CN216518290U - Waste heat recovery device of gas turbine - Google Patents
Waste heat recovery device of gas turbine Download PDFInfo
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- CN216518290U CN216518290U CN202123031383.3U CN202123031383U CN216518290U CN 216518290 U CN216518290 U CN 216518290U CN 202123031383 U CN202123031383 U CN 202123031383U CN 216518290 U CN216518290 U CN 216518290U
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Abstract
The utility model relates to a waste heat recovery device of a gas turbine, which comprises an air pressure regulating device, the gas turbine, a turbine and a heat exchanger, wherein natural gas of a first branch circuit is subjected to pressure regulation through the air pressure regulating device and is input into the gas turbine to perform combustion work, waste gas output from the gas turbine passes through the heat exchanger, natural gas of a second branch circuit is input into the heat exchanger to be heated, the natural gas output from the heat exchanger is input into the turbine to perform work, and the heat exchanger is a gas-gas heat exchanger. According to the technical scheme provided by the utility model, the heat exchanger for directly exchanging heat between gas and gas is utilized, so that the whole system thoroughly gets rid of the requirement on process water, the heat exchange efficiency is improved, and the aim of more efficiently recovering energy is fulfilled.
Description
Technical Field
The utility model belongs to the technical field of gas turbines, and particularly relates to a waste heat recovery device of a gas turbine.
Background
At present, natural gas long-distance pipelines in the world are all conveyed at high pressure, and most of the conveying pressure of foreign long-distance pipelines is over 10 MPa. The long-distance pipeline of natural gas in China also adopts high-pressure transportation, and the gas transportation pressure of 'west gas east transportation' and 'Shaan-Jing second line' and the like can reach more than 10 MPa. The upstream natural gas is delivered to each city or large-scale user through a high-pressure pipe network, and is delivered to the user for use after being depressurized to about 0.4MPa through natural gas pressure regulating stations in various places. The pressure regulating station generally adopts a pressure regulating valve to reduce the pressure, so that the pressure of a pipe network cannot be recycled; as the pressure of the natural gas decreases, a large amount of energy is lost.
The current common pressure energy recycling modes comprise two major types of pressure energy power generation and pressure energy refrigeration. When the high-pressure natural gas is expanded through a turbine to do work (isentropic expansion), the temperature is reduced along with the reduction of the pressure. If the pressure drop is large, the outlet temperature of the turbine is easy to be too low, natural gas is easy to liquefy, so that the turbine generates binary flow, and the performance of the turbine is difficult to control; if the pressure drop is small, the turbine is inefficient. Therefore, supplemental heating of the natural gas is typically required before it can reenter the turbine expander to produce work.
The gas-steam combined cycle generator set is called CCPP for short. The gas turbine compresses air through the gas compressor turbine, and high-pressure air is mixed with fuel and combusted in the combustion chamber, so that the air expands rapidly to do work, and the power turbine is pushed to rotate to do work to drive the generator to generate electricity. The self power generation efficiency of the gas turbine is not high, and is generally about 30-40%. However, the temperature of waste heat flue gas generated by the gas turbine reaches 450-550 ℃, heat energy can be recovered again through the waste heat boiler to be converted into steam, the steam turbine is driven to generate electricity once again, and therefore gas turbine-steam turbine combined cycle power generation is formed, and the power generation efficiency can reach 60%.
The prior art also discloses a gas turbine and gas combined cycle process, which utilizes gas turbine flue gas to heat water, and then heats high-pressure cold natural gas by water, so that the high-pressure cold natural gas is expanded by a turbine to do work. In this process, water is used as a heat exchange medium. Compared with the traditional CCPP process, the process system still needs process water; the system exchanges heat twice, and both gas and liquid exchange heat, so that the heat exchange efficiency is low.
SUMMERY OF THE UTILITY MODEL
In order to solve all or part of the problems, the utility model aims to provide a waste heat recovery device of a gas turbine, which simplifies the system structure and improves the heat exchange efficiency.
The utility model provides a waste heat recovery device of a gas turbine, which comprises an air pressure adjusting device, the gas turbine, a turbine and a heat exchanger, wherein natural gas of a first branch is subjected to pressure regulation through the air pressure adjusting device and is input into the gas turbine to be combusted and work, waste gas output from the gas turbine passes through the heat exchanger, natural gas of a second branch is input into the heat exchanger to be heated, the natural gas output from the heat exchanger is input into the turbine to work, and the heat exchanger is a gas-gas heat exchanger.
Optionally, the system further comprises a first generator, the gas turbine is in driving connection with the first generator, and the gas turbine drives the first generator to generate electricity.
Optionally, the first generator is a dual-input shaft generator, the turbine is in driving connection with the first generator, and the gas turbine and the turbine simultaneously drive the first generator to generate electricity.
Optionally, a first clutch is disposed between the gas turbine and the first generator, and a second clutch is disposed between the turbine and the first generator.
Optionally, the power generation system further comprises a second generator, the turbine is in driving connection with the second generator, and both the first generator and the second generator are single-input-shaft generators.
Optionally, a first clutch is disposed between the gas turbine and the first generator, and a second clutch is disposed between the turbine and the second generator.
Optionally, the gas pressure regulating device comprises a pressure reducing valve through which the natural gas of the first branch is depressurized.
Optionally, the gas pressure regulating device comprises a compressor, through which the natural gas of the first branch is pressurized.
Optionally, the system further comprises a medium-low temperature waste heat recovery system, the medium-low temperature waste heat recovery system is connected with the heat exchanger through a pipeline, and waste gas output from the heat exchanger is subjected to waste heat recovery through the medium-low temperature waste heat recovery system.
Optionally, the system further comprises cold energy preparation equipment, wherein the cold energy preparation equipment is connected with the turbine through a pipeline, and the natural gas output from the turbine is subjected to cold energy preparation through the cold energy preparation equipment.
According to the technical scheme, the waste heat recovery device of the gas turbine has the following advantages:
the gas and the gas are adopted for direct heat exchange, so that the heat exchange efficiency is improved, and the energy is recovered more efficiently.
The system thoroughly gets rid of the requirement on process water, so that the operation cost can be reduced, and the system is more environment-friendly.
The heat exchange of the system is changed from twice heat exchange into once heat exchange, so that the number of heat exchangers is reduced, and the heat loss is reduced, and the loss is increased because the heat exchange process is increased.
Drawings
FIG. 1 is a schematic structural diagram of a waste heat recovery device of a gas turbine in embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a waste heat recovery device of a gas turbine in embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a gas turbine waste heat recovery device in embodiment 3 of the present invention.
Description of reference numerals: 1. a natural gas source; 2. an air pressure adjusting device; 3. a gas turbine; 4. a first clutch; 5. a first generator; 6. a second generator; 7. a second clutch; 8. a turbine; 9. a heat exchanger; 10. a medium-low temperature waste heat recovery system; 11. cold energy preparation equipment.
Detailed Description
For better understanding of the objects, structure and functions of the present invention, a gas turbine waste heat recovery device of the present invention will be described in further detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, an embodiment 1 of the present invention discloses a gas turbine waste heat recovery device, which includes an air pressure adjusting device 2, a gas turbine 3, a turbine 8, and a heat exchanger 9, wherein a first branch of natural gas is subjected to pressure adjustment by the air pressure adjusting device 2, is input into the gas turbine 3 to perform combustion work, an exhaust gas output from the gas turbine 3 passes through the heat exchanger 9, a second branch of natural gas is input into the heat exchanger 9 to perform heating, a natural gas output from the heat exchanger 9 is input into the turbine 8 to perform work, and the heat exchanger 9 is a gas-gas heat exchanger.
Different gas flow pipelines are arranged in the heat exchanger 9, natural gas and waste gas output by the gas turbine 3 are respectively circulated, heat exchange is realized in the circulation process, and the whole system thoroughly gets rid of the requirement on process water by utilizing the heat exchanger 9 for directly exchanging heat between gas and gas; the heat exchanger directly exchanges heat with gas by adopting gas, so that not only is one heat exchanger reduced, but also the heat exchange efficiency is improved, and the purpose of recovering energy more efficiently is achieved.
As shown in fig. 1, the gas turbine waste heat recovery device further includes a first generator 5, the gas turbine 3 is in driving connection with the first generator 5, and the gas turbine 3 drives the first generator 5 to generate electricity.
In the present embodiment, the first generator 5 is a dual-input shaft generator, the turbine 8 is in driving connection with the first generator 5, and the gas turbine 3 and the turbine 8 simultaneously drive the first generator 5 to generate electricity.
The first generator 5 is a brush generator, allowing two input shafts. The two input shafts are distributed at both ends of the fuselage, and the gas turbine 3 and the turbine 8 are distributed at both ends of the first generator 5, respectively.
For the drive connection, a first clutch 4 is arranged between the gas turbine 3 and the first generator 5, and a second clutch 7 is arranged between the turbine 8 and the first generator 5. Preferably, a transmission clutch or an overrunning clutch is adopted as each of the first clutch 4 and the second clutch 7.
The natural gas that follows natural gas source 1 and carry is high pressure, microthermal natural gas usually, and at this moment, atmospheric pressure adjusting device 2 includes the relief pressure valve, and the natural gas of first branch road is stepped down through the relief pressure valve, and the output is suitable for the pressure natural gas and is supplied gas turbine 3 to use.
If the natural gas delivered from the natural gas source 1 is at a low pressure, the pressure regulating device 2 includes a compressor, and the natural gas in the first branch is pressurized by the compressor to output a natural gas with a proper pressure for the gas turbine 3.
The gas enters the gas turbine 3 after pressure adjustment according to the pressure of the natural gas source, and is used as fuel of the gas turbine 3. The air is filtered by an air filter, compressed and pressurized by the compressor part of the gas turbine 3, and then combusted with the raw material natural gas to generate high-temperature and high-pressure gas. The gas works through the turbine of the gas turbine, pushing the first generator 5 to do work. The high-temperature tail gas discharged by the gas turbine 3 exchanges heat with the other path of high-pressure low-temperature natural gas in the heat exchanger 9 to heat the high-pressure natural gas. The formed high-temperature and high-pressure natural gas works through the turbine 8, and the gas drives the first generator 5 connected with the turbine 8 to work in the pressure reduction and temperature reduction processes.
The gas turbine waste heat recovery device provided by the embodiment has the following advantages:
the gas and the gas are adopted for direct heat exchange, so that the heat exchange efficiency is improved, and the energy is recovered more efficiently.
The system thoroughly gets rid of the requirement on process water, so that the operation cost can be reduced, and the system is more environment-friendly.
The heat exchange of the system is changed from twice heat exchange into once heat exchange, so that the number of heat exchangers is reduced, and the heat loss is reduced, and the loss is increased because the heat exchange process is increased.
Example 2
As shown in fig. 2, an embodiment 2 of the present invention is different from embodiment 1 in that: the power generation device also comprises a second generator 6, the turbine 8 is in driving connection with the second generator 6, and the first generator 5 and the second generator 6 are both single-input-shaft generators.
A first clutch 4 is arranged between the gas turbine 3 and the first generator 5, and a second clutch 7 is arranged between the turbine 8 and the second generator 6.
The first and second generators 5, 6 may be brushless generators, allowing for an input shaft.
The gas enters the gas turbine 3 after pressure adjustment according to the pressure of the natural gas source, and is used as fuel of the gas turbine 3. The air is filtered by an air filter, compressed and pressurized by the compressor part of the gas turbine 3, and then combusted with the raw material natural gas to generate high-temperature and high-pressure gas. The gas works through the turbine of the gas turbine, pushing the first generator 5 to do work. The high-temperature tail gas discharged by the gas turbine 3 exchanges heat with the other path of high-pressure low-temperature natural gas in the heat exchanger 9 to heat the high-pressure natural gas. The formed high-temperature and high-pressure natural gas works through the turbine 8, and the gas drives the second generator 6 connected with the turbine 8 to work in the pressure reduction and temperature reduction processes.
The other structural arrangements of the gas turbine waste heat recovery device in the present embodiment are the same as those in embodiment 1, and will not be described in detail here.
Example 3
As shown in fig. 3, an embodiment 3 of the present invention is different from embodiment 1 in that: the waste gas heat recovery system further comprises a medium-low temperature waste heat recovery system 10, the medium-low temperature waste heat recovery system 10 is connected with the heat exchanger 9 through a pipeline, and waste gas output from the heat exchanger 9 is subjected to waste heat recovery through the medium-low temperature waste heat recovery system 10.
The natural gas cold energy production system further comprises cold energy production equipment 11, the cold energy production equipment 11 is connected with the turbine 8 through a pipeline, and the natural gas output from the turbine 8 is subjected to cold energy production through the cold energy production equipment 11.
By using the low-temperature flue gas discharged by the heat exchanger 9, a low-temperature waste heat recovery process, such as ORC (organic rankine cycle) and Kalina (Kalina cycle), can be considered again according to actual conditions. When the exhaust temperature of the turbine 8 is low, the discharged low-temperature normal-pressure natural gas is used for preparing cold energy, and the utilization efficiency of energy is further improved.
The other structural arrangements of the gas turbine waste heat recovery device in the present embodiment are the same as those in embodiment 1, and will not be described in detail here.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the utility model pertains.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the utility model not be limited to the particular embodiments disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The utility model provides a gas turbine waste heat recovery device, includes air pressure adjusting device, gas turbine, turbine and heat exchanger, its characterized in that, the natural gas process of first branch road the air pressure adjusting device pressure regulating is imported the gas turbine burning does work, follows the waste gas of gas turbine output passes through the heat exchanger, the natural gas input of second branch road heat in the heat exchanger, follow the natural gas input of output in the heat exchanger the turbine does work, the heat exchanger is the gas heat exchanger.
2. The gas turbine waste heat recovery device of claim 1, further comprising a first generator, wherein the gas turbine is in driving connection with the first generator, and the gas turbine drives the first generator to generate electricity.
3. The gas turbine waste heat recovery device of claim 2, wherein the first generator is a dual input shaft generator, the turbine is in driving connection with the first generator, and the gas turbine and the turbine simultaneously drive the first generator to generate electricity.
4. The gas turbine waste heat recovery device of claim 3, wherein a first clutch is disposed between the gas turbine and the first generator, and a second clutch is disposed between the turbine and the first generator.
5. The gas turbine waste heat recovery device of claim 2, further comprising a second generator, wherein the turbine is in driving connection with the second generator, and the first generator and the second generator are both single-input-shaft generators.
6. The gas turbine waste heat recovery device of claim 5, wherein a first clutch is disposed between the gas turbine and the first generator, and a second clutch is disposed between the turbine and the second generator.
7. The gas turbine waste heat recovery device of claim 1, wherein the air pressure regulating device comprises a pressure reducing valve through which the natural gas of the first branch is depressurized.
8. The gas turbine waste heat recovery device of claim 1, wherein the air pressure regulating device includes a compressor through which the first branch of natural gas is pressurized.
9. The gas turbine waste heat recovery device of claim 1, further comprising a medium-low temperature waste heat recovery system, wherein the medium-low temperature waste heat recovery system is connected with the heat exchanger through a pipeline, and waste gas output from the heat exchanger is subjected to waste heat recovery through the medium-low temperature waste heat recovery system.
10. The gas turbine waste heat recovery device according to claim 1, further comprising a cold energy preparation facility that is connected to the turbine through a pipeline, and the natural gas output from the turbine is subjected to cold energy preparation by the cold energy preparation facility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123031383.3U CN216518290U (en) | 2021-12-02 | 2021-12-02 | Waste heat recovery device of gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123031383.3U CN216518290U (en) | 2021-12-02 | 2021-12-02 | Waste heat recovery device of gas turbine |
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| Publication Number | Publication Date |
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| CN216518290U true CN216518290U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123031383.3U Active CN216518290U (en) | 2021-12-02 | 2021-12-02 | Waste heat recovery device of gas turbine |
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2021
- 2021-12-02 CN CN202123031383.3U patent/CN216518290U/en active Active
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