CN106968700B - A kind of mine ventilation system and its control method - Google Patents

Abstract

The invention discloses a kind of mine ventilation systems, including blowing shaft, for blowing to underground；Main breeze fan is installed in blowing shaft；Several air-supply tunnels, air-supply tunnel connects with blowing shaft, and air-supply is equipped with secondary breeze fan in tunnel, and the junction of air-supply tunnel and blowing shaft is equipped with air inlet adjustable ventilation door；Several return aircourses, return aircourse and air-supply tunnel correspond, and are equipped with check-valves between return aircourse and air-supply tunnel, secondary return air fan is equipped in return aircourse；Returnairshaft, for by the circulation air outlet of underground；Main return air fan is installed in returnairshaft.The present invention can improve the deficiencies in the prior art, improve the ventilation effect of mine ventilation system.

Description

A mine ventilation system and its control method

technical field

The invention relates to the technical field of mine ventilation, in particular to a mine ventilation system and a control method thereof.

Background technique

Mine ventilation system is to send the fresh air on the ground directly or after being processed by mechanical ventilation, and send it to the underground operation site through the air inlet shaft, dilute the dirty air in it, and then pass through the return air shaft directly or after air treatment Emissions to ground atmosphere. Its basic function is to provide clean air for people to breathe, dilute and eliminate harmful gases and dust generated in the production process, remove excess heat and humidity, and create a production environment suitable for human operation. Therefore, rational construction and management of a ventilation system is not only the basis for creating safe production and sanitary conditions, but also an important means to prevent various disasters, which is of great significance to ensure safe production in mines. The existing mine ventilation system has insufficient real-time and precision for the control of air supply and return air.

Contents of the invention

The technical problem to be solved by the present invention is to provide a mine ventilation system and its control method, which can solve the deficiencies of the prior art and improve the ventilation effect of the mine ventilation system.

In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

A mine ventilation system comprising,

The air supply shaft is used to supply air to the underground; the main air supply fan is installed in the air supply shaft;

Several air supply tunnels, the air supply tunnels are connected with the air supply shafts, the auxiliary air supply fans are installed in the air supply tunnels, and the air inlet adjustable dampers are installed at the joints between the air supply tunnels and the air supply shafts;

Several air return tunnels, the return air tunnels correspond to the air supply tunnels one by one, a check valve is installed between the return air tunnels and the air supply tunnels, and a secondary return air fan is installed in the return air tunnels;

The air return shaft is used to discharge the circulating air in the underground; the main return air fan is installed in the air return shaft;

Assuming that there are n total air return lanes, the numbers are arranged from the lane closest to the ground, the lane closest to the ground is No. 1 lane, and the lane farthest from the ground is No. n lane, and No. i+1 lane and n-i lane pass through The transition roadway is connected, 0≤i<n, if n is an odd number, the return air roadway in the middle position is connected to a transition roadway separately, the transition roadway is connected with the return air shaft, and the connection between the transition roadway and the return air roadway is set There is an adjustable damper for the return air, and the transition roadway is connected with the return air shaft;

Wind speed sensors are installed in the air supply shaft, air supply tunnel, return air tunnel and return air shaft, temperature sensors are respectively installed in the air supply tunnel and return air tunnel, Wind pressure sensors are respectively provided.

As a preference, a deflector is arranged at the connection between the air supply tunnel and the air supply shaft, the deflector is fixed on the edge of the air supply tunnel, and the axial angle between the deflector and the air supply tunnel is 10° to 25° .

As a preference, a groove is provided at the connection between the transition roadway and the return air shaft, the groove is fixed on the inner wall of the return air shaft, and is coaxially arranged with the corresponding transition roadway, the diameter of the groove is equal to the diameter of the transition roadway The ratio is 2:1, and the ratio of the depth to diameter of the groove is 2:3.

A control method of the above-mentioned mine ventilation system, comprising the following steps:

A. Determine the total air supply volume Q ₁ of the main air supply fan according to the air supply wind speed requirements of each roadway,

Among them, S _j is the average air supply area of the air supply tunnel, v _j is the wind speed setting value of the air supply tunnel, k ₁ is the correction coefficient, F ₁ is the average potential function of the air supply fluid, L ₁ is the flow of the air supply fluid the total length of

B. According to the total air supply volume Q ₁ determined in step A, determine the total return air volume Q ₂ of the main return air fan,

Among them, k2 is the correction coefficient, and μ is the average dynamic viscosity coefficient in the return air pipeline _;

C. The air supply volume Q _1j of the auxiliary air supply fan satisfies,

The return air volume Q _2j of the auxiliary return air fan satisfies,

and,

Among them, k ₃ is a proportional coefficient, 1<k ₃ <1.05, and k ₃ in all roadways is the same;

D. According to the deviation data between the detected value of wind pressure and temperature in each air supply tunnel and the set value, adjust the opening of the adjustable air door,

Among them, ΔA _1j is the opening adjustment of the adjustable air door, ΔP _1j is the deviation data between the wind pressure detection value and the set value in the air supply tunnel, T _1j is the temperature detection value, k ₄ and k ₅ are the ratio coefficient;

E. Adjust the return air adjustable damper according to the opening adjustment amount of the air inlet adjustable damper in the corresponding air supply tunnel and the wind pressure in the return air tunnel,

Among them, ΔA _2j is the opening adjustment amount of the return air adjustable damper, ΔP _2j is the deviation data between the wind pressure detection value and the set value in the return air tunnel, and k ₆ and k ₇ are proportional coefficients.

As a preference, the total return air volume _Q2 of the main return air fan is adjusted for feedback correction according to the adjustment of the opening of the adjustable air door and the adjustable air door of the return air,

Among them, Q′ ₂ is the total return air volume of the main return air blower fan after correction, Adjust the weighted average for the openings of all the adjustable air intake dampers, The weighted average value is adjusted for the opening of all return air adjustable dampers. The weighted rate is proportional to the ventilation flow of the corresponding roadway, and k ₈ and k ₉ are proportional coefficients.

The beneficial effects brought about by adopting the above technical solution are: the present invention first improves the ventilation structure of the roadway and designs the transition roadway to reduce the fluctuation of air volume caused by the different return air pressure of different return air roadways to the return air shaft. The deflector can reduce the deviation of the air supply volume caused by the different air supply pressures between the connection ports of different air supply tunnels in the air supply shaft. The grooves on the inner wall of the return air shaft are used to suppress the mutual disturbance between the return air flow in the roadway and the air flow in the return air shaft, and improve the return air efficiency of the return air shaft. The invention innovatively proposes a new method for controlling the air supply volume, which uses the average potential function of the air supply fluid to correct the air supply volume, and can significantly improve the control accuracy of the air supply volume without increasing the amount of calculation. Adjusting the return air volume through the supply air volume can avoid deviation between the adjustment of the return air volume and the supply air volume. The air volume of each air supply roadway and return air roadway should be reserved to maintain a margin, so as to realize the slight positive pressure of the whole system, and avoid the problem of "gas flow" between the roadways. The adjustment of the damper is used to stabilize the air pressure and temperature in the roadway. After the adjustment of the damper, the feedback adjustment of the return air volume can avoid the change of the parameter balance of the entire ventilation system due to the adjustment of the damper.

Description of drawings

Fig. 1 is a structural diagram of a specific embodiment of the present invention.

Fig. 2 is a structural diagram of the connection between the air supply roadway and the air supply shaft in a specific embodiment of the present invention.

Fig. 3 is a structural diagram of the connection between the transition roadway and the return air shaft in a specific embodiment of the present invention.

In the figure: 1. Air supply shaft; 2. Main air supply fan; 3. Air supply tunnel; 4. Secondary air supply fan; 5. Air intake adjustable damper; 6. Return air tunnel; 7. Check valve; 8 1. Secondary return air fan; 9. Return air shaft; 10. Main return air fan; 11. Adjustable return air damper; 12. Wind speed sensor; 13. Temperature sensor; 14. Wind pressure sensor; 15. Transition roadway; 16. Deflector; 17, groove; 18, bypass return air duct; 19, bypass return air fan.

Detailed ways

The standard parts used in the present invention can be purchased from the market, and the special-shaped parts can be customized according to the instructions and the accompanying drawings. The specific connection methods of each part adopt mature bolts, rivets, welding in the prior art , pasting and other conventional means, no longer described in detail here.

Referring to Figures 1-3, a specific embodiment of the present invention includes,

The air supply shaft 1 is used to supply air to the underground; the main air supply fan 2 is installed in the air supply shaft 1;

Several air supply tunnels 3, the air supply tunnel 3 is connected with the air supply shaft 1, the auxiliary air supply fan 4 is installed in the air supply tunnel 3, and the air inlet adjustable damper is installed at the connection between the air supply tunnel 3 and the air supply shaft 1 5;

A number of return air tunnels 6, the return air tunnel 6 corresponds to the air supply tunnel 3 one by one, a check valve 7 is installed between the return air tunnel 6 and the air supply tunnel 3, and a secondary return air fan 8 is installed in the return air tunnel 6 ;

The air return shaft 9 is used to discharge the circulating air in the well; the main air return fan 10 is installed in the air return shaft 9;

Assuming that there are n return airway 6 in total, the numbers are arranged from the roadway closest to the ground, the roadway closest to the ground is No. 1 roadway, and the roadway farthest from the ground is No. n roadway, and No. Connect through the transition roadway 15, 0≤i<n, if n is an odd number, then connect the return air roadway 6 in the middle to a transition roadway 15, the transition roadway 15 is connected to the return air shaft 9, and the transition roadway 15 and The connection of the air return roadway 6 is provided with an adjustable return air damper 11, and the transition roadway 15 is connected with the air return shaft 9;

Wind speed sensors 12 are respectively arranged in the air supply shaft 1, the air supply tunnel 3, the return air tunnel 6 and the return air shaft 9, and the temperature sensors 13 are respectively arranged in the air supply tunnel 3 and the return air tunnel 6. Air pressure sensors 14 are respectively arranged at the damper 5 and the return air adjustable damper 11 .

A deflector 16 is arranged at the junction of the air supply tunnel 3 and the air supply well 1, and the deflector 16 is fixed on the edge of the air supply tunnel 3, and the axial angle between the deflector 16 and the air supply tunnel 3 is 21°.

The junction of the transition roadway 15 and the return air shaft 9 is provided with a groove 17, the groove 17 is fixed on the inner wall of the return air shaft 9, and is coaxially arranged with the corresponding transition roadway 15, and the diameter of the groove 17 is the same as that of the transition roadway 15. The ratio of the diameter of the groove 17 is 2:1, and the ratio of the depth to the diameter of the groove 17 is 2:3.

A control method of the above-mentioned mine ventilation system, comprising the following steps:

A. Determine the total air supply volume Q ₁ of the main air supply fan 2 according to the air supply speed requirements of each roadway,

Among them, S _j is the average air supply area of the air supply tunnel, v _j is the wind speed setting value of the air supply tunnel, k ₁ is the correction coefficient, F ₁ is the average potential function of the air supply fluid, L ₁ is the flow of the air supply fluid the total length of

B. According to the total air supply volume Q ₁ determined in step A, determine the total return air volume Q ₂ of the main return air fan 10,

Among them, k2 is the correction coefficient, and μ is the average dynamic viscosity coefficient in the return air pipeline _;

C. The air supply volume Q _1j of the auxiliary air blower fan 4 satisfies,

The return air volume Q _2j of the auxiliary return air fan 8 satisfies,

and,

Among them, k ₃ is a proportional coefficient, 1<k ₃ <1.05, and k ₃ in all roadways is the same;

D. Adjust the opening of the air intake adjustable damper 5 according to the deviation data between the detection value and the set value of the wind pressure and temperature in each air supply tunnel 3,

Among them, ΔA _1j is the opening adjustment amount of the adjustable air door 5, ΔP _1j is the deviation data between the wind pressure detection value and the set value in the air supply tunnel 3, T _1j is the temperature detection value, k ₄ , k ₅ is the proportional coefficient;

E. Adjust the return air adjustable damper 11 according to the opening adjustment amount of the air inlet adjustable damper 5 in the corresponding air supply tunnel 3 and the wind pressure in the return air tunnel 6,

Wherein, ΔA _2j is the opening adjustment amount of the return air adjustable damper 11, ΔP _2j is the deviation data between the detected wind pressure in the return air tunnel 6 and the set value, and k ₆ and k ₇ are proportional coefficients.

The total return air volume _Q2 of the main return air fan 10 is adjusted according to the opening of the adjustable air door 5 and the adjustable return air door 11 for feedback correction,

Wherein, Q ' ₂ is the total return air volume of the main return air fan 10 after correction, Adjust the weighted average for the openings of all the air intake adjustable dampers 5, The weighted average is adjusted for the openings of all return air adjustable dampers 11, the weighted rate is proportional to the ventilation flow of the corresponding roadway, and k ₈ and k ₉ are proportional coefficients.

A bypass return air duct 18 is connected between each air supply tunnel 3 , and a bypass return air fan 19 is installed in the bypass return air duct 18 . By setting the bypass air return pipe 18, the air flow velocity in the air supply tunnel can be accelerated, and the underground air circulation rate can be improved. The bypass air return fan 19 can avoid the air backflow caused by the pressure difference between the air supply tunnels 3, and maintain the state of exhausting air outwards. At the same time, when the air volume of the auxiliary air supply fan 4 and the auxiliary return air fan 8 is adjusted, the pressure fluctuation between the air supply tunnel and the return air tunnel can be reduced by synchronously adjusting the bypass return air fan 19 .

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. A mine ventilation system, characterized in that: comprising, The air supply shaft (1) is used to supply air to the underground; the main air supply fan (2) is installed in the air supply shaft (1); Several air-supply tunnels (3), the air-supply tunnels (3) are connected with the air-supply shafts (1), and auxiliary air-supply fans (4) are installed in the air-supply tunnels (3), and the air-supply tunnels (3) are connected to the air-supply shafts (1). The joint of the well (1) is equipped with an air intake adjustable damper (5); Several return air tunnels (6), the return air tunnels (6) correspond to the air supply tunnels (3), and a check valve (7) is installed between the return air tunnels (6) and the air supply tunnels (3), A secondary return air fan (8) is installed in the air return roadway (6); The return air shaft (9) is used to discharge the circulating air in the well; the main return air fan (10) is installed in the return air shaft (9); Assuming that there are n return air lanes (6), the numbers are arranged from the lane closest to the ground, the lane closest to the ground is No. 1 lane, and the farthest lane from the ground is No. n lane, and No. i+1 lane and n-i No. roadway is connected through transition roadway (15), 0≤i<n, if n is an odd number, then the return air roadway (6) in the middle position is connected to a transition roadway (15) alone, and transition roadway (15) and The return air shaft (9) is connected, the transition roadway (15) and the return air roadway (6) are provided with a return air adjustable damper (11), and the transition roadway (15) is connected with the return air shaft (9); In the air supply shaft (1), the air supply roadway (3), the air return roadway (6) and the air return shaft (9), the wind speed sensor (12) is respectively arranged, and the air supply roadway (3) and the air return roadway ( 6) Temperature sensors (13) are respectively arranged inside, and wind pressure sensors (14) are respectively arranged at the air inlet adjustable damper (5) and the return air adjustable damper (11); The junction of the transition roadway (15) and the return air shaft (9) is provided with a groove (17), and the groove (17) is fixed on the inner wall of the return air shaft (9), and is connected with the corresponding transition roadway (15). ) are coaxially arranged, the ratio of the diameter of the groove (17) to the diameter of the transition roadway (15) is 2:1, and the ratio of the depth of the groove (17) to the diameter is 2:3. 2. The mine ventilation system according to claim 1, characterized in that: a deflector (16) is provided at the junction of the air supply tunnel (3) and the air supply shaft (1), and the deflector (16) It is fixed on the edge of the air supply tunnel (3), and the axial angle between the deflector (16) and the air supply tunnel (3) is 10° to 25°. 3. A control method of the mine ventilation system according to any one of claims 1-2, characterized in that it comprises the following steps: A. Determine the total air supply volume Q ₁ of the main air supply fan (2) according to the air supply wind speed requirements of each roadway, Among them, S _j is the average air supply area of the air supply tunnel, v _j is the wind speed setting value of the air supply tunnel, k ₁ is the correction coefficient, F ₁ is the average potential function of the air supply fluid, L ₁ is the flow of the air supply fluid the total length of B. According to the total air supply volume Q ₁ determined in step A, determine the total return air volume Q ₂ of the main return air fan (10), Among them, k2 is the correction coefficient, and μ is the average dynamic viscosity coefficient in the return air pipeline _; C, the air supply volume Q _1j of the auxiliary air blower fan (4) satisfies, The return air volume Q _2j of the auxiliary return air fan (8) satisfies, and, Among them, k ₃ is a proportional coefficient, 1<k ₃ <1.05, and k ₃ in all roadways is the same; D. Adjust the opening of the air intake adjustable damper (5) according to the deviation data between the detection value and the set value of the wind pressure and temperature in each air supply tunnel (3), Among them, ΔA _1j is the opening adjustment amount of the adjustable air door (5), ΔP _1j is the deviation data between the wind pressure detection value and the set value in the air supply tunnel (3), T _1j is the temperature detection value, k ₄ , k ₅ is the proportional coefficient; E. Adjust the return air adjustable damper (11) according to the opening adjustment amount of the air inlet adjustable damper (5) in the corresponding air supply tunnel (3) and the wind pressure in the return air tunnel (6), Among them, ΔA _2j is the opening adjustment amount of the return air adjustable damper (11), ΔP _2j is the deviation data between the wind pressure detection value and the set value in the return air tunnel (6), and k ₆ and k ₇ are proportional coefficients . 4. the control method of mine ventilation system according to claim 3 is characterized in that: the total return air volume Q of main return air blower fan ( ₁₀ ) according to the air inlet adjustable damper (5) and return air adjustable damper (11 ) opening adjustment for feedback correction, Wherein, Q ' ₂ is the total return air volume of the main return air fan (10) after correction, Adjust the weighted average for the openings of all the air intake adjustable dampers (5), The weighted average is adjusted for the openings of all return air adjustable dampers (11), the weighted rate is proportional to the ventilation flow of the corresponding roadway, and k ₈ and k ₉ are proportional coefficients.