Expanded accident oil pool
By setting up an expanded emergency oil tank next to the original emergency oil tank, and utilizing the density difference between oil and water and the pressure balance design, the problem of insufficient capacity was solved, and capacity expansion was achieved without shutting down the power system, ensuring the safe and stable operation of the power system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-31
AI Technical Summary
The existing substation accident oil pool capacity is insufficient to meet the requirements of the new standard, and expansion must be carried out while the equipment is in operation, which will affect the safe and stable operation of the power system.
An expanded emergency oil tank was constructed next to the original emergency oil tank. By opening holes in the tank wall to connect inlet and outlet water pipes, and by utilizing the difference in oil and water density to design the elevation, oil-water separation and pressure balance were achieved, thereby increasing the volume.
Expanding the emergency oil pool without shutting down the power system ensures timely storage of transformer oil, meets the requirements of the new standards, and guarantees the safe and stable operation of the power system.
Smart Images
Figure CN224064024U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of substations, and in particular to an expansion method for emergency oil tanks, for use in scenarios where the emergency oil tank needs to be expanded. Background Technology
[0002] According to the national standard GB 50229-2006 "Code for Fire Protection Design of Thermal Power Plants and Substations", outdoor electrical equipment with a single oil capacity of 1000 kg or more should be equipped with oil storage or oil containment facilities. The volume of the oil containment facility should preferably be designed to be 20% of the oil capacity, and facilities should be provided to drain accidental oil to a safe location. When the above requirements cannot be met and the transformer is not equipped with a water spray fire extinguishing system, an oil storage facility capable of holding the entire oil capacity should be provided. When a total emergency oil storage tank with oil-water separation measures is installed, its capacity should preferably be determined as 60% of the capacity of the largest oil tank. Therefore, in the past, the capacity of emergency oil tanks in power plants and transmission and transformation projects was designed as 60% of the capacity of the largest oil tank.
[0003] In 2019, the new standard GB 50229-2019, "Fire Protection Design Standard for Thermal Power Plants and Substations," was promulgated and implemented. This standard requires that the capacity of the main emergency oil storage tank be determined based on the equipment with the largest connected oil volume, and that an oil-water separation device be installed. If these requirements cannot be met, an oil storage facility capable of accommodating the entire oil volume of the corresponding electrical equipment should be installed. In other words, the new standard requires that the volume of all emergency oil tanks be designed to be 100% of the volume of the equipment with the largest connected oil volume, thus increasing the emergency oil tank capacity. In recent years, projects built according to the old standard have successively carried out expansion projects for oil-containing electrical equipment, which raises the issue that the original emergency oil tank volume does not meet the requirements of the new standard. Therefore, there is an urgent need for an emergency oil tank that can be expanded and upgraded without interrupting operation. Utility Model Content
[0004] To address the problems of existing technologies, a method for expanding emergency oil tanks is proposed, which allows for expansion operations to be carried out without shutting down the power system, thus ensuring the safe and stable operation of the power system.
[0005] The technical solution adopted by this utility model is as follows: an expanded emergency oil tank, wherein the expanded emergency oil tank is set next to the original emergency oil tank to assist the original emergency oil tank in storing emergency oil from power plants and power transmission and transformation projects; the original emergency oil tank has openings in its tank wall; the inlet pipe of the expanded emergency oil tank is connected to the openings in the tank wall of the original emergency oil tank; the outlet pipe of the expanded emergency oil tank is connected to the sewer pipe; the expanded emergency oil tank includes an inlet pipe and an outlet pipe, wherein the center elevation of the inlet pipe of the expanded emergency oil tank is higher than the inner bottom elevation of the outlet pipe and lower than the inlet pipe elevation of the original emergency oil tank.
[0006] In one embodiment, the inlet pipe of the expanded accident oil tank is provided with a flexible waterproof sleeve.
[0007] In one embodiment, a water outlet riser is provided in the expanded accident oil tank, and the water outlet riser is connected to the water outlet horizontal pipe through the pipe body; the upper end of the water outlet riser is higher than the inner bottom elevation of the horizontal pipe, and the lower end of the water outlet riser is lower than the inner bottom elevation of the horizontal pipe.
[0008] In one embodiment, the lower end of the water outlet riser is provided with a flared opening, the specifications and height of which are consistent with the original emergency oil tank.
[0009] In one embodiment, the inner bottom elevation of the horizontal outlet pipe of the expanded accident oil tank is consistent with the inner bottom elevation of the original accident oil tank outlet pipe.
[0010] In one embodiment, the bottom elevation of the expanded accident oil tank is not higher than the bottom elevation of the original accident oil tank.
[0011] In one embodiment, both the inlet pipe and the outlet pipe have a diameter of DN400.
[0012] In one embodiment, the center elevation of the inlet pipe of the expanded accident oil tank is 0.1 meters higher than the inner bottom elevation of the horizontal outlet pipe, and the center elevation of the inlet pipe of the expanded accident oil tank is 0.49 meters lower than the inner bottom elevation of the original accident oil tank inlet pipe.
[0013] Compared with existing technologies, the advantages of this utility model are as follows: This utility model only requires opening a hole in the upper wall of the original emergency oil tank to bury a pipe. The pipe height is relatively high, which does not affect the original emergency oil tank's storage capacity. In the event of a transformer failure, the opening can be quickly sealed, and the original emergency oil tank can still be used. At the same time, the emergency oil tank can be expanded, so that the total effective volume of the two emergency oil tanks reaches 100% of the capacity of the equipment with the largest connected oil volume. This utility model solution can be carried out for expansion without shutting down the power system, effectively ensuring the safe and stable operation of the power system. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the expanded accident oil tank proposed in this utility model.
[0015] Figure 2 This is a cross-sectional view of the expanded accident oil tank proposed in this utility model. Detailed Implementation
[0016] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.
[0017] Previously, the capacity of emergency oil tanks in power plants and transmission and transformation projects was designed based on 60% of the capacity of the largest oil tank. However, the new standard requires that the volume of all emergency oil tanks be designed to be 100% of the volume of the equipment with the largest connected oil volume. Therefore, existing projects face the problem that the original emergency oil tank volume does not meet the new standard requirements when expanding oil-immersed transformers, necessitating the expansion of the emergency oil tank. However, during expansion construction, the original oil-immersed transformers often cannot be shut down, which means that the original emergency oil tank cannot be directly excavated and destroyed. It is still necessary to utilize the original emergency oil tank and expand it while the oil-immersed transformer is energized. Based on this, this embodiment proposes a method for expanding emergency oil tanks that can be carried out without shutting down the power system, thereby ensuring the safe and stable operation of the power system.
[0018] For details, please refer to Figure 1 , Figure 2 The expanded emergency oil tank is located next to the original emergency oil tank and is used to supplement the original emergency oil tank in storing emergency oil from power plants and power transmission and transformation projects. The original emergency oil tank has openings in its wall. The inlet pipe of the expanded emergency oil tank is connected to the openings in the wall of the original emergency oil tank, and the outlet pipe of the expanded emergency oil tank is connected to the sewer pipe. The expanded emergency oil tank includes an inlet pipe and an outlet pipe. The inner bottom elevation of the outlet pipe of the expanded emergency oil tank is the same as the inner bottom elevation of the outlet pipe of the original emergency oil tank. The center elevation of the inlet pipe of the expanded emergency oil tank is higher than the inner bottom elevation of the outlet pipe but lower than the inlet pipe elevation of the original emergency oil tank.
[0019] In practical applications, the size of the expanded emergency oil tank can be calculated based on the total oil volume of the expanded oil immersion equipment and the effective volume of the existing emergency oil tank. For example, assuming the original effective volume of the emergency oil tank is 70 tons and the total oil volume of the oil immersion equipment is 90 tons, then at least an expanded emergency oil tank with an effective volume of 20 tons is required. Calculations show that, taking a circular expanded emergency oil tank as an example, the diameter is designed to be 2.5 meters and the net height to be 4.65 meters. The inlet and outlet pipes can be designed with a diameter of DN400.
[0020] It should be noted that when expanding the original accident oil tank, the expansion location should be reasonably selected based on the overall layout of the plant. The inlet pipe, the expanded accident oil tank, and the outlet pipe must meet the requirements of a reasonable layout in the overall plan, with the principle of not affecting the existing buildings and underground facilities in the plant area.
[0021] In one embodiment, by making a hole in the wall of the original accident oil tank and connecting the water inlet pipe of the expanded accident oil tank to the hole, the connection between the accident oil tank and the expanded accident oil tank can be achieved. The outer surface of the water inlet pipe is covered with a flexible waterproof sleeve.
[0022] In this embodiment, the design of the inlet pipe elevation of the expanded emergency oil tank is crucial. The aim is to ensure that emergency oil enters the expanded emergency oil tank preferentially through the inlet pipe, followed by water. Since the oil discharged into the oil tank from the original emergency oil tank's inlet pipe is an oil-water mixture, the lighter oil will naturally float, while the denser water will naturally sink. Therefore, the center elevation of the expanded emergency oil tank's inlet pipe is set higher than the inner bottom elevation of the outlet horizontal pipe but lower than the original emergency oil tank's inlet pipe elevation. Specifically, the center elevation of the expanded emergency oil tank's inlet pipe is set 0.1 meters higher than the inner bottom elevation of the outlet horizontal pipe and 0.49 meters lower than the inner bottom elevation of the original emergency oil tank's inlet pipe. Utilizing the principle of oil-water density difference, this ensures that both water and emergency oil can enter the expanded emergency oil tank through the inlet pipe under various operating conditions. If the elevation is set too low, the expanded emergency oil tank will become a water column, putting water pressure on the original emergency oil tank and preventing oil from flowing into the expanded oil tank. As a result, the transformer oil will overflow through the outlet pipe of the original emergency oil tank. If the elevation is set too high, the transformer oil stored in the original emergency oil tank will also be unable to flow into the expanded oil tank. Similarly, the transformer oil will overflow through the outlet pipe of the original emergency oil tank, polluting the environment.
[0023] In one embodiment, the inner bottom elevation of the horizontal outlet pipe of the expanded accident oil tank is consistent with the inner bottom elevation of the original accident oil tank outlet pipe.
[0024] In one embodiment, the expanded accident oil tank is equipped with a water outlet riser, which is connected to the water outlet horizontal pipe through its body; the upper end of the water outlet riser is higher than the inner bottom elevation of the horizontal pipe, and the lower end of the water outlet riser is lower than the inner bottom elevation of the horizontal pipe.
[0025] In one embodiment, the lower end of the water outlet riser is provided with a flared opening, the specifications and height of which are consistent with the original emergency oil tank.
[0026] In one embodiment, the newly built emergency oil tank outlet riser is connected to the expanded emergency oil tank, so that the water inside forms a U-shaped water pressure balance. Combined with the U-shaped water pressure balance in the original emergency oil tank, a total of two U-shaped water pressure balances are formed to achieve pressure balance between the original emergency oil tank and the expanded emergency oil tank. This balances the transformer oil stored in the original and expanded emergency oil tanks, achieving the purpose of expanding the transformer oil capacity. The subsequent fire-fighting water flows out from the bottom flared outlet.
[0027] In one embodiment, the bottom elevation of the expanded accident oil tank is not higher than the bottom elevation of the original accident oil tank.
[0028] This invention only requires drilling a hole in the upper wall of the original emergency oil tank and burying a pipe. The pipe is buried at a relatively high height, which does not affect the original storage capacity of the emergency oil tank. In the event of a transformer failure, the hole can be quickly sealed, and the original emergency oil tank can still be used. At the same time, the emergency oil tank can be expanded, so that the total effective volume of the two emergency oil tanks reaches 100% of the capacity of the equipment with the largest connected oil volume. This invention allows for expansion work to be carried out without shutting down the power system, effectively ensuring the safe and stable operation of the power system.
[0029] Example 1
[0030] This embodiment proposes an expanded emergency oil tank, which is located next to the original emergency oil tank to assist the original emergency oil tank in storing emergency oil from power plants and power transmission and transformation projects. The original emergency oil tank has openings in its walls. The inlet pipe of the expanded emergency oil tank is connected to the openings in the walls of the original emergency oil tank, and the outlet pipe of the expanded emergency oil tank is connected to the sewer pipe. The center elevation of the inlet pipe of the expanded emergency oil tank is higher than the inner bottom elevation of the outlet pipe but lower than the inlet pipe elevation of the original emergency oil tank.
[0031] Example 2
[0032] Based on Example 1, the inlet pipe of the expanded accident oil tank is provided with a flexible waterproof sleeve.
[0033] Example 3
[0034] Based on Example 1, the expanded accident oil tank is equipped with a water outlet riser, which is connected to the water outlet horizontal pipe through the pipe body; the upper end of the water outlet riser is higher than the bottom elevation of the horizontal pipe, and the lower end of the water outlet riser is lower than the bottom elevation of the horizontal pipe.
[0035] Example 4
[0036] Based on Example 1, the first end of the water outlet riser is provided with a bell mouth, and the specifications and height of the bell mouth are consistent with the original accident oil tank.
[0037] Example 5
[0038] Based on Example 1, the bottom elevation of the horizontal pipe of the expanded accident oil tank outlet is consistent with the bottom elevation of the original accident oil tank outlet pipe.
[0039] Example 6
[0040] Based on Example 1, the bottom elevation of the expanded accident oil tank is not higher than the bottom elevation of the original accident oil tank.
[0041] Example 7
[0042] Based on Example 1, both the inlet pipe and the outlet pipe have a diameter of DN400.
[0043] Example 8
[0044] Based on Example 1, the center elevation of the inlet pipe of the expanded accident oil tank is 0.1 meters higher than the bottom elevation of the outlet pipe, and the center elevation of the inlet pipe of the expanded accident oil tank is 0.49 meters lower than the bottom elevation of the inlet pipe of the original accident oil tank.
[0045] The present invention can be well realized through Examples 1 to 8.
[0046] It should be noted that, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The accompanying drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0047] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. An expanded incident oil pool, characterized in that, The expansion accident oil pool is arranged beside the original accident oil pool and used for assisting the original accident oil pool to store the accident oil of power plant and power transmission and transformation project, and an opening is arranged on the pool wall of the original accident oil pool; the water inlet pipe of the expansion accident oil pool is connected with the opening on the pool wall of the original accident oil pool, and the water outlet pipe of the expansion accident oil pool is connected with a sewer pipe; the expansion accident oil pool comprises the water inlet pipe and the water outlet pipe horizontal pipe, and the center elevation of the water inlet pipe of the expansion accident oil pool is higher than the inner bottom elevation of the water outlet pipe horizontal pipe and lower than the inner bottom elevation of the water inlet pipe of the original accident oil pool.
2. The expanded spill bay of claim 1, wherein, The water inlet pipe of the expansion accident oil pool is externally provided with a flexible waterproof sleeve.
3. The expanded spill bay of claim 1, wherein, The expansion accident oil pool is internally provided with a water outlet pipe vertical pipe, and the water outlet pipe vertical pipe is connected with the water outlet pipe horizontal pipe through a pipe body; the upper end of the water outlet pipe vertical pipe is higher than the inner bottom elevation of the horizontal pipe, and the lower end of the water outlet pipe vertical pipe is lower than the inner bottom elevation of the horizontal pipe.
4. The expanded spill bay of claim 3, wherein, The lower end of the water outlet pipe vertical pipe is provided with a bell mouth, and the size and height of the bell mouth are consistent with those of the original accident oil pool.
5. The expanded spill bay of claim 1, wherein, The inner bottom elevation of the water outlet pipe horizontal pipe of the expansion accident oil pool is consistent with that of the original accident oil pool.
6. The expansion spill basin of claim 1, wherein, The pool bottom elevation of the expansion accident oil pool is not higher than that of the original accident oil pool.
7. The expansion spill basin of claim 1, wherein, The pipe diameter of the water inlet pipe and the water outlet pipe is DN400.
8. The expansion spill basin of claim 1, wherein, The center elevation of the water inlet pipe of the expansion accident oil pool is 0.1 m higher than the inner bottom elevation of the water outlet pipe horizontal pipe, and the center elevation of the water inlet pipe of the expansion accident oil pool is 0.49 m lower than the inner bottom elevation of the water inlet pipe of the original accident oil pool.