Combustible gas exhaust system and shield tunneling machine

Abstract

The present application relates to a combustible gas exhaust system and a shield tunneling machine, the combustible gas exhaust system comprising: a separator (6) comprising an inlet communicated with an excavation chamber of the shield tunneling machine to introduce combustible gas, a first outlet outputting mud and / or water separated from the combustible gas, and a second outlet outputting the separated combustible gas; and a release device (29) comprising a container, a first inlet provided on the container and communicated with the second outlet of the separator (6) to introduce the combustible gas, a second inlet provided on the container and used to introduce a diluent of the combustible gas, and a first outlet provided on an upper portion of the container and used to output the diluted combustible gas.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) technology, and more specifically, to a combustible gas venting system and a TBM. Background Technology

[0002] During tunnel boring machine (TBM) construction, the confined working space allows harmful and toxic gases to easily accumulate. Common harmful and toxic gases include carbon monoxide and hydrogen sulfide. At the same time, combustible gases in the excavation chamber should not be ignored. Combustible gases are typically generated in soil layers containing organic matter, produced by the decomposition of organic matter by bacteria in an anaerobic environment. The content of combustible gases is related to the organic matter content in the soil layer. Therefore, the detection of combustible gases in the TBM's excavation chamber is essential. When excessive levels of combustible gases are detected, appropriate and effective measures should be taken promptly to ensure the safety of personnel and construction. Therefore, the discharge of combustible gases from the excavation chamber is particularly necessary. Summary of the Invention

[0003] The present invention aims to provide a combustible gas venting system and a tunnel boring machine to solve the problem of combustible gas in the excavation chamber affecting operators and construction safety in the prior art.

[0004] According to one aspect of the present invention, a combustible gas venting system is provided, the system comprising:

[0005] The separator includes an inlet connected to the excavation chamber of the tunnel boring machine to introduce combustible gas, a first outlet for discharging mud and / or water separated from the combustible gas, and a second outlet for discharging the separated combustible gas.

[0006] The release device includes a container, a first inlet disposed on the container and connected to a second outlet of a separator for introducing combustible gas, a second inlet disposed on the container for introducing a medium for diluting the combustible gas, and a first outlet disposed on the upper part of the container for discharging the diluted combustible gas.

[0007] In some embodiments, including:

[0008] The combustible gas flow path extends from the excavation chamber to the release device, and includes a separator and a release device arranged sequentially along the combustible gas flow direction;

[0009] A valve is provided in a combustible gas flow path to divide the combustible gas flow path into at least two unconnected combustible gas flow paths when closed.

[0010] The cleaning pipeline is connected to the combustible gas flow path to deliver the cleaning medium to one segment of the segmented combustible gas flow path.

[0011] In some embodiments, the cleaning pipeline includes:

[0012] The cleaning liquid pipeline is connected to the combustible gas flow path to deliver the cleaning liquid into the combustible gas flow path;

[0013] Compressed gas pipelines are provided in a one-to-one correspondence with cleaning liquid pipelines. The compressed gas pipelines and the corresponding cleaning liquid pipelines are connected to the same combustible gas flow path to provide compressed gas for cleaning the combustible gas flow path together with the cleaning liquid, or to provide compressed gas for cleaning the combustible gas pipeline.

[0014] In some embodiments,

[0015] The valve includes a first valve and a second valve arranged sequentially between the inlet of the excavation chamber and the separator along the direction of combustible gas flow, with the first valve located upstream of the second valve in the direction of combustible gas flow.

[0016] The cleaning pipeline includes a first cleaning pipeline, which is connected to the combustible gas flow path between the first valve and the second valve, to clean the first valve and / or the pipeline between the first valve and the excavation chamber after the second valve is closed.

[0017] In some embodiments, the valve includes a first valve located upstream of the inlet of the separator along the flow direction of the combustible gas and a third valve located downstream of the second outlet of the separator along the flow direction of the combustible gas.

[0018] The cleaning pipeline includes a first cleaning pipeline, which is connected to the combustible gas flow path between the first valve and the inlet of the separator, so as to clean the separator after the first valve and the third valve are closed, and the first outlet of the separator outputs the cleaning liquid after cleaning the separator.

[0019] In some embodiments,

[0020] The combustible gas flow path includes a combustible gas delivery pipeline connected to the second outlet of the separator. The combustible gas delivery pipeline delivers the combustible gas from the tunnel boring machine to the release device on the ground.

[0021] The valves include a third valve located in the combustible gas delivery pipeline and at one end of the combustible gas delivery pipeline near the second outlet of the separator, and a fourth valve located in the combustible gas delivery pipeline and at one end of the tunnel near the tunnel boring machine.

[0022] The cleaning pipeline includes a second cleaning pipeline, which is connected to the combustible gas delivery pipeline between the third and fourth valves, to clean the combustible gas delivery pipeline between the third and fourth valves after the third and fourth valves are closed.

[0023] In some embodiments, the system further includes a first discharge line connected to a combustible gas delivery line to output cleaning liquid for cleaning the combustible gas delivery line. A first discharge valve is provided in the first discharge line. The first discharge line is connected to the combustible gas delivery line between a third valve and a fourth valve. One of the first discharge line and the second cleaning line is close to the third valve, and the other is close to the fourth valve.

[0024] In some embodiments

[0025] The valves include a fifth valve located in the combustible gas delivery pipeline at the end of the tunnel closer to the tunnel boring machine and a sixth valve located in the combustible gas delivery pipeline at the end of the tunnel furthest from the tunnel boring machine.

[0026] The cleaning pipeline includes a third cleaning pipeline, which is connected to the combustible gas delivery pipeline between the fifth and sixth valves, to clean the combustible gas delivery pipeline between the fifth and sixth valves after the fifth and sixth valves are closed.

[0027] In some embodiments, the combustible gas venting system further includes a second venting line connected to the combustible gas delivery line to output cleaning liquid for cleaning the combustible gas delivery line. The second venting line is provided with a second venting valve. The second venting line is connected to the combustible gas delivery line between a fifth valve and a sixth valve. One of the second venting line and the third cleaning line is close to the fifth valve, and the other is close to the sixth valve.

[0028] In some embodiments,

[0029] The valve also includes a seventh valve located in the middle of the combustible gas delivery pipeline and at the end of the tunnel furthest from the tunnel boring machine. The seventh valve is located upstream of the sixth valve in the direction of combustible gas flow.

[0030] The cleaning pipeline includes a fourth cleaning pipeline, which is connected to the combustible gas delivery pipeline between the seventh valve and the sixth valve. The combustible gas delivery pipeline between the seventh valve and the sixth valve is also connected to a second discharge pipeline.

[0031] In some embodiments,

[0032] The fifth valve is located upstream of the fourth valve in the direction of combustible gas flow, and the cleaning line includes a third cleaning line that connects to the combustible gas delivery line between the fourth and fifth valves;

[0033] A first discharge pipeline is also installed on the combustible gas delivery pipeline between the fifth valve and the fourth valve, and a first discharge valve is installed in the first discharge pipeline.

[0034] In some embodiments, a hose reel is provided at one end of the tunnel near the tunnel of the tunnel boring machine. The combustible gas delivery pipeline includes a hose wound around the hose reel and extending from the tunnel to the release device, and a connecting pipeline connecting the hose and the second outlet of the separator. A third valve is provided in the connecting pipeline. The valve also includes an eighth valve provided in the connecting pipeline and located downstream of the third valve in the direction of combustible gas flow. A second cleaning pipeline is connected to the connecting pipeline between the third valve and the eighth valve.

[0035] In some embodiments, the combustible gas venting system further includes a third venting line, which is connected to the connecting line between the third valve and the eighth valve, and the third venting line is provided with a third venting valve.

[0036] In some embodiments, the releaser further includes:

[0037] The mud outlet is used to discharge the mud carried in the combustible gas. The mud outlet is located at the bottom of the container.

[0038] The water outlet is used to discharge water carried in the combustible gas, and the water outlet is higher than the mud outlet.

[0039] According to another aspect of the present invention, a tunnel boring machine is also provided, which includes the above-described combustible gas venting system.

[0040] By applying the technical solution of this application, the combustible gas in the excavation chamber can be separated into mud and / or water in the separator 6. The separated combustible gas is diluted in the releaser and discharged from the first outlet of the releaser. During the shield tunneling process, and when the excavation chamber is pressurized, the combustible gas is discharged to the ground. At the same time, the pressure of the excavation chamber can be reduced, which improves the problem of combustible gas in the excavation chamber affecting the operators and construction safety in the prior art.

[0041] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A schematic diagram of the structure of a combustible gas venting system according to an embodiment of the present invention is shown.

[0044] In the diagram: 1. First valve; 2. First cleaning valve; 3. Pipeline valve; 4. First compressed gas valve; 5. Second valve; 6. Separator; 7. Third valve; 8. Second cleaning valve; 9. Second compressed gas valve; 10. Mud valve; 11. Eighth valve; 12. Hose reel; 13. Third drain valve; 14. First drain valve; 15. Fifth valve; 16. Fourth valve; 17. Third cleaning valve; 18. Third compressed gas valve; 19. Second drain valve; 20. Seventh valve; 21. Sixth valve; 22. Fourth cleaning valve; 23. Fourth compressed gas valve; 24. Ninth valve; 25; 26. Drain valve; 27. Automatic flushing valve; 28. Bolted flange; 29. ​​Release device. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] like Figure 1 The combustible gas venting system of this embodiment includes a separator 6 and a release device 29.

[0047] The separator 6 includes an inlet connected to the excavation chamber of the tunnel boring machine to introduce combustible gas (e.g., methane), a first outlet for discharging mud and / or water separated from the combustible gas, and a second outlet for discharging the separated combustible gas.

[0048] The release device 29 includes a container, a first inlet disposed on the container and connected to the second outlet of the separator 6 for introducing combustible gas, a second inlet disposed on the container for introducing a medium for diluting the combustible gas, and a first outlet disposed on the upper part of the container for discharging the diluted combustible gas.

[0049] In this embodiment, the combustible gas in the excavation chamber can be separated into mud and / or water in the separator 6. The separated combustible gas is diluted in the releaser 29 and discharged from the first outlet of the releaser 29. During the tunnel boring process, and when the excavation chamber is pressurized, the combustible gas is discharged to the ground. At the same time, the pressure in the excavation chamber can be reduced, which improves the problem of combustible gas in the excavation chamber affecting the operators and construction safety in the prior art.

[0050] The combustible gas discharged from the first outlet of the release device 29 can be released into the air or ignited.

[0051] In some embodiments, the first inlet of the release device 29 is connected to an automatic flushing valve 27. When the automatic flushing valve 27 is opened, cleaning water can be delivered into the release device 29.

[0052] The combustible gas venting system includes a combustible gas flow path, valves, and a cleaning pipeline. The combustible gas flow path extends from the excavation chamber to the release device 29, and includes a separator 6 and a release device 29 arranged sequentially along the combustible gas flow direction. Valves are located in the combustible gas flow path to divide it into at least two unconnected segments when closed. The cleaning pipeline is connected to the combustible gas flow path to deliver a cleaning medium to one segment of the divided combustible gas flow path.

[0053] In this embodiment, the combustible gas flow path can be cleaned in segments, which is beneficial for local cleaning based on the specific conditions of each segment of the combustible gas flow path. Compared to cleaning the entire combustible gas flow path, this helps to ensure cleaning quality and reduce waste of cleaning media.

[0054] In some embodiments, the cleaning pipeline includes a cleaning liquid pipeline and a compressed gas pipeline. The cleaning liquid pipeline is connected to a combustible gas flow path to deliver cleaning liquid into the combustible gas flow path. A compressed gas pipeline is provided in a one-to-one correspondence with the cleaning liquid pipeline, and both the compressed gas pipeline and the corresponding cleaning liquid pipeline are connected to the same section of the combustible gas flow path to provide compressed gas for cleaning the combustible gas flow path together with the cleaning liquid, or to provide compressed gas for purging the cleaning liquid from the combustible gas flow path.

[0055] Compressed gas can be used to clean combustible gas flow paths, and can also be used to remove residual cleaning liquid after the combustible gas flow paths have been cleaned.

[0056] In some embodiments, the valve includes a first valve 1 and a second valve 5 arranged sequentially between the inlet of the excavation chamber and the separator 6 along the combustible gas flow direction, with the first valve 1 located upstream of the second valve 5 in the combustible gas flow direction.

[0057] The cleaning pipeline includes a first cleaning pipeline, which is connected to the combustible gas flow path between the first valve 1 and the second valve 5, to clean the first valve 1 and / or the pipeline between the first valve 1 and the excavation chamber after the second valve 5 is closed.

[0058] The first cleaning pipeline includes a first cleaning liquid pipeline and a first compressed gas pipeline, wherein a first cleaning valve 2 is provided in the first cleaning liquid pipeline and a first compressed gas valve 4 is provided in the first compressed gas pipeline. In some embodiments, a line valve 3 is further provided in the first cleaning liquid pipeline, and the line valve 3 is located upstream of the first cleaning valve 2.

[0059] The tunnel boring machine includes a cutterhead 30 and a partition plate located behind the cutterhead 30. The front of the partition plate is the excavation chamber. The first valve 1 is used to control the opening and closing of the excavation chamber and the combustible gas flow path behind it.

[0060] When cleaning is required for the first valve 1 and / or the pipeline between the first valve 1 and the excavation chamber, close the second valve 5, open the first valve 1, and then open the first cleaning valve 2 and the first compressed gas valve 4 to use high-pressure cleaning liquid (e.g., water) and high-pressure gas to clean the first valve 1 and / or the pipeline between the first valve 1 and the excavation chamber. The cleaning liquid and gas are discharged into the excavation chamber. After cleaning is complete, close all valves.

[0061] In some embodiments, the valves include a first valve 1 located upstream of the inlet of the separator 6 along the flow direction of the combustible gas and a third valve 7 located downstream of the second outlet of the separator 6 along the flow direction of the combustible gas.

[0062] The cleaning pipeline includes a first cleaning pipeline, which is connected to the combustible gas flow path between the first valve 1 and the inlet of the separator 6, so as to clean the separator 6 after the first valve 1 and the third valve 7 are closed, and the first outlet of the separator 6 outputs the cleaning liquid after cleaning the separator 6.

[0063] The combustible gas venting system also includes a mud valve 10 connected to the first outlet of the separator 6.

[0064] When it is necessary to clean the separator 6, close the first valve 1 and the third valve 7, and open the mud and water valve 10; then open the first cleaning valve 2 to clean the separator 6 with high-pressure cleaning liquid (e.g., water), and the cleaning liquid is discharged from the first outlet of the separator 6; then open the first compressed gas valve 4 to deliver water with compressed air.

[0065] In some embodiments, the combustible gas flow path includes a combustible gas delivery pipeline connected to the second outlet of the separator 6, which delivers the combustible gas from the tunnel boring machine A through tunnel B to the release device 29 on the ground surface C.

[0066] The valves include a third valve 7 located in the combustible gas delivery pipeline and at one end of the combustible gas delivery pipeline near the second outlet of the separator 6, and a fourth valve 16 located in the combustible gas delivery pipeline and at one end of the tunnel B near the shield machine A.

[0067] The cleaning pipeline includes a second cleaning pipeline, which is connected to the combustible gas delivery pipeline between the third valve 7 and the fourth valve 16, so as to clean the combustible gas delivery pipeline between the third valve 7 and the fourth valve 16 after the third valve 7 and the fourth valve 16 are closed.

[0068] The second cleaning pipeline includes a second cleaning liquid pipeline and a second compressed gas pipeline, wherein a second cleaning valve 8 is provided in the second cleaning liquid pipeline and a second compressed gas valve 9 is provided in the second compressed gas pipeline.

[0069] In some embodiments, the combustible gas venting system further includes a first discharge pipeline connected to the combustible gas delivery pipeline to output cleaning liquid for cleaning the combustible gas delivery pipeline. A first discharge valve 14 is provided in the first discharge pipeline. The first discharge pipeline is connected to the combustible gas delivery pipeline between a third valve 7 and a fourth valve 16. One of the first discharge pipeline and the second cleaning pipeline is close to the third valve 7, and the other is close to the fourth valve 16.

[0070] The shield machine A is provided with a hose reel 12 near the tunnel B. The combustible gas delivery pipeline includes a hose wound around the hose reel 12 and extending from the tunnel B to the release device 29, and a connecting pipeline connecting the hose and the second outlet of the separator 6.

[0071] The valves include a fifth valve 15 located in the combustible gas delivery pipeline at the end of tunnel B near the shield machine A, and a sixth valve 21 located in the combustible gas delivery pipeline at the end of tunnel B away from the shield machine A.

[0072] The cleaning pipeline includes a third cleaning pipeline, which is connected to the combustible gas delivery pipeline between the fifth valve 15 and the sixth valve 21, to clean the combustible gas delivery pipeline between the fifth valve 15 and the sixth valve 21 after the fifth valve 15 and the sixth valve 21 are closed.

[0073] The third cleaning pipeline includes a third cleaning liquid pipeline and a third compressed gas pipeline, wherein a third cleaning valve 17 is installed in the third cleaning liquid pipeline and a third compressed gas valve 18 is installed in the third compressed gas pipeline.

[0074] In some embodiments, the combustible gas venting system further includes a second venting line connected to the combustible gas delivery line to output cleaning liquid for cleaning the combustible gas delivery line. The second venting line is provided with a second venting valve 19. The second venting line is connected to the combustible gas delivery line between a fifth valve 15 and a sixth valve 21. One of the second venting line and the third cleaning line is close to the fifth valve 15, and the other is close to the sixth valve 21.

[0075] In some embodiments, the fifth valve 15 is located upstream of the fourth valve 16 in the direction of combustible gas flow, and the cleaning line includes a third cleaning line communicating with the combustible gas delivery line between the fourth valve 16 and the fifth valve 15.

[0076] A first discharge pipeline is also provided on the combustible gas delivery pipeline between the fifth valve 15 and the fourth valve 16, and a first discharge valve 14 is provided in the first discharge pipeline.

[0077] In some embodiments, the valve further includes a seventh valve 20 disposed in the combustible gas delivery pipeline and located at the end of the tunnel B away from the tunnel boring machine A, the seventh valve 20 being located upstream of the sixth valve 21 in the direction of combustible gas flow.

[0078] The cleaning pipeline includes a fourth cleaning pipeline. The fourth cleaning pipeline is connected to the combustible gas delivery pipeline between the seventh valve 20 and the sixth valve 21. The combustible gas delivery pipeline between the seventh valve 20 and the sixth valve 21 is also connected to a second discharge pipeline, which is equipped with a second discharge valve 19.

[0079] The fourth cleaning pipeline includes a fourth cleaning liquid pipeline and a fourth compressed gas pipeline, wherein a fourth cleaning valve 22 is installed in the fourth cleaning liquid pipeline and a fourth compressed gas valve 23 is installed in the fourth compressed gas pipeline.

[0080] When cleaning the gas delivery pipeline inside the tunnel, first, close valves 15, 21, and 14; open valves 16, 20, and 19; open valve 17 until water flows out of valve 19; then close valve 17; open compressed gas valve 18 until water flows out of the combustible gas pipeline. Finally, close valve 18 and 19.

[0081] In some embodiments, a hose reel 12 is provided at one end of the tunnel A near the tunnel B. The combustible gas delivery pipeline includes a hose wound around the hose reel 12 and extending from the tunnel B to the release device 29, and a connecting pipeline connecting the hose and the second outlet of the separator 6. A third valve 7 is provided in the connecting pipeline. The valve also includes an eighth valve 11 provided in the connecting pipeline and located downstream of the third valve 7 in the direction of combustible gas flow. A second cleaning pipeline is connected to the connecting pipeline between the third valve 7 and the eighth valve 11.

[0082] In some embodiments, the combustible gas venting system further includes a third venting pipeline, which is connected to the connecting pipeline between the third valve 7 and the eighth valve 11, and the third venting pipeline is provided with a third venting valve 13.

[0083] When cleaning the connecting pipes and hoses on the hose reel 12 of the tunnel boring machine section, first close the third valve 7; close the third discharge valve and the fourth valve 16; then open the first discharge valve 14 to discharge the cleaning fluid; open the eighth valve 11 and the fifth valve 15; then open the second cleaning valve 8 until the cleaning fluid is discharged from the first discharge valve 14; then close the second cleaning valve 8; then open the second compressed gas valve 9 until the cleaning fluid flows out from the combustible gas delivery pipeline, and finally close the second cleaning valve 8 and the first discharge valve 14.

[0084] In some embodiments, the release device further includes a mud outlet and a water outlet. The first inlet of the release device is also connected to a ninth valve 24.

[0085] The mud outlet is used to discharge the mud carried in the combustible gas. The mud outlet is located at the bottom of the container. A mud valve 25 is connected to the mud outlet.

[0086] A water outlet, used to discharge water carried in the combustible gas, is located above the mud outlet. A drain valve 26 is connected to the water outlet. A bolted flange 28 is also installed at the bottom of the release device 29.

[0087] According to another aspect of the present invention, a tunnel boring machine is also provided, which includes the above-described combustible gas venting system.

[0088] The above are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combustible gas venting system, characterized in that, include: The separator (6) includes an inlet connected to the excavation chamber of the tunnel boring machine for introducing combustible gas, a first outlet for discharging mud and / or water separated from the combustible gas, and a second outlet for discharging the separated combustible gas. The release device (29) includes a container, a first inlet disposed on the container and connected to the second outlet of the separator (6) for introduction, a second inlet disposed on the container for introducing a medium for diluting the combustible gas, and a first outlet disposed on the upper part of the container for discharging the diluted combustible gas. A combustible gas flow path extends from the excavation chamber to the release device (29), and the combustible gas flow path includes the separator (6) and the release device (29) arranged sequentially along the combustible gas flow direction. A valve is provided in the combustible gas flow path to divide the combustible gas flow path into at least two non-communicating combustible gas flow paths when closed. A cleaning pipeline is connected to the combustible gas flow path to deliver a cleaning medium to one segment of the segmented combustible gas flow path.

2. The combustible gas venting system according to claim 1, characterized in that, The cleaning pipeline includes: A cleaning liquid pipeline is connected to the combustible gas flow path to deliver cleaning liquid into the combustible gas flow path; Compressed gas pipelines are provided in a one-to-one correspondence with the cleaning liquid pipelines. The compressed gas pipelines and the corresponding cleaning liquid pipelines are connected to the same section of the combustible gas flow path to provide compressed gas to clean the combustible gas flow path together with the cleaning liquid, or to provide compressed gas to remove the cleaning liquid from the combustible gas pipeline.

3. The combustible gas venting system according to claim 1 or 2, characterized in that, The valve includes a first valve (1) and a second valve (5) arranged sequentially between the inlet of the excavation chamber and the separator (6) along the direction of combustible gas flow, with the first valve (1) located upstream of the second valve (5) in the direction of combustible gas flow. The cleaning pipeline includes a first cleaning pipeline, which is connected to the combustible gas flow path between the first valve (1) and the second valve (5) to clean the first valve (1) and / or the pipeline between the first valve (1) and the excavation chamber after the second valve (5) is closed.

4. The combustible gas venting system according to claim 1 or 2, characterized in that, The valve includes a first valve (1) located upstream of the inlet of the separator (6) along the flow direction of the combustible gas and a third valve (7) located downstream of the second outlet of the separator (6) along the flow direction of the combustible gas. The cleaning pipeline includes a first cleaning pipeline, which is connected to the combustible gas flow path between the first valve (1) and the inlet of the separator (6) to clean the separator (6) after the first valve (1) and the third valve (7) are closed, and the first outlet of the separator (6) outputs the cleaning liquid after cleaning the separator (6).

5. The combustible gas venting system according to claim 1 or 2, characterized in that, The combustible gas flow path includes a combustible gas delivery pipeline connected to the second outlet of the separator (6), and the combustible gas delivery pipeline is used to deliver the combustible gas from the shield machine (A) through the tunnel (B) to the release device (29) on the ground (C); The valves include a third valve (7) located in the combustible gas delivery pipeline and at one end of the combustible gas delivery pipeline near the second outlet of the separator (6), and a fourth valve (16) located in the combustible gas delivery pipeline and at one end of the tunnel (B) near the shield machine (A). The cleaning pipeline includes a second cleaning pipeline, which is connected to the combustible gas delivery pipeline between the third valve (7) and the fourth valve (16) to clean the combustible gas delivery pipeline between the third valve (7) and the fourth valve (16) after the third valve (7) and the fourth valve (16) are closed.

6. The combustible gas venting system according to claim 5, characterized in that, It also includes a first discharge pipeline connected to the combustible gas delivery pipeline to output cleaning liquid for cleaning the combustible gas delivery pipeline. The first discharge pipeline is provided with a first discharge valve (14). The first discharge pipeline is connected to the combustible gas delivery pipeline between the third valve (7) and the fourth valve (16). One of the first discharge pipeline and the second cleaning pipeline is close to the third valve (7), and the other is close to the fourth valve (16).

7. The combustible gas venting system according to claim 5, characterized in that, Also includes: The valves include a fifth valve (15) located in the combustible gas delivery pipeline and at one end of the tunnel (B) near the shield machine (A), and a sixth valve (21) located in the combustible gas delivery pipeline and at one end of the tunnel (B) away from the shield machine (A). The cleaning pipeline includes a third cleaning pipeline, which is connected to the combustible gas delivery pipeline between the fifth valve (15) and the sixth valve (21) to clean the combustible gas delivery pipeline between the fifth valve (15) and the sixth valve (21) after the fifth valve (15) and the sixth valve (21) are closed.

8. The combustible gas venting system according to claim 7, characterized in that, It also includes a second discharge pipeline connected to the combustible gas delivery pipeline to output cleaning liquid for cleaning the combustible gas delivery pipeline. The second discharge pipeline is provided with a second discharge valve (19). The second discharge pipeline is connected to the combustible gas delivery pipeline between the fifth valve (15) and the sixth valve (21). One of the second discharge pipeline and the third cleaning pipeline is close to the fifth valve (15), and the other is close to the sixth valve (21).

9. The combustible gas venting system according to claim 7, characterized in that, The valve also includes a seventh valve (20) located in the combustible gas delivery pipeline at the end of the tunnel (B) away from the tunnel boring machine (A), the seventh valve (20) being located upstream of the sixth valve (21) in the direction of combustible gas flow. The cleaning pipeline includes a fourth cleaning pipeline, which is connected to the combustible gas delivery pipeline between the seventh valve (20) and the sixth valve (21). A second discharge pipeline is also connected to the combustible gas delivery pipeline between the seventh valve (20) and the sixth valve (21).

10. The combustible gas venting system according to claim 7, characterized in that, The fifth valve (15) is located upstream of the fourth valve (16) in the direction of the flow of the combustible gas, and the cleaning pipeline includes a third cleaning pipeline connected to the combustible gas delivery pipeline between the fourth valve (16) and the fifth valve (15); A first discharge pipeline is also provided on the combustible gas delivery pipeline between the fifth valve (15) and the fourth valve (16), and a first discharge valve (14) is provided in the first discharge pipeline.

11. The combustible gas venting system according to claim 5, characterized in that, The shield machine (A) is provided with a hose reel (12) near the tunnel (B). The combustible gas delivery pipeline includes a hose wound around the hose reel (12) and extending from the tunnel (B) to the release device (29) and a connecting pipeline connecting the hose and the second outlet of the separator (6). The third valve (7) is provided in the connecting pipeline. The valve also includes an eighth valve (11) provided in the connecting pipeline and located downstream of the third valve (7) in the direction of combustible gas flow. The second cleaning pipeline is connected to the connecting pipeline between the third valve (7) and the eighth valve (11).

12. The combustible gas venting system according to claim 11, characterized in that, It also includes a third discharge pipeline, which is connected to the connecting pipeline between the third valve (7) and the eighth valve (11), and the third discharge pipeline is provided with a third discharge valve (13).

13. The combustible gas venting system according to claim 1, characterized in that, The release device also includes: A mud outlet is provided at the bottom of the container to discharge mud carried in the combustible gas. A water outlet is provided for discharging water carried in the combustible gas, and the water outlet is located above the mud outlet.

14. A tunnel boring machine, characterized in that, The combustible gas venting system includes any one of claims 1 to 13.

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