Natural gas pressurization system of gas turbine

Abstract

The utility model relates to the technical field of gas turbines, and discloses a gas turbine natural gas pressurization system which comprises a pressurization unit, a connecting pipe group, a gas inlet pipeline, a gas outlet pipeline, a first control valve group, a second control valve group and a third control valve group. The booster unit comprises a low-pressure booster and a high-pressure booster, and the connecting pipe set comprises a first connecting pipeline, a second connecting pipeline and a third connecting pipeline. The first connecting pipeline is connected with an air inlet of the low-pressure supercharger and the air supply pipeline, the second connecting pipeline is connected with an air inlet of the high-pressure supercharger and the air supply pipeline, the third connecting pipeline is connected with an air outlet of the low-pressure supercharger and an air inlet of the high-pressure supercharger, and an air outlet of the high-pressure supercharger is communicated with the air outlet pipeline. A first control valve group is arranged on the first connecting pipeline, a second control valve group is arranged on the second connecting pipeline, and a third control valve group is arranged on the third connecting pipeline.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine technology, and in particular to a natural gas booster system for gas turbines. Background Technology

[0002] Combined cycle gas turbine power generation boasts advantages such as high thermal efficiency, rapid start-up, strong peak-shaving capability, and low pollution, making it an ideal power generation method. With the increasing installed capacity of gas turbines, the range of natural gas pressure supplied by pipelines in some regions is wide, ranging from below the minimum inlet pressure required by the gas turbine to exceeding the maximum inlet pressure limit. Therefore, a gas-fired power plant often needs both a natural gas pressure regulating station and a natural gas booster. For example, in a certain power project, the pipeline company provides natural gas pressures ranging from 15 bar.g to 66 bar.g, while the gas turbine requires a pressure of 34.1 bar.g to 47.8 bar.g. Therefore, when the incoming gas pressure is lower than the gas turbine's pressure requirement, the gas is boosted by the booster; when the incoming gas pressure is higher, the gas needs to be depressurized by the pressure regulating station.

[0003] In typical gas-fired power plants, when the incoming gas pressure ranges from exceeding the maximum to the minimum inlet pressure required by the gas turbine, a pressure regulating station and a booster compressor are typically installed within the power plant. Given the large flow rate and low pressure ratio of natural gas in gas-fired power plants, the booster compressor is usually a centrifugal type. The centrifugal booster compressor requires a constant inlet natural gas pressure to ensure that the outlet natural gas pressure meets the end-user's needs after work is performed at a specific pressure ratio, such as 45 bar·g for the gas turbine in this power generation project. Therefore, a pressure regulator or regulating valve needs to be installed before the booster compressor to stabilize the incoming gas pressure to a certain value. For example, if the pipeline inlet gas pressure ranges from 15 bar·g to 66 bar·g, the pressure before the booster compressor needs to be adjusted to 13 bar·g by the pressure regulating equipment to ensure stable operation of the booster compressor.

[0004] However, the problem with the above setup is that if the incoming gas pressure is 44 bar.g, which is only slightly lower than the required 45 bar.g, then a booster compressor must be used to pressurize it. This requires reducing the pressure from 44 bar.g to 13 bar.g and then boosting it back to 45 bar.g. This process results in a huge waste of pressure energy. Moreover, such a large pressure drop will cause a significant drop in natural gas temperature due to the Joule-Thomson effect. To prevent condensation or even pipeline ice blockage caused by natural gas falling below its dew point temperature, a heater must be installed before the pressure regulating equipment, which is very uneconomical.

[0005] Therefore, there is an urgent need for a gas turbine natural gas booster system to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a natural gas booster system for gas turbines to improve energy utilization efficiency and economy.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A gas turbine natural gas booster system includes a booster unit, a connecting pipe assembly, an incoming gas pipeline, an outgoing gas pipeline, a first control valve assembly, a second control valve assembly, and a third control valve assembly.

[0009] The booster unit includes a low-pressure booster and a high-pressure booster, and the connecting pipe assembly includes a first connecting pipe, a second connecting pipe, and a third connecting pipe;

[0010] The first connecting pipe connects the air inlet of the low-pressure booster to the air supply pipe, the second connecting pipe connects the air inlet of the high-pressure booster to the air supply pipe, the third connecting pipe connects the air outlet of the low-pressure booster to the air inlet of the high-pressure booster, and the air outlet of the high-pressure booster is connected to the air outlet pipe.

[0011] A first control valve group is provided on the first connecting pipeline, a second control valve group is provided on the second connecting pipeline, and a third control valve group is provided on the third connecting pipeline; the first control valve group includes a first shut-off valve and a first pressure regulating valve; the second control valve group includes a second shut-off valve and a second pressure regulating valve; and the third control valve group includes a third shut-off valve.

[0012] As an improvement to the above technical solution, the connecting pipe assembly further includes a fourth connecting pipe and a fifth connecting pipe;

[0013] One end of the fourth connecting pipe is connected to the first connecting pipe, and the other end is connected to the third connecting pipe. One end of the fifth connecting pipe is connected to the second connecting pipe, and the other end is connected to the air outlet pipe. A first anti-surge valve is provided on the fourth connecting pipe, and a second anti-surge valve is provided on the fifth connecting pipe.

[0014] As an improvement to the above technical solution, a first cooler is also included, which is disposed on the third connecting pipe.

[0015] As an improvement to the above technical solution, a second cooler is also included. The second cooler is disposed on the fifth connecting pipe, and the air outlet of the low-pressure booster is connected to the fourth connecting pipe via the first cooler.

[0016] As an improvement to the above technical solution, it also includes an exhaust pipe assembly, which includes a first exhaust pipe and a second exhaust pipe.

[0017] One end of the first exhaust pipe is connected to the outlet of the low-pressure booster, and one end of the second exhaust pipe is connected to the outlet of the high-pressure booster. A first exhaust valve is provided on the first exhaust pipe, and a second exhaust valve is provided on the second exhaust pipe.

[0018] As an improvement to the above technical solution, the first shut-off valve, the second shut-off valve, and the third shut-off valve are all automatic shut-off valves. The first control valve group also includes a fourth shut-off valve, the second control valve group also includes a fifth shut-off valve, and the third control valve group also includes a sixth shut-off valve. The fourth shut-off valve, the fifth shut-off valve, and the sixth shut-off valve are all manual shut-off valves.

[0019] As an improvement to the above technical solution, a fourth control valve group is also included. The fourth control valve group is provided on the gas outlet pipeline. The fourth control valve group includes a seventh shut-off valve and an eighth shut-off valve. The seventh shut-off valve is an automatic shut-off valve, and the eighth shut-off valve is a manual shut-off valve.

[0020] As an improvement to the above technical solution, multiple booster units are provided, and the connecting pipe groups are provided one-to-one with the booster units.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This utility model discloses a natural gas booster system for gas turbines. By incorporating a low-pressure booster and a high-pressure booster, it allows for selective supply of incoming natural gas to the gas turbine via either a first connecting pipeline, the low-pressure booster, the high-pressure booster, and the outlet pipeline, or via a second connecting pipeline, the high-pressure booster, and the outlet pipeline, depending on the incoming gas pressure. This avoids the situation where the incoming natural gas pressure is high but must first be reduced to a very low pressure before being boosted, significantly reducing energy waste. Furthermore, the significantly reduced pressure reduction leads to a much smaller cooling effect, correspondingly lowering the cost of the pre-heater. This improves energy utilization and the economic efficiency of the natural gas booster system for gas turbines. Attached Figure Description

[0023] Figure 1 This is a system diagram of the gas turbine natural gas booster system provided in this embodiment of the utility model;

[0024] Figure 2 This is a system diagram of the booster line of the gas turbine natural gas booster system provided in this embodiment of the utility model.

[0025] In the picture:

[0026] 11. Booster compressor unit; 111. Low-pressure booster compressor; 112. High-pressure booster compressor;

[0027] 12. Connecting pipe assembly; 121. First connecting pipe; 122. Second connecting pipe; 123. Third connecting pipe; 124. Fourth connecting pipe; 1241. First anti-surge valve; 125. Fifth connecting pipe; 1251. Second anti-surge valve;

[0028] 13. Gas supply line;

[0029] 14. Air outlet pipe;

[0030] 15. First control valve assembly; 151. First shut-off valve; 152. First pressure regulating valve; 153. Fourth shut-off valve;

[0031] 16. Second control valve assembly; 161. Second shut-off valve; 162. Second pressure regulating valve; 163. Fifth shut-off valve;

[0032] 17. Third control valve assembly; 171. Third shut-off valve; 172. Sixth shut-off valve; 173. First check valve;

[0033] 18. First cooler;

[0034] 19. Second cooler;

[0035] 20. Exhaust pipe assembly;

[0036] 201, First exhaust pipe; 2011, First exhaust valve; 202, Second exhaust pipe; 2021, Second exhaust valve;

[0037] 21. Fourth control valve assembly; 211. Seventh shut-off valve; 212. Eighth shut-off valve; 213. Second check valve;

[0038] 100. First stage of boosting; 200. Second stage of boosting. Detailed Implementation

[0039] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] like Figure 1 and Figure 2As shown, this embodiment provides a natural gas booster system for a gas turbine, used for boosting the incoming natural gas from the gas turbine. The natural gas booster system includes a booster unit 11, a connecting pipe assembly 12, an incoming gas pipeline 13, an outlet gas pipeline 14, a first control valve assembly 15, a second control valve assembly 16, and a third control valve assembly 17. The booster unit 11 includes a low-pressure booster 111 and a high-pressure booster 112. The connecting pipe assembly 12 includes a first connecting pipe 121, a second connecting pipe 122, and a third connecting pipe 123. The first connecting pipe 121 connects the inlet of the low-pressure booster 111 to the incoming gas pipeline 13; the second connecting pipe 122 connects the inlet of the high-pressure booster 112 to the incoming gas pipeline 13; the third connecting pipe 123 connects the outlet of the low-pressure booster 111 and the inlet of the high-pressure booster 112; and the outlet of the high-pressure booster 112 is connected to the outlet gas pipeline 14. A first control valve assembly 15 is provided on the first connecting pipe 121, a second control valve assembly 16 is provided on the second connecting pipe 122, and a third control valve assembly 17 is provided on the third connecting pipe 123. The first control valve assembly 15 includes a first shut-off valve 151 and a first pressure regulating valve 152. The second control valve assembly 16 includes a second shut-off valve 161 and a second pressure regulating valve 162. The third control valve assembly 17 includes a third shut-off valve 171.

[0044] The gas turbine natural gas booster system provided in this embodiment can control the opening and closing of the first connecting pipe 121 through the first control valve group 15, control the opening and closing of the second connecting pipe 122 through the second control valve group 16, and control the opening and closing of the third connecting pipe 123 through the third control valve group 17. Therefore, when the gas pressure in the gas pipeline 13 is lower than the first set pressure but higher than the second set pressure, the second connecting pipeline 122 is disconnected by the second shut-off valve 161. The first shut-off valve 151 and the third shut-off valve 171 control the connection between the first connecting pipeline 121 and the third connecting pipeline 123. The gas pressure in the gas pipeline 13 is reduced to the second set pressure by the first pressure regulating valve 152. Since the second set pressure is lower than the first set pressure, the natural gas after the pressure reduction enters the low-pressure booster 111 for a first-stage booster pressurization to the first set pressure. Then, it enters the high-pressure booster 112 through the third connecting pipeline 123 for a second-stage booster pressurization to the third set pressure. The natural gas after the second-stage booster pressurization can be supplied to the gas turbine through the gas outlet pipeline 14. When the incoming natural gas pressure in the gas pipeline 13 is higher than the first set pressure but lower than the third set pressure, the first connecting pipeline 121 is disconnected by the first shut-off valve 151, and the second shut-off valve 161 and the third shut-off valve 171 control the connection between the second connecting pipeline 122 and the third connecting pipeline 123. The incoming gas pressure in the gas pipeline 13 is reduced to the first set pressure by the second pressure regulating valve 162. The natural gas with reduced pressure enters the high-pressure booster 112 and is pressurized to the third set pressure. The pressurized natural gas can be supplied to the gas turbine through the gas outlet pipeline 14.

[0045] In this embodiment, the natural gas booster system for the gas turbine, by setting up a low-pressure booster 111 and a high-pressure booster 112, allows for the selection of whether to supply natural gas to the gas turbine via the first connecting pipeline 121, the low-pressure booster 111, the high-pressure booster 112, and the outlet pipeline 14, or via the second connecting pipeline 122, the high-pressure booster 112, and the outlet pipeline 14, depending on the incoming gas pressure from the gas pipeline 13. This avoids the situation where the incoming natural gas pressure is high but it must first be depressurized to a very low pressure before being boosted again, greatly reducing energy waste. Furthermore, the significantly reduced pressure reduction leads to a significantly reduced cooling effect, and the cost of the pre-heater is correspondingly lower. This improves energy utilization and the economic efficiency of the natural gas booster system for the gas turbine.

[0046] For example, in this embodiment, the first set pressure is 33 bar.g, the second set pressure is 10 bar.g, and the third set pressure is 45 bar.g. When the gas pressure in the gas pipeline 13 is below 33 bar.g, both the first shut-off valve 151 and the third shut-off valve 171 are opened, the second shut-off valve 161 is closed, and the first pressure regulating valve 152 is opened to regulate the pressure. This allows the natural gas to first pass through the first pressure regulating valve 152 and have its pressure reduced to 10 bar.g, then pass through the low-pressure booster 111 and be pressurized to 33 bar.g, and then enter the high-pressure booster 112 to be pressurized to the 45 bar.g required by the gas turbine before being sent to the gas outlet pipeline 14. When the incoming gas pressure in gas pipeline 13 is above 33 bar.g, the first shut-off valve 151 at the inlet of the low-pressure booster 111 closes, while the second shut-off valve 161 on the second connecting pipeline 122 and the third shut-off valve 171 on the third connecting pipeline 123 open. This allows the natural gas to first be depressurized to 33 bar.g by the second pressure regulating valve 162 before entering the high-pressure booster 112. The high-pressure booster 112 then boosts the natural gas pressure to the 45 bar.g required by the gas turbine before sending it into the outlet pipeline 14. Here, 33 bar.g is the rated pressure of the incoming gas pipeline 13. The above-described configuration in this embodiment minimizes the plant's power consumption when the incoming gas pressure is at the rated pressure.

[0047] Optionally, such as Figure 2 As shown, the gas turbine natural gas booster system provided in this embodiment also includes a first cooler 18, which is disposed on the third connecting pipeline 123. Since the temperature of natural gas increases after being boosted by the low-pressure booster 111, affecting the boosting efficiency of the high-pressure booster 112, a first cooler 18 is disposed on the third connecting pipeline 123 in this embodiment to cool the flowing natural gas before supplying it to the high-pressure booster 112. In this embodiment, the first cooler 18 is an air cooler, which is a prior art device, and its structure and features will not be described in detail here.

[0048] Optionally, such as Figure 2 As shown, the connecting pipe assembly 12 also includes a fourth connecting pipe 124 and a fifth connecting pipe 125. One end of the fourth connecting pipe 124 is connected to the first connecting pipe 121, and the other end is connected to the third connecting pipe 123. One end of the fifth connecting pipe 125 is connected to the second connecting pipe 122, and the other end is connected to the gas outlet pipe 14. A first anti-surge valve 1241 is installed on the fourth connecting pipe 124, and a second anti-surge valve 1251 is installed on the fifth connecting pipe 125. The fourth connecting pipe 124 connects the outlet and inlet of the low-pressure booster 111, and the fifth connecting pipe 125 connects the outlet and inlet of the high-pressure booster 112. Thus, when the gas turbine's required flow rate is low, excess natural gas is circulated through the fourth connecting pipe 124 and the fifth connecting pipe 125, preventing the low-pressure booster 111 and the high-pressure booster 112 from entering the low-flow surge zone. Anti-surge valves are existing devices in this field, and their structure and principle will not be described in detail here.

[0049] Furthermore, such as Figure 2 As shown, the outlet of the low-pressure booster 111 is connected to the fourth connecting pipe 124 via the first cooler 18. This allows excess natural gas to be cooled by the first cooler 18 after flowing out of the outlet of the low-pressure booster 111, and then circulated through the fourth connecting pipe 124, preventing the temperature of the excess natural gas from becoming too high during the circulation process through the fourth connecting pipe 124.

[0050] Furthermore, such as Figure 2 As shown, the gas turbine natural gas booster system provided in this embodiment also includes a second cooler 19, which is disposed on the fifth connecting pipe 125. This allows excess natural gas flowing from the outlet of the high-pressure booster 112 into the fifth connecting pipe 125 for circulation to be cooled by the second cooler 19, preventing the natural gas from becoming too hot during circulation. In this embodiment, the second cooler 19 is an air cooler.

[0051] Optionally, such as Figure 2 As shown, the natural gas booster system for a gas turbine provided in this embodiment also includes an exhaust pipe assembly 20, which includes a first exhaust pipe 201 and a second exhaust pipe 202. One end of the first exhaust pipe 201 is connected to the outlet of the low-pressure booster 111, and one end of the second exhaust pipe 202 is connected to the outlet of the high-pressure booster 112. A first exhaust valve 2011 is provided on the first exhaust pipe 201, and a second exhaust valve 2021 is provided on the second exhaust pipe 202. The exhaust pipe assembly 20, together with the first exhaust valve 2011 and the second exhaust valve 2021, provides protection for the system. The exhaust valves are existing devices in the art, and their structure and principle will not be described in detail here.

[0052] Optionally, such as Figure 2 As shown, the first shut-off valve 151, the second shut-off valve 161, and the third shut-off valve 171 are all automatic shut-off valves, which facilitate automatic control. The first control valve group 15 also includes a fourth shut-off valve 153, the second control valve group 16 also includes a fifth shut-off valve 163, and the third control valve group 17 also includes a sixth shut-off valve 172. The fourth shut-off valve 153, the fifth shut-off valve 163, and the sixth shut-off valve 172 are all manual shut-off valves. The manual shut-off valves serve as backups for the automatic shut-off valves, allowing for manual shut-off of the first connecting pipe 121, the second connecting pipe 122, and the third connecting pipe 123 when necessary.

[0053] Furthermore, such as Figure 2 As shown, the third control valve assembly 17 also includes a first check valve 173 for preventing backflow of natural gas in the third connecting pipeline 123. The check valve is an existing device in the art, and its structure and principle will not be described in detail here.

[0054] Optionally, such as Figure 2 As shown, the gas turbine natural gas booster system provided in this embodiment also includes a fourth control valve group 21. The fourth control valve group 21 is installed on the gas outlet pipeline 14. The fourth control valve group 21 includes a seventh shut-off valve 211 and an eighth shut-off valve 212. The seventh shut-off valve 211 is an automatic shut-off valve, and the eighth shut-off valve 212 is a manual shut-off valve. The gas outlet pipeline 14 is controlled by the seventh shut-off valve 211 and the eighth shut-off valve 212.

[0055] Furthermore, such as Figure 2 As shown, the fourth control valve assembly 21 also includes a second check valve 213 to prevent backflow of natural gas in the gas outlet pipeline 14. The check valve is a prior art device, and its structure and principle will not be described here.

[0056] Optionally, such as Figure 1 As shown, multiple booster units 11 are provided, and connecting pipe groups 12 are provided one-to-one with booster units 11. In this embodiment, four booster units 11 are provided, and each booster unit 11 and its corresponding pipelines and equipment form a booster line. That is to say, the gas turbine natural gas booster system in this embodiment has four booster lines, each booster line corresponding to the capacity of one gas turbine, and three of the four booster lines are used and one is a spare.

[0057] The gas turbine natural gas booster system provided in this embodiment, such as Figure 1As shown, each booster line is configured in stages. Each booster line is divided into a first-stage booster section 100 and a second-stage booster section 200. When supplying gas to each gas turbine, the gas turbine natural gas booster system selects whether to supply the gas to the gas turbine through the first-stage booster section 100 and the second-stage booster section 200, or to directly boost the gas in the second-stage booster section 200 before supplying it to the gas turbine, based on the incoming gas pressure. This reduces the pressure energy loss when the incoming gas is regulated by the pressure regulating valve, thereby improving the energy utilization efficiency of the system.

[0058] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A natural gas booster system for a gas turbine, characterized in that, It includes a booster unit (11), a connecting pipe assembly (12), an incoming air pipeline (13), an outgoing air pipeline (14), a first control valve assembly (15), a second control valve assembly (16), and a third control valve assembly (17); The booster unit (11) includes a low-pressure booster (111) and a high-pressure booster (112), and the connecting pipe group (12) includes a first connecting pipe (121), a second connecting pipe (122) and a third connecting pipe (123); The first connecting pipe (121) connects the air inlet of the low-pressure booster (111) to the air supply pipe (13), the second connecting pipe (122) connects the air inlet of the high-pressure booster (112) to the air supply pipe (13), the third connecting pipe (123) connects the air outlet of the low-pressure booster (111) and the air inlet of the high-pressure booster (112), and the air outlet of the high-pressure booster (112) is connected to the air outlet pipe (14); A first control valve group (15) is provided on the first connecting pipe (121), a second control valve group (16) is provided on the second connecting pipe (122), and a third control valve group (17) is provided on the third connecting pipe (123). The first control valve group (15) includes a first shut-off valve (151) and a first pressure regulating valve (152). The second control valve group (16) includes a second shut-off valve (161) and a second pressure regulating valve (162). The third control valve group (17) includes a third shut-off valve (171).

2. The gas turbine natural gas booster system according to claim 1, characterized in that, The connecting pipe assembly (12) further includes a fourth connecting pipe (124) and a fifth connecting pipe (125); One end of the fourth connecting pipe (124) is connected to the first connecting pipe (121), and the other end is connected to the third connecting pipe (123). One end of the fifth connecting pipe (125) is connected to the second connecting pipe (122), and the other end is connected to the air outlet pipe (14). A first anti-surge valve (1241) is provided on the fourth connecting pipe (124), and a second anti-surge valve (1251) is provided on the fifth connecting pipe (125).

3. The gas turbine natural gas booster system according to claim 2, characterized in that, It also includes a first cooler (18), which is disposed on the third connecting pipe (123).

4. The gas turbine natural gas booster system according to claim 3, characterized in that, It also includes a second cooler (19), which is disposed on the fifth connecting pipe (125), and the outlet of the low-pressure booster (111) is connected to the fourth connecting pipe (124) via the first cooler (18).

5. The gas turbine natural gas booster system according to claim 1, characterized in that, It also includes an exhaust pipe assembly (20), which includes a first exhaust pipe (201) and a second exhaust pipe (202); One end of the first exhaust pipe (201) is connected to the outlet of the low-pressure booster (111), and one end of the second exhaust pipe (202) is connected to the outlet of the high-pressure booster (112). A first exhaust valve (2011) is provided on the first exhaust pipe (201), and a second exhaust valve (2021) is provided on the second exhaust pipe (202).

6. The gas turbine natural gas booster system according to claim 1, characterized in that, The first shut-off valve (151), the second shut-off valve (161) and the third shut-off valve (171) are all automatic shut-off valves. The first control valve group (15) also includes a fourth shut-off valve (153). The second control valve group (16) also includes a fifth shut-off valve (163). The third control valve group (17) also includes a sixth shut-off valve (172). The fourth shut-off valve (153), the fifth shut-off valve (163) and the sixth shut-off valve (172) are all manual shut-off valves.

7. The gas turbine natural gas booster system according to claim 1, characterized in that, It also includes a fourth control valve group (21), which is provided on the gas outlet pipeline (14). The fourth control valve group (21) includes a seventh shut-off valve (211) and an eighth shut-off valve (212). The seventh shut-off valve (211) is an automatic shut-off valve, and the eighth shut-off valve (212) is a manual shut-off valve.

8. The gas turbine natural gas booster system according to any one of claims 1-7, characterized in that, Multiple booster units (11) are provided, and the connecting pipe groups (12) are provided one-to-one with the booster units (11).

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