Enhanced separation equipment and method for Fischer-Tropsch product

Abstract

The invention discloses a Fischer-Tropsch product enhanced separation device and method, the Fischer-Tropsch product enhanced separation device comprises: a separator shell, the separator shell comprises at least one feed inlet, and a gas phase outlet, an oil phase outlet and a water phase outlet which are sequentially arranged from top to bottom; the flow dividing external member is arranged in the separator shell and is arranged between the oil phase outlet and the water phase outlet; the buffering flow channel is communicated with the feeding opening and is used for providing feeding for the flow dividing suite; the at least one layer of water blocking structure is arranged in the separator shell and is arranged between the flow dividing external member and the oil phase outlet; and the split-phase auxiliary part is arranged between the separation assembly and the water blocking structure. The invention discloses a Fischer-Tropsch product enhanced separation device and method, and aims to solve the problem that the existing Fischer-Tropsch product enhanced separation effect is not ideal.

Description

Technical Field

[0001] The present application relates to the technical field of Fischer-Tropsch synthesis, and more specifically, to an enhanced separation device and method for Fischer-Tropsch products. Background Art

[0002] The Fischer-Tropsch reaction product flows out of the reactor and is initially separated into a water phase and an oil phase, and carries a certain amount of gas. The water phase is water and a small amount of oxygen-containing compounds and other organic matter, and the oil phase is organic matter containing alkanes, olefins and higher carbon number oxygen-containing compounds; the gas is a small amount of permanent gas such as H2, CO, CO2, CH4, etc. It is easy to entrain small droplets of oil and water phases in the gas phase, and due to the changes in temperature and pressure in the process flow, phase changes such as flash evaporation are prone to occur, which will further aggravate the entrainment of mist and foam. The oil phase and the water phase are prone to emulsification and entrainment, and small droplets of water-in-oil and oil-in-water are distributed in the two phases. Incomplete separation will have a greater adverse effect on subsequent processes.

[0003] Therefore, a Fischer-Tropsch product enhanced separation device and method are needed to solve the above problems. Summary of the invention

[0004] In view of this, the purpose of the present application is to propose a Fischer-Tropsch product enhanced separation device and method to solve the problem of unsatisfactory enhanced separation effect of existing Fischer-Tropsch products.

[0005] Based on the above purpose, the present application provides a Fischer-Tropsch product enhanced separation device, comprising:

[0006] A separator shell, the separator shell comprising at least one feed inlet and a gas phase outlet, an oil phase outlet and a water phase outlet arranged in sequence from top to bottom;

[0007] A flow splitter kit, the flow splitter kit is arranged in the separator housing and between the oil phase outlet and the water phase outlet;

[0008] A buffer flow channel, the buffer flow channel is communicated with the feed port and is used to provide feed to the flow splitting kit;

[0009] At least one water-blocking structure, the water-blocking structure is disposed in the separator housing and between the flow splitting kit and the oil phase outlet;

[0010] A phase separation auxiliary component is arranged between the separation component and the water blocking structure.

[0011] Optionally, a water absorption structure is provided on the outer wall of the buffer flow channel, and the water absorption structure is in contact with the water blocking structure.

[0012] Optionally, a flow guide is provided at the edge of the water blocking structure, and the flow guide is in contact with the water absorbing structure.

[0013] Optionally, an oil suction structure is at least partially provided between the buffer flow channel and the inner wall of the separator housing.

[0014] Optionally, an oil-blocking structure is provided on the water phase outlet cover.

[0015] Optionally, the diversion kit includes at least one connecting flow channel and at least one diversion structure, the connecting flow channel is used to connect the buffer flow channel and the diversion structure, when there are multiple diversion structures, the multiple diversion structures are nested and connected in sequence from the inside to the outside, and at least one water phase port and at least one oil phase port are respectively provided on two opposite sides of the diversion structure.

[0016] Optionally, the phase separation auxiliary component is a plurality of phase separation auxiliary balls, and the phase separation auxiliary balls include a water-blocking ball and a plurality of water-absorbing protrusions uniformly distributed outside the water-blocking layer.

[0017] Optionally, a containing cavity is provided in the water-blocking ball, and the containing cavity is used to be filled with a buoyancy regulating medium.

[0018] The present application also provides a method for enhanced separation of Fischer-Tropsch products, comprising:

[0019] (1) providing a mixed phase Fischer-Tropsch reaction product to a Fischer-Tropsch product enhanced separation device as described above;

[0020] (2) The mixed phase Fischer-Tropsch reaction product enters the diversion kit from the feed inlet of the Fischer-Tropsch product enhanced separation device through the buffer flow channel, is separated into water phase product, oil phase product and gas phase product under the action of the separation auxiliary component, and is discharged from the separator shell through the water phase outlet, oil phase outlet and gas phase outlet respectively.

[0021] In addition, optionally, step (2) also includes: the water phase product is discharged from the separator shell from the water phase outlet through the oil blocking structure; and / or the oil phase product is discharged from the separator shell from the oil phase outlet through the water blocking structure, and the water phase product is intercepted by the water blocking structure and converges to the water absorption structure side.

[0022] From the above, it can be seen that the Fischer-Tropsch product enhanced separation equipment and method provided by the present application have the following advantages compared with the prior art: by using the above-mentioned Fischer-Tropsch product enhanced separation equipment, the Fischer-Tropsch reaction product is separated into water phase product and oil phase product under the diversion action of the diversion kit, and the gas phase product entrained in the two phases is separated out, and the separation time of the partially emulsified oil phase and water phase is shortened and the purity is improved; the separation auxiliary parts effectively reduce the turbulence of the oil phase and the water phase, promote gas-liquid separation, reduce mist entrainment, effectively improve the purity of the three phases, improve the purity of the subsequent process products, and improve the separation efficiency of each phase. Due to the improved separation effect, the temperature of the separation system can be reduced and energy consumption can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above-mentioned features and technical advantages of the present application will become clearer and easier to understand through the following description of its embodiments in conjunction with the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the Fischer-Tropsch product enhanced separation equipment used in the specific embodiments of the present application.

[0025] Figure 2 for Figure 1 A schematic diagram of a flow splitting kit of a Fischer-Tropsch product enhanced separation device is shown.

[0026] Figure 3 for Figure 1 Schematic diagram of the water blocking structure of the Fischer-Tropsch product enhanced separation device is shown.

[0027] Figure 4 for Figure 1 Schematic diagram of the phase separation auxiliary balls of the Fischer-Tropsch product enhanced separation device shown.

[0028] Figure 5 for Figure 1 Schematic diagram of the oil barrier structure of the Fischer-Tropsch product enhanced separation device shown.

[0029] The reference numerals are:

[0030] 1. Separator shell; 11. Feed inlet; 12. Gas phase outlet; 13. Oil phase outlet; 14. Water phase outlet; 2. Diversion kit; 3. Buffer flow channel; 4. Water blocking structure; 41. Water blocking film; 42. Chamfered edge; 5. Phase separation auxiliary ball; 6. Water absorbent cotton; 7. Oil absorbent cotton; 8. Oil blocking film. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. The same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings. The words "inside" and "outside" used refer to the direction toward or away from the geometric center of a specific component, respectively.

[0032] Figure 1 This is a schematic diagram of the Fischer-Tropsch product enhanced separation equipment used in the specific embodiments of the present application. Figure 2 for Figure 1 A schematic diagram of a flow splitting kit of a Fischer-Tropsch product enhanced separation device is shown. Figure 3 for Figure 1 Schematic diagram of the water blocking structure of the Fischer-Tropsch product enhanced separation device is shown. Figure 4 for Figure 1 Schematic diagram of the phase separation auxiliary ball of the Fischer-Tropsch product enhanced separation device shown in FIG. Figures 1 to 4 As shown, the Fischer-Tropsch product enhanced separation device includes a separator shell 1, a flow diversion kit 2, a buffer flow channel 3, at least one layer of water-blocking structure 4 and a phase separation auxiliary component.

[0033] The separator housing 1 includes at least one feed port 11 and a gas phase outlet 12, an oil phase outlet 13 and a water phase outlet 14 arranged in sequence from top to bottom. The main body of the separator housing 1 is cylindrical, with an arc-shaped seal on the top and a conical seal on the bottom. The feed port 11 is usually arranged in multiple, such as 2-4 feed ports 11 uniformly distributed along the circumferential direction on the main body of the separator housing 1. A gas phase outlet 12, an oil phase outlet 13 and a water phase outlet 14 are usually provided respectively, and the gas phase product is a small amount of permanent gas such as H2, CO, CO2, CH4, etc.; the gas phase outlet 12 is provided at the top of the separator shell 1, such as the highest point of the arc-shaped seal, and the gas phase outlet 12 can be connected to the fan for extracting the gas phase product; the water phase outlet 14 is provided at the bottom of the separator shell 1, such as the lowest point of the conical seal, and the water phase product is water and organic substances such as oxygen-containing compounds; the water phase outlet 14 can be connected to a water pump for extracting the water phase product; the oil phase product is organic substances such as alkanes, olefins and oxygen-containing compounds with higher carbon numbers; the oil phase outlet 13 is provided in the middle and upper part of the main body of the separator shell 1, such as being located relatively above the feed port 11, and the oil phase outlet 13 can be connected to an oil pump for extracting the oil phase product.

[0034] The flow splitter kit 2 is arranged in the separator housing 1 and between the oil phase outlet 13 and the water phase outlet 14; the flow splitter kit 2 is located in the separator housing 1 and is relatively located below, close to the conical seal. The flow splitter kit 2 is used to separate the gas phase product, the water phase product and the oil phase product, especially to separate the water phase product and the oil phase product entrained by the gas phase product. The water phase product is heavier than the oil phase product, and the gas phase product is the lightest, that is, the water phase product sinks, the oil phase product floats, floats on the water phase product, and the gas phase product moves up. The flow splitter kit 2 is arranged between the oil phase outlet 13 and the water phase outlet 14, the oil phase product floats and is discharged through the oil phase outlet 13, the water phase product sinks and is discharged through the water phase outlet 14, and the gas phase product is discharged through the gas phase outlet 12. The flow splitter kit 2 is usually detachably connected to the separator housing 1, and the flow splitter kit 2 includes a plurality of flow splitter structures, and the number of the flow splitter structures is increased or decreased according to the processing volume to adjust the flexibility of the flow splitter kit 2. Multiple diversion structures can be set with different screening effects to adjust the accuracy of the diversion kit 2.

[0035] The buffer channel 3 is connected to the feed port 11 and is used to provide feed to the diversion kit 2; the feed port 11 is connected to the buffer channel 3, and the buffer channel 3 is usually tilted inward to play a buffering and stabilizing flow role. The total volume of the buffer channel 3 is adjusted according to the processing volume. Usually, each feed port 11 is equipped with at least one buffer channel 3, and each buffer channel 3 is an independent structure. The buffer channel 3 can also be set as a funnel-shaped structure, the feed port 11 is connected to the top of the funnel-shaped structure, and the diversion kit 2 is set at the bottom of the funnel-shaped structure. The annular gap of the funnel-shaped structure is filled with Fischer-Tropsch reaction products, which are stably transported to the diversion sleeve assembly by plug flow.

[0036] The water-blocking structure 4 is arranged in the separator shell 1 and between the diversion kit 2 and the oil phase outlet 13; the water-blocking structure 4 does not affect the passage of the gas phase product and the oil phase product, and at the same time prevents the passage of the water phase product, so that the gas phase product and the oil phase product move upward and can be discharged from the gas phase outlet 12 and the oil phase outlet 13 respectively, while the water phase product moves downward and can be discharged from the water phase outlet 14.

[0037] The phase separation auxiliary component is arranged between the separation component and the water blocking structure 4. The phase separation auxiliary component has the characteristic of repelling water, further improving the separation effect of the water phase and the oil phase, and reducing the burden of subsequent links.

[0038] The Fischer-Tropsch reaction product flows out of the reactor in a mixed direction, and is initially separated into a gas phase and a wax phase before flowing into the Fischer-Tropsch product enhanced separation device, where water phase, oil phase and gas phase separation are carried out in the separator shell 1; specifically, the Fischer-Tropsch reaction product enters the diversion kit 2 from the feed port 11 through the buffer flow channel 3, and is separated into water phase products, oil phase products and gas phase products under the diversion action of the diversion kit 2. Under the action of the separation auxiliary component, the entrainment of water phase products by the gas phase products is reduced, and the water blocking structure 4 does not affect the passage of the gas phase products and the oil phase products, but blocks the passage of the water phase products. Under the action of gravity, the water phase products move downward and are discharged from the separator shell 1 through the water phase outlet 14; the oil phase products float up, pass through the separation auxiliary component and the water blocking structure 4 in turn, and are discharged from the separator shell 1 through the oil phase outlet 13; the gas phase products move upward, pass through the separation auxiliary component and the water blocking structure 4 in turn, continue to move to the top, and are discharged from the separator shell 1 through the gas phase outlet 12.

[0039] By using the above-mentioned Fischer-Tropsch product enhanced separation equipment, the Fischer-Tropsch reaction product is separated into water phase product and oil phase product under the diversion effect of the diversion kit 2, and the gas phase product entrained in the two phases is separated out, and the separation time of the partially emulsified oil phase and water phase is shortened and the purity is improved; the separation auxiliary component effectively reduces the turbulence of the gas phase, oil phase and water phase, promotes gas-liquid separation, reduces mist entrainment, effectively improves the purity of the three phases, improves the purity of the subsequent process products, and improves the separation efficiency of each phase. Due to the improved separation effect, the temperature of the separation system can be reduced and energy consumption can be reduced.

[0040] In one embodiment of the present application, the water-blocking structure 4 includes but is not limited to a water-blocking film 41, which is made of a super-hydrophobic material or a filterable porous super-hydrophobic material. For example, the water-blocking structure 4 is covered with a polydopamine coating.

[0041] In one embodiment of the present application, the water-blocking structure 4 is usually arranged in multiple layers, and the multiple layers of water-blocking structures 4 are stacked in sequence, and there is a certain gap between adjacent water-blocking structures 4. The shape of each layer of water-blocking structure 4 is substantially the same, but due to different setting positions or different coverage areas, there are differences in size. For example, the water-blocking structure 4 is arranged between relative buffer channels 3, and the buffer channels 3 are arranged obliquely, that is, the distance between the two buffer channels 3 gradually decreases from top to bottom, and multiple water-blocking structures 4 are arranged in sequence along the buffer channels 3, and the closer the water-blocking structure 4 is to the top of the buffer channel 3, the larger the size, and the closer the water-blocking structure 4 is to the bottom of the buffer channel 3, the smaller the size. With the above-mentioned water-blocking structure 4, the number of layers and positions can be flexibly adjusted, and installation and disassembly are convenient, and can be flexibly configured and adjusted according to the separation difficulty and processing volume of the Fischer-Tropsch reaction products.

[0042] Optionally, a water absorption structure is provided on the outer wall of the buffer flow channel 3, and the water absorption structure is in contact with the water blocking structure 4. The water blocking structure 4 is connected to the buffer flow channel 3, and the water phase intercepted by the water blocking structure 4 gradually converges to the water absorption structure, and is absorbed and guided back to the diversion kit 2 by the water absorption structure. By providing the above-mentioned water absorption structure, the water phase intercepted by the water blocking structure 4 can be recovered, so that the oil phase and the water phase are completely separated, the separation effect is improved, and adverse effects on subsequent processes are avoided.

[0043] In one embodiment of the present application, the water absorbing structure includes but is not limited to water absorbing cotton 6, which is wrapped outside the buffer flow channel 3 or arranged on the side of the buffer flow channel 3 facing the water blocking structure 4. Since the buffer flow channel 3 is inclined, the water absorbing cotton 6 is also inclined, and the water phase absorbed by the upper water absorbing cotton 6 moves toward the bottom of the water absorbing cotton 6 under the action of gravity.

[0044] Optionally, a flow guide is provided at the edge of the water blocking structure 4, and the flow guide is in contact with the water absorbing structure. The water phase trapped on the water blocking structure 4 converges to one side at the chamfer of the edge of the water blocking film 41, such as converging the water phase trapped in the middle of the water blocking structure 4 to one side of the edge. At the same time, the flow guide guides the water phase to move toward the water absorbing structure, and can timely guide the water phase backflow while ensuring that the water blocking effect of the water blocking structure 4 is not affected.

[0045] In one embodiment of the present application, the water-blocking film 41 of the water-blocking structure 4 is high in the middle and low at the edge, and a chamfered edge 42 is formed at the edge to collect the water phase intercepted by the water-blocking film 41 and guide it to the water-absorbing structure. The chamfering depth and width of the chamfered edge 42 are the same, such as 2 cm.

[0046] Optionally, an oil absorption structure is at least partially provided between the buffer flow channel 3 and the inner wall of the separator housing 1. The oil absorption structure can absorb the oil phase product to prevent the oil phase product from remaining on the separator housing 1 and causing a dead angle. By providing the oil absorption structure, the residual oil on the inner wall of the separator housing 1 is absorbed and discharged regularly.

[0047] In one embodiment of the present application, the oil absorption structure includes but is not limited to oil absorption cotton 7, the buffer flow channel 3 is inclined, the gap between the buffer flow channel 3 and the separator shell 1 gradually increases from top to bottom, and the oil absorption cotton 7 is filled in the smallest gap between the buffer flow channel 3 and the separator shell 1.

[0048] Figure 5 for Figure 1 Schematic diagram of the oil barrier structure of the Fischer-Tropsch product enhanced separation device shown in FIG. Figure 5 As shown, the Fischer-Tropsch product enhanced separation device includes an oil-blocking structure.

[0049] Optionally, an oil-blocking structure is provided on the water phase outlet 14. The water phase product can pass through the oil-blocking structure, while the oil phase product cannot pass through the oil-blocking structure. By setting the oil-blocking structure, once the water phase product carries the oil phase product out of the diversion kit 2, the water phase product passes through the oil-blocking structure, while the oil phase product cannot pass through the oil-blocking structure. This ensures that only the water phase product passes through the water phase outlet 14, which helps to achieve efficient separation of water and oil.

[0050] In one embodiment of the present application, the oil-blocking structure includes but is not limited to an oil-blocking membrane 8, and the oil-blocking membrane 8 is made of ultrafiltration / nanofiltration membrane material.

[0051] In one embodiment of the present application, the oil-blocking membrane 8 is covered relatively above the water phase outlet 14, such as the oil-blocking membrane 8 is connected to the relatively below the diversion kit 2, or the oil-blocking membrane 8 is connected to the inner wall of the separator shell 1, and the cover is arranged around the water phase outlet 14 to collect the oil phase product and discharge it regularly.

[0052] Optionally, the diversion kit 2 includes at least one connecting flow channel and at least one diversion structure, the connecting flow channel is used to connect the buffer flow channel 3 and the diversion structure, when there are multiple diversion structures, the multiple diversion structures are nested and connected from the inside to the outside, and the diversion structures are respectively provided with at least one water phase port and at least one oil phase port on opposite sides. The top of the diversion structure is provided with multiple oil phase ports arranged in sequence along the axial direction, and the oil phase port is used to output oil phase products and gas phase products; the bottom of the diversion structure is provided with multiple water phase ports arranged in sequence along the axial direction, and the water phase port is used to output water phase products. There are one or more connecting flow channels, when there are multiple connecting flow channels, the multiple connecting flow channels are evenly distributed along the circumferential direction of the innermost diversion structure, one end of each connecting flow channel is connected to the buffer flow channel 3, and the other end is connected to the innermost diversion structure. The diversion kit 2 can be a nested arrangement of 1-5 layers of diversion structures, and the screening objects on each diversion structure are not exactly the same. Generally, the water phase port and the oil phase port of the diversion kit 2 closer to the inside have larger apertures, and the water phase port and the oil phase port of the diversion kit 2 closer to the outside have smaller apertures. The Fischer-Tropsch reaction product flows into the diversion kit 2 from the feed port 11 through the buffer channel, and gradually diffuses outward from the innermost diversion structure. During the flow, the water phase sinks, the gas phase and the oil phase float, the water phase flows out from the water phase port, and the gas phase and the oil phase flow out from the oil phase port. With the above-mentioned diversion kit 2, the number of layers and the opening rate of the diversion structure can be flexibly adjusted, and it is easy to install and disassemble. It can be flexibly configured and adjusted according to the separation difficulty and processing volume of the Fischer-Tropsch reaction products.

[0053] The diversion kit 2 can be a nested arrangement of 1-5 layers of diversion structures. The diversion kit 2 is provided with a sieve plate / net according to the processing capacity of the separation equipment. The opening rate and aperture of each layer can be changed step by step, for example, it can be gradually reduced from the inside to the outside, such as the opening rate gradually decreases from 80% to 20%. In one embodiment of the present application, the diversion kit 2 is a nested arrangement of 3 layers of diversion structures, wherein the innermost layer is the first layer, and the diversion structure is a sieve plate structure with an opening rate of 80% and an aperture of 2mm. The second layer is 2cm apart from the outside of the first layer, and the diversion structure is also a sieve plate structure with an opening rate of 50% and an aperture of 1mm. The third layer is 3cm apart from the outside of the second layer, and the diversion structure is a sieve mesh structure with 200 mesh. After the Fischer-Tropsch reaction product enters the diversion kit 2, the gas phase and most of the oil phase flow out from the oil phase port provided at the top of each diversion structure, and the water phase flows out from the water phase port provided at the bottom of each diversion structure.

[0054] Optionally, the phase separation auxiliary component is a plurality of phase separation auxiliary balls 5, and the phase separation auxiliary balls 5 include a water-blocking ball and a plurality of water-absorbing protrusions evenly distributed outside the water-blocking layer. The density of the phase separation auxiliary ball 5 is 0.75-1.0, and it has the characteristic of repelling water. The water-absorbing protrusions are conducive to collecting and converging tiny water droplets. When the small water droplets converge into large droplets, the water-blocking balls repel water and fall due to gravity, thereby diverting the residual water phase. The use of the above-mentioned phase separation auxiliary balls 5 helps to separate the mixed phase into water phase, oil phase and gas phase, further improves the separation effect of water phase and oil phase, and reduces the burden on subsequent links. The number and position of the phase separation auxiliary balls 5 can be flexibly adjusted, and they are easy to install and disassemble. They can be flexibly configured and adjusted according to the separation difficulty and processing volume of the Fischer-Tropsch reaction products.

[0055] In one embodiment of the present application, the water-blocking ball is made of a water-blocking material, and water-absorbing protrusions are evenly distributed on the surface of the water-blocking ball. The water-absorbing protrusions are similar to fiber filaments that diverge in the shape of tentacles and are made of water-absorbing material. The fiber filaments are about 2 cm long and have a gradually changing width. They are slightly thicker near the root of the water-blocking ball, have a diameter of about 1 mm, and gradually become thinner outward.

[0056] Optionally, a receiving chamber is provided in the water blocking ball, and the receiving chamber is used to fill a buoyancy regulating medium. By filling different buoyancy regulating mediums in the receiving chamber, the water blocking ball has different buoyancy to adjust the position of the phase separation auxiliary ball 5 above the flow diversion kit 2.

[0057] In one embodiment of the present application, the phase-separation auxiliary ball 5 can be connected together by snapping two hemispherical structures, and the internal cavities of the two hemispherical structures form a accommodating cavity. The interior of the accommodating cavity can be filled with at least one of gas / liquid / solid phase media, so that the phase-separation auxiliary balls 5 with different gravities are arranged at different positions between the diversion kit 2 and the bottommost water-blocking structure 4.

[0058] The following further introduces the use process of the Fischer-Tropsch product enhanced separation equipment.

[0059] The Fischer-Tropsch reaction product enters the diversion kit 2 from the feed port 11 through the buffer flow channel 3. The Fischer-Tropsch reaction product feed can be pressurized by a pump to increase the driving force for the separation of the oil-water two-phase, thereby increasing the permeation flux and the separation efficiency. Under the diversion effect of the diversion kit 2, the product is separated into water phase products, oil phase products and gas phase products. Under the action of the separation auxiliary component, the entrainment of water and oil phase products in the gas phase product is reduced. The water blocking structure 4 does not affect the passage of the gas phase product and the oil phase product, but blocks the passage of the water phase product. Under the action of gravity, the water phase product The product moves downward, passes through the oil blocking structure, and is discharged from the separator shell 1 through the water phase outlet 14; the oil phase product floats up, passes through the separation auxiliary component and the water blocking structure 4 in turn, and is discharged from the separator shell 1 through the oil phase outlet 13; the water phase intercepted by the water blocking structure 4 gathers toward the chamfered edge 42, is adsorbed by the water absorption structure, moves downward along the water absorption structure and flows back to the diversion kit 2, enters the diversion again and moves downward, passes through the oil blocking structure, and is discharged from the separator shell 1 through the water phase outlet 14; and the oil absorption structure absorbs and discharges the residual oil regularly. The gas phase product moves upward, passes through the separation auxiliary component and the water blocking structure 4 in turn, continues to move toward the top, and is discharged from the separator shell 1 through the gas phase outlet 12.

[0060] The following is a description of the use of the Fischer-Tropsch product enhanced separation device in conjunction with a specific embodiment (see Table 1).

[0061] Table 1 Comparison of product pre-separation system effects

[0062]

[0063]

[0064] In the comparative example, in a separator without a pump, a diversion kit 2, a phase separation auxiliary ball 5 and a water-blocking structure 4, the system temperature is set to 35-50°C and the system pressure is set to 0.1-0.4MPa by heating and pressurizing. The Fischer-Tropsch reaction product enters the reactor, and the separation effect of gas, liquid and oil is the worst. The liquid content of the gas phase is 50-120 mg / L, the oil content of the water phase is 80-100 mg / L, and the water content of the oil phase is 0-50 mg / L.

[0065] In Example 1, a diverter kit 2 and a primary water-blocking structure 4 are additionally provided in a separator shell 1 where a pump and a phase-separation auxiliary ball 5 are not provided. At normal temperature and pressure, the Fischer-Tropsch reaction product enters the reactor, and the gas-liquid-oil three-phase separation effect is relatively improved. The liquid content of the gas phase is 50-80 mg / L, and the upper limit is reduced by 40 mg / L relative to the comparative example. The oil content of the water phase is 20-50 mg / L, and the upper limit is reduced by 50 mg / L relative to the comparative example, and the lower limit is reduced by 60 mg / L. The water content of the oil phase is 0-20 mg / L, and the upper limit is reduced by 30 mg / L relative to the comparative example.

[0066] In Example 2, on the basis of Example 1, phase separation auxiliary balls 5 and an additional water-blocking structure 4 are additionally provided to form a two-stage water-blocking structure 4. At normal temperature and pressure, the Fischer-Tropsch reaction product enters the reactor, and the gas, liquid and oil three-phase separation effect is further improved. The gas phase liquid content is 20-60 mg / L, and relative to the comparative example, the upper limit is reduced by 60 mg / L, and the lower limit is reduced by 30 mg / L; relative to Example 1, the upper limit is reduced by 20 mg / L, and the lower limit is reduced by 30 mg / L; the water phase oil content is 10-30 mg / L, and relative to the comparative example, the upper limit is reduced by 70 mg / L, and the lower limit is reduced by 70 mg / L; relative to Example 1, the upper limit is reduced by 20 mg / L, and the lower limit is reduced by 10 mg / L; the oil content of the oil phase is 0-20 mg / L, and relative to the comparative example, the upper limit is reduced by 30 mg / L; relative to Example 1, there is no obvious change.

[0067] In Example 3, on the basis of Example 2, a pump and an additional water-blocking structure 4 are added to form a three-stage water-blocking structure 4. At normal temperature and pressure, the Fischer-Tropsch reaction product enters the reactor, and the gas, liquid and oil three-phase separation effect is the best. The gas phase liquid content is 10-20 mg / L. Relative to the comparative example, the upper limit is reduced by 90 mg / L and the lower limit is reduced by 40 mg / L; relative to Example 1, the upper limit is reduced by 50 mg / L and the lower limit is reduced by 40 mg / L; relative to Example 2, the upper limit is reduced by 30 mg / L and the lower limit is reduced by 10 mg / L; water The oil content of the phase is 0-20 mg / L, and the upper limit is reduced by 80 mg / L and the lower limit is reduced by 80 mg / L relative to the comparative example; the upper limit is reduced by 30 mg / L and the lower limit is reduced by 20 mg / L relative to Example 1; the upper limit is reduced by 10 mg / L and the lower limit is reduced by 10 mg / L relative to Example 2; the water content of the oil phase is 0-20 mg / L, and the upper limit is reduced by 40 mg / L relative to the comparative example; the upper limit is reduced by 10 mg / L relative to Examples 1 and 2; the separation time can be reduced from at least 50 min in the comparative example to 20 min.

[0068] The present application also provides a method for enhanced separation of Fischer-Tropsch products, comprising:

[0069] (1) Providing a mixed phase of Fischer-Tropsch reaction products to a Fischer-Tropsch product enhanced separation device as described above; the Fischer-Tropsch product enhanced separation method may use any of the Fischer-Tropsch product enhanced separation devices described above.

[0070] (2) The mixed phase Fischer-Tropsch reaction product enters the diversion kit 2 through the buffer flow channel 3 from the feed inlet 11 of the Fischer-Tropsch product enhanced separation device, and is separated into water phase product, oil phase product and gas phase product under the action of the separation auxiliary component, and is discharged from the separator shell 1 through the water phase outlet 14, the oil phase outlet 13 and the gas phase outlet 12 respectively.

[0071] The Fischer-Tropsch reaction product enters the diversion kit 2 from the feed port 11 through the buffer flow channel 3, and is separated into water phase products, oil phase products and gas phase products under the diversion action of the diversion kit 2. The entrainment of water phase products by gas phase products is reduced under the action of the separation auxiliary component. The water blocking structure 4 does not affect the passage of gas phase products and oil phase products, but blocks the passage of water phase products. Under the action of gravity, the water phase product moves downward and is discharged from the separator shell 1 through the water phase outlet 14; the oil phase product floats up, passes through the separation auxiliary component and the water blocking structure 4 in turn, and is discharged from the separator shell 1 through the oil phase outlet 13; the gas phase product moves upward, passes through the separation auxiliary component and the water blocking structure 4 in turn, continues to move to the top, and is discharged from the separator shell 1 through the gas phase outlet 12.

[0072] By adopting the above-mentioned Fischer-Tropsch product enhanced separation method, the Fischer-Tropsch reaction product is separated into water phase product and oil phase product under the diversion effect of the diversion kit 2, and the gas phase product entrained in the two phases is separated out, and the separation time of the partially emulsified oil phase and water phase is shortened and the purity is improved; the separation auxiliary component effectively reduces the turbulence of the oil phase and the water phase, promotes gas-liquid separation, reduces mist entrainment, effectively improves the purity of the three phases, improves the purity of the subsequent process products, and improves the separation efficiency of each phase. Due to the improved separation effect, the temperature of the separation system can be reduced and energy consumption can be reduced.

[0073] In addition, optionally, step (2) further includes: the water phase product is discharged from the separator housing 1 through the water phase outlet 14 via the oil blocking structure; the water phase product moves downward, passes through the oil blocking structure, and is discharged from the separator housing 1 through the water phase outlet 14. The use of the above oil blocking structure can improve the oil-liquid separation efficiency and the purity of the three phases.

[0074] And / or step (2) further includes: the oil phase product is discharged from the separator housing 1 from the oil phase outlet 13 through the water blocking structure 4, and the water phase product is intercepted by the water blocking structure 4 and converges to the water absorption structure side. The water phase intercepted by the water blocking structure 4 gathers toward the chamfered edge 42, is adsorbed by the water absorption structure, moves down along the water absorption structure and flows back to the diversion kit 2, enters the diversion again and moves down, passes through the oil blocking structure, and is discharged from the separator housing 1 through the water phase outlet 14. The use of the above-mentioned water blocking structure 4 can improve the oil-liquid separation efficiency and improve the purity of the three phases.

[0075] From the above description and practice, it can be known that the Fischer-Tropsch product enhanced separation equipment and method provided by the present application have the following advantages compared with the prior art: by using the above-mentioned Fischer-Tropsch product enhanced separation equipment, the Fischer-Tropsch reaction product is separated into water phase product and oil phase product under the diversion action of the diversion kit, and the gas phase product entrained in the two phases is separated out, and the separation time of the partially emulsified oil phase and water phase is shortened and the purity is improved; the separation auxiliary parts effectively reduce the turbulence of the oil phase and the water phase, promote gas-liquid separation, reduce mist entrainment, effectively improve the purity of the three phases, improve the purity of the subsequent process products, and improve the separation efficiency of each phase. Due to the improved separation effect, the temperature of the separation system can be reduced and energy consumption can be reduced.

[0076] A person skilled in the art should understand that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present application should be included in the protection scope of the present application.

Claims

1. A Fischer-Tropsch product enhanced separation device, characterized in that: include: A separator shell, the separator shell comprising at least one feed inlet and a gas phase outlet, an oil phase outlet and a water phase outlet arranged in sequence from top to bottom; A flow splitter kit, the flow splitter kit is arranged in the separator housing and between the oil phase outlet and the water phase outlet; A buffer flow channel, the buffer flow channel is communicated with the feed port and is used to provide feed to the flow splitting kit; At least one water-blocking structure, the water-blocking structure is disposed in the separator housing and between the flow splitting kit and the oil phase outlet; A phase separation auxiliary component is provided between the separation component and the water blocking structure.

2. The Fischer-Tropsch product enhanced separation device according to claim 1, characterized in that: A water absorption structure is arranged on the outer wall of the buffer flow channel, and the water absorption structure is in contact with the water blocking structure.

3. The Fischer-Tropsch product enhanced separation device according to claim 2, characterized in that: A flow guide is provided at the edge of the water blocking structure, and the flow guide is in contact with the water absorbing structure.

4. The Fischer-Tropsch product enhanced separation device according to any one of claims 1 to 3, characterized in that: An oil suction structure is at least partially disposed between the buffer flow channel and the inner wall of the separator housing.

5. The Fischer-Tropsch product enhanced separation device according to any one of claims 1 to 3, characterized in that: An oil-blocking structure is provided on the water phase outlet cover.

6. The Fischer-Tropsch product enhanced separation device according to any one of claims 1 to 3, characterized in that: The diversion kit includes at least one connecting flow channel and at least one diversion structure, wherein the connecting flow channel is used to connect the buffer flow channel and the diversion structure. When there are multiple diversion structures, the multiple diversion structures are nested and connected in sequence from the inside to the outside, and at least one water phase port and at least one oil phase port are respectively arranged on two opposite sides of the diversion structure.

7. The Fischer-Tropsch product enhanced separation device according to any one of claims 1 to 3, characterized in that: The phase separation auxiliary component is a plurality of phase separation auxiliary balls, and the phase separation auxiliary balls include a water blocking ball and a plurality of water absorbing protrusions evenly distributed outside the water blocking layer.

8. The Fischer-Tropsch product enhanced separation device according to claim 7, characterized in that: The water-blocking ball is provided with a containing cavity, and the containing cavity is used to be filled with a buoyancy regulating medium.

9. A method for enhanced separation of Fischer-Tropsch products, characterized in that: include: (1) providing a mixed-phase Fischer-Tropsch reaction product to a Fischer-Tropsch product enhanced separation device as claimed in any one of claims 1 to 8; (2) The mixed phase Fischer-Tropsch reaction product enters the diversion kit from the feed inlet of the Fischer-Tropsch product enhanced separation device through the buffer flow channel, is separated into water phase product, oil phase product and gas phase product under the action of the separation auxiliary component, and is discharged from the separator shell through the water phase outlet, oil phase outlet and gas phase outlet respectively.

10. The method for enhanced separation of Fischer-Tropsch products according to claim 9, characterized in that: Step (2) also includes: the water phase product is discharged from the water phase outlet of the separator shell through the oil blocking structure; and / or the oil phase product is discharged from the oil phase outlet of the separator shell through the water blocking structure, and the water phase product is intercepted by the water blocking structure and converges to the water absorption structure side.

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