Exhaust buffer device
By designing the deflector and multi-layer flow blocking plate structure in the tank, combined with the elastic isolation pad and drain valve assembly, efficient separation and buffering of the gas-liquid mixed flow is achieved, and safety hazards and insufficient buffering in the existing technology are solved, and safe and economical exhaust effect is achieved.
Patent Information
- Application Number
- CN202510683695.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-26
- Publication Date
- 2025-07-18
AI Technical Summary
When the existing gas back pressure compensation device discharges high-pressure gas, it has high-speed injection, equipment vibration and safety risks, and the buffering capacity is insufficient, making it difficult to meet the demand for fast and large-flow exhaust, and complex control systems increase costs.
An exhaust buffer device is designed, including a tank body, a gas-liquid separation device and a drain valve. The gas-liquid separation is achieved by using the deflector plate. Through the structural design of the deflector plate and a multi-layer flow blocking plate, combined with the elastic isolation pad and the drain valve assembly, it can achieve efficient separation and buffering to ensure safe emissions.
It realizes efficient gas-liquid separation and buffering, ensuring smooth discharge of liquid, safe gas emission, reducing flow rate and pressure, compact structure, suitable for space-constrained occasions and reducing costs.
Smart Images
Figure CN120331714A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of compressed gas equipment, and particularly relates to an exhaust buffering device. Background Art
[0002] With the development and increasing perfection of the controlled-pressure cementing technology, the gas backpressure compensation device has been widely used, that is, by supplementing or discharging high-pressure gas into the wellbore to keep the bottom-hole pressure stable within a narrow safe density window, ensuring that there is no well kick or well leakage, and preventing safety or cementing quality accidents during the cementing process. However, during use, when the existing gas backpressure compensation device needs to reduce pressure after supplementing a large amount of high-pressure gas, it is necessary to directly discharge the high-pressure gas up to several megapascals and possibly a small amount of cementing slurry in a few seconds. The ejection velocity of the ejecta at the discharge port can exceed 100 m / s and the volume is large, which not only causes equipment vibration and explosion noise, but also poses certain safety hazards, environmental pollution and mess.
[0003] Due to strict requirements for the pressure relief speed, it is not appropriate to use the usual throttling measures to reduce the outlet flow rate or velocity of the gas backpressure compensation device. The existing so-called buffering devices have insufficient buffering capacity and are difficult to meet the exhaust requirements of rapid large flow rates. Moreover, some buffering devices require complex control systems, increasing the use cost. Therefore, a special device is needed to buffer the high-pressure fluid at the outlet of the gas backpressure compensation device and then discharge it safely. Summary of the Invention
[0004] In order to achieve the safe discharge of the large-flow velocity gas-liquid mixed flow at the outlet of the gas backpressure compensation device, the present invention provides an exhaust buffering device.
[0005] The exhaust buffering device according to the present invention includes: a tank body, including a tank body, an upper cover detachably connected to the upper opening of the tank body, and a lower cover detachably connected to the lower opening of the tank body. An inlet is horizontally provided at the lower part of the tank body, an exhaust port is provided at the top end of the upper cover, and a slurry discharge port is provided at the bottom end of the lower cover; a gas-liquid separation device, including a deflector fixed in the tank body, the deflector is used for dividing the jet flow from the inlet into two reverse swirl flows, so that the liquid droplets in the jet flow are thrown towards the inner wall of the tank body due to centrifugal force and settle under the action of gravity, while the gas in the jet flow flows upward; a liquid discharge valve, including an elastic isolation pad circumferentially and sealingly connected to the inner wall of the lower cover and a liquid discharge valve assembly connected between the elastic isolation pad and the slurry discharge port. The elastic isolation pad is configured to open the liquid discharge valve assembly in the initial state, so that the slurry discharge port is opened, and when the pressure in the tank body is greater than a preset value, it moves towards the slurry discharge port to close the liquid discharge valve assembly, thereby closing the slurry discharge port, and a gas buffering device, located above the gas-liquid separation device, is used for colliding and decelerating the gas in the jet flow and then safely discharging it through the exhaust port.
[0006] Further, the liquid discharge valve assembly includes a liquid discharge valve core fixedly connected to the elastic isolation pad and a compression spring connected to the lower end of the liquid discharge valve core. The compression spring is disposed between the liquid discharge valve core and the inner wall of the liquid discharge port. A liquid discharge port is formed on the liquid discharge valve core. In the initial state, the liquid discharge port is communicated with the interior of the tank body. When the pressure in the tank body is greater than a preset value, the elastic isolation pad moves towards the liquid discharge port to drive the liquid discharge valve core to move downward, so that the liquid discharge port is closed by the inner wall of the liquid discharge port.
[0007] Further, the liquid discharge port includes a liquid discharge hole radially formed in the middle of the liquid discharge valve core and an auxiliary liquid discharge hole axially formed in the lower part of the liquid discharge valve core and communicated with the liquid discharge hole. The auxiliary liquid discharge hole is communicated with the liquid discharge port.
[0008] Further, holes are formed on the elastic isolation pad for leaking the liquid droplets separated by the gas-liquid separation device to the liquid discharge valve core. A folding ring is further formed at the bottom of the elastic isolation pad to facilitate the extension and rebound of the elastic isolation pad.
[0009] Further, the flow guiding plate is configured as a herringbone metal plate, and the tip of the herringbone metal plate faces the inlet and is disposed directly opposite to the center of the inlet.
[0010] Further, the gas buffer device includes a counterflush device. The counterflush device includes a bottom plate fixedly connected to the inner wall of the tank body and at least a pair of elbows fixed on the bottom plate. The outlets of each pair of elbows are disposed directly opposite to each other, or the outlets of each pair of elbows face the bottom plate.
[0011] Further, the gas buffer device further includes a plurality of flow blocking plates located above the counterflush device. A support rod is fixed on the bottom wall of the upper cover, and each flow blocking plate is fixedly spaced below the upper cover through the support rod.
[0012] Further, a plurality of exhaust holes are formed on each flow blocking plate, and the positions of the exhaust holes between adjacent layers are staggered.
[0013] Further, the total area of the exhaust holes of each flow blocking plate decreases layer by layer from bottom to top.
[0014] Further, the nominal diameter of the tank body is more than six times the nominal diameter of the inlet, and the ratio of the height to the diameter of the tank body is 2:1 to 3:1.
[0015] Through a unique structural design, the exhaust buffer device of the present invention realizes the efficient separation and buffering of high-pressure and high-flow-rate gas-liquid mixed flows. Compared with the prior art, its advantages are as follows:
[0016] 1) Efficient gas-liquid separation and precise pressure control: The flow guiding plate divides the jet into two reverse swirls, and uses centrifugal force to throw the liquid droplets towards the inner wall of the tank body for sedimentation, while the gas flows upward. The liquid discharge valve can keep the liquid discharge channel unblocked when the pressure in the tank is low, and automatically close the liquid discharge port when the pressure is too high, ensuring the smooth discharge of the liquid while preventing gas leakage and ensuring safety.
[0017] 2) Sufficient energy dissipation and safe discharge: The gas buffer device enables the gas to collide, expand, and depressurize fully through counter - impact and multi - stage flow resistance, reducing the flow rate and pressure to ensure the safe discharge of the gas. The counter - impact device makes the gas collide with each other to consume energy; the multi - layer flow - resistance plates further throttle and depressurize the gas, making the gas discharge pressure lower than 0.4 MPa and the speed not exceeding 10 m / s.
[0018] 3) Compact structure and strong applicability: The nominal diameter of the tank body is more than six times the inlet diameter, and the height - to - diameter ratio is 2:1 to 3:1, providing sufficient separation and buffering space. At the same time, it ensures the structural stability and compactness, and is suitable for occasions with limited space, such as offshore drilling platforms. The overall design does not require a large tank body or a complex control system, reducing the usage cost. Description of the Drawings
[0019] Figure 1 It is a front - view sectional schematic diagram of the structure of the exhaust buffer device according to an embodiment of the present invention;
[0020] Figure 2 is Figure 1 an enlarged view of the drain valve shown;
[0021] Figure 3 is Figure 1 a schematic diagram of the structure of the guide plate along the A - A direction shown;
[0022] Figure 4 is Figure 1 a schematic diagram of the structure of the flow - resistance plate shown;
[0023] Figure 5 is Figure 1 a schematic diagram of the structure of the upper cover shown. Detailed Embodiments
[0024] In order to better understand the purpose, structure, and function of the present invention, the present invention will be further described in detail below with reference to the drawings.
[0025] Figure 1 shows the structure of the exhaust buffer device 100 according to an embodiment of the present invention. Combining Figure 1 and Figure 2As shown, the exhaust buffer device 100 may include: a tank body, including a tank body 1, an upper cover 2 detachably connected to the upper end opening of the tank body 1, and a lower cover 3 detachably connected to the lower end opening of the tank body. An inlet 101 is horizontally provided at the lower part of the tank body, an exhaust port 201 is provided at the top end of the upper cover 2, and a slurry discharge port 301 is provided at the bottom end of the lower cover 3; a gas-liquid separation device 4, including a baffle 401 fixed inside the tank body. The baffle 401 is used to divide the jet flow from the inlet 101 into two reverse swirl flows, so that the liquid droplets in the jet flow are thrown towards the inner wall 402 of the tank body due to centrifugal force and settle under the action of gravity, while the gas in the jet flow flows upward; a liquid discharge valve 5, including an elastic isolation pad 501 circumferentially and sealingly connected to the inner wall of the lower cover 3 and a liquid discharge valve assembly connected between the elastic isolation pad 501 and the slurry discharge port 301. The elastic isolation pad 501 is configured to open the liquid discharge valve assembly in the initial state so that the slurry discharge port 301 is opened, and move towards the slurry discharge port 301 when the pressure in the tank body is greater than a preset value to close the liquid discharge valve assembly, thereby closing the slurry discharge port 301, and a gas buffer device 6, located above the gas-liquid separation device 4, is used to collide and decelerate the gas in the jet flow and then safely discharge it through the exhaust port 201.
[0026] In the exhaust buffer device 100 of the embodiment of the present invention, the upper cover 2 and the lower cover 3 can be detachably connected by flanges, which is convenient for the installation, maintenance and cleaning of the upper cover 2, the lower cover 3 and the internal devices (such as the baffle 401, the liquid discharge valve 5 and the gas buffer device 6). The gas-liquid separation device 4 includes a baffle 401, which divides the jet flow from the inlet 101 into two horizontal reverse swirl flows, prompting the liquid droplets to be centrifugally thrown towards the inner wall of the tank body 1 and settle, while the gas flows upward. The setting of the baffle 401 realizes the efficient separation of gas and liquid. The liquid discharge valve 5 includes an elastic isolation pad 501 and a liquid discharge valve assembly. In the initial state, the slurry discharge port 301 is opened, and when the pressure in the tank is too high, the liquid discharge valve assembly closes the slurry discharge port 301. The setting of the liquid discharge valve 5 realizes the automatic control of liquid discharge, keeps the liquid discharge channel unblocked when the pressure in the tank is low, and ensures that the liquid can be discharged smoothly; when the pressure in the tank is high, it automatically closes the liquid discharge port to prevent gas leakage, improving the safety and reliability of the device. The gas buffer device 6 makes the separated gas collide and consume energy, reduces the flow rate, enhances the buffering effect, and ensures the safe discharge of the gas.
[0027] In such as Figure 1 and Figure 2In the preferred embodiment shown, the liquid discharge valve assembly may include a liquid discharge valve core 503 fixedly connected to an elastic isolation pad 501 and a compression spring 506 connected to the lower end of the liquid discharge valve core 503. The compression spring 506 is arranged between the liquid discharge valve core 503 and the inner wall of the slurry discharge port 301. A liquid discharge port is formed on the liquid discharge valve core 503. In the initial state, the liquid discharge port is communicated with the inside of the tank body. When the pressure in the tank body is greater than a preset value, the elastic isolation pad 501 moves towards the slurry discharge port 301 to drive the liquid discharge valve core 503 to move downward so that the liquid discharge port is closed by the inner wall of the slurry discharge port 301. In this embodiment, when the isolation pad 501 is not pressurized or is under a relatively small safety pressure, due to the dual return elastic forces of the compression spring 506 and the elastic isolation pad 501, the liquid discharge port exposes the inner end face of the slurry discharge port 301, and the liquid discharge channel can be kept unblocked. On the contrary, when the elastic isolation pad 501 is under a greater pressure, the liquid discharge valve core 503 moves downward to close the liquid discharge port. The compression spring 506 and the elastic isolation pad 501 cooperate to achieve "closing the valve under high pressure and opening the valve under low pressure", without external control, and the reliability is higher. Especially when under high pressure, the liquid discharge port is completely closed, effectively preventing gas from escaping from the slurry discharge port 301, thus ensuring the safety of discharge.
[0028] As Figure 2 shown, the elastic isolation pad 501 is preferably but not limited to a bowl-shaped elastic rubber pad, with a round hole 5010 in the middle, which can be clamped with the liquid discharge valve core 503 through upper and lower flat gaskets 504 and an anti-loosening nut 505 to form a sealed connection. The elastic isolation pad 501 can be fixed through a sealing pressure ring 502. The sealing pressure ring 502 is preferably a ring-shaped steel structure, and the outer periphery of the elastic isolation pad 501 is pressed against the inner wall of the lower cover 3 by bolts to form an airtight connection.
[0029] In the preferred embodiment as Figure 2 shown, the liquid discharge port may include a liquid discharge hole 5031 radially formed in the middle of the liquid discharge valve core 503 and an auxiliary liquid discharge hole 50 axially formed in the lower part of the liquid discharge valve core 503 and communicated with the liquid discharge hole 5031. The auxiliary liquid discharge hole 50 is communicated with the slurry discharge port 301. In practical applications, when the pressure in the tank is ≥0.2 MPa, the compression spring 506 compresses to completely close the liquid discharge hole 5031 by the slurry discharge port 301; when the pressure in the tank is <0.2 MPa, the liquid discharge hole 5031 is completely exposed to the inner end face of the slurry discharge port 301, realizing liquid discharge without resistance. Obviously, when the pressure is between 0 and 0.2 MPa, the liquid discharge valve core 503 is in a state of discharging a small amount of liquid (or a gas-liquid mixture), but safety can be ensured at this time.
[0030] In the preferred embodiment as Figure 2In the preferred embodiment shown, a hole 5011 for leaking the liquid droplets separated by the gas-liquid separation device 4 to the drain valve core 503 is formed on the elastic isolation pad 501, and a folding ring 5012 facilitating the extension and rebound of the elastic isolation pad 501 is further formed at the bottom of the elastic isolation pad 501. When the elastic isolation pad 501 is under a relatively large pressure, the elastic isolation pad 501 extends downward under the action of the upper and lower pressure difference and drives the drain valve core 503 to move downward together to fit against the inner wall of the lower cover 3, so that the outlet of the hole 5011 is blocked and the drain hole 5031 completely enters the slurry discharge port 301 to close the drain port; the setting of the folding ring 5012 is used to improve the deformation recovery ability of the elastic isolation pad 501, extend its service life while ensuring its own performance.
[0031] According to the present invention, in the preferred embodiment as shown in Figure 1 and Figure 3 In the preferred embodiment shown, the flow guide plate 401 can be configured as a herringbone metal plate, and the tip of the herringbone metal plate faces the inlet 101 and is set directly opposite the center of the inlet 101. The tip of the herringbone metal plate is directly opposite the center of the jet flow, which can ensure the symmetrical splitting of the air flow, enhance the separation effect, improve the separation efficiency, and reduce the energy loss. Its metal material is resistant to high-pressure impact and is not easily deformed during long-term use.
[0032] In the preferred embodiment as shown in Figure 1 In the preferred embodiment shown, the gas buffer device 6 can include a counter-impact device. The counter-impact device can include a bottom plate 601 fixedly connected to the inner wall of the tank body and at least a pair of elbows 602 fixed on the bottom plate 601. The outlets of each pair of elbows 602 are directly opposite to each other, or the outlets of each pair of elbows 602 face the bottom plate 601. The setting of this embodiment enables the gas to undergo counter-impact collisions, consume a large amount of energy, effectively reduce the gas flow rate, enhance the buffering effect, and ensure the safe discharge of the gas.
[0033] In a preferred embodiment, the number of pairs of elbows 602 can be two pairs to achieve efficient buffering in a limited space.
[0034] In another preferred embodiment, the nominal diameter of the elbow 602 is not less than the pipe diameter of the inlet 101. The large-diameter elbow 602 can adapt to a relatively large gas flow rate. When the flow rate at the inlet 101 is large, it ensures that the gas can smoothly pass through the elbow 602 and participate in the counter-impact buffering process, without causing excessive resistance or blockage of the gas at the elbow 602 due to the too small diameter of the elbow 602, and ensuring the stable operation of the device under different working conditions. At the same time, it can also reduce the wear caused by the high-speed gas flow impacting the inner wall of the elbow 602, improve the service life of the elbow, and reduce the maintenance cost and replacement frequency of the device.
[0035] In the preferred embodiment as shown in Figure 1In the preferred embodiment shown, the gas buffer device 6 may further include a multi-layer baffle 7 located above the impact device. A support rod 703 may be fixed to the bottom wall of the upper cover 2, and each baffle 7 may be fixedly spaced below the upper cover 2 through the support rod 703. The design of the multi-layer baffle 7 causes the gas to collide and throttle multiple times when passing through, further reducing the gas pressure and flow rate, enhancing the buffering effect, and having a simple structure, being easy to manufacture and install.
[0036] Preferably, as Figure 4 and Figure 5 shown, each baffle 7 and the upper cover 2 are both provided with fixing holes 702 for passing through the support rod 703.
[0037] In the preferred embodiment shown in Figure 4 , multiple exhaust holes 701 may be opened on each baffle 7, and the positions of the exhaust holes 701 between adjacent layers are staggered. The staggered arrangement of the exhaust holes 701 enables the gas to generate a more complex flow path when flowing between layers, increasing the number of collisions between the gas and the baffle 7, further improving the energy dissipation effect, and reducing the discharge speed and pressure.
[0038] Furthermore, the total area of the exhaust holes 701 of each baffle 7 may gradually decrease from bottom to top. The gradually decreasing total area of the exhaust holes causes the gas to be gradually subjected to a greater throttling effect during the rising process, enabling the pressure and flow rate to decrease more stably, ensuring that the gas is finally discharged at a safe speed and pressure. Preferably, the decreasing ratio for each layer is 20%-30%.
[0039] In the preferred embodiment shown in Figure 1 , Figure 4 and Figure 5 , the upper cover 2 may also serve as a baffle. The position of the exhaust port 201 on the upper cover 2 and the exhaust holes 701 on the adjacent baffle 7 are staggered, and the exhaust port 201 may be connected to a large-diameter discharge pipe. The total area of the exhaust holes 701 of each baffle 7 and the upper cover 2 may gradually decrease from bottom to top.
[0040] In the preferred embodiment shown in Figure 1 , the nominal diameter of the tank body 1 may be more than six times the nominal diameter of the inlet 101, and the height-to-diameter ratio of the tank body is preferably 2:1 to 3:1. The larger tank body diameter and the appropriate height-to-diameter ratio provide sufficient space for the gas-liquid mixed flow to separate and buffer, while ensuring the structural stability and compactness of the device, making it suitable for occasions with limited space.
[0041] Preferably, in order to stabilize the tank body and reduce the load on the inlet pipeline, a support or pedestal with an appropriate height may also be configured for the tank body. Further, the height of the support is preferably 1 / 5 to 1 / 3 of the total height of the tank body, which is used to better disperse the load on the inlet pipeline.
[0042] The exhaust buffering device 100 according to the embodiment of the present invention can separate and buffer the gas-liquid mixture with an instantaneous injection speed of up to 100 m / s and a pressure of up to 4 MPa. The slurry is discharged with almost no pressure, the gas discharge pressure is lower than 0.4 MPA, and the speed does not exceed 10 m / s, which can fully ensure the safety of the discharge.
[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.
Claims
1. An exhaust buffering device, characterized in that, Comprising: A tank body, including a tank shell, an upper cover detachably connected to the upper opening of the tank shell, and a lower cover detachably connected to the lower opening of the tank shell. An inlet is horizontally provided at the lower part of the tank shell. An exhaust port is provided at the top end of the upper cover, and a slurry discharge port is provided at the bottom end of the lower cover; A gas-liquid separation device, including a deflector fixed inside the tank shell. The deflector is used to divide the jet flow from the inlet into two reverse swirl flows, so that the liquid droplets in the jet flow are thrown towards the inner wall of the tank shell due to centrifugal force and settle under the action of gravity, while the gas in the jet flow flows upward; A drain valve, including an elastic isolation pad circumferentially and sealingly connected to the inner wall of the lower cover and a drain valve assembly connected between the elastic isolation pad and the slurry discharge port. The elastic isolation pad is configured to open the drain valve assembly in the initial state, so that the slurry discharge port is opened, and when the pressure in the tank body is greater than a preset value, it moves towards the slurry discharge port to close the drain valve assembly, thereby closing the slurry discharge port, and A gas buffer device, located above the gas-liquid separation device, for colliding and decelerating the gas in the jet flow and safely discharging it through the exhaust port.
2. The exhaust buffering device according to claim 1, wherein The drain valve assembly includes a drain valve core fixedly connected to the elastic isolation pad and a compression spring connected to the lower end of the drain valve core. The compression spring is arranged between the drain valve core and the inner wall of the slurry discharge port. A drain port is formed on the drain valve core. In the initial state, the drain port is communicated with the inside of the tank body, and when the pressure in the tank body is greater than a preset value, the elastic isolation pad moves towards the slurry discharge port to drive the drain valve core to move downward so that the drain port is closed by the inner wall of the slurry discharge port.
3. The exhaust buffering device according to claim 2, wherein The drain port includes a drain hole radially formed in the middle of the drain valve core and an auxiliary drain hole axially formed in the lower part of the drain valve core and communicated with the drain hole. The auxiliary drain hole is communicated with the slurry discharge port.
4. The exhaust buffering device according to claim 2, wherein Holes are formed on the elastic isolation pad for leaking the liquid droplets separated by the gas-liquid separation device to the drain valve core. A folding ring is further formed at the bottom of the elastic isolation pad to facilitate the extension and rebound of the elastic isolation pad.
5. The exhaust buffering device according to any one of claims 1 to 4, characterized in that, The deflector is configured as a herringbone metal plate, and the tip of the herringbone metal plate faces the inlet and is set directly opposite the center of the inlet.
6. The exhaust buffering device according to any one of claims 1 to 4, characterized in that The gas buffer device includes a counterflush device. The counterflush device includes a bottom plate fixedly connected to the inner wall of the tank shell and at least a pair of elbows fixed on the bottom plate. The outlets of each pair of elbows are directly opposite, or the outlets of each pair of elbows face the bottom plate.
7. The exhaust buffering device according to claim 6, characterized in that, The gas buffer device further includes multiple layers of baffle plates located above the counterflush device. A support rod is fixed on the bottom wall of the upper cover, and each baffle plate is fixedly spaced below the upper cover through the support rod.
8. The exhaust buffering device according to claim 7, characterized in that, Multiple exhaust holes are formed on each baffle plate, and the positions of the exhaust holes between adjacent layers are staggered.
9. The exhaust buffering device according to claim 8, characterized in that, The total area of the exhaust holes of each baffle plate decreases layer by layer from bottom to top.
10. The exhaust buffering device according to any one of claims 1 to 4, characterized in that, The nominal diameter of the tank shell is more than six times the nominal diameter of the inlet, and the ratio of the height to the diameter of the tank body is 2:1 to 3:1.