A method for ventilation regulation of multiple midsections and multiple regions in an underground mine

Abstract

The present invention discloses a method for ventilation regulation in multiple intermediate levels and multiple regions underground. The intermediate level where the first stoping in the upper part of the production intermediate level is completed is set as the air collecting intermediate level. The production intermediate level is divided into independent ventilation regions. A ventilation air shaft is arranged at the center of the corresponding ventilation regions of the upper and lower production intermediate levels. Fresh air flows from the air intake shaft through the upper panel haulage roadway, lower panel haulage roadway and crosscut in the intermediate level into the air demand place of each independent ventilation region. The polluted air washing the working face enters the air collecting intermediate level through the connection roadway and the ventilation air shaft, and then is discharged to the surface through the return air shaft. During underground production, according to the operation production plan and the actual air demand, the air path and air volume are adjusted by adjusting the rotation speed of the main fan and the closing of the air door at the connection roadway, so as to realize ventilation on demand. The present invention has the advantages of high effective air volume rate, simple regulation and easy intelligent control, etc.

Description

Technical Field

[0001] The present invention belongs to the field of underground mine ventilation, and particularly relates to a ventilation control method for multiple mid - sections and multiple regions underground. Background Technique

[0002] The ventilation system is one of the eight major systems for underground mine exploitation. The basic tasks of the mine ventilation system are: (1) supplying sufficient fresh air underground to meet the oxygen needs of personnel; (2) diluting toxic and harmful gases and dust underground to ensure safe production; (3) regulating the underground climate to create a good working environment.

[0003] The mine ventilation system consists of two parts: a ventilator and a ventilation network. After the air current enters the mine through the air intake shaft, it passes through various air - using places underground, and then enters the return air shaft and is discharged from the mine. The entire route that the air current passes through is called the mine ventilation system. Mine ventilation methods can be divided into two types according to the different power sources of the air current: natural ventilation and mechanical ventilation. (1) Natural ventilation: The ventilation method that uses the ventilation power generated by natural air pressure to cause air to flow in underground roadways is called natural ventilation. The natural air pressure is generally relatively small and unstable. (2) Mechanical ventilation: The ventilation method that uses the ventilation power generated by the operation of a fan to cause air to flow in underground roadways is called mechanical ventilation. In mines using mechanical ventilation, natural air pressure always exists and affects the ventilation work of the mine at all times. Full attention should be paid to it in ventilation management work, especially in high - methane mines.

[0004] The ventilation quality is related to the breathing safety of underground workers. A good ventilation system can greatly ensure the mining progress of the mine and improve the working efficiency. The mid - section ventilation control method is an important part of the ventilation system, which is related to aspects such as how the air current is distributed, whether fresh air and polluted air are in series, the magnitude of ventilation resistance, ventilation energy consumption, and ventilation effect. Especially in the case of multiple simultaneously - producing mid - sections and multiple production regions, good mid - section ventilation regulation is even more important. Conventional mid - section ventilation regulation methods include: the step method, the parallel double - lane method, the comb - like method, etc. These methods have higher requirements for the production system and sequence, are not applicable to the situation of multiple mid - sections being mined simultaneously, and require higher ventilation energy consumption.

[0005] Therefore, how to ensure that the air current flows according to the design while taking into account the stoping, ensure the effective air volume rate, and reduce ventilation energy consumption is one of the technical problems that those skilled in the art are eager to solve. Summary of the Invention

[0006] To solve the above - mentioned technical problems, the present invention provides a ventilation control method for multiple mid - sections and multiple regions underground, adopting the following technical solutions:

[0007] Step 1: Construct the middle air-return section. Set the first mined-out middle section in the upper part of the production middle section as the middle air-return section. Build air doors at the connections between the middle air-return section and each upper middle section and the intake shaft for isolation, and build air walls at the connections between each production middle section and the return air shaft for isolation. The overall ventilation system adopts exhaust ventilation, and install a main fan on the return air side. When the depth of the middle air-return section from the ground surface is less than or equal to 400 m, install the main fan on the ground surface. When the depth of the middle air-return section from the ground surface is greater than 400 m, install the main fan at the connection between the middle air-return section and the return air shaft.

[0008] Step 2: Divide the production middle section into independent ventilation areas. Set a middle air-return raise in the center of the corresponding ventilation areas of the upper and lower production middle sections. The top of the middle air-return raise is connected to the middle air-return section. The middle air-return raise is connected to the middle sections and sublevels in the corresponding ventilation areas through connecting roadways, and install air doors at the connecting roadways. Fresh air flows from the intake shaft through the upper panel haulage roadway, lower panel haulage roadway and crosscut of the middle section into the air demand places of each independent ventilation area, and the polluted air washing the working face enters the middle air-return section through the connecting roadway and the middle air-return raise, and then is discharged to the ground surface through the return air shaft.

[0009] Step 3: During underground production, according to the operation production plan and the actual air demand, adjust the air path and air volume by adjusting the rotation speed of the main fan and the closing of the air doors at the connecting roadways to achieve ventilation according to demand.

[0010] Step 4: After the mining of each independent ventilation area in the production middle section is completed, promptly seal the connecting roadway connecting the area and the middle air-return raise to avoid waste of air volume. When the overall mining of the topmost production middle section is completed, lower the entire middle air-return section to this middle section, and seal the bottom of the middle air-return raise above this middle section. The newly added lower production middle section is also divided into independent ventilation areas corresponding to the upper production middle section, and construct a middle air-return raise from the independent ventilation area to connect with the corresponding middle air-return raise of the upper middle section.

[0011] Furthermore, in the middle air-return section, build air walls to seal the crosscuts that are not connected to the middle air-return raise to simplify the ventilation circuit and reduce the air resistance.

[0012] Furthermore, the independent ventilation areas of the middle section are divided along the ore body strike. The independent ventilation areas of the upper and lower production middle sections correspond to each other and have the same boundary positions, and are divided into an independent ventilation area every 100 m along the ore body strike.

[0013] Furthermore, the air doors installed at the connecting roadways where the middle air-return raise is connected to the middle sections and sublevels are automatic air doors.

[0014] Furthermore, when there are many large blasts in the independent ventilation area, select automatic air doors with pressure relief and shock absorption functions for the automatic air doors.

[0015] Furthermore, during underground production, according to the operation production plan, actual required air volume and actual situation, local fans, auxiliary fans and ventilation structures can be set in the upper panel haulage roadway, lower panel haulage roadway and crosscut to assist ventilation.

[0016] Beneficial effects

[0017] Compared with the existing technologies and methods, a method for regulating and controlling underground multi-level and multi-region ventilation provided by the present invention has the following beneficial effects:

[0018] (1) The ventilation structure is simple and easy to regulate, solving the problems of series connection of polluted air and fresh air, polluted air circulation, high ventilation energy consumption, low effective air volume rate, and difficult regulation faced in simultaneous mining of multiple panels and multiple levels.

[0019] (2) The ventilation system structure combines the advantages of parallel double roadway and comb-type intermediate-level ventilation networks, having the advantages of high effective air volume rate, simple regulation, and easy intelligent management and control. Brief description of the drawings

[0020] The present invention will be further described in detail below with reference to the drawings.

[0021] Figure 1 is a schematic diagram of a method for regulating and controlling underground multi-level and multi-region ventilation provided by the present invention;

[0022] In the figure: 1 - intake shaft; 2 - fresh air; 3 - air door; 4 - lower panel haulage roadway; 5 - upper panel haulage roadway; 6 - air collecting raise; 7 - connection roadway; 8 - air wall; 9 - return air shaft; 10 - polluted air; 11 - main fan; 12 - air collecting intermediate level; 13 - production intermediate level; 14 - crosscut. Specific embodiments

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0024] As Figure 1 shown, when using a method for regulating and controlling underground multi-level and multi-region ventilation provided by the present invention for underground ventilation regulation, the following steps are included:

[0025] Step 1. Construct the middle section of air return. Set the first mined-out middle section at the upper part of the production middle section as the middle section of air return 12. Build air doors 3 at the connection between the middle section of air return 12 and each upper middle section and the intake shaft 1 for isolation. Build air walls in the middle section of air return 12 to seal the cross-cuts that are not connected to the air return raise 6, so as to simplify the ventilation circuit and reduce the air resistance. Build air walls 8 at the connection between each production middle section 13 and the return shaft 9 for isolation. The overall ventilation system adopts exhaust ventilation. Install a main fan 11 on the return air side. When the depth of the middle section of air return 12 from the ground surface is less than or equal to 400 m, the main fan 11 is installed on the ground surface. When the depth of the middle section of air return 12 from the ground surface is greater than 400 m, the main fan 11 is installed at the connection between the middle section of air return 12 and the return shaft 9.

[0026] Step 2. Divide the production middle section 13 into independent ventilation areas. The independent ventilation areas of the middle section are divided along the ore body strike. The independent ventilation areas of the upper and lower production middle sections 13 correspond to each other and have the same boundary positions. Divide them into independent ventilation areas every 100 m along the ore body strike. Set an air return raise 6 in the center of the corresponding ventilation areas of the upper and lower production middle sections 13. The top of the air return raise 6 is connected to the middle section of air return 12. The air return raise 6 is connected to the middle sections and sublevels in the corresponding ventilation areas through connecting roadways 7. Install air doors 3 at the connecting roadways 7. The air doors 3 are automatic air doors 3. Preferably, when there are many large-scale blasts in the independent ventilation area, the automatic air doors 3 are selected as automatic air doors 3 with pressure relief and shock absorption functions. Fresh air 2 flows from the intake shaft through the upper panel haulage roadway, lower panel haulage roadway and cross-cut 14 of the middle section into the air-required places of each independent ventilation area. The polluted air 10 washing the working face enters the middle section of air return 12 through the connecting roadway 7 and the air return raise 6, and then is discharged to the ground surface through the return shaft 9.

[0027] Step 3. During underground production, according to the operation production plan and the actual air volume required, adjust the air circuit and air volume by adjusting the rotation speed of the main fan 11 and the closing of the air doors 3 at the connecting roadways 7 to achieve ventilation on demand. According to the actual situation, set local fans, auxiliary fans and ventilation structures in the upper panel haulage roadway 5, lower panel haulage roadway 4 and cross-cut 14 for auxiliary ventilation.

[0028] Step 4. After the mining of each independent ventilation area in the production middle section 13 is completed, promptly seal the connecting roadway 7 connecting the area and the air return raise 6 to avoid waste of air volume. When the overall mining of the uppermost production middle section 13 is completed, lower the entire middle section of air return 12 to this middle section, and seal the bottom of the air return raise 6 above this middle section. The newly added lower production middle section 13 is also divided into independent ventilation areas corresponding to the upper production middle section 13, and an air return raise 6 is constructed from the independent ventilation area to connect with the corresponding air return raise 6 of the upper middle section.

[0029] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention should cover within the protection scope of the present invention any equivalent replacement or change made according to the technical solution and inventive concept of the present invention.

Claims

1. A method for regulating and controlling underground multi - level and multi - area ventilation, characterized in that It includes the following steps: Step 1: Construct the middle air-return section. Set the first mined-out section in the upper part of the production middle section as the middle air-return section. Build air doors at the connections between the middle air-return section and each upper middle section and the intake shaft for isolation, and build air walls at the connections between each production middle section and the return air shaft for isolation. The overall ventilation system adopts exhaust ventilation, and install a main fan on the return air side. When the depth of the middle air-return section from the ground surface is less than or equal to 400m, the main fan is installed on the ground surface. When the depth of the middle air-return section from the ground surface is greater than 400m, the main fan is installed at the connection between the middle air-return section and the return air shaft. Step 2: Divide the production middle section into independent ventilation areas. Set a middle air-return raise in the center of the corresponding ventilation areas of the upper and lower production middle sections. The top of the middle air-return raise is connected to the middle air-return section. The middle air-return raise is connected to the middle sections and sublevels in the corresponding ventilation areas through connecting roadways, and air doors are installed at the connecting roadways. Fresh air flows from the intake shaft through the upper panel haulage roadway, lower panel haulage roadway and cross-cut in the middle section into the air-required places of each independent ventilation area, and the polluted air washing the working face enters the middle air-return section through the connecting roadway and the middle air-return raise, and then is discharged to the ground surface through the return air shaft. Step 3: During underground production, according to the operation production plan and the actual required air volume, adjust the rotation speed of the main fan and the closing of the air doors at the connecting roadways to regulate the air path and air volume, so as to achieve ventilation on demand. Step 4: After the mining of each independent ventilation area in the production middle section is completed, promptly seal the connecting roadway connecting the area and the middle air-return raise to avoid waste of air volume. When the overall mining of the uppermost production middle section is completed, immediately lower the entire middle air-return section to this section, and seal the bottom of the middle air-return raise above this section. The newly added lower production middle section is also divided into independent ventilation areas corresponding to the upper production middle section, and a middle air-return raise is constructed from the independent ventilation area to connect with the corresponding middle air-return raise in the upper middle section.

2. The method for regulating and controlling underground multi-level and multi-region ventilation according to claim 1, wherein: In the middle air-return section, build an air wall to seal the cross-cuts that are not connected to the middle air-return raise, so as to simplify the ventilation circuit and reduce the air resistance.

3. A method for regulating and controlling underground multi-level and multi-region ventilation according to claim 1, characterized in that: The independent ventilation areas of the middle sections are divided along the ore body strike. The independent ventilation areas of the upper and lower production middle sections correspond to each other and have the same boundary positions, and are divided into an independent ventilation area every 100m along the ore body strike.

4. A method for underground multi-level and multi-region ventilation regulation according to claim 1, characterized in that: The air doors installed at the connecting roadways where the middle air-return raise is connected to the middle sections and sublevels are automatic air doors.

5. A method for underground multi-level and multi-region ventilation regulation according to claim 4, characterized in that: When there are many large blasts in the independent ventilation area, the automatic air doors select automatic air doors with pressure relief and shock absorption functions.

6. A method for regulating and controlling underground multi-level and multi-region ventilation according to claim 1, characterized in that: During underground production, according to the operation production plan, actual required air volume and actual situation, local fans, auxiliary fans and ventilation structures can be set in the upper panel haulage roadway, lower panel haulage roadway and cross-cut to assist ventilation.

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