A gas-liquid-solid separation device

Abstract

The application discloses a gas-liquid-solid separation device, which comprises a tank body, a gas-liquid flow guide device, a demister and a spraying device which are sequentially arranged in the tank body from bottom to top; the gas-liquid flow guide device comprises a variable-diameter cylinder body which is open at the top and the bottom, so as to realize the flow of gas-liquid phase fluid at a reduced speed; the lower surface of the demister is arranged in a spaced mode with the upper surface of the gas-liquid flow guide device, and a turbulent flow area is formed between the two; the spraying device is used for spraying mineral oil towards the area where the demister is located. The application can increase the turbulent flow capacity of the gas phase fluid, promote the contact and coalescence of liquid drops, reduce the liquid content at the gas phase outlet, and improve the operation stability of the reciprocating compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to a gas-liquid-solid separation device, in particular to a gas-liquid-solid separation device suitable for a polyolefin industry chain. BACKGROUND

[0002] In the propylene bulk polymerization process, the recovery of propylene after polymerization is one of the key units of the process, mainly using the circulating gas reciprocating compressor to pressurize the low-pressure propylene and then cool it to obtain liquid propylene. After long-term use, the reciprocating compressor will have liquid phase and fine powder residues, affecting the running stability of the reciprocating compressor.

[0003] At present, the industry widely uses a separation tank with a demister for gas-liquid-solid separation. During use, the following technical problems exist: 1. After the gas enters the gas-liquid separation tank from the inlet, vortex will be formed at the pipe opening, which indirectly enhances the entrainment effect of mist, affecting the settlement of fine powder and small droplets; 2. After the gas enters the gas-liquid separation tank, the flow pattern is relatively fixed, and the gas flow direction basically does not change, reducing the coalescence and settlement of droplets, and small droplets are directly carried out of the gas-liquid separation tank by the gas; 3. After the droplets and fine powder are carried into the demister by the gas, the larger droplets are intercepted by the wire mesh, increasing the pressure drop and flow rate of the gas at the wire mesh, and the droplets cannot flow out of the wire mesh, and more smaller droplets are carried out of the wire mesh demister. In order to avoid the above problems and realize long-period stable operation of the device, effective measures need to be taken to make more droplets and fine powder settle in the gas-liquid separation tank, avoiding the problems of increased pressure drop and too many droplets being carried out of the gas-liquid separation tank. How to enhance the turbulence of the fluid in the gas-liquid separation tank to promote the coalescence of droplets and fine powder is a key problem.

[0004] Therefore, it is very important to develop a separation tank suitable for gas-liquid phase separation containing solid powder, to reduce the carrying out of fine powder and small droplets from the gas-liquid separation tank, ensure the continuous and stable operation of the compressor, and improve the stable operation of the gas-liquid separation tank. SUMMARY

[0005] Therefore, the present application provides a separation device for gas-liquid-solid separation, which can increase the turbulence of the gas phase fluid, promote the contact coalescence of droplets, reduce the liquid content at the gas phase outlet, and improve the running stability of the reciprocating compressor.

[0006] In view of the above technical problems, the present application provides the following technical solutions:

[0007] A gas-liquid-solid separation device, comprising: a tank body, a gas-liquid flow guide device, a demister and a spraying device installed in the tank body from bottom to top; the gas-liquid flow guide device comprises a variable-diameter cylinder body with upper and lower openings to realize the velocity reduction flow of gas-liquid phase fluid; the lower surface of the demister is spaced apart from the upper surface of the gas-liquid flow guide device, and a turbulent flow region is formed therebetween; the spraying device is used for spraying mineral oil towards the area where the demister is located.

[0008] In some embodiments of the present application, the variable-diameter cylinder of the gas-liquid flow guide device is configured as a cylinder structure that expands from bottom to top, the lower end of the variable-diameter cylinder forms a gas-liquid inlet, the upper end of the variable-diameter cylinder is fixedly connected with the tank body through a horizontally extending annular plate, and a plurality of jet holes are arranged on the annular plate.

[0009] In some embodiments of the present application, a plurality of rows of jet holes are arranged on the annular plate in a radial direction and uniformly arranged in a circumferential direction, and a flow guide plate is arranged on the upper surface of the annular plate in the hole wall area of the jet holes, and the flow guide plate extends obliquely towards the center line direction of the tank body.

[0010] In some embodiments of the present application, the jet holes extend obliquely towards the center line direction of the tank body, the included angle between the extension direction of the jet holes and the vertical direction is 10°-20°, and the area of all the jet holes on the annular plate accounts for 25%-40% of the area of the annular plate.

[0011] In some embodiments of the present application, the side wall of the tank body is provided with a feed inlet, and the feed inlet is in the same horizontal plane as the gas-liquid inlet of the gas-liquid flow guide device.

[0012] In some embodiments of the present application, the variable-diameter cylinder of the gas-liquid flow guide device includes a cylindrical cylinder on the lower side and a circular truncated cone cylinder on the upper side of the cylindrical cylinder.

[0013] In some embodiments of the present application, the lower side of the cylindrical cylinder has a flow guide wall that inclines inwardly and transitions in an arc shape, and the included angle between the extension direction of the flow guide wall and the generatrix of the cylindrical cylinder is 10°-20°.

[0014] In some embodiments of the present application, the inner diameter of the cylindrical cylinder accounts for 45%-55% of the inner diameter of the tank body, and the maximum inner diameter of the circular truncated cone cylinder accounts for 75%-85% of the inner diameter of the tank body.

[0015] In some embodiments of the present application, the spraying device includes a spraying body and fan blades rotatably connected to the spraying body, and the fan blades rotate around the spraying body under the action of a driving device.

[0016] In some embodiments of the present application, the top of the tank body is provided with an exhaust port, the exhaust port is connected with a compressor inlet pipeline, a detection device for detecting the powder content in the gas is arranged on the compressor inlet pipeline, and a control device controls the spraying device to spray mineral oil at a set period according to the signal of the detection device.

[0017] The technical solution of the present application has the following technical effects compared with the prior art:

[0018] The gas-liquid-solid separation device provided by the application has the advantages that the gas-liquid guide device comprises a variable-diameter cylinder body which is open at the top and the bottom, gas flows through the variable-diameter cylinder body and then enters a turbulent flow area and a mist separation area at a relatively stable low flow rate, the spraying device is used for spraying mineral oil towards the area where the demister is located, more fine powder and liquid droplets can be intercepted by the demister and the spraying device, and a better gas-liquid separation effect is achieved. Meanwhile, gas-phase fluid carrying the mineral oil into the compressor can also lubricate the compressor. The gas-liquid-solid separation device is used for removing liquid and solid phases before the reciprocating compressor, the flow rate of the gas-phase fluid is changed to strengthen the coalescence and sedimentation of liquid droplets and fine powder, the gas-liquid guide device is used for guiding the liquid droplets and fine powder into the liquid phase space, the liquid droplet removal effect is improved, and the operation stability of the reciprocating compressor is improved, which is beneficial to long-time operation of the device. BRIEF DESCRIPTION OF DRAWINGS

[0019] The preferred embodiments of the application will be described in detail below with the help of the accompanying drawings, which will help to understand the purposes and advantages of the application, in which:

[0020] Figure 1 FIG. 1 is a structural schematic diagram of a specific embodiment of the gas-liquid-solid separation device of the application;

[0021] Figure 2 FIG. 2 is a schematic diagram of a specific embodiment of the gas-liquid guide device in the gas-liquid-solid separation device of the application;

[0022] Figure 3 FIG. 3 is a top view of a specific embodiment of the annular plate in the gas-liquid-solid separation device of the application;

[0023] Figure 4 FIG. 4 is a sectional view of a specific embodiment of the annular plate in the gas-liquid-solid separation device of the application;

[0024] Figure 5 FIG. 5 is a schematic diagram of a specific embodiment of the spraying device in the gas-liquid-solid separation device of the application. DETAILED DESCRIPTION

[0025] The technical solutions of the application will be described in detail below with the help of the accompanying drawings, obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict.

[0029] As Figure 1 The present application is a specific embodiment of a gas-liquid-solid separation device for removing liquid and solid impurities installed on the inlet pipeline of a circulating gas reciprocating compressor. It comprises a tank body 100, a gas-liquid flow guide device 10, a demister 20 and a spraying device 30 installed in the tank body 100 from bottom to top; the gas-liquid flow guide device 10, the demister 20 and the spraying device 30 are arranged at intervals, which divide the tank body 100 into liquid phase zone 100a, variable speed zone 100b, turbulent zone 100c and mist separation zone 100d arranged from top to bottom; specifically, the lower side of the gas-liquid flow guide device 10 is the liquid phase zone 100a, the region where the gas-liquid flow guide device 10 is located is the variable speed zone 100b, the turbulent zone 100c is between the demister 20 and the gas-liquid flow guide device 10, and the upper part of the demister 20 is the mist separation zone 100d.

[0030] Specifically, the gas-liquid flow guide device 10 includes an upper and lower opening variable diameter cylinder body 11, after the gas passes through the variable diameter cylinder body 11, the flow rate is changed from high to low, and then more smoothly enters the turbulent flow area 100c and the mist separation area 100d, the spraying device 30 is used to spray mineral oil towards the area where the demister 20 is located, more fine powder and liquid droplets can be intercepted by spraying mineral oil through the demister 20 and the spraying device 30, and a better gas-liquid separation effect can be achieved. At the same time, the gas phase fluid carrying mineral oil into the compressor can also lubricate the compressor. The gas-liquid-solid separation device is used to remove liquid and solid phases in front of the reciprocating compressor, the flow rate change of the gas phase fluid strengthens the coalescence and sedimentation of liquid droplets and fine powder, and is guided into the liquid phase space through the gas-liquid flow guide device 10, the liquid droplet removal effect is improved, and the operation stability of the reciprocating compressor is improved, which is beneficial to long-term operation of the device.

[0031] Specifically, in an optional embodiment, the variable speed area 100b occupies half of the volume of the tank body 100, the variable diameter cylinder body 11 of the gas-liquid flow guide device 10 is configured as a cylinder structure that expands from bottom to top, the lower end of the variable diameter cylinder body 11 forms a gas-liquid inlet, the upper end of the variable diameter cylinder body 11 is fixedly connected with the tank body 100 through a horizontally extending annular plate 12, and a plurality of jet holes 121 are arranged on the annular plate 12. The gas-liquid flow guide device 10 divides the gas-liquid phase fluid in the tank body 100 into two parts, the internal fluid flow rate changes from high to low through the variable diameter cylinder body 11 and then enters the turbulent flow area 100c, and the external fluid changes from low to high and enters the turbulent flow area 100c through the jet holes 121, the high-speed and low-speed fluids further mix in the turbulent flow area 100c and then enter the mist separation area 100d, which can make the liquid and fine powder in the gas-liquid phase fluid gather into larger liquid droplets, and better separation of the gas-liquid phase can be achieved. The jet holes 121 can optimize the distribution of the gas phase in the annular area and the cylindrical area by increasing the pressure drop of the annular area, can effectively improve the problem of uneven distribution of the gas phase, increase the degree of turbulent flow of the gas phase, and thus improve the mass transfer and separation efficiency. It is found through experiments that the jet holes can increase the fluid pressure drop in the annular area by about 1 kpa.

[0032] Specifically, a plurality of rows of jet holes 121 are arranged on the annular plate 12 in the radial direction and uniformly arranged in the circumferential direction, a flow guide plate 13 is arranged on the upper surface of the annular plate 12 at the hole wall area of the jet holes 121, the flow guide plate 13 extends obliquely towards the center line direction of the tank body 100, so that the fluid flowing upwards through the jet holes 121 flows towards the center line direction of the tank body 100, rapidly mixes with the fluid in the inside of the variable diameter cylinder body 11, and optimizes the mixing efficiency of the turbulent flow area 100c. More specifically, the angle between the extension direction of the flow guide plate 13 and the vertical direction is between 15°-30°, which can make the fluid velocity decrease at a smaller amplitude, and ensure the mixing efficiency of the turbulent flow area 100c.

[0033] Specifically, in an optional embodiment, the jet flow hole 121 extends obliquely towards the center line direction of the tank body 100, the angle between the extension direction of the jet flow hole 121 and the vertical direction is 10°-20°, and the area of all the jet flow holes 121 on the annular plate 12 accounts for 25%-40% of the area of the annular plate 12, which can make the flow rate of the gas phase fluid through the jet flow hole reach 40-50 m / s, and is beneficial to the gas mixing in the turbulent zone 100c.

[0034] Specifically, in an optional embodiment, the side wall of the tank body 100 is provided with a feed inlet 101, which is at the same horizontal plane as the gas-liquid inlet of the gas-liquid flow guide device 10. After the gas-liquid phase fluid enters the tank body 100, it is directly divided into two flow channels under the action of the gas-liquid flow guide device 10, thereby improving the gas-liquid separation efficiency of the fluid. More specifically, the tank body 100 is circumferentially arranged with a plurality of uniformly distributed feed inlets 101, so that the gas phase fluid can be uniformly distributed in the outer flow channel, which is beneficial to the full use of the space of the outer flow channel.

[0035] Specifically, in an optional embodiment, the variable-diameter cylinder body 11 of the gas-liquid flow guide device 10 includes a cylindrical cylinder body 111 located on the lower side and a circular truncated cone cylinder body 112 located on the upper side of the cylindrical cylinder body 111. The inner diameter of the cylindrical cylinder body 111 accounts for 45%-55% of the inner diameter of the tank body 100, and the maximum inner diameter of the circular truncated cone cylinder body 112 accounts for 75%-85% of the inner diameter of the tank body 100. The height ratio of the cylindrical cylinder body 111 to the circular truncated cone cylinder body 112 is 1:3-1:2. By adopting the variable-diameter cylinder body 11 with the above size range, the flow rate of the fluid inside the variable-diameter cylinder body 11 can be reduced by about 50% from the gas-liquid inlet to the gas-liquid outlet, and the flow rate of the fluid outside the variable-diameter cylinder body 11 can be increased by 1-2 times from the lower side to the position of the annular plate 12, which is further beneficial to the rapid mixing of the gas-liquid phase fluid in the turbulent zone 100c.

[0036] Specifically, in an optional embodiment, the lower side of the cylindrical cylinder body 111 has a flow guide wall 113 that is inclined inward and arc-shapedly transitions. The angle between the extension direction of the flow guide wall 113 and the generatrix of the cylindrical cylinder body 111 is 10°-20°. By arranging the flow guide wall 113 at the gas-liquid inlet section, liquid droplets on the inner wall of the variable-diameter cylinder body 11 can be gathered, and the gathered liquid droplets can flow downward in bundles.

[0037] Specifically, in an optional embodiment, the mist separation zone 100d accounts for 15%-20% of the height of the tank body 100, and the demister 20 accounts for about 8%-12% of the height of the tank body 100. The demister 20 adopts a wire mesh regular packing, and the wire mesh type can be selected according to different polymer product types.

[0038] The spraying device 30 comprises a spraying body 31 and fan blades 32 rotatably connected to the spraying body 31, the fan blades 32 can periodically rotate around the spraying body 31 under the action of a driving device, the spray head of the spraying body 31 can spray mineral oil to improve the mass transfer separation effect, and the fan blades 32 can increase the flow rate of the mineral oil in the demister 20 to avoid the deposition of the mineral oil on the wire mesh of the demister 20.

[0039] The spray head of the spraying body 31 sprays mineral oil to the entire demister 20 in a fan shape, and the purpose of removing liquid droplets and fine powder in the gas phase is achieved through the contact and mass transfer exchange between the mineral oil and the fluid, and the increased fan blades 32 can change the residence time of the mineral oil in the wire mesh packing by adjusting the different rotating speeds, thereby improving the gas-liquid contact efficiency, and the gas-liquid contact is achieved by using the mineral oil, and when the size of the liquid droplets is 3-5 microns, the liquid content of the outlet gas phase can be reduced to 100 ppm.

[0040] The tank body 100 is provided with an exhaust port 102 at the top, the exhaust port 102 is connected with a compressor inlet pipeline A, the compressor inlet pipeline A is provided with a detection device B for detecting the powder content in the gas, and a control device C controls the spraying device 30 to spray mineral oil at a set period according to the signal of the detection device B, so that the spraying device 30 can periodically spray mineral oil under the condition of high powder content, and the periodic backwashing can reduce the powder content in the gas for lubricating the compressor cylinder.

[0041] Obviously, the above embodiments are only examples for clearly illustrating, but not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A gas-liquid-solid separation device, characterized in that, include: The tank body, and from bottom to top, the gas-liquid diversion device, the demister, and the spraying device are installed inside the tank body; The gas-liquid guiding device includes a variable-diameter cylinder with openings at the top and bottom to achieve reduced flow of gas-liquid phase fluids. The lower surface of the demister is spaced apart from the upper surface of the gas-liquid guiding device, forming a turbulent zone between them; The spraying device is used to spray mineral oil toward the area where the demister is located; The variable diameter cylinder of the gas-liquid guiding device is a cylinder structure that expands from bottom to top. The lower end of the variable diameter cylinder forms a gas-liquid inlet, and the upper end of the variable diameter cylinder is fixedly connected to the tank through a horizontally extending annular plate. Several jet holes are provided on the annular plate. The annular plate is provided with several rows of jet holes arranged evenly in the circumferential direction along the radial direction. A guide plate is provided on the upper surface of the annular plate in the hole wall area of ​​the jet holes. The guide plate extends obliquely toward the center line of the tank.

2. The gas-liquid-solid separation device according to claim 1, characterized in that, The jet orifice extends obliquely toward the centerline of the tank, and the angle between the extension direction of the jet orifice and the vertical direction is 10°-20°. The area of ​​all the jet orifices on the annular plate accounts for 25%-40% of the area of ​​the annular plate.

3. The gas-liquid-solid separation device according to claim 1, characterized in that, The tank body has a feed inlet on its side wall, and the feed inlet is on the same horizontal plane as the gas-liquid inlet of the gas-liquid guiding device.

4. The gas-liquid-solid separation device according to claim 1, characterized in that, The variable-diameter cylinder of the gas-liquid guiding device includes a cylindrical cylinder located on the lower side and a frustum-shaped cylinder located on the upper side of the cylindrical cylinder.

5. A gas-liquid-solid separation device according to claim 4, characterized in that, The lower side of the cylindrical body has an inwardly inclined and arc-shaped guide wall, and the angle between the extension direction of the guide wall and the generatrix of the cylindrical body is 10°-20°.

6. A gas-liquid-solid separation device according to claim 5, characterized in that, The inner diameter of the cylindrical body accounts for 45%-55% of the inner diameter of the tank, and the maximum inner diameter of the frustum-shaped body accounts for 75%-85% of the inner diameter of the tank.

7. A gas-liquid-solid separation device according to claim 1, characterized in that, The spraying device includes a spraying body and fan blades rotatably connected to the spraying body. The fan blades rotate around the spraying body under the action of a drive device.

8. A gas-liquid-solid separation device according to claim 7, characterized in that, The top of the tank is provided with an exhaust port, which is connected to the compressor intake pipe. The compressor intake pipe is provided with a detection device for detecting the powder content in the gas. The control device controls the spraying device to spray mineral oil according to the signal from the detection device at a set cycle.

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