Tank root dehydration device of oil product storage tank

Abstract

The utility model provides a tank root dewatering device of an oil product storage tank, which belongs to the technical field of automatic dewatering of storage tanks and comprises a liquid storage tank, a first pipeline is arranged between the liquid storage tank and a water storage area of the oil product storage tank, a first electromagnetic valve is arranged between a two-way pump and the liquid storage tank, and one end of an oil return component is arranged between the two-way pump and the first electromagnetic valve. The other end of the oil return assembly is embedded into the top of the liquid storage tank, and along with the decline of the water level, when the first sensor and the third sensor detect that the liquid level is oil, the second electromagnetic valve is closed, and the first valve is automatically opened at the same time; and then the output direction of the first pressure pump is adjusted, so that the oil chemical substances in the liquid storage tank flow back into the storage tank through the first pressure pump. Therefore, the separated oil is brought back to the oil product storage tank, the recovery rate of the oil product is improved, and waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic dehydration of storage tanks, in particular to a root dehydration device for oil product storage tanks. Background Technique

[0002] In petrochemical enterprises, tank dehydration is a very important task. Crude oil must be dehydrated before entering chemical plants; otherwise, various accidents will occur. Intermediate raw materials must be dehydrated before entering the next processing step; refined oil must be dehydrated before being sold. Existing automatic tank dehydration technologies include: liquid column resonance sensor dehydration, mechanical float dehydrator, tuning fork resonance sensor dehydration, and ultrasonic sensor dehydration.

[0003] A related technology (publication number: CN215288651U) discloses an intelligent dehydration device for refined oil storage tanks. The disclosed technical solution is as follows: after detecting the capacitance value of the liquid by a capacitance sensor to judge the water content inside the liquid, the liquid is discharged into a sewage tank or a waste oil tank through the cooperation of a second switching valve and a third switching valve, thereby completing the dehydration process of the refined oil storage tank. Through the action of a distillation component, the waste oil in the waste oil tank is distilled and concentrated and then discharged into the refined oil storage tank through an oil return pipeline, thereby effectively avoiding waste of resources.

[0004] In the above disclosed technical solution, it is found that the following problems exist in the related technology: existing ultrasonic sensors are easily contaminated by impurities in the oil product, resulting in inaccurate measurement results; the pipeline is too small and the sensor spacing is too short, resulting in less dehydration volume; at the same time, for emulsified oil, only relying on gravity sedimentation, the separation effect is not good. For this reason, we propose a new root dehydration device for oil product storage tanks.

[0005] It should be noted that the information disclosed in the above background technical part is only used to strengthen the understanding of the background technical part of this application, and therefore may include prior art information that is not known to those of ordinary skill in the art. Summary of the Utility Model

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art or related technologies. In order to solve the problem of low dehydration efficiency existing in the above prior art, the utility model provides a root dehydration device for oil product storage tanks, which combines a dehydration mechanism with an oil product demulsification part to achieve the effect of improving dehydration efficiency. The specific technical solution is as follows:

[0007] An oil tank root dehydration device for an oil storage tank, including a liquid storage tank, is characterized in that: a first pipeline is arranged between the liquid storage tank and the water storage area of the oil storage tank, and a two-way pump is arranged on the first pipeline. A first electromagnetic valve is arranged on the outer wall of the first pipeline, and the first electromagnetic valve is arranged between the two-way pump and the liquid storage tank. One end of an oil return assembly is arranged between the two-way pump and the first electromagnetic valve, and the other end of the oil return assembly is embedded in the top of the liquid storage tank. A dehydration assembly for draining water is embedded in the side wall of the liquid storage tank near the bottom, and an ultrasonic sensing group for detecting the oil level and water level is arranged on the side wall of the liquid storage tank.

[0008] In the above technical solution, the oil return assembly includes an oil return pipe embedded and installed on the top of the liquid storage tank. The other end of the oil return pipe is embedded and installed on the outer wall of the first pipeline, and the oil return pipe is located between the two-way pump and the first electromagnetic valve. A first pressure pump is arranged on the outer wall of the oil return pipe.

[0009] The dehydration assembly includes a dehydration pipeline embedded and installed on the side wall of the liquid storage tank near the bottom. A second electromagnetic valve is arranged on the dehydration pipeline. A fifth sensor is arranged on the outer wall of the dehydration pipeline, and a second pressure pump is arranged on the dehydration pipeline.

[0010] The ultrasonic sensing group includes a first sensor, a second sensor, a third sensor, and a fourth sensor sequentially embedded in the side wall of the liquid storage tank, and the first sensor, the second sensor, the third sensor, and the fourth sensor are evenly arranged from top to bottom.

[0011] A coalescing material for demulsifying oil is arranged on the inner wall of the liquid storage tank.

[0012] The end of the oil return pipe embedded in the liquid storage tank is a bent pipe.

[0013] The bottom of the liquid storage tank is funnel-shaped.

[0014] Protecting shells are arranged on the outside of the first sensor, the second sensor, the third sensor, and the fourth sensor located outside the inner cavity of the liquid storage tank.

[0015] The dehydration pipeline is composed of a dn200 pipeline and two eccentric reducers, and both the inlet and outlet are dn50.

[0016] An extension pipe is sleeved outside the end of the oil return pipe embedded in the liquid storage tank, and a floating block is sleeved outside the end of the extension pipe away from the oil return pipe.

[0017] Compared with the prior art, the beneficial effects of the present utility model are: The oil tank root dehydration device of this oil storage tank:

[0018] 1. The water at the lower part of the oil storage tank is made to flow into the bottom of the liquid storage tank through a two-way pump. Through the funnel-shaped bottom at the bottom of the liquid storage tank, solid impurities settle, thereby filtering the solid impurities in the water and avoiding pipeline blockage.

[0019] 2. After the water in the oil storage tank flows into the liquid storage tank, dehydration operation is carried out through the second pressure pump on the dehydration pipeline. When the liquid storage tank is about to be filled with oil, the output direction of the two-way pump is adjusted so that the oil chemical substances in the liquid storage tank enter the first pipeline through the first pressure pump from the oil return pipe and finally enter the oil storage tank. Thus, the separated oil is brought back into the oil storage tank, thereby improving the oil recovery rate and avoiding waste.

[0020] 3. The floating block ensures that the extension pipe is on the oil surface, ensuring the stability of the oil pumping-back process. When the second sensor or the fourth sensor detects the water surface after the oil on the water surface is cleaned, the first pressure pump is turned off. When the oil inside gradually increases and the first sensor or the third sensor detects the oil surface, a signal is transmitted to the first pressure pump to carry out oil return.

[0021] 4. The glass fiber on the inner wall of the liquid storage tank captures water droplets, making the coalesced water droplets form large water droplets. Then, through gravity sedimentation, the water is located below the oil, causing the oil to demulsify and finally forming an oil-water separation layer, thereby improving the oil-water separation effect.

[0022] 5. The end of the first pipeline in the liquid storage tank is a bent pipe. By setting the bent pipe, the oil separated inside the liquid storage tank cannot flow back.

[0023] 6. The change in the diameter of the dehydration pipeline can change the flow rate of the liquid in the liquid storage tank when it flows in the dehydration pipeline, thereby achieving the effect of concentrating water and collecting sand, and preventing solid impurities from depositing in the pipeline and causing blockage.

[0024] 7. The fifth sensor is mainly used to ensure that the water coming out of the dehydration pipeline does not carry oil. When the fifth sensor detects oil in the water, it will control the valve, the second solenoid valve, to close to prevent oil loss.

[0025] 8. This device can increase the dehydration amount and improve the efficiency of the dehydration process by cooperating with a small liquid storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a root dehydration device for an oil storage tank of the present utility model;

[0027] Figure 2 It is a partial structural sectional view of the liquid storage tank of the present utility model;

[0028] Figure 3Cross-sectional view of the liquid storage tank structure for Part 2 of the embodiment of the present utility model;

[0029] Among them, Figures 1 to 3 The corresponding relationship between the reference numerals and component names in the figure is as follows: 1 - liquid storage tank, 2 - first pipeline, 3 - oil return pipe, 4 - dehydration pipeline, 6 - second solenoid valve, 7 - first sensor, 8 - second sensor, 9 - third sensor, 10 - fourth sensor, 11 - fifth sensor, 12 - control cabinet, 13 - second pressure pump, 14 - first solenoid valve, 15 - bidirectional pump, 16 - coalescing material, 17 - first pressure pump, 18 - extension pipe, 19 - floating block. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] Next, in combination with specific implementation cases and the attached Figure 1 and the attached Figure 2 The present utility model will be further described, but the present utility model is not limited to these embodiments.

[0032] Embodiment 1

[0033] A root dehydration device for an oil storage tank includes a liquid storage tank 1. A first pipeline 2 is provided between the liquid storage tank 1 and the water storage area of the oil storage tank. One end of the first pipeline 2 is fixedly embedded on the surface of the liquid storage tank 1 relative to the oil storage tank, and the other end of the first pipeline 2 is embedded on the side wall of the oil storage tank. And a bidirectional pump 15 is provided on the first pipeline 2, a first solenoid valve 14 is provided on the outer wall of the first pipeline 2, and the first solenoid valve 14 is arranged between the bidirectional pump 15 and the liquid storage tank 1. One end of an oil return assembly is arranged between the bidirectional pump 15 and the first solenoid valve 14, and the other end of the oil return assembly is embedded at the top of the liquid storage tank 1. A dehydration assembly for draining water is embedded on the side wall of the liquid storage tank 1 near the bottom, and an ultrasonic sensing group for detecting the oil level and water level is provided on the side wall of the liquid storage tank 1.

[0034] The bidirectional pump 15 is a bidirectional gear pump. A bidirectional gear pump is a pump that relies on two or more gears sealed in a housing. It transports liquid by the change in the working space volume generated during the meshing process of the gears with each other. It can rotate forward and backward, and the pump shaft can supply oil in the same amount in the same direction when rotating forward and backward.

[0035] The first solenoid valve 14 is a pneumatic control valve. One end of the oil return pipe 3 is embedded and installed on the outer wall of the first pipe 2. One end of the oil return pipe 3 is fixedly installed on the outer wall of the first pipe 2 and is located between the two-way pump 15 and the first solenoid valve 14, so that the oil return pipe 3 is communicated with the inside of the first pipe 2. The other end of the oil return pipe 3 passes through the top of the liquid storage tank 1 and extends into the inner cavity, so as to carry out oil-water separation cyclically. The oil return and water inlet are adjusted by adjusting the gear rotation direction of the same two-way gear pump, so that the two-way pump 15 has a positive pumping force when pumping water into the liquid storage tank 1. When returning oil from the liquid storage tank 1 to the first pipe 2, it is adjusted to a reverse pumping force.

[0036] The other end of the oil return pipe 3 penetrates through the top of the liquid storage tank 1 and extends into the inner cavity. The dehydrating pipe 4 is embedded and installed on the side wall of the liquid storage tank 1 near the bottom, and a second solenoid valve 6 is arranged on the dehydrating pipe 4. The second solenoid valve 6 is also a pneumatic control valve. The first solenoid valve 14 and the second solenoid valve 6 are both connected by dn50 flanges, the air source port is connected by 1 / 4npt thread, and the power supply is DC 4-24V, and the wire interface is connected by 1 / 4npt thread. One end of the dehydrating pipe 4 is fixedly embedded and installed on the side wall of the liquid storage tank 1 and extends to the bottom water storage area. The second solenoid valve 6 is a pneumatic control valve, and the water inside the liquid storage tank 1 is pumped out through the dehydrating pipe 4.

[0037] The side wall of the liquid storage tank 1 is provided with an ultrasonic sensor group for detecting the oil level and water level. Through the set ultrasonic sensor group, the oil level inside the liquid storage tank 1 is detected, and then the oil return operation is carried out through signal transmission. This device is regulated by the configured control cabinet 12. The control cabinet 12 is a 600×300 explosion-proof control cabinet for on-site data processing. The control cabinet 12 supplies power to the on-site equipment. The control cabinet 12 is equipped with a display screen, has a signal remote transmission function, rs485 transmission, and optical fiber data transmission. Through the control cabinet 12, signal transmission and automatic opening and closing are carried out between electronic components, which brings convenience to the operation process of relevant personnel.

[0038] During dehydration processing, first adjust the direction of the two-way pump 15 to be positive. Through the two-way pump 15, the water at the lower part of the oil product storage tank flows from the first pipe 2 into the bottom of the liquid storage tank 1, and through the funnel-shaped bottom of the liquid storage tank 1, solid impurities settle.

[0039] After the water in the oil storage tank flows into the liquid storage tank 1, when the second sensor 8 and the fourth sensor 10 detect that there is water in the storage tank, the second solenoid valve 6 is opened and dehydration operation is carried out through the second pressure pump 13 on the dehydration pipeline 4. As the water level drops. When the first sensor 8 and the third sensor 9 detect that the liquid level is oil, the second solenoid valve 6 is closed and the first pressure pump 17 is automatically turned on. Since the power of the two-way pump 15 is greater than the power of the first pressure pump 17, the oil recovered inside the return oil pipe 3 returns to the inside of the liquid storage tank 1 through the first solenoid valve 14 to continue dehydration. Through cyclic dehydration, the dehydration effect is ensured.

[0040] When there is too much oil inside the liquid storage tank 1 after cyclic dehydration, then adjust the output direction of the two-way pump 15, and close the first solenoid valve 14. At the same time, turn on the first pressure pump 17, so that the oil chemical substances inside the liquid storage tank 1 flow back to the storage tank through the two-way pump 15. Thus, the separated oil is brought back into the oil storage tank, thereby improving the oil recovery rate and avoiding waste. By cooperating with a small liquid storage tank, the dehydration amount can be increased and the efficiency of the dehydration process is improved.

[0041] The oil return assembly of the two-way pump 15 includes a return oil pipe 3 embedded and installed on the top of the liquid storage tank 1 of the two-way pump 15. The other end of the return oil pipe 3 of the two-way pump 15 is embedded and installed on the outer wall of the first pipeline 2 of the two-way pump 15, and the return oil pipe 3 of the two-way pump 15 is located between the two-way pump 15, the two-way pump 15, the two-way pump 15 and the first solenoid valve 14 of the two-way pump 15. A first pressure pump 17 is arranged on the outer wall of the return oil pipe 3 of the two-way pump 15.

[0042] The dehydration assembly of the two-way pump 15 includes a dehydration pipeline 4 embedded and installed on the side wall near the bottom of the liquid storage tank 1 of the two-way pump 15. A second solenoid valve 6 is arranged on the dehydration pipeline 4 of the two-way pump 15. A fifth sensor 11 is arranged on the outer wall of the dehydration pipeline 4 of the two-way pump 15, and a second pressure pump 13 is arranged on the dehydration pipeline 4 of the two-way pump 15.

[0043] Among them, the ultrasonic sensor group includes a first sensor 7, a second sensor 8, a third sensor 9 and a fourth sensor 10 embedded in sequence on the side wall of the liquid storage tank 1, and the first sensor 7, the second sensor 8, the third sensor 9 and the fourth sensor 10 are evenly arranged from top to bottom. The first sensor 7, the second sensor 8, the third sensor 9 and the fourth sensor 10 are all ultrasonic sensors. The first sensor 7 and the third sensor 9 are used to detect the oil level, and the second sensor 8 and the fourth sensor 10 are used to detect the water level.

[0044] Since after the oil and water are stratified, the oil is located on the water surface, the first sensor 7 and the third sensor 9 are respectively located above the second sensor 8 and the fourth sensor 10, thus improving the effect of the dehydration process.

[0045] It should be noted that a coalescing material 16 for oil demulsification is provided on the inner wall of the liquid storage tank 1. The coalescing material 16 can be fiberglass. By capturing water droplets with the fiberglass on the inner wall of the liquid storage tank 1, the coalesced water droplets form large water droplets. Then, through gravity sedimentation, the water is located below the oil, causing the oil to demulsify, and finally forming an oil-water separation layer, thereby improving the oil-water separation effect.

[0046] In addition, the end of the first pipe 2 located in the liquid storage tank 1 is a bent pipe. By setting the bent pipe, the oil separated inside the liquid storage tank 1 cannot flow back.

[0047] In addition, the bottom of the liquid storage tank 1 is in a funnel shape. By forming the funnel-shaped bottom, solid impurities in the water entering the liquid storage tank 1 settle.

[0048] Furthermore, protective shells are provided outside the inner cavity of the liquid storage tank 1 for the first sensor 7, the second sensor 8, the third sensor 9, and the fourth sensor 10. By setting the protective shell inside the liquid storage tank 1, the ultrasonic sensor group is protected from impurity contamination.

[0049] The dehydration pipe 4 is composed of a dn200 pipe and two eccentric reducers, and both the inlet and outlet are dn50. Ensuring the change in the diameter of the dehydration pipe 4 can cause the flow rate of the liquid in the liquid storage tank 1 to change when flowing through the dehydration pipe 4, thereby achieving the effect of concentrating water and collecting sand, and preventing solid impurities from depositing in the pipe and causing blockage.

[0050] The ultrasonic sensor group is powered by DC 4 - 24V and is connected by 1 / 4npt threads.

[0051] A fifth sensor 11 is provided near the water outlet port of the dehydration pipe 4. The fifth sensor 11 is a capacitance sensor, and the fifth sensor 11 is mainly used to ensure that the water coming out of the dehydration pipe 4 does not carry oil. When the fifth sensor 11 detects oil in the water, it will control the second solenoid valve 6 of the valve to close to prevent oil product loss.

[0052] The working principle of the tank root dehydration device of an oil product storage tank in this embodiment is as follows: First, adjust the direction of the two-way pump 15 to the forward direction. Through the two-way pump 15, the water at the lower part of the oil product storage tank flows from the first pipe 2 into the bottom of the liquid storage tank 1. After the water in the oil product storage tank flows into the liquid storage tank 1, when the second sensor 8 and the fourth sensor 10 detect water in the storage tank, the second solenoid valve 6 is opened through the control cabinet 12, and dehydration operation is carried out through the second pressure pump 13 on the dehydration pipe 4.

[0053] As the water level drops, when the first sensor 8 and the third sensor 9 detect that the liquid level is oil, the second solenoid valve 6 closes and the first pressure pump 17 automatically starts. Since the power of the two-way pump 15 is greater than that of the first pressure pump 17, the oil recovered inside the return pipe 3 returns to the liquid storage tank 1 through the first solenoid valve 14 to continue dehydration.

[0054] When there is too much oil in the liquid storage tank 1 after cyclic dehydration, then adjust the output direction of the two-way pump 15, and close the first solenoid valve 14. At the same time, turn on the first pressure pump 17 so that the oil chemical substances in the liquid storage tank 1 flow back to the storage tank through the two-way pump 15.

[0055] Embodiment 2

[0056] Refer to the attached Figure 3 As shown in the figure: In this embodiment, for the root dehydration device of an oil storage tank, the end of the return pipe 3 embedded in the liquid storage tank 1 is externally sleeved with an extension pipe 18. The extension pipe 18 is movably sleeved outside the return pipe 3 through a through hole opened in the center of the inner cavity, so that the extension pipe 18 is movably sleeved outside the return pipe 3. The end of the extension pipe 18 away from the return pipe 3 is externally sleeved with a floating block 19. The floating block 19 is fixedly sleeved outside the lower end of the extension pipe 18 through an installation hole opened on the surface. Sealing limit members for preventing the extension pipe 18 from falling off are provided at the upper end of the extension pipe 18 and the end of the return pipe 3 located inside the liquid storage tank 1. A telescopic pipe fitting is formed by the extension pipe 18 and the return pipe 3. The floating block 19 ensures that the extension pipe 18 is on the oil surface, ensuring the stability of the oil pumping-back process. When the second sensor 8 or the fourth sensor 10 detects the water surface after the oil on the water surface is cleaned, the first pressure pump 17 is turned off. When the oil inside gradually increases and the first sensor 7 or the third sensor 9 detects the oil surface, a signal is transmitted to the first pressure pump 17, and thus oil is pumped back.

Claims

1. A root dehydration device for an oil storage tank, comprising a liquid storage tank (1), characterized in that: A first pipeline (2) is provided between the liquid storage tank (1) and the water storage area of the oil storage tank, and a two-way pump (15) is provided on the first pipeline (2). A first solenoid valve (14) is provided on the outer wall of the first pipeline (2), and the first solenoid valve (14) is arranged between the two-way pump (15) and the liquid storage tank (1). One end of an oil return assembly is arranged between the two-way pump (15) and the first solenoid valve (14), and the other end of the oil return assembly is embedded in the top of the liquid storage tank (1). A dehydration assembly for draining water is embedded in the side wall of the liquid storage tank (1) near the bottom. An ultrasonic sensing group for detecting the oil level and water level is provided on the side wall of the liquid storage tank (1).

2. The root dehydration device for an oil storage tank according to claim 1, characterized in that: The oil return assembly includes an oil return pipe (3) embedded and installed on the top of the liquid storage tank (1). The other end of the oil return pipe (3) is embedded and installed on the outer wall of the first pipeline (2), and the oil return pipe (3) is located between the two-way pump (15) and the first solenoid valve (14). A first pressure pump (17) is provided on the outer wall of the oil return pipe (3).

3. The root dehydration device for an oil storage tank according to claim 1, characterized in that: The dehydration assembly includes a dehydration pipe (4) embedded and installed on the side wall of the liquid storage tank (1) near the bottom. A second solenoid valve (6) is provided on the dehydration pipe (4). A fifth sensor (11) is provided on the outer wall of the dehydration pipe (4), and a second pressure pump (13) is provided on the dehydration pipe (4).

4. The root dehydration device for an oil storage tank according to claim 1, characterized in that: The ultrasonic sensing group includes a first sensor (7), a second sensor (8), a third sensor (9) and a fourth sensor (10) embedded in sequence on the side wall of the liquid storage tank (1), and the first sensor (7), the second sensor (8), the third sensor (9) and the fourth sensor (10) are uniformly arranged from top to bottom.

5. The root dehydration device for an oil storage tank according to claim 1, characterized in that: A coalescing material (16) for oil demulsification is provided on the inner wall of the liquid storage tank (1).

6. The root dehydration device for an oil storage tank according to claim 2, characterized in that: The end of the oil return pipe (3) embedded in the liquid storage tank (1) is a bent pipe.

7. The root dehydration device for an oil storage tank according to claim 1, characterized in that: The bottom of the liquid storage tank (1) is funnel-shaped.

8. The root dehydration device for an oil storage tank according to claim 4, wherein: Protection shells are provided outside the first sensor (7), the second sensor (8), the third sensor (9) and the fourth sensor (10) which are located outside the inner cavity of the liquid storage tank (1).

9. The root dehydration device for an oil storage tank according to claim 3, characterized in that: The dehydration pipe (4) is composed of a dn200 pipe and two eccentric reducers, and both the inlet and outlet are dn50.

10. The root dehydration device for an oil storage tank according to claim 2, characterized in that: An extension pipe (18) is sleeved outside the end of the oil return pipe (3) embedded in the liquid storage tank (1), and a floating block (19) is sleeved outside the end of the extension pipe (18) away from the oil return pipe (3).

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