Inclined tube type water segregator liquid inlet system

Abstract

The utility model relates to the technical field of petroleum treatment, in particular to a liquid inlet system of an inclined tube type water segregator. The inclined tube type water segregator liquid inlet system comprises a pre-heating tank, the pre-heating tank is connected with a rotary centrifugal separator through a heating tank, the rotary centrifugal separator is connected with a water distribution tank through a homogenizing and filtering device, the water distribution tank is connected with an inclined tube type water segregator, and a horn-shaped flow expanding opening and a filter screen are arranged in the homogenizing and filtering device. The preheating tank coil pipe and the water distribution tank coil pipe are connected through a connecting pipeline to form a heat circulation system. And the high-temperature heat conduction liquid in the water distribution tank can transfer heat to the crude oil in the preheating tank through the coil pipe, so that the heat is recycled. When the external temperature is low, the energy consumption of the heating tank is greatly reduced through the heat recycling mode, the crude oil treatment cost is reduced, and the energy utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum processing, in particular to a liquid inlet system of an inclined tube type water distributor. Background Art

[0002] The inclined tube water separator is a key piece of equipment used for oil-water separation in crude oil processing. Based on the theory of shallow sedimentation, it utilizes a series of inclined pipes, exploiting the density difference between oil and water to cause oil droplets to rise upward within the inclined tubes while water settles downward, achieving efficient separation. This device offers high separation efficiency and a compact footprint, making it widely used in the petroleum industry.

[0003] However, the existing inclined tube water separator liquid inlet device has some significant problems. On the one hand, the energy consumption is high. During the crude oil processing process, the crude oil often needs to be heated to reduce its viscosity to facilitate subsequent separation operations. However, when the external temperature is low, the heating tank needs to consume a lot of energy to maintain the heating temperature of the crude oil, which not only increases the production cost, but also causes a huge waste of energy. On the other hand, the existing device has low filtration efficiency. Since the liquid phase has a high flow velocity in the middle and a low flow velocity on both sides during flow, the processing efficiency of different parts of the filter screen is different. The middle flow velocity is fast, and the amount of impurities passing through is large, but the impact force on the filter screen is also large, which can easily cause local blockage of the filter screen; the flow velocity on both sides is slow, the amount of impurities passing through is small, the filtration effect is poor, and the overall filtration efficiency is limited, which affects the separation quality of the crude oil. Utility Model Content

[0004] In response to the shortcomings of the prior art, the present invention provides a tilted-tube manifold inlet system. The preheating tank coils and the water distribution tank coils are connected by connecting pipes, forming a heat circulation system. The high-temperature heat transfer fluid in the water distribution tank transfers heat to the crude oil in the preheating tank via the coils, enabling heat recovery and reuse. When the ambient temperature is low, this heat recycling significantly reduces the energy consumption of the heating tank, lowering crude oil processing costs and improving energy efficiency.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The inclined tube water separator liquid inlet system includes a pre-heating tank, which is connected to the rotary centrifugal separator through a heating tank, and the rotary centrifugal separator is connected to the water distribution tank through a homogenizing filter device. The water distribution tank is connected to the inclined tube water separator, and the homogenizing filter device is provided with a trumpet-shaped expansion port and a filter screen inside the pre-heating tank, and a pre-heating tank coil is provided inside the pre-heating tank, and a water distribution tank coil is provided inside the water distribution tank. The water distribution tank coil is connected to a heat transfer liquid inlet pipe, and the water distribution tank coil is connected to the pre-heating tank coil through a connecting pipe.

[0007] The pre-heating tank is equipped with a pre-heating coil. The coil structure allows for sufficient heat exchange between the heat transfer fluid and the crude oil, achieving initial heating of the crude oil, reducing its viscosity, reducing the load on subsequent heating tanks, and improving energy efficiency.

[0008] A coarse grid is provided between the trumpet-shaped flow expansion port and the filter screen, and an oblique guide vane is provided between the coarse grid and the trumpet-shaped flow expansion port.

[0009] A backwash port is provided inside the homogenizing filter device, a gap wall is provided between the backwash port and the filter screen, and the backwash port is located above the homogenizing filter device.

[0010] The trumpet-shaped expansion port is connected to the feed port of the homogenizing filter device, and the feed port of the homogenizing filter device is connected to the outlet of the rotary centrifugal separator. The homogenizing filter device includes a trumpet-shaped expansion port, oblique guide vanes, a coarse screen and a filter screen, as well as a backwash port and a slit wall. The trumpet-shaped expansion port evenly disperses the liquid phase, the oblique guide vanes guide the liquid to pass evenly through the filter screen, the coarse screen first filters large particles of impurities to protect the filter screen; the backwash port and the slit wall design facilitate regular backwashing of the filter screen, maintain good filtration performance, and effectively improve filtration efficiency. The small mouth of the trumpet-shaped expansion port is connected to the feed port of the homogenizing filter device.

[0011] The preheating tank is connected with a feed pipe, a heating pipe is arranged inside the heating tank, and a tangential feed port is arranged on the vertical wall of the rotary centrifugal separator, and the tangential feed port is connected with the heating tank.

[0012] The working principle of this utility model is:

[0013] Crude oil feed: Crude oil flows into the preheating tank through the feed pipe. The feed rate is set at 50 cubic meters per hour based on the processing capacity of the device to ensure a stable crude oil level in the preheating tank. This flow rate fully utilizes the processing capacity of the equipment while avoiding pressure fluctuations in the tank caused by excessive feeding, which could affect the subsequent heating effect.

[0014] Preheating: A heat transfer fluid maintained at 60-70°C is passed through the coils of the preheating tank to initially heat the crude oil. After approximately 30 minutes of heat exchange, the crude oil temperature rises to approximately 40°C. This temperature increase effectively reduces the crude oil viscosity, reduces the load on the subsequent heating tanks, and creates favorable conditions for subsequent separation operations.

[0015] Further Heating: The pre-heated crude oil enters a heating tank via a pipeline, where heating pipes within the tank provide a secondary heating of the crude oil. The heating temperature is controlled between 70°C and 80°C for 20 minutes. Within this temperature range, the crude oil's fluidity and separation properties reach optimal levels, ensuring efficient subsequent centrifugation and filtration operations.

[0016] Centrifugal Separation: The heated crude oil enters the rotating centrifugal separator through a tangential feed port. The separator's speed is set at 3000 rpm. Under the action of centrifugal force, the oil, water, and impurities are initially separated in approximately 15 minutes. The high-speed rotation quickly sweeps water and heavy impurities from the crude oil to the edges of the separator, while the light crude oil concentrates in the center, achieving a significant separation effect.

[0017] Homogenizing Filtration: Crude oil discharged from the rotary centrifugal separator enters the homogenizing filtration unit. It is first evenly dispersed through the trumpet-shaped diffuser before being filtered sequentially through the inclined guide vanes, coarse screen, and filter screen. The filter screen is backwashed every two hours through the backwash port at a pressure of 0.5 MPa for 10 minutes. This backwash frequency and pressure setting effectively remove impurities from the filter screen and ensure stable filtration performance.

[0018] Water distribution and final heating: The filtered crude oil flows into the water distribution tank, where a heat transfer fluid at 80°C-90°C flows through the coils to heat the crude oil again, stabilizing it at around 75°C. The crude oil remains in the water distribution tank for approximately 20 minutes to ensure a uniform temperature and prepare for entry into the inclined tube water distributor.

[0019] Entering the inclined tube water separator: After being treated in the water distribution tank, the crude oil enters the inclined tube water separator. The crude oil flow rate entering the inclined tube water separator is controlled at 40 cubic meters per hour and a flow rate of 0.05 meters per second. Under these flow and velocity conditions, the crude oil is efficiently separated in the inclined tube by fully utilizing the density difference between oil and water. The separated water and oil are discharged from their corresponding outlets.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The preheating tank coil and the water distribution tank coil are connected by connecting pipes to form a heat circulation system. The high-temperature heat transfer fluid in the water distribution tank transfers heat to the crude oil in the preheating tank through the coil, realizing heat recovery and reuse. When the external temperature is low, this heat recycling method significantly reduces the energy consumption of the heating tank, reduces the cost of crude oil processing, and improves energy utilization.

[0022] (2) The unique internal structural design of the homogenizing filter effectively improves the filtration effect. The trumpet-shaped expansion port makes the incoming liquid phase flow rate evenly distributed, reducing the problem of uneven filtration caused by flow rate differences. The synergistic effect of the coarse screen, the oblique guide vanes and the filter screen allows the coarse screen to intercept large particles of impurities first, and the oblique guide vanes guide the liquid phase to pass through the filter screen evenly, avoiding the impact of excessive intermediate flow rate on the filter screen, extending the service life of the filter screen, and improving the overall filtration efficiency, ensuring that the impurity content of the crude oil entering the oblique tube water separator is lower, thereby improving the quality of oil-water separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the liquid inlet system of the inclined tube water distributor of the utility model;

[0024] Figure 2 This is a top view of the homogenizing filter device of the utility model;

[0025] In the figure: 1. Oblique tube water distributor; 2. Preheating tank; 3. Heating tank; 4. Rotary centrifugal separator; 5. Homogenizing filter; 6. Water distribution tank; 7. Feed pipe; 8. Preheating tank coil; 9. Heating pipe; 10. Tangential feed port; 11. Homogenizing filter feed port; 12. Trumpet-shaped expansion port; 13. Oblique guide vane; 14. Coarse screen; 15. Filter screen; 16. Slit wall; 17. Backwash port; 18. Water distribution tank coil; 19. Heat transfer fluid inlet pipe; 20. Connecting pipe. DETAILED DESCRIPTION

[0026] In order to make the purpose and technical solution of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] like Figure 1 As shown, the liquid inlet system of the inclined tube water separator includes a preheating tank 2, which is connected to the rotary centrifugal separator 4 through the heating tank 3. The rotary centrifugal separator 4 is connected to the water distribution tank 6 through the homogenizing filter 5. The water distribution tank 6 is connected to the inclined tube water separator 1. The homogenizing filter 5 is provided with a trumpet-shaped expansion port 12 and a filter screen 15. The preheating tank 2 is provided with a preheating tank coil 8. The water distribution tank 6 is provided with a water distribution tank coil 18. The water distribution tank coil 18 is connected to a heat transfer liquid inlet pipe 19. The water distribution tank coil 18 is connected to the preheating tank coil 8 through a connecting pipe 20. Figure 2 As shown, a coarse screen 14 is provided between the trumpet-shaped expansion port 12 and the filter screen 15, and an oblique guide vane 13 is provided between the coarse screen 14 and the trumpet-shaped expansion port 12. A backwash port 17 is provided inside the homogeneous filter device 5, and a slit wall 16 is provided between the backwash port 17 and the filter screen 15. The backwash port 17 is located above the homogeneous filter device 5. The trumpet-shaped expansion port 12 is connected to the homogeneous filter device feed port 11, which is connected to the outlet of the rotating centrifugal separator 4. A feed pipe 7 is connected to the preheating tank 2, a heating pipe 9 is provided inside the heating tank 3, and a tangential feed port 10 is provided on the vertical wall of the rotating centrifugal separator 4, which is connected to the heating tank 3. The tangential feed causes the crude oil to form a high-speed rotating flow field in the separator, using centrifugal force to achieve efficient separation of oil, water and impurities. The structure is simple and the separation effect is significant.

[0029] The above-mentioned inclined tube type water distributor liquid inlet system, when in operation, comprises the following steps:

[0030] (1) The crude oil flows into the preheating tank 2 through the feed pipe 7. A heat transfer fluid with a temperature of 60-70°C is introduced into the preheating tank coil 8 to preliminarily heat the crude oil. After about 30 minutes of heat exchange, the crude oil temperature rises to about 40°C. The preheated crude oil enters the heating tank 3 through the pipeline. The heating pipe 9 in the heating tank 3 reheats the crude oil. (2) The heated crude oil enters the rotary centrifugal separator 4 through the tangential feed port 10. The speed of the separator is set at 3000 rpm. Under the action of centrifugal force, the oil, water and impurities are preliminarily separated in about 15 minutes. The crude oil discharged from the rotary centrifugal separator 4 enters the homogenizing filter 5. The crude oil is first evenly dispersed through the trumpet-shaped expansion port 12, and then filtered through the oblique guide vanes 13, the coarse screen 14 and the filter 15 in sequence. The filter 15 is backwashed once every 2 hours through the backwash port 17. (3) The filtered crude oil flows into the water distribution tank 6. The water distribution tank coil 18 is fed with a heat transfer fluid at a temperature of 80-90°C to heat the crude oil again, stabilizing its temperature at around 75°C. The crude oil stays in the water distribution tank 6 for about 20 minutes. After being treated in the water distribution tank 6, the crude oil enters the inclined tube water separator 1.

Claims

1. An inclined tube water distributor liquid inlet system, characterized in that: The invention comprises a preheating tank (2), wherein the preheating tank (2) is connected to a rotary centrifugal separator (4) via a heating tank (3), the rotary centrifugal separator (4) is connected to a water distribution tank (6) via a homogenizing filter device (5), the water distribution tank (6) is connected to an inclined tube type water distributor (1), a trumpet-shaped expansion port (12) and a filter screen (15) are provided inside the homogenizing filter device (5), a preheating tank coil (8) is provided inside the preheating tank (2), a water distribution tank coil (18) is provided inside the water distribution tank (6), a heat transfer liquid inlet pipe (19) is connected to the water distribution tank coil (18), and the water distribution tank coil (18) is connected to the preheating tank coil (8) via a connecting pipe (20).

2. The inclined tube type water distributor liquid inlet system according to claim 1, characterized in that: A coarse grid (14) is provided between the trumpet-shaped flow expansion port (12) and the filter screen (15), and an oblique guide vane (13) is provided between the coarse grid (14) and the trumpet-shaped flow expansion port (12).

3. The inclined tube type water distributor liquid inlet system according to claim 1, characterized in that: A backwash port (17) is provided inside the homogenizing filter device (5), a gap wall (16) is provided between the backwash port (17) and the filter screen (15), and the backwash port (17) is located above the homogenizing filter device (5).

4. The inclined tube type water distributor liquid inlet system according to claim 1, characterized in that: The trumpet-shaped expansion port (12) is connected to the feed port (11) of the homogenizing filter device, and the feed port (11) of the homogenizing filter device is connected to the outlet of the rotary centrifugal separator (4).

5. The inclined tube type water distributor liquid inlet system according to claim 1, characterized in that: The preheating tank (2) is connected to a feed pipe (7), a heating pipe (9) is provided inside the heating tank (3), and a tangential feed port (10) is provided on the vertical wall of the rotary centrifugal separator (4), and the tangential feed port (10) is connected to the heating tank (3).

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