Automatic dehydration system for oil tank

Abstract

The utility model provides an automatic dehydration system of an oil tank, including: light oil storage tank, buffer water cutting tank, explosion-proof control box and drainage flow cell, wherein light oil storage tank is connected with buffer water cutting tank through storage tank drainage pipe, the storage tank drainage pipe is equipped with first flow regulating valve and preposition sensor, buffer water cutting tank is equipped with middle sensor, and the explosion-proof control box is equipped with explosion-proof control box. A siphon drainage pipe is installed in the buffering water draining tank, a water outlet of the siphon drainage pipe is communicated with a water inlet of the drainage flow cell, and a first anti-explosion valve, a second anti-explosion valve, a second flow adjusting valve and a flow indicator are sequentially installed on the connecting section of the siphon drainage pipe and the drainage flow cell in the liquid flowing direction. And a rear sensor is arranged in the drainage flow cell. According to the automatic dehydration system for the oil tank, the secondary buffering and secondary layering design of the buffering water cutting tank and the siphon drainage pipe is adopted, the overall sensitivity and stability of the system are high, the anti-explosion control box is arranged, and the overall safety of the system is high.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-water separation equipment, in particular to an automatic dehydration system for an oil tank. Background Art

[0002] Oil tanks are responsible for major production tasks such as receiving materials, feeding materials, and shipping finished oil products. Being able to safely remove water from oil tanks is an important task to ensure the safe and stable operation of oil refining and chemical plants. Traditional manual dehydration requires operators to observe by the sewage pool. Since the visual characteristics of finished oil and water are not obviously different, it is difficult to master, which often leads to oil in the discharged water, increasing the burden of sewage treatment, causing resource waste and environmental pollution. A slight negligence may cause a safety accident. In addition, oil products contain many toxic and harmful gases, which have a serious impact on the physical and mental health of operators.

[0003] The widely used oil tank dehydration device is mainly a float lever mechanical structure. The advantages of this type of water cutter are low cost and large displacement. Its working principle is to use the density difference of each component of the liquid in a static or slow flow state. Under the action of gravity, the heavier components are separated and gradually settled to the bottom, and then the density difference between different oil media and water is used to generate buoyancy. The lever principle is used to rely on the buoyancy difference of the float in the oil-water medium to make the float move up and down. The drainage is completed by controlling the drainage valve at the bottom of the water cutter through a high-sensitivity lever system. The internal mechanical structure of this type of water cutter is susceptible to wall adhesion and corrosion by dirt in the oil, and its operating sensitivity is easily affected. If it is not cleaned in time, it is easy to cause the valve to be not closed tightly and cause "oil leakage" and "oil leakage" accidents. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model proposes an automatic oil tank dehydration system, which adopts a secondary buffering and secondary stratification design of a buffer water cut-off tank and a siphon drain pipe. The system has high overall sensitivity and stability and is equipped with an explosion-proof control box, so the system has high overall safety.

[0005] In order to realize the above technical scheme, the utility model provides an automatic dehydration system for oil tanks, including: a light oil storage tank, a buffer cut-off tank, an explosion-proof control box and a drainage circulation pool, wherein a storage tank drain pipe is arranged at the bottom of the light oil storage tank, the water outlet of the storage tank drain pipe is connected with the water inlet of the buffer cut-off tank, a first flow regulating valve and a front sensor are installed on the storage tank drain pipe, a sensor installation probe rod extending downward into the buffer cut-off tank is installed on the top of the buffer cut-off tank, a central sensor is installed at the bottom of the sensor installation probe rod, a siphon drain pipe is installed in the buffer cut-off tank, and the The water outlet of the siphon drain pipe is connected with the water inlet of the drainage circulation pool. The connecting section of the siphon drain pipe and the drainage circulation pool is installed with a first explosion-proof valve, a second explosion-proof valve, a second flow regulating valve and a flow indicator in sequence according to the direction of liquid flow. A post sensor is installed in the drainage circulation pool, and a sample tube is arranged on the drainage circulation pool. The sample tube is installed with a third explosion-proof valve and a third manual valve. The third explosion-proof valve, the second explosion-proof valve, the first explosion-proof valve, the post sensor, the middle sensor, the front sensor, the first flow regulating valve and the second flow regulating valve are respectively electrically connected to the explosion-proof control box.

[0006] In the above technical scheme, during actual operation, the mixed liquid (oil-water mixture) in the light oil storage tank enters the buffer water cut tank through the storage tank drain pipe, and the oil-water mixture flows from top to bottom. At the same time, the light oil and water will be secondary stratified due to the density difference. Part of the light oil moves upward, and the heavy water flows downward. Then, the pressure difference between the drainage circulation pool and the buffer water cut tank is used to transport the water at the bottom of the buffer water cut tank to the drainage circulation pool through the siphon drain pipe. The controller in the explosion-proof control box can accurately control the first flow regulating valve and the second flow regulating valve through the feedback signals of three high-precision microwave sweep oil-water sensors, such as the rear sensor, the middle sensor, and the front sensor, to accurately cut water. The buffer water cut tank structure in this oil tank automatic dehydration system adopts the siphon drainage method. Compared with the lower end direct discharge method of the ordinary water cutter, the oil stratification in the tank is more thorough and the drainage control is more precise. This oil tank automatic dehydration system is equipped with three high-precision microwave sweeping oil-water sensors (front sensor, middle sensor and rear sensor respectively). The sensor sensing probe, metal shell and internal electronic unit form a high-frequency resonant circuit. A high-frequency electric field is generated at the sensing probe, which accurately identifies the change in the dielectric constant of the medium at the probe, thereby identifying the change in the oil content in the water, and feeds back the signal to the controller in the explosion-proof control box, so that the controller controls the valve opening on the drainage control pipeline to achieve precise drainage.

[0007] Preferably, a water cut-off tank drain pipe is installed at the bottom of the buffer water cut-off tank, and a fourth manual valve is installed on the water cut-off tank drain pipe. When the drainage is completed, the oil and dirt in the buffer water cut-off tank can be discharged outward through the water cut-off tank drain pipe.

[0008] Preferably, the drainage circulation pool is connected to an external sewage pipeline through a sewage pipe, and the separated sewage can be discharged externally through the sewage pipeline.

[0009] Preferably, an exhaust pipe is provided on the top of the buffer cut-off tank, and a first manual valve is installed on the exhaust pipe to discharge oil and gas that may exist in the buffer cut-off tank to the outside.

[0010] Preferably, a sample bucket is provided below the sample tube, and a small amount of water sample can be collected by the sample bucket to check the drainage effect.

[0011] The beneficial effects of an automatic oil tank dehydration system provided by the utility model are: the automatic oil tank dehydration system has a simple structure, reasonable design, and convenient operation. It adopts a secondary buffering and secondary stratification design of a buffer cut-off tank and a siphon drain pipe. The overall sensitivity and stability of the system are high, and it is equipped with an explosion-proof control box, and the overall safety of the system is high. In actual operation, the mixed liquid (oil-water mixture) in the light oil storage tank enters the buffer cut-off tank through the tank drain pipe, and the oil-water mixture flows from top to bottom. At the same time, the light oil and water will be secondary stratified due to the density difference. Part of the light oil moves upward, and the heavy water flows downward. Then, the pressure difference between the drainage circulation pool and the buffer cut-off tank is used to transport the water at the bottom of the buffer cut-off tank to the drainage circulation pool through the siphon drain pipe. The controller in the explosion-proof control box can accurately control the first flow control valve and the second flow control valve through the feedback signals of three high-precision microwave sweep oil-water sensors such as the rear sensor, the middle sensor, and the front sensor, and accurately cut water. The buffer water cut-off tank structure in this oil tank automatic dehydration system adopts the siphon drainage method. Compared with the direct discharge method at the bottom of the ordinary water cutter, the oil in the tank is more thoroughly stratified and the drainage control is more precise. This oil tank automatic dehydration system is equipped with three high-precision microwave frequency sweep oil-water sensors (front sensor, middle sensor and rear sensor respectively). The sensor sensing probe, metal shell and internal electronic unit form a high-frequency resonant circuit. A high-frequency electric field is generated at the sensing probe, which accurately identifies the change in the dielectric constant of the medium at the probe, thereby identifying the change in the oil content in the water, and feedbacks the signal to the controller in the explosion-proof control box, so that the controller controls the valve opening on the drainage control pipeline to achieve precise drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structural connection of the utility model.

[0013] Figure 2 It is a schematic diagram of the local structural connection of the utility model.

[0014] In the figure: 1. Light oil storage tank; 2. Storage tank drain pipe; 3. First flow regulating valve; 4. Buffer water cut-off tank; 5. Explosion-proof control box; 6. Front sensor; 7. Middle sensor; 8. Exhaust pipe; 9. First manual valve; 10. Sensor installation probe; 11. Siphon drain pipe; 12. Second manual valve; 13. First explosion-proof valve; 14. Second explosion-proof valve; 15. Second flow regulating valve; 16. Flow indicator; 17. Drainage circulation pool; 18. Rear sensor; 19. Third explosion-proof valve; 20. Drain pipe; 21. Sample tube; 22. Third manual valve; 23. Sample bucket; 24. Water cut-off tank drain pipe; 25. Fourth manual valve. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. All other embodiments obtained by ordinary personnel in this field without creative work are within the scope of protection of the utility model.

[0016] Embodiment: An automatic dehydration system for oil tanks.

[0017] Reference Figure 1 and Figure 2 As shown, an automatic dehydration system for oil tanks comprises: a light oil storage tank 1, a buffer cut-off tank 4, an explosion-proof control box 5 and a drainage circulation pool 17, wherein a storage tank drain pipe 2 is arranged at the bottom of the light oil storage tank 1, the water outlet of the storage tank drain pipe 2 is connected to the water inlet of the buffer cut-off tank 4, and the oil-water mixture in the light oil storage tank 1 is discharged into the buffer cut-off tank 4 via the storage tank drain pipe 2; a first flow regulating valve 3 and a pre-sensor 6 are installed on the storage tank drain pipe 2, the first flow regulating valve 3 is used to control the water inlet amount of the buffer cut-off tank 4, and the pre-sensor 6 is used to monitor the oil content in the water in the storage tank drain pipe 2;

[0018] A sensor installation probe 10 extending downward into the buffer cut-water tank 4 is installed on the top of the buffer cut-water tank 4, and a central sensor 7 is installed at the bottom of the sensor installation probe 10. The sensor 7 is used to monitor the oil content in the water in the buffer cut-water tank 4; a cut-water irrigation drainage pipe 24 is installed at the bottom of the buffer cut-water tank 4, and a fourth manual valve 25 is installed on the cut-water irrigation drainage pipe 24. When the drainage is completed, the oil in the buffer cut-water tank 4 can be discharged to the outside through the cut-water irrigation drainage pipe 24; an exhaust pipe 8 is provided on the top of the buffer cut-water tank 4, and a first manual valve 9 is installed on the exhaust pipe 8, which can discharge the oil and gas that may exist in the buffer cut-water tank 4 to the outside;

[0019] A siphon drain pipe 11 is installed in the buffer cut-off tank 4, the water outlet of the siphon drain pipe 11 is connected to the water inlet of the drainage circulation pool 14, and the connecting section of the siphon drain pipe 11 and the drainage circulation pool 14 is sequentially installed with a first explosion-proof valve 13, a second explosion-proof valve 14, a second flow regulating valve 15 and a flow indicator 16 according to the direction of liquid flow, wherein the second flow regulating valve 15 is used to control the flow of siphon, the flow indicator 16 is used to display the flow of siphon water in real time, and the first explosion-proof valve 13 and the second explosion-proof valve 14 are used to ensure the safe operation of the system;

[0020] A post sensor 18 is installed in the drainage circulation pool 14, and the post sensor 18 is used to monitor the oil content in the water in the drainage circulation pool 14 in real time; the drainage circulation pool 14 is connected to the external sewage pipeline through the sewage pipe 20, and the separated sewage can be discharged to the outside through the sewage pipeline; a sample pipe 21 is arranged on the drainage circulation pool 14, and the sample pipe 21 is installed with a third explosion-proof valve 19 and a third manual valve 22, and a sample bucket 23 is arranged below the sample pipe 23, and a small amount of water sample can be collected by the sample bucket 23 to check the drainage effect;

[0021] In this embodiment, the third explosion-proof valve 19, the second explosion-proof valve 14, the first explosion-proof valve 13, the rear sensor 18, the middle sensor 7, the front sensor 6, the first flow regulating valve 3 and the second flow regulating valve 15 are respectively electrically connected to the explosion-proof control box 3. During actual operation, the oil content in the water at different positions can be detected by the rear sensor 18, the middle sensor 7, and the front sensor 6, and then a signal is given, and the flow rate of the first flow regulating valve 3 and the second flow regulating valve 15 can be accurately controlled by the explosion-proof control box 3 to achieve precise water cutting.

[0022] This oil tank automatic dehydration system has a simple structure, reasonable design, and convenient operation. It adopts a secondary buffering and secondary stratification design of a buffer cut-off tank 4 and a siphon drain pipe 11. The overall sensitivity and stability of the system are high. It is also equipped with an explosion-proof control box 5, and the overall safety of the system is high. During actual operation, the mixed liquid (oil-water mixture) in the light oil storage tank 1 enters the buffer cut-off tank 4 through the storage tank drain pipe 2, and the oil-water mixture flows from top to bottom. At the same time, the light oil and water will undergo secondary stratification due to the density difference. Part of the light oil moves upward, and the heavy water flows downward. Then, the pressure difference between the drainage circulation pool 14 and the buffer cut-off tank 4 is used to transport the water at the bottom of the buffer cut-off tank 4 to the drainage circulation pool 14 through the siphon drain pipe 11. The controller in the explosion-proof control box 3 can accurately control the first flow regulating valve 3 and the second flow regulating valve 16 through the signals fed back by three high-precision microwave sweeping oil-water sensors, namely the front sensor 6, the middle sensor 7, and the rear sensor 18. Once the rear sensor 18 detects that the oil content in the water in the drainage circulation pool 14 increases, the second flow regulating valve 16 can be closed immediately through the explosion-proof control box 3 to ensure the quality of oil-water separation and achieve precise water cutting.

[0023] The buffer water cut-off tank 4 in the automatic dehydration system of the oil tank adopts the siphon drainage method in structure. Compared with the direct drainage method at the bottom of the ordinary water cutter, the oil stratification in the buffer water cut-off tank 4 is more thorough, and the drainage control is more precise. The automatic dehydration system of the oil tank is equipped with three high-precision microwave sweeping oil-water sensors (respectively, the front sensor 6, the middle sensor 7 and the rear sensor 18). The sensor sensing probe, the metal shell and the internal electronic unit form a high-frequency resonant circuit, and a high-frequency electric field is generated at the sensing probe, which accurately identifies the change in the dielectric constant of the medium at the probe, thereby identifying the change in the oil content in the water, and feedbacks the signal to the controller in the explosion-proof control box 3, so that the controller controls the valve opening on the drainage control pipeline to achieve precise drainage.

[0024] The above is only a preferred embodiment of the present invention, but the present invention should not be limited to the contents disclosed in the embodiment and the drawings, so any equivalent or modification completed without departing from the spirit disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. An automatic oil tank dehydration system, characterized in that include: A light oil storage tank, a buffer cut-off tank, an explosion-proof control box and a drainage circulation pool, wherein a tank drain pipe is arranged at the bottom of the light oil storage tank, the water outlet of the tank drain pipe is connected to the water inlet of the buffer cut-off tank, a first flow regulating valve and a front sensor are installed on the tank drain pipe, a sensor installation probe rod extending downward into the buffer cut-off tank is installed on the top of the buffer cut-off tank, a central sensor is installed at the bottom of the sensor installation probe rod, a siphon drain pipe is installed in the buffer cut-off tank, and the water outlet of the siphon drain pipe is connected to the water inlet of the drainage circulation pool. The water inlet is connected, and the connecting section between the siphon drain pipe and the drainage circulation pool is installed with the first explosion-proof valve, the second explosion-proof valve, the second flow regulating valve and the flow indicator in sequence according to the direction of liquid flow. A post sensor is installed in the drainage circulation pool, and a sample retention tube is arranged on the drainage circulation pool. The sample retention tube is installed with a third explosion-proof valve and a third manual valve. The third explosion-proof valve, the second explosion-proof valve, the first explosion-proof valve, the post sensor, the middle sensor, the front sensor, the first flow regulating valve and the second flow regulating valve are respectively electrically connected to the explosion-proof control box.

2. The automatic oil tank dehydration system according to claim 1, characterized in that: A water cut-off tank drainage pipe is installed at the bottom of the buffer water cut-off tank, and a fourth manual valve is installed on the water cut-off tank drainage pipe.

3. The automatic oil tank dehydration system according to claim 1, characterized in that: The drainage circulation pool is connected to an external sewage pipeline through a sewage pipe.

4. The automatic oil tank dehydration system according to claim 1, characterized in that: An exhaust pipe is arranged on the top of the buffer water cutting tank, and a first manual valve is installed on the exhaust pipe.

5. The automatic oil tank dehydration system according to claim 1, characterized in that: A sample retaining bucket is arranged below the sample retaining tube.

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