Oil-water separator and use method thereof

Abstract

The invention discloses an oil-water separator and a use method thereof, and relates to the technical field of recovery and purification. The oil-water separator comprises a separator main body, a fixed flange, a movable flange, a connecting pipeline and a conveying pipeline, and a water outlet is formed in the side wall of the separator main body and used for discharging a separated water phase; the fixed flange is fixedly mounted at the water outlet of the separator main body and is communicated with the interior of the separator main body; the movable flange is detachably connected to the outer side of the fixed flange; the first end of the connecting pipeline is connected with the movable flange; the conveying pipeline is connected with the second end of the connecting pipeline, the second end of the connecting pipeline is located above the conveying pipeline, and the second end of the connecting pipeline and the first end of the connecting pipeline are located at the same horizontal position or located above the first end of the connecting pipeline; and a plurality of mounting holes are formed in the fixed flange and correspond to different mounting positions of the movable flange, so that the height of the second end of the connecting pipeline is adjusted. It can be ensured that the water phase can be stably discharged and does not carry the oil phase.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of recovery and purification, and in particular to an oil-water separator and a use method thereof. BACKGROUND

[0002] In the coking plant coal gas recovery and purification process, the crude benzene oil-water separator is one of the key devices to ensure the quality of crude benzene product and the stable operation of the system. Its main function is to use the density difference between crude benzene and water to realize two-phase separation through the principle of gravity settling, effectively remove the water entrained in the crude benzene obtained after the benzene washing and removal process, so as to provide qualified raw materials for subsequent refining processing, and prevent water from causing corrosion or freezing of downstream equipment and pipelines and other hazards.

[0003] At present, the widely used crude benzene oil-water separator generally uses an inverted U-shaped pipeline to lead water out of the separator, and the position of the water outlet of the separator is at the highest point of the inverted U-shaped pipeline. The water outlet is usually connected by a fixed flange structure, and the position of the water outlet of the separator is fixed after the installation of the equipment. However, in the actual continuous production process, this fixed design has obvious limitations. Due to the fluctuation of raw material coal quality, the change of washing oil quality, the fluctuation of operating temperature, and the seasonal difference of air temperature, the composition and density of crude benzene will change dynamically. At the same time, the rise and fall of the external environment temperature will also change the physical property parameters of the oil-water two phases, and then cause the frequent fluctuation of the oil-water interface position. Since the position of the water outlet is fixed, it cannot adapt to the change of the interface, which eventually leads to incomplete separation of water. When the highest point of the inverted U-shaped pipeline is higher than the oil-water interface, the crude benzene flows out of the water outlet along the inverted U-shaped pipeline, causing suction effect, intensifying disturbance, forming an oil-water emulsion layer, and the incompletely separated water mixes into the crude benzene, which may cause the blockage of the light benzene pipeline in the subsequent processing process, affecting the continuity of production and the quality of products. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide an oil-water separator and a use method thereof, which can ensure that the water phase can be stably discharged without entraining the oil phase, and avoid the mixing of incompletely separated water into the crude benzene, which may cause the blockage of the light benzene pipeline in the subsequent processing process, affecting the continuity of production and the quality of products.

[0005] To solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0006] The first aspect of the present application provides an oil-water separator, comprising:

[0007] A separator body, a side wall of the separator body is provided with a water outlet for discharging the separated water phase;

[0008] A fixed flange, the fixed flange is fixedly installed at the water outlet of the separator body and is in communication with the inside of the separator body;

[0009] A movable flange is detachably connected to the outside of the fixed flange;

[0010] Connect the pipe, with the first end of the pipe connected to the movable flange;

[0011] The conveying pipeline connects to the second end of the connecting pipeline. The second end of the connecting pipeline is located above the conveying pipeline. The second end of the connecting pipeline is at the same horizontal level as the first end of the connecting pipeline or is located above the first end of the connecting pipeline.

[0012] The fixed flange has multiple mounting holes, corresponding to different installation positions of the movable flange, thereby adjusting the height of the second end of the connecting pipe.

[0013] In some modified embodiments of the first aspect of this application, the first part of the mounting hole corresponds to the first mounting position of the movable flange; the second part of the mounting hole corresponds to the second mounting position of the movable flange, and the second part of the mounting hole and the first part of the mounting hole are spaced apart by a set angle.

[0014] In some modified embodiments of the first aspect of this application, the first portion of the mounting holes and the second portion of the mounting holes are evenly distributed along the circumference of the fixed flange.

[0015] Some modified embodiments of the first aspect of this application also include:

[0016] A density sensor, located inside the separator body, is used to detect the density of the target liquid.

[0017] Some modified embodiments of the first aspect of this application also include:

[0018] The controller can be connected to the density sensor to receive signals emitted by the density sensor.

[0019] Some modified embodiments of the first aspect of this application also include:

[0020] The temperature sensor is located on the top of the separator body and is connected to the controller.

[0021] Some modified embodiments of the first aspect of this application also include:

[0022] An endoscope, mounted on the separator body, is used to observe the oil-water separation interface.

[0023] In some modified embodiments of the first aspect of this application, the delivery pipe is movably connected to the second end of the connecting pipe.

[0024] Some modified embodiments of the first aspect of this application also include:

[0025] The sealing gasket is clamped between the fixed flange and the movable flange.

[0026] The second aspect of the present application provides a method for using the oil-water separator, comprising the following steps:

[0027] Obtaining or calculating the oil-water interface position information in the separator body;

[0028] According to the oil-water interface position information, the target height is determined;

[0029] The operator selects the installation hole of the corresponding height on the fixed flange according to the target height, disassembles and reassembles the movable flange to the target position, so that the second end of the connecting pipeline is located below the oil-water interface, and it is ensured that the water phase can be stably discharged without entraining the oil phase.

[0030] Compared with the prior art, the oil-water separator provided by the first aspect of the present application is provided with a plurality of installation holes corresponding to different installation positions of the movable flange along the height direction of the separator body on the fixed flange, so that the movable flange can be installed at different positions of the fixed flange, and then the second end of the connecting pipeline can be adjusted at a plurality of positions in the height direction, so that the vertex of the inverted U-shaped pipeline (the inverted U-shaped pipeline is composed of the inner pipeline, the connecting pipeline and the conveying pipeline) can be adjusted according to the oil-water separation interface, so that the top of the inverted U-shaped pipeline is always located at a suitable position below the oil-water separation interface, ensuring that the water phase can be stably discharged without entraining the oil phase; and avoiding that the crude benzene enters the inverted U-shaped pipeline to form a suction effect and intensify the disturbance, so that the water that is not completely separated is mixed into the crude benzene, thereby avoiding the blockage of the light benzene pipeline in the subsequent processing process, affecting the continuity of production and the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like or corresponding elements refer to like or corresponding parts throughout the several drawings, in which:

[0032] Figure 1 A structural schematic diagram of a separator is schematically shown;

[0033] Figure 2 A structural schematic diagram of a movable flange of a separator is schematically shown;

[0034] Figure 3 A structural schematic diagram of a fixed flange of a separator is schematically shown;

[0035] Figure 4 A partial side view structural schematic diagram of a separator is schematically shown;

[0036] Figure 5 A partial side view schematic diagram of another installation position of the separator is shown schematically.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] 1. separator body; 2. movable flange; 3. water outlet; 4. connecting hole; 5. positioning pin; 6. temperature sensor; 7. density sensor; 8. fixed flange; 81. mounting hole; 9. connecting pipeline; 10. conveying pipeline; 11. internal pipeline. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present application will be described in greater detail below, with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms without being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0040] It should be noted that unless otherwise specified, technical or scientific terms used in the present application should be understood as having the common meaning understood by one of ordinary skill in the art to which the present disclosure pertains.

[0041] In the coking plant coal gas recovery and purification process, the crude benzene oil-water separator is one of the key equipment to ensure the quality of crude benzene product and stable operation of the system. Its main function is to use the density difference between crude benzene and water to realize two-phase separation through gravity settling principle, effectively remove the water entrained in the crude benzene obtained after the washing and debenzene process, so as to provide qualified raw materials for subsequent refining processing, and prevent water from causing corrosion or freezing blockage and other hazards to downstream equipment and pipelines.

[0042] The widely used crude benzene oil-water separator generally discharges water from the separator through an inverted U-shaped pipeline. The water outlet of the separator is located at the highest point of the inverted U-shaped pipeline. The water outlet is usually connected by a fixed flange structure. The position of the water outlet of the separator is fixed after the installation of the equipment. However, in the actual continuous production process, this fixed design has obvious limitations. Due to the fluctuation of raw material coal quality, the change of washing oil quality, the fluctuation of operating temperature, and the seasonal difference of air temperature, the components and density of crude benzene will change dynamically. At the same time, the rise and fall of the external environment temperature will also change the physical property parameters of the oil-water two-phase, thereby causing the frequent fluctuation of the oil-water interface position. The fixed position of the water outlet of the separator cannot adapt to the change of the interface, which eventually leads to the incomplete separation of water. When the highest point of the inverted U-shaped pipeline is higher than the oil-water interface, the crude benzene flows out from the water outlet along the inverted U-shaped pipeline. In order to maintain the oil level, the operator may reduce the oil discharge or misjudge the interface, which leads to the entrainment of water droplets that are not separated in the oil phase. (The operator finds that the oil product is lost, and in order to "maintain the oil layer", the operator reduces or stops discharging oil. It is mistakenly believed that "the thinning of the oil layer is a normal phenomenon". However, the feed continues to enter, and new crude benzene containing water continues to enter. Due to the reduction or absence of oil discharge, the total amount of oil phase continues to accumulate, but the new feed contains water, which cannot be discharged in time. The water droplets are suspended and gathered in the oil layer to form an emulsion layer and free water droplets. The oil layer seems to "thicken", but in fact the water content is increasing.) Or because the crude benzene enters the inverted U-shaped pipeline to produce a suction effect, the disturbance is intensified to form an oil-water emulsion layer. (After the crude benzene enters the inverted U-shaped drainage pipe, the flow of the water stream will drive the flow of the crude benzene to produce "entrainment" and "shear" effects. This flow disturbance will intensify the mixing of oil and water and promote the formation of an emulsion layer.) The water that is not completely separated may be mixed into the crude benzene, which may cause the blockage of the light benzene pipeline in the subsequent processing process, affecting the continuity of production and the quality of products.

[0043] To solve the above technical problems, the present application provides an oil-water separator and a use method thereof, which can ensure that the water phase can be stably discharged without entraining the oil phase, and avoid mixing the water that is not completely separated into the crude benzene, which may cause the blockage of the light benzene pipeline in the subsequent processing process, affecting the continuity of production and the quality of products.

[0044] As Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, an oil-water separator includes a separator body 1, a fixed flange 8, a movable flange 2, a connecting pipe 9 and a conveying pipe 10. The side wall of the separator body 1 is provided with a water outlet 3 for discharging the separated water phase. The fixed flange 8 is fixedly installed at the water outlet 3 of the separator body 1 and communicates with the inside of the separator body 1. The movable flange 2 is detachably connected to the outside of the fixed flange 8. The first end of the connecting pipe 9 is connected to the movable flange 2. The conveying pipe 10 is connected to the second end of the connecting pipe 9. The second end of the connecting pipe 9 is located above the conveying pipe 10. The second end of the connecting pipe 9 is at the same horizontal position as the first end of the connecting pipe 9 or is located above the first end of the connecting pipe 9. A plurality of mounting holes 81 are provided on the fixed flange 8, corresponding to different mounting positions of the movable flange 2, so as to adjust the height of the second end of the connecting pipe 9.

[0045] The separator body 1 is a closed container for containing the mixture of crude benzene and water. The oil-water two-phase density difference is used to realize the separation under the action of gravity. The side wall is provided with a water outlet 3. The bottom can be provided with a sewage outlet. The top is provided with a gas balance port or a pressure release device. The separator body 1 can provide sufficient residence time for oil-water static stratification. An observation sight glass or liquid level meter interface can be provided to facilitate monitoring of the oil-water interface and to withstand the operating pressure and temperature in the system. The separator body 1 can be a vertical cylindrical or horizontal elliptical head container. The internal part can be provided with baffles, inclined plate coalescing elements or filler layers to enhance the separation efficiency.

[0046] The fixed flange 8 is a flange component fixedly welded or bolted to the water outlet 3 of the separator body 1. A plurality of mounting holes 81 are provided on the fixed flange 8 in the height direction for cooperation with the movable flange 2 to realize adjustable connection. As an interface base for connecting external pipeline systems, it provides multiple height position connection points to realize outlet height adjustment and ensures sealing to prevent leakage.

[0047] As shown in Figure 2 The movable flange 2 is a flange component detachably connected to the outside of the fixed flange 8. By combining the different mounting holes 81 of the fixed flange 8 with bolts or positioning pins 5, the mounting position of the movable flange 2 in the height direction is changed, thereby adjusting the outlet height of the subsequent pipeline. The movable flange 2 can realize height adjustment of the water outlet pipeline connection point, which is convenient for on-site maintenance and working condition adjustment, and forms a sealed connection with the fixed flange 8. The movable flange 2 can be provided with a short pipe section (referred to as a "live joint") for easy connection. The movable flange 2 can be designed as a rotary movable flange 2: the flange plate can rotate around the center to cooperate with the arc-shaped connecting holes 4 to realize continuous angle adjustment; or as a lifting movable flange 2: height adjustment is realized through the upper and lower sliding groove structure and then locked.

[0048] The connecting pipe 9 is a middle transition pipe connecting the movable flange 2 at one end and the conveying pipe 10 at the other end, and its shape and length determine the height of the vertex of the inverted U-shaped drainage path. The connecting pipe 9 is part of the inverted U-shaped drainage structure and transmits the water phase fluid to the conveying pipe 10; the outlet height of the connecting pipe 9 is adjusted according to the position of the movable flange 2. The connecting pipe 9 can be a combination of a straight pipe and an elbow (such as a 90° elbow and a vertical section), a prefabricated L-shaped or U-shaped short pipe, which is convenient for quick replacement of different height specifications. The connecting pipe 9 can also be provided with a transparent section (such as a viewing cup) for observing the water flow state.

[0049] The conveying pipe 10 receives the water phase discharged from the connecting pipe 9 and conveys it to the final discharge pipe of the sewage collection system or neutralization tank. The inlet of the conveying pipe 10 is located below the second end of the connecting pipe 9, forming a liquid seal structure. The main function is to collect and guide the separated water phase, and the outlet of the connecting pipe 9 forms a water seal structure to prevent gas or crude benzene vapor from escaping along the drainage pipe. The conveying pipe 10 can be a carbon steel pipeline laid directly or overhead; it can also be provided with an emptying valve, a flushing port and other auxiliary facilities.

[0050] The separator body 1 is provided with an internal pipe 11, which is in communication with the water outlet 3 and forms an inverted U-shaped or inverted U-shaped pipe with the connecting pipe 9 and the conveying pipe 10. The internal pipe 11 refers to a fixed pipe extending downward to the water phase area at the other end. It serves as the starting section of the inverted U-shaped drainage path and, together with the external connecting pipe 9 and the conveying pipe 10, forms a complete inverted U-shaped or inverted U-shaped liquid seal drainage system. The internal pipe 11 forms the rising section of the inverted U-shaped path and, together with the external pipe, forms a "first up and then down" flow path, preventing gas short circuiting and escaping. The internal pipe 11 can guide the water phase into the outlet system and guide the bottom water phase from the inside of the separator to the outside adjustment structure. The internal pipe 11 can also cooperate with the liquid seal design and form a two-stage liquid seal with the submerged outlet at the end of the conveying pipe 10 to ensure the gas tightness of the system. The internal pipe 11 can also reduce disturbance, and the pipe opening position is lower than the oil-water interface to avoid direct impact on the oil phase.

[0051] Compared with the prior art, the oil-water separator provided by the first aspect of the present application is provided with a plurality of mounting holes 81 corresponding to different mounting positions of the movable flange 2 in the height direction of the separator body 1 on the fixed flange 8, so that the movable flange 2 can be mounted at different positions of the fixed flange 8, and then the second end of the connecting pipeline 9 can be adjusted at a plurality of positions in the height direction, so that the vertex of the inverted U-shaped pipeline (composed of the inner pipeline 11, the connecting pipeline 9 and the conveying pipeline 10) can be adjusted according to the oil-water separation interface, so that the top of the inverted U-shaped pipeline is always located at a suitable position below the oil-water separation interface, ensuring that the water phase can be stably discharged without entraining the oil phase; and avoiding that the crude benzene enters the inverted U-shaped pipeline to form a suction effect and intensify disturbance, so that the water that is not completely separated is mixed into the crude benzene, thereby avoiding that the light benzene pipeline is blocked in the subsequent processing process, affecting the continuity of production and the quality of products. The layers cause emulsification.

[0052] As shown in Figure 1 , Figure 3 , Figure 4 and Figure 5 , in some modified embodiments of the first aspect of the present application, the first part mounting hole 81 corresponds to the first mounting position of the movable flange 2; the second part mounting hole 81 corresponds to the second mounting position of the movable flange 2, and the second part mounting hole 81 and the first part mounting hole 81 are spaced apart by a certain angle.

[0053] In the traditional height-adjustable design, the mounting holes 81 are usually linearly arranged in the vertical direction, and the up-down adjustment of the movable flange 2 is realized by replacing the bolt hole positions of different heights. However, in some coking plant sites, due to space layout restrictions, complex pipeline routes or maintenance inconvenience, the vertical multi-hole arrangement may be difficult to implement. Therefore, the present application provides an alternative solution of angularly spaced mounting holes 81, which divides the mounting holes 81 on the fixed flange 8 into the first part mounting hole 81 and the second part mounting hole 81, which are spaced apart by a certain angle (such as 30°, 60°, etc.) in the circumferential direction, by rotating the movable flange 2 to different angular positions, the spatial orientation and outlet height of the connecting pipeline 9 are changed, thereby realizing the adjustment of the height of the vertex of the inverted U-shaped pipeline.

[0054] The first part mounting hole 81 is a group of bolt holes provided on the fixed flange 8, used for mounting the movable flange 2 at the first mounting position; when the movable flange 2 is connected with the fixed flange 8 through the group of holes, the second end of the connecting pipeline 9 is in a first height or angle state;

[0055] The first part mounting hole 81 can be uniformly distributed on a certain circumferential line of the fixed flange 8, and the number can be 2-6, forming an installation angle position.

[0056] The second part mounting hole 81 is another set of bolt holes provided on the fixed flange 8, which is spaced apart from the first part mounting hole 81 by a certain angle in the circumferential direction; for mounting the movable flange 2 in the second mounting position, so that the outlet of the connecting pipe 9 obtains different height or inclination angle. When the movable flange 2 is connected to the fixed flange 8 through the first part mounting hole 81 and the second part mounting hole 81 respectively: the spatial posture of the movable flange 2 changes (rotates by a certain angle); resulting in the change of the height of the outlet end of the connecting pipe 9 connected thereto; in turn changing the height of the vertex of the inverted U-shaped path composed of the inner pipe 11→ the connecting pipe 9→ the delivery pipe 10; realizing the adaptive matching of the oil-water separation interface. For example, 12 mounting holes 81 can be provided on the circumference of the fixed flange 8, and the mounting holes 81 are spaced apart by 30 degrees, of which 6 mounting holes 81 spaced apart by 60 degrees are the first part mounting hole 81, and the remaining mounting holes 81 are the second part mounting hole 81, which can adjust the mounting position every 30 degrees to improve the adjustment range.

[0057] As shown in Figure 3 some modified embodiments of the present application, the first part mounting hole 81 and the second part mounting hole 81 are uniformly distributed along the circumference of the fixed flange 8. Uniformly distributing the first part mounting hole 81 and the second part mounting hole 81 along the circumference of the fixed flange 8 means that multiple groups of mounting positions are arranged symmetrically and equidistantly in the circumferential direction, thereby realizing multiple switchable mounting angles; the movable flange 2 can select different connection postures by rotating; under the premise of not changing the overall structure of the flange, realizing the step adjustment of the outlet height or inclination angle of the connecting pipe 9. Uniformly distributing means that the first part mounting hole 81 and the second part mounting hole 81 are arranged at equal central angles on the bolt hole circumference of the fixed flange 8, forming a symmetrical or staggered distribution pattern. For example, as described above, 12 mounting holes 81 can be uniformly distributed on the circumference of the fixed flange 8.

[0058] In use, the operator determines the required outlet 3 height according to the current oil-water interface position; loosens the bolts, removes the movable flange 2 from the current hole group; after rotating by a certain angle, uses another group or the same group of mounting holes 81 or re-tightens; the outlet end height of the connecting pipe 9 changes as the connecting pipe 9 changes the inclination direction, and the vertex position of the inverted U-shaped drainage path adjusts accordingly to match the new oil-water interface.

[0059] As shown in Figure 3 some modified embodiments of the present application, a density sensor 7 is further included, which is arranged in the separator main body 1 and used for detecting the density of the target liquid.

[0060] In the coking plant crude benzene recovery system, the density difference of oil and water phases is the basis for realizing gravity separation. However, due to factors such as raw material coal quality fluctuation, washing oil aging, operation temperature change, etc., the density of the crude benzene and water mixed liquid will dynamically change, and then the oil-water interface position will frequently drift. The traditional equipment relies on manual experience to judge the interface position, and the adjustment lag is large and the error is large. Therefore, in some changed embodiments, a density sensor 7 is introduced to realize real-time online monitoring of the liquid density inside the separator, and to provide data support for judging the oil-water interface and guiding the liquid discharge operation or automatically adjusting the water outlet height.

[0061] The density sensor 7 is an instrument for measuring the mass density of a fluid, which is installed inside or on the side wall of the separator main body 1 in an inserted manner, can detect the density value of the liquid at the position in real time, and output standard signals (such as 4-20mA, RS485, etc.). The density sensor 7 can judge whether the current measurement point is an oil phase (low density, 850-900 kg / m 3 ), a water phase (high density, 1000 kg / m 3 ) or an emulsion layer (intermediate value); it can also assist in positioning the oil-water interface, infer the approximate position of the interface in combination with multi-point arrangement or historical data, and the abnormal fluctuation of density can prompt that the emulsification is serious, the feed is abnormal or the equipment is malfunctioning.

[0062] The sensor can be installed at the estimated oil-water interface area (such as at a position of 50%-70% of the container height), which is low in cost and suitable for working conditions with little interface fluctuation. Two to three density sensors 7 (upper, middle and lower) are vertically distributed at different heights, which can accurately judge the interface position and the thickness of the emulsion layer. The inserted probe is inserted into the inside of the separator through a flange interface, the probe contacts the liquid, and the installation is convenient and the maintenance is simple. The density sensor 7 can be installed in the middle and upper part of the separator, and a high-precision industrial type is adopted, with an accuracy of ±0.005 g / cm 3 . The sensing part is immersed in the crude benzene to detect the density change in real time and transmit the signal to the controller. Through the two sensors, the real-time monitoring of the crude benzene density and the external air temperature is realized to provide data support for height adjustment.

[0063] Data acquisition: the density sensor 7 collects the liquid density at a certain point in the separator in real time, and transmits the density value to the control system; for example, if the density <920 kg / m 3 , it is judged as an oil phase, if the density >980 kg / m 3 , it is judged as a water phase; if the density is between 920-980 kg / m 3 , it may be an emulsion layer or an interface transition zone; adjustment decision: if the density near the water outlet 3 is low (containing oil) → it is prompted that the water outlet 3 height needs to be lowered; if the density in the oil phase is high (containing water) → it is prompted that the water outlet 3 height needs to be increased or the drainage needs to be strengthened; the density sensor 7 can also trigger an alarm to remind the operator to adjust the movable flange 2.

[0064] In some modified embodiments of the present application, a controller is further included, which can be connected with the density sensor 7 for receiving the signals sent by the density sensor 7. On the basis of the aforementioned “density sensor 7 real-time monitoring of liquid density”, the controller is introduced to realize the receiving, analysis and response decision of the sensing data, forming a closed-loop logic of “perception → judgment → regulation”. This lays a foundation for subsequent automatic alarm, operation prompt and even full-automatic adjustment.

[0065] The controller refers to an electronic control unit for receiving the output signals of the density sensor 7 and processing and responding according to the preset logic. It can be a small independent industrial control module, or can be integrated in a PLC (Programmable Logic Controller) or DCS (Distributed Control System) system. For example, the controller can receive analog signals (such as 4-20 mA) or digital signals from the density sensor 7 to judge the current liquid phase (oil / water / emulsion layer), identify abnormal fluctuations in density, infer the trend of change in the oil-water interface position in combination with historical data or set threshold values, and generate alarm signals and display prompt information. It can also record operation data to support fault tracing and process optimization. The controller can use the original or newly added control system to receive signals from the temperature and density sensors 7, convert and analyze the data. Its preset algorithm is based on the correlation between the density characteristics of crude benzene and temperature changes, and it calculates the change in the interface position between crude benzene and separated water in real time to determine the height of the water outlet 3 that needs to be adjusted. The controller connects the operation terminal through wired / wireless communication and sends precise adjustment instructions. After receiving the instructions, the operator adjusts the height accordingly to achieve automatic and precise control.

[0066] As shown in Figure 1 In some modified embodiments of the present application, a temperature sensor 6 is further included, which is arranged at the top of the separator body 1 and connected with the controller. The temperature sensor 6 can be installed at the top of the oil-water separator shell, using a high-precision industrial sensor with an accuracy of ±0.5℃, and the probe contacts the air to sense the air temperature changes in real time and transmit signals to the controller. The temperature sensor 6 is an instrument for measuring the temperature of a medium, which is installed at the top of the separator body 1 to detect the air temperature in real time and transmit signals to the controller. In combination with the density data, it comprehensively judges whether the water outlet height needs to be adjusted or auxiliary measures need to be started; that is, temperature drop → viscosity rise → possible water entrainment; temperature rise → intensified volatilization → safety risk.

[0067] In some modified embodiments of the present application, an endoscope is further included, which is arranged on the separator body 1 for observing the oil-water separation interface.

[0068] In the oil-water separation process, the position of the oil-water interface is the core parameter that determines the purity of the drainage and the recovery rate of crude benzene. However, since the separator is a closed container, it is difficult for the traditional equipment to directly observe the internal state, and the operator relies on experience or indirect signals for adjustment, which has a lag and a risk of misjudgment. Therefore, in some modified embodiments of the present application, an endoscope (also known as "observation mirror" or "viewing mirror") is introduced, which is installed at an appropriate height area on the side wall of the separator main body 1, so that the operator can directly and real-time observe the stratification of the oil-water two-phase and the interface position, providing a direct basis for adjusting the outlet height of the connecting pipeline 9.

[0069] The endoscope refers to a transparent observation device installed on the side wall of a pressure vessel or pipeline, which is composed of pressure-resistant glass (such as borosilicate glass), metal pressure ring, sealing gasket and protective cover, and is used to directly observe the internal medium state without opening the equipment. The endoscope can be arranged within the estimated fluctuation range of the oil-water interface (such as 40% to 70% of the height of the container); the endoscope can be arranged at a single point, or multiple viewing mirrors can be arranged from top to bottom to form an "observation window belt", which is convenient for judging the interface range; the endoscope can be welded or bolted to the side wall of the separator through a flange interface (such as the standard mirror flange of HG / T 21505).

[0070] In some modified embodiments of the present application, the conveying pipeline 10 is movably connected with the second end of the connecting pipeline 9. The second end of the connecting pipeline 9 is a key position for adjusting the height of the top point of the inverted U-shaped path. The "movable flange 2" has been used to realize the adjustable connection between the connecting pipeline 9 and the fixed flange 8. The modified embodiment further designs the movable connection between the conveying pipeline 10 and the second end of the connecting pipeline 9, which means that the conveying pipeline 10 can freely swing or rotate within a certain range; it is convenient for installation and docking in the field where the space is limited or the pipeline layout is complex; it reduces the stress concentration caused by thermal expansion and contraction, vibration or foundation settlement; it supports quick disassembly and maintenance, and improves the maintainability of the system. The movable connection refers to the connection between the conveying pipeline 10 and the second end of the connecting pipeline 9, which allows relative movement, can freely adjust within a certain angle or displacement range, and at the same time maintains the sealing property and structural strength, so as to facilitate the second end of the connecting pipeline 9 to follow the adjustment of the installation position of the movable flange 2. For example, the conveying pipeline 10 and the second end of the connecting pipeline 9 can be flange hinged, the flanges can be connected by a pin shaft, allowing small-angle swinging, supporting fine adjustment, and being suitable for small-range deviation. The conveying pipeline 10 and the second end of the connecting pipeline 9 can also be connected through a rotary joint, supporting 360° rotation, being reliable in sealing, and being suitable for occasions that need frequent adjustment.

[0071] In some modified embodiments of the present application, a sealing gasket is further included, which is clamped between the fixed flange 8 and the movable flange 2.

[0072] The height of the outlet of the connecting pipe 9 is adjusted by replacing the mounting hole 81 of the movable flange 2 on the fixed flange 8, thereby changing the position of the vertex of the inverted U-shaped drainage path. This process involves switching the position of the flange connection, which, if the sealing structure is not properly designed, can cause leakage of crude benzene vapor (flammable and toxic) at the connection, water phase liquid exosmosis, environmental pollution, damage to the liquid seal function, and affect the oil-water separation effect. Therefore, in some modified embodiments, a sealing gasket is introduced between the fixed flange 8 and the movable flange 2, which can maintain good sealing performance in different installation positions and ensure the sealing integrity during the adjustment process. The sealing gasket is a flexible sealing element placed between two flange surfaces, which is compressed by the pre-tightening force of the bolts, fills the micro-unevenness of the flange sealing surface, forms a continuous sealing barrier, and prevents gas or liquid leakage.

[0073] Before flange installation, the crude benzene oil-water separator connecting pipe 9 can be closed, the internal crude benzene and water can be discharged and cleaned, the inlet and outlet pipes can be blanked, the benzene gas can be steamed and blown and detected to be qualified. Prepare the corresponding tools, as well as the new movable flange 2, the positioning pin 5, the temperature sensor 6, the density sensor 7, and the connecting line. When the movable flange 2 is installed, the fixed water outlet 3 pipe is removed, impurities and oil stains are cleaned, the surface is ensured to be flat, the fixed flange 8 is welded to the water outlet 3, and the fixed flange 8 is ensured to be firmly sealed. Equidistant positioning holes are drilled on the fixed flange 8 of the water outlet 3 pipe, the positioning pin 5 is fitted, and the movable flange 2 is installed.

[0074] The temperature sensor 6 is installed at the top of the shell to measure the influence of gas temperature; the density sensor 7 is installed at the upper part of the inside to contact the crude benzene to monitor the density change. The sensor signal line is connected to the input end of the controller through the sealed wire slot.

[0075] Start the sensor inspection data collection. Simulate the temperature and density changes, and test the controller to calculate the water outlet 3 height adjustment. Fine-tune the parameters to ensure sensitive response.

[0076] A method for using the oil-water separator described above, comprising the following steps:

[0077] S1, obtaining or calculating the oil-water interface position information in the separator main body 1;

[0078] The oil-water interface position information can be obtained by manual observation (such as a sight glass), sensor detection (such as a density sensor 7 and a temperature sensor 6), or historical operation data calculation. Endoscopy can be combined for visual confirmation to improve the accuracy of judgment.

[0079] S2, determining the target height according to the oil-water interface position information;

[0080] The target height refers to the height of the second end of the connecting pipe 9. The target height can be set at a distance (e.g. 50-200 mm) below the oil-water interface to ensure that only the water phase is discharged and the crude benzene is not entrained. The target height value can be generated according to process experience or a preset algorithm.

[0081] S3. The operator selects the mounting hole 81 of the corresponding height on the fixed flange 8 according to the target height, dismounts and re-mounts the movable flange 2 to the target position, so that the second end of the connecting pipe 9 is below the oil-water interface, ensuring that the water phase can be stably discharged without entraining the oil phase.

[0082] The movable flange 2 is connected to the first part mounting hole 81 or the second part mounting hole 81 on the fixed flange 8 through bolts, and different mounting positions correspond to different outlet heights of the connecting pipe 9. When mounting, it is necessary to ensure that the gasket is correctly placed and the bolts are tightened according to the standard torque.

[0083] The verification can be performed by observing the water quality, the signal of the density sensor 7 or the running state of the subsequent processing unit. If it is found that the discharged water contains oil, the step S1 is returned to readjust. Through the above method, the dynamic adaptation of the oil-water separation process is realized, and the crude benzene recovery rate and the water purity are significantly improved.

[0084] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil-water separator characterized by, The oil-water separator comprises: a separator body (1), a side wall of the separator body (1) is provided with a water outlet (3) for discharging the separated water phase; a fixed flange (8) fixedly installed at the water outlet (3) of the separator body (1) and in communication with the inside of the separator body (1); a movable flange (2) detachably connected to the outside of the fixed flange (8); a connecting pipeline (9) having a first end connected to the movable flange (2); a conveying pipeline (10) connected to a second end of the connecting pipeline (9), the second end of the connecting pipeline (9) being located above the conveying pipeline (10), and the second end of the connecting pipeline (9) being located at the same horizontal position as or above the first end of the connecting pipeline (9); wherein a plurality of mounting holes (81) are provided on the fixed flange (8) corresponding to different mounting positions of the movable flange (2) to adjust the height of the second end of the connecting pipeline (9).

2. The oil-water separator according to claim 1, wherein a first part of the mounting holes (81) corresponds to a first mounting position of the movable flange (2), and a second part of the mounting holes (81) corresponds to a second mounting position of the movable flange (2), and the second part of the mounting holes (81) and the first part of the mounting holes (81) are spaced apart by a certain angle.

3. The oil-water separator according to claim 2, wherein the first part of the mounting holes (81) and the second part of the mounting holes (81) are uniformly distributed along the circumference of the fixed flange.

4. The oil-water separator of claim 1, wherein, Further comprising: a density sensor (7) provided in the separator body (1) for detecting the density of the target liquid.

5. The oil-water separator of claim 4, wherein, Further comprising: a controller capable of being connected to the density sensor (7) for receiving signals sent by the density sensor (7).

6. The oil-water separator of claim 5, wherein, Further comprising: a temperature sensor (6) provided at the top of the separator body (1), the temperature sensor (6) being connected to the controller.

7. The oil-water separator of claim 1, wherein Further comprising: an endoscope provided on the separator body for observing the oil-water separation interface.

8. The oil-water separator according to claim 1, wherein the conveying pipeline (10) is movably connected to the second end of the connecting pipeline (9).

9. The oil-water separator of claim 1, wherein, Further comprising: a sealing gasket clamped between the fixed flange (8) and the movable flange (2).

10. A method of using an oil-water separator as claimed in any one of claims 1-9, characterized in that, The method comprises the following steps: obtaining or calculating the oil-water interface position information in the separator body (1); determining a target height according to the oil-water interface position information; an operator selects a mounting hole (81) on the fixed flange (8) corresponding to the target height according to the target height, detaches and re-installs the movable flange (2) to a target position, so that the second end of the connecting pipeline (9) is located below the oil-water interface, and ensures that the water phase can be stably discharged without entraining the oil phase.

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