Energy-saving combined air supply system in mine

Abstract

The utility model provides a kind of energy-saving underground combined air supply system, it is related to mining technical field, mainly for solving the problem of large energy consumption, large wind energy loss in prior art air supply system. The underground combined air supply system includes multiple air compressor units arranged according to ore mouth, each air compressor unit is composed of multiple industrial frequency air compressors and at least one frequency conversion air compressor;Main ventilation duct is provided in ore mouth, near-end ventilation pipeline, far-end ventilation pipeline and valve are connected on main ventilation duct;Bridge duct is provided between each main ventilation duct, each air compressor unit realizes air supply or combined air supply by bridge duct. The underground combined air supply system can automatically adjust air supply according to actual ventilation demand, and reduces the consumption of electric energy under the condition of ensuring ventilation safety. The underground combined air supply system realizes air supply or combined air supply by bridge duct, and reduces wind energy loss under the condition of ensuring total air supply.

Description

Technical Field

[0001] This utility model is specifically an energy-saving underground combined ventilation system, which relates to the field of mining technology. Background Technology

[0002] To ensure safety in mining operations, ventilation systems are essential for underground operations. However, these systems are also major energy consumers in mining companies, with most having a total installed capacity of over 1000 kW for their ventilation systems (primarily air compressor units). Currently, ventilation systems consist of air compressor units, ventilation ducts, and valves. The air compressor units are composed of multiple screw air compressors connected together. Existing ventilation systems suffer from the following problems:

[0003] 1. The ventilation volume fluctuates depending on the needs of mining production. If all air compressors are turned on, it may result in a waste of electricity; if some air compressors are turned off, it may result in insufficient air supply.

[0004] 2. Currently, there are usually multiple mine outlets in the mining area, but the air compressor units are all set up in a centralized manner, which cannot supply air nearby. There is a significant loss of wind energy during long-distance air supply.

[0005] 3. The air supply valve needs to be opened manually, which is not conducive to energy saving and safety. Utility Model Content

[0006] To overcome the shortcomings of the prior art, this utility model discloses an energy-saving downhole combined air supply system, which adopts the following technical solution:

[0007] An energy-saving underground combined air supply system includes multiple air compressor units distributed at the mine entrance. Each air compressor unit consists of multiple industrial frequency air compressors and at least one variable frequency air compressor. A main ventilation duct is installed inside the mine entrance, and a near-end ventilation duct, a far-end ventilation duct, and valves are connected to the main ventilation duct. Bridging ducts are installed between the main ventilation ducts, and each air compressor unit can achieve local air supply or combined air supply through the bridging ducts.

[0008] Further improvements to the technical solution include a PLC connected to each air compressor unit. The PLC is mainly used to control the air output of the variable frequency air compressor.

[0009] Further improve the technical solution: Install a pressure transmitter at the end of each main ventilation duct. The pressure transmitter is used to measure the wind pressure at the end of the main ventilation duct and transmit the measurement data to the PLC.

[0010] Further improve the technical solution: Install flow meters at the outlets of the near-end ventilation duct and the far-end ventilation duct. The flow meters are used to measure the air supply volume and transmit the measurement data to the PLC.

[0011] Further improvement of the technical solution: The valves are electrically controlled valves, and the opening and closing of each electrically controlled valve is controlled by a PLC.

[0012] After implementing the above technical solution, the beneficial effects of this utility model compared to the prior art are:

[0013] The air compressor unit of this underground combined ventilation system consists of multiple industrial frequency air compressors and at least one variable frequency air compressor. It can automatically adjust the air supply volume according to the actual ventilation needs, reducing power consumption while ensuring ventilation safety.

[0014] The air compressor units of this underground combined ventilation system are distributed at the mine entrance, and the air supply is provided locally or jointly through bridging pipelines, which reduces wind energy loss while ensuring the total air supply volume. Attached Figure Description

[0015] Appendix Figure 1 The diagram shown is a structural schematic of the combined downhole ventilation system.

[0016] Appendix Figure 2 The attached image shows the attached image. Figure 1 A partial structural diagram.

[0017] Appendix Figure 3 The diagram shown illustrates the working principle of local air supply.

[0018] Appendix Figure 4 The diagram shown illustrates the working principle of the combined air supply system.

[0019] In the attached diagram: 1, 1 ＃ Mine entrance; 2, 1 ＃ Air compressor unit; 3.1 ＃ Main ventilation duct; 4.1 ＃ Near-end ventilation ducts; 5, 1 ＃ Remote ventilation ducts; 6, 2 ＃ Mine entrance; 7, 2 ＃ Air compressor unit; 8, 2 ＃ Main ventilation duct; 9, 2 ＃ Near-end ventilation ducts; 10, 2 ＃ 11. Remote ventilation ducts; 12. Bridging ducts; 13. Main pipeline electrically controlled valves; 14. Branch pipeline electrically controlled valves; 15. Pressure transmitters; 16. Working face. Detailed Implementation

[0020] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of this utility model and are not intended to limit the scope of protection of this utility model. It should be noted that in the description of this utility model, terms such as "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation and positional relationship, and therefore should not be construed as a limitation of this utility model. It should also be noted that in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] An energy-saving underground combined ventilation system, relating to the field of mining technology, is mainly used to solve the problems of high energy consumption and large wind energy loss in existing ventilation systems. The composition and working principle of this utility model are described in detail below.

[0022] See attached document Figure 1 and attached Figure 2 This underground combined ventilation system includes multiple air compressor units distributed at the mine entrance. Each air compressor unit consists of multiple fixed-frequency air compressors and at least one variable-frequency air compressor. A main ventilation duct is installed inside the mine entrance, and near-end ventilation ducts, far-end ventilation ducts, and valves are connected to the main ventilation duct. Bridging pipes 11 are installed between the main ventilation ducts, and each air compressor unit can achieve local or combined air supply through the bridging pipes 11.

[0023] In this embodiment, there is 1 in the mining area. ＃ Mine 1 and 2 ＃ Mine entrance 6, 1 ＃ Mine 1 and 2 ＃ Mine entrance 6 is offset along the east-west direction. (In 1) ＃ Outside of mine entrance 1, there is 1 ＃ Air compressor unit 2, 1 ＃ Air compressor unit 2 consists of two industrial frequency air compressors and two variable frequency air compressors. In unit 2... ＃ Two are set up outside of mine outlet 6. ＃ Air compressor unit 7, 2 ＃Air compressor unit 7 consists of two fixed-frequency air compressors and one variable-frequency air compressor. The fixed-frequency air compressors ensure a minimum air supply downhole, while the variable-frequency air compressor adjusts the total air supply according to actual usage to meet floating air supply requirements. To facilitate control of the total air supply, at 1... ＃ Air compressor unit 2 and 2 ＃ A PLC is installed between the air compressor units 7. The PLC is mainly used to control the speed of the variable frequency air compressor, thereby controlling the air output of the variable frequency air compressor and the air supply of the entire air compressor unit.

[0024] In 1 ＃ One is set up inside the mine entrance 1 ＃ Main ventilation duct 3, in 1 ＃ The main ventilation duct 3 is connected to a 1-channel system for supplying air to each working face. ＃ Near-end ventilation ducts 4 and 1 ＃ Remote ventilation duct 5. In 1 ＃ Two main duct electrically controlled valves K1 and K2 are installed on the main ventilation duct 3. ＃ Near-end ventilation ducts 4 and 1 ＃ The remote ventilation duct 5 is equipped with branch pipe electrically controlled valves 13. The opening and closing of the main pipe electrically controlled valve 12 and the branch pipe electrically controlled valves 13 are controlled by PLC. Under most circumstances, the branch pipe electrically controlled valves 13 are closed and are only opened during construction.

[0025] Similarly, in 2 ＃ There are 2 inside the mine entrance 6 ＃ Main ventilation duct 8, in 2 ＃ The main ventilation duct 8 is connected to 2 [unclear - possibly referring to a specific type of ventilation duct] for supplying air to each working face. ＃ Near-end ventilation ducts 9 and 2 ＃ Remote ventilation duct 10. In 2 ＃ Two main duct electrically controlled valves, K3 and K4, are installed on the main ventilation duct 8. ＃ Near-end ventilation ducts 9 and 2 ＃ The remote ventilation duct 10 is equipped with branch pipe electrically controlled valves 13, and the opening and closing of the main pipe electrically controlled valve 12 and the branch pipe electrically controlled valves 13 are controlled by PLC.

[0026] Usually 1 ＃ The tunnels at mine entrance 1 and 2 ＃ The tunnels at mine entrance 6 are not interconnected, but 1 ＃ The remote ventilation duct 5 is often close to 2. ＃ Mine entrance 6, and 2 ＃ The remote ventilation duct 10 is often close to 1 ＃ Mine entrance 1, therefore it is necessary to excavate a roadway at a suitable location, and connect it to the main pipeline via bridging pipe 11 and main pipeline electrically controlled valve K5. ＃Main ventilation ducts 3 and 2 ＃ The main ventilation ducts 8 are connected to enable local or combined air supply to the work area 15.

[0027] To ensure the air pressure of the supplied air, at 1 ＃ Main ventilation ducts 3 and 2 ＃ A pressure transmitter 14 is installed at the end of the main ventilation duct 8. The pressure transmitter 14 is used to measure pressure 1. ＃ Main ventilation ducts 3 and 2 ＃ The system measures the air pressure at the end of the main ventilation duct 8 and transmits the measurement data to the PLC. If the air pressure is lower than the set value,

[0028] To ensure air supply volume, flow meters (not shown in the figure) are installed at the outlets of the near-end and far-end ventilation ducts. The flow meters are used to measure the air supply volume and transmit the measurement data to the PLC.

[0029] See attached document Figure 3 If 2 ＃ 10 to 2 remote ventilation ducts ＃ The distance to air compressor unit 7 is greater than that to 1 ＃ If the distance to air compressor unit 2 is such that the main pipeline electrically controlled valves K1, K5, and K4 are opened, while the main pipeline electrically controlled valve K3 is closed, so that 1 ＃ 2-way air compressor unit ＃ The remote ventilation duct 10 supplies air locally, thereby reducing wind energy loss during the air supply process. Because 1 ＃ Air compressor units 2 and 2 ＃ The air compressor unit 7 can automatically adjust the air volume according to the actual ventilation needs, thus reducing the consumption of electricity while ensuring ventilation safety.

[0030] See attached document Figure 4 If 1 ＃ When air compressor unit 2 is running at full power, 1 ＃ If the air supply volume of the remote ventilation duct 5 still does not meet the requirements, then open the main duct's electrically controlled valve K5 to allow 2 ＃ Air compressor unit 7 also to 1 ＃ The remote ventilation duct 5 supplies air, making full use of the capacity of the two air compressor units to provide joint air supply to each work area 15.

[0031] It is worth noting that the content not described in detail in the above embodiments is prior art. It is also worth noting that any additions, subtractions, substitutions, and improvements made by those skilled in the art based on the structure and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy-saving downhole combined ventilation system, characterized in that: It includes multiple air compressor units distributed at the mine entrance, each air compressor unit consisting of multiple industrial frequency air compressors and at least one variable frequency air compressor; a main ventilation duct is installed inside the mine entrance, and near-end ventilation duct, far-end ventilation duct and valve are connected to the main ventilation duct; bridging ducts are installed between each main ventilation duct, and each air compressor unit can achieve local air supply or joint air supply through the bridging ducts.

2. The energy-saving downhole combined ventilation system as described in claim 1, characterized in that: It also includes a PLC connected to each air compressor unit. The PLC is mainly used to control the air output of the variable frequency air compressor.

3. The energy-saving downhole combined ventilation system as described in claim 2, characterized in that: Pressure transmitters are installed at the end of each main ventilation duct. The pressure transmitters are used to measure the air pressure at the end of the main ventilation duct and transmit the measurement data to the PLC.

4. The energy-saving downhole combined ventilation system as described in claim 2, characterized in that: Flow meters are installed at the outlets of the near-end and far-end ventilation ducts. The flow meters are used to measure the air volume and transmit the measurement data to the PLC.

5. The energy-saving downhole combined ventilation system as described in claim 1, characterized in that: The valves are electrically controlled valves, and the opening and closing of each electrically controlled valve is controlled by a PLC.

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