Sectional mechanical 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 sectional mechanical maintenance door and a setting method. The cavern is composed of outer surrounding rock, intermediate layer concrete lining and inner sealing layer. The maintenance door is arranged on the side wall of the cavern. A king post is arranged on the side of the maintenance door. The outer periphery of the king post is connected with the surrounding rock through a plurality of supports which can be disconnected. The king post is divided into a main king post directly connected with the maintenance door, a first secondary king post connected with the other end of the main king post and a second secondary king post connected with the other end of the first secondary king post. Through the counterforce unit composed of the secondary king posts and the supports, the pressure generated in the cavern can be transferred to the surrounding rock connected with the secondary king posts, so that the incoordination problem of the deformation of the maintenance door and the surrounding cavern 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 segmented mechanical maintenance door of an underground mine of a compressed air energy storage power station 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, the compressed air energy storage technology has ushered in greater development opportunities.

[0003] The 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 a compressor to compress air, and the air is sent to an underground gas storage for storage; when the electricity peak period comes, the high-pressure air in the gas storage is heated through a heat exchanger or a combustion chamber, and is sent to an expander to expand and do work, thereby driving a generator to generate electricity, so as to realize the function of peak load shifting.

[0004] The underground compressed air storage 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 a water solution mining method, dissolving the salt rock layer, and then discharging the saturated or near-saturated brine, so as to form 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 the geographical environment. The area 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 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 can be divided into two forms of large tank type and tunnel type. Figure 4

[0006] No matter what form the underground artificial mine is, the mine 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 are provided by the concrete lining.

[0007] The advantage of the artificial mine mainly lies in the strong controllability of the project, which can be flexibly arranged according to the construction demand. The underground artificial mine 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 mode, the future compressed air energy storage power station will mainly use the artificial mine, and other gas storage modes will be supplemented.

[0008] ​The compressed air energy storage power station has been verified by the construction of experimental power stations with a power of 5 kW to 1.5 MW. At present, the projects in production basically reach the level of 60 MW to 100 MW, and the projects in the planning and design process have reached the level of 300 MW. The working pressure of the gas storage library of these projects generally varies by several megapascals, and the basic pressure in the gas storage library is also generally several megapascals, and even as high as ten megapascals or more. The basic pressure is the constant pressure during the normal operation of the gas storage library.

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

[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. However, 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 that the deformation of the overhaul door, the surrounding sealing layer, the lining and the surrounding rock is coordinated, 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 that needs to be solved in the project. SUMMARY

[0011] The present application provides a kind of compressed air energy storage power station underground cavern segmented mechanical overhaul door and setting method, by in overhaul door after segmented rock-embedded counterforce self-balancing system, the pressure generated by gas storage library is transmitted to surrounding rock, can reduce the uncoordinated problem of the deformation of the overhaul door and the surrounding cavern, to ensure the sealing property and stability of the cavern.

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

[0013] A kind of compressed air energy storage power station underground cavern segmented mechanical overhaul door, the cavern is composed of outer surrounding rock, intermediate layer concrete lining and inner sealing layer, the overhaul door is arranged on the sidewall of the cavern, a king post is arranged on the side of the overhaul door, and the king post is connected with the surrounding rock around the king post through several supportable supports.

[0014] As preferred, the overhaul door is arranged on the inner sidewall of the inner sealing layer, the outer side of the overhaul door is a maintenance passage, the opening direction of the overhaul door is towards the inner side of the cavern, and the king post is arranged on the outer side of the outer side of the overhaul door towards the outer side of the cavern.

[0015] As preferred, the roof column comprises a main roof column fixedly arranged on the access door, and at least one secondary roof column arranged at the end of the main roof column away from the access door, the support between the roof column and the surrounding rock comprises a first support and a second support; wherein the periphery of the main roof column is provided with a plurality of first supports, the other end of the first support is fixedly arranged on the access door, the periphery of the secondary roof column is provided with a plurality of second supports, the other end of the second support is rotatably arranged on the surrounding rock of the periphery of the secondary roof column, and the second support is disconnectably connected with the secondary roof column.

[0016] As preferred, the inner side of the surrounding rock close to the secondary roof column is provided with a concrete lining, a clamping groove is arranged in the concrete lining at the position, a glue joint ring is arranged on the side of the clamping groove close to the secondary roof column, and the second support is rotatably arranged on the glue joint ring, wherein the glue joint ring is located on the side of the support point of the second support on the secondary roof column away from the access door.

[0017] As preferred, the secondary roof column is provided with 4 pairs or 8 pairs of second supports which are symmetrical to each other, and the positions and number of the glue joint rings correspond to the positions and number of the second supports.

[0018] As preferred, an axial force sensor is further arranged on the secondary roof column between the second support and the main roof column, and a telescopic axial force adjusting section is further arranged on the secondary roof column between the axial force sensor and the second support.

[0019] As preferred, a suspension cable is further arranged on the corresponding concrete lining of the top of the secondary roof column, and the suspension cable is connected with the secondary roof column of the bottom.

[0020] As preferred, the secondary roof column is provided with two, including a first secondary roof column which is disconnectably connected with the main roof column, and a second secondary roof column which is disconnectably connected with the other end of the first secondary roof column.

[0021] And, a setting method of a segmented mechanical access door of an underground cavern of a compressed air energy storage power station is provided, comprising the following steps:

[0022] S1: arranging an access door on the side wall of the cavern, and arranging a main roof column on the outer side of the access door;

[0023] S2: assembling a counterforce unit at the other end of the main roof column: including a secondary roof column which is disconnectably connected with the other end of the main roof column, a support which is disconnectably connected with the secondary roof column and the concrete lining of the periphery of the secondary roof column, and an axial force sensor and an axial force adjusting section arranged on the secondary roof column;

[0024] S3: determining the number of counterforce units: according to the maximum pressure of the cavern to be stored and the design pressure bearing capacity of each counterforce unit, the number n of counterforce units is determined;

[0025] S4: determining the position of the counterforce unit: under the condition of corresponding cavern type and size, the decay curve of cavern wall normal stress with distance is calculated according to the elastic foundation theory, n nodes are set along the longitudinal axis of the cavern wall from the highest point of the decay curve, each node corresponds to the position of the adhesive ring in the corresponding counterforce unit, and the position of the corresponding counterforce unit is determined;

[0026] S5: determining the extension amount of the axial force adjusting section in the counterforce unit: according to the decay curve and the position of the adhesive ring of each counterforce unit determined in S4, the normal stress at the corresponding position is obtained, the normal stress is further multiplied by the net area of the manhole to obtain the axial force required to be reached by each counterforce unit, and then the extension amount of the axial force adjusting section is adjusted through the automatic loading control system, so that the extension amount meets the requirement that the axial force sensor reaches the set value of the axial force required by the counterforce unit;

[0027] S6: according to the number, position and extension amount of the axial force adjusting section of the counterforce unit determined in S3-S5, each counterforce unit is sequentially connected and arranged at the end of the main roof column away from the manhole.

[0028] Compared with the prior art, the beneficial technical effects of the present application are as follows:

[0029] The present application sets up the counterforce unit composed of the segmented roof column and the corresponding components behind the manhole, and transmits the pressure generated by the gas storage to the surrounding rock, thereby avoiding the problem that the deformation around the manhole of the gas storage due to too much pressure causes poor sealing and stability. Moreover, the axial force sensor and the axial force adjusting section are arranged on each roof column, which can adjust the load borne by each segment of the counterforce unit in real time, so that the load borne is consistent, which is convenient for design and construction. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the manhole of the present application.

[0031] Figure 2 It is a normal stress schematic diagram of each segment of the counterforce unit of the manhole.

[0032] Figure 3 It is a structural schematic diagram of the cavern.

[0033] Figure 4 It is a structural schematic diagram of the large tank type gas storage (a) and the tunnel type gas storage (b).

[0034] Among them:

[0035] 1. Duct, 11. Sealing layer, 12. Concrete lining, 13. Surrounding rock, 14. Access tunnel; 2. Inspection door; 3. Roofing column, 31. Main roofing column, 32. Secondary roofing column, 321. First roofing column, 322. Second roofing column; 4. Support, 41. First support, 42. Second support; 5. Slot; 6. Adhesive ring; 7. Axial force sensor; 8. Axial force adjustment section; 9. Maintenance space. Detailed Implementation

[0036] This invention provides a sectional mechanical maintenance door for an underground chamber of a compressed air energy storage power station. The maintenance door 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 maintenance door meets the stability requirements under high internal pressure to ensure the safe operation of the air chamber; (5) the maintenance door has small deformation under high internal pressure, and its deformation is coordinated with that of other parts of the chamber, and it must not leak air. Specifically, the chamber 1 is an artificial chamber, consisting of an outer layer of surrounding rock 13, an intermediate layer of concrete lining 12, and an inner layer of sealing layer 11. The maintenance door 2 is set on the side wall of the chamber 1. A top column 3 is set on the side of the maintenance door 2. The periphery of the top column 3 is connected to the surrounding rock 13 outside the top column 3 by several supports 4 that can be repeatedly disconnected and connected.

[0037] Preferred, such as Figure 1 As shown, the inspection door 2 is located on the inner wall of the inner sealing layer 11, and the outer side of the inspection door 2 is an inspection passage. Considering that the inspection door 2 only bears the large internal pressure, the opening direction of the inspection door 2 is towards the inside of the chamber 1. Considering the deformation and stability of the inspection door 2 under high internal pressure, the shape of the inspection door is preferably circular.

[0038] Furthermore, considering that the size of the inspection door 2 significantly impacts the difficulty of project implementation, a larger inspection door 2 facilitates the entry and exit of personnel, equipment, and materials from the gas storage facility. However, increasing the size of the inspection door 2 will increase the load-bearing area and the open space behind the door, thus increasing the implementation difficulty. Taking an inspection door 2 with a diameter of 2m as an example, under an internal pressure of 10MPa, the force reaches 3.14×104kN. Under such a large internal pressure, relying solely on the door frame to provide reaction force cannot guarantee the deformation and stability requirements of the door body. Therefore, it is necessary to install a segmented rock-embedded reaction unit composed of components such as the top column 3 behind the inspection door 2 to transfer the pressure generated by the chamber 1 to the surrounding rock 13.

[0039] like Figure 1As shown in the figure, the roof column 3 is arranged on the outer side of the maintenance door 2 facing the outside of the chamber 1, the roof column 3 comprises a main roof column 31 fixedly arranged on the maintenance door 2, and at least one secondary roof column 32 arranged at the end of the main roof column 31 away from the maintenance door 2, the support 4 between the roof column 3 and the surrounding rock comprises a first support 41 and a second support 42; wherein the periphery of the main roof column 31 is provided with a plurality of first supports 41, the other end of the first support 41 is fixedly arranged on the maintenance door 2, and the first support 41 is umbrella-shaped. The periphery of the secondary roof column 32 is provided with a plurality of second supports 42, the other end of the second support 42 is rotatably arranged on the surrounding rock 13 at the periphery of the secondary roof column 32, and the second support 42 is disconnectable from the secondary roof column 32.

[0040] In addition, the maintenance space 9 behind the maintenance door 2 is generally formed by the construction tunnel, in order to meet the construction requirements, the diameter of the construction tunnel is generally large, and when the construction tunnel is rebuilt into the maintenance space, the hole diameter needs to be reduced, the inner side of the surrounding rock 13 close to the secondary roof column 32 is provided with a concrete lining 12, of course, when the hole diameter of the maintenance space itself meets the requirements, the clamping groove 5 can be directly arranged on the surrounding rock 13. The clamping groove 5 is arranged in the concrete lining 12 at the position, the side of the clamping groove 5 close to the secondary roof column 32 is provided with a cementing ring 6, and the second support 42 is rotatably arranged on the cementing ring 6, wherein the cementing ring 6 is located on the side of the support point of the second support 42 connected by the cementing ring 6 on the secondary roof column 32 away from the maintenance door 2.

[0041] In addition, the secondary roof column 32 is provided with 4 pairs or 8 pairs of second supports 42 which are symmetrical to each other, and the positions and quantities of the cementing rings 6 correspond to the positions and quantities of the second supports 42. The top of the secondary roof column 32 is further provided with a suspension cable (not shown in the figure) on the corresponding concrete lining 12, and the suspension cable is connected with the bottom secondary roof column 32.

[0042] In actual implementation, when the maintenance door 2 needs to be opened, the support 4 is separated from the secondary roof column 32, the support 4 is rotated along the cementing ring 6 to the concrete lining at the periphery of the secondary roof column 32, then the secondary roof column is detached from the main roof column 31, the secondary roof column 32 is suspended to the top or placed at the bottom through the suspension cable, and then the maintenance door 2 is opened.

[0043] In addition, as shown in Figure 1 the secondary roof column 32 between the second support 42 and the main roof column 31 is further provided with an axial force sensor 7 for displaying the axial force provided by the counter-force unit composed of each section of the secondary roof column 32, and the secondary roof column 32 between the axial force sensor 7 and the second support 42 is further provided with an extendable axial force adjusting section 8, which can be controlled by an automatic loading control system to adjust the extension amount of the loading and unloading axial force adjusting section 8, control the axial force provided by each counter-force unit, and make the axial force sensor 7 reach the required set value, so as to realize self-balancing.

[0044] As Figure 1 and Figure 2 In the embodiment shown in the figure, the secondary roof column 32 is provided with two, including the first secondary roof column 321 which is detachably connected with the main roof column 31, and the second secondary roof column 322 which is detachably connected with the other end of the first secondary roof column 321. That is, including the first secondary roof column 321 and the corresponding components which are connected in sequence and gradually away from the main roof column 31, and the second secondary roof column 322 and the corresponding components which are connected in sequence and gradually away from the first secondary roof column 321, the two counterforce units jointly bear the pressure generated by the chamber 1. The two counterforce units are preferably consistent in load size, which is convenient for design and construction.

[0045] Further, a setting method of the underground chamber sectional mechanical maintenance door of the compressed air energy storage power station is provided, comprising the following steps:

[0046] S1: A maintenance door 2 is arranged on the side wall of the chamber 1, and a main roof column 31 is arranged on the outer side of the maintenance door 2.

[0047] S2: A counterforce unit is assembled at the other end of the main roof column 31, including a secondary roof column 32 which is detachably connected with the other end of the main roof column 31, a support which detachably connects the secondary roof column 32 and the peripheral concrete lining 12 of the secondary roof column 32, and an axial force sensor 7 and an axial force adjusting section 8 arranged on the secondary roof column 32.

[0048] S3: Determine the number of counterforce units: according to the maximum pressure of the chamber 1 to be stored and the design pressure bearing capacity of each counterforce unit, determine the number n of counterforce units.

[0049] S4: Determine the position of the counterforce unit: according to the elastic foundation theory, calculate the decay curve of the chamber wall normal stress with the chamber wall distance under the condition of the type and size of the corresponding chamber 1, set n nodes along the longitudinal axis of the chamber wall from the highest point of the decay curve, and each node corresponds to the position of the corresponding counterforce unit, that is, the position of the corresponding counterforce unit is determined; of course, according to the elastic theory calculation, the decay curve of the chamber wall normal stress with the distance from the chamber wall can be obtained under different internal pressure conditions of the chamber 1, as shown in Figure 2 The decay curve of the chamber wall normal stress with the distance from the chamber wall in the embodiment shown in the figure is a concave curve, so the distance between the glue joints 6 becomes larger and larger. This design method is consistent in load size for each force unit, which is convenient for design and construction.

[0050] S5: Determine the extension amount of the axial force adjusting section 8 in the counterforce unit: According to the attenuation curve determined in S4 and the position of each counterforce unit cement ring 6, the normal stress at the corresponding position is obtained, and the normal stress is further multiplied by the net area of the access door 2 to obtain the axial force that each counterforce unit needs to reach, and then further through the automatic loading control system, the extension amount of the axial force adjusting section 8 is adjusted, so that the extension amount meets the requirement that the axial force sensor 7 reaches the set value of the axial force required by the counterforce unit; wherein the net area of the access door 2 is the door area minus the door frame area.

[0051] S6: According to the number, position and extension amount of the axial force adjusting section 8 of the counterforce unit determined in S3-S5, each counterforce unit is sequentially connected and arranged at the end of the main roof column 31 away from the access door 2.

[0052] By using this method, the load acting on the access door 2 can be transmitted to the surrounding rock 13 basically according to the stress transmission mode of the rest of the gas storage, the filling state of the rock mass behind the access door 2 of the cavern 1 can be accurately simulated, and the problem of incoordination between the access door 2 and the surrounding cavern 1 can be reduced, thereby ensuring the sealing and stability of the cavern 1.

Claims

1. A sectional mechanical maintenance 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 cave (1). A top column (3) is provided on the side of the inspection door (2). The outer perimeter of the top column (3) is disconnected from the surrounding rock (13) of the top column (3) by several supports (4). The inspection door (2) is located on the inner wall of the inner sealing layer (11). The outer side of the inspection door (2) is an inspection passage. The opening direction of the inspection door (2) is towards the inside of the chamber (1). The top column (3) is located on the outer side of the inspection door (2) facing the outside of the chamber (1). The top column (3) includes a main top column (31) fixedly installed on the inspection door (2) and at least one secondary top column (32) detachably installed at one end of the main top column (31) away from the inspection door (2). The support (4) between the top column (3) and the surrounding rock (13) includes a first support (41) and a second support (42). Several first supports (41) are provided on the periphery of the main top column (31), and the other end of the first support (41) is fixedly installed on the inspection door (2). Several second supports (42) are provided on the periphery of the secondary top column (32), and the other end of the second support (42) is rotatably installed on the surrounding rock (13) on the periphery of the secondary top column (32). The second support (42) and the secondary top column (32) can be disconnected.

2. The sectional mechanical maintenance door for the underground chamber of the compressed air energy storage power station according to claim 1, characterized in that, A concrete lining (12) is provided on the inner side of the surrounding rock (13) near the secondary top column (32). A slot (5) is provided in the concrete lining (12) at this location. A glued ring (6) is provided on the side of the slot (5) near the secondary top column (32). The second support (42) is rotatably mounted on the glued ring (6). The glued ring (6) is located on the side away from the inspection door (2) of the support point of the second support (42) connected to the glued ring (6) on the secondary top column (32).

3. The sectional mechanical maintenance door for the underground chamber of the compressed air energy storage power station according to claim 2, characterized in that, The secondary top column (32) is provided with 4 or 8 pairs of symmetrical second supports (42), and the position and number of adhesive rings (6) correspond to the position and number of the second supports (42).

4. The sectional mechanical maintenance door for the underground chamber of the compressed air energy storage power station according to claim 3, characterized in that, An axial force sensor (7) is also provided on the secondary top column (32) between the second support (42) and the main top column (31), and a retractable axial force adjustment section (8) is also provided on the secondary top column (32) between the axial force sensor (7) and the second support (42).

5. The sectional mechanical maintenance door for the underground chamber of the compressed air energy storage power station according to claim 4, characterized in that, A suspension cable is also provided on the concrete lining (12) corresponding to the top of the secondary top column (32), which is connected to the secondary top column (32) at the bottom.

6. The sectional mechanical maintenance door for the underground chamber of the compressed air energy storage power station according to claim 5, characterized in that, There are two secondary top columns (32), including a first top column (321) that is detachably connected to the main top column (31), and a second top column (322) that is detachably connected to the other end of the first top column (321).

7. A method for installing sectional mechanical maintenance doors in an underground chamber of a compressed air energy storage power station, characterized in that, Includes the following steps: S1: An inspection door (2) is installed on the side wall of the chamber (1), and a main top column (31) is installed on the outer side of the inspection door (2). S2: Assemble a reaction unit at the other end of the main top column (31): including a secondary top column (32) that can be disconnected from the other end of the main top column (31), a support (4) that can be disconnected from the secondary top column (32) and the concrete lining (12) around the secondary top column (32), and an axial force sensor (7) and an axial force adjustment section (8) installed on the secondary top column (32). S3: Determine the number of reaction units: Based on the maximum pressure of the gas to be stored in the chamber (1) and the design pressure bearing capacity of each reaction unit, determine the number of reaction units n; S4: Determine the position of the reaction unit: Under the conditions of the type and size of the corresponding cave (1), calculate the decay curve of the normal stress of the cave wall with the distance of the cave wall according to the elastic foundation theory. Set n nodes along the longitudinal axis of the cave wall normal stress from the highest point of the decay curve downward. The distance of the cave wall on the horizontal axis of each node corresponds to the position of the adhesive ring (6) in the corresponding reaction unit, and then determine the position of the corresponding reaction unit. S5: Determine the expansion and contraction of the axial force adjustment section (8) in the reaction unit: Based on the attenuation curve determined in S4 and the position of the adhesive ring (6) of each reaction unit, obtain the normal stress at the corresponding position. Further multiply the normal stress by the net area of ​​the inspection door (2) to obtain the axial force required by each reaction unit. Then, through the automatic loading control system, adjust the expansion and contraction of the axial force adjustment section (8) so that the expansion and contraction meets the axial force sensor (7) to reach the axial force setting value required by the reaction unit. S6: According to the number, position and expansion / contraction of the reaction force unit and the axial force adjustment section (8) determined in S3-S5, connect each reaction force unit in sequence to the end of the main top column (31) away from the inspection door (2).

Images