.

The present invention has been made to solve this problem, and a starting method for starting a compressor without installing a starting device such as a starting motor or a thyristor in a compressed air storage and power generation system. The challenge is to provide

[0013]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problem by utilizing an air storage source. The clutches on both sides of a motor generator are turned on to supply compressed air and fuel to a gas turbine. A method for starting a compressor is provided, in which a gas turbine is started by feeding and igniting to start up to a rated rotation speed, then a clutch on a gas turbine side is disconnected and the compressor is rotated by a motor generator.

In the compressed air storage power generation system, a motor generator having both functions of a motor and a generator is employed. The motor generator is of a synchronous type due to its characteristics. Unlike an induction type used in a small gas turbine, power cannot be taken out unless an external force is applied to start up to a rated speed.

According to the starting method of the present invention, the compressed air and the fuel can be sent to the gas turbine using the compressed air source in the compressed air storage power generation system, ignited, and the gas turbine can be started up to the rated speed.

When the gas turbine reaches the rated speed, the clutch on the gas turbine side is disengaged and the compressor is rotated by the motor generator. As described above, according to the present invention, the compressor can be started without installing a dedicated starting device for starting the compressor.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to FIGS. First,
The configuration of the compressed air storage and power generation system shown in FIG. 1 will be described. In FIG. 1, reference numeral 1 denotes a motor generator.

On both sides of the motor generator 1, a compressor comprising a first stage compressor 6, a second stage compressor 7 and a third stage compressor 8 via clutches 2 and 3, a high pressure gas turbine 4 and a low pressure A gas turbine including the gas turbine 5 is provided. 1
Reference numeral 3 denotes a gas turbine combustor, reference numeral 14 denotes a gas turbine exhaust heat recovery heat exchanger (regenerator), and reference numeral 15 denotes a cavity for storing compressed air.

9-1, 9-2, 10-1, 10-2, 1
Reference numerals 1-1 and 11-2 denote air release valves. With respect to the illustrated valves including these air release valves, those with a white background are open and those with black fill are closed.

FIGS. 1 to 6 show an example in which the compressor is started according to the present invention using the compressed air stored in the cavity 15 in the compressed air storage and power generation system having the above configuration.
This will be described with reference to FIG.

FIG. 1 shows a state before starting the compressor, in which the clutches 2 and 3 on both sides of the motor generator 1 are turned on, and the gas turbine 4 is turned on.
5 and the compressors 6, 7, 8 are connected. At this time, the variable front stationary blade of the first-stage (low-pressure) compressor 6 is set at the lowest blow position.

FIG. 2 shows the operation of the blower valves on the compressor side before the compressor is started, and shows the blower valves 9- of the three compressors 6, 7, and 8.
1, 9-2, 10-1, 10-2, 11-1, 11-2
Open.

FIG. 3 shows a state in which the compressed air is guided from the cavity 15 to the gas turbine and ignites the combustor 13 to drive the gas turbine. Valve operation is performed as shown by the arrow in the figure from ventilation to ignition. In FIG. 3, the combustor 13 is ignited by the system of the flow control valve 12 for starting. The air flow rate when the combustor ignites greatly changes from the rated time.

In this system, a regenerator 14 which is a heat exchanger for recovering exhaust heat of a gas turbine is used for improving efficiency.
The air supplied to the gas turbine is heated by the gas turbine exhaust when passing through the regenerator 14.

Accordingly, the temperature of the air flowing in at the time of start-up greatly changes depending on the condition of the regenerator 14 and the cavity 15 or the air tank. Therefore, it is necessary to operate in two operation modes, cold start and hot start.

FIG. 4 shows a state after the gas turbine is started until the gas turbine reaches the rated speed. When the gas turbine is accelerated to the rated speed and reaches the rated speed, the motor generator 1 is turned off. Synchronize.

FIG. 5 shows a state in which the gas turbine reaches the rated speed and separates from the gas turbine. In this state, the fuel in the combustor 13 is shut off, thereby turning off the gas turbine side clutch 3. .

FIG. 6 shows a state in which the start of the compressor has been completed, and air has been blown into the cavity 15 from the compressor driven by the motor generator 1. That is, in FIG. 6, while opening the variable front stationary blade of the first stage compressor 6, the blow-off valve 9-
1, 9-2, 10-1, 10-2, 11-1, 11-2
Is closed, and when the discharge pressure exceeds the pressure of the cavity 15 or the air tank, the blowing is started.

With the above operation, the compressor can be started by the gas turbine using the compressed air stored in the cavity 15.

[0030]

As described above, according to the method for starting the compressor in the compressed air storage and power generation system according to the present invention, the clutches on both sides of the motor generator are connected and the stored compressed air and fuel are supplied to the gas turbine. After sending the gas turbine to start up the gas turbine to the rated speed, the clutch on the gas turbine side is disconnected and the compressor is rotated by the motor generator.

Therefore, according to the starting method of the present invention, by starting up the compressor by the gas turbine using the stored pressurized air, the starting device conventionally required can be omitted.

Therefore, according to the present invention, the equipment configuration of the compressed air storage and power generation system can be simplified, and the reliability of the compressed air storage and power generation system is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a compressed air storage and power generation system to which a compressor starting method according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing a state in which a blow-off valve is operated in starting the compressor in the power generation system of FIG. 1;

FIG. 3 is an explanatory diagram showing a state in the power generation system of FIG. 1 from venting to a gas turbine to start a compressor to igniting a gas turbine combustor.

FIG. 4 is an explanatory diagram showing a state after the gas turbine is started and before the motor generator is synchronously driven in the power generation system of FIG. 1;

FIG. 5 In the power generation system of FIG. 1, after starting the compressor,
Explanatory drawing which shows the state which detached the gas turbine.

FIG. 6 is an explanatory diagram showing a state in which air is blown to the cavity by the compressor in the power generation system of FIG. 1;

FIG. 7 is an explanatory diagram showing a configuration of a conventional compressed air storage power generation system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor generator 2, 3 Clutch 4 High pressure gas turbine 5 Low pressure gas turbine 6 1st stage compressor 7 2nd stage compressor 8 3rd stage compressor 9-1 Blow-off valve 9-2 Blow-off valve 10- DESCRIPTION OF SYMBOLS 1 Blow-off valve 10-2 Blow-off valve 11-1 Blow-off valve 11-2 Blow-off valve 12 Flow control valve 13 Combustor 14 Regenerator 15 Cavity

Claims (1)

[Claims] 1. A compressor and a gas turbine respectively provided on both sides of a motor generator via a clutch, and an air storage source is provided between a downstream side of the compressor and an upstream side of the gas turbine. When the power demand is low, the motor generator is driven to store the air compressed by the compressor in the air storage source, and the fuel is burned using the stored compressed air at the time of power demand to operate the gas turbine. In the compressed air storage and power generation system configured to drive and generate electric power, the clutches on both sides of the motor generator are connected, the stored compressed air and fuel are sent to the gas turbine, and the gas turbine is started to stand up to a rated rotation speed. After raising, the clutch on the gas turbine side is disengaged, and the compressor is rotated by the motor generator. Movement method.