Vacuum-pumping unit system for refining Fischer-Tropsch wax

Abstract

The utility model relates to a Fischer-Tropsch wax refining vacuumizing unit system which comprises a Roots vacuum pump set, a liquid ring vacuum pump, a first separation tank and a second separation tank, one end of the first separation tank is communicated with a wax refining device, the other end of the first separation tank is communicated with the Roots vacuum pump set, and the other end of the first separation tank is communicated with the liquid ring vacuum pump set. The other end of the Roots vacuum pump set is communicated with the second separation tank, and the other end of the second separation tank is connected with the liquid ring vacuum pump. According to the Fischer-Tropsch wax refining vacuumizing unit system, the first separation tank and the second separation tank are arranged, the first separation tank is used for preliminarily separating gas and impurities from a wax refining device, and the second separation tank is used for separating solid impurities generated after a pipeline and the device are corroded by acid gas; a large amount of solid impurities are prevented from entering the vacuum unit to cause blockage of pipelines in the vacuum unit and damage to a vacuum pump.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vacuum units, and more precisely, the present disclosure relates to a vacuum pumping unit system for refined Fischer-Tropsch wax. Background Art

[0002] During the process of refining Fischer-Tropsch wax, generally, a vacuum environment is required inside the refining wax device for corresponding chemical reactions. Therefore, a vacuum pumping device needs to be added outside the refining wax device to create a vacuum reaction environment. Since a small amount of organic acid is generated during the reaction process, it will corrode the pipelines and devices. Moreover, during the vacuum pumping process, it is inevitable to suck the high-melting-point liquid wax in the refining wax device into the vacuum unit. The high-melting-point liquid wax will settle on the inner wall of the pipelines and the inner cavity of the vacuum pump in the vacuum unit during the suction process, which will block the internal pipelines of the vacuum unit and cause irreversible damage to the vacuum pump. Summary of the Utility Model

[0003] In view of this, the embodiments of the present disclosure provide a vacuum pumping unit system for refined Fischer-Tropsch wax to solve the technical defects existing in the prior art.

[0004] To achieve the above object, the present disclosure adopts the following technical solutions:

[0005] The present disclosure provides a vacuum pumping unit system for refined Fischer-Tropsch wax, comprising:

[0006] A first separation tank, the first separation tank is provided with a first inlet and a first exhaust port. Among them, the first inlet is configured to communicate with the refining wax device, and the first separation tank is configured to separate the gas and impurities from the refining wax device;

[0007] A Roots vacuum pump set, the Roots vacuum pump set is provided with a first air inlet and an air outlet. Among them, the first air inlet is communicated with the first exhaust port of the first separation tank, and the Roots vacuum pump set is configured to evacuate the refining wax device;

[0008] A second separation tank, the second separation tank is provided with a second inlet and a second exhaust port. Among them, the second inlet is communicated with the air outlet of the Roots vacuum pump set, and the second separation tank is configured to separate the gas and impurities from the Roots vacuum pump set;

[0009] A liquid ring vacuum pump, the liquid ring vacuum pump is provided with a fourth air inlet and a liquid ring vacuum pump outlet. Among them, the fourth air inlet is communicated with the second exhaust port of the second separation tank, and the liquid ring vacuum pump is configured to compress the gas entering the liquid ring vacuum pump and discharge it through the liquid ring vacuum pump outlet.

[0010] In an embodiment of the present disclosure, the Roots vacuum pump group includes a first Roots vacuum pump, which is provided with a first air outlet and the first air inlet. The first air inlet is communicated with the first exhaust port of the first separation tank. The first Roots vacuum pump is configured to evacuate the gas from the refined wax device.

[0011] In an embodiment of the present disclosure, the Roots vacuum pump group includes a second Roots vacuum pump, which is provided with a second air inlet and a second air outlet. The second air inlet is communicated with the first air outlet of the first Roots vacuum pump. The second Roots vacuum pump is configured to perform secondary evacuation on the gas from the first Roots vacuum pump.

[0012] In an embodiment of the present disclosure, the Roots vacuum pump group includes a third Roots vacuum pump, which is provided with a third air inlet and the air outlet. The third air inlet is communicated with the second air outlet of the second Roots vacuum pump. The third Roots vacuum pump is configured to perform tertiary evacuation on the gas from the second Roots vacuum pump.

[0013] In an embodiment of the present disclosure, the refined Fischer-Tropsch wax evacuation unit system further includes:

[0014] A third separation tank, which is provided with a third inlet, a third exhaust port, and a vacuum oil outlet. Among them, the third inlet is communicated with the outlet of the liquid ring vacuum pump. The third separation tank is configured to separate the gas and vacuum oil from the liquid ring vacuum pump.

[0015] A filtering device, which is provided with a filtering inlet and a filtering outlet. The filtering inlet is communicated with the vacuum oil outlet of the third separation tank. The filtering device is configured to filter the impurities in the vacuum oil.

[0016] A cooler, which is provided with a cooler inlet and a cooler outlet. The cooler inlet is communicated with the filtering outlet of the filtering device. The cooler outlet is communicated with the liquid ring vacuum pump. The cooler is configured to cool down the vacuum oil.

[0017] In an embodiment of the present disclosure, the liquid ring vacuum pump is further provided with a pump priming line, where the pump priming line is configured to provide initial vacuum oil for the liquid ring vacuum pump.

[0018] In an embodiment of the present disclosure, the third separation tank is further provided with a pump priming inlet and a pump priming outlet. Among them, the pump priming inlet is arranged at the top of the third separation tank for introducing vacuum oil into the third separation tank and the liquid ring vacuum pump. The pump priming outlet is communicated with the liquid ring vacuum pump through the pump priming line.

[0019] In one embodiment of the present disclosure, the refined Fischer-Tropsch wax vacuum pumping unit system further includes a circulating oil pump, which is configured between the filtering device and the cooler to provide power for passing the vacuum oil from the filtering device into the cooler.

[0020] In one embodiment of the present disclosure, the filtering device is configured to include a first filter and a second filter, and the first filter and the second filter are arranged in parallel.

[0021] In one embodiment of the present disclosure, pressure difference gauges and valves are respectively arranged at both ends of the first filter and the second filter.

[0022] The refined Fischer-Tropsch wax vacuum pumping unit system provided by the present disclosure is provided with a first separation tank and a second separation tank. The first separation tank is used for preliminarily separating the gas and impurities from the refined wax device, and the second separation tank is used for separating the solid impurities generated after the pipeline and the device are corroded by acidic gas, preventing a large amount of solid impurities from entering the vacuum pumping unit and causing blockage of the internal pipeline of the vacuum pumping unit and damage to the vacuum pump.

[0023] Other features and advantages of the present disclosure will become clear through the following detailed description of the exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a refined Fischer-Tropsch wax vacuum pumping unit system provided by an embodiment of the present disclosure.

[0025] 1 - First inlet; 2 - First exhaust port; 3 - First drain port; 4 - First intake port; 5 - First outlet port; 6 - Second intake port; 7 - Second outlet port; 8 - Third intake port; 9 - Outlet port; 10 - Second inlet; 11 - Second exhaust port; 12 - Second drain port; 13 - Fourth intake port; 14 - Liquid ring vacuum pump outlet; 15 - Liquid inlet; 16 - Third inlet; 17 - Pump filling outlet; 18 - Pump filling inlet; 19 - Third exhaust port; 20 - Vacuum oil outlet; 21 - Pump filling line; 22 - First separation tank; 23 - First Roots vacuum pump; 24 - Second Roots vacuum pump; 25 - Third Roots vacuum pump; 26 - Second separation tank; 27 - Liquid ring vacuum pump; 28 - Third separation tank; 29 - Filtering inlet; 30 - Pressure difference gauge; 31 - First filter; 32 - Filtering outlet; 33 - Circulating oil pump; 34 - Cooler; 35 - Cooler inlet; 36 - Cooler outlet; 37 - Third drain port; 38 - Second filter; 39 - Valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present disclosure.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present disclosure, its application, or its use.

[0028] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0029] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0030] The following describes the specific embodiments of the present disclosure in conjunction with the accompanying drawings.

[0031] In this document, "upper", "lower", "front", "rear", "left", "right", etc. are only used to represent the relative positional relationships between relevant parts, rather than defining the absolute positions of these relevant parts.

[0032] In this document, "first", "second", etc. are only used for distinction from each other, rather than indicating importance, order, and the premise of mutual existence, etc.

[0033] In this document, "equal", "same", etc. are not strict mathematical and / or geometric limitations, and also include errors that can be understood by those skilled in the art and are allowed in manufacturing or using, etc.

[0034] In order to prevent impurities such as liquid wax mixed in the gas in the refined wax device from entering the vacuum unit and clogging the pipeline and damaging the vacuum pump during the process of evacuating the refined wax device, the present disclosure provides a vacuum pumping unit system for refined Fischer-Tropsch wax. For ease of understanding, the following will refer to the drawings and, in conjunction with embodiments, detail the specific structure and working principle of a vacuum pumping unit system for refined Fischer-Tropsch wax according to the present disclosure.

[0035] See Figure 1 , in an embodiment of the present disclosure, a vacuum pumping unit system for refined Fischer-Tropsch wax according to the present disclosure includes: a first separation tank 22, a Roots vacuum pump set, a second separation tank 26, and a liquid ring vacuum pump 27.

[0036] The first separation tank 22 is provided with a first inlet 1 and a first exhaust port 2. Among them, the first inlet 1 is configured to communicate with the refined wax device, and the first separation tank 22 is configured to separate the gas and impurities from the refined wax device.

[0037] Specifically, the first separation tank 22 is a gas-liquid separation tank. Its main working principle is that, due to the different densities of gas and liquid, when the liquid and gas flow together, the liquid has a tendency of centrifugal separation because the centrifugal force it receives is greater than that of the gas. Under the action of the centrifugal force, the liquid and gas are separated. The liquid adheres to the wall surface of the first separation tank 22 and converges to the bottom of the first separation tank 22 under the action of gravity, and can be discharged through the first liquid discharge port 3 at the bottom of the first separation tank 22. Among them, the first separation tank 22 is connected to the refined wax device. The gas from the refined wax device is mixed with small liquid drop wax and a small amount of acidic gas, carbon monoxide, hydrogen and other components. The first separation tank 22 can effectively separate the high-melting-point liquid wax in the gas, prevent the high-melting-point liquid wax in the gas from being sucked into the internal pipeline and vacuum pump of the vacuum unit, thereby avoiding the solidification of the high-melting-point liquid wax after cooling, and further blocking the internal pipeline of the vacuum unit and damaging the vacuum pump.

[0038] The Roots vacuum pump set is provided with a first air inlet 4 and an air outlet 9. Among them, the first air inlet 4 is connected to the first exhaust port 2 of the first separation tank 22, and the Roots vacuum pump set is configured to evacuate the refined wax device.

[0039] Specifically, the main working principle of the Roots vacuum pump is to move the gas by the pushing action of a pair of lobe-shaped rotors rotating synchronously and reversely in the pump cavity to achieve air extraction. There is no contact between the rotors and between the rotors and the pump housing. The characteristics of the Roots vacuum pump are simple structure, small volume, low noise, fast air extraction speed, wide vacuum extraction range, etc. Among them, in order to improve the ultimate vacuum degree of the vacuum unit, the Roots vacuum pumps can be used in series to form a Roots vacuum pump set.

[0040] The second separation tank 26 is provided with a second inlet 10 and a second exhaust port 11. Among them, the second inlet 10 is connected to the air outlet 9 of the Roots vacuum pump set, and the second separation tank 26 is configured to separate the gas and impurities from the Roots vacuum pump set.

[0041] Specifically, the working principle of the second separation tank 26 is the same as that of the first separation tank 22, that is, by taking advantage of the different densities of gas, solid and liquid. When the gas flows together with the solid-liquid mixture, due to the centrifugal force acting on the liquid and solid being greater than that on the gas, the liquid and solid tend to undergo centrifugal separation. Under the action of the centrifugal force, the liquid and solid are separated from the gas, and the liquid and solid adhere to the wall of the second separation tank 26 and gather at the bottom of the second separation tank 26 under the action of gravity, and can be discharged through the second liquid discharge port 12 at the bottom of the second separation tank 26. The second separation tank 26 is connected to the Roots vacuum pump set. The gas from the Roots vacuum pump set contains solid impurities, as well as a small amount of acidic gas, carbon monoxide, hydrogen and other components. The solid impurities in the gas come from the Roots vacuum pump set and the internal pipeline. This is because the acidic gas in the gas will corrode the Roots vacuum pump set and the internal pipeline to a certain extent, thus generating solid impurities. The solid impurities are sucked into the second separation tank 26 during the vacuum pumping process for separation, preventing a large amount of solid impurities from entering the liquid ring vacuum pump 27 and causing irreversible damage to the liquid ring vacuum pump 27.

[0042] The liquid ring vacuum pump 27 is provided with a fourth air inlet 13 and a liquid ring vacuum pump outlet 14. Among them, the fourth air inlet 13 is communicated with the second exhaust port 11 of the second separation tank 26, and the liquid ring vacuum pump 27 is configured to compress the gas entering the liquid ring vacuum pump 27 and discharge it through the liquid ring vacuum pump outlet 14.

[0043] Specifically, the liquid ring vacuum pump 27 is a rough vacuum pump using liquid as the working medium. Its specific working principle is that an appropriate amount of working medium is installed inside the liquid ring vacuum pump 27. When the impeller starts to rotate inside the pump body, the working medium is thrown to the surroundings by the impeller. Due to the action of the centrifugal force, the working liquid forms an approximately closed ring with equal thickness determined by the shape of the pump cavity. At this time, a crescent-shaped space is formed between the impeller hub and the closed ring, and this space is divided into several small cavities equal to the number of blades by the impeller. During the rotation of the impeller, the volume of the small cavity increases from small to large and communicates with the suction port, and at this time the gas is sucked in. When the suction is finished, the small cavity is isolated from the suction port. When the impeller continues to rotate, the small cavity decreases from large to small, and the gas is compressed. When the small cavity communicates with the exhaust port, the gas is discharged out of the pump. Among them, the liquid ring vacuum pump 27 of the present application selects vacuum oil as the working medium because the gas components in the refined Fischer-Tropsch wax device are complex, with more impurities and corrosiveness. Compared with other working media, vacuum oil can play a role in avoiding pollution and improving efficiency in this system.

[0044] In one embodiment of the present disclosure, the Roots vacuum pump set includes a first Roots vacuum pump 23. The first Roots vacuum pump 23 is provided with a first air outlet 5 and a first air inlet 4. The first air inlet 4 is communicated with the first exhaust port 2 of the first separation tank 22. The first Roots vacuum pump 23 is configured to evacuate the gas from the refined wax device.

[0045] Specifically, in order to improve the ultimate vacuum degree of the vacuum unit, three Roots vacuum pumps are used in series in this application to form a Roots vacuum pump set. Among them, when the first Roots vacuum pump 23 starts, the air extraction volume per second of the first Roots vacuum pump 23 is 2500 L. The first Roots vacuum pump 23 sucks out the gas from the refined wax device through two mutually rotating impellers in the pump cavity, so that the gas first enters the first separation tank 22 through the first inlet 1 of the first separation tank 22 for separation, and then the gas is extracted from the first exhaust port 2 of the first separation tank 22 and enters the first Roots vacuum pump 23 through the first air inlet 4 of the first Roots vacuum pump 23.

[0046] In one embodiment of the present disclosure, the Roots vacuum pump set includes a second Roots vacuum pump 24. The second Roots vacuum pump 24 is provided with a second air inlet 6 and a second air outlet 7. The second air inlet 6 is communicated with the first air outlet 5 of the first Roots vacuum pump 23. The second Roots vacuum pump 24 is configured to perform secondary evacuation on the gas from the first Roots vacuum pump 23.

[0047] Specifically, when the second Roots vacuum pump 24 starts, the air extraction volume per second of the second Roots vacuum pump 24 is 1200 L. The second Roots vacuum pump 24 sucks out the gas from the first air outlet 5 of the first Roots vacuum pump 23 through two mutually rotating impellers in the pump cavity, so that the gas can enter the second Roots vacuum pump 24 through the second air inlet 6 of the second Roots vacuum pump 24, thereby improving the vacuum quality and reducing the load of the first Roots vacuum pump 23.

[0048] In one embodiment of the present disclosure, the Roots vacuum pump set includes a third Roots vacuum pump 25. The third Roots vacuum pump 25 is provided with a third air inlet 8 and an air outlet 9. The third air inlet 8 is communicated with the second air outlet 7 of the second Roots vacuum pump 24. The third Roots vacuum pump 25 is configured to perform tertiary evacuation on the gas from the second Roots vacuum pump 24.

[0049] Specifically, when the third Roots vacuum pump 25 starts, the air extraction volume per second of the third Roots vacuum pump 25 is 600 L. The third Roots vacuum pump 25 sucks out the gas from the second air outlet 7 of the second Roots vacuum pump 24 through two mutually rotating impellers in the pump cavity, so that the gas can enter the third Roots vacuum pump 25 through the third air inlet 8 of the third Roots vacuum pump 25, thereby improving the vacuum quality and reducing the loads of the first Roots vacuum pump 23 and the second Roots vacuum pump 24.

[0050] In one embodiment of the present disclosure, the refined Fischer-Tropsch wax vacuum pumping unit system further includes: a third separation tank 28, a filtering device, and a cooler 34.

[0051] The third separation tank 28 is provided with a third inlet 16, a third exhaust port 19, and a vacuum oil outlet 20. Among them, the third inlet 16 is communicated with the outlet 14 of the liquid ring vacuum pump, and the third separation tank 28 is configured to separate the gas and vacuum oil from the liquid ring vacuum pump 27.

[0052] Specifically, the third separation tank 28 is a gas-liquid separation tank. The gas and vacuum oil are discharged from the outlet 14 of the liquid ring vacuum pump and enter the third separation tank 28 through the third inlet 16 of the third separation tank 28. Due to the different densities of the gas and the vacuum oil, the centrifugal force acting on the vacuum oil is greater than that of the gas. Therefore, under the action of the centrifugal force, the vacuum oil is separated from the gas. The gas is discharged through the third exhaust port 19 located at the top of the third separation tank 28, and the discharged gas will enter the waste gas combustion furnace ( Figure 1 (not shown in the figure)) for treatment to prevent environmental pollution. The separated vacuum oil is discharged through the vacuum oil outlet 20 of the third separation tank 28. Among them, the third separation tank 28 is further provided with a third drain port 37 for discharging the substances in the third separation tank 28 during subsequent maintenance of the third separation tank 28.

[0053] The filtering device is provided with a filtering inlet 29 and a filtering outlet 32. The filtering inlet 29 is communicated with the vacuum oil outlet 20 of the third separation tank 28, and the filtering device is configured to filter the impurities in the vacuum oil.

[0054] Specifically, the filtering inlet 29 of the filtering device is communicated with the vacuum oil outlet 20 of the third separation tank 28, and the vacuum oil discharged from the third separation tank 28 flows into the filtering device through a pipeline. Among them, the filtering device is used to filter the solid impurities that may be mixed in the vacuum oil to prevent the deposition of solid impurities in the vacuum oil, thereby affecting the normal operation of the liquid ring vacuum pump 27. The solid impurities that may be mixed come from the fact that the acidic gas may corrode the subsequent pipelines and devices of the second separator to a certain extent, and the solid impurities generated by the corrosion will enter the vacuum oil under the action of the liquid ring vacuum pump 27. If the above solid impurities are not filtered, a large amount of solid impurities will eventually enter the liquid ring vacuum pump 27, damaging the liquid ring vacuum pump 27 and thus affecting the normal operation of the vacuum pumping unit.

[0055] The cooler 34 is provided with a cooler inlet 35 and a cooler outlet 36. The cooler inlet 35 is communicated with the filtering outlet 32 of the filtering device, and the cooler outlet 36 is communicated with the liquid ring vacuum pump 27. The cooler 34 is configured to cool down the vacuum oil.

[0056] Specifically, the cooler inlet 35 is communicated with the filtration outlet 32 of the filtration device. The vacuum oil obtained after being filtered by the filtration device enters the cooler 34 through the cooler inlet 35 for temperature reduction. The reason for setting the cooler 34 is that during the operation of the liquid ring vacuum pump 27, the vacuum oil in the liquid ring vacuum pump 27 will increase in temperature under the action of the impeller rotation. If the cooler 34 is not set to cool the vacuum oil, the temperature of the vacuum oil in the liquid ring vacuum pump 27 will become higher and higher, and finally the liquid ring vacuum pump 27 will be damaged.

[0057] In an embodiment of the present disclosure, the filtration device is configured to include a first filter 31 and a second filter 38, and the first filter 31 and the second filter 38 are arranged in parallel.

[0058] Specifically, the first filter 31 and the second filter 38 are arranged in parallel for one-open-one-backup use. When the first filter 31 fails, the second filter 38 is put into use as a backup filter to prevent the entire refined Fischer-Tropsch wax vacuum pumping unit from not working properly due to the blockage of the first filter 31, thereby affecting the work efficiency.

[0059] In an embodiment of the present disclosure, differential pressure gauges 30 and valves 39 are respectively arranged at both ends of the first filter 31 and the second filter 38.

[0060] Specifically, differential pressure gauges 30 and valves 39 are added at both ends of the first filter 31. The two differential pressure gauges 30 and the two valves 39 are symmetrically arranged with the first filter 31 as the reference. During the overhaul of the first filter 31, if the readings of the differential pressure gauges 30 at both ends of the first filter 31 are inconsistent, it means that the first filter 31 is blocked. At this time, the valves 39 at both ends of the first filter 31 are closed, and the valves 39 at both ends of the backup filter, that is, the second filter 38, are opened to allow the second filter 38 to replace the first filter 31 for work.

[0061] In an embodiment of the present disclosure, the liquid ring vacuum pump 27 is further provided with a pump priming line 21, wherein the pump priming line 21 is configured to provide initial vacuum oil for the liquid ring vacuum pump 27.

[0062] Specifically, in the initial state, no vacuum oil is introduced into the liquid ring vacuum pump 27, and at this time, the liquid ring vacuum pump 27 cannot be started normally. Therefore, in this application, a pump priming line 21 is provided between the liquid ring vacuum pump 27 and the third separation tank 28. This line is only opened before the liquid ring vacuum pump 27 is started, and after the required liquid level is reached in the liquid ring vacuum pump 27, this line is closed.

[0063] In one embodiment of the present disclosure, the third separation tank 28 is further provided with a filling pump inlet 18 and a filling pump outlet 17. Among them, the filling pump inlet 18 is arranged at the top of the third separation tank 28 and is used to introduce vacuum oil into the third separation tank 28 and the liquid ring vacuum pump 27. The filling pump outlet 17 is communicated with the liquid ring vacuum pump 27 through a filling pump line 21.

[0064] Specifically, a filling pump inlet 18 is arranged at the top of the third separation tank 28, so that the initial vacuum oil can enter the third separation tank 28 through the filling pump inlet 18. The filling pump line 21 is opened, so that the initial vacuum oil can be discharged from the filling pump outlet 17, flow through the filling pump line 21 and enter the liquid ring vacuum pump 27. When the vacuum oil in the liquid ring vacuum pump 27 reaches the required liquid level, the filling pump line 21 is closed, and vacuum oil is continuously injected into the third separation tank 28 through the filling pump inlet 18. After the vacuum oil in the third separation tank 28 reaches the required liquid level, the filling pump inlet 18 is closed. The reason for continuously injecting vacuum oil into the third separation tank 28 is that the process of the liquid ring vacuum pump 27 pumping vacuum is a dynamic process. The vacuum oil in the pump chamber of the liquid ring vacuum pump 27 will enter the third separation tank 28 together with the gas. Therefore, in order to maintain the stability of the vacuum oil content in the liquid ring vacuum pump 27 and prevent the liquid ring vacuum pump 27 from reducing the vacuum oil content in the pump chamber due to normal operation, the third separation tank 28 is configured to play both the role of gas-liquid separation and the role of an oil storage tank. When the vacuum oil in the liquid ring vacuum pump 27 enters the third separation tank 28, the liquid level of the original vacuum oil inside the third separation tank 28 rises. After the third separation tank 28 detects the rise of the internal liquid level, the increased part of the vacuum oil is discharged through the vacuum oil outlet 20 to the filtration device and the cooler 34, and finally the reduced vacuum oil in the liquid ring vacuum pump 27 returns to the liquid ring vacuum pump 27 through the liquid inlet 15 at the bottom of the liquid ring vacuum pump 27, achieving a dynamic balance, so that the liquid ring vacuum pump 27 can continuously operate.

[0065] In one embodiment of the present disclosure, the refined Fischer-Tropsch wax vacuum pumping unit system further includes a circulating oil pump 33. The circulating oil pump 33 is arranged between the filtration device and the cooler 34 and is used to provide power for passing the vacuum oil from the filtration device into the cooler 34.

[0066] Specifically, one end of the circulating oil pump 33 is communicated with the filtration outlet 32 of the filtration device, and the other end is communicated with the cooler inlet 35 of the cooler 34. Since the liquid ring vacuum pump 27 can only compress and discharge gas, for the internal vacuum oil, the liquid ring vacuum pump 27 is not sufficient to make the vacuum oil pass through the filtration device and then enter the cooler 34 and finally return to the liquid ring vacuum pump 27. Therefore, a circulating oil pump 33 is added between the filtration device and the cooler 34 to provide power for passing the vacuum oil from the filtration device into the cooler 34 and returning the vacuum oil to the liquid ring vacuum pump 27.

[0067] The refined Fischer-Tropsch wax vacuum pumping unit system provided by the present disclosure is provided with a first separation tank 22 and a second separation tank 26. The first separation tank 22 is used for the preliminary separation of gases and impurities from the refined wax device, and the second separation tank 26 is used for the separation of solid impurities generated after the pipeline and device are corroded by acidic gases, preventing a large amount of solid impurities from entering the vacuum pumping unit and causing blockage of the internal pipeline of the vacuum pumping unit and damage to the vacuum pump.

[0068] It should be noted that for the foregoing method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present disclosure is not limited by the described action sequence, because according to the present disclosure, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily all essential to the present disclosure.

[0069] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] The preferred embodiments of the present disclosure disclosed above are only used to help explain the present disclosure. The alternative embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of the present disclosure. The present disclosure selects and specifically describes these embodiments to better explain the principles and practical applications of the present disclosure, so that those skilled in the art can well understand and utilize the present disclosure. The present disclosure is only limited by the claims and their full scope and equivalents.

Claims

1. A refined Fischer-Tropsch wax vacuum pumping unit system, characterized in that, Comprising: A first separation tank (22) provided with a first inlet (1) and a first exhaust port (2), wherein the first inlet (1) is configured to communicate with a refined wax device, and the first separation tank (22) is configured to separate gases and impurities from the refined wax device; A Roots vacuum pump set provided with a first air inlet (4) and an air outlet (9), wherein the first air inlet (4) communicates with the first exhaust port (2) of the first separation tank (22), and the Roots vacuum pump set is configured to evacuate the refined wax device; A second separation tank (26) provided with a second inlet (10) and a second exhaust port (11), wherein the second inlet (10) communicates with the air outlet (9) of the Roots vacuum pump set, and the second separation tank (26) is configured to separate gases and impurities from the Roots vacuum pump set; A liquid ring vacuum pump (27) provided with a fourth air inlet (13) and a liquid ring vacuum pump outlet (14), wherein the fourth air inlet (13) communicates with the second exhaust port (11) of the second separation tank (26), and the liquid ring vacuum pump (27) is configured to compress the gases entering the liquid ring vacuum pump (27) and discharge them through the liquid ring vacuum pump outlet (14).

2. The system according to claim 1, wherein The Roots vacuum pump set includes a first Roots vacuum pump (23) provided with a first air outlet (5) and the first air inlet (4), the first air inlet (4) communicates with the first exhaust port (2) of the first separation tank (22), and the first Roots vacuum pump (23) is configured to evacuate the gases from the refined wax device.

3. The system according to claim 2, wherein The Roots vacuum pump set includes a second Roots vacuum pump (24) provided with a second air inlet (6) and a second air outlet (7), the second air inlet (6) communicates with the first air outlet (5) of the first Roots vacuum pump (23), and the second Roots vacuum pump (24) is configured to perform secondary evacuation on the gases from the first Roots vacuum pump (23).

4. The system according to claim 3, wherein The Roots vacuum pump set includes a third Roots vacuum pump (25) provided with a third air inlet (8) and the air outlet (9), the third air inlet (8) communicates with the second air outlet (7) of the second Roots vacuum pump (24), and the third Roots vacuum pump (25) is configured to perform tertiary evacuation on the gases from the second Roots vacuum pump (24).

5. The system according to claim 1, wherein Further comprising: A third separation tank (28) provided with a third inlet (16), a third exhaust port (19), and a vacuum oil outlet (20), wherein the third inlet (16) communicates with the liquid ring vacuum pump outlet (14), and the third separation tank (28) is configured to separate gases and vacuum oil from the liquid ring vacuum pump (27); Filter device, the filter device is provided with a filter inlet (29) and a filter outlet (32), the filter inlet (29) is communicated with the vacuum oil outlet (20) of the third separation tank (28), and the filter device is configured to filter impurities in the vacuum oil; Cooler (34), the cooler (34) is provided with a cooler inlet (35) and a cooler outlet (36), the cooler inlet (35) is communicated with the filter outlet (32) of the filter device, and the cooler outlet (36) is communicated with the liquid ring vacuum pump (27), and the cooler (34) is configured to cool the vacuum oil.

6. The system according to claim 1, wherein The liquid ring vacuum pump (27) is further provided with a pump priming line (21), wherein the pump priming line (21) is configured to provide initial vacuum oil for the liquid ring vacuum pump (27).

7. The system according to claim 6, wherein The third separation tank (28) is further provided with a pump priming inlet (18) and a pump priming outlet (17), wherein the pump priming inlet (18) is arranged at the top of the third separation tank (28) for introducing vacuum oil into the third separation tank (28) and the liquid ring vacuum pump (27), and the pump priming outlet (17) is communicated with the liquid ring vacuum pump (27) through the pump priming line (21).

8. The system according to claim 5, wherein It further includes a circulation oil pump (33), and the circulation oil pump (33) is configured between the filter device and the cooler (34) to provide power for passing the vacuum oil from the filter device into the cooler (34).

9. The system according to claim 5, wherein The filter device is constructed to include a first filter (31) and a second filter (38), and the first filter (31) and the second filter (38) are arranged in parallel.

10. The system according to claim 9, characterized in that, Differential pressure gauges (30) and valves (39) are respectively arranged at both ends of the first filter (31) and the second filter (38).

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