A coal mine ventilation system

Abstract

The utility model discloses a kind of coal mine ventilation system of coal mine, including the air intake shaft, air intake lane, mine working face, air return lane, air return shaft and the suction ventilation assembly connected with air return shaft in turn;The suction ventilation assembly includes air chamber, gradually expanding section, dust collector, gradually reducing section, straight cylinder section and ventilator connected with air return shaft outlet in turn, the top of air return shaft is connected with air chamber by communication passage, and the ventilator includes main ventilator and auxiliary ventilator, and the main ventilator and auxiliary ventilator are connected with straight cylinder section by three-way air door;The end of air chamber close to gradually reducing section is provided with gas dilution piece.The utility model is simple in structure, and it is reasonable in design to set dust collector to suction gas dust removal at ventilator, set gas dilution piece to carry out dilution in advance to the gas of suction gas, avoid fan impeller damage, improve ventilation efficiency and service life, and it is strong in practicality.

Description

Technical Field

[0001] This utility model belongs to the field of mine ventilation technology, and in particular relates to a coal mine ventilation system. Background Technology

[0002] Mine ventilation involves continuously supplying fresh air from the surface to the mine working face. Ventilation can reduce the content of harmful gases underground, provide the oxygen needed by underground personnel, and provide good working conditions for underground coal mine construction. Therefore, mine ventilation is very important for ensuring mine safety.

[0003] Currently, mine ventilation systems are typically equipped with two fans, one in operation and one on standby, to ensure the normal operation of the coal mine ventilation system. However, during the extraction process, the fans directly draw in air containing dust. As a result, the dust in the air wears down the fan impeller, reducing ventilation efficiency and service life. In addition, if the methane content is high during the extraction process, methane will accumulate on the fan blades, leading to blade corrosion and damage, affecting the normal operation of the fan. Furthermore, the accumulation of methane gas in the ventilation ducts creates resistance, slowing down the airflow and reducing the ventilation efficiency of the main fan.

[0004] Therefore, there is currently a lack of a well-designed coal mine ventilation system that includes a dust collector at the ventilation fan to remove dust from the drawn gas, and a gas dilution device to pre-dilute the gas in the drawn gas, thereby preventing damage to the fan impeller and improving ventilation efficiency and service life. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a coal mine ventilation system that addresses the shortcomings of the prior art. The system has a simple structure and reasonable design. A dust collector is installed at the ventilation fan to remove dust from the drawn gas, and a gas dilution component is installed to dilute the gas in the drawn gas in advance, thereby avoiding damage to the fan impeller, improving ventilation efficiency and service life, and making it highly practical.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a coal mine ventilation system, characterized in that: it includes an intake shaft, an intake roadway, a mine working face, a return air roadway, a return air shaft, and a suction ventilation component connected to the return air shaft in sequence;

[0007] The exhaust ventilation assembly includes an air chamber, a gradually expanding section, a dust collector, a gradually contracting section, a straight section, and a ventilation fan, which are connected in sequence to the outlet of the return air shaft. The top of the return air shaft is connected to the air chamber via a connecting passage.

[0008] The ventilation fan includes a main ventilation fan and an auxiliary ventilation fan, both of which are connected to the straight section via three ventilation dampers.

[0009] A gas dilution component is provided at the end of the ventilation shaft near the tapering section. The gas dilution component includes a connecting pipe embedded in the side wall of the ventilation shaft and connected to the ventilation shaft, a dilution pipe connected to the connecting pipe, and a local dilution fan connected to the dilution pipe.

[0010] The above-mentioned coal mine ventilation system is characterized in that: the outlet of the straight section is connected to a three-ventilation door, the inlet of the main ventilator is connected to one outlet of the three-ventilation door through a first connecting channel, the inlet of the auxiliary ventilator is connected to another outlet of the three-ventilation door through a second connecting channel, a first butterfly valve is provided on the first connecting channel, and a second butterfly valve is provided on the second connecting channel.

[0011] The above-mentioned coal mine ventilation system is characterized in that: a first wind pressure sensor is installed in the expanding section, and a second wind pressure sensor is installed in the contracting section;

[0012] The dust collector is a bag filter.

[0013] The above-mentioned coal mine ventilation system is characterized in that: a third butterfly valve is installed in the dilution pipe; the outlets of the local dilution fan, the main ventilator and the auxiliary ventilator are connected to a horizontal pipe and a subsequent pipe arranged perpendicular to the horizontal pipe; a first gas sensor is installed in the ventilation shaft; a second gas sensor is installed in the horizontal pipe; and a check valve is installed on the horizontal pipe.

[0014] A metal mesh flame arrester is installed near the outlet of the horizontal pipe.

[0015] The above-mentioned coal mine ventilation system is characterized in that: a heating mechanism is embedded in the ventilation shaft, the ventilation shaft is a concrete ventilation shaft, connecting flanges are embedded at both ends of the ventilation shaft, the heating mechanism includes a pipe network embedded in the upper, lower, left, and right sides of the ventilation shaft and connected in sequence, the inlet of the pipe network is connected to an inlet pipe, the outlet of the pipe network is connected to an outlet pipe, and the inlet pipe is connected to an air heater.

[0016] This utility model has the following advantages compared with the prior art:

[0017] 1. This utility model has a simple structure and reasonable design. By sequentially setting a gradually expanding section, a dust collector, a gradually contracting section, and a straight section between the ventilation shaft and the ventilation fan, the dust collector is connected. The dust collector removes dust from the drawn-in gas, preventing dust from wearing down the impellers of the main and auxiliary ventilation fans, thus improving efficiency and service life. Furthermore, by setting the gradually expanding section, the gradually contracting section, and the straight section, turbulence and local resistance are reduced, thereby avoiding significant impact on the system air volume, maintaining stable air volume, and meeting the requirements of the coal mine ventilation system.

[0018] 2. The ventilation shaft of this utility model is equipped with a gas dilution component to pre-discharge and dilute the gas in the drawn gas. Gas with a large content is drawn in by a local dilution fan, avoiding the accumulation of gas on the blades of the main and auxiliary ventilation fans, which would cause corrosion and damage and affect the normal operation of the main and auxiliary ventilation fans. It also avoids the accumulation of gas that would slow down the airflow speed, thus improving ventilation efficiency.

[0019] In summary, this utility model has a simple structure and reasonable design. It sets up a dust collector at the ventilation fan to remove dust from the drawn gas and sets up a gas dilution component to dilute the gas in the drawn gas in advance, thereby avoiding damage to the fan impeller, improving ventilation efficiency and service life, and is highly practical.

[0020] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the ventilation shaft, dust collector, and ventilator of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the gas dilution component of this utility model.

[0024] Figure 4 This is a schematic diagram of the structure of the ventilation shaft of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1—Intake airway; 2—Return airway; 3—Mine working face;

[0027] 4—Dust collector; 41—Converging section; 42—Straight section;

[0028] 43—First wind pressure sensor; 44—Second wind pressure sensor; 45—Three ventilation dampers;

[0029] 5—Diverging section; 6—Wind tunnel; 61—Connecting flange;

[0030] 62—Pipeline network; 63—Inlet pipe; 64—Outlet pipe;

[0031] 65—First gas sensor; 71—Local dilution fan; 72—Connecting pipe;

[0032] 73—Dilution pipeline; 74—Third butterfly valve; 75—Horizontal pipeline;

[0033] 76—Metal mesh flame arrester; 77—Second gas sensor; 78—Subsequent piping;

[0034] 79—Check valve; 8—Connecting passage; 9—Intake shaft;

[0035] 10—Return air shaft; 11—Main ventilation fan; 12—First connecting passage;

[0036] 13—First butterfly valve; 21—Auxiliary ventilator; 22—Second connecting channel;

[0037] 23—Second butterfly valve. Detailed Implementation

[0038] like Figures 1 to 4 As shown, this utility model includes an intake air shaft 9, an intake airway 1, a mine working face 3, a return airway 2, a return air shaft 10 connected in sequence, and a suction ventilation assembly connected to the return air shaft 10.

[0039] The exhaust ventilation assembly includes an air chamber 6, a gradually expanding section 5, a dust collector 4, a gradually contracting section 41, a straight section 42, and a ventilator, which are sequentially connected to the outlet of the return air shaft 10. The top of the return air shaft 10 is connected to the air chamber 6 via a connecting passage 8.

[0040] The ventilation fan includes a main ventilation fan 11 and an auxiliary ventilation fan 21, both of which are connected to the straight section 42 via three ventilation doors 45.

[0041] A gas dilution component is provided at the end of the ventilation shaft 6 near the tapering section 41. The gas dilution component includes a connecting pipe 72 embedded in the side wall of the ventilation shaft 6 and connected to the ventilation shaft 6, a dilution pipe 73 connected to the connecting pipe 72, and a local dilution fan 71 connected to the dilution pipe 73.

[0042] In this embodiment, the outlet of the straight section 42 is connected to the three ventilation doors 45, the inlet of the main ventilator 11 is connected to one outlet of the three ventilation doors 45 through the first connecting channel 12, and the inlet of the auxiliary ventilator 21 is connected to the other outlet of the three ventilation doors 45 through the second connecting channel 22. A first butterfly valve 13 is provided on the first connecting channel 12, and a second butterfly valve 23 is provided on the second connecting channel 22.

[0043] In this embodiment, a first wind pressure sensor 43 is provided in the expanding section 5, and a second wind pressure sensor 44 is provided in the contracting section 41.

[0044] The dust collector 4 is a bag filter dust collector.

[0045] In this embodiment, a third butterfly valve 74 is installed in the dilution pipe 73, the outlets of the local dilution fan 71, the main ventilator 11 and the auxiliary ventilator 21 are connected to a horizontal pipe 75 and a subsequent pipe 78 arranged perpendicular to the horizontal pipe 75, a first gas sensor 65 is installed in the ventilation shaft 6, a second gas sensor 77 is installed in the horizontal pipe 75, and a check valve 79 is installed on the horizontal pipe 75.

[0046] A metal mesh flame arrester 76 is installed near the outlet of the horizontal pipe 75.

[0047] In this embodiment, a heating mechanism is embedded in the ventilation shaft 6. The ventilation shaft 6 is a concrete ventilation shaft. Connecting flanges 61 are embedded at both ends of the ventilation shaft 6. The heating mechanism includes a pipe network 62 embedded in the ventilation shaft 6 and connected sequentially in the upper, lower, left, and right directions. The inlet of the pipe network 62 is connected to the inlet pipe 63, and the outlet of the pipe network 62 is connected to the outlet pipe 64. The inlet pipe 63 is connected to an air heater.

[0048] In this embodiment, a main ventilator 11 and an auxiliary ventilator 21 are provided so that when the main ventilator 11 fails, the system can be switched to the auxiliary ventilator 21 to avoid the ventilation system stopping when the main ventilator 11 fails.

[0049] In this embodiment, a first butterfly valve 13 is provided on the first connecting channel 12 so that the air volume can be dynamically adjusted through the first butterfly valve 13 when the main ventilation fan 11 is working. It can also assist in cooperating with the three ventilation doors 45 to further ensure the cut-off of the first connecting channel 12, which facilitates the maintenance of the main ventilation fan 11 or the first connecting channel 12.

[0050] The second connecting channel 22 is equipped with a second butterfly valve 23, which is used to dynamically adjust the air volume when the auxiliary fan 21 is working. It can also be used in conjunction with the three ventilation dampers 45 to further ensure the cut-off of the second connecting channel 22, so as to facilitate the maintenance of the auxiliary fan 21 or the second connecting channel 22.

[0051] In this embodiment, three ventilation doors 45 are provided to connect the main ventilation fan 11, the auxiliary ventilation fan 21 and the straight section 42, and to facilitate switching between the main ventilation fan 11 and the auxiliary ventilation fan 21.

[0052] In this embodiment, the three ventilation doors 45 can be explosion-proof hydraulic three ventilation doors with low flow resistance coefficient, reducing the energy consumption of the main fan. Moreover, the airflow direction can be directly switched by rotating the valve 180°, without the need for an additional reverse air duct, resulting in low operating costs.

[0053] In this embodiment, both the first wind pressure sensor 43 and the second wind pressure sensor 44 can refer to the GPD10(A) intrinsically safe wind pressure sensor for mining.

[0054] In this embodiment, the first wind pressure sensor 43 and the second wind pressure sensor 44 are provided to detect the wind pressure inside the wind tunnel 6 when the wind tunnel 6 and the gradually expanding section 5 are connected, and to detect the wind pressure after passing through the dust collector 4, so as to ensure that the pressure difference between the wind pressure after passing through the dust collector 4 and the wind pressure inside the wind tunnel 6 meets the ventilation requirements.

[0055] In this embodiment, the dust collector 4 is a bag filter dust collector, which produces no wastewater and allows for dust recycling. The purpose of setting up the dust collector 4 is to remove dust from the drawn gas, thereby preventing dust from wearing down the impellers of the main ventilator 11 and the auxiliary ventilator 21, reducing efficiency and service life.

[0056] Furthermore, by setting up the expanding section 5, the contracting section 41, and the straight section 42, turbulence and local resistance are reduced, thereby avoiding significant impact on the system air volume, maintaining stable air volume, and meeting the requirements of coal mine ventilation systems.

[0057] In this embodiment, a gas dilution component is installed on the ventilation shaft 6 to pre-discharge and dilute the gas in the drawn gas, preventing the accumulation of gas on the fan blades due to high gas content, which would cause corrosion and damage and affect the normal operation of the fan. It also prevents the accumulation of gas from slowing down the airflow speed, thereby improving ventilation efficiency. In addition, gas dilution can reduce the burden on the ventilation system and the risk of gas accumulation and explosion.

[0058] In this embodiment, the first gas sensor 65 is set up to detect the gas concentration in the ventilation shaft 6. If the detected gas concentration is greater than the required value, the local dilution fan 71 is operated to increase the air volume of the ventilation shaft 6, which can effectively dilute and discharge the gas and ensure mine safety.

[0059] In this embodiment, a second gas sensor 77 is provided to detect the gas concentration at the outlets of the local dilution fan 71, the main ventilator 11, and the auxiliary ventilator 21, so as to prevent the gas concentration from exceeding the required value.

[0060] The check valve 79 is installed to prevent backflow of gas or gas mixture in the horizontal duct 75 due to the disappearance of negative pressure when the local dilution fan 71, main ventilator 11, or auxiliary ventilator 21 stops working, thus improving safety. The metal mesh flame arrester 76 is installed to prevent backfire from igniting the gas, further improving safety.

[0061] In actual use, it should be noted that the mixed gas output from the subsequent pipeline 78 can be subsequently recycled and reused in accordance with the conventional environmental protection requirements for coal mines in this field.

[0062] In this embodiment, the model of air heater 1 is not limited as long as it meets the requirements. Air heater 1 is provided so that the hot air output from air heater 1 enters the pipe network 62 through inlet pipe 63 to heat the ventilation shaft 6. The heated air overflows through outlet pipe 64, forming a hot air film around the surface of the ventilation shaft 6. This reduces heat exchange between the ventilation shaft 6 and the surrounding cold air, improving the heating effect. Heating the ventilation shaft 6 prevents the airflow inside from freezing and obstructing the ventilation system, ensuring the normal operation of the ventilation system and guaranteeing safe production in the mine.

[0063] In this embodiment, the two ends of the ventilation shaft 6 are connected to the connecting channel 8 and the expanding section 5 via connecting flanges 61.

[0064] In this embodiment, it should be noted that flange connections can be used at the pipe connections, and high-temperature resistant silicone gaskets or asbestos rubber gaskets can be added to the flange connections to achieve sealed pipe connections.

[0065] In actual use, it should be noted that the selection of all other components should only meet the safety requirements for mining.

[0066] In practical use, the three ventilation doors 45 connect the ventilation shaft 6, the expanding section 5, the dust collector 4, the contracting section 41, the straight section 42, and the main ventilation fan 11. The main ventilation fan 11 operates, and the continuous negative pressure causes fresh air to flow into the coal mine through the intake shaft 9 and through the intake roadway 1 to reach the working face 3 to provide the oxygen required by the underground personnel. At the same time, the polluted gas in the coal mine is drawn into the ventilation shaft 6 through the return airway 2 and the return air shaft 10 due to the negative pressure. The polluted gas in the ventilation shaft 6 passes through the expanding section 5 and the dust collector 4 in sequence. The gas after being dusted by the dust collector 4 is discharged through the contracting section 41, the straight section 42, and the main ventilation fan 11.

[0067] Meanwhile, during the ventilation process, if the gas concentration detected by the first gas sensor 65 is greater than the required value, the third butterfly valve 74 and the local dilution fan 71 will be operated to draw in the gas. The local dilution fan 71 will draw out the polluted gas through the dilution pipe 73 and the connecting pipe 72 to achieve gas dilution in advance and avoid damage to the main ventilation fan 11.

[0068] If maintenance of the main ventilation fan 11 is required, the three ventilation doors 45 are operated to connect the ventilation shaft 6, the expansion section 5, the dust collector 4, the contraction section 41, the straight section 42, and the auxiliary ventilation fan 21. The auxiliary ventilation fan 21 will then operate, ensuring the normal operation of the ventilation system and guaranteeing the safe production of the mine.

[0069] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A coal mine ventilation system, characterized in that: It includes an intake shaft (9), an intake roadway (1), a mine working face (3), a return air roadway (2), a return air shaft (10) connected in sequence, and a suction ventilation assembly connected to the return air shaft (10); The exhaust ventilation assembly includes a ventilation shaft (6), a gradually expanding section (5), a dust collector (4), a gradually contracting section (41), a straight section (42), and a ventilation fan, which are connected in sequence to the outlet of the return air shaft (10). The top of the return air shaft (10) is connected to the ventilation shaft (6) through a connecting passage (8). The ventilator includes a main ventilator (11) and an auxiliary ventilator (21), both of which are connected to the straight section (42) through three ventilation doors (45); A gas dilution component is provided at the end of the ventilation shaft (6) near the tapering section (41). The gas dilution component includes a connecting pipe (72) embedded in the side wall of the ventilation shaft (6) and connected to the ventilation shaft (6), a dilution pipe (73) connected to the connecting pipe (72), and a local dilution fan (71) connected to the dilution pipe (73).

2. A coal mine ventilation system according to claim 1, characterized in that: The outlet of the straight section (42) is connected to a three-ventilation door (45). The inlet of the main ventilator (11) is connected to one outlet of the three-ventilation door (45) through a first connecting channel (12). The inlet of the auxiliary ventilator (21) is connected to the other outlet of the three-ventilation door (45) through a second connecting channel (22). A first butterfly valve (13) is provided on the first connecting channel (12), and a second butterfly valve (23) is provided on the second connecting channel (22).

3. A coal mine ventilation system according to claim 1, characterized in that: A first wind pressure sensor (43) is installed in the expanding section (5), and a second wind pressure sensor (44) is installed in the contracting section (41); The dust collector (4) is a bag filter.

4. A coal mine ventilation system according to claim 1, characterized in that: A third butterfly valve (74) is installed in the dilution pipe (73). The outlets of the local dilution fan (71), the main ventilator (11) and the auxiliary ventilator (21) are connected to a horizontal pipe (75) and a subsequent pipe (78) that is arranged perpendicular to the horizontal pipe (75). A first gas sensor (65) is installed in the ventilation shaft (6). A second gas sensor (77) is installed in the horizontal pipe (75). A check valve (79) is installed on the horizontal pipe (75). A metal mesh flame arrester (76) is installed near the outlet of the horizontal pipe (75).

5. A coal mine ventilation system according to claim 1, characterized in that: The ventilation shaft (6) is equipped with a heating mechanism. The ventilation shaft (6) is a concrete ventilation shaft. Connecting flanges (61) are embedded at both ends of the ventilation shaft (6). The heating mechanism includes a network of pipes (62) embedded in the ventilation shaft (6) and connected sequentially in the upper, lower, left, and right directions. The inlet of the network of pipes (62) is connected to an inlet pipe (63), and the outlet of the network of pipes (62) is connected to an outlet pipe (64). The inlet pipe (63) is connected to an air heater.

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