Fluid flow battery underground reservoir surrounding rock oil pressure-bearing erosion system

Abstract

The utility model discloses a surrounding rock oil pressure-bearing erosion system for a flow battery underground storage cavern. The surrounding rock oil pressure-bearing erosion system comprises a pressure-bearing reaction system, a pressure applying and releasing system and a conversion regulation and control system, the pressure-bearing reaction system comprises a pressure-bearing reaction kettle, a base, a mesh cylinder, a sealing cover and a pressure gauge; the pressure applying and releasing system comprises a cylinder body, a piston, a piston rod, a cylinder plug, a grip and a supporting seat; the conversion regulation and control system comprises a regulation and control chamber, a pressure-resistant hose, a pressure increasing and relieving regulation and control valve, a liquid injection observation container and an oil liquid regulation and control valve; and a liquid channel for communicating the inner cavity of the pressure-bearing reaction kettle with the pressure-resistant hose is arranged on the sealing cover. By adopting the flow battery underground reservoir surrounding rock oil pressure-bearing erosion system disclosed by the utility model, a pressure-bearing erosion experiment can be carried out on a rock test piece under the working condition of required pressure, so that researchers can be helped to obtain the process and result of erosion of the reservoir surrounding rock by an oil storage medium under the working condition pressure through the experiment.

Description

Technical Field

[0001] The utility model relates to the technical field of underground storage rock mass erosion experiments, and particularly relates to an underground storage rock mass erosion experiment system. Background Art

[0002] Flow batteries are widely used in large-scale energy storage due to their characteristics of fast charge and discharge, large storage scale, and high safety performance. Currently, the storage methods of electrolytes mainly include various forms such as using large storage tanks, decentralized storage, solid-state storage, mobile storage containers, and underground storage. Among them, large storage tanks are commonly used but have high costs and large floor areas. In addition, during the long-distance transportation of electrolytes, there are risks of leakage, fire, and explosion. Once an accident occurs, it may cause serious pollution to the surrounding environment and incalculable property losses. Although solid-state storage and mobile storage containers reduce some risks, energy loss may occur during the process of converting from solid state to liquid state, affecting the overall efficiency of the energy storage system. Underground storage not only has a large storage capacity and high safety, but also has smaller temperature and pressure fluctuations in the underground space compared to large storage tanks, and the storage conditions are relatively stable.

[0003] When underground salt caverns store oil storage media such as electrolytes and petroleum for a long time, the surrounding rock mass of the storage is under the combined action of pore pressure and in-situ stress generated by the storage medium, and coupled with the chemical erosion and deterioration effect of the storage medium, it will affect the pore structure inside the surrounding rock mass, thereby affecting the permeability of the cavity. Therefore, obtaining the erosion process and results of the oil storage medium on the surrounding rock mass of the storage under working conditions is crucial for ensuring the tightness and stability of the storage. Content of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a liquid flow battery underground storage rock mass oil pressure-bearing erosion system to help solve the technical problem of obtaining the erosion process and results of the oil storage medium on the surrounding rock mass of the storage under working conditions through experiments.

[0005] The liquid flow battery underground storage rock mass oil pressure-bearing erosion system of the utility model includes a pressure-bearing reaction system, a pressure addition and relief system, and a conversion and regulation system;

[0006] The pressure-bearing reaction system includes a pressure-bearing reaction kettle, a base arranged at the inner bottom of the pressure-bearing reaction kettle, a mesh cylinder placed on the base for fixing the rock mass specimen, a sealing cover connected to the pressure-bearing reaction kettle, and a pressure gauge arranged on the sealing cover for monitoring the pressure inside the pressure-bearing reaction kettle;

[0007] The pressure addition and relief system includes a cylinder body, a piston slidably and sealingly matched with the cylinder body, a piston rod connected to the piston, a cylinder plug fixed at the rear end of the cylinder body and threadedly connected to the piston rod, a grip connected to the end of the piston rod, and a support seat for fixing the cylinder body;

[0008] The conversion control system includes a control chamber connected to the front end of the cylinder block, a pressure-resistant hose connecting the control chamber and the sealing cover, a pressure addition and relief control valve provided on the pressure-resistant hose, a liquid injection observation container, and an oil liquid control valve connecting the control chamber and the liquid injection observation container. A liquid passage communicating the inner cavity of the pressure-bearing reaction kettle with the pressure-resistant hose is provided on the sealing cover.

[0009] Further, the piston is composed of a core rod and a plug body fixed on the core rod. The core rod is connected to the piston rod through an adapter sleeve, and the adapter sleeve is rotatably connected to the front end of the piston rod.

[0010] Further, an L-shaped diversion channel is provided on the base, and both ends of the L-shaped diversion channel penetrate the top surface and the side surface of the base respectively.

[0011] Further, the sealing cover and the pressure-bearing reaction kettle are connected by threads.

[0012] Advantages of the present utility model:

[0013] By adopting the oil liquid pressure-bearing erosion system for the surrounding rock of the underground reservoir of the flow battery of the present utility model, a pressure-bearing erosion experiment on rock specimens can be realized under the required pressure conditions, so that researchers can obtain the process and results of the erosion of the oil liquid storage medium on the surrounding rock of the reservoir under the working condition pressure through the experiment. Description of the drawings

[0014] Figure 1 It is a schematic structural diagram of the oil liquid pressure-bearing erosion system for the surrounding rock of the underground reservoir of the flow battery. Specific implementation manners

[0015] In this embodiment, the oil liquid pressure-bearing erosion system for the surrounding rock of the underground reservoir of the flow battery includes a pressure-bearing reaction system, a pressure addition and relief system, and a conversion control system.

[0016] The pressure-bearing reaction system includes a pressure-bearing reaction kettle 1, a base 2 provided at the inner bottom of the pressure-bearing reaction kettle, a mesh cylinder 3 placed on the base for fixing the rock mass specimen, a sealing cover 4 connected to the pressure-bearing reaction kettle, and a pressure gauge 5 provided on the sealing cover for monitoring the pressure inside the pressure-bearing reaction kettle.

[0017] The pressure addition and relief system includes a cylinder block 6, a piston 7 slidably and sealingly matched with the cylinder block, a piston rod 8 connected to the piston, a cylinder plug 9 fixed to the rear end of the cylinder block and threadedly connected to the piston rod, a grip 10 connected to the end of the piston rod, and a support base 11 for fixing the cylinder block;

[0018] The conversion control system includes a control chamber 12 connected to the front end of the cylinder block, a pressure-resistant hose 13 connecting the control chamber and the sealing cover, a pressure addition and relief control valve 14 provided on the pressure-resistant hose, a liquid injection observation container 15, and an oil liquid control valve 16 connecting the control chamber and the liquid injection observation container. A liquid passage 17 communicating the inner cavity of the pressure-bearing reaction kettle with the pressure-resistant hose is provided on the sealing cover.

[0019] The process of conducting an experiment using the oil liquid pressure-bearing erosion system for the surrounding rock of the flow battery underground storage is as follows:

[0020] First, wrap the side surface of the cylindrical rock specimen with a heat shrinkable tube, leaving the upper and lower end faces of the cylindrical rock specimen exposed. Then open the sealing cover 4 and place the cylindrical rock specimen into the mesh cylinder 3. Add the electrolyte of the flow battery into the pressure-bearing reaction kettle 1. With the pressure addition and relief control valve 14 and the oil liquid control valve 16 opened, observe whether the electrolyte flows back to the liquid injection observation container 15 during the process of closing the cover. After the cover is closed, if no electrolyte flows back to the liquid injection observation container 15, it may mean that the amount of electrolyte added to the pressure-bearing reaction kettle 1 is insufficient and there is still air in the pressure-bearing reaction kettle 1. At this time, first close the oil liquid control valve 16, and then drive the piston rod 8 to rotate reversely by rotating the grip 10. Since the piston rod 8 and the cylinder plug 9 are connected by threads, when the piston rod 8 rotates reversely, it will move backward, and then pull the piston 7 to move backward, thus sucking the air in the pressure-bearing reaction kettle 1 into the cylinder block 6. Then close the pressure addition and relief control valve 14, open the oil liquid control valve 16, and add electrolyte into the liquid injection observation container 15. The electrolyte enters the control chamber 12 and the cylinder block 6. Then close the oil liquid control valve 16 again, open the pressure addition and relief control valve 14, and rotate the piston rod 8 forward by rotating the grip 10. During the rotation of the piston rod 8, it moves forward, thereby pushing the piston 7 to move forward, and thus injecting the supplementary electrolyte into the pressure-bearing reaction kettle 1. Then continue to rotate the grip 10 forward and observe the pressure gauge 5. When the pressure value shown on the pressure gauge 5 is within the required range, close the pressure addition and relief control valve 14 to keep the pressure in the pressure-bearing reaction kettle 1 stable. At this time, the rock workpiece is in a state of being eroded by the electrolyte under the set pressure condition. After the experiment time is up, first open the oil liquid control valve 16, then slowly open the pressure addition and relief control valve 14 to relieve the pressure, and then open the sealing cover 4 to take out the rock specimen to observe the experimental results.

[0021] As an improvement to the above embodiment, the piston 7 is composed of a core rod 71 and a plug body 72 fixed on the core rod. The core rod is connected to the piston rod 8 through an adapter sleeve 18, and the adapter sleeve is rotatably connected to the front end of the piston rod. With this connection method between the piston and the piston rod, when the piston rod 8 makes a rotational motion, the piston 7 will only make a linear sliding motion in the cylinder block, and the piston 7 will not make a rotational motion, which can better ensure the sealing relationship between the piston 7 and the cylinder block.

[0022] As an improvement to the above embodiments, an L-shaped diversion channel 19 is provided on the base, and both ends of the L-shaped diversion channel penetrate through the top surface and the side surface of the base respectively. This improvement enables the electrolyte to more easily seep out from the rock specimen from top to bottom.

[0023] As an improvement to the above embodiments, the sealing cover and the pressure-bearing reaction kettle are connected by threads, which is convenient for disassembly and assembly.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A flow battery underground reservoir surrounding rock oil pressure erosion system, characterized by: Pressure reaction system, pressure adding and unloading system and conversion and control system; The pressure reaction system comprises a pressure reaction kettle, a base arranged at the bottom of the inner side of the pressure reaction kettle, a mesh cylinder placed on the base for fixing the rock mass specimen, a sealing cover connected to the pressure reaction kettle, and a pressure gauge arranged on the sealing cover for monitoring the pressure in the pressure reaction kettle; The pressure-adding and unloading system comprises a cylinder body, a piston slidingly sealed with the cylinder body, a piston rod connected with the piston, a cylinder plug fixed at the rear end of the cylinder body and threadedly connected with the piston rod, a handle connected with the end of the piston rod and a support seat for fixing the cylinder body; The conversion and control system includes a control chamber connected to the front end of the cylinder body, a pressure-resistant hose connecting the control chamber and the sealing cover, a pressure-adding and unloading control valve arranged on the pressure-resistant hose, a liquid injection observation container and an oil control valve connecting the control chamber and the liquid injection observation container. The sealing cover is provided with a liquid channel connecting the inner cavity of the pressure reactor and the pressure-resistant hose.

2. The system for preventing oil and liquid pressure erosion in surrounding rock of underground flow battery reservoir according to claim 1, characterized in that: The piston is composed of a core rod and a plug body fixed on the core rod. The core rod is connected to the piston rod through an adapter sleeve, and the adapter sleeve is rotatably connected to the front end of the piston rod.

3. The system for preventing oil and liquid pressure erosion in surrounding rock of underground flow battery reservoir according to claim 1, characterized in that: The base is provided with an L-shaped flow guiding channel, and two ends of the L-shaped flow guiding channel respectively penetrate the top surface and the side surface of the base.

4. The system for preventing oil and liquid pressure erosion in surrounding rock of underground flow battery reservoir according to claim 1, characterized in that: The sealing cover and the pressure-bearing reactor are connected via threads.

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