Gas-liquid separator

Abstract

The invention relates to the technical field of gas-liquid separation, and discloses a gas-liquid separator, which comprises a separator main body, a rotary spraying device and a filler, the rotary spraying device and the filler are arranged in the separator main body, the lower wall of the separator main body is provided with a gas inlet and a liquid outlet, the gas inlet is located above the liquid outlet, the top wall of the separator main body is provided with a gas outlet, and the gas outlet is located above the liquid outlet. The rotary spraying device comprises a liquid inlet pipe and a spraying pipe, the liquid inlet pipe is connected with the side wall of the separator body, one end of the liquid inlet pipe is a liquid inlet and extends out of the outer wall of the separator body, the spraying pipe comprises a connecting part and backflushing parts located at the two ends of the connecting part, and the connecting part is rotatably connected with the liquid inlet pipe and communicated with the liquid inlet pipe. The outer wall of at least one backflushing part is provided with spraying holes which are formed obliquely downwards, and the filler is located between the air inlet and the rotary spraying device. According to the gas-liquid separation device, the effect of rotating spraying of the liquid to be treated can be achieved, so that the gas-liquid contact efficiency is improved, and the gas-liquid separation effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas-liquid separation, and in particular to a gas-liquid separator. Background Art

[0002] At present, gas-liquid separators are widely used in petrochemical, energy, environmental protection, pharmaceutical and other fields. According to the operating pressure, they can be divided into normal pressure gas-liquid separators and negative pressure gas-liquid separators. According to the liquid distribution medium, they can be divided into plate type gas-liquid separators and packing type gas-liquid separators.

[0003] According to Henry's law, the solubility of gas in liquid is proportional to the equilibrium partial pressure of the gas in the gas phase, that is, the solubility of gas in liquid tends to decrease with the decrease of external pressure. Therefore, reducing the pressure inside the gas-liquid separator is conducive to the smooth progress of the gas-liquid separation process. That is, the negative pressure gas-liquid separator has a higher gas-liquid separation efficiency than the normal pressure gas-liquid separator.

[0004] Most existing vacuum degassing devices are intermittent reactors, while gas-liquid separators are usually continuous flow reactors. Therefore, how to construct a gas-liquid separator with internal vacuum and continuous flow is the key to the problem. Patent CN110812895A discloses a continuous low-pressure gas-liquid separation device, in which liquid dissolved with gas enters the device from the top, is sprayed onto the tower plate structure through a fixed spray head, flows to the bottom of the device and is pumped out of the gas-liquid separation device by a liquid outlet device. The invention takes into account both vacuum negative pressure and continuous flow. The liquid spray head used is a fixed structure, and the liquid is evenly distributed through the tower plate. The tower plate structure is a common structure for liquid distribution in a gas-liquid separator, which is easy to design and install, but the packing structure theoretically has a larger gas-liquid contact area. Maximizing the gas-liquid contact efficiency of the packing has always been a difficult problem in the industry. For this reason, people have invented various types of packing, mainly including bulk packing and structured packing. Bulk packing is simple to install, but it is very easy to cause local concentration of liquid distribution, so it is necessary to set a liquid redistributor in the middle of the gas-liquid separator. The structured packing has the characteristic of its own flow-guiding structure, which can achieve a more uniform liquid distribution. However, the uniform distribution of liquid in the structured packing still depends on the uniformity of the spray hole setting.

[0005] In fact, the spray holes of the vast majority of current gas-liquid separators are of fixed structures. Including patent CN110812895A, this patent adopts a tray-type liquid distribution method, and the liquid is ejected through fixed spray holes to reach the tray. Although it improves the gas-liquid separation efficiency through continuous low-pressure treatment, the operating pressure is only one limiting factor of the gas-liquid separator performance, and the gas-liquid ratio is a more important factor. Improving the spatial uniformity of liquid distribution is an important way to increase the gas-liquid ratio. The liquid distribution mode of the fixed spray head and tray represented by patent CN110812895A has liquid distribution dead angles, and the blockage of individual spray holes will further increase the liquid distribution dead angles. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a gas-liquid separator, which designs the spray head as a rotatable mechanism and uses the reaction force of the liquid ejected from the spray head to drive the rotation of the spray head. In this way, on the one hand, it can greatly increase the spatial uniformity of liquid distribution. On the other hand, if individual spray holes are blocked, the uniformity of liquid spraying will not be lost, and ultimately the long-term continuous maintenance of the liquid spraying uniformity can be achieved, ensuring that the gas-liquid separator maintains a high gas-liquid separation efficiency for a long time. At the same time, the present invention adopts structured packing, and further increases the liquid distribution uniformity through its self-borne flow guiding grooves.

[0007] At the same time, through the pipeline design of the inlet and outlet of water and gas, the present invention also takes into account vacuum negative pressure and continuous flow. The technical solution adopted by the present invention to solve its technical problems is as follows:

[0008] A gas-liquid separator, comprising a separator main body, a rotating spray device and packing arranged inside the separator main body. The lower wall of the separator main body is provided with an air inlet and a liquid outlet, and the air inlet is located above the liquid outlet. The top wall of the separator main body is provided with an air outlet, and the air outlet is used to connect to a vacuum pump. The rotating spray device includes a liquid inlet pipe and a spray pipe. The liquid inlet pipe is connected to the side wall of the separator main body, and one end thereof is a liquid inlet and extends out of the outer wall of the separator main body. The spray pipe includes a connecting portion and reaction portions located at both ends of the connecting portion. The connecting portion is rotatably connected to the liquid inlet pipe and is communicated with the liquid inlet pipe. At least one outer wall of the reaction portion is provided with spray holes arranged obliquely downward. The packing is located between the air inlet and the rotating spray device.

[0009] Preferably, a first three-way fitting is arranged in the middle of the liquid inlet pipe, and a second three-way fitting is arranged on the connecting portion. The first three-way fitting and the second three-way fitting are connected through a rotating assembly.

[0010] Preferably, the rotating assembly includes a fixed pipe connected to the first three-way fitting and a moving pipe connected to the second three-way fitting, and the other end of the moving pipe is rotatably connected to the other end of the fixed pipe.

[0011] Preferably, a stator is provided at the lower end of the fixed pipe, a rotor is provided at the lower end of the moving pipe, and the rotor and the stator are connected by a bearing.

[0012] Preferably, the upper end of the rotor is sleeved on the fixed pipe and abuts against the stator. The bearing is arranged inside the rotor, the inner ring of the bearing is connected to the stator, and the outer ring of the bearing is connected to the rotor.

[0013] Preferably, spray holes are provided on both of the two backwashing parts, and the midpoint of the axis of the connecting part is the center point, and the spray holes on the two backwashing parts are rotationally symmetric about the center point.

[0014] Preferably, a plurality of the spray holes are provided on each of the backwashing parts, and the plurality of spray holes extend along the length direction of the backwashing part.

[0015] Preferably, the included angle between the center line of the spray hole and the vertical line is a, and the value range of a is 15 to 90°.

[0016] Preferably, a third three-way fitting is provided at the air outlet, a vacuum gauge is arranged in one outlet of the third three-way fitting, an air outlet pipe is arranged in the other outlet of the third three-way fitting, and the other end of the air outlet pipe is used for connecting a vacuum pump.

[0017] Preferably, it includes a base, and the separator main body is supported on the base.

[0018] Compared with the prior art, a gas-liquid separator according to an embodiment of the present invention has the beneficial effects that: by arranging a rotating spray device inside the separator main body, the connecting part of the spray pipe is rotatably connected to the liquid inlet pipe and is communicated with the liquid inlet pipe, and at the same time, spray holes are provided on the outer wall of at least one backwashing part of the spray pipe and are arranged obliquely downward. During operation, the vacuum pump continuously pumps air from the air extraction port, creating a negative pressure environment inside the separator main body. The liquid to be treated enters the rotating spray device from the liquid inlet, sprays out through the spray holes, forming a backwashing effect, causing the spray pipe of the rotating spray device to rotate, so that the liquid to be treated achieves the effect of rotating spraying, greatly increasing the uniformity of liquid distribution, thereby increasing the gas-liquid contact efficiency. In the negative pressure environment inside the separator, the gas dissolved in the liquid has a higher desorption degree. At the same time, external air continuously enters the gas-liquid separator from the air inlet on the lower wall of the separator main body, realizing gas-liquid countercurrent with the sprayed liquid, thereby taking away the gas desorbed from the liquid and achieving gas-liquid separation. Description of the Drawings

[0019] Figure 1 This is a schematic structural view of the gas-liquid separator of the present invention.

[0020] Figure 2 This is the front view of the rotating spraying device of the present invention.

[0021] Figure 3 This is the axonometric view of the rotating spraying device of the present invention.

[0022] Figure 4 This is the sectional view of the rotating spraying device of the present invention.

[0023] Figure 5 This is the sectional view of the spray pipe of the present invention.

[0024] Wherein: 1 - separator main body, 11 - air inlet, 12 - liquid outlet, 2 - rotating spraying device, 21 - liquid inlet pipe, 211 - liquid inlet, 22 - spray pipe, 221 - spray hole, 23 - first three-way piece, 24 - second three-way piece, 25 - fixed pipe, 26 - moving pipe, 27 - stator, 28 - rotor, 29 - bearing, 3 - packing, 4 - third three-way piece, 5 - vacuum gauge, 6 - air outlet pipe, 7 - base. Specific Embodiments

[0025] The following combines the accompanying drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0027] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Such asFigures 1-4 As shown in the figure, an air-liquid separator according to a preferred embodiment of the present invention includes a separator main body 1, a rotating spray device 2 and a packing 3 disposed inside the separator main body 1. The lower wall of the separator main body 1 is provided with an air inlet 11 and a liquid outlet 12, and the air inlet 11 is located above the liquid outlet 12. The top wall of the separator main body 1 is provided with an air outlet for connecting to a vacuum pump. The rotating spray device 2 includes a liquid inlet pipe 21 and a spray pipe 22. The liquid inlet pipe 21 is connected to the side wall of the separator main body 1, and one end thereof is a liquid inlet 211 extending out of the outer wall of the separator main body 1. The other end of the liquid inlet pipe 21 is closed and passes through the side wall of the separator main body 1.

[0029] The spray pipe 22 includes a connecting portion and backwashing portions located at both ends of the connecting portion. The connecting portion is rotatably connected to the liquid inlet pipe 21 and is in communication with the liquid inlet pipe 21. At least one outer wall of the backwashing portion is provided with spray holes 221 disposed obliquely downward. The packing 3 is located between the air inlet 11 and the rotating spray device 2. At the same time, in order to prevent the separator main body 1 from directly contacting the ground and causing damage, a base 7 can also be provided, and the separator main body 1 is supported on the base 7.

[0030] A liquid inlet pump is installed at the liquid outlet 12 to continuously extract the separated liquid, so as to realize continuous degassing treatment of the liquid flowing through the air-liquid separator.

[0031] Based on the above technical features, in the air-liquid separator, by providing a rotating spray device 2 inside the separator main body 1, the connecting portion of the spray pipe 22 is rotatably connected to the liquid inlet pipe 21 and is in communication with the liquid inlet pipe 21. At the same time, at least one outer wall of the backwashing portion of the spray pipe 22 is provided with spray holes 221 disposed obliquely downward. During operation, the vacuum pump continuously pumps air at the air extraction port, creating a negative pressure environment inside the separator main body 1. The liquid to be treated enters the rotating spray device 2 from the liquid inlet 211 and is sprayed out through the spray holes 221, forming a backwashing effect, causing the spray pipe 22 of the rotating spray device 2 to rotate, so as to achieve the effect of rotating spraying of the liquid to be treated, greatly increasing the uniformity of liquid spraying, thereby increasing the spreading degree of the liquid on the packing 3 and increasing the air-liquid contact efficiency.

[0032] Please refer to the appendix Figures 2-4, in this embodiment, for the convenience of connecting the liquid inlet pipe 21 and the spray pipe 22, a first three-way fitting 23 is provided in the middle of the liquid inlet pipe 21, and a second three-way fitting 24 is provided on the connecting portion. That is, two of the interfaces of the first three-way fitting 23 are respectively connected to the liquid inlet pipe 21, so that the liquid inlet pipe 21 is divided into two sections, which are respectively connected to the two interfaces of the first three-way fitting 23. Similarly, the connecting portion is also divided into two sections, which are respectively connected to the two interfaces of the second three-way fitting 24. In actual setting, each section of the connecting portion can be integrated with the corresponding backwashing portion, that is, a single pipe. That is, each of the two interfaces of the second three-way fitting 24 is connected to a pipe, and the pipe includes a backwashing portion and a part of the connecting portion. It can also be that the second three-way fitting 24 directly replaces the connecting portion, and its two opposite interfaces are respectively connected to a backwashing portion.

[0033] The other interface of the first three-way fitting 23 is connected to the other interface of the second three-way fitting 24 through a rotating assembly to realize the rotation of the spray pipe 22. Specifically, the rotating assembly includes a fixed pipe 25 connected to the first three-way fitting 23 and a moving pipe 26 connected to the second three-way fitting 24. The other end of the moving pipe 26 is rotatably connected to the other end of the fixed pipe 25, so as to drive the backwashing portion to rotate around the axis of the fixed pipe 25 through the moving pipe 26.

[0034] In this embodiment, a stator 27 is provided at the lower end of the fixed pipe 25, a rotor 28 is provided at the lower end of the moving pipe 26, and the rotor 28 is connected to the stator 27 through a bearing 29, so as to realize the rotation of the moving pipe 26 relative to the fixed pipe 25 through the bearing 29. Specifically, the upper end of the rotor 28 is sleeved on the fixed pipe 25 and abuts against the stator 27, so as to prevent the separation between the rotor 28 and the stator 27. The bearing 29 is arranged inside the rotor 28, the inner ring of the bearing 29 is connected to the stator 27, the outer ring of the bearing 29 is connected to the rotor 28, and different from the inner ring of the bearing 29, the rotor 28 is sleeved on the outer ring of the bearing 29 to realize rotation.

[0035] In this embodiment, the spray holes 221 can be provided only on one of the backwashing portions, or can be provided on both of the backwashing portions. Preferably, the spray holes 221 are provided on both of the backwashing portions, and the midpoint of the axis of the connecting portion is the center point, and the spray holes on the two backwashing portions are rotationally symmetric about the center point. That is, when the spray holes on one of the backwashing portions are rotated by 180 degrees, they completely coincide with the spray holes 221 on the other backwashing portion when not rotated. Under the action of the two groups of spray holes 221, the rotation speed and stability can be further improved, and the uniformity of liquid spraying can also be further ensured.

[0036] Please refer to the attached Figure 5 , in addition, to further ensure the uniformity of liquid spraying, a number of the spray holes 221 are provided on each of the backwashing parts, and the number of the spray holes 221 extends along the length direction of the backwashing part. At the same time, the included angle between the center line of the spray hole 221 and the vertical line is a, and the value range of a is 15-90°, such as 20°, 22°, 25°, 30°, 32°, 35°, 36°, 37°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 51°, 55°, 60°, 65°, 70°, 75°, 80°, 82°, 85°, 88°, etc., or any value or any range between any two of the above values. Among them, the value of a is preferably 45°. By arranging the spray hole 221 obliquely downward, a better backwashing effect can be achieved, thereby increasing the rotation speed of the spray pipe 22, further increasing the uniformity of liquid spraying, increasing the gas-liquid contact efficiency, and ensuring the best gas-liquid separation effect. And by selecting the angle of the spray hole 221 within the range of 40-50°, it can also ensure that the liquid ejected from the spray hole 221 has a higher speed, thereby improving the relative action with the packing 3, and further ensuring a better gas-liquid separation effect.

[0037] In this application, the intake speed of the intake port 11 needs to be less than the gas discharge speed of the gas extraction port of the vacuum pump to ensure a negative pressure environment is formed inside the separator main body 1, reduce the solubility of gas in the liquid, and thus enhance the gas-liquid separation effect. At the same time, for convenient real-time monitoring, a third three-way piece 4 is provided on the outlet, a vacuum gauge 5 is provided inside the upper end outlet of the third three-way piece 4, a gas outlet pipe 6 is provided on the side wall outlet of the third three-way piece 4, and the other end of the gas outlet pipe 6 is used to connect to the vacuum pump. The vacuum gauge is electrically connected to the vacuum pump and the intake device. Thus, it is realized that the vacuum degree inside the separator main body 1 is detected in real time through the vacuum gauge 5, and then the intake rates of the vacuum pump and the intake device are controlled in real time to ensure that the inside of the separator main body 1 has the best vacuum degree, thereby ensuring the best gas-liquid separation effect.

[0038] In this application, the first three-way piece 23, the second three-way piece 24, and the third three-way piece 4 can all directly adopt three-way valves.

[0039] In summary, this application can realize the dynamic distribution of liquid by relying on the backwashing action of the liquid itself. In addition, the liquid to be treated is fed by a liquid feed pump, and the liquid feed pump and the vacuum pump are simultaneously controlled by an external circuit, and continuous dynamic negative pressure degassing treatment of the liquid is realized through the linkage of the vacuum pump and the liquid feed pump.

[0040] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A gas-liquid separator, characterized in that: It includes a separator main body, a rotating spray device and a packing arranged inside the separator main body. The lower wall of the separator main body is provided with an air inlet and a liquid outlet, and the air inlet is located above the liquid outlet. The top wall of the separator main body is provided with an air outlet, and the air outlet is used to connect to a vacuum pump. The rotating spray device includes a liquid inlet pipe and a spray pipe. The liquid inlet pipe is connected to the side wall of the separator main body, and one end thereof is a liquid inlet, extending out of the outer wall of the separator main body. The spray pipe includes a connecting portion and backwashing portions located at both ends of the connecting portion. The connecting portion is rotatably connected to the liquid inlet pipe and is in communication with the liquid inlet pipe. The outer wall of at least one of the backwashing portions is provided with spray holes arranged obliquely downward. The packing is located between the air inlet and the rotating spray device.

2. The gas-liquid separator according to claim 1, wherein: A first three-way piece is arranged in the middle of the liquid inlet pipe, and a second three-way piece is arranged on the connecting portion. The first three-way piece and the second three-way piece are connected by a rotating assembly.

3. The gas-liquid separator according to claim 2, wherein: The rotating assembly includes a fixed pipe connected to the first three-way piece and a moving pipe connected to the second three-way piece. The other end of the moving pipe is rotatably connected to the other end of the fixed pipe.

4. The gas-liquid separator according to claim 3, wherein: A stator is arranged at the lower end of the fixed pipe, and a rotor is arranged at the lower end of the moving pipe. The rotor and the stator are connected by a bearing.

5. The gas-liquid separator according to claim 4, wherein: The upper end of the rotor is sleeved on the fixed pipe and abuts against the stator. The bearing is arranged inside the rotor, and the inner ring of the bearing is connected to the stator, and the outer ring of the bearing is connected to the rotor.

6. The gas-liquid separator according to any one of claims 1-5, characterized in that: Spray holes are arranged on both of the two backwashing portions, and the midpoint of the axis of the connecting portion is the center point. The spray holes on the two backwashing portions are rotationally symmetric about the center point.

7. The gas-liquid separator according to claim 6, characterized in that: A plurality of the spray holes are arranged on each of the backwashing portions, and the plurality of spray holes extend along the length direction of the backwashing portion.

8. The gas-liquid separator according to any one of claims 1-5, characterized in that: The included angle between the center line of the spray hole and the vertical line is a, and the value range of a is 15 to 90°.

9. The gas-liquid separator according to any one of claims 1-5, characterized in that: A third three-way piece is arranged on the air outlet. A vacuum gauge is arranged in one outlet of the third three-way piece, and an air outlet pipe is arranged in the other outlet of the third three-way piece. The other end of the air outlet pipe is used to connect to a vacuum pump.

10. The gas-liquid separator according to any one of claims 1-5, characterized in that: It includes a base, and the separator main body is supported on the base.

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