CN111219203B - Gas emission system of auxiliary tunnel - Google Patents
Gas emission system of auxiliary tunnel Download PDFInfo
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- CN111219203B CN111219203B CN202010204675.3A CN202010204675A CN111219203B CN 111219203 B CN111219203 B CN 111219203B CN 202010204675 A CN202010204675 A CN 202010204675A CN 111219203 B CN111219203 B CN 111219203B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- Geochemistry & Mineralogy (AREA)
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a gas emission system of an auxiliary tunnel, which comprises a vent communicated with the auxiliary tunnel, wherein the vent can be used for being placed into a storage device, the storage device is provided with a valve, a gas concentration acquisition component is arranged in the auxiliary tunnel, the valve and the gas concentration acquisition component are both communicated with a control system, the control system controls the valve to be opened and closed according to acquisition data of the gas concentration acquisition component, and the valve of the storage device can release gas when being opened. The device can effectively reduce the gas concentration in the closed auxiliary tunnel, avoid gas explosion risk, avoid accidents, improve the safety of tunnel operation, ensure personnel and property safety, effectively save labor cost, and is scientific and efficient, thereby having good application prospect.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a gas discharge system for assisting an underground tunnel.
Background
The gas is a general term for various harmful gases overflowing from a coal seam or a rock stratum, and the main component of the gas is methane, so that the methane is inflammable and has explosion danger, and huge potential safety hazards are caused to the construction and operation of a tunnel.
In the prior art, the gas control in the tunnel is mainly carried out by adopting a mode of combining plugging and ventilation in the tunnel, and the main measures comprise: (1) The tunnel lining adopts coiled materials such as a waterproof layer and the like to seal water and air in a full ring manner; (2) improving the impermeability of the lining concrete; (3) forced ventilation is performed in the tunnel according to the gas concentration. Because the tunnel mainly adopts a blocking mode to prevent and treat gas, only a very small amount of gas behind the lining is led out through permeation and the drainage structure of the existing tunnel, a large amount of gas is actually gathered behind the lining, the water pressure and the gas pressure behind the lining are raised, and finally the gas finally invades the normal operation space of the tunnel to generate potential safety hazards and even cause accidents. The gas led out through the existing tunnel drainage structure mixes water and gas in the drainage structure, circulates in the whole longitudinal direction at the bottom of the tunnel, and actually increases the risk of gas escape although the gas is only trace.
Similarly, after the tunnel is built, the auxiliary tunnel of the tunnel is often plugged by a plugging wall at the opening of the tunnel, if gas in rock layers of the auxiliary tunnel escapes and gathers in the auxiliary tunnel, huge potential safety hazards can be brought, however, the auxiliary tunnel must be plugged during the operation of the tunnel, the gas in the auxiliary tunnel is difficult to discharge, and the safe operation of the tunnel can be seriously endangered once explosion occurs.
Disclosure of Invention
The invention aims to overcome the defects that the explosion risk is caused, even safety accidents are caused, the safe operation of a tunnel is seriously endangered and the like because gas is possibly accumulated in an auxiliary tunnel blocked in the operation period of the existing tunnel, and provides a gas emission system and a gas emission method of the auxiliary tunnel.
In order to achieve the above object, the present invention provides the following technical solutions:
The utility model provides a gas drainage system of supplementary tunnel, contains the vent of the supplementary tunnel of intercommunication, the vent can be used for putting into storage device, storage device has the valve, be equipped with gas concentration collection part in the supplementary tunnel, valve and gas concentration collection part all communicate control system, control system is according to gas concentration collection part's collection result control the valve is opened and close, can release gas when storage device's valve is opened.
According to the gas emission system of the auxiliary tunnel, the storage device is placed into the auxiliary tunnel through the ventilation opening communicated with the auxiliary tunnel, the gas concentration acquisition component can acquire gas concentration data in the auxiliary tunnel in real time or at intervals, when the gas concentration data exceeds the preset limit value, the control system controls the valve of the storage device to open and release gas, so that the air pressure of the auxiliary tunnel is increased, and then the air pressure is discharged from the ventilation opening, so that the gas concentration of the auxiliary tunnel is reduced, when the stock of the storage device is insufficient, the storage device can be continuously increased through the ventilation opening, so that the gas emission in the auxiliary tunnel is continuously ensured, the gas emission risk in the closed auxiliary tunnel can be effectively reduced, accidents are avoided, the safety of tunnel operation is improved, the property safety of personnel is ensured, the labor cost is effectively saved, and the gas emission system is scientific and efficient, and has good application prospects.
Preferably, the gas released by the storage device comprises nitrogen or an inert gas or air.
By adopting the arrangement mode, the air pressure in the auxiliary tunnel can be increased by releasing nitrogen or inert gas or air so as to discharge the gas in the auxiliary tunnel, thereby reducing the gas concentration.
Preferably, the gas concentration acquisition component comprises a plurality of gas concentration acquisition components, and all the gas concentration acquisition components are uniformly distributed on the upper part of the inner wall of the auxiliary tunnel.
By adopting the setting mode, the accuracy of the monitoring data is improved.
Preferably, the pit bottom of the auxiliary tunnel is an inclined plane, and the tail end of the auxiliary tunnel is lower than one end of the auxiliary tunnel, which is provided with the plugging wall.
By adopting the arrangement mode, namely when the auxiliary tunnel is in the form of a parallel pilot pit of an inclined shaft and a downhill slope, the storage device can roll into the tail end of the auxiliary tunnel along the ground, so that the gas emission efficiency and effect are improved.
Preferably, a chute is arranged in the auxiliary tunnel, the chute is arranged below the ventilation opening, and the tail end of the chute is lower than one end of the chute, which is close to the ventilation opening.
If the auxiliary tunnel is a horizontal tunnel or other parallel guide pits, or more sundries are on the ground of the tunnel, the storage device can slide to the tail end of the chute conveniently by adopting the arrangement mode, so that the gas can be released at the end of the auxiliary tunnel, and the gas discharging efficiency and effect can be improved.
Preferably, the ventilation opening is positioned above the blocking wall of the auxiliary tunnel, and the direction of the ventilation opening is perpendicular to the perennial wind direction at the ventilation opening.
Because the relative molecular mass of methane is smaller, the arrangement mode is beneficial to the discharge of gas, and simultaneously, the external gas is prevented from flowing back into the auxiliary tunnel due to wind direction, and the external natural wind can flow conveniently to generate negative pressure so as to suck out the air in the auxiliary tunnel.
Preferably, the device further comprises a plurality of oxygen concentration acquisition components, and all the oxygen concentration acquisition components are uniformly distributed on the inner wall of the auxiliary tunnel.
Because the explosion concentration limit is related to the oxygen volume fraction in the air in the auxiliary tunnel, the oxygen concentration acquisition component is additionally arranged, so that the explosion concentration limit can be determined more easily, and the gas throwing time and the gas throwing volume can be arranged more scientifically and reasonably.
Preferably, the control system is a PLC controller.
The gas emission method of the auxiliary tunnel comprises the following steps of:
a. The gas concentration acquisition component acquires gas concentration data in the auxiliary tunnel, and when the gas concentration data is continuously greater than or equal to a first preset threshold value in a first preset period, the control system controls the valve of the storage device to be opened;
b. After the storage device releases gas, when the gas concentration data is continuously smaller than a second preset threshold value in a second preset period, the control system controls the valve of the storage device to be closed;
c. Repeating steps a-b;
By adopting the gas emission method of the auxiliary tunnel, when the gas concentration data in the auxiliary tunnel is monitored and continuously exceeds or equals to the first preset threshold value in the first preset period, the valve of the storage device put into the auxiliary tunnel is controlled to be opened so as to increase the air pressure in the auxiliary tunnel, thereby exhausting the gas from the ventilation opening and further reducing the gas concentration of the auxiliary tunnel, when the gas concentration data is continuously less than the second preset threshold value in the second preset period, the explosion risk is eliminated, the valve of the storage device is controlled to be closed, the gas is stopped to be released, the steps are repeatedly carried out, the cyclic monitoring and the exhausting of the gas in the auxiliary tunnel can be realized for a long time, the occurrence of explosion accidents is effectively avoided, the safety of the tunnel operation is improved, the personnel property safety is ensured, the special personnel on duty maintenance is not required, the maintenance cost is low, the safety benefit is high, and the method is particularly suitable for tunnel engineering in remote areas.
Preferably, the first preset threshold is a methane explosion limit concentration in the auxiliary tunnel, and the second preset threshold is smaller than the first preset threshold.
Because the main component of the gas is alkane, wherein methane accounts for most of the methane, the adoption of the methane explosion limit concentration is beneficial to simplifying the monitoring link difficulty; meanwhile, as the explosion also needs open fire, the methane explosion limit concentration is used as the first preset threshold value, so that the emission times and the required gas release amount can be effectively reduced, and the maintenance cost is reduced.
The method for calculating the addition quality of liquid nitrogen is applied to the method for discharging the gas of the auxiliary tunnel, which is any one of the above, wherein the storage device is a liquid nitrogen tank, the required liquid nitrogen quality is calculated by m i=28（g/mol）﹡Vi/n, wherein m i represents the i-th required liquid nitrogen quality, n represents the gas molar volume,V i represents the required nitrogen volume at the ith time, B i represents the methane explosion limit concentration in the auxiliary tunnel at the ith time, K i represents the second preset threshold at the ith time,Representing the total volume of gas in the auxiliary gallery.
The storage device is a liquid nitrogen tank, namely, the liquid nitrogen is volatilized to extrude the gas in the auxiliary tunnel, so that the storage device is safe, clean and environment-friendly, but the air composition in the auxiliary tunnel can be changed, the methane explosion limit concentration can be further changed, the mass of the required liquid nitrogen is calculated according to the mode, the liquid nitrogen can be added scientifically and reasonably, the waste or the deficiency of the liquid nitrogen is avoided, the cost of manpower and material resources is effectively saved, and the emission effect is ensured.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. The gas emission system of the auxiliary tunnel can effectively reduce the gas concentration in the closed auxiliary tunnel, avoid the risk of gas explosion, avoid causing accidents, improve the safety of tunnel operation, ensure the safety of personnel and property, effectively save labor cost, be scientific and efficient, and have good application prospect.
2. The gas emission method of the auxiliary tunnel can realize the circulation monitoring and the emission of the gas in the auxiliary tunnel for a long time, effectively prevent explosion accidents, improve the safety of tunnel operation, ensure the property safety of personnel and property, and besides the manual addition of a storage device, the gas emission method of the auxiliary tunnel does not need special personnel on duty maintenance, has low maintenance cost and high safety benefit, and is particularly suitable for tunnel engineering in remote areas.
3. By adopting the calculation method of the adding quality of the liquid nitrogen, which is disclosed by the invention, the liquid nitrogen can be scientifically and reasonably added by adding the liquid nitrogen, so that the waste or deficiency of the liquid nitrogen is avoided, the cost of manpower and material resources is effectively saved, and the emission effect is ensured.
Drawings
FIG. 1 is a schematic diagram of a gas drainage system for an auxiliary tunnel according to the present invention;
Fig. 2 is a schematic diagram of a gas exhaust system for assisting in an excavation according to embodiment 2.
The marks in the figure: 1-auxiliary tunnel, 11-plugging wall, 12-chute, 2-vent, 3-storage device, 4-gas concentration acquisition component.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and specific examples. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, the gas emission system of the auxiliary tunnel according to the present invention comprises a ventilation opening 2 communicated with the auxiliary tunnel 1, preferably, the ventilation opening 2 is located above a blocking wall 11 of the auxiliary tunnel 1, and the direction of the ventilation opening 2 is perpendicular to the perennial wind direction at the position of the ventilation opening 2, so as to facilitate the discharge of methane gas, and simultaneously prevent external gas from flowing backward into the auxiliary tunnel 1 due to wind direction, and facilitate the flow of external natural wind to generate negative pressure so as to suck out air in the auxiliary tunnel.
The size requirement of the ventilation opening 2 can be put into the storage device 3, the storage device 3 can store nitrogen, inert gas or air, namely, the storage device 3 can be a liquid nitrogen tank, a high-pressure nitrogen steel bottle, an inert gas tank or a compressed air tank, the storage device 3 is provided with a valve, such as an electromagnetic valve, when the valve of the storage device 3 is opened, the gas can be released, so that the air pressure in the auxiliary tunnel 1 is increased, the gas in the auxiliary tunnel 1 is discharged, the gas concentration is reduced, and when the storage device 3 is insufficient, the storage device 3 can be continuously increased through the ventilation opening 2, so that the gas discharge in the auxiliary tunnel 1 is continuously ensured.
The auxiliary tunnel 1 is internally provided with a gas concentration acquisition component 4, the gas concentration acquisition component 4 can acquire gas concentration data in the auxiliary tunnel 1 in real time or at intervals, and as methane occupies most of gas components, only the concentration of methane gas can be acquired, such as an MQ-4 gas sensor, the gas concentration acquisition component 4 comprises a plurality of gas concentration acquisition components, all the gas concentration acquisition components 4 are uniformly distributed on the upper part of the inner wall of the auxiliary tunnel 1, the accuracy of monitoring data is improved, the valve and the gas concentration acquisition component 4 are respectively connected with a control system in a wireless communication manner, and the control system is a PLC (programmable logic controller) or a computer and controls the opening and closing of the electromagnetic valve according to the acquisition result of the gas concentration acquisition component 4.
In this embodiment, for example, the pit bottom of the auxiliary tunnel 1 is an inclined plane, the tail end of the auxiliary tunnel 1 is lower than one end of the auxiliary tunnel 1 provided with a blocking wall 11, that is, the auxiliary tunnel 1 is in a parallel pilot pit of an inclined shaft and a downhill, the storage device 3 is placed into the auxiliary tunnel 1 through the ventilation opening 2, the storage device 3 can roll into the tail end of the auxiliary tunnel 1 along the ground, and gas is released from the tail end of the auxiliary tunnel 1, so as to improve the efficiency and effect of gas emission.
In addition, a plurality of oxygen concentration acquisition components can be additionally arranged, for example, a plurality of GYH25 type oxygen sensors are uniformly distributed on the inner wall of the auxiliary tunnel 1, and the oxygen concentration acquisition components are additionally arranged due to the fact that the explosion concentration limit is related to the oxygen volume fraction in the air in the auxiliary tunnel, so that the explosion concentration limit can be more conveniently and more easily determined, and the throwing time and the throwing volume of nitrogen and inert gas can be more scientifically and reasonably arranged.
The device can effectively reduce the gas concentration in the closed auxiliary tunnel, avoid gas explosion risk, avoid accidents, improve the safety of tunnel operation, ensure personnel and property safety, effectively save labor cost, and is scientific and efficient, thereby having good application prospect.
Example 2
As shown in fig. 2, the gas emission system of the auxiliary tunnel according to the present invention has a structure substantially the same as that of the embodiment 1, and is different in that, if the auxiliary tunnel 1 is a horizontal tunnel or other parallel guide pits, or has more sundries on the ground, a chute 12 is disposed in the auxiliary tunnel 1, the chute 12 is disposed in a through length manner, the chute 12 is disposed below the ventilation opening 2, the tail end of the chute 12 is lower than one end of the chute 12 near the ventilation opening 2, and the storage device 3 slides to the tail end of the auxiliary tunnel 1 through the chute 12, so as to facilitate gas emission at the end of the auxiliary tunnel 1, and improve the efficiency and effect of gas emission.
Example 3
The gas emission method of the auxiliary tunnel of the invention comprises a gas emission system applying the auxiliary tunnel according to any one of the embodiments 1-2, and comprises the following steps:
a. The gas concentration acquisition component 4 acquires gas concentration data in the auxiliary tunnel 1, and when the gas concentration data is continuously greater than or equal to a first preset threshold value in a first preset period, the control system controls the valve of the storage device 3 to be opened;
b. After the storage device 3 releases gas, when the gas concentration data is continuously smaller than a second preset threshold value in a second preset period, the control system controls the valve of the storage device 3 to be closed;
c. repeating steps a-b.
Because the main component of the gas is alkane, wherein methane accounts for most of the methane, if the methane concentration is collected by the gas concentration collecting component 4, the methane explosion limit concentration is adopted for the gas explosion limit concentration, so that the difficulty of a monitoring link is simplified; meanwhile, since the explosion requires open fire even if the explosion limit concentration is reached, the methane explosion limit concentration is used as the first preset threshold value, so that the emission times and the required gas release amount can be effectively reduced, and the maintenance cost can be reduced.
The gas concentration data in the auxiliary tunnel 1 is monitored through the gas concentration acquisition component 4, when the gas concentration data is continuously greater than or equal to a first preset threshold value in a first preset period, the first preset period can be one week, 15 days, one month, and the maximum time is not more than 12 months, if the methane concentration data is continuously more than 5% (explosion limit concentration of methane) in one month, or the methane concentration data is 2 times of 5%, namely, the gas is required to be input into the storage device 3 to be discharged, the control system controls the valve of the storage device 3 to be opened, the methane concentration data is reduced along with the release of the gas, and when the methane concentration data is smaller than a second preset threshold value, the second preset threshold value is determined according to actual needs, for example, the second preset threshold value is 0-40% of the first preset threshold value, and then the control system controls the valve of the storage device 3 to be closed. Then, along with the continuous escape of the gas, when the gas concentration acquisition component 4 monitors that the methane concentration data is continuously greater than or equal to a first preset threshold value in a first preset period for the second time, the control system controls the storage device 3 to release the gas for the second time, when the methane concentration data is less than the second preset threshold value for the second time, the control system controls the storage device 3 to stop releasing the gas, and the steps are repeatedly performed, so that the circulating monitoring and the discharging of the gas in the auxiliary tunnel 1 can be realized for a long time, explosion accidents are effectively stopped, the safety of tunnel operation is improved, the property safety of personnel is ensured, no special maintenance is required except for manually adding the storage device 3, the maintenance cost is low, the safety benefit is high, and the method is particularly suitable for tunnel engineering in remote areas.
Taking nitrogen filling as an example, if the storage device 3 is a liquid nitrogen tank, the calculation method of the required liquid nitrogen mass is as follows:
mi=28（g/mol）﹡Vi/n；
Wherein m i represents the i-th required liquid nitrogen mass, n represents the gas molar volume, V i represents the volume of nitrogen required for the ith time, B i represents the methane explosion limit concentration in the auxiliary tunnel 1 for the ith time, K i represents the second preset threshold for the ith time,Representing the total volume of gas in the auxiliary gallery 1.
Specifically, when the methane concentration acquisition component monitors that the methane concentration in the corresponding period in the auxiliary tunnel 1 is higher than the initial explosion limit concentration B 1 =5% for the first time, 5% is a common experimental value; it may also be assumed that no gas exists in the auxiliary tunnel after the tunnel is built, the gas in the auxiliary tunnel 1 is air, and is composed of 21% oxygen and 78% other gases, the explosion limit concentration of methane is B i=0.55Ci,Ci, which is the chemical theoretical volume fraction of methane when the methane is completely combusted, if the oxygen volume fraction in the air is calculated by 21%, C 1 =0.21/(0.21+p), p is the molar ratio of oxygen to methane when the methane is completely combusted, and p=2 is obtained by CH 4+2O2→CO2+2H2 O, so as to obtain B 1 =5.2%.
Adding nitrogen into the auxiliary tunnel 1, opening a valve of a liquid nitrogen bottle, putting the liquid nitrogen bottle into the auxiliary tunnel from the position of the vent 2, or putting the liquid nitrogen bottle with an electromagnetic valve into the auxiliary tunnel from the position of the vent 2, remotely controlling the electromagnetic valve to volatilize the liquid nitrogen bottle to release nitrogen after the liquid nitrogen bottle rolls into the auxiliary tunnel, and calculating according to the molar volume of gas at normal temperature and normal pressure, wherein the mass of the liquid nitrogen added into the auxiliary tunnel 1 for the first time is m 1=28（g/mol）*V1/22.4,V1=（5%-K1 V 1 is the first required nitrogen volume, K 1 is a second preset threshold for the first time,Representing the total volume of gas in the auxiliary gallery 1, and when the methane concentration data is smaller than K 1, the control system controls the storage device 3 to stop gas release.
When the methane concentration acquisition component monitors that the methane concentration in the corresponding period in the auxiliary gallery 1 is higher than the second explosion limit concentration B 2,B2=0.55C2,C2 for the second time, the methane concentration acquisition component acquires the methane concentration in the auxiliary gallery 1 according to the condition thatCalculation and then the ability to bind m 2=28（g/mol）*V2/22.4,V2=（B2-K2 based on the second K 2 And B 2, calculating the mass m 2 of liquid nitrogen required for the second time, then adding liquid nitrogen with corresponding mass into the auxiliary tunnel 1, repeating the steps, and being convenient for obtaining the required nitrogen amount for each time according to calculation so as to scientifically and reasonably put in, and particularly for tunnel engineering in remote areas, reasonably arranging manual input. If the oxygen concentration acquisition component is arranged in the auxiliary tunnel 1, the oxygen volume fraction in the calculation can be replaced by actual monitoring data for calculation.
Of course, if the storage device 3 is a compressed air tank, the composition of air is not changed by the gas released by exhausting the gas each time, and the methane explosion limit concentration of the following 2 nd and 3 … th times is unchanged, that is, the first preset threshold value is not changed, the second preset threshold value is also unchanged, and the volume of air required for reaching the second preset threshold value each time is also kept consistent without considering the influence of temperature and air pressure.
The storage device 3 may be filled with inert gas, and may exhaust gas, and when the amount of inert gas in the auxiliary tunnel 1 increases to a certain value, the gas may not explode, and the auxiliary tunnel 1 may be effectively prevented from gas explosion risk.
Of course, the gas may be discharged by adding different gases each time.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The calculation method of the addition quality of the liquid nitrogen is characterized by being applied to a gas emission system of an auxiliary tunnel, wherein the gas emission system comprises a ventilation opening (2) communicated with the auxiliary tunnel (1), the ventilation opening (2) can be used for being placed into a storage device (3), the storage device (3) is provided with a valve, a gas concentration acquisition component (4) is arranged in the auxiliary tunnel (1), the valve and the gas concentration acquisition component (4) are both communicated with a control system, the control system controls the valve to be opened and closed according to the acquisition result of the gas concentration acquisition component (4), and the valve of the storage device (3) can release gas when being opened;
The gas emission method applied to the auxiliary tunnel comprises the following steps of:
a. The gas concentration acquisition component (4) acquires gas concentration data in the auxiliary tunnel (1), and when the gas concentration data is continuously larger than or equal to a first preset threshold value in a first preset period, the control system controls the valve of the storage device (3) to be opened, wherein the first preset threshold value is the methane explosion limit concentration in the auxiliary tunnel (1);
b. After the storage device (3) releases gas, when the gas concentration data is continuously smaller than a second preset threshold value in a second preset period, the control system controls the valve of the storage device (3) to be closed;
c. Repeating steps a-b;
The storage device (3) is a liquid nitrogen tank, the required liquid nitrogen mass is calculated by m i=28（g/mol）﹡Vi/n, wherein m i represents the i-th required liquid nitrogen mass, n represents the gas molar volume, V i represents the required nitrogen volume at the ith time, B i represents the methane explosion limit concentration in the auxiliary tunnel (1) at the ith time, K i represents the second preset threshold value at the ith time,Representing the total volume of gas in the auxiliary gallery (1).
2. The method of claim 1, wherein the second preset threshold is less than the first preset threshold.
3. Method according to claim 1 or 2, characterized in that the pit bottom of the auxiliary tunnel (1) is an inclined plane, the tail end of the auxiliary tunnel (1) being lower than the end of the auxiliary tunnel (1) provided with the blocking wall (11).
4. Method according to claim 1 or 2, characterized in that a chute (12) is provided in the auxiliary tunnel (1), the chute (12) being provided below the ventilation opening (2), the tail end of the chute (12) being lower than the end of the chute (12) near the ventilation opening (2).
5. The method according to claim 1 or 2, characterized in that the gas concentration collecting means (4) comprise several, all the gas concentration collecting means (4) being evenly distributed on the upper part of the inner wall of the auxiliary tunnel (1).
6. Method according to claim 1 or 2, characterized in that the ventilation opening (2) is located above the blocking wall (11) of the auxiliary tunnel (1), the ventilation opening (2) being oriented perpendicularly to the perennial wind direction at the ventilation opening (2).
7. The method according to claim 1 or 2, further comprising a number of oxygen concentration collecting members, all of which are evenly distributed on the inner wall of the auxiliary tunnel (1).
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| CN112012786B (en) * | 2020-09-11 | 2022-04-26 | 安徽理工大学 | Low-gas working face goaf totally-enclosed inert gas replacement method |
| CN112782368A (en) * | 2021-01-04 | 2021-05-11 | 北京市环境保护科学研究院 | Test system and method for industrial organic waste gas collection efficiency evaluation |
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