Transformer accident pool oil-water separation device

Abstract

The invention provides an oil-water separation device for a transformer accident pool, comprising an oil-water aeration tank and an oil-water separation pipe, wherein an aeration pipe and a water supply pipe are arranged at the bottom of the oil-water aeration tank, and an oil-water overflow pipe is arranged at the top, and an oil-water feed port is opened on the oil-water separation pipe, and the oil-water feed port is connected to the oil-water overflow pipe. When the sewage of the transformer accident pool is subjected to the oil-water separation operation, the sewage first enters the oil-water aeration tank, and the liquid level is controlled to the entrance of the oil-water overflow pipe. Aeration, on the one hand, separates the oil and water, and reduces the oil content in the water phase. On the other hand, the liquid level in the oil-water aeration tank fluctuates, and the transformer oil and part of the water floating on the liquid level enter the oil-water separation pipe from the oil-water overflow pipe. After a period of time, the oil-water separation pipe is allowed to stand, so that the oil and water in the oil-water separation pipe are separated into layers. After the standing and separation, the water phase at the bottom can be returned to the oil-water aeration tank for secondary aeration to increase the treatment depth. The oil phase is discharged, which greatly reduces the amount of water in the oil phase, and realizes true oil-water separation.

Description

Technical Field

[0001] The invention belongs to the technical field of safe operation of transformer substations, and in particular relates to an oil-water separation device for a transformer accident pool. Background Art

[0002] According to GB50060-2008 "3-110kV High Voltage Distribution Equipment Related Specifications", when the oil volume of a single outdoor electrical equipment is more than 1000kg, oil storage or oil blocking facilities should be installed. Specifically, facilities should be installed to drain the oil to a safe place. If this cannot meet the requirements, oil storage or oil blocking facilities that can accommodate 100% of the oil volume should be installed.

[0003] Since the transformer accident oil pool is set up in the open air, rainwater can enter and accumulate in the accident oil pool. Under normal circumstances, the rainwater evaporates naturally and does not affect the normal function of the accident pool. In two cases, the transformer accident oil pool needs to be cleaned. One is after the transformer is inspected and maintained, and the other is when the water level in the accident pool exceeds the safety threshold during heavy rain or rainy season. After the transformer inspection and maintenance operation, the transformer oil content in the oil-water mixture in the accident pool is relatively large, which can be initially separated by static stratification. After heavy rain or rainy season, the transformer oil content in the oil-water mixture in the accident pool is very small, mainly scattered oil flowers and part of the oil-water mixture floating on the water surface. Whether it is the sewage after the initial separation of the inspection and maintenance operation, or the sewage after heavy rain or rainy season, further treatment is required. Since the transformer accident pool is scattered, the amount of sewage is small and discontinuous, it is not suitable for the traditional sewage treatment mode of biochemical treatment.

[0004] In the prior art, physical methods are usually used to separate oil and water, such as flotation, adsorption, etc., but this process will produce a large amount of solid waste and cannot truly complete the oil and water separation. For example, the Chinese utility model patent with patent number 200920170656.2 discloses an oil-water separation device, including a decontamination oil-water separator, a separation fine filter and an acid removal regenerator arranged in sequence. For example, the Chinese utility model patent with patent number 201720095536.5 discloses an oil-water separator and an oil-water separation system. The above-mentioned oil-water separation device (separator or separation system) is suitable for separating transformer oil containing a small amount of water in the oil and dehydrating the oil product. When used to treat a small amount of transformer oil in sewage, only a preliminary oil-water separation can be performed on the sewage, and there is still a lot of sewage in the separated oil phase, and there is still a partial water-in-oil situation in the water phase. Summary of the invention

[0005] In view of this, the present invention provides an oil-water separation device for a transformer accident pool to solve the technical problem in the prior art that after oil-water separation of oily wastewater in a transformer accident pool, the oil phase has a large water content and the water phase treatment is unqualified.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A transformer accident pool oil-water separation device, comprising:

[0008] An oil-water aeration tank, wherein an aeration pipe and a water supply pipe are arranged at the bottom of the oil-water aeration tank, and an oil-water overflow pipe is arranged at the top; and

[0009] An oil-water separation pipe is provided with an oil-water feed port, and the oil-water feed port is connected to the oil-water overflow pipe.

[0010] Preferably, the transformer accident pool oil-water separation device also includes: a low-level circulating water tank, on which a circulating water feed pipe and a circulating water pump are provided, the circulating water feed pipe is connected to the bottom discharge port of the oil-water separation pipe, the inlet of the circulating water pump is connected to the low-level circulating water tank, and the outlet is connected to the water supply pipe.

[0011] Preferably, a liquid level sensor is provided on the oil-water separation pipe, and a liquid level control valve is provided on the circulating water feed pipe, and the liquid level control valve is interlocked with the liquid level sensor.

[0012] Preferably, a water replenishment control valve is provided on the water replenishment pipe, and the water replenishment control valve is interlocked with the liquid level sensor.

[0013] Preferably, an aeration control valve is provided on the aeration pipe, and the aeration control valve is interlocked with the liquid level sensor.

[0014] Preferably, the transformer accident pool oil-water separation device also includes a microcontroller, the microcontroller having a signal input end and a signal output end, the signal input end is electrically connected to the liquid level sensor, and the signal output end is electrically connected to the liquid level control valve, the water replenishment control valve and the aeration control valve.

[0015] Preferably, the oil-water overflow pipe is arranged obliquely, and one end of the oil-water overflow pipe close to the oil-water aeration tank is higher than the other end close to the oil-water separation pipe.

[0016] Preferably, the diameter of the oil-water separation tube is not greater than 5 cm.

[0017] Preferably, the oil-water separation tube is a serpentine tube type.

[0018] Preferably, the oil-water aeration tank comprises an aeration part, an overflow neck and a pressure relief part which are sequentially connected from bottom to top, the diameter of the overflow neck is smaller than the diameters of the aeration part and the pressure relief part, and the oil-water overflow pipe is arranged on the overflow neck.

[0019] It can be seen from the above technical scheme that the present invention provides an oil-water separation device for a transformer accident pool, and its beneficial effect is: an oil-water aeration tank and an oil-water separation pipe are provided, and the oil-water aeration tank and the oil-water separation pipe are connected through the oil-water overflow pipe. When the sewage of the transformer accident pool is subjected to the oil-water separation operation, the sewage first enters the oil-water aeration tank, and the liquid level is controlled to the inlet of the oil-water overflow pipe. Air is introduced into the oil-water aeration tank through the aeration pipe, and aeration is performed, which, on the one hand, separates the oil and water, and on the other hand, causes the liquid level in the oil-water aeration tank to fluctuate, and the transformer oil and part of the water floating on the liquid level overflow from the oil-water overflow pipe and enter the oil-water separation pipe. After a period of time, the oil-water separation pipe is left to stand, so that the oil and water in the oil-water separation pipe are separated. When the transformer accident pool sewage is treated by the transformer accident pool oil-water separation device, the emulsified transformer oil in the sewage is first separated from the water by aeration, and floats above the liquid level, thereby reducing the oil content in the water phase after the oil-water separation. The liquid level fluctuates, and the oil and part of the water floating above the liquid level enter the oil-water separation tube, stand still and separate, and the bottom water phase can be returned to the oil-water aeration tank for secondary aeration to increase the treatment depth. The oil phase is discharged, which greatly reduces the amount of water in the oil phase and realizes true oil-water separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure and flow of the oil-water separation device in the transformer accident pool.

[0021] In the figure: transformer accident pool oil-water separation device 10, oil-water aeration tank 100, aeration part 101, overflow neck 102, pressure release part 103, aeration pipe 110, aeration control valve 111, water supply pipe 120, water supply control valve 121, sewage inlet pipe 130, oil-water separation pipe 200, liquid level sensor 201, oil discharge control valve 202, oil-water overflow pipe 300, low-level circulating water tank 400, circulating water feed pipe 410, liquid level control valve 411, circulating water pump 420, microcontroller 500. DETAILED DESCRIPTION

[0022] The technical scheme and technical effects of the present invention are further elaborated in detail below in conjunction with the accompanying drawings of the present invention.

[0023] Please see Figure 1In a specific embodiment, a transformer accident pool oil-water separation device 10 is used to achieve oil-water separation of transformer accident pool sewage in a non-maintenance state, or to achieve oil-water separation of transformer accident pool sewage after preliminary separation in a maintenance state. The transformer accident pool oil-water separation device 10 includes an oil-water aeration tank 100 and an oil-water separation pipe 200. The bottom of the oil-water aeration tank 100 is provided with an aeration pipe 110 and a water supply pipe 120, and the upper part is provided with an oil-water overflow pipe 300. The oil-water separation pipe 200 is provided with an oil-water feed port, and the oil-water feed port is connected to the oil-water overflow pipe 300.

[0024] When the oil-water separation operation is performed on the sewage of the transformer accident pool, the sewage first enters the oil-water aeration tank 100, and the liquid level is controlled to the inlet of the oil-water overflow pipe 300. Air is introduced into the oil-water aeration tank 100 through the aeration pipe 110, and aeration is performed to separate the oil and water on the one hand, and to fluctuate the liquid surface in the oil-water aeration tank 100 on the other hand, and the transformer oil and part of the water floating on the liquid surface overflow from the oil-water overflow pipe 300 and enter the oil-water separation pipe 200. After a period of time, the oil and water in the oil-water separation pipe 200 are allowed to stand still to separate the oil and water in the oil-water separation pipe 200. When the transformer accident pool oil-water separation device 10 treats the sewage of the transformer accident pool, the emulsified transformer oil in the sewage is first separated from the water by aeration, and floats above the liquid surface, thereby reducing the oil content in the water phase after the oil-water separation. The liquid level fluctuates, and the oil and part of the water floating above the liquid level enter the oil-water separation tube 200, stand still and separate, and the water phase at the bottom can be returned to the oil-water aeration tank 100 for secondary aeration to increase the treatment depth. The oil phase is discharged, which greatly reduces the amount of water in the oil phase and realizes true oil-water separation.

[0025] Furthermore, the transformer accident pool oil-water separation device 10 further includes: a low-level circulating water tank 400, on which a circulating water feed pipe 410 and a circulating water pump 420 are provided, the circulating water feed pipe 410 is connected to the bottom discharge port of the oil-water separation pipe 200, the inlet of the circulating water pump 420 is connected to the low-level circulating water tank 400, and the outlet is connected to the water supply pipe 120. First, the sewage is statically layered in the oil-water separation pipe 200, and the water phase of the lower layer is discharged into the low-level circulating water tank 400 through the circulating water feed pipe 410 for temporary storage, and the oil phase can be trapped in the oil-water separation pipe 200 or discharged from the discharge port. Secondly, during the aeration process of the oil-water aeration tank 100, when the liquid level of the oil-water aeration tank 100 is low and the liquid level fluctuation is not sufficient to cause the oil-water mixture to overflow into the oil-water overflow pipe 300, the circulating water pump 420 is started to pump the wastewater stored in the low-level circulating water tank 400 into the oil-water aeration tank 100, so as to replenish the liquid level loss on the one hand and realize the sewage circulating aeration treatment on the other hand, thereby improving the sewage treatment effect.

[0026] Preferably, the outlet of the circulating water pump 420 is connected to the bottom or middle of the oil-water aeration tank 100 to avoid level fluctuations during the circulating water replenishment process, causing excessive water to overflow into the oil-water separation pipe 200, thereby improving separation efficiency. Furthermore, the sewage inlet pipe 130 for sending the transformer accident pool sewage into the oil-water aeration tank 100 is arranged at the inlet end or outlet end of the circulating water pump 420, so that the circulating water pump 420 can be used to feed the oil-water aeration tank 100, saving equipment installation space and reducing operating costs.

[0027] Please continue to see Figure 1 In order to facilitate industrial production and realize automatic control, in a preferred embodiment, the transformer accident pool oil-water separation device 10 is also provided with an automatic control component.

[0028] For example, the oil-water separation tube 200 is provided with a liquid level sensor 201, and the circulating water feed pipe 410 is provided with a liquid level control valve 411, and the liquid level control valve 411 is interlocked with the liquid level sensor 201. That is to say, when the liquid level sensor 201 detects that the liquid level of the oil-water separation tube 200 reaches the high threshold, static stratification begins, and after a predetermined time, the liquid level control valve 411 is automatically opened to discharge the water phase into the low-level circulating water tank 400. When the liquid level reaches the low threshold, the liquid level control valve 411 is automatically closed to stop draining. In this way, after each static stratification, the oil phase is trapped in the oil-water separation tube 200, and an oil column is formed through continuous accumulation, thereby further reducing the water content in the oil phase, reducing the amount of waste oil to be treated, and reducing the cost of sewage disposal.

[0029] For example, the water replenishment pipe 120 is provided with a water replenishment control valve 121, and the water replenishment control valve 121 is interlocked with the liquid level sensor 201. That is to say, during the aeration process, when the liquid level in the oil-water separation pipe 200 does not reach the high level threshold, but the liquid level is stagnant (the liquid level change rate is zero or decreases), the water replenishment control valve is opened to replenish water into the oil-water aeration tank 100 to keep the liquid level of the oil-water aeration tank 100 stable.

[0030] For example, the aeration pipe 110 is provided with an aeration control valve 111, and the aeration control valve 111 is interlocked with the liquid level sensor 201. That is, when the liquid level in the oil-water separation pipe 200 reaches the high level threshold, the aeration control valve 111 is automatically closed to stop aeration. The sewage in the oil-water aeration tank 100 and the sewage in the oil-water separation pipe 200 are allowed to stand and stratify at the same time.

[0031] For example, the transformer accident pool oil-water separation device 10 further includes a microcontroller 500, the microcontroller 500 having a signal input end and a signal output end, the signal input end being electrically connected to the liquid level sensor 201, and the signal output end being electrically connected to the liquid level control valve 411, the water replenishment control valve 121 and the aeration control valve 111. In a preferred embodiment, the transformer accident pool oil-water separation includes the following process.

[0032] When the liquid level of the oil-water aeration tank 100 reaches the target liquid level, the aeration control valve 111 is opened to perform aeration. During the aeration process, the liquid level of the oil-water aeration tank 100 fluctuates, and the upper oil-water mixture enters the oil-water separation tube 200. The liquid level sensor 201 detects the liquid level of the oil-water separation tube 200. When the liquid level change rate of the oil-water separation tube 200 decreases or the liquid level does not rise, the water replenishment control valve 121 is opened to replenish sewage into the oil-water aeration tank 100. When the liquid level of the oil-water separation tube 200 reaches the high threshold (for example, when the liquid level of the oil-water separation tube 200 reaches 95%), the water replenishment control valve 121 is closed, the aeration control valve 111 is closed, and the system is left to stand. After standing for a period of time (for example, after standing for 1 hour), the liquid level control valve 411 is opened to discharge the water at the bottom of the oil-water separation tube 200 into the low-level circulating water tank 400. When the liquid level of the oil-water separation tube 200 reaches the low threshold value (for example, when the liquid level of the oil-water separation tube 200 reaches 10%), the liquid level control valve 411 is closed, and the aeration control valve 111 is opened at the same time, and the above steps are repeated several times, for example, the last step is repeated 3 to 5 times. Furthermore, an oil discharge control valve 202 is also provided at the bottom of the oil-water separation tube 200. After the liquid level control valve 411 is closed for the last time, the oil discharge control valve 202 is opened to discharge the oil and oil-water mixture in the upper layer of the oil-water separation tube 200.

[0033] In a specific embodiment, the oil-water overflow pipe 300 is arranged at an angle, and the end of the oil-water overflow pipe 300 close to the oil-water aeration tank 100 is higher than the end close to the oil-water separation pipe 200, so that the oil-water mixture overflowing from the oil-water aeration tank 100 into the oil-water overflow pipe 300 flows into the oil-water separation pipe 200 by gravity.

[0034] In a specific embodiment, the diameter of the oil-water separation tube 200 is not greater than 5 cm. In principle, the smaller the diameter of the oil-water separation tube, the more conducive it is for the pressure-variable oil floating above the oil-water interface to gather and form an oil column. However, considering that the amount of oil-water mixture overflowing into the oil-water separation tube 200 during one aeration process is sufficient to reduce the number of cyclic aeration times, it is preferred that the diameter of the oil-water separation tube 200 is 2 cm to 3 cm. At the same time, the oil-water separation tube 200 has a certain height, for example, the height of the oil-water separation tube 200 is 80 cm to 150 cm, so that the oil-water separation tube 200 has sufficient volume, thereby reducing the number of cyclic aeration times. For example, the oil-water separation tube 200 is a serpentine tube type to further increase the volume of the oil-water separation tube 200.

[0035] It is worth noting that, since the diameter of the oil-water separation tube 200 is small, or a serpentine pipe is provided, and the amount of the oil-water mixture overflowing from the oil-water aeration tank 100 to the oil-water separation tube 200 is small, the oil-water mixture flows down along the tube wall of the oil-water separation tube 200 in the process of flowing from the upper part to the lower part of the oil-water separation tube 200. Since the surface tension of the transformer oil and water on the tube wall of the oil-water separation tube 200 is different, the transformer oil is easy to adhere to the tube wall of the oil-water separation tube 200, while the water is accelerated to flow down to the bottom of the oil-water separation tube 200, which is conducive to the rapid separation of oil and water in the oil-water separation tube 200 and improves the oil-water separation efficiency.

[0036] In a preferred embodiment, the oil-water aeration tank 100 includes an aeration portion 101, an overflow neck 102 and a pressure relief portion 103 connected in sequence from bottom to top, the diameter of the overflow neck 102 is smaller than the diameters of the aeration portion 101 and the pressure relief portion 103, and the oil-water overflow pipe 300 is arranged on the overflow neck 102. Preferably, the upper portion of the aeration portion 101 is arranged in an arc shape. In other words, the cross-sectional area at the bottom of the oil-water aeration tank 100 is relatively large, and gradually shrinks upward, and when it reaches the overflow neck 102, the cross-sectional area becomes smaller. The sewage from the transformer accident pool enters the oil-water aeration tank 100, and the transformer oil is guided by the aeration portion 101 and converges to the overflow neck 102, and finally forms an area with a higher oil content in the overflow neck 102. During the aeration process, the liquid level at the overflow neck 102 fluctuates, and the oil-water mixture with a high oil content at the overflow neck 102 overflows into the oil-water overflow pipe 300, thereby accelerating the oil-water separation process. The pressure relief portion 103 is provided to prevent excessive fluctuations in the liquid level during the aeration process, which may cause the liquid level to suddenly rise above the pressure relief portion 103, thereby causing pollution to overflow.

[0037] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A transformer accident pool oil-water separation device, characterized in that: include: An oil-water aeration tank, the oil-water aeration tank comprising an aeration part, an overflow neck and a pressure relief part connected in sequence from bottom to top, the upper part of the aeration part is arranged in an arc shape, the cross-sectional area of ​​the bottom of the oil-water aeration tank is relatively large and gradually shrinks upward, the diameter of the overflow neck is smaller than the diameters of the aeration part and the pressure relief part, the bottom of the oil-water aeration tank is provided with an aeration pipe and a water supply pipe, and the upper part is provided with an oil-water overflow pipe; and an oil-water separation pipe, the oil-water separation pipe is provided with an oil-water feed port, the oil-water feed port is connected to the oil-water overflow pipe, the oil-water overflow pipe is arranged on the overflow neck, the oil-water overflow pipe is arranged obliquely, and the end of the oil-water overflow pipe close to the oil-water aeration tank is higher than the end close to the oil-water separation pipe.

2. The transformer accident pool oil-water separation device according to claim 1, characterized in that: Also includes: A low-level circulating water tank is provided with a circulating water feed pipe and a circulating water pump, the circulating water feed pipe is connected to the bottom discharge port of the oil-water separation pipe, the inlet of the circulating water pump is connected to the low-level circulating water tank, and the outlet is connected to the water supply pipe.

3. The transformer accident pool oil-water separation device according to claim 2, characterized in that: The oil-water separation pipe is provided with a liquid level sensor, the circulating water feed pipe is provided with a liquid level control valve, and the liquid level control valve is interlocked with the liquid level sensor.

4. The transformer accident pool oil-water separation device according to claim 3, characterized in that: The water supply pipe is provided with a water supply control valve, and the water supply control valve is interlocked with the liquid level sensor.

5. The transformer accident pool oil-water separation device according to claim 4, characterized in that: The aeration pipe is provided with an aeration control valve, and the aeration control valve is interlocked with the liquid level sensor.

6. The transformer accident pool oil-water separation device according to claim 5, characterized in that: It also includes a microcontroller, which has a signal input end and a signal output end. The signal input end is electrically connected to the liquid level sensor, and the signal output end is electrically connected to the liquid level control valve, the water replenishment control valve and the aeration control valve.

7. The transformer accident pool oil-water separation device according to claim 1, characterized in that: The diameter of the oil-water separation tube is not greater than 5 cm.

8. The transformer accident pool oil-water separation device according to claim 7, characterized in that: The oil-water separation tube is a serpentine tube type.

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