Exhaust ventilation system for tunneling working face and method of using the same

Abstract

The present invention provides an exhaust ventilation system for a tunneling working face and its use method, relating to the field of coal mine ventilation and dust control. The ventilation system comprises a mining area air intake tunnel, a return air bypass, a mining area return air tunnel, and an exhaust fan unit. The tunneling working face is connected to the mining area air intake tunnel and is also connected to the mining area return air tunnel via the return air bypass. The exhaust fan unit has an air intake section assembly connected to the air intake section assembly, which includes an air intake duct for extracting harmful gases and dust from the tunneling working face. The exhaust fan unit has a return air section assembly connected to the air outlet section assembly, which includes a return air duct. The return air duct passes through the return air bypass and extends into the mining area return air tunnel. When the ventilation system is in use, the air intake end of the air intake duct can be placed in the head-facing area. The exhaust fan unit can discharge polluted gases from the head-facing area to the mining area return air tunnel via the return air bypass, thereby achieving independent ventilation for the tunneling working face, achieving good ventilation effects, and effectively preventing the adverse effects of polluted gases on other working faces.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine ventilation and dust prevention, and in particular to an exhaust ventilation system for an excavation working face and a method of using the system. Background Art

[0002] According to Article 163 of the Coal Mine Safety Regulations (2016 Edition), tunneling tunnels must be ventilated using full-pressure mine ventilation or local ventilators. Full-pressure ventilation of the tunneling working face requires the erection of longitudinal wind barriers in the tunneling working face to divide the tunnel into an air intake side and a return air side. However, tunneling tunnels have limited space, and erecting longitudinal wind barriers is difficult. Furthermore, air leaks are easily caused by the upper part of the wind barrier and the tunnel roof, as well as the lower part of the wind barrier and the tunnel floor. This makes it difficult to ensure effective air volume in the headwater area of the tunneling working face, so full-pressure ventilation is rarely used.

[0003] There are three types of local fan ventilation: forced-in, exhausted, and mixed. The mixed type combines the advantages and disadvantages of forced-in and exhausted ventilation. This ventilation method requires both forced-in local fans and exhausted local fans to be deployed simultaneously on the excavation working face, and requires interlocking and interlocking. This makes deployment and management difficult, and is therefore rarely used on-site in coal mines. Forced-in ventilation is the safest and most widely used ventilation method for excavation tunnels. Currently, forced-in ventilation with local fans is the most common method for excavation working faces in my country. However, forced-in ventilation exposes both equipment and workers to polluted air, and dust pollution in the working face, in particular, has a serious impact on the workers' working environment and health. Existing exhaust ventilation uses ducts and local fans to extract polluted air and discharge it into the mining area's air intake tunnel, improving the working environment. However, the ventilation effect is still relatively poor, and the polluted gas can also pollute other working faces. Summary of the Invention

[0004] The first purpose of the present invention is to provide an exhaust ventilation system for a tunneling working face to solve the technical problems in the prior art of poor ventilation effect of the exhaust ventilation system for a tunneling working face and contamination of other working faces by dirty gases.

[0005] The exhaust ventilation system for the excavation working face provided by the present invention comprises an air inlet tunnel in the mining area, a return air bypass, a return air tunnel in the mining area and an exhaust fan unit. The excavation working face is connected to the air inlet tunnel in the mining area and is connected to the return air tunnel in the mining area through the return air bypass.

[0006] The air inlet end of the exhaust fan group is connected to an air inlet section assembly, and the air inlet section assembly includes an air inlet pipe, and the air inlet pipe is used to extract harmful gases and dust from the excavation working face; the air outlet end of the exhaust fan group is connected to a return air section assembly, and the return air section assembly includes a return air duct, and the return air duct passes through the return air bypass and extends into the return air lane of the mining area.

[0007] Furthermore, ventilation holes are provided on the wall of the return air bypass for introducing fresh air flow into the return air lane of the mining area; the exhaust fan unit is arranged at the inlet of the return air bypass in the excavation working face.

[0008] Furthermore, the air inlet pipe is an extraction pipe, and / or the air return pipe is an extraction pipe.

[0009] Furthermore, there are multiple air inlet pipes, and a tee is connected between the air inlet pipe and the air inlet of the exhaust fan unit and between two adjacent air inlet pipes. Among the three openings of the tee, two openings are used for circulating gas, and the third opening is provided with a shut-off valve.

[0010] Furthermore, the mining area return air lane is provided with a mining area extraction pipeline, the mining area extraction pipeline is provided with an extraction stop valve, and the mining area extraction pipeline is used to extract gas;

[0011] The return air duct is provided with a gas detection hole, the gas detection hole is provided close to the exhaust fan unit, and the gas detection hole is provided with a detection stop valve;

[0012] From the air inlet of the exhaust fan group to the air inlet end of the air inlet section assembly, the multiple tees are respectively the first tee, the second tee, ..., the N+1 tee, and the multiple air inlet pipes are respectively the first air inlet pipe, the second air inlet pipe, ..., the Nth air inlet pipe. A flow valve is arranged between the first tee and the first air inlet pipe, and the flow valve is used to control the discharge amount of high-concentration gas in the head area of the excavation working face when discharging gas.

[0013] Furthermore, the air inlet pipe is provided with a dust removal device, and the dust removal device is used to remove dust in the gas flowing through the air inlet pipe.

[0014] Furthermore, the air inlet section assembly also includes a grounding device, which is installed on the air inlet pipe and is used to eliminate static electricity on the air inlet pipe.

[0015] Furthermore, the air inlet section assembly also includes a telescopic skeleton air duct, one end of the telescopic skeleton air duct is connected to the air inlet end of the air inlet pipe through a tee, and the other end can extend into the head area of the excavation working face.

[0016] Furthermore, the mining area air intake tunnel is provided with a mining area compressed air pipeline and a mining area water supply pipeline, and the excavation working face is provided with an excavation working face compressed air pipeline and an excavation working face water supply pipeline, the excavation working face compressed air pipeline is connected to the mining area compressed air pipeline, and the excavation working face water supply pipeline is connected to the mining area water supply pipeline;

[0017] The air inlet section assembly also includes a dust isolation device, which is provided with a nozzle. The compressed air pipeline of the excavation working face is connected to the water supply pipeline of the excavation working face and then connected to the nozzle. The nozzle can form a dust isolation curtain between the main body of the tunnel boring machine and the cutting head; the air inlet end of the air inlet section assembly passes through the dust isolation curtain and extends into the head area where the cutting head is located.

[0018] Furthermore, the return air bypass is provided with two air doors, at least one of which is in a closed state, for isolating the main air flow between the excavation working face and the return air channel of the mining area as well as the passing pedestrians.

[0019] The exhaust ventilation system for the excavation working face provided by the present invention can produce the following beneficial effects:

[0020] The exhaust ventilation system for the excavation working face provided by the present invention can, when in use, place the air inlet end of the air inlet pipe in the head area of the excavation working face, and then use the exhaust fan unit to discharge the dirty gas mixed with dust, gas, etc. in the head area to the return air lane of the mining area through the return air bypass, so that the workers and equipment in the excavation working face are in fresh air flow, the ventilation effect is good, and the dirty air flow in the excavation working face is discharged into the return air lane of the mining area, forming independent ventilation of the excavation working face, effectively avoiding the situation where the dirty gas is connected in series to other return working faces or excavation working faces, and can avoid adverse effects on other working faces.

[0021] The second purpose of the present invention is to provide a method for using an exhaust ventilation system for an excavation working face, so as to solve the technical problems existing in the prior art of poor ventilation effect, poor gas discharge effect, and gas pollution of other working faces of the exhaust ventilation system for an excavation working face.

[0022] The method for using the exhaust ventilation system for a tunneling working face provided by the present invention uses the exhaust ventilation system for a tunneling working face to discharge gas, comprising the following steps: S210 checks the gas concentration of the exhaust fan unit and its switch, and if both do not exceed 0.5%, opens the first stop valve on the first three-way valve;

[0023] S220 starts the exhaust fan unit and simultaneously opens the detection stop valve. The gas concentration of the mixed gas of the gas extracted from the head area of the excavation working face and the gas entering from the first stop valve is detected through the gas detection hole. The flow rate of the gas extracted from the head area is controlled by the flow valve to ensure that the gas concentration of the mixed gas in the return air duct does not exceed 1.5%;

[0024] S230: As high-concentration gas is discharged from the excavation working face, the flow rate of gas extracted from the head area is gradually increased through the flow valve, and the first stop valve is gradually closed to reduce the flow rate of gas entering from the first stop valve;

[0025] S240: When the flow valve is opened to the maximum and the first stop valve is completely closed, the gas in the extraction pipe of the return air section assembly gradually decreases from the highest concentration of 1.5% to below 1% or the normal gas concentration of the excavation working face. After maintaining this concentration for a certain period of time, the gas concentration in the entire tunnel is checked. If the gas concentration does not exceed 1%, the gas discharge at the excavation working face is completed.

[0026] S250 completely closes the first stop valve and closes the detection stop valve.

[0027] The method for discharging gas from an excavation working face provided by the present invention uses the exhaust ventilation system for the excavation working face, which has a good gas discharge effect and can effectively avoid gas pollution to other working faces.

[0028] The third purpose of the present invention is to provide a method for using an exhaust ventilation system for an excavation working face, so as to solve the technical problems existing in the prior art of poor ventilation effect, poor gas discharge effect, and gas pollution of other working faces of the exhaust ventilation system for an excavation working face.

[0029] The method for using the exhaust ventilation system for a tunneling working face provided by the present invention comprises the following steps:

[0030] S310: Remove the exhaust fan unit of the exhaust ventilation system and connect the exhaust pipes on both sides of the exhaust fan unit with the exhaust pipe; connect the exhaust pipe outlet of the return air section to the exhaust pipeline in the mining area through the exhaust stop valve;

[0031] S320 connects the fracture zone boreholes, goaf extraction pipes or other extraction boreholes in the excavation working face to the pipe mouth of the extraction pipe of the excavation working face or the nearest tee, and opens the extraction stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0033] Figure 1 This is a schematic structural diagram of the exhaust ventilation system for the excavation working face provided by the present invention.

[0034] Description of reference numerals:

[0035] 100- air inlet tunnel in the mining area; 110- compressed air pipeline in the mining area; 120- water supply pipeline in the mining area;

[0036] 200 - Excavation working face; 210 - Excavation working face compressed air pipeline; 220 - Excavation working face water supply pipeline; 230 - Excavator; 231 - Main body; 232 - Cutting arm; 233 - Cutting head;

[0037] 300-return air bypass; 310-air door;

[0038] 400-return air lane in mining area; 410-extraction pipeline in mining area; 411-extraction stop valve;

[0039] 500-extractable fan unit;

[0040] 610-air inlet pipe; 611-tee; 612-stop valve; 613-flow valve; 620-dust removal device; 630-telescopic frame air duct; 631-connector quick locking device; 640-dust isolation device; 641-dust isolation curtain; 650-grounding device;

[0041] 710-return air duct; 711-gas detection hole; 712-detection stop valve. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] This embodiment provides an exhaust ventilation system for a tunneling working face, such as Figure 1 As shown, the exhaust ventilation system of the excavation working face includes a mining area air inlet tunnel 100, a return air bypass 300, a mining area return air tunnel 400 and an exhaust fan unit 500. The excavation working face 200 is connected to the mining area air inlet tunnel 100, and is connected to the mining area return air tunnel 400 through the return air bypass 300; the air inlet end of the exhaust fan unit 500 is connected to an air inlet section assembly, and the air inlet section assembly includes an air inlet pipe 610, and the air inlet pipe 610 is used to extract harmful gases and dust from the excavation working face 200; the air outlet end of the exhaust fan unit 500 is connected to a return air section assembly, and the return air section assembly includes a return air pipe 710, and the return air pipe 710 passes through the return air bypass 300 and extends into the mining area return air tunnel 400.

[0044] The exhaust ventilation system for the excavation working face provided in this embodiment can, when in use, place the air inlet end of the air inlet pipe 610 in the head area of the excavation working face 200, and then use the exhaust fan unit 500 to discharge the dirty gas mixed with dust, gas, etc. in the head area to the return air lane 400 of the mining area through the return air bypass 300, so that the workers and equipment in the excavation working face 200 are in fresh air flow, with good ventilation effect, and the dirty air flow in the excavation working face 200 is discharged into the return air lane 400 of the mining area, forming independent ventilation of the excavation working face 200, effectively avoiding the situation where the dirty gas is connected in series to other return working faces or excavation working faces, and can avoid adverse effects on other working faces.

[0045] Specifically, in this embodiment, ventilation holes are provided in the wall of the return air bypass 300 for introducing fresh air into the mining area return airway 400. The exhaust fan unit 500 is located at the entrance of the return air bypass 300 within the excavation working face 200. Because the ventilation holes are provided in the wall of the return air bypass 300, fresh air from the mining area air intake tunnel 100 enters the mining area return airway 400 through the ventilation holes. Therefore, the exhaust fan unit 500 and its electrical equipment are located at the entrance of the return air bypass 300, ensuring that they are always exposed to fresh air, thereby preventing dangerous situations caused by the interaction of electric sparks with harmful gases and dust.

[0046] Specifically, in this embodiment, both the air inlet pipe 610 and the air return pipe 710 are extraction pipes. This arrangement allows the extraction pipes, which are otherwise unused during tunneling, to be utilized. This not only eliminates the need for wind ducts, reduces the number of equipment in the tunnel and the space occupied by wind ducts, but also improves the utilization rate of the extraction pipes. Furthermore, the extraction pipes are typically steel pipes, which are less susceptible to damage and air leakage, thus ensuring the ventilation system's tightness, thereby ensuring ventilation efficiency and reducing the degree of environmental pollution at the tunneling face.

[0047] It should be noted that in other embodiments of the present application, only one of the air inlet pipe 610 and the air return pipe 710 may be an extraction pipe, for example, only the air inlet pipe 610 is an extraction pipe, and the air return pipe 710 is an air duct.

[0048] Specifically, in this embodiment, Figure 1 As shown, there are multiple air inlet pipes 610. A tee 611 connects each air inlet pipe 610 to the air inlet of the exhaust fan unit 500, as well as between two adjacent air inlet pipes 610. Of the three openings in the tee 611, two are used for air circulation, and the third opening is equipped with a shutoff valve 612. The shutoff valve 612 is normally closed. This arrangement allows for convenient extension of the ventilation duct as excavation progresses.

[0049] Specifically, in this embodiment, continue as Figure 1As shown, the air intake section assembly further includes a telescopic frame air duct 630. One end of the telescopic frame air duct 630 is connected to the air intake end of the air intake pipe 610 via a tee 611, and the other end is capable of extending into the headland area of the tunneling working face 200. The telescopic frame air duct 630 is telescopic, thereby facilitating adjustment of its length and facilitating placement of the air intake end of the air intake section assembly, i.e., the air intake end of the telescopic frame air duct 630, within the headland area of the tunneling working face 200.

[0050] Specifically, in this embodiment, the telescopic skeleton air duct 630 can be connected to the cutting arm 232 of the tunnel boring machine 230.

[0051] Specifically, in this embodiment, from the air inlet of the exhaust fan unit 500 to the air inlet end of the air inlet section assembly, the multiple tees 611 are respectively the first tee, the second tee, ..., the N+1 tee, and the multiple air inlet pipes 610 are respectively the first air inlet pipe, the second air inlet pipe, ..., the Nth air inlet pipe.

[0052] Specifically, in this embodiment, the air inlet section assembly further includes a quick-locking joint device 631, which is used to quickly lock the telescopic frame air duct 630 to the N+1 tee. This arrangement allows the quick-locking joint device 631 to quickly and securely connect the telescopic frame air duct 630 to the N+1 tee, thereby effectively preventing the telescopic frame air duct 630 from detaching from the N+1 tee.

[0053] In this embodiment, as the excavation work progresses, when the ventilation distance needs to be extended, the ventilation pipeline can be extended according to the following steps:

[0054] S110 opens the N+1 stop valve on the N+1 tee;

[0055] S120 Open the joint quick locking device 631, remove the telescopic frame air duct 630 from the air inlet of the N+1 tee, and connect it to the N+1 stop valve to maintain the effective air volume in the front area of the excavation working face 200 when extending the ventilation pipeline;

[0056] S130: Install the N+1 extraction pipe to the air inlet of the N+1 tee;

[0057] S140: Remove the telescopic frame air duct 630 from the N+1 stop valve, install it to the air inlet end of the N+1 extraction pipe, and lock it with the joint quick locking device 631;

[0058] S150 closes the N+1 stop valve, completing the extension of the ventilation pipeline.

[0059] Specifically, in this embodiment, continue as Figure 1As shown, the mining area return air lane 400 is provided with a mining area extraction pipeline 410, and the mining area extraction pipeline 410 is provided with an extraction stop valve 411, and the mining area extraction pipeline 410 is used to extract gas; the return air pipe 710 is provided with a gas detection hole 711, and the gas detection hole 711 is arranged close to the exhaust fan unit 500, and the gas detection hole 711 is provided with a detection stop valve 712; a flow valve 613 is provided between the first three-way valve and the first air inlet pipe, and the flow valve 613 is used to control the discharge amount of high-concentration gas in the head area of the excavation working face 200 when discharging gas.

[0060] Based on the above configuration, this embodiment further provides a method for using an exhaust ventilation system for a tunneling working face, that is, using the exhaust ventilation system to discharge gas, thereby resolving the technical problem that the existing exhaust ventilation system for a tunneling working face is difficult to discharge gas. The method may include the following steps:

[0061] S210 checks the gas concentration of the exhaust fan unit 500 and its switch. If the gas concentration does not exceed 0.5%, opens the first stop valve on the first three-way valve.

[0062] S220: The exhaust fan unit 500 is turned on, and the detection stop valve 712 is opened at the same time. The gas concentration of the mixed gas of the gas extracted from the head area of the excavation working face 200 and the gas entering through the first stop valve is detected through the gas detection hole 711. The flow rate of the gas extracted from the head area is controlled through the flow valve 613 to ensure that the gas concentration of the mixed gas in the return air duct 710 does not exceed 1.5%.

[0063] S230 As high-concentration gas is discharged from the excavation working face 200, the flow rate of gas extracted from the head area is gradually increased through the flow valve 613, while the first stop valve is gradually closed to reduce the flow rate of gas entering through the first stop valve;

[0064] At step S240, when the flow valve 613 is opened to the maximum and the first stop valve is completely closed, the gas in the extraction pipe of the return air section assembly gradually decreases from the highest concentration of 1.5% to below 1% or the normal gas concentration of the excavation working face 200. After maintaining this concentration for a certain period of time, the gas concentration in the entire tunnel is checked. If the gas concentration does not exceed 1%, the gas discharge from the excavation working face 200 is completed.

[0065] S250 completely closes the first stop valve and the detection stop valve 712, and the excavation working face 200 can resume normal ventilation.

[0066] Specifically, in this embodiment, Figure 1As shown, the air inlet pipe 610 is provided with a dust removal device 620, which is used to remove dust from the air flowing through the air inlet pipe 610. The dust removal device 620 reduces the dust content of the air flowing into the exhaust fan unit 500, which can reduce the wear of the components in the exhaust fan unit 500, thereby extending the service life of the exhaust fan unit 500.

[0067] More specifically, in this embodiment, the dust removal device 620 can be a filter.

[0068] Specifically, in this embodiment, continue as Figure 1 As shown, the air inlet section assembly further includes a grounding device 650 , which is installed on the air inlet pipe 610 to eliminate static electricity on the air inlet pipe 610 .

[0069] Specifically, in this embodiment, continue as Figure 1 As shown, the mining area air inlet tunnel 100 is provided with a mining area compressed air pipeline 110 and a mining area water supply pipeline 120, and the excavation working face 200 is provided with an excavation working face compressed air pipeline 210 and a excavation working face water supply pipeline 220. The excavation working face compressed air pipeline 210 is connected with the mining area compressed air pipeline 110, and the excavation working face water supply pipeline 220 is connected with the mining area water supply pipeline 120; the air inlet section assembly also includes a dust isolation device 640, and the dust isolation device 640 is provided with a nozzle. After the excavation working face compressed air pipeline 210 is connected with the excavation working face water supply pipeline 220, it is connected to the nozzle to form a wind and water linkage dust isolation curtain 641 between the main body 231 of the excavator 230 and the cutting head 233; the air inlet end of the air inlet section assembly passes through the dust isolation curtain 641 and extends into the head area where the cutting head 233 is located. The dust screen 641 isolates dust generated during excavation within the headwater area, preventing it from spreading to other areas of the excavation working face 200. This facilitates dust extraction to the return air lane 400 in the mining area, significantly improving the working environment. Furthermore, compared to using only a water curtain spray, the wind-water combined spray system leverages compressed air pressure to increase spray pressure, enhancing spray atomization, saving water, and providing better dust isolation.

[0070] More specifically, the dust isolation device 640 is provided on the cutting arm 232 of the tunnel boring machine 230 .

[0071] It should be noted that in this embodiment, the dust-isolating device 640 forms a wind and water linkage curtain. However, in other embodiments of the present application, the dust-isolating device 640 is not limited to the above-mentioned form of forming a wind and water linkage curtain, but can also form only a water curtain or only a wind curtain.

[0072] It should also be noted that in other embodiments of the present application, the dust isolation device 640 may not be provided, and the dust isolation curtain 641 may be a curtain, etc. That is, as long as it can block dust, the present application does not limit the specific structure of the dust isolation device 640.

[0073] Specifically, in this embodiment, the return air bypass 300 is equipped with two dampers 310, at least one of which is closed, to block the main airflow between the excavation working face 200 and the mining area return airway 400, as well as the passage of pedestrians. Without dampers 310, only a small portion of the airflow from the excavation working face 200 and the mining area return airway 400 would pass through the return air duct 710, with the majority of the airflow passing through the return air bypass 300. Therefore, dampers 310 can block the main airflow between the two. To continue blocking the main airflow between the two, pedestrians must first open the first damper, while the second damper is closed. After closing the first damper, the second damper is opened to allow pedestrians to pass through.

[0074] This embodiment also provides a method for using the exhaust ventilation system of the excavation working face. That is, after the excavation working face 200 is excavated into place and full-pressure ventilation is achieved, the exhaust ventilation system of the excavation working face 200 can be used to extract gas in the following manner:

[0075] S310: Remove the exhaust fan unit 500 of the exhaust ventilation system and connect the extraction pipes on both sides of the exhaust fan unit 500 with extraction pipes; remove the dust removal device 620; connect the outlet of the return air section extraction pipe to the extraction pipeline 410 in the mining area through the extraction stop valve 411; and remove the telescopic frame air duct 630;

[0076] S320 connects the fracture zone boreholes, goaf extraction pipes or other extraction boreholes in the excavation working face 200 to the pipe mouth of the extraction pipe of the excavation working face 200 or the nearest tee 611, opens the extraction stop valve 411, and completes the conversion of the exhaust ventilation system of the excavation working face to the extraction pipeline system.

[0077] In summary, the exhaust ventilation system for the excavation working face provided by this embodiment discharges the dirty gas in the head area into the return air channel 400 of the mining area through the return air bypass 300 through the exhaust fan unit 500, so that the dirty gas will not be connected in series with the mining working face or other excavation working faces, forming independent ventilation of the excavation working face 200; in addition, the dust generated during excavation is sealed by the dust isolation device 640 and then extracted by the exhaust fan unit 500, which solves the dust hazard generated by the cutting of the excavation working face 200 and greatly improves the working environment of the excavation working face 200; in addition, in mines that need to carry out gas extraction, this embodiment can replace the air ducts that are no longer used after the excavation is completed with the extraction pipes needed for mining, which can save manpower and time. At the same time, the extraction pipes used during ventilation are not easily damaged or leaked, which can avoid the phenomenon that traditional air ducts are easily damaged and leaked.

[0078] Finally, it should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0079] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to the embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. An exhaust ventilation system for a tunneling working face, characterized in that: It comprises a mining area air inlet tunnel (100), a return air bypass (300), a mining area return air tunnel (400) and an exhaust fan unit (500); the excavation working face (200) is connected to the mining area air inlet tunnel (100), and is connected to the mining area return air tunnel (400) through the return air bypass (300); The air inlet end of the exhaust fan unit (500) is connected to an air inlet section assembly, the air inlet section assembly includes an air inlet pipe (610), and the air inlet pipe (610) is used to extract harmful gases and dust from the excavation working face (200); the air outlet end of the exhaust fan unit (500) is connected to a return air section assembly, the return air section assembly includes a return air pipe (710), and the return air pipe (710) passes through the return air bypass (300) and then extends into the return air lane (400) of the mining area; The wall of the return air bypass (300) is provided with ventilation holes for introducing fresh air flow into the return air lane (400) of the mining area; the exhaust fan unit (500) is arranged at the inlet of the return air bypass (300).

2. The exhaust ventilation system for the excavation working face according to claim 1, characterized in that: The air inlet pipe (610) is an extraction pipe, and / or the air return pipe (710) is an extraction pipe.

3. The exhaust ventilation system for the excavation working face according to claim 1 or 2, characterized in that: There are multiple air inlet pipes (610), and a tee (611) is connected between each air inlet pipe (610) and the air inlet of the exhaust fan unit (500), as well as between two adjacent air inlet pipes (610). Of the three openings of the tee (611), two openings are used for circulating gas, and the third opening is provided with a stop valve (612).

4. The exhaust ventilation system for the excavation working face according to claim 3, characterized in that: The mining area return air lane (400) is provided with a mining area extraction pipeline (410), the mining area extraction pipeline (410) is provided with an extraction stop valve (411), and the mining area extraction pipeline (410) is used to extract gas; The return air duct (710) is provided with a gas detection hole (711), the gas detection hole (711) is provided close to the exhaust fan unit (500), and the gas detection hole (711) is provided with a detection stop valve (712); From the air inlet of the exhaust fan unit (500) to the air inlet end of the air inlet section assembly, the plurality of tees (611) are respectively the first tees, the second tees, ..., the N+1 tees, and the plurality of air inlet pipes (610) are respectively the first air inlet pipe, the second air inlet pipe, ..., the N th air inlet pipe. A flow valve (613) is provided between the first tees and the first air inlet pipe. The flow valve (613) is used to control the discharge amount of high-concentration gas in the head area of the excavation working face (200) when discharging gas.

5. The exhaust ventilation system for the excavation working face according to claim 3, characterized in that: The air inlet section assembly further comprises a telescopic frame air duct (630), one end of which is connected to the air inlet end of the air inlet pipe (610) via a tee (611), and the other end of which can extend into the head area of the excavation working face (200).

6. The exhaust ventilation system for the excavation working face according to claim 3, characterized in that: The mining area air intake tunnel (100) is provided with a mining area compressed air pipeline (110) and a mining area water supply pipeline (120); the excavation working face (200) is provided with an excavation working face compressed air pipeline (210) and an excavation working face water supply pipeline (220); the excavation working face compressed air pipeline (210) is in communication with the mining area compressed air pipeline (110), and the excavation working face water supply pipeline (220) is in communication with the mining area water supply pipeline (120); The air intake section assembly further includes a dust isolation device (640), the dust isolation device (640) being provided with a nozzle. The excavation working face compressed air pipeline (210) is connected to the excavation working face water supply pipeline (220) and then connected to the nozzle. The nozzle is capable of forming a dust isolation curtain (641) between the main body (231) and the cutting head (233) of the excavator (230). The air intake end of the air intake section assembly passes through the dust isolation curtain (641) and then extends into the head area where the cutting head (233) is located.

7. The exhaust ventilation system for the excavation working face according to claim 3, characterized in that: The return air bypass (300) is provided with two air doors (310), at least one of the two air doors (310) is in a closed state, for isolating the main air flow between the excavation working face (200) and the return air lane (400) in the mining area and the passing of pedestrians.

8. A method for using an exhaust ventilation system on a tunneling working face, characterized in that: The exhaust ventilation system for the excavation working face according to claim 4 is used to discharge gas, comprising the following steps: S210 checks the gas concentration of the exhaust fan unit (500) and its switch. If the gas concentration does not exceed 0.5%, opens the first stop valve on the first three-way valve. S220: The exhaust fan unit (500) is turned on, and the detection stop valve (712) is opened at the same time. The gas concentration of the mixed gas of the gas extracted from the head area of the excavation working face (200) and the gas entering from the first stop valve is detected through the gas detection hole (711), and the flow rate of the gas extracted from the head area is controlled through the flow valve (613) to ensure that the gas concentration of the mixed gas in the return air duct (710) does not exceed 1.5%; S230: As high-concentration gas is discharged from the excavation working face (200), the flow rate of gas extracted from the head area is gradually increased through the flow valve (613), and the first stop valve is gradually closed to reduce the flow rate of gas entering through the first stop valve; S240 When the flow valve (613) is opened to the maximum and the first stop valve is completely closed, the gas in the extraction pipe of the return air section assembly gradually decreases from the highest concentration of 1.5% to below 1% or the normal gas concentration of the excavation working face (200). After maintaining this concentration for a certain period of time, the gas concentration in the entire tunnel is checked. If the gas concentration does not exceed 1%, the gas discharge of the excavation working face (200) is completed. S250: Completely close the first stop valve and close the detection stop valve (712).

9. A method for using an exhaust ventilation system on a tunneling working face, characterized in that: When the excavation working face (200) is excavated into place and full-pressure ventilation is formed, the excavation working face exhaust ventilation system according to claim 4 is used to extract gas, comprising the following steps: S310: dismantle the exhaust fan unit (500) of the exhaust ventilation system, connect the extraction pipes on both sides of the exhaust fan unit (500) with the extraction pipe; connect the outlet of the return air section extraction pipe to the extraction pipeline (410) in the mining area through the extraction stop valve (411); S320 connects the fracture zone borehole, goaf extraction pipe or other extraction borehole in the excavation working face (200) to the pipe mouth of the extraction pipe of the excavation working face (200) or the nearest tee (611), and opens the extraction stop valve (411).

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