A blow-off gas recovery gas separation device

Abstract

The present application relates to the technical fields of separation device, and discloses a kind of separation device for recovery gas of emission gas, including tank body, multiple umbrella plates are installed in tank body along up and down direction, gas outlet is set in the top of tank body, drain outlet is set in the bottom, liquid inlet is set in the side face, screen layer is arranged in gas outlet, further including: buffer assembly, fixedly set in tank body, and located the position corresponding to drain outlet;Splitting component, set below liquid inlet, by multiple rotating plates in circumferential array, and hinged on tank body inner wall, the liquid distribution groove for receiving falling liquid stream is formed between rotating plate and tank body inner wall, through the synergistic effect of control assembly and buffer assembly, the angle of rotating plate can be automatically adjusted according to the change of liquid flow, so as to change the volume of liquid distribution groove and the size of shunt hole, realize that gas in liquid can be fully separated when liquid flow is small, avoid rising airflow and liquid mixing again when flow is large.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of separation devices, in particular to a blow-off gas recovery gas separation device. BACKGROUND

[0002] In the exploration and development process of modern oil and gas industry, the fluid extracted from the underground oil and gas reservoir is not a pure single-phase substance, but a multi-phase mixture composed of crude oil (liquid phase), natural gas (gas phase), formation water (liquid phase) and a small amount of solid impurities such as mud, wax and asphaltene. Before entering the subsequent gathering, metering, refining or marketing links, this oil, gas, water and solid mixture must undergo a series of surface treatments, the first and most important step of which is separation. Among the many separation devices, the gas-liquid two-phase separator is one of the basic devices, and its core task is to effectively separate the gas phase (mainly natural gas) and the liquid phase (mainly the mixture of crude oil and water) in the produced fluid. According to its installation form, it can be divided into horizontal separators and vertical separators. Among them, the vertical gas-liquid two-phase separator has the advantages of small footprint, better handling of fluids containing solid impurities and effective response to high gas-liquid ratio conditions.

[0003] The Chinese patent document with the authorization announcement number CN2109238U discloses a composite cylinder vertical oil-gas two-phase separator for oil-gas separation in the oil exploitation industry. According to the basic principle of oil-gas two-phase separation, the gas collection part is embedded in the separator in the form of a gas collection umbrella and a gas collection pipe, and gas is collected above the oil-gas separation interface. The separator has two upper and lower cylinders, so that the oil flows to the lower cylinder after filling the upper cylinder. A number of oil discharge holes are opened at the bottom of the upper cylinder to continuously discharge a small amount of oil to prevent the upper cylinder from accumulating impurities and dead oil. In this way, the height of the entire device is only 60%-70% of that of the traditional separator.

[0004] The Chinese patent document with the authorization announcement number CN204490671U discloses a vertical gas-liquid two-phase gravity separator for geothermal deep well wellheads. The technical solution is that one side of the tank body is provided with a liquid inlet pipe, the other side of the tank body is provided with a liquid outlet pipe, the tank body is provided with a gas outlet pipe, a pollution discharge pipe, a liquid level display and a safety valve, the liquid level display is connected with a liquid level controller, the top of the tank body is provided with a pressure gauge, the pressure gauge is connected with a pressure sensor, the gas outlet pipe is provided with a pressure control valve, the liquid inlet pipe is connected with a water vapor dilution device inside the separation cavity through a primary separator, the lower part of the water vapor dilution device is provided with a cyclone wing plate, and the bottom of the liquid collection cavity is provided with a horizontal baffle. The beneficial effects of this patent are that the device has the functions of using a submersible pump to work for a heat exchange device, stabilizing pressure and continuous flow, and separating water vapor and removing sand particles in water at one time, and it is convenient to realize automatic control of pollution discharge and liquid level, and it is suitable for handling large flow of gas-containing liquid.

[0005] The internal structure of a traditional vertical separator is generally static. For example, a fixed impact baffle is arranged at the liquid inlet, and a wire mesh or vane type mist eliminator is arranged at the upper part of the device, and the working thereof depends on the natural deceleration and gravity settling of fluid entering the tank body. The existing technology is that liquid collides on the baffle after entering the liquid inlet, and then falls on the umbrella plate below. Therefore, the liquid flow is gathered together, which cannot effectively disperse the gas in the interior during the falling and colliding process. In addition, under stable working conditions, such design can meet the basic separation requirements. The production flow state of an oil and gas well, especially the fluid from a long pipeline or a gas lift well, often presents non-steady state characteristics, which causes the flow to change frequently. The existing device has poor adaptability to such changes. SUMMARY

[0006] The present application provides a blowout gas recovery gas separation device, which aims to solve the problem that the liquid flow is gathered together after entering the tank body, which cannot effectively disperse the gas in the interior.

[0007] A blowout gas recovery gas separation device, comprising a tank body, a plurality of umbrella plates are installed in the tank body along the up-down direction, an air outlet is arranged at the top of the tank body, a liquid outlet is arranged at the bottom of the tank body, and a liquid inlet is arranged at the side of the tank body, a wire mesh layer is arranged in the air outlet, and the device further comprises:

[0008] A buffer assembly is fixedly arranged in the tank body and located at a position corresponding to the liquid outlet;

[0009] A flow splitting assembly is arranged below the liquid inlet and comprises a plurality of rotating plates arranged in a circumferential array and hinged to the inner wall of the tank body, a liquid distribution groove is formed between the rotating plate and the inner wall of the tank body for receiving the falling liquid flow, and a flow splitting hole is formed between every two adjacent rotating plates for passing the liquid flow;

[0010] A control assembly is used to control the synchronous rotation of all rotating plates and change the included angle between the rotating plate and the tank body axis;

[0011] When the liquid inlet flow is small, the included angle a between the rotating plate and the tank body axis is 55-70°, when the liquid inlet flow increases, the control assembly makes the rotating plates rotate synchronously, the angle a decreases, the capacity of the liquid distribution groove increases, and at the same time, the inner ends of the adjacent sides of the rotating plates move away from each other, the area of the flow splitting hole increases, and the projection of the flow splitting hole on the cross section of the tank body shortens.

[0012] Its effect lies in: when the liquid flow is small, the liquid tank can disperse the liquid flow into multiple small flow liquid streams, the contact area with air is greatly increased when the liquid flow at the liquid tank and the flow hole, and the gas is more easily escaped from the liquid flow, so that the gas in the liquid can be fully separated, and when the liquid flow increases, the control assembly changes the angle of the rotating plate, the capacity of the liquid tank increases to avoid the overflow of the liquid flow, ensuring the stable operation of the device, the increased flow hole area can make more liquid flow smoothly, the shortened projection of the flow hole further reduces the contact area of the rising air flow and the falling liquid flow, avoiding the mixing of the rising air flow and the liquid again, improving the adaptability and separation efficiency of the device to different flow liquid streams.

[0013] Preferably, the control assembly comprises an umbrella-shaped linkage and a driving assembly for controlling the opening and closing of the umbrella-shaped linkage, the middle part of the umbrella-shaped linkage is installed in the middle part of the tank body, and the multiple hinge segments around the umbrella-shaped linkage are hinged with the rotating plate respectively, the opening and closing of the umbrella-shaped linkage is controlled by the driving assembly, the synchronous rotation of the rotating plate can be realized, the consistency and stability of the angle adjustment of the rotating plate are ensured, and the problem that the flow separation effect is affected by the inconsistent rotation angle of the rotating plate is avoided, when the liquid flow is small, the driving assembly makes the umbrella-shaped linkage in the closed state, at this time, the included angle α between the rotating plate and the axis of the tank body is 55°-70°, the liquid tank can effectively disperse the liquid flow into multiple small flow liquid streams, the contact area of the liquid flow and air is increased, which is beneficial to the escape of gas from the liquid flow, and when the liquid flow increases, the driving assembly pushes the umbrella-shaped linkage to open, the rotating plate rotates synchronously, the angle of α is reduced, the capacity of the liquid tank is increased, and the area of the flow hole is also increased, and the projection of the flow hole on the cross section of the tank body is shortened, which ensures that the liquid flow can flow smoothly and avoids the mixing of the rising air flow and the falling liquid flow again.

[0014] Preferably, the umbrella-shaped linkage comprises a lifting block and multiple connecting rods, the middle part of the tank body is fixedly connected with a vertical rod, the lifting block is slidingly installed on the vertical rod, and the connecting rods are arranged in a circumferential array and hinged on the lifting block, the movement of the connecting rods is driven by the sliding of the lifting block on the vertical rod, and then the angle adjustment of the rotating plate is realized, when the lifting block rises, the connecting rods pull the rotating plate to rotate, so that the included angle α between the rotating plate and the axis of the tank body is reduced, and when the lifting block descends, the connecting rods push the rotating plate to rotate, so that the angle α is increased, so that the angle of the rotating plate can be adjusted synchronously.

[0015] Preferably, the buffer assembly comprises a stop block sliding in the radial direction of the tank body, and the liquid flow ejected from the liquid inlet hits the stop block and then falls into the liquid tank.

[0016] Preferably, the driving assembly comprises elastic members and a transmission rod, the elastic members are installed between the connecting rods for making the connecting rods have a tendency to close, and the transmission rod is hingedly connected with the lifting block and the stopper at two ends, when the liquid flow is small, the elastic members make the connecting rods in a closed state, and drive the lifting block to be located at a high position, at this time, the included angle a between the rotating plate and the axis of the tank is 55-70°, the liquid flow can be dispersed into multiple small flow liquid streams by the distribution groove, which is beneficial for the gas to escape from the liquid flow, with the increase of the liquid flow, the impact force of the liquid flow on the stopper increases, the stopper slides inward along the radial direction of the tank, and drives the lifting block to slide upward along the vertical rod through the transmission rod, so that the connecting rods are opened, the rotating plate rotates synchronously, the angle a is reduced, the capacity of the distribution groove is increased, the area of the distribution hole is also increased, and the projection of the distribution hole on the cross section of the tank is shortened, so that the liquid flow can smoothly pass through, the rising gas flow and the falling liquid flow are prevented from mixing again, the change of the liquid flow impact force is utilized to automatically adjust the angle of the rotating plate, so that the device can adaptively change the state of the distribution groove and the distribution hole according to the change of the liquid flow, and the separation efficiency of the device and the adaptability to different working conditions are improved.

[0017] Preferably, the shape of the stopper is tile-shaped, the tile-shaped stopper has many advantages, on the one hand, the curved surface of the tile-shaped stopper can better guide the dispersion of the liquid flow, so that the liquid flow sprayed from the liquid inlet is more evenly dispersed to all directions after impacting the stopper, thereby being more effectively fallen into the distribution groove, further enhancing the dispersion effect of the liquid flow, increasing the contact area of the liquid flow and air, and being beneficial for the gas to escape, on the other hand, when the tile-shaped stopper bears the impact of the liquid flow, the structure thereof can better disperse the impact force, reduce the situation that the local force is too large, and improve the service life and stability of the stopper.

[0018] Preferably, the two sides of the connecting rod are connected with branch rods, so that all the connecting rods and branch rods form a circular truncated cone cage structure, small liquid droplets carried in the rising gas can condense on the cage structure, and the gas-liquid separation effect is improved.

[0019] Preferably, a leakage hole is formed in the middle of the rotating plate, and a gate assembly is installed on the leakage hole, when the liquid flow is small, the gate assembly closes the leakage hole, so that the liquid flow mainly flows through the distribution groove and the distribution hole, and the liquid flow is ensured to fully contact with air to realize gas escape, with the continuous increase of the liquid flow, when the angle a is small, the gate assembly rotates to open the leakage hole, and part of the liquid flow can directly fall through the leakage hole, so as to reduce the flow pressure of the distribution groove and the distribution hole, avoid excessive accumulation of the liquid flow on the rotating plate, and avoid the device from forming a water curtain to hinder the gas to escape under the condition of large liquid flow.

[0020] Preferably, the shutter assembly comprises a shutter rotatably mounted on the upper surface of the discharge port for blocking the discharge port and a control member for controlling rotation of the shutter, and when the angle of alpha is less than 47°, the shutter rotates to open the discharge port.

[0021] Preferably, the control member is a counterweight plate fixedly connected to the hinge of the shutter, and when the angle of alpha continuously decreases, the center of gravity of the shutter assembly passes through the vertical plane where the rotation axis of the rotating plate is located, so that the shutter rotates relative to the rotating plate, the rotating plate is provided with a limiting block for limiting the rotation angle of the shutter relative to the rotating plate, so that the maximum rotation angle of the shutter relative to the rotating plate is 5°-10°, and when the liquid flow continuously increases, the impact force of the liquid flow on the baffle also gradually increases, so that the transmission rod moves and in turn pushes the lifting block to move upward, and with the lifting block rising, all the ends of the rotating plate close to the axis of the tank will be synchronously tilted upward through the action of the umbrella-shaped linkage group, and in this process, the angle alpha between the rotating plate and the axis of the tank continuously decreases, when the center of gravity of the shutter assembly passes through the vertical plane where the rotation axis of the rotating plate is located from the inside, the shutter rotates relative to the rotating plate, so that the discharge hole is opened, and part of the liquid in the distribution tank will flow out from the discharge hole, effectively avoiding the phenomenon that the liquid flow overflows from the top end of the rotating plate and forms a water curtain, and when the liquid flow gradually decreases, the impact force on the baffle will also decrease, the elastic member makes the connecting rods close to each other, the angle of the angle alpha gradually increases, and when the center of gravity of the shutter assembly passes through the vertical plane where the rotation axis of the rotating plate is located from the outside, the shutter assembly rotates relative to the rotating plate and resets to the initial state.

[0022] By adopting the technical scheme, the application has the following beneficial effects:

[0023] 1、When the liquid of mixed gas flows into the tank from the liquid inlet, it will first hit the tile-shaped baffle of the buffer assembly. When the flow is small, the impact force of the liquid flow on the baffle is small, the angle α between the rotating plate and the axis of the tank is between 55°-70°, the liquid level in the distribution tank is low, the projection of the distribution hole on the cross section of the tank is long, and the falling liquid flow is more dispersed, which helps the gas in the liquid flow to quickly separate from the liquid, improving the separation effect. After the liquid flow falls on the bottom of the tank, the remaining gas in the liquid moves upward and then passes through the lower umbrella plate. The liquid droplets in the gas condense on the umbrella plate and then drip down along the umbrella plate. The gas continues to rise and passes through the cage structure, the upper umbrella plate and the wire mesh layer in turn, intercepting the small liquid droplets carried in the gas, and finally the gas is discharged from the gas outlet. As the flow of the liquid flow increases, the impact force of the liquid flow on the baffle increases, the baffle slides along the cross bar, and the lifting block is driven by the transmission rod to rise along the vertical rod. Since the lifting block is hinged to the connecting rod, and the connecting rod is hinged to the rotating plate, the umbrella-shaped linkage set is spread out, and all the rotating plates are simultaneously tilted upward at the end close to the axis of the tank. At this time, the angle α is smaller, the capacity of the distribution tank is increased, and more liquid flow from the buffer assembly can be accommodated; at the same time, the distribution holes between every two adjacent rotating plates are opened at the end close to the axis of the tank, the flow area of the distribution holes is increased, and the position of the liquid flow passing through the distribution holes on the lower umbrella plate is moved closer to the inner wall of the tank, thereby expanding the space for the intermediate gas to pass through and reducing the mixing of the gas with the downward liquid flow when the gas rises.

[0024] 2、When the flow of the liquid flow continues to increase, the impact force of the liquid flow on the baffle also gradually increases, the impact force acts on the transmission rod, causing the transmission rod to move, and then pushing the lifting block to move upward. As the lifting block rises, the umbrella-shaped linkage set is spread out, and all the rotating plates are simultaneously tilted upward at the end close to the axis of the tank. During this process, the angle α between the rotating plate and the axis of the tank continuously decreases. When the center of gravity of the gate assembly passes through the vertical plane in which the rotating shaft of the rotating plate is located from the inside, the gate rotates relative to the rotating plate, thereby opening the leakage hole. Part of the liquid in the distribution tank will flow out of the leakage hole, effectively preventing the liquid flow from overflowing from the top end of the rotating plate and forming a water curtain. When the flow of the liquid flow gradually decreases, the impact force of the liquid flow on the baffle also decreases. At this time, the action of the elastic member causes the connecting rod to close and drive the rotating plate to rotate, resulting in the angle α gradually increasing. When the center of gravity of the gate assembly passes through the vertical plane in which the rotating shaft of the rotating plate is located from the outside, the gate assembly rotates relative to the rotating plate and returns to the initial state, ensuring that the liquid flow can be effectively controlled and adjusted at different flow rates and preventing the liquid from overflowing to form a water curtain to block the gas from rising. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a sectional view of the present application at a small flow rate.

[0026] Figure 2Structure diagram of the shunt assembly in the application when the flow is small.

[0027] Figure 3 Bottom view of the shunt assembly in the application.

[0028] Figure 4 Front view of the transmission rod in the application.

[0029] Figure 5 Sectional view of the application when the flow is large.

[0030] Figure 6 Structure diagram of the shunt assembly in the application when the flow is large. Figure 5 Enlarged structure diagram of A in the application.

[0031] Figure 7 Structure diagram of the shunt assembly in the application when the flow is small.

[0032] Reference signs:

[0033] 1, tank body; 11, horizontal rod; 12, vertical rod; 2, wire mesh layer; 3, umbrella panel; 4, buffer assembly; 5, shunt assembly; 51, rotating plate; 511, gate plate; 512, counterweight; 513, limiting block; 52, umbrella linkage; 521, lifting block; 522, connecting rod; 5221, branch rod; 53, elastic member; 54, transmission rod. DETAILED DESCRIPTION

[0034] Embodiments of the application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application.

[0035] As Figure 1As shown, a kind of blow-off gas recovery gas separation device, including tank body 1, the top of tank body 1, middle part of side and bottom are provided with gas outlet, liquid inlet and liquid outlet respectively, valve is installed on liquid outlet, for the liquid in tank body 1 is exported tank body 1, is sequentially provided with silk screen layer 2, upper umbrella plate 3, buffer assembly 4, shunt component 5 and lower umbrella plate 3 from top to bottom in tank body 1, tank body 1 can also be routinely installed liquid level meter, pressure gauge, safety valve and automatic liquid discharge control system and the like accessories, the liquid of mixed gas is entered into tank body 1 by liquid inlet, first impact on buffer assembly 4 to buffer liquid, then liquid falls on shunt component 5, shunt component 5 will be divided into multiple strands, then multiple strands of liquid falls on lower umbrella plate 3, after being gathered in the bottom of tank body 1 by the through hole on umbrella plate 3, in this process, the significant density difference between gas phase and liquid phase, natural stratification in gravity field, gas separation in the liquid in the bottom of tank body 1 moves upward, small liquid drops carried in gas are intercepted by each umbrella plate 3 and condensed on umbrella plate 3, and finally gas passes through silk screen layer 2, and small liquid drops are directly intercepted by fine structure, and finally gas is discharged through gas outlet.

[0036] As shown in Figure 1 and Figure 2 , shunt component 5 is located below liquid inlet, shunt component 5 includes control assembly and a plurality of rotating plates 51, rotating plates 51 are arranged in a circumferential array about the axis of tank body 1, the outer portion of rotating plate 51 is hinged to the inner wall of tank body 1, and a liquid separation groove for receiving liquid flow falling from buffer assembly 4 is formed between rotating plate 51 and the inner wall of tank body 1, rotating plate 51 is generally trapezoidal in shape, and control assembly is used to control the angle of rotating plate 51, the gap between every two adjacent rotating plates 51 forms a shunt hole for shunting liquid, when the included angle α between rotating plate 51 and the axis of tank body 1 decreases, the end of shunt hole close to the axis of tank body 1 opens, thereby increasing the flow area of shunt hole, and at the same time, the position of liquid flow falling on lower umbrella plate 3 through shunt hole changes, so that the position of liquid flow falling on umbrella plate 3 moves towards the inner wall of tank body 1, so that the space for gas passing through is increased when the flow is large, and the mixing of gas with downward liquid flow when rising is reduced.

[0037] As shown in Figures 2-4As shown, the control assembly comprises an umbrella-shaped linkage 52 and a driving assembly for driving the umbrella-shaped linkage 52 to open and close, the umbrella-shaped linkage 52 comprises a lifting block 521 and a plurality of connecting rods 522, the middle part of the tank body 1 is fixedly connected with a horizontal rod 11, the bottom end of the horizontal rod 11 is fixedly connected with a vertical rod 12, the lifting block 521 is slidingly installed on the vertical rod 12 in the up-down direction, the shape of the lifting block 521 is circular, a plurality of hinged grooves are formed at the circular edge, one end of the connecting rod 522 is hinged in the hinged groove, the top end of the rotating plate 51 is provided with a hinged shaft, the other end of the connecting rod 522 is hinged with the top of the rotating plate 51 through the hinged shaft, the driving assembly is used for controlling the synchronous rotation of the connecting rods 522, so as to control the umbrella-shaped linkage 52 to open and close, and the volume of the distribution tank and the size of the distribution hole are changed by controlling the synchronous rotation of all the rotating plates 51 through the opening and closing of the umbrella-shaped linkage 52.

[0038] The two sides of the connecting rod 522 are connected with branch rods 5221, the branch rods 5221 are inclined to the outer end of the connecting rod 522, so that all the connecting rods 522 and the branch rods 5221 form a circular truncated cone cage structure for making small liquid droplets carried in the gas condense on the cage structure.

[0039] As shown in Figure 2 , Figure 3 and Figure 4 , the driving assembly comprises an elastic member 53 and a transmission rod 54, the elastic member 53 is installed between the connecting rods 522 for applying a mutual approaching force to the connecting rods 522, one end of the transmission rod 54 is hinged with the lifting block 521, the other end is hinged with the buffer assembly 4, the movement of the transmission rod 54 is controlled through the action of the buffer assembly 4 on the liquid flow, so as to control the lifting of the lifting block 521, and finally the synchronous rotation of all the rotating plates 51 is controlled through the opening and closing of the umbrella-shaped linkage 52;

[0040] The buffer assembly 4 comprises a baffle, the shape of the baffle is tile-shaped, the top of the baffle is slidingly installed on the horizontal rod 11, so that the baffle can slide along the horizontal rod 11, and the baffle is located at the corresponding position inside the liquid inlet, when the flow of the liquid flow is small, the impact force on the baffle is small, at this time, the included angle α between the rotating plate 51 and the axis of the tank body 1 is 55°-70° (as Figure 1As shown, the liquid flow is relatively low in the separating tank, causing it to fall through the diversion hole. At this time, the projection of the diversion hole on the cross-section of the tank 1 is relatively long, so the falling liquid flow is more dispersed, allowing the gas in the liquid flow to quickly separate from the liquid and enhancing the separation effect. When the liquid flow rate increases, the impact force on the baffle increases, causing the transmission rod 54 to move, which in turn causes the lifting block 521 to rise. Finally, through the opening of the umbrella-shaped connecting rod group 52, the ends of all rotating plates 51 near the axis of the tank 1 tilt upwards synchronously, increasing the volume of the separating tank and the size of the diversion hole. At this time, the angle α between the rotating plate 51 and the axis of the tank 1 is not less than 45°. At this time, the projection of the diversion hole on the cross-section of the tank 1 is shortened, increasing the space for gas to pass through at the axis of the tank 1, thereby preventing the rising airflow from mixing with the liquid flow again before it has time to rise.

[0041] To prevent the liquid from overflowing from the top of the rotating plate 51 and forming a water curtain when the flow rate is too high, which would prevent the airflow between the water curtain and the inner wall of the tank 1 from being discharged and affect gas separation, a drain hole is provided in the middle of the rotating plate 51 near its bottom, and a gate assembly is installed on the drain hole.

[0042] like Figures 1-7 As shown, the gate assembly includes a gate 511 and a control component for rotating the gate 511. The drain hole is a square stepped hole. The bottom of the gate 511 is rotatably mounted at the bottom of the stepped hole, and a limit block 513 is provided between the bottom of the rotating plate 51 and the stepped hole. The rotation range of the gate 511 is limited by the stepped hole and the limit block 513, so that the maximum angle of rotation of the gate 511 relative to the rotating plate 51 is 5°-10°. The control component is a counterweight 512, and the bottom end of the counterweight 512 is fixedly connected to the bottom end of the gate 511. When the liquid flow rate continues to increase, the impact force on the baffle gradually increases, thereby causing the transmission rod 54 to move, which in turn causes the lifting block 521 to rise. Finally, through the opening of the umbrella-shaped connecting rod assembly 52, the ends of all rotating plates 51 closest to the axis of the tank 1 rise synchronously. The angle α between the rotating plate 51 and the axis of the tank 1 is continuously reduced as the gate assembly tilts upward. When the center of gravity of the gate assembly passes through the vertical plane where the rotation axis of the rotating plate 51 is located from the inside (when the center of gravity of the gate assembly coincides with the vertical plane, the angle α can be any value between 47° and 45°), the gate 511 rotates relative to the rotating plate 51, thereby opening the drain hole and allowing part of the liquid in the liquid distribution tank to flow out from the drain hole, preventing the liquid from overflowing from the top of the rotating plate 51 and forming a water curtain. As the liquid flow decreases, the impact force on the baffle gradually decreases, and the elastic element 53 causes the connecting rod 522 to rotate with the rotating plate 51, and the angle α gradually increases. When the center of gravity of the gate assembly passes through the vertical plane where the rotation axis of the rotating plate 51 is located from the outside, the gate assembly rotates and resets relative to the rotating plate 51.

[0043] The overall fluid separation path is as follows:

[0044] Liquid path: the oil-gas mixture enters the tank 1 from the liquid inlet, first impacting the energy buffer assembly 4 to achieve energy buffering; then, the liquid falls to the flow splitting assembly 5, is split into multiple streams and adjusted in flow rate, and then falls; then, the liquid flows through the lower umbrella plate 3 and is finally collected in the liquid collection area at the bottom of the tank 1 through the through holes in the umbrella plate 3, and is discharged through the liquid outlet.

[0045] Gas path is divided into three parts, one of which: when the gas impacts the energy buffer assembly 4, it moves upward under the action of gravity and is separated from the liquid, sequentially passing through the upper umbrella plate 3 and the silk screen layer 2 at the top, in the process, the liquid droplets entrained in the gas are intercepted, condensed and fall back, and finally the clean and dry gas is discharged from the top gas outlet;

[0046] The second part: when the liquid falls to the lower umbrella plate 3 from the liquid separation groove, the gas is separated from the liquid, and then sequentially passes through the cage structure of the flow splitting assembly 5, the upper umbrella plate 3 and the silk screen layer 2 at the top, in the process, the liquid droplets entrained in the gas are intercepted, condensed and fall back, and finally the clean and dry gas is discharged from the top gas outlet;

[0047] The third part: the gas separated from the bottom liquid sequentially passes through the lower umbrella plate 3, the cage structure of the flow splitting assembly 5, the upper umbrella plate 3 and the silk screen layer 2 at the top, in the process, the liquid droplets entrained in the gas are intercepted, condensed and fall back, and finally the clean and dry gas is discharged from the top gas outlet.

[0048] Working principle: when the liquid of the mixed gas enters the tank 1 from the liquid inlet, it first impacts the tile-shaped baffle of the energy buffer assembly 4, when the flow rate is small, the impact force of the liquid flow on the baffle is small, the angle α between the rotating plate 51 and the axis of the tank 1 is 55°-70° (as shown in Figure 1 The liquid level in the liquid separation groove is low, the projection of the flow splitting hole on the cross section of the tank 1 is long, the falling liquid flow is relatively dispersed, which is beneficial to the rapid separation of the gas in the liquid flow from the liquid, and enhances the separation effect, the remaining gas in the liquid moves upward, then passes through the lower umbrella plate 3, the liquid droplets in the gas condense on the umbrella plate 3, then drop along the umbrella plate 3, the gas continues to rise and sequentially passes through the cage structure, the upper umbrella plate 3 and the silk screen layer 2, intercepts the small liquid droplets carried in the gas, and finally the gas is discharged through the gas outlet;

[0049] With the increase of liquid flow, the impact force of the liquid flow on the baffle increases, the baffle slides along the horizontal rod 11, drives the lifting block 521 to rise along the vertical rod 12 through the transmission rod 54, since the lifting block 521 is hinged to the connecting rod 522, and the connecting rod 522 is hinged to the rotating plate 51, the umbrella-shaped linkage group 52 starts to spread, and all the rotating plates 51 synchronously tilt upward at the end close to the axis of the tank 1, at this time, the angle α decreases, the capacity of the distribution groove increases, and more liquid flow can be received from the buffer assembly 4; at the same time, the flow distribution holes between every two adjacent rotating plates 51 open at the end close to the axis of the tank 1, the flow area of the flow distribution holes increases, and the position of the liquid flow falling on the lower umbrella plate 3 through the flow distribution holes is close to the inner wall of the tank 1, which increases the space for the middle gas to pass through and reduces the mixing of the gas with the downward liquid flow when rising.

[0050] When the liquid flow continues to increase, the angle α continuously decreases, when the gravity center of the baffle assembly passes through the vertical plane where the rotating shaft of the rotating plate 51 is located from the inside, the baffle 511 rotates relative to the rotating plate 51, and the leakage hole is opened (as shown in Figures 5-7 ), part of the liquid in the distribution groove flows out from the leakage hole, avoiding the overflow of the liquid flow from the top end of the rotating plate 51 to form a water curtain, preventing the air flow between the water curtain and the inner wall of the tank 1 from being discharged and affecting the gas separation.

[0051] When the liquid flow decreases, the impact force of the liquid flow on the baffle gradually decreases, the transmission rod 54 drives the lifting block 521 to reset, the connecting rod 522 rotates with the rotating plate 51, and the angle α gradually increases. When the gravity center of the baffle assembly passes through the vertical plane where the rotating shaft of the rotating plate 51 is located from the outside, the baffle assembly rotates relative to the rotating plate 51 to reset, the leakage hole is closed, and the device returns to the working state at a small flow.

[0052] In addition, the branch rods 5221 connected to the two sides of the connecting rod 522 form a circular truncated cone cage structure, small liquid droplets carried in the rising gas condense on the cage structure, improving the gas-liquid separation effect, through the coordinated action of the control assembly and the buffer assembly 4, the angle of the rotating plate 51 can be automatically adjusted according to the change of the liquid flow, thereby changing the volume of the distribution groove and the size of the flow distribution hole, realizing the full separation of the gas in the liquid flow at a small flow, avoiding the mixing of the rising gas flow with the liquid at a large flow, and improving the efficiency and adaptability of the gas-liquid separation.

[0053] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A blow-off gas recovery gas separation device, comprising a tank body (1), a plurality of umbrella plates (3) are installed in the tank body (1) along the up-down direction, a gas outlet is arranged at the top of the tank body (1), a liquid outlet is arranged at the bottom of the tank body (1), and a liquid inlet is arranged at the side of the tank body (1), a wire mesh layer (2) is arranged in the gas outlet, characterized in that, Also include: Buffering assembly (4) is fixedly arranged in the tank (1), and is located at the position corresponding to the liquid outlet; Shunt assembly (5) is arranged below the liquid inlet, which is composed of a plurality of circumferential array of rotating plates (51) and is hinged on the inner wall of the tank (1), the rotating plate (51) and the inner wall of the tank (1) form a liquid distribution groove for receiving the falling liquid flow, and the gap between every two adjacent rotating plates (51) forms a shunt hole for liquid flow; Control assembly for controlling the synchronous rotation of all rotating plates (51) to change the angle between rotating plate (51) and tank (1) axis; When the liquid flow is small, the angle α between the rotating plate (51) and the tank (1) axis is 55°-70°, when the liquid flow increases, the control assembly makes the rotating plate (51) rotate synchronously, the angle α decreases, the capacity of the liquid distribution groove increases, and at the same time, the inner end of the adjacent side of the rotating plate (51) moves away from each other, the area of the shunt hole increases, and the projection of the shunt hole on the cross section of the tank (1) is shortened.

2. The blow-by gas recovery gas separation device of claim 1, wherein, The control assembly includes umbrella-shaped linkage (52) and driving assembly for controlling the opening and closing of umbrella-shaped linkage (52), the middle part of umbrella-shaped linkage (52) is installed in the middle part of the tank (1), and the surrounding multiple hinge segments are respectively hinged with the rotating plate (51).

3. The blow-by gas recovery gas separation device of claim 2, wherein, The umbrella-shaped linkage (52) includes lifting block (521) and multiple connecting rods (522), the middle part of the tank (1) is fixedly connected with vertical rod (12), the lifting block (521) is slidingly installed on the vertical rod (12), and the connecting rods (522) are circumferentially arranged and hinged on the lifting block (521).

4. The blow-by gas recovery gas separation device of claim 3, wherein, The buffering assembly (4) includes a stopper sliding along the radial direction of the tank (1), and the liquid flow ejected from the liquid inlet hits the stopper and then falls into the liquid distribution groove.

5. The blow-by gas recovery gas separation device of claim 4, wherein, The driving assembly includes elastic member (53) and transmission rod (54), the elastic member (53) is installed between the connecting rods (522) to make the connecting rods (522) have a tendency to converge, and the transmission rod (54) is hinged with the lifting block (521) and the stopper at both ends.

6. The blow-by gas recovery gas separation device of claim 5, wherein, The shape of the stopper is tile-shaped.

7. The blow-by gas recovery gas separation device of claim 5, wherein, The two sides of the connecting rod (522) are connected with branch rods (5221), so that all the connecting rods (522) and branch rods (5221) form a circular truncated cone cage structure.

8. The blow-by gas recovery gas separation device of claim 1, wherein, The middle part of the rotating plate (51) is provided with a leakage hole, and the leakage hole is provided with a gate assembly.

9. The blow-by gas recovery gas separation device of claim 8, wherein, The gate assembly includes gate (511) rotatingly installed on the upper surface of the leakage hole for blocking the leakage hole and control member for controlling the rotation of the gate (511), when the angle α is less than 47°, the gate (511) is rotated to open the leakage hole.

10. The blow-by gas recovery gas separation device of claim 9, wherein, The control member is a counterweight plate which is fixedly connected at the hinge of the gate plate (511), when the angle of a continuously decreases, the gravity center of the gate plate assembly passes through the vertical plane where the rotating shaft of the rotating plate (51) is located, so that the gate plate (511) rotates relative to the rotating plate (51), the rotating plate (51) is provided with a limiting block (513) for limiting the rotating angle of the gate plate (511) relative to the rotating plate (51), so that the gate plate (511) rotates relative to the rotating plate (51) at most by an angle of 5°-10°.

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