CN105756727B - A kind of synthesis air supply system for test bench for gas turbine - Google Patents

Abstract

The invention discloses a comprehensive gas source system for a gas turbine test bench, comprising a motor, an air compression subsystem, a gas storage device, a heat accumulator, an air purification device, an air expansion unit, a generator and a cooling water subsystem. The invention has a complete structure, and can realize the separate supply of low-pressure, medium-pressure and high-pressure compressed air during the compression process; can realize the storage of the remaining compressed air, and can also provide different types of air for the test bench without starting the air compression subsystem. Air source: the difference in peak and valley electricity prices can be used to store compressed air during the trough, and provide it to the test bench at different times, and the remaining compressed air will be connected to the power grid through the air expansion unit to generate power, thereby improving energy utilization and recovering part of the electric energy. Operating costs; Finally, the heat of compression and frictional heat of equipment can be recovered and provided for use in the gas expansion stage or external heat source.

Description

An integrated gas source system for gas turbine test bench

technical field

The invention relates to a comprehensive gas source system for a gas turbine test bench, which belongs to the field of industrial gas turbines.

Background technique

The gas source system is an important part of the gas turbine test bench, especially the gas turbine test bench that has completed various types of tests. Large-flow equipment uses gas, so a complete gas source system must be established to meet the overall needs of the gas turbine test bench.

At present, two or more gas source systems with different parameter requirements are usually built at the same time according to the actual needs of the gas turbine test bench, so that it can not only match the demand for low-pressure and low-flow gas source, but also match the demand for high-pressure and large-flow gas source. However, since the construction of the gas source system is a relatively complex system engineering, including a large number of equipment and components, the construction period is long, the capital investment is large, and during the long-term test of the gas turbine, the equipment operation cost is very high, and many different types of gas source systems are constructed. It will greatly increase the construction capital investment and operation and management costs. Therefore, it is necessary to design a comprehensive gas source system with a more reasonable structure, so that it can save energy and use energy efficiently while meeting the needs of gas turbine test benches for different types of gas sources.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention designs a gas source system capable of comprehensive gas supply, heat energy recovery, complete structure and complete functions, which can not only meet the requirements of the gas turbine test bench, but also recycle part of the heat energy. At the same time, it is also possible to store the compressed air in the gas storage device in advance during the low power consumption, and when necessary, reduce the pressure to adjust and release the compressed air of different pressures, which can be used for the gas turbine test bench, or the internal energy of the compressed air can be used during the peak power consumption. It is converted into electric energy output, and at the same time, it can supply gas in stages to achieve efficient use of energy.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

A comprehensive air source system for a gas turbine test bench, including a motor, an air compression subsystem, a gas storage device, an air purification device, an air expansion unit, a generator, and a cooling water subsystem; the motor drives the air compression subsystem to extract ambient air Compressed into low-pressure, medium-pressure and high-pressure compressed air, the low-pressure compressed air is output to the air storage device and the air purification device respectively, the medium-pressure compressed air is output to the air storage device and the air purification device respectively, and the high-pressure compressed air is directly output to the air storage device; The compressed air in the gas storage device is output to the air purification device and the air expansion unit respectively; the air purification device purifies and filters the low-pressure, medium-pressure and high-pressure compressed air and outputs them to the test bench respectively; the air expansion unit is connected to the generator drive, and the compression The air enters the air expansion unit to generate power and is output to the air purification device at the same time, and the exhaust gas is discharged into the atmosphere through the discharge pipeline; the cooling water subsystem includes a water storage device and a water pump, and the cooling water is respectively output to the air compression subsystem under the action of the water pump and the air expansion unit, which also includes a heat accumulator, which is used for endothermic cooling of the compressed air in the air compression subsystem, heating of the compressed air in the air expansion unit, and output from the air compression subsystem and the air expansion unit The cooling water performs endothermic cooling before returning to the water storage device and provides a heat source to the external heat source user, and the heat accumulator is an insulated container filled with a heat exchange medium inside.

Further, the air compression subsystem includes a centrifugal compressor unit and a piston compressor unit arranged in series, the centrifugal compressor unit has a multi-stage structure, and the piston compressor unit includes medium-pressure and high-pressure piston compressors, The centrifugal compressor unit compresses the ambient air into low-pressure compressed air, and the low-pressure compressed air is respectively output to the medium-pressure piston compressor, the gas storage device and the air purification device after being cooled by the heat accumulator, and the medium-pressure piston compressor The output medium-pressure compressed air is respectively output to the high-pressure piston compressor, gas storage device and air purification device after being absorbed and cooled by the heat accumulator, and the high-pressure compressed air output by the high-pressure piston compressor is directly output to the gas storage device.

Further, a first low-pressure buffer tank is arranged between the centrifugal compressor unit and the piston compressor unit, and the low-pressure compressed air is first output to the first low-pressure buffer tank after being absorbed and cooled by the heat accumulator, and then transferred from the first low-pressure buffer tank to the first low-pressure buffer tank. The buffer tank is output to the medium pressure piston compressor, gas storage device and air purification device respectively.

Further, the compressed air output from the air storage device is output to the air purification device after being regulated by the first pressure regulating valve and finally supplied to the test bench, or output to the air expansion unit to perform work after being regulated by the second pressure regulating valve generate electricity.

Further, the air expansion unit includes a multi-stage air expander, the compressed air is expanded from the upper-stage air expander and output to the air purification device and the next-stage air expander respectively, and the compressed air enters the next-stage air expander The compressed air output from the last stage air expander is discharged into the atmosphere, previously heated by a regenerator.

Further, the compressed air heated by the heat accumulator is regulated by the third pressure regulating valve before entering the next-stage air expander, so as to match the inlet parameters of the next-stage air expander.

Further, a sound-absorbing device is installed on the discharge pipeline.

Further, a second low-pressure buffer tank, a medium-pressure buffer tank and a high-pressure buffer tank are arranged in parallel on the exhaust pipeline of the air purification device

The present invention has following beneficial effect:

1. The system has a complete structure and is a comprehensive gas source system that can provide clean gas sources with different parameter requirements and can meet the needs of gas turbine test benches for different types of gas sources.

2. This system can realize the separate supply of low-pressure, medium-pressure and high-pressure compressed air during the compression process, and the separate supply of air between the air expanders at all levels during the process of gas expansion and work, so as to improve the utilization rate of the equipment.

3. This system can realize the storage of residual compressed air. According to the specific needs of the gas turbine test bench, without starting the air compression subsystem, it can also provide different types of air sources for the test bench through the adjustment of the first pressure regulating valve. .

4. This system can make use of the difference in peak and valley electricity prices, store compressed air during the trough, and then provide it to the test bench at different times. The remaining compressed air can be connected to the power grid through the air expansion unit to generate power, thereby improving energy utilization and recycling Partial power reduces operating costs.

5. This system can recover compression heat and equipment friction heat, and provide it to the gas expansion stage to use or provide external heat source.

Description of drawings

Fig. 1 is a work flow chart of the present invention;

In the figure: 1-power supply grid, 2-electric motor, 3-centrifugal compressor unit, 4-first low-pressure buffer tank, 5-piston compressor unit, 6-medium pressure piston compressor, 7-high pressure piston compressor , 8-regenerator, 9-gas storage device, 10-first pressure regulating valve, 11-air purification device, 12-second low-pressure buffer tank, 13-medium-pressure buffer tank, 14-high-pressure buffer tank, 15- Test bench, 16-second pressure regulating valve, 17-air expansion unit, 18-air expander, 19-third pressure regulating valve, 20-muffling device, 21-generator, 22-power grid, 23-external heat source User, 24-water storage device, 25-water pump;

1'-air intake line, 2'-first low pressure line, 3'-second low pressure line, 4'-third low pressure line, 5'-first medium pressure line, 6'-second medium pressure line, 7'-the third medium pressure pipeline, 8'-high pressure pipeline, 9'-air storage output pipeline, 10'-intake pipeline of air expander, 11'-intake pipeline of air expander, 12'-exhaust of air expander Gas pipeline, 13'-discharge pipeline, 14'-first cooling water output pipeline, 15'-second cooling water output pipeline, 16'-cooling water return pipeline.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

Please refer to Fig. 1, the present invention provides a kind of technical scheme:

An integrated air source system for a gas turbine test bench, including a motor 2, an air compression subsystem, a gas storage device 9, an air purification device 11, an air expansion unit 17, a generator 21 and a cooling water subsystem; a power supply grid 1 direction The motor 2 provides power, and the motor 2 drives the air compression subsystem to compress the ambient air into low-pressure, medium-pressure and high-pressure compressed air after being inhaled by the air intake pipeline 1'. The low-pressure and medium-pressure compressed air can be respectively output to the air storage device 9 and Air purification device 11, the high-pressure compressed air is directly output to the gas storage device 9; the compressed air in the gas storage device 9 can be output to the air purification device 11 and the air expansion unit 17 respectively, which can store low-pressure, medium-pressure and high-pressure compressed air, The gas storage device 9 can be a high-pressure container or an underground cavern; the air purification device 11 purifies and filters the compressed air of low pressure, medium pressure and high pressure and outputs it to the test bench 15 respectively, which includes a low-pressure purification component, a medium-pressure purification component and a high-pressure purification component , three different pipelines of low pressure, medium pressure and high pressure are distributed inside, which are used to remove impurities such as water and oil in the compressed air. The purification methods are not limited to molecular sieve adsorption and mechanical filtration; , the compressed air enters the air expansion unit 17 to perform work and generate electricity, and then outputs it to the air purification device 11 and discharges it into the atmosphere through the discharge pipeline 13'. The system includes a water storage device 24 and a water pump 25. The water storage device 24 can be an underground pool or a closed container, and the water pump 25 can be one or more, and its structure is not limited to one of axial flow, mixed flow or centrifugal pumps. or multiple combinations, under the action of the water pump 25, the cooling water is output along two paths, one path is output to the air compression subsystem along the first cooling water output pipeline 14' for cooling, and the other path is along the second cooling water output pipeline 15' is output to the air expansion unit 17 for cooling. The cooling water output from the air compression subsystem and the air expansion unit 17 first enters the heat accumulator 8 for heat exchange (that is, cooling), and then flows along the cooling water return line 16' Return to the water storage device 24 .

An integrated gas source system for a gas turbine test bench of the present invention also includes a heat accumulator 8, which is a heat-insulating container filled with a heat exchange medium inside, and the heat accumulator 8 is used to compress the air of the subsystem The compressed air in the air is subjected to endothermic cooling, the compressed air in the air expansion unit 17 is heated, the cooling water output from the air compression subsystem and the air expansion unit 17 is subjected to endothermic cooling before returning to the water storage device 24, and to the outside Heat source users 23 provide heat sources. The thermal energy generated during the working process of the air compression subsystem (including air compression heat and equipment friction heat) is stored in the heat accumulator 8 through heat exchange, and is used to heat the compressed air participating in the expansion and provide external heat sources.

The air compression subsystem includes a centrifugal compressor unit 3 and a piston compressor unit 5 arranged in series. The centrifugal compressor unit 3 and the piston compressor unit 5 are respectively driven by a motor 2. The centrifugal compressor unit 3 has a multi-stage structure. This embodiment only shows two stages, and the ambient air is compressed by two stages to meet the low-pressure air source requirements required by the system. The piston compressor unit 5 includes a medium-pressure piston compressor 6 and a high-pressure piston compressor connected in series. 7. The centrifugal compressor unit 3 compresses ambient air into low-pressure compressed air, and the low-pressure compressed air enters the heat accumulator 8 through the first low-pressure pipeline 2' and can be divided into three airflows after being absorbed and cooled, and one is output to the medium-pressure piston compressor 6. The other path is output to the gas storage device 9 through the second low-pressure pipeline 3', and the last path is output to the air purification device 11 through the third low-pressure pipeline 4'. The medium-pressure piston compressor 6 further compresses the incoming low-pressure compressed air into medium-pressure compressed air, and the output medium-pressure compressed air enters the heat accumulator 8 through the first medium-pressure pipeline 5' and can be divided into three paths after absorbing heat and cooling. One way of the air flow is output to the high-pressure piston compressor 7, the other way is output to the gas storage device 9 through the second medium-pressure pipeline 6', and the last way is output to the air purification device 11 through the third medium-pressure pipeline 7'. The high-pressure piston compressor 7 further compresses the incoming medium-pressure compressed air into high-pressure compressed air, and the output high-pressure compressed air enters the heat accumulator 8 through the high-pressure pipeline 8' and then directly outputs to the gas storage device 9 after absorbing heat and cooling. The gas storage device 9 is output to the air purification device 11 through the gas storage output pipeline 9 ′. Both the third low-pressure pipeline 4' and the third medium-pressure pipeline 7' are provided with pressure regulating valves and flowmeters for adjusting low-pressure and medium-pressure compressed air parameters. The low-pressure, medium-pressure and high-pressure compressed air fully contacts and exchanges heat with the heat exchange medium in the heat accumulator, and stores the compression heat in the heat accumulator.

The air compression subsystem can realize graded air supply. When only low-pressure air source is needed, the piston compressor unit 5 does not operate, and the low-pressure compressed air is only output to the air purification device 11 along the third low-pressure pipeline 4'; when low-pressure and medium-pressure When there are two kinds of gas sources, the high-pressure piston compressor 7 operates without load, and the low-pressure compressed air and medium-pressure compressed air are only output to the air purification device 11 along the third low-pressure pipeline 4' and the third medium-pressure pipeline 7' respectively; When only medium-pressure air source is needed, the high-pressure piston compressor 7 operates without load, and all the low-pressure compressed air enters the medium-pressure piston compressor 6, and the generated medium-pressure compressed air is output to the air purification along the third medium-pressure pipeline 7' Device 11; when only high-pressure air source is needed, all the low-pressure compressed air enters the medium-pressure piston compressor 6, and all the generated medium-pressure compressed air enters the high-pressure piston compressor 7, and the generated high-pressure compressed air is output to the gas storage device 9 , and output from the gas storage device 9 to the air purification device 11 through the gas storage output pipeline 9'; when two kinds of gas sources, medium pressure and high pressure, are needed, all the low-pressure compressed air enters the medium-pressure piston compressor 6, and the generated medium Part of the compressed air enters the high-pressure piston compressor 7 to generate high-pressure compressed air, and the other part is output to the air purification device 11 along the third medium-pressure pipeline 7'; The third low-pressure pipeline 4 ′ is output to the air purification device 11 , the other part enters the medium-pressure piston compressor 6 , and all the medium-pressure compressed air generated enters the high-pressure piston compressor 7 .

In order to stabilize the low-pressure compressed air, a first low-pressure buffer tank 4 is provided between the centrifugal compressor unit 3 and the piston compressor unit 5, and the low-pressure compressed air enters the heat accumulator 8 through the first low-pressure pipeline 2' to be cooled and then output to the first A low-pressure buffer tank 4 is output from the first low-pressure buffer tank 4 to the medium-pressure piston compressor 6, the gas storage device 9 and the air cleaning device 11 respectively.

The compressed air output from the gas storage device 9 is divided into two routes, one of which is output to the air purification device 11 through the gas storage output pipeline 9', and the first pressure regulating valve 10 is arranged on the gas storage output pipeline 9', through the first The pressure regulation of the pressure regulating valve 10 realizes the provision of compressed air of different pressure levels for the gas turbine test bench, and the other path is output to the air expansion unit 17 through the air expansion unit inlet pipeline 10', and the air expansion unit inlet pipeline 10' is provided with a second The second pressure regulating valve 16 is used to adjust the parameters of the compressed air to match the inlet parameters of the first-stage air expander in the air expander unit 17 . Since the system is equipped with an air storage device 9, it can supply air to the test bench without starting the air compression subsystem according to the actual demand of the test bench.

The air expansion unit 17 consists of multi-stage air expanders 18 connected in series, and this embodiment only shows a four-stage structure. The compressed air enters the first-stage air expander 18 along the air inlet pipeline 10' of the air expansion unit to expand and perform work. After expansion, it is output along two pipelines. Enter the next stage air expander 18, and the other way is output to the air purification device 11 along the air expander exhaust pipeline 12'. A third pressure regulating valve 19 is provided on the air expander intake line 11', which is used to adjust the compressed air parameters to match the inlet parameters of the air expanders 18 at all stages in the air expander unit 17. A pressure regulating valve and a flow meter are also arranged on the air expander exhaust line 12' for adjusting the parameters of the compressed air entering the air cleaning device 11. The compressed air on the exhaust pipeline 12' of the first three stages of air expander 18 can respectively control the parameters of the compressed air output to the air cleaning device 11 through the pressure regulating valve, thereby improving the utilization rate of the equipment. The compressed air output from the fourth-stage air expander 18 is discharged into the atmosphere along the discharge pipeline 13'. In order to eliminate the noise generated when the compressed air is discharged, a sound-absorbing device is installed on the discharge pipeline 13'.

In order to stabilize the compressed air at each level, a second low-pressure buffer tank 12, a medium-pressure buffer tank 13, and a high-pressure buffer tank 14 are arranged in parallel on the exhaust pipeline of the air purification device 11. The second low-pressure buffer tank 12, the medium-pressure buffer tank 13 and the high-pressure buffer tank 14 communicate with the low-pressure cleaning assembly, the medium-pressure cleaning assembly and the high-pressure cleaning assembly in the air cleaning device 11, respectively.

The present invention is a comprehensive gas source system for a gas turbine test bench with a complete structure, which is a comprehensive gas source system, can provide clean gas sources with different parameter requirements, and can meet the requirements of the gas turbine test bench for different types of gas sources. At the same time, the difference in peak and valley electricity prices can be used to store compressed air during the trough, and then provide it to the test bench for use at different times. The remaining compressed air can be generated by the air expansion unit and incorporated into the grid, thereby improving energy utilization and recovering part of the electric energy. operating costs.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or fundamentals of the present invention. The present invention can be implemented in other specific forms without any specific features. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. a kind of synthesis air supply system for test bench for gas turbine, it is characterised in that：

Including motor, air compression subsystem, caisson, air cleaning unit, air expander group, generator and cooling Water subsystem；

Motor drives air compression subsystem that surrounding air is compressed into low pressure, medium and high pressure compressed air, low pressure compression Air is exported to caisson and air cleaning unit respectively, and middle pressure compressed air is exported to caisson and air cleaning respectively Device, high pressure air is directly output to caisson, realizes classification supply；

Compressed air in caisson is exported to air cleaning unit and air expander group respectively；

Air cleaning unit will be respectively exported to testing stand after low pressure, medium and high pressure compressed air purifying, filtering；

Air expander group is connected with generator drive gear, and the expansion unit acting of compressed air air inlet generates electricity to be exported to sky simultaneously Air purifying apparatus, tail gas is discharged into air through discharge pipe line；

Cooling down water subsystem includes water storage device and water pump, respectively exports cooling water in the presence of water pump and compresses son to air System and air expander group；

Also include storage heater, for carrying out heat absorption cooling to the compressed air in air compression subsystem, to air expander group In compressed air heated, to from air compression subsystem and air expander group output cooling water carry out return water storage Heat absorption before device cools down and provides thermal source to external heat source user, and the storage heater is the internal thermal insulation for being filled with heat transferring medium Container.

2. a kind of synthesis air supply system for test bench for gas turbine according to claim 1, it is characterised in that：It is described Air compression subsystem includes the centrifugal compressor units and piston type compressed unit of arranged in series, the centrifugal compressor units For multilevel hierarchy, the piston type compressed unit includes medium and high pressure piston compressor, and the centrifugal compressor units will Surrounding air is compressed into low-pressure compressed air, and low-pressure compressed air is exported to middle pressure piston type respectively after storage heater heat absorption cooling Compressor, caisson and air cleaning unit, the middle pressure compressed air of middle pressure piston compressor output are absorbed heat through storage heater Exported respectively after cooling to high pressure piston compressor, caisson and air cleaning unit, the output of high pressure piston compressor High pressure air through storage heater heat absorption cooling after be directly output to caisson.

3. a kind of synthesis air supply system for test bench for gas turbine according to claim 2, it is characterised in that：Institute State and the first low pressure buffer tank is provided between centrifugal compressor units and piston type compressed unit, low-pressure compressed air is through storage heater First exported to the first low pressure buffer tank after heat absorption cooling, then export piston type compressed to middle pressure respectively from the first low pressure buffer tank Machine, caisson and air cleaning unit.

4. a kind of synthesis air supply system for test bench for gas turbine according to claim 3, it is characterised in that：It is described The compressed air exported in caisson exports to air cleaning unit after the first pressure regulator valve pressure regulation and is eventually fed testing stand Use, or export after the second pressure regulator valve pressure regulation and to be generated electricity to the acting of air expander group.

5. a kind of synthesis air supply system for test bench for gas turbine according to claim 4, it is characterised in that：It is described Air expander group is multilevel hierarchy, and compressed air is exported to air cleaning respectively after upper level air expander expansion work Device and next stage air expander, compressed air are heated before entering next stage air expander through storage heater, from last The compressed air of level air expander output is discharged into air.

6. a kind of synthesis air supply system for test bench for gas turbine according to claim 5, it is characterised in that：Through storing The compressed air of hot device heating before next stage air expander is entered through the 3rd pressure regulator valve pressure regulation, to match next stage air Expander inlet parameter.

7. a kind of synthesis air supply system for test bench for gas turbine according to claim 6, it is characterised in that：Institute State and silencing means is installed on discharge pipe line.

8. a kind of synthesis air supply system for test bench for gas turbine according to claim 7, it is characterised in that：In sky The second low pressure buffer tank, middle pressure surge tank and high-pressure buffering pot have been arranged in parallel on the exhaust line of air purifying apparatus.