Sectional air pressure type maintenance door of compressed air energy storage power station underground cavern and setting method

Abstract

The application relates to a compressed air energy storage power station underground cavern section air pressure type maintenance door and a setting method. The cavern is composed of outer surrounding rock, middle layer concrete lining and inner sealing layer. The maintenance door is arranged on the side wall of the cavern. At least one pressure-adjustable air chamber is arranged on the outside of the maintenance door. Through the scheme, the load acting on the maintenance door can be basically transmitted to the surrounding rock according to the stress transmission mode of the remaining part of the gas storage cavern, so that the problem of the incoordination between the maintenance door and the surrounding deformation of the cavern in the single maintenance door scheme is reduced, and the sealing property and stability of the cavern are ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mine maintenance door, and particularly relates to a compressed air energy storage power station underground mine chamber segmented air pressure type maintenance door and a setting method. BACKGROUND

[0002] With the continuous increase of the proportion of new energy and the gradual perfection of the electricity trading market, compressed air energy storage technology has ushered in greater development opportunities.

[0003] Compressed air energy storage technology is a large-scale and long-time energy storage and power generation technology. Its technical principle is as follows: in the wind curtailment, light curtailment and low valley electricity stage, the electric energy is used to drive the compressor to compress air, which is sent to the underground gas storage for storage; when the electricity peak period comes, the high-pressure air in the gas storage is heated through the heat exchanger or combustion chamber and is sent to the expander to expand and do work, driving the generator to generate electricity, thereby realizing the peak load shifting function of energy.

[0004] The compressed air underground gas storage is currently mainly a salt cavern gas storage. It is formed by injecting fresh water into a relatively thick salt layer or salt dome by using water solution mining method, dissolving the salt rock layer, and then discharging the saturated or near-saturated brine, thereby forming a salt cavern in the underground. The salt cavern gas storage has the advantages of good sealing and high stability. However, the salt cavern gas storage is obviously limited by geographical environment. The areas where the compressed air energy storage power station needs to be constructed may have no salt rock distribution, and thus the underground gas storage cannot be constructed.

[0005] In addition to the salt cavern gas storage, in recent years, the underground artificial mine chamber is also an important choice for the compressed air energy storage power station. It is a gas storage structure with a certain volume formed by artificial excavation in the underground hard rock. According to the shape of the gas storage, the underground artificial mine chamber can be divided into two forms of large tank type and tunnel type. Figure 4

[0006] No matter what form the underground artificial mine chamber is, the chamber wall structure is mainly composed of a sealing layer, a concrete lining and surrounding rock from the inside to the outside, as shown in Figure 3 The gas tightness of this form of gas storage is provided by the sealing material, such as steel, and the stability and deformation of the mine chamber are provided by the concrete lining.

[0007] The advantage of the artificial mine chamber mainly lies in the strong controllability of the project, which can be flexibly arranged according to the construction needs. The underground artificial mine chamber is the key research and demonstration direction of the compressed air energy storage engineering project at the present stage. Therefore, from the perspective of the gas storage method, the future compressed air energy storage power station will mainly use the artificial mine chamber, and other gas storage methods will be supplemented.

[0008] ​The compressed air energy storage power station has been verified by the construction of experimental power stations of 5 kW to 1.5 MW, and the current projects basically reach the level of 60 MW to 100 MW, and the 300 MW level project is also in the process of planning and design. The working pressure variation range of the gas storage of these projects is generally several megapascals, and the basic pressure in the gas storage is also generally several megapascals, and even as high as more than ten megapascals. The basic pressure is the constant pressure of the gas storage during normal operation.

[0009] In order to overhaul or regular inspection, personnel, equipment and materials need to enter the gas storage. Therefore, an overhaul door needs to be arranged on the sidewall of the gas storage. Before entering the gas storage, the gas storage needs to be emptied, and the pressure in the gas storage is reduced to atmospheric pressure. The size of the overhaul door needs to meet the requirements of equipment and material entering and leaving the gas storage, and the size of the overhaul door is large; at the same time, the high internal pressure of more than ten megapascals needs to be borne by the overhaul door during normal operation of the gas storage.

[0010] If a single overhaul door scheme is adopted, only by increasing the steel degree of the overhaul door, the deformation of the door body can meet the design requirements, the thickness of the overhaul door is large, the operation is difficult, and the huge load applied by the internal gas pressure is transmitted to the door frame, and the load is transmitted to the surrounding rock by the door frame. In this case, the surrounding rock near the overhaul door bears the load in a different way from the rest of the part, and the deformation characteristics are different, it is difficult to ensure the deformation coordination of the overhaul door, the surrounding sealing layer, the lining and the surrounding rock, and it is difficult to ensure the sealing property and long-term stability of the overhaul door. Therefore, the design of the overhaul door is difficult, and it is a key problem to be solved in the project. SUMMARY

[0011] The present application provides a kind of compressed air energy storage power station underground chamber segmented air pressure type overhaul door and setting method, by being arranged several pressure adjustable air chamber in the first layer overhaul door outside of chamber sidewall, the pressure generated by chamber is transmitted to surrounding rock, can reduce the incoordination problem of deformation of overhaul door and surrounding chamber, to ensure the sealing property and stability of chamber.

[0012] The technical means adopted by the present application is as follows:

[0013] A kind of compressed air energy storage power station underground chamber segmented air pressure type overhaul door, the chamber is composed of outer surrounding rock, intermediate layer concrete lining and inner sealing layer, the overhaul door is arranged on the sidewall of the chamber, and at least one pressure adjustable air chamber is arranged outside the overhaul door.

[0014] As preferred, there is an overhaul passage outside the overhaul door, at least one adjusting door is arranged in the overhaul passage, and at least one air chamber surrounded by the adjusting door, the overhaul passage and the overhaul door is formed.

[0015] As preferred, the first adjusting door, the second adjusting door and the third adjusting door are sequentially and spacedly arranged in the maintenance passage in the direction away from the maintenance door, and the first air chamber, the second air chamber and the third air chamber are formed on the side of the three adjusting doors close to the maintenance door.

[0016] As preferred, the inner wall of the maintenance passage is surrounded by the concrete lining, and a sealing layer is further arranged between the air chamber and the concrete lining, and a clamping groove is arranged on the concrete lining at the position corresponding to the adjusting door, and the adjusting door is fixedly arranged through the clamping groove.

[0017] As preferred, a throttle valve is arranged on the adjusting door, and an air pressure sensor is arranged in the air chamber.

[0018] A setting method of the segmented air pressure type maintenance door of the compressed air energy storage power station underground cavern, comprising the following steps:

[0019] S1: arranging the maintenance door on the cavern side wall;

[0020] S2: determining the number of adjusting doors: under the condition of corresponding cavern type and size, the decay curve of cavern wall normal stress with cavern wall distance is calculated according to the elastic foundation theory, and the number n of adjusting doors is determined according to the maximum pressure of the cavern to be stored and the design pressure bearing capacity of the adjusting door and the maintenance door.

[0021] S3: determining the position of the adjusting door: n nodes are arranged along the longitudinal axis of the cavern wall normal stress from the highest point of the decay curve obtained in S3, and the position of each node corresponding to the horizontal coordinate of the cavern wall distance is the position of each adjusting door.

[0022] S4: according to the number and position of the adjusting door determined in S2 and S3, the adjusting door is arranged in the maintenance passage reserved outside the maintenance door, and a corresponding number of pressure-adjustable air chambers are formed on the side of each adjusting door close to the maintenance door.

[0023] Compared with the prior art, the beneficial technical effects of the present application are as follows:

[0024] The present application can transmit the pressure generated by the gas storage cavern to the surrounding rock by arranging the segmented pressure-adjustable air chambers behind the maintenance door, avoiding the problem of poor sealing and stability caused by deformation around the maintenance door of the cavern due to too much pressure. And each air chamber of the present application is provided with a pressure sensor and a throttle valve, which can real-time control the pressure of each air chamber when the pressure in the cavern decreases or the maintenance door needs to be opened, realizing the set pressure ratio between each air chamber. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the maintenance door of the present application.

[0026] Figure 2This is a schematic diagram of the method for determining the pressure of each air chamber and the position of each regulating valve in this invention.

[0027] Figure 3 This is a schematic diagram of the structure of the tunnel.

[0028] Figure 4 The diagram shows the structure of a large tank-type gas storage facility (a) and a tunnel-type gas storage facility (b).

[0029] in:

[0030] 1. Duct, 11. Sealing layer, 12. Concrete lining, 13. Surrounding rock, 14. Access tunnel; 2. Inspection door; 3. Regulating door, 31. First regulating door, 32. Second regulating door, 33. Third regulating door; 4. Air chamber, 41. First air chamber, 42. Second air chamber, 43. Third air chamber; 5. Slot; 6. Maintenance passage. Detailed Implementation

[0031] This invention provides a sectional pneumatic inspection door for an underground chamber of a compressed air energy storage power station. This inspection door 2 meets the following functional requirements: (1) it can be repeatedly closed when needed; (2) its size meets the requirements for personnel, equipment, and materials to enter and exit the air chamber; (3) it can withstand internal pressure of 10-20 MPa or even higher; (4) the inspection door 2 meets stability requirements under high internal pressure, ensuring the safe operation of the air chamber; (5) the inspection door 2 has minimal deformation under high internal pressure, its deformation is coordinated with that of other parts of the chamber, and it must not leak air. Specifically, such as... Figure 1 As shown, the chamber 1 refers to an artificial chamber, which consists of an outer layer of surrounding rock 13, an intermediate layer of concrete lining 12, and an inner sealing layer 11. The inspection door 2 is set on the side wall of the chamber 1. At least one pressure-adjustable air chamber 4 is set on the outside of the inspection door 2. The air chamber 4 provides a reaction force to balance the normal stress generated by the internal pressure of the chamber 1. The load acting on the inspection door 2 is basically transmitted to the surrounding rock 13 according to the stress transmission mode of the rest of the gas storage chamber 1. This reduces the problem of incoordination between the inspection door 2 and the surrounding deformation of the chamber 1 in the single inspection door 2 scheme, thereby ensuring the sealing and stability of the chamber 1.

[0032] Furthermore, such as Figure 1As shown, the maintenance passage 6 outside the maintenance door 2 is provided with at least one adjusting door 3, and forms at least one air chamber 4 surrounded by the adjusting door 3, the maintenance passage 6 and the maintenance door 2. The inner wall of the maintenance passage 6 is surrounded by the concrete lining 12, and a sealing layer 11 is further arranged between the air chamber 4 and the concrete lining 12, and a clamping groove 5 is arranged on the concrete lining 12 corresponding to the position of the adjusting door 3, and the adjusting door 3 is fixedly arranged through the clamping groove 5. In practice, the maintenance passage 6 is generally transformed from a construction tunnel, and in order to meet the construction requirements, the diameter of the construction tunnel is generally large, and when the construction tunnel is reconstructed into the maintenance passage 6, the hole diameter needs to be reduced, and the diameter of the reconstructed maintenance passage 6 needs to meet the requirements of people, equipment and materials entering and exiting the chamber 1. Specifically, as provided in the scheme, the surrounding rock 13 of the original construction tunnel is paved with the concrete lining 12 inward, and the sealing layer 11 is arranged between each air chamber 4 and the outer peripheral concrete lining 12, so that each air chamber 4 and the structure of the chamber 1 are consistent, and the good sealing property of each air chamber 4 is ensured.

[0033] In one specific embodiment, as Figure 1 In the maintenance passage 6, the first adjusting door 31, the second adjusting door 32 and the third adjusting door 33 are sequentially and spacedly arranged in the direction away from the maintenance door 2, and the first air chamber 41, the second air chamber 42 and the third air chamber 43 are formed on the side of the three adjusting doors 3 close to the maintenance door 2.

[0034] In addition, the adjusting door 3 is provided with a throttle valve for controlling the air pressure in the air chamber 4, and the air pressure sensor is arranged in the air chamber 4 for detecting the air pressure in the air chamber 4. Preferably, the throttle valve and the air pressure sensor are arranged in each air chamber 4, and the throttle valve and the air pressure sensor are not shown in the figure, and their number and position can be set according to the conventional method meeting the functional requirements of the throttle valve and the air pressure sensor.

[0035] A setting method of the maintenance door of the compressed air energy storage power station underground chamber, comprising the following steps:

[0036] S1: arranging the maintenance door 2 on the side wall of the chamber 1;

[0037] S2: determining the number of adjusting doors 3: under the conditions of corresponding chamber 1 type and size, such as Figure 2 As shown, the decay curve of the normal stress of the chamber wall of the chamber 1 with the distance of the chamber wall is calculated according to the elastic foundation theory, and the number n of the adjusting doors 3 is further determined according to the maximum pressure to be stored in the chamber 1 and the design pressure bearing capacity of the adjusting door 3 and the maintenance door 2;

[0038] S3: Determine the position of regulating gate 3: Based on the highest point of the attenuation curve obtained in S3, set n nodes downward along the longitudinal axis of the tunnel wall normal stress. The position of each node corresponding to the distance from the tunnel wall on the horizontal axis is the position of each regulating gate 3; where n is the number of regulating gates 3 determined in S2.

[0039] S4: Based on the number and position of the regulating gates 3 determined in S2 and S3, the regulating gates 3 are set in the maintenance passage 6 reserved outside the maintenance gate 2, and a corresponding number of pressure-adjustable air chambers 4 are formed on the side of each regulating gate 3 near the maintenance gate 2.

[0040] In such Figure 2 In the embodiment shown, the number of maintenance doors 2 is actually determined to be 3 according to step S2. In the attenuation curve, 3 nodes are set at equal intervals on the vertical axis of the highest point chamber 1 with internal pressure σ0 downward. The normal stress of the chamber wall on the vertical axis is set at equal intervals in 4 segments. The position of each node on the horizontal coordinate d1 to d3 is the position of each regulating door 3. As can be seen from the figure, since the normal stress attenuation curve is a concave curve, the distance between the regulating doors 3 is getting larger and larger.

[0041] In this mode, the ratio of the air pressure in each air chamber 4 to the pressure σ0 in the chamber 1 is a constant, such as... Figure 2 As shown, the air pressure in the first chamber 41 is (3 / 4σ0), the air pressure in the second chamber 42 is (2 / 4σ0), and the air pressure in the third chamber 43 is (1 / 4σ0). During actual operation, the air pressure sensor in each chamber 4 can obtain the actual air pressure in each chamber 4. Based on its magnitude, the throttle valve is opened or closed to adjust the air pressure in each chamber 4 to the set pressure, thereby achieving self-balancing.

[0042] Since the last regulating valve 3 is also equipped with a throttle valve, when the pressure in the gas storage chamber 1 decreases, or when it is necessary to open the maintenance door 2, the pressure in each gas chamber 4 can be reduced by adjusting this throttle valve, so as to achieve the set pressure ratio between each gas chamber 4.

[0043] This method allows the load acting on the inspection door 2 to be transferred to the surrounding rock 13 in a manner similar to the stress transfer pattern of the other parts of the gas storage chamber 1. This reduces the incoordination between the inspection door 2 and the surrounding deformation of the chamber 1 in the single inspection door 2 scheme, thereby ensuring the sealing and stability of the chamber 1.

[0044] In the solution proposed in this patent, all inspection doors 2 have the same form and pressure-bearing capacity, which facilitates design and construction installation. The doors are connected in series, which can better ensure the gas storage safety of the chamber 1.

Claims

1. A sectional pneumatic inspection door for an underground chamber of a compressed air energy storage power station, wherein the chamber (1) is composed of an outer layer of surrounding rock (13), a middle layer of concrete lining (12), and an inner sealing layer (11), characterized in that, The inspection door (2) is located on the side wall of the chamber (1), and at least one pressure-adjustable air chamber (4) is located on the outside of the inspection door (2). There is an inspection passage (6) on the outside of the inspection door (2), and at least one regulating door (3) is provided in the inspection passage (6), forming at least one air chamber (4) surrounded by the regulating door (3), the inspection passage (6) and the inspection door (2); In the maintenance passage (6), three regulating doors (3) are arranged in sequence at intervals along the direction away from the maintenance door (2): first regulating door (31), second regulating door (32), and third regulating door (33). On the side of the three regulating doors (3) closest to the maintenance door (2), three air chambers (4) are formed respectively: first air chamber (41), second air chamber (42), and third air chamber (43).

2. The sectional pneumatic inspection door for the underground chamber of the compressed air energy storage power station according to claim 1, characterized in that, The inner wall of the maintenance passage (6) is surrounded by a concrete lining (12), and a sealing layer (11) is provided between the air chamber (4) and the concrete lining (12), and a slot (5) is provided on the concrete lining (12) at the corresponding position of the regulating door (3), and the regulating door (3) is fixedly installed through the slot (5).

3. The sectional pneumatic inspection door for the underground chamber of the compressed air energy storage power station according to claim 2, characterized in that, A throttle valve is installed on the regulating valve (3), and a pressure sensor is installed in the air chamber (4).

4. A method for installing sectional pneumatic inspection doors in an underground chamber of a compressed air energy storage power station, characterized in that, Includes the following steps: S1: Install an inspection door (2) on the side wall of the chamber (1); S2: Determine the number of regulating gates (3): Under the conditions of the type and size of the corresponding chamber (1), calculate the attenuation curve of the normal stress of the chamber wall of the chamber (1) with the distance of the chamber wall according to the elastic foundation theory. Further determine the number of regulating gates (3) n based on the maximum pressure of the chamber (1) to be stored and the design pressure bearing capacity of the regulating gate (3) and the maintenance gate (2). S3: Determine the position of the regulating gate (3): Based on the highest point of the attenuation curve obtained in S2, set n nodes downward along the longitudinal axis of the tunnel wall normal stress. The position of each node corresponding to the distance of the tunnel wall on the horizontal axis is the position of each regulating gate (3). S4: Based on the number and position of the regulating gates (3) determined in S2 and S3, the regulating gates (3) are set in the maintenance passage (6) reserved outside the maintenance gate (2), and a corresponding number of pressure-adjustable air chambers (4) are formed on the side of each regulating gate (3) near the maintenance gate (2).

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