A ventilation system for underground tunnel pumped storage space

Abstract

A ventilation system for an underground tunnel pumped storage space includes a working shaft and a ventilation shaft that directly lead to the underground tunnel space. The working shaft and the ventilation shaft are interconnected, forming an inlet and outlet for the air to circulate in the underground tunnel. The underground space is divided into a water-filled space and a non-water-filled space by a waterproof gate wall. Both spaces are connected to the main ventilation channel formed by the working shaft and the ventilation shaft. In order to meet the different ventilation needs of the two separated underground spaces, the present invention proposes a ventilation system that meets the needs of the underground water-filled space and the non-water-filled space. The present invention sets different ventilation processes based on the layout differences and functions of the underground tunnel space to meet the ventilation and air exchange needs of each stage of operation and shutdown and maintenance, realize the physical isolation of the dangerous gas accumulation space and the equipment operation space, ensure the safety of the equipment and personnel areas, greatly reduce the explosion-proof performance requirements of the area for the equipment, reduce the one-time investment cost, and at the same time reduce the space for forced ventilation and reduce energy consumption during operation.

Description

Technical Field

[0001] The present invention belongs to the field of ventilation technology, and in particular relates to a ventilation system that utilizes an underground tunnel as a pumped water storage space. Background Art

[0002] Using underground tunnels as pumped storage is a method of pumped storage. Underground tunnels are often complex and feature significant elevation differences. When used as equipment layout areas and underground water reservoirs, these tunnels contain both refillable and non-refillable spaces. Refillable areas are typically mining working and transport surfaces, which are relatively large and contain hazardous gases like methane, placing high demands on equipment explosion-proof performance. Different ventilation systems are required for these two spaces to achieve safety, efficiency, and cost-effectiveness. Summary of the Invention

[0003] The technical problem to be solved by the invention is: how to meet the ventilation needs of underground spaces using underground tunnels as pumped storage spaces, and provide a ventilation system for water-filled spaces and non-water-filled spaces in underground tunnels.

[0004] The technical solution of the present invention is specifically as follows:

[0005] A ventilation system for an underground tunnel pumped storage space includes a working shaft and a ventilation shaft directly connected to the underground tunnel space. The working shaft and ventilation shaft are interconnected, with two outlets to the atmosphere forming a main inlet and outlet passage for air circulation. The underground tunnel is divided into a water-filled space and a non-water-filled space depending on whether it is filled with water during operation. The two spaces are sealed and separated by a first waterproof gate wall and a second waterproof gate wall. The present invention provides a system that meets the ventilation needs of both the water-filled and non-water-filled spaces of an underground tunnel.

[0006] A low-level water storage tunnel serving as a low-level buffer reservoir is provided in the non-water-filled space. The low-level water storage tunnel is located at the bottom of the working well, and the altitude of the low-level water storage tunnel is lower than the equipment pipeline area of ​​the non-water-filled space.

[0007] The highest point of the water storage tunnel shall be at least as high as the non-water-filled space.

[0008] The first waterproof gate wall is connected to the first maintenance local ventilation fan, and the second waterproof gate wall is connected to the second maintenance local ventilation fan. A damper is installed on the air outlet side of the fan, which is connected to the water-filled space through a sealed pipe passing through the waterproof gate wall, and the air intake side is directly connected to the non-water-filled space.

[0009] Manholes are provided on both the first waterproof gate wall and the second waterproof gate wall.

[0010] A head and a bypass pipe are set at the top of the ventilation shaft, and an exhaust fan is installed on the bypass pipe.

[0011] An air balance pipe is led out from the highest air space in the water storage tunnel, laid along the tunnel, passed through the first waterproof gate wall, and then laid along the ventilation shaft to above the ground to directly connect to the atmospheric space.

[0012] The beneficial effects of the present invention are: different ventilation processes are set according to the layout differences and functions of the underground tunnel space to meet the ventilation and air exchange needs in various stages of operation and shutdown maintenance, realize the physical isolation of the dangerous gas accumulation space and the equipment operation space, ensure the safety of the equipment and personnel areas, greatly reduce the regional explosion-proof performance requirements for the equipment, reduce the one-time investment cost, and at the same time reduce the space for forced ventilation and reduce energy consumption during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 This is a state structure diagram of the present invention when it is shut down for maintenance. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0017] like Figure 1 As shown, a ventilation system for an underground tunnel pumped storage space includes a working shaft 2 and a ventilation shaft 1 that are directly connected to the underground tunnel. The working shaft 2 and the ventilation shaft 1 are interconnected, forming an inlet and outlet for the air to circulate in the underground tunnel. The underground space is divided into a water-filled space 12 and a non-water-filled space 3. Both spaces are connected to the main ventilation channel formed by the working shaft 2 and the ventilation shaft 1. However, two waterproof gate walls are set between the water-filled space 12 and the main ventilation channel to prevent water in the water-filled space from flowing into the non-water-filled space. The first waterproof gate wall 7 and the second waterproof gate wall 8 separate the underground ventilation tunnel into a non-water-filled space ventilation system and a water-filled space ventilation system. The water-filled space is a gas-containing space, and the non-water-filled space is a gas-free space.

[0018] Furthermore, the non-water-filled space 3 is an equipment installation and operation space, which contains a low-level water storage tunnel 5 used as a low-level buffer reservoir. The low-level water storage tunnel 5 is located at the bottom of the entire underground tunnel. The altitude of the low-level water storage tunnel 5 is lower than the equipment pipeline area of ​​the non-water-filled space 3. The water-filled space only serves as a buffer reservoir.

[0019] Furthermore, the highest point of the water storage tunnel 4 serving as the main storage for pumped storage is not lower than the non-water-filled space 3 .

[0020] Furthermore, a first maintenance local ventilator 9 is connected to the first waterproof gate wall 7, and a second maintenance local ventilator 10 is connected to the second waterproof gate wall 8. During construction, dampers are installed on the outlet side of the fans. These are sealed through pipes that pass through the corresponding waterproof gate wall and connect to the water-filled space. The intake side is directly connected to the non-water-filled space. This provides forced ventilation of the water storage tunnel 4 during shutdowns for drainage, dredging, and maintenance. Furthermore, manholes are provided on both the first and second waterproof gate walls 7, 8, which can be partially opened during shutdowns for maintenance and dredging.

[0021] Furthermore, a head and a bypass pipe are provided at the top of the ventilation shaft 1, and an exhaust fan 11 is installed on the bypass pipe. A damper is installed on the air outlet side of the fan, which is connected to the water-filled space through a sealed pipe passing through the waterproof gate wall, and the air intake side is directly connected to the non-water-filled space.

[0022] Furthermore, a gas balance pipe 6 is drawn from the highest air space in the water storage tunnel 4, laid along the tunnel, passed through the first waterproof gate wall 7, and then laid along the ventilation shaft 1 to the ground surface to directly connect to the atmospheric space. During the water storage and drainage phases, the gas in the water storage tunnel 4 is discharged into the atmosphere or sucked in through the gas balance pipe 6, achieving natural ventilation and water drainage and storage.

[0023] In this way, the ventilation system of the non-water-filled space is: working shaft 2, non-water-filled space 3, ventilation shaft 1, exhaust fan 11, thereby meeting the forced ventilation needs of normal operation of the non-water-filled space.

[0024] The ventilation system during the operation of the water-filled space is: the first waterproof gate wall 7, the second waterproof gate wall 8, the water storage tunnel 4, and the air balance pipe 6, so as to meet the natural ventilation needs of the water-filled space for normal operation.

[0025] The ventilation system during the maintenance of the water-filled space is: working well 2, non-water-filled space 3, first maintenance local ventilation fan 9, second maintenance local ventilation fan 10, first waterproof gate wall 7, second waterproof gate wall 8, water storage tunnel 4, and air balance pipe 6 to meet the forced ventilation needs during the maintenance of the water-filled space.

[0026] The working principle of the present invention is:

[0027] A ventilation system for an underground tunnel pumped storage space, wherein the non-water-filled space ventilation system comprises a working shaft 2, a non-water-filled space 3, a ventilation shaft 1, and an exhaust fan 11. The ventilation system utilizes the working shaft to intake air and the exhaust fan 11 on the upper part of the ventilation shaft to force exhaust.

[0028] The low-level water storage tunnel 5 is directly connected to the non-water-filled space 3 , and its ventilation system follows the ventilation system of the non-water-filled space 3 .

[0029] As attached Figure 1 As shown, the normal operation ventilation system of the water-filled space consists of: a first waterproof gate wall 7, a second waterproof gate wall 8, a water storage tunnel 4, and an air balance pipe 6. When the water storage tunnel 4 is filled with water, the water squeezes the air and exhausts it directly to the atmosphere through the air balance pipe 6. When the water storage tunnel 4 is drained, air enters the tunnel directly through the air balance pipe 6, achieving natural ventilation of the water storage tunnel during operation.

[0030] As attached Figure 2 As shown, the ventilation system for shutdown and maintenance of the water-filled space consists of a working shaft 2, an exhaust fan 11, a non-water-filled space 3, a first maintenance local ventilator 9, a second maintenance local ventilator 10, a first waterproof gate wall 7, a second waterproof gate wall 8, a water storage tunnel 4, and an air balance pipe 6. During the shutdown and maintenance and desilting period, the ventilation system of the water storage tunnel 4 first maintains the normal operation of the forced ventilation of the non-water-filled space, drains the remaining water in the water storage tunnel 4 to the low-level water storage tunnel 5 for storage or pumps it to the surface water storage space, shuts down the non-explosion-proof equipment in the non-water-filled space 3, starts the first maintenance local ventilator 9 and the second maintenance local ventilator 10, detects the concentration of dangerous gases such as methane in the water storage tunnel 4, and when the conditions for personnel entry are met, opens the sealed manhole doors on the first waterproof gate wall 7 and the second waterproof gate wall 8, and allows personnel to enter and carry out desilting operations. At this time, the ventilation of the water storage tunnel 4 is mainly supplied by the first maintenance local ventilator 9 and the second maintenance local ventilator 10 at the connection between the first waterproof gate wall 7, the second waterproof gate wall 8 and the non-water-filled space. The air enters from the non-water-filled space to maintain the ventilation in the water storage tunnel 4 at a slightly positive pressure state. The wind discharged into the water storage tunnel 4 is discharged to the atmosphere from the air balance pipe 6, forming a forced ventilation passage during maintenance. After the silt is basically cleared and unobstructed, the personnel are evacuated, the manhole sealing doors of the first waterproof gate wall 7 and the second waterproof gate wall 8 are closed, and the first maintenance local ventilator 9 and the second maintenance local ventilator 10 are shut down to achieve physical isolation between the non-water-filled space and the water-filled space. The forced ventilation system of the non-water-filled space remains in operation, and other systems wait for start-up instructions.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the scope of protection of the present invention.

Claims

1. A ventilation system for an underground tunnel pumped storage space, characterized by: An underground tunnel is used as the underground space of a pumped storage power station, and the underground space is divided into a water-filled space and a non-water-filled space; the underground non-water-filled space realizes air circulation through a working well (2) and a ventilation well (1); the underground water-filled space (12) includes a water-storage tunnel (4) and a waterproof gate wall, and a first waterproof gate wall (7) and a second waterproof gate wall (8) are respectively provided at the boundary between the water-storage tunnel (4) and the non-water-filled space, and the waterproof gate walls separate the underground tunnel ventilation system into a non-water-filled space ventilation system and a water-filled space ventilation system; A low-level water storage laneway (5) serving as a low-level buffer reservoir is provided in the non-water-filled space (3). The low-level water storage laneway (5) is located at the bottom of the working well (2). The altitude of the low-level water storage laneway (5) is lower than the equipment pipeline area of ​​the non-water-filled space (3). The first waterproof gate wall (7) is connected to a first maintenance local ventilator (9), and the second waterproof gate wall (8) is connected to a second maintenance local ventilator (10); a damper is installed on the air outlet side of the fan, which is connected to the water-filled space through a pipeline seal passing through the waterproof gate wall, and the air intake side is directly connected to the non-water-filled space; An air balance pipe (6) is drawn from the highest air space of the water storage tunnel (4), laid along the tunnel, passed through the first waterproof gate wall (7), and then laid along the ventilation shaft (1) to the ground and directly connected to the air space.

2. The ventilation system for underground tunnel pumped storage space according to claim 1, characterized in that: The highest point of the water storage tunnel (4) is not lower than the non-water-filled space (3).

3. The ventilation system for underground tunnel pumped storage space according to claim 1, characterized in that: Manholes are provided on both the first waterproof gate wall (7) and the second waterproof gate wall (8).

4. The ventilation system for underground tunnel pumped storage space according to claim 1, characterized in that: A head and a bypass pipe are provided at the top of the ventilation shaft (1), and an exhaust fan (11) is installed on the bypass pipe.

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