阅读说明：本技术 一种用于燃气轮机联合循环发电机组的压缩空气储能系统 (Compressed air energy storage system for gas turbine combined cycle generator set ) 是由 梁奇 陈海生 左志涛 张雪辉 周鑫 孙建亭 于 2020-03-20 设计创作，主要内容包括：本发明公开了一种用于燃气轮机联合循环发电机组的压缩空气储能系统,包括燃气轮机联合循环发电机组、压缩空气储能单元、热回收单元,压缩空气储能单元与燃气轮机联合循环发电机组共用透平装置,当低谷电能时,能够将多余的电能通过压缩空气储能单元储存在储气装置中,当用电高峰时,能够将高压气体通过燃气轮机透平装置做功转化为电能反馈到电网中,实现电网调峰,从而减少机组启停次数,增加机组年利用小时数。压缩空气储能单元与燃气轮机联合循环发电机组共用一套变频启动单元,通过动力切换实现燃气轮机装置、压缩空气储能单元的启动和脱开,能够实现燃气轮机联合循环发电机组黑启动,有效地提高系统可靠性,满足突发状况下自启动需求。(The invention discloses a compressed air energy storage system for a gas turbine combined cycle generator set, which comprises the gas turbine combined cycle generator set, a compressed air energy storage unit and a heat recovery unit, wherein the compressed air energy storage unit and the gas turbine combined cycle generator set share a turbine device, when the power is in a low-ebb, redundant electric energy can be stored in an air storage device through the compressed air energy storage unit, and when the power is in a peak, high-pressure gas can be converted into electric energy through the work of the gas turbine device and fed back to a power grid, so that the peak regulation of the power grid is realized, the start and stop times of the unit are reduced, and the annual utilization hours of the unit are increased. The compressed air energy storage unit and the gas turbine combined cycle generator set share one set of variable frequency starting unit, starting and releasing of the gas turbine device and the compressed air energy storage unit are achieved through power switching, black starting of the gas turbine combined cycle generator set can be achieved, system reliability is effectively improved, and self-starting requirements under sudden conditions are met.)

1. A compressed air energy storage system for a gas turbine combined cycle generator set at least comprises a gas turbine combined cycle generator set, a heat recovery unit, a compressed air energy storage unit and a variable frequency starting unit, wherein the variable frequency starting unit comprises an electric motor and a frequency converter matched with the electric motor,

-said gas turbine combined cycle power plant comprising at least a gas turbine unit and a double shaft extension generator, wherein,

the gas turbine device at least comprises a gas compressor, a combustion chamber, a turbine and a reduction gear box which are sequentially arranged, wherein one end of the turbine is in transmission connection with the gas compressor, the other end of the turbine is in transmission connection with the input end of the reduction gear box, the output end of the reduction gear box is in transmission connection with one end of the double-shaft stretching generator, and the other end of the double-shaft stretching generator is provided with a first clutch;

the air inlet of the compressor is communicated with the atmosphere, the air outlet of the compressor is communicated with the high-pressure air inlet of the combustion chamber through a pipeline, the high-temperature gas outlet of the combustion chamber is communicated with the air inlet of the turbine, and the air outlet of the turbine is communicated with the atmosphere;

-said heat recovery unit comprising at least a cold water tank, a hot water tank, a first heat exchanger and a second heat exchanger, wherein,

the water outlet of the cold water tank is communicated with the water inlet of the hot water tank through a first switch valve, the cold side of the first heat exchanger and a second switch valve in sequence by pipelines,

the water outlet of the hot water tank is communicated with the water inlet of the cold water tank through a third switch valve, the hot side of the second heat exchanger and a fourth switch valve in sequence through pipelines;

-said compressed air energy storage unit comprising at least an air compressor and an air storage means, wherein,

the first input shaft of the air compressor is in transmission connection with the motor through a second clutch, and the second input shaft of the air compressor is in transmission connection with the other end of the double-shaft extension generator through the first clutch;

the air inlet of the air compressor is communicated with the atmosphere, the air outlet of the air compressor is communicated with the air inlet of the air storage device after passing through the hot side of the first heat exchanger and a first control valve through pipelines, the air outlet of the air compressor is also communicated and provided with an anti-surge air release pipeline, and the anti-surge air release pipeline is provided with an anti-surge air release valve;

and an exhaust port of the gas storage device is communicated with a high-pressure air inlet of the combustion chamber through a throttle valve, the cold side of the second heat exchanger and a second control valve in sequence through pipelines.

2. A compressed air energy storage system for a gas turbine combined cycle power plant according to the preceding claim, wherein the air compressor is an integrally geared compressor and is equipped with an inlet adjustable guide vane device, having the characteristics of high efficiency, high variable duty capability and facilitating interstage heat recovery.

3. A compressed air energy storage system for a gas turbine combined cycle power plant according to the preceding claims, characterized in that the frequency converter is a four quadrant frequency converter, able to meet the electricity demand under specific conditions.

4. A compressed air energy storage system for a gas turbine combined cycle power plant according to the preceding claim wherein the first and second clutches are SSS clutches provided with locking means, the clutches being disengaged when the input speed is lower than the output speed and automatically engaged when the input speed is the same as the output speed.

5. The compressed air energy storage system for a gas turbine combined cycle power generation unit of claim, wherein the heat recovery unit is capable of storing the compressed heat generated by the compressed air energy storage unit with circulating water during off-peak power consumption and heating the gas after the throttle valve of the gas storage device during peak power consumption to improve the thermal efficiency of the system.

6. A compressed air energy storage system for a gas turbine combined cycle power plant according to the preceding claim wherein the air storage means is an air storage tank, air storage piping or waste salt cavern or the like.

7. The compressed air energy storage system for a gas turbine combined cycle generator set as claimed in the preceding claim, wherein in the heat recovery unit, a direct communication pipeline is further arranged between the cold water tank 18 and the hot water tank 21, at least a fifth switch valve is arranged on the direct communication pipeline, and after the fifth switch valve is opened, the hot water in the hot water tank is delivered to the cold water tank.

8. A compressed air energy storage system for a gas turbine combined cycle power plant according to the preceding claim, wherein in the heat recovery unit, water pumps are provided on the communication line between the cold water tank and the cold side of the first heat exchanger and on the communication line between the hot water tank and the hot side of the second heat exchanger.

9. The compressed air energy storage system for the gas turbine combined cycle generator set according to the previous claim, wherein in the compressed air energy storage unit, a second turbine is further arranged on a hot side outlet pipeline of the second heat exchanger, and the high-temperature high-pressure gas at the outlet of the hot side of the second heat exchanger is introduced into the second turbine to do work outwards to reduce pressure and then is introduced into the combustion chamber.

10. A method of controlling a compressed air energy storage system for a gas turbine combined cycle power plant according to any one of the preceding claims,

when the gas turbine combined cycle power plant is in a start-up mode,

firstly, setting an inlet adjustable guide vane device and an anti-surge air release valve of the air compressor to be in a full-open state, setting the first control valve and the second control valve to be in a full-closed state, and setting the first clutch and the second clutch to be in an engaged state;

secondly, after the gas turbine combined cycle generator set is ready, starting the motor through the frequency converter, and gradually increasing the rotating speed of the motor to enable the gas turbine device to sequentially complete the processes of blowing, ignition and heating;

after the gas turbine device reaches the self-sustaining rotating speed, maintaining the rotating speed of the motor at the self-sustaining rotating speed of the gas turbine device through the frequency converter;

when the gas turbine device continues to increase the rotating speed, the rotating speed of the output end of the first clutch is larger than that of the input end and is automatically disengaged, then the gas turbine device continues to increase the rotating speed to a full-speed state, and meanwhile, the rotating speed of the motor is gradually reduced through the frequency converter until the motor stops rotating, so that the starting of the gas turbine combined cycle generator set is completed.

Technical Field

The invention belongs to the technical field of compressed air energy storage, and particularly relates to a compressed air energy storage system for a gas turbine combined cycle generator set and a control method thereof.

Background

With the change of energy structures and the development of clean coal utilization technologies, gas turbine combined cycle (IGCC) is an advanced power generation technology, can save increasingly tense energy resources in the world, can protect the environment, and gradually becomes an important component in the world power industry. In China, a combined cycle power generating unit of a gas turbine mostly takes peak-shaving frequency modulation as a main mode, and a two-shift operation mode of opening in the daytime and stopping at night is adopted, so that the starting and stopping times of the power generating unit are more, and the annual utilization hours are lower.

In addition, when equipment such as a power transmission line and a transformer matched with the gas turbine combined cycle generator set breaks down, a large power failure accident is easily caused, and catastrophic social influence and economic loss are caused. If the normal operation of the power grid can be quickly recovered in a short time, the load loss and the economic loss are reduced to the minimum, and remarkable social benefits can be brought. However, the gas turbine combined cycle generator set does not have the black start function, and additional equipment needs to be equipped, so that the investment is increased.

Disclosure of Invention

The invention aims to provide a compressed air energy storage system for a gas turbine combined cycle generator set, which aims to solve the problems in the prior art. In addition, the compressed air energy storage unit and the gas turbine combined cycle generator set share one set of variable frequency starting unit, the starting of the gas turbine device and the starting and the releasing of the compressed air energy storage unit are realized through power switching, the black starting of the gas turbine combined cycle generator set can be realized, the system reliability is effectively improved, and the self-starting requirement under the sudden situation is met.

In order to achieve the purpose, the invention adopts the following technical scheme:

a compressed air energy storage system for a gas turbine combined cycle generator set at least comprises a gas turbine combined cycle generator set, a heat recovery unit, a compressed air energy storage unit and a variable frequency starting unit, wherein the variable frequency starting unit comprises an electric motor and a frequency converter matched with the electric motor,

-said gas turbine combined cycle power plant comprising at least a gas turbine unit and a double shaft extension generator, wherein,

the gas turbine device at least comprises a gas compressor, a combustion chamber, a turbine and a reduction gear box which are sequentially arranged, wherein one end of the turbine is in transmission connection with the gas compressor, the other end of the turbine is in transmission connection with the input end of the reduction gear box, the output end of the reduction gear box is in transmission connection with one end of the double-shaft stretching generator, and the other end of the double-shaft stretching generator is provided with a first clutch;

the air inlet of the compressor is communicated with the atmosphere, the air outlet of the compressor is communicated with the high-pressure air inlet of the combustion chamber through a pipeline, the high-temperature gas outlet of the combustion chamber is communicated with the air inlet of the turbine, and the air outlet of the turbine is communicated with the atmosphere;

-said heat recovery unit comprising at least a cold water tank, a hot water tank, a first heat exchanger and a second heat exchanger, wherein,

the water outlet of the cold water tank is communicated with the water inlet of the hot water tank through a first switch valve, the cold side of the first heat exchanger and a second switch valve in sequence by pipelines,

the water outlet of the hot water tank is communicated with the water inlet of the cold water tank through a third switch valve, the hot side of the second heat exchanger and a fourth switch valve in sequence through pipelines;

-said compressed air energy storage unit comprising at least an air compressor and an air storage means, wherein,

the first input shaft of the air compressor is in transmission connection with the motor through a second clutch, and the second input shaft of the air compressor is in transmission connection with the other end of the double-shaft extension generator through the first clutch;

the air inlet of the air compressor is communicated with the atmosphere, the air outlet of the air compressor is communicated with the air inlet of the air storage device after passing through the hot side of the first heat exchanger and a first control valve through pipelines, the air outlet of the air compressor is also communicated and provided with an anti-surge air release pipeline, and the anti-surge air release pipeline is provided with an anti-surge air release valve;

and an exhaust port of the gas storage device is communicated with a high-pressure air inlet of the combustion chamber through a throttle valve, the cold side of the second heat exchanger and a second control valve in sequence through pipelines.

In the compressed air energy storage system for the gas turbine combined cycle generator set, the compressed air energy storage unit and the gas turbine combined cycle generator set share the turbine device, when the electric energy is in a low valley, redundant electric energy can be stored in the air storage device through the compressed air energy storage unit, and when the electricity consumption is in a peak, high-pressure gas can be converted into the electric energy through the work of the gas turbine device and fed back to a power grid, so that the peak regulation of the power grid is realized, the start-stop times of the unit are reduced, and the annual utilization hours of the unit are increased. The compressed air energy storage unit and the gas turbine combined cycle generator set share one set of variable frequency starting unit, power switching is carried out through the first clutch and the second clutch, starting and disengaging of the gas turbine starting unit and the compressed air energy storage unit are achieved, black starting of the gas turbine combined cycle generator set can be achieved, system reliability is effectively improved, and self-starting requirements under sudden conditions are met.

In a preferred embodiment of the present invention, the air compressor is an integral gear compressor, and is equipped with an inlet adjustable guide vane device, and has characteristics of high efficiency, strong variable working condition capability, and convenience for interstage heat recovery.

As a preferred scheme of the present invention, the frequency converter is a four-quadrant frequency converter, and can meet the power consumption requirement under a specific condition.

In a preferred embodiment of the present invention, the first and second clutches are SSS clutches each having a locking device, and the clutches are disengaged when the input rotation speed is lower than the output rotation speed, and automatically engaged when the input rotation speed is the same as the output rotation speed.

In a preferred embodiment of the present invention, the heat recovery unit is capable of storing the compressed heat generated by the compressed air energy storage unit by using circulating water during off-peak electricity energy, and heating the gas after the throttle valve of the gas storage device during peak electricity energy consumption, thereby improving the thermal efficiency of the system.

As a preferable scheme of the present invention, the gas storage device is a gas storage tank, a gas storage pipeline, a waste salt cavern, or the like.

In a preferred embodiment of the present invention, in the heat recovery unit, a directly connected pipeline is further disposed between the cold water tank 18 and the hot water tank 21, at least a fifth on-off valve is disposed on the directly connected pipeline, and after the fifth on-off valve is opened, the hot water in the hot water tank is delivered to the cold water tank.

As a preferable scheme of the present invention, in the heat recovery unit, water pumps are respectively disposed on a communication pipeline between the cold water tank and the cold side of the first heat exchanger, and a communication pipeline between the hot water tank and the hot side of the second heat exchanger.

As a preferable scheme of the invention, in the compressed air energy storage unit, a second turbine is further arranged on an outlet pipe at the hot side of the second heat exchanger, and the high-temperature high-pressure gas at the outlet at the hot side of the second heat exchanger is introduced into the second turbine to do work outwards to reduce pressure, and then is introduced into the combustion chamber.

As another object of the invention, the invention also provides a control method of the compressed air energy storage system for the gas turbine combined cycle power generating unit, which is characterized in that,

when the gas turbine combined cycle power plant is in a start-up mode,

firstly, setting an inlet adjustable guide vane device and an anti-surge air release valve of the air compressor to be in a full-open state, setting the first control valve and the second control valve to be in a full-closed state, and setting the first clutch and the second clutch to be in an engaged state;

secondly, after the gas turbine combined cycle generator set is ready, starting the motor through the frequency converter, and gradually increasing the rotating speed of the motor to enable the gas turbine device to sequentially complete the processes of blowing, ignition and heating;

after the gas turbine device reaches the self-sustaining rotating speed, maintaining the rotating speed of the motor at the self-sustaining rotating speed of the gas turbine device through the frequency converter;

when the gas turbine device continues to increase the rotating speed, the rotating speed of the output end of the first clutch is larger than that of the input end and is automatically disengaged, then the gas turbine device continues to increase the rotating speed to a full-speed state, and meanwhile, the rotating speed of the motor is gradually reduced through the frequency converter until the motor stops rotating, so that the starting of the gas turbine combined cycle generator set is completed.

As a preferred scheme of the present invention, in the operation process of the gas turbine combined cycle power generation unit, the peak shaving is performed by the compressed air energy storage unit, specifically:

before starting the air compressor, setting an inlet adjustable guide vane device of the air compressor to be in a fully-closed state, setting the surge-relieving air release valve to be in a fully-opened state, setting the first control valve and the second control valve to be in a fully-closed state, setting the first clutch to be in a disengaged state, and setting the second clutch to be in an engaged state;

starting the motor and gradually increasing the rotation speed of the motor through the frequency converter after the air compressor is ready, setting the first clutch to be in an engaged state and setting a locking device of the first clutch to be in a locked state when the rotation speed of the air compressor reaches the full-speed state of the gas turbine combined cycle generator set, setting the second clutch to be in a disengaged state, and gradually reducing the rotation speed of the motor through the frequency converter until the rotation is stopped;

and after the air compressor reaches a full-speed state, gradually opening the first control valve, establishing the back pressure of the compressor, gradually closing the surge-relieving air release valve, adjusting an inlet guide vane device of the air compressor, and gradually increasing the load of the air compressor to enable the air compressor to reach a full-load state.

Further, after the air storage device reaches the set pressure, the air compressor enters a shutdown process, at this time, the first control valve is gradually closed, the surge relief valve is gradually opened, the locking device of the first clutch is changed from a locked state to an unlocked state, and the first clutch is disengaged, so that the rotating speed of the air compressor is gradually reduced until the air compressor stops rotating.

Furthermore, in the operation process of the compressed air energy storage unit, the first switch valve and the second switch valve are opened, the third switch valve and the fourth switch valve are closed, and cold water in the cold water tank is conveyed to the cold side of the first heat exchanger to be heated and then enters the hot water tank to be stored.

In a preferred embodiment of the present invention, when the compressed air energy storage unit releases energy, the first control valve is closed, the second control valve is opened, and the flow rate and pressure of the gas entering the combustion chamber are adjusted by the throttle valve.

Furthermore, in the energy releasing process of the compressed air energy storage unit, the third switch valve and the fourth switch valve are opened, the first switch valve and the second switch valve are closed, and hot water in the hot water tank is conveyed to the hot side of the second heat exchanger to be cooled and then enters the cold water tank to be stored.

Compared with the prior art, the invention has the beneficial effects that: the compressed air energy storage system for the gas turbine combined cycle generator set, provided by the invention, has the advantages that the compressed air energy storage unit and the gas turbine combined cycle generator set share the turbine device, when the electric energy is in a low valley, the redundant electric energy can be stored in the air storage device through the compressed air energy storage unit, when the electricity consumption is in a peak, the high-pressure gas can be converted into the electric energy through the work of the gas turbine device and fed back to the power grid, the peak regulation of the power grid is realized, the start and stop times of the unit are reduced, and the annual utilization hours of the unit are increased. The compressed air energy storage system for the gas turbine combined cycle generator set, provided by the invention, has the advantages that the compressed air energy storage unit and the gas turbine combined cycle generator set share one set of variable frequency starting system, the starting of the gas turbine device and the starting and the disconnection of the compressed air energy storage unit are realized through power switching, the black starting of the gas turbine combined cycle generator set can be realized, the system reliability is effectively improved, and the self-starting requirement under the sudden situation is met.

Drawings

FIG. 1 is a schematic diagram of the components of a compressed air energy storage system for a gas turbine combined cycle power plant of the present invention.

FIG. 2 is a preferred schematic diagram of the compressed air energy storage system for a gas turbine combined cycle power plant of the present invention.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the compressed air energy storage system for a gas turbine combined cycle power plant of the present invention at least comprises a gas turbine combined cycle power plant, a heat recovery unit and a compressed air energy storage unit. The gas turbine combined cycle generator set at least comprises a gas turbine device and a double-shaft extension generator 5, wherein the gas turbine device at least comprises a gas compressor 1, a combustion chamber 2, a gas turbine 3 and a reduction gear box 4 which are sequentially arranged, one end of the gas turbine 3 is in transmission connection with the gas compressor 1, the other end of the gas turbine 3 is in transmission connection with the input end of the reduction gear box 4, the output end of the reduction gear box 4 is in transmission connection with one end of the double-shaft extension generator 5, and the other end of the double-shaft extension generator 5 is provided with a first clutch 6 (preferably an SSS clutch); the air inlet of the air compressor 1 is communicated with the atmosphere, the air outlet is communicated with the high-pressure air inlet of the combustion chamber 2 through a pipeline, the high-temperature gas outlet of the combustion chamber 2 is communicated with the air inlet of the gas turbine 3, and the air outlet of the gas turbine 3 is communicated with the atmosphere.

The heat recovery unit at least comprises a cold water tank 18, a hot water tank 21, a first heat exchanger 12 and a second heat exchanger 16, wherein a water outlet of the cold water tank 18 is communicated with a water inlet of the hot water tank 21 after sequentially passing through a first switch valve 19, a cold side of the first heat exchanger 12 and a second switch valve 20 through a pipeline, and a water outlet of the hot water tank is communicated with a water inlet of the cold water tank 18 sequentially passing through a third switch valve 22, a hot side of the second heat exchanger 16 and a fourth switch valve 17 through a pipeline; a communication pipeline provided with a fifth switch valve 23 is also arranged between the cold water tank 18 and the hot water tank 21.

The compressed air energy storage unit at least comprises an air compressor 7 and an air storage device 14, wherein the air compressor 7 is an integral gear type compressor provided with an inlet adjustable guide vane device, a first input shaft of the air compressor 7 is in transmission connection with a motor 9 through a second clutch 8 (preferably an SSS clutch), the motor 9 is matched with a frequency converter 10, and a second input shaft of the air compressor 7 is in transmission connection with the other end of the double-shaft stretching generator 5 through a first clutch 6; an air inlet of the air compressor 7 is communicated with the atmosphere, an air outlet of the air compressor 7 is communicated with an air inlet of the air storage device 14 after passing through a hot side of the first heat exchanger 12 through a pipeline, an anti-surge air release pipeline is further communicated and arranged on the air outlet of the air compressor 7, at least one anti-surge air release valve 11 is arranged on the anti-surge air release pipeline, and at least one first control valve 13 is further arranged on an air inlet pipeline of the air storage device 14; the exhaust port of the air storage device 14 is communicated with the high-pressure air inlet of the combustion chamber 2 through a throttle valve 15, the cold side of the second heat exchanger 16 and a second control valve 24 in sequence through pipelines.

In the compressed air energy storage system for the gas turbine combined cycle generator set, when the gas turbine combined cycle generator set is in a starting mode, the starting process is realized by the aid of the first clutch 6, the second clutch 8 and the motor 9 which is started in a frequency conversion mode through the frequency converter 10.

Specifically, as shown in fig. 1, before the gas turbine combined cycle power generator set is started, the inlet adjustable guide vane device in the integrally geared compressor 7 is in a fully closed state, the surge-reducing purge valve 11 is in a fully open state, and the first control valve 13 and the second control valve 24 are in a fully closed state; the input and output of the first SSS clutch 6 and the second SSS clutch 8 are all in a meshing state, and can transmit torque and rotating speed.

After the gas turbine combined cycle generator set is ready, setting a certain lower rotating speed of the motor 9 in the frequency converter 10, starting the motor 9 through the frequency converter 10, and gradually increasing the rotating speed, wherein the gas turbine device finishes the processes of blowing, igniting and warming up in sequence; after the gas turbine device reaches the self-sustaining rotating speed, the frequency converter 10 ensures that the motor 9 is at the self-sustaining rotating speed of the gas turbine device, and when the gas turbine device continues to increase the rotating speed, the rotating speed of the output end of the first SSS clutch 6 is greater than that of the input end, so that the clutch 6 is disengaged; after the first SSS clutch 6 is disengaged, the gas turbine installation continues to increase the rotational speed to full speed, and the electric motor 9 is gradually reduced in rotational speed by means of the frequency converter 10 and brought to a standstill. To this end, the gas turbine combined cycle power generation unit completes the start-up process.

In the compressed air energy storage system for the gas turbine combined cycle generator set, when the peak load of the compressed air energy storage unit is regulated in the operation process of the gas turbine combined cycle generator set, the energy storage process is realized by the air compressor 7 and the air storage device 14, and the energy release process is realized by the air storage device 14 and the gas turbine 3 of the gas turbine combined cycle generator set.

Specifically, as shown in fig. 1, during the operation of the gas turbine combined cycle generator set, the start, operation and stop of the integrally geared compressor 7 are realized through the first SSS clutch 6/8 and the motor 9 which is frequency-converted by the frequency converter 10, and the energy storage process of the compressed air energy storage unit is completed.

Before the integral gear type compressor 7 is started, the inlet adjustable guide vane device is set to be in a fully closed state, the surge-relieving air release valve 11 is in a fully open state, the first control valve 13/24 and the second control valve 13/24 are in a fully closed state, the first SSS clutch 6 is in a disengaged state, and the second SSS clutch 8 is in a meshed state. After the integrally geared compressor 7 is ready, a certain low rotation speed of the motor 9 is set in the inverter 10, and then the motor 9 is started through the inverter 10 and the rotation speed is gradually increased; when the rotating speed of the integral gear type compressor 7 reaches the full-speed state of the gas turbine combined cycle generator set, the output end and the input end of the first SSS clutch 6 are automatically meshed, and the locking device is in a locking state, so that the output end can transmit torque to the input end; after the first SSS clutch 6 is automatically engaged, the motor 9 gradually reduces the rotation speed through the frequency converter 10, at the moment, the second SSS clutch 8 is disengaged, and the motor 9 gradually reduces the rotation speed and reaches a stop state.

When the integral gear type compressor 7 reaches the full speed state, the first control valve 13 is gradually opened to establish the back pressure of the compressor, at the moment, the surge-relieving air release valve 11 is gradually closed, the inlet guide vane device is adjusted, and the load of the integral gear type compressor 7 is gradually increased to enable the integral gear type compressor to reach the full load state.

When the gas storage device 14 reaches the set pressure, the integral gear type compressor 7 enters a shutdown process. At this time, the first control valve 13 is gradually closed, and the surge-relieving air-release valve 11 is gradually opened; the locking device of the first SSS clutch 6 is changed from locking to unlocking state, and the clutch 6 is disengaged because the rotating speed of the output end is greater than that of the input end, the rotating speed of the integral gear type compressor 7 is gradually reduced, and the state of stopping is achieved.

In the operation process of the gas turbine combined cycle generator set, the frequency converter 10 can output electric energy to the outside to meet the power consumption requirement under a specific condition. A certain lower rotation speed of the motor 9 is set in the frequency converter 10, then the motor 9 is started through the frequency converter 10, the rotation speed is gradually increased, when the rotation speed of the motor 9 reaches the rotation speed of the integral gear type compressor 7, the output end and the input end of the second SSS clutch 8 are automatically meshed, and the locking device is in a locking state, so that the output end can transmit torque to the input end, and electric energy is output outwards through the frequency converter 10.

As shown in fig. 1, during the operation of the gas turbine combined cycle power generation unit, the energy release process of the compressed air energy storage system is realized through the air storage device 14, the throttle valve 15 and the gas turbine 3. In the energy releasing process, the first control valve 13 is closed, the second control valve 24 is opened, and the flow and the pressure of gas entering the combustion chamber 2 are regulated through the throttle valve 15, so that the power consumption requirement of a power grid is met. After the energy releasing process of the compressed air energy storage system, the pressure in the air storage device 14 is kept at a certain level, and the black start pressure requirement of the gas turbine combined cycle generator set is met.

As shown in fig. 1, the compressed air energy storage unit is provided with a heat recovery unit. In the energy storage process, the first switch valve 19/20 and the second switch valve 19/20 are opened, the third switch valve 17/22/23 and the fifth switch valve 17/22/23 are closed, and cold water in the cold water tank 18 enters the cold side of the first heat exchanger 12 through a water pump to be heated and then enters the hot water tank 21 for storage; in the energy releasing process, the third switch valve 17/22 and the fourth switch valve 17/22 are opened, the first switch valve 19/20/23, the second switch valve 19/20/23 and the fifth switch valve 19/20/23 are closed, hot water in the hot water tank 18 enters the hot side of the second heat exchanger 16 through the water pump to heat gas after passing through the throttle valve 15 of the gas storage device 14, and the hot water enters the cold water tank 18 to be stored after the temperature is reduced; after the fifth on-off valve 23 is opened, hot water in the hot water tank 21 can be transferred to the cold water tank 18 by the water pump.

The compressed air energy storage system for the gas turbine combined cycle generator set regulates the flow and pressure of gas entering the combustion chamber 2 through the throttle valve 15, and meets the starting torque requirement of a gas turbine device. And then, gradually increasing the rotating speed of the gas turbine device, sequentially completing the processes of blowing, ignition and warming, gradually loading to reach a full-load state, gradually enlarging the power supply recovery range of the system, and finally realizing the recovery of the whole system.

Referring to fig. 2, in the compressed air energy storage system for a gas turbine combined cycle power generation unit according to the present invention, a turbine 25 is added in front of the second control valve 24, at this time, the high-pressure gas in the gas storage device 14 is reduced in pressure through the throttle valve 15, and after the temperature is raised through the second heat exchanger 16, the high-pressure gas enters the turbine 25 to do work to reduce the pressure, so that the system efficiency can be further improved.

The compressed air energy storage system and the gas turbine combined cycle generator set provided by the invention share the turbine device, when the electricity is in a low valley, redundant electricity can be stored in the gas storage device through the compression system, and when the electricity is in a peak, high-pressure gas can be converted into electricity through the work of the gas turbine device and fed back to a power grid, so that the peak regulation of the power grid is realized, the start-stop times of the generator set are reduced, and the annual utilization hours of the generator set are increased. The compressed air energy storage system and the gas turbine combined cycle generator set share one set of variable frequency starting system, the starting of the gas turbine, the starting and the releasing of the compression system are realized through the power switching system, the black starting of the gas turbine combined cycle generator set can be realized, the system reliability is effectively improved, and the self-starting requirement under the sudden situation is met.

The object of the present invention is fully effectively achieved by the above embodiments. Those skilled in the art will appreciate that the present invention includes, but is not limited to, what is described in the accompanying drawings and the foregoing detailed description. While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications within the spirit and scope of the appended claims.