Coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system

Abstract

The coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system comprises an oil-water separator, a coarse filter and a fine filter, a liquid outlet of the oil-water separator is communicated with a liquid inlet of the coarse filter, a first liquid outlet of the coarse filter is communicated with a liquid inlet of the fine filter, and a first liquid outlet of the fine filter is communicated with a filtered liquid pipeline; and air outlets of the coarse filter and the fine filter are both communicated with a discharge header pipe. The system effectively solves the problem of catalyst escape in the coal-to-liquid Fischer-Tropsch synthesis process, the coarse filtration system can recover 98% of the catalyst in the oil phase, the fine filtration can improve the catalyst recovery efficiency to 99.9%, the filtered catalyst is recycled, the cost is saved, and the waste of the catalyst is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal chemical industry, and in particular relates to a coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system. Background Art

[0002] In the coal chemical Fischer-Tropsch synthesis process, the synthesis gas is maintained at a certain temperature and pressure for reaction under the catalytic action of the catalyst to generate light distillate oil, heavy distillate oil and other products. In the actual production process, part of the catalyst in the slurry bed reactor is easily carried out from the top of the tower by the gaseous medium generated by the reaction. Moreover, as the production time increases, the catalyst wears more seriously and becomes a finer powder, which is more easily carried out of the reactor by the gaseous medium. On the one hand, it causes a waste of catalyst. On the other hand, the light distillate oil catalyst content in the Fischer-Tropsch synthesis product is too high, which affects the normal operation of subsequent processes and the quality of the final product. Therefore, it is necessary to design a coal-to-oil Fischer-Tropsch synthesis catalyst recovery system. Utility Model Content

[0003] Therefore, the utility model aims to solve the problems of catalyst waste and excessively high catalyst content in light distillate oil in the prior art.

[0004] To this end, the technical solution adopted is that a coal-to-oil Fischer-Tropsch synthesis catalyst recovery system of the utility model includes: an oil-water separator, a coarse filter and a fine filter, the liquid outlet of the oil-water separator is connected to the liquid inlet of the coarse filter, the first liquid outlet of the coarse filter is connected to the liquid inlet of the fine filter, the first liquid outlet of the fine filter is connected to the filtered liquid pipeline, and the gas outlets of the coarse filter and the fine filter are both connected to the discharge and discharge main pipe.

[0005] Preferably, the liquid inlet of the spare coarse filter is connected to the liquid outlet of the oil-water separator, the first liquid outlet of the spare coarse filter is connected to the liquid inlet of the fine filter, the second liquid outlet and the third liquid outlet of the coarse filter are respectively connected to the liquid inlet of the coarse slag tank, the second liquid outlet and the third liquid outlet of the spare coarse filter are respectively connected to the liquid inlet of the spare coarse slag tank, the air inlets of the coarse filter and the spare coarse filter are both connected to the air outlet of the nitrogen tank, the air outlets of the spare coarse filter, the coarse slag tank and the spare coarse slag tank are all connected to the discharge main pipe, and the discharge ports of the coarse slag tank and the spare coarse slag tank are connected to the reactor.

[0006] Preferably, the second liquid outlet and the third liquid outlet of the fine filter are both connected to the liquid inlet of the fine slag tank, the first liquid outlet of the fine slag tank is connected to the reactor, the first liquid outlet of the coarse filter and the spare coarse filter are both connected to the liquid inlet of the spare fine filter, the first liquid outlet of the spare fine filter is connected to the filtered liquid pipeline, the second liquid outlet and the third liquid outlet of the spare fine filter are both connected to the liquid inlet of the fine slag tank, the air outlet of the nitrogen tank is respectively connected to the first liquid outlet of the fine filter, the first liquid outlet of the spare fine filter and the air inlet of the fine slag tank, the second liquid outlet and the third liquid outlet of the spare fine filter are both connected to the liquid inlet of the fine slag tank, and the air outlets of the fine slag tank and the spare fine filter are both connected to the discharge main pipe.

[0007] Preferably, the air inlet of the first gas-liquid separator is connected to the air outlet of the fine filter, the air outlet of the first gas-liquid separator is connected to the discharge main pipe, and the liquid outlet of the first gas-liquid separator is connected to the liquid inlet of the fine slag tank.

[0008] Preferably, the air inlet of the second gas-liquid separator is connected to the air outlet of the spare fine filter, the air outlet of the second gas-liquid separator is connected to the discharge main pipe, and the liquid outlet of the second gas-liquid separator is connected to the liquid inlet of the fine slag tank.

[0009] Preferably, the second liquid outlet of the fine slag tank is connected to the liquid inlet of the delivery pump, and the liquid outlet of the delivery pump is respectively connected to the liquid inlets of the coarse filter and the spare coarse filter.

[0010] Preferably, the pressurized air is communicated with the air inlets of the coarse slag tank and the spare coarse slag tank respectively.

[0011] Preferably, the first liquid outlets of the coarse slag tank, the spare coarse slag tank and the fine slag tank are all connected to the centralized processing pipeline.

[0012] Preferably, the liquid outlet of the oil-water separator is communicated with the liquid outlet of the delivery pump through a first pipeline, the liquid inlet of the coarse filter is communicated with the first pipeline through a second pipeline, the liquid inlet of the spare coarse filter is communicated with the first pipeline through a third pipeline, a pneumatic regulating valve is arranged on the first pipeline, a first flow control valve is arranged on the second pipeline, a second flow control valve is arranged on the third pipeline, the first liquid outlet of the coarse filter is communicated with the liquid inlet of the spare fine filter through a fourth pipeline, a third flow control valve is arranged on one end of the fourth pipeline close to the coarse filter, a fourth flow control valve is arranged on one end of the fourth pipeline close to the spare fine filter, the first liquid outlet of the spare coarse filter is communicated with the fourth pipeline through a fifth pipeline, the liquid inlet of the fine filter is communicated with the fourth pipeline through a sixth pipeline, a fifth flow control valve is arranged on the fifth pipeline, a sixth flow control valve is arranged on the sixth pipeline, and three are arranged on the first liquid outlet of the fine filter. And they are respectively connected with the filtered liquid pipeline through three seventh pipelines, and the seventh pipeline is provided with a seventh flow control valve. The coarse filter outlet is connected with the venting main pipe through an eighth pipeline, and the eighth pipeline is provided with an eighth flow control valve. The spare coarse filter outlet is connected with the eighth pipeline through a ninth pipeline, and the ninth pipeline is provided with a ninth flow control valve. The fine filter outlet is connected with the first gas-liquid separator air inlet through a tenth pipeline, and the tenth flow control valve is provided on the tenth pipeline. The first gas-liquid separator air outlet is connected with the eighth pipeline through an eleventh pipeline, and the eleventh flow control valve is provided on the eleventh pipeline. The spare fine filter outlet is connected with the second gas-liquid separator air inlet through a twelfth pipeline, and the twelfth pipeline is provided with a twelfth flow control valve. The second gas-liquid separator air outlet is connected with the eighth pipeline through a thirteenth pipeline, and the thirteenth pipeline is provided with a thirteenth flow control valve.

[0013] Preferably, the air outlet of the nitrogen tank is connected to the air inlet of the coarse filter through a fourteenth pipeline, a fourteenth flow control valve is provided at one end of the fourteenth pipeline close to the nitrogen tank, a fifteenth flow control valve is provided at one end of the fourteenth pipeline close to the coarse filter, the air inlet of the spare coarse filter is connected to the fourteenth pipeline through the fifteenth pipeline, a sixteenth flow control valve is provided on the fifteenth pipeline, the fourteenth pipeline is respectively connected to the three seventh pipelines through the three sixteenth pipelines, a seventeenth flow control valve is provided on the sixteenth pipeline, three first liquid outlets of the spare fine filter are provided, and they are respectively connected to the filtered liquid pipeline through three seventeenth pipelines, an eighteenth flow control valve is provided on the seventeenth pipeline, the fourteenth pipeline is respectively connected to the three seventeenth pipelines through the eighteenth pipeline, and the tenth pipeline is respectively connected to the three seventeenth pipelines through the eighteenth pipeline. The eight pipelines are provided with a nineteenth flow control valve, the second liquid outlet of the coarse filter is connected to the liquid inlet of the coarse slag tank through the nineteenth pipeline, the nineteenth pipeline is provided with a twentieth flow control valve, the third liquid outlet of the coarse filter is connected to the nineteenth pipeline through the twentieth pipeline, the twentieth pipeline is provided with a twenty-first flow control valve, the second liquid outlet of the spare coarse filter is connected to the liquid inlet of the spare coarse slag tank through the twenty-first pipeline, the twenty-second flow control valve is provided on the twenty-first pipeline, the third liquid outlet of the spare coarse filter is connected to the twenty-first pipeline through the twenty-second pipeline, the twenty-third flow control valve is provided on the twenty-second pipeline, the second liquid outlet of the fine filter is connected to the liquid inlet of the fine slag tank through the twenty-third pipeline, and the twenty-fourth flow control valve is provided on the twenty-third pipeline , the third liquid outlet of the fine filter is connected to the twenty-third pipeline through the twenty-fourth pipeline, and a twenty-fifth flow control valve is provided on the twenty-fourth pipeline. The liquid outlet of the first gas-liquid separator is connected to the twenty-third pipeline through the twenty-fifth pipeline, and a twenty-sixth flow control valve is provided on the twenty-fifth pipeline. The second liquid outlet of the standby fine filter is connected to the twenty-third pipeline through the twenty-sixth pipeline, and a twenty-seventh flow control valve is provided on the twenty-sixth pipeline. The third liquid outlet of the standby fine filter is connected to the twenty-third pipeline through the twenty-seventh pipeline, and a twenty-eighth flow control valve is provided on the twenty-seventh pipeline. The liquid outlet of the second gas-liquid separator is connected to the twenty-third pipeline through the twenty-eighth pipeline, and a twenty-ninth flow control valve is provided on the twenty-eighth pipeline. The gas outlet of the coarse slag tank is connected to the The eight pipelines are connected through the twenty-ninth pipeline, the twenty-ninth pipeline is provided with a first pressure valve, the air outlet of the spare coarse slag tank is connected to the eighth pipeline through the thirtieth pipeline, the second pressure valve is provided on the thirtieth pipeline, the air outlet of the fine slag tank is connected to the eighth pipeline through the thirty-first pipeline, the thirtieth flow control valve is provided on the thirty-first pipeline, the pressure-feeding air pipe is connected to the air inlet of the coarse slag tank through the thirty-second pipeline, the third pressure valve is provided on the thirty-second pipeline, the pressure-feeding air pipe is connected to the air inlet of the spare coarse slag tank through the thirty-third pipeline, the fourth pressure valve is provided on the thirty-third pipeline, the liquid outlet of the coarse slag tank is connected to the reactor through the thirty-fourth pipeline, the thirty-first flow control valve is provided on the thirty-fourth pipeline, the liquid outlet of the spare coarse slag tank is connected to the reactor through the thirty-fifth pipeline,The 35th pipeline is provided with a 32nd flow control valve, the first liquid outlet of the fine slag tank is connected with the reactor through the 36th pipeline, and the 36th pipeline is provided with a 33rd flow control valve.

[0014] The technical solution of the utility model has the following advantages: the system effectively solves the problem of catalyst escape in the coal-to-oil Fischer-Tropsch synthesis process, the coarse filtration system can recover 98% of the catalyst in the oil phase, and the fine filtration can increase the catalyst recovery efficiency to 99.9%, and the filtered catalyst is recovered and reused, saving costs and reducing catalyst waste.

[0015] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures particularly pointed out in the written description and the drawings.

[0016] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Among them, 1. oil-water separator; 2. coarse filter; 3. fine filter; 4. nitrogen tank; 5. spare coarse filter; 6. coarse slag tank; 7. spare coarse slag tank; 8. fine slag tank; 9. spare fine filter; 10. first gas-liquid separator; 11. second gas-liquid separator; 12. delivery pump; 13. first pipeline; 14. second pipeline; 15. third pipeline; 16. pneumatic regulating valve; 17. first flow control valve; 18. second flow control valve; 19. fourth pipeline; 20. third flow control valve; 21. fourth flow control valve; 22. fifth pipeline; 23. sixth pipeline; 24. fifth flow control valve; 25. sixth flow control valve; 26, the seventh pipeline; 27, the seventh flow control valve; 28, the eighth pipeline; 29, the eighth flow control valve; 30, the ninth pipeline; 31, the ninth flow control valve; 32, the tenth pipeline; 33, the tenth flow control valve; 34, the eleventh pipeline; 35, the eleventh flow control valve; 36, the twelfth pipeline; 37, the twelfth flow control valve; 38, the thirteenth pipeline; 39, the thirteenth flow control valve; 40, the fourteenth pipeline; 41, the fourteenth flow control valve; 42, the fifteenth flow control valve; 43, the fifteenth pipeline; 44, the sixteenth flow control valve; 45, the sixteenth pipeline; 46, the seventeenth flow control valve; 47, the 17th pipeline; 48, the 18th flow control valve; 49, the 18th pipeline; 50, the 19th flow control valve; 51, the 19th pipeline; 52, the 20th flow control valve; 53, the 20th pipeline; 54, the 21st flow control valve; 55, the 21st pipeline; 56, the 22nd flow control valve; 57, the 22nd pipeline; 58, the 23rd flow control valve; 59, the 23rd pipeline; 60, the 24th flow control valve; 61, the 24th pipeline; 62, the 25th flow control valve; 63, the 25th pipeline; 64, the 26th flow control valve; 65, the 26th pipeline; 66, the 27th Flow control valve; 67, the twenty-seventh pipeline; 68, the twenty-eighth flow control valve; 69, the twenty-eighth pipeline; 70, the twenty-ninth flow control valve; 71, the twenty-ninth pipeline; 72, the first pressure valve; 73, the thirtieth pipeline; 74, the second pressure valve; 75, the thirty-first pipeline; 76, the thirtieth flow control valve; 77, the thirty-second pipeline; 78, the third pressure valve; 79, the thirty-third pipeline; 80, the fourth pressure valve; 81, the thirty-fourth pipeline; 82, the thirty-first flow control valve; 83, the thirty-fifth pipeline; 84, the thirty-second flow control valve; 85, the thirty-sixth pipeline; 86, the thirty-third flow control valve. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] The utility model provides a coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system, such as Figure 1 As shown, it includes: an oil-water separator 1, a coarse filter 2 and a fine filter 3. The liquid outlet of the oil-water separator 1 is connected to the liquid inlet of the coarse filter 2, the first liquid outlet of the coarse filter 2 is connected to the liquid inlet of the fine filter 3, the first liquid outlet of the fine filter 3 is connected to the filtered liquid pipeline, and the gas outlets of the coarse filter 2 and the fine filter 3 are both connected to the discharge main pipe. The coarse filter 2 can filter catalysts above 5 microns, and the fine filter 3 can filter catalysts above 1 micron.

[0025] The working principle and beneficial technical effects of the above technical solution are as follows: the light distillate oil produced by the reactor is separated from the water by the oil-water separator 1, the water is removed, and the liquid enters the coarse filter 2 to recover the 5-micron catalyst. The gas in the coarse filter 2 is discharged to the main pipe through the outlet of the coarse filter 2. After that, the liquid enters the fine filter 3 to filter the catalyst above 1 micron in the liquid 1. The filtered catalyst is recovered and reused, which saves costs and reduces the waste of catalysts. The filtered liquid enters the filtered liquid pipeline for further processing.

[0026] In one embodiment, Figure 1 As shown, the liquid inlet of the spare coarse filter 5 is connected with the liquid outlet of the oil-water separator 1, the first liquid outlet of the spare coarse filter 5 is connected with the liquid inlet of the fine filter 3, the second and third liquid outlets of the coarse filter 2 are respectively connected with the liquid inlet of the coarse slag tank 6, the second and third liquid outlets of the spare coarse filter 5 are respectively connected with the liquid inlet of the spare coarse slag tank 7, the air inlets of the coarse filter 2 and the spare coarse filter 5 are both connected with the air outlet of the nitrogen tank 4, the air outlets of the spare coarse filter 5, the coarse slag tank 6 and the spare coarse slag tank 7 are all connected with the discharge main pipe, and the discharge ports of the coarse slag tank 6 and the spare coarse slag tank 7 are connected with the reactor. Nitrogen is filled into the liquid, and the filter element of the filter can be cleaned through the disturbance of the airflow.

[0027] The working principle and beneficial technical effects of the above technical scheme are as follows: the spare coarse filter 5, the coarse slag tank 6, and the spare coarse slag tank 7 are used for filter backwashing. When the filter element in the coarse filter 2 is used for a long time, it will be blocked. When the pressure on both sides of the filter element is greater than or equal to 0.1MPa, the coarse filter 2 is backwashed, the spare coarse filter 5 is started, the liquid inlet and liquid outlet of the coarse filter 2 are closed, and the coarse filter 2 is backwashed by pulse nitrogen. When the backwashing is completed, the backwashed slag liquid is discharged into the coarse slag tank 6; when the spare coarse filter 5 needs to be backwashed, the coarse filter 2 is started, the liquid inlet and liquid outlet of the spare coarse filter 5 are closed, and the spare coarse filter 5 is backwashed by pulse nitrogen. When the backwashing is completed, the backwashed slag liquid is discharged into the spare coarse slag tank 7. By backwashing the filter, the filter element of the filter is reused, thereby increasing the service life of the filter element.

[0028] In one embodiment, the second liquid outlet and the third liquid outlet of the fine filter 3 are both connected to the liquid inlet of the fine slag tank 8, the first liquid outlet of the fine slag tank 8 is connected to the reactor, the first liquid outlet of the coarse filter 2 and the spare coarse filter 5 are both connected to the liquid inlet of the spare fine filter 9, the first liquid outlet of the spare fine filter 9 is connected to the filtered liquid pipeline, the second liquid outlet and the third liquid outlet of the spare fine filter 9 are both connected to the liquid inlet of the fine slag tank 8, the air outlet of the nitrogen tank 4 is respectively connected to the first liquid outlet of the fine filter 3, the first liquid outlet of the spare fine filter 9 and the air inlet of the fine slag tank 8, the second liquid outlet and the third liquid outlet of the spare fine filter 9 are both connected to the liquid inlet of the fine slag tank 8, and the air outlets of the fine slag tank 8 and the spare fine filter 9 are both connected to the discharge main pipe.

[0029] The working principle and beneficial technical effects of the above technical solution are as follows: when the pressure difference on both sides of the filter element of the fine filter 3 is greater than or equal to 0.1 MPa, the fine filter needs to be backwashed, the standby fine filter 9 is activated, the liquid inlet and the three first liquid outlets of the fine filter 3 are closed, and nitrogen pulse backwashing is performed to the three first liquid outlets of the fine filter 3 in turn. The slag liquid after backwashing is discharged into the fine slag tank 8, and the filter element of the fine filter 3 is reused to increase the service life of the filter.

[0030] In one embodiment, Figure 1 As shown, the air inlet of the first gas-liquid separator 10 is connected to the air outlet of the fine filter 3, the air outlet of the first gas-liquid separator 10 is connected to the discharge main pipe, and the liquid outlet of the first gas-liquid separator 10 is connected to the liquid inlet of the fine slag tank 8. The gas at the air outlet of the fine filter 3 contains a small amount of catalyst, which is separated into gas and liquid by the first gas-liquid separator 10, and the gas is discharged into the discharge main pipe, and the liquid is discharged into the fine slag tank 8 for catalyst recovery.

[0031] In one embodiment, Figure 1 As shown, the air inlet of the second gas-liquid separator 11 is connected to the air outlet of the spare fine filter 9, the air outlet of the second gas-liquid separator 11 is connected to the discharge main pipe, and the liquid outlet of the second gas-liquid separator 11 is connected to the liquid inlet of the fine slag tank 8. The gas at the air outlet of the spare fine filter 9 will contain a small amount of catalyst, which is separated into gas and liquid by the second gas-liquid separator 11, and the gas is discharged into the discharge main pipe, and the liquid is discharged into the fine slag tank 8 for catalyst recovery.

[0032] In one embodiment, Figure 1 As shown, the second liquid outlet of the fine slag tank 8 is connected to the liquid inlet of the delivery pump 12, and the liquid outlet of the delivery pump 12 is respectively connected to the liquid inlets of the coarse filter 2 and the spare coarse filter 5. After the fine filter 3 is backwashed, the slag liquid is discharged into the fine slag tank 8. Since the catalyst powder in the fine slag liquid is finer and the catalyst content is relatively lower than that in the coarse slag liquid, the fine slag liquid naturally settles in the fine slag tank 8, so that the catalyst powder settles to the bottom of the tank cone. After the fine filter 3 is backwashed several times, when the liquid level of the fine slag tank reaches more than 80%, the delivery pump 12 is used to transport the clear liquid after the upper part of the fine slag tank 8 settles to the liquid inlet of the coarse filter 2 for secondary filtration. The catalyst powder at the bottom of the fine slag tank 8 is analyzed for activity to determine its destination. If the catalyst is active, it is discharged to the coarse slag tank 6 and then pressure-sent to the reactor for recycling. If the catalyst is inactive, it is discharged to the centralized processing pipeline for unified treatment.

[0033] In one embodiment, Figure 1As shown, the compressed gas is connected to the air inlet of the crude slag tank 6 and the spare crude slag tank 7 respectively, so that the slag liquid is hydraulically delivered to the reactor with a working pressure of 3.5MPa by using the 4.3MPa raw gas in the production process. Since the catalyst particles in the crude slag liquid are large and the content is high, and the reactor pressure is high, if a conventional delivery pump is used to deliver the crude slag to the reactor, the pump selection is difficult, and the pump is very prone to failure, there are safety hazards such as leakage, and it is not conducive to the stable operation of the entire system. The use of gas compression can effectively solve the above problems, and it is easy to operate and has high delivery efficiency.

[0034] In one implementation, Figure 1 As shown, the first liquid outlets of the coarse slag tank 6, the spare coarse slag tank 7 and the fine slag tank 8 are all connected to the centralized processing pipeline, so that the inactive catalysts in each tank are discharged and processed in a centralized manner.

[0035] In one embodiment, Figure 1As shown, the liquid outlet of the oil-water separator 1 is connected to the liquid outlet of the delivery pump 12 through a first pipeline 13, the liquid inlet of the coarse filter 2 is connected to the first pipeline 13 through a second pipeline 14, the liquid inlet of the spare coarse filter 5 is connected to the first pipeline 13 through a third pipeline 15, a pneumatic regulating valve 16 is provided on the first pipeline 13, a first flow control valve 17 is provided on the second pipeline 14, and a second flow control valve 18 is provided on the third pipeline 15. The first liquid outlet of the coarse filter 2 is connected to the liquid inlet of the spare fine filter 9 through a fourth pipeline 19, a third flow control valve 20 is provided at one end of the fourth pipeline 19 close to the coarse filter 2, and a fourth flow control valve 21 is provided at one end of the fourth pipeline 19 close to the spare fine filter 9. The first liquid outlet of the spare coarse filter 5 is connected to the fourth pipeline 19 through a fifth pipeline 22, the liquid inlet of the fine filter 3 is connected to the fourth pipeline 19 through a sixth pipeline 23, a fifth flow control valve 24 is provided on the fifth pipeline 22, and a sixth flow control valve 25 is provided on the sixth pipeline 23. The first liquid outlet of the fine filter 3 is provided with three, and The air outlet of the coarse filter 2 is connected to the exhaust main pipe through an eighth pipe 28, and an eighth flow control valve 29 is provided on the eighth pipe 28. The air outlet of the spare coarse filter 5 is connected to the eighth pipe 28 through a ninth pipe 30, and a ninth flow control valve 31 is provided on the ninth pipe 30. The air outlet of the fine filter 3 is connected to the air inlet of the first gas-liquid separator 10 through a tenth pipe 32, and a tenth pipe 32 is provided on the tenth pipe 32. The tenth flow control valve 33 is provided, the air outlet of the first gas-liquid separator 10 is connected to the eighth pipeline 28 through the eleventh pipeline 34, the eleventh flow control valve 35 is provided on the eleventh pipeline 34, the air outlet of the spare fine filter 9 is connected to the air inlet of the second gas-liquid separator 11 through the twelfth pipeline 36, the twelfth flow control valve 37 is provided on the twelfth pipeline 36, the air outlet of the second gas-liquid separator 11 is connected to the eighth pipeline 28 through the thirteenth pipeline 38, the thirteenth flow control valve 39 is provided on the thirteenth pipeline 38. Liquid level gauges and pressure transmitters are provided in each device to monitor the liquid level and pressure value. The fine filter adopts partitioned turbulent flow cleaning, and the filter element in the fine filter is divided into three modules. The filter elements of the three modules are in the same chamber, but the filter element outlet summary pipes of the three modules are independent of each other and are not connected to each other. The backwashing process adopts a pulse backwashing method to perform turbulent flow cleaning on each module in turn. The advantage of this structure is that when there are many filter elements installed in the equipment, the use of partitioned backwashing cleaning can greatly improve the backwashing efficiency and shorten the backwashing time.

[0036] The specific steps for filtering by the system are as follows: all valves are in the closed state before operation, the pneumatic regulating valve 16 is opened, and the first flow control valve 17 and the eighth flow control valve 29 are opened at the same time. When the liquid level in the coarse filter 2 is full, the air in the coarse filter 2 is emptied, the eighth flow control valve 29 is closed, and then the third flow control valve 20, the sixth flow control valve 25 and the tenth flow control valve 33 are opened. When the liquid level in the fine filter 3 is full, the air in the fine filter 3 is emptied, the tenth flow control valve 33 is closed, and the three seventh flow control valves 27 are opened at the same time, and the filtered liquid enters the filtered liquid pipeline for subsequent processing.

[0037] In one embodiment, Figure 1As shown, the air outlet of the nitrogen tank 4 is connected to the air inlet of the coarse filter 2 through a fourteenth pipeline 40, and a fourteenth flow control valve 41 is provided at one end of the fourteenth pipeline 40 close to the nitrogen tank 4, and a fifteenth flow control valve 42 is provided at one end of the fourteenth pipeline 40 close to the coarse filter 2, and the air inlet of the spare coarse filter 5 is connected to the fourteenth pipeline 40 through a fifteenth pipeline 43, and a sixteenth flow control valve 44 is provided on the fifteenth pipeline 43, and the fourteenth pipeline 40 is respectively connected to the three seventh pipelines 26 through three sixteenth pipelines 45, and a seventeenth flow control valve 46 is provided on the sixteenth pipeline 45, and the spare fine filter 9 is provided with three first liquid outlets, and they are respectively connected to the filtered liquid pipeline through three seventeenth pipelines 47, and the seventeenth pipeline 47 is provided with The eighteenth flow control valve 48, the fourteenth pipeline 40 is connected to the three seventeenth pipelines 47 through the eighteenth pipeline 49, the eighteenth pipeline 49 is provided with a nineteenth flow control valve 50, the second liquid outlet of the coarse filter 2 is connected to the liquid inlet of the coarse slag tank 6 through the nineteenth pipeline 51, the nineteenth pipeline 51 is provided with a twentieth flow control valve 52, the third liquid outlet of the coarse filter 2 is connected to the nineteenth pipeline 51 through the twentieth pipeline 53, the twentieth pipeline 53 is provided with a twenty-first flow control valve 54, the second liquid outlet of the spare coarse filter 5 is connected to the liquid inlet of the spare coarse slag tank 7 through the twenty-first pipeline 55, the twenty-second flow control valve 56 is provided on the twenty-first pipeline 55, the third liquid outlet of the spare coarse filter 5 is connected to the twenty-first pipeline 55 The second liquid outlet of the fine filter 3 is connected to the liquid inlet of the fine slag tank 8 through a twenty-third pipeline 59, and a twenty-fourth flow control valve 60 is provided on the twenty-third pipeline 59. The third liquid outlet of the fine filter 3 is connected to the twenty-third pipeline 59 through a twenty-fourth pipeline 61, and a twenty-fifth flow control valve 62 is provided on the twenty-fourth pipeline 61. The liquid outlet of the first gas-liquid separator 10 is connected to the twenty-third pipeline 59 through a twenty-fifth pipeline 63, and a twenty-sixth flow control valve 64 is provided on the twenty-fifth pipeline 63. The second liquid outlet of the standby fine filter 9 is connected to the twenty-third pipeline 59 through a twenty-sixth pipeline 65, and a twenty-sixth flow control valve 64 is provided on the twenty-sixth pipeline 65. There is a twenty-seventh flow control valve 66, the third liquid outlet of the spare fine filter 9 is connected to the twenty-third pipeline 59 through the twenty-seventh pipeline 67, and the twenty-eighth flow control valve 68 is arranged on the twenty-seventh pipeline 67. The liquid outlet of the second gas-liquid separator 11 is connected to the twenty-third pipeline 59 through the twenty-eighth pipeline 69, and the twenty-eighth pipeline 69 is provided with a twenty-ninth flow control valve 70. The gas outlet of the coarse slag tank 6 is connected to the eighth pipeline 28 through the twenty-ninth pipeline 71, and the first pressure valve 72 is arranged on the twenty-ninth pipeline 71. The gas outlet of the spare coarse slag tank 7 is connected to the eighth pipeline 28 through the thirtieth pipeline 73, and the second pressure valve 74 is arranged on the thirtieth pipeline 73. The gas outlet of the fine slag tank 8 is connected to the eighth pipeline 28 through the thirty-first pipeline 75.The 30th flow control valve 76 is provided on the 31st pipeline 75, the pressure air pipe is connected to the air inlet of the coarse slag tank 6 through the 32nd pipeline 77, the 32nd pipeline 77 is provided with a third pressure valve 78, the pressure air pipe is connected to the air inlet of the spare coarse slag tank 7 through the 33rd pipeline 79, the 33rd pipeline 79 is provided with a fourth pressure valve 80, the liquid outlet of the coarse slag tank 6 is connected to the reactor through the 34th pipeline 81, the 34th pipeline 81 is provided with a 31st flow control valve 82, the liquid outlet of the spare coarse slag tank 7 is connected to the reactor through the 35th pipeline 83, the 35th pipeline 83 is provided with a 32nd flow control valve 84, the first liquid outlet of the fine slag tank 8 is connected to the reactor through the 36th pipeline 85, the 36th pipeline 85 is provided with a 33rd flow control valve 86.

[0038] The specific operation steps of backwashing the coarse filter are as follows: open the second flow control valve 18 and the ninth flow control valve 31. When the liquid level of the spare coarse filter 5 is full, close the ninth flow control valve 31, then open the fifth flow control valve 24, activate the spare coarse filter 5, then close the first flow control valve 17 and the third flow control valve 20, the coarse filter 2 stops filtering liquid, open the twentieth flow control valve 52, and open the eighth flow control valve 29 and the first pressure valve 72 at the same time. After 5 minutes, close the eighth flow control valve 29 first to reduce the liquid level in the coarse filter 2 to below the second liquid outlet, and then open the fifteenth flow control valve 42. The coarse filter 2 is pulse backwashed, and the gas enters the liquid to clean the filter element through the disturbance of the airflow. The 20th flow control valve 52 is fully opened and then closed for 10 seconds, and then opened again after an interval of 30 seconds to allow the backwashed gas to enter the coarse slag tank 6. This is repeated 5 times in sequence to complete the backwashing of the coarse filter 2. The 21st flow control valve 54 and the eighth flow control valve 29 are opened to discharge the backwashing slag liquid in the coarse filter 2 into the coarse slag tank 6. After 8 minutes, the 20th flow control valve 52, the 21st flow control valve 54, the eighth flow control valve 29 and the first pressure valve 72 are closed. The backwashing of the coarse filter 2 is completed and it is put into standby mode.

[0039] Specific steps for hydraulic conveying of crude slag: slowly open the third pressure valve 78, adjust the opening of the third pressure valve 78, gradually increase the pressure of the crude slag tank 6, and the pressure increase rate is about 0.5MPa per minute. When the pressure transmitter in the crude slag tank 6 shows 4.3MPa, open the thirty-first flow control valve 82, and return the crude slag liquid containing a large amount of catalyst to the reactor for reuse. When the liquid level in the crude slag tank 6 is 0, first close the thirty-first flow control valve 82, then close the third pressure valve 78, and then slowly open the first pressure valve 72 to gradually reduce the pressure in the crude slag tank 6 at a pressure reduction rate of about 0.4MPa per minute. The pressure transmitter in the crude slag tank 6 shows ≤0.2Mpa, and close the first pressure valve 72.

[0040] The specific steps of backwashing the fine filter are as follows: first, put the spare fine filter 9 into use, and open the fourth flow control valve 21 and the twelfth flow control valve 37 at the same time. When the liquid level in the spare fine filter 9 is full, close the twelfth flow control valve 37, and then open the three eighteenth flow control valves 48. The spare fine filter 9 is activated. Then, close the sixth flow control valve 25, and after closing the three seventh flow control valves 27, open the twenty-fourth flow control valve 60, the tenth flow control valve 33 and the twenty-sixth flow control valve 64 at the same time. After 10 minutes, close 60 to discharge part of the liquid and gas in the fine filter 3, and then open the three seventh flow control valves 27 in sequence. The seventeenth flow control valves 46 perform pulse backwashing on the fine filter 3. Each seventeenth flow control valve 46 is fully opened for 10 seconds and then closed. After an interval of 30 seconds, the next seventeenth flow control valve 46 is opened, and this is repeated five times in sequence. The three seventeenth flow control valves 46 are closed to complete the backwashing of the fine filter 3. The twenty-fifth flow control valve 62 is opened to discharge the liquid in the fine filter 3 into the fine slag tank 8. After 10 minutes, the tenth flow control valve 33, the twenty-sixth flow control valve 64, the twenty-fifth flow control valve 62 and the thirtieth flow control valve 76 are closed. The backwashing of the fine filter 3 is completed and the fine filter 3 enters the standby state.

[0041] Fine slag liquid discharge step: After the fine filter 3 is backwashed, the twenty-eighth flow control valve 68 and the thirtieth flow control valve 76 are opened to discharge the slag liquid into the fine slag tank 8. Since the catalyst powder in the fine slag liquid is finer and the catalyst content is lower than that in the coarse slag liquid, the fine slag liquid naturally settles in the fine slag tank 8, causing the catalyst powder to settle to the bottom of the tank cone. After the fine filter 3 is backwashed several times, when the liquid level in the fine slag tank 8 reaches more than 80%, the delivery pump 12 is used to deliver the clear liquid after the upper part of the fine slag tank 8 is precipitated to the liquid inlet of the coarse filter 2 for secondary filtration. The catalyst powder at the bottom of the fine slag tank is analyzed for activity and its destination is determined. If the catalyst is active, it is discharged to the coarse slag tank 6 and then pressure-sent to the reactor for recycling through the coarse slag tank. If the catalyst is inactive, it is discharged to the centralized treatment pipeline for unified treatment.

[0042] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system, characterized in that: include: An oil-water separator (1), a coarse filter (2) and a fine filter (3); the liquid outlet of the oil-water separator (1) is connected to the liquid inlet of the coarse filter (2); the first liquid outlet of the coarse filter (2) is connected to the liquid inlet of the fine filter (3); the first liquid outlet of the fine filter (3) is connected to a filtered liquid pipeline; and the gas outlets of the coarse filter (2) and the fine filter (3) are both connected to a discharge main pipe.

2. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 1, characterized in that: The liquid inlet of the spare coarse filter (5) is connected to the liquid outlet of the oil-water separator (1), the first liquid outlet of the spare coarse filter (5) is connected to the liquid inlet of the fine filter (3), the second liquid outlet and the third liquid outlet of the coarse filter (2) are respectively connected to the liquid inlet of the coarse slag tank (6), the second liquid outlet and the third liquid outlet of the spare coarse filter (5) are respectively connected to the liquid inlet of the spare coarse slag tank (7), the air inlets of the coarse filter (2) and the spare coarse filter (5) are both connected to the air outlet of the nitrogen tank (4), the air outlets of the spare coarse filter (5), the coarse slag tank (6) and the spare coarse slag tank (7) are all connected to the discharge main pipe, and the discharge ports of the coarse slag tank (6) and the spare coarse slag tank (7) are connected to the reactor.

3. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 2, characterized in that: The second liquid outlet and the third liquid outlet of the fine filter (3) are both in communication with the liquid inlet of the fine slag tank (8), the first liquid outlet of the fine slag tank (8) is in communication with the reactor, the first liquid outlets of the coarse filter (2) and the spare coarse filter (5) are both in communication with the liquid inlet of the spare fine filter (9), the first liquid outlet of the spare fine filter (9) is in communication with the filtered liquid pipeline, the second liquid outlet and the third liquid outlet of the spare fine filter (9) are both in communication with the liquid inlet of the fine slag tank (8), the gas outlet of the nitrogen tank (4) is respectively in communication with the first liquid outlet of the fine filter (3), the first liquid outlet of the spare fine filter (9) and the gas inlet of the fine slag tank (8), the second liquid outlet and the third liquid outlet of the spare fine filter (9) are both in communication with the liquid inlet of the fine slag tank (8), and the gas outlets of the fine slag tank (8) and the spare fine filter (9) are both in communication with the discharge main pipe.

4. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 3, characterized in that: The air inlet of the first gas-liquid separator (10) is connected to the air outlet of the fine filter (3), the air outlet of the first gas-liquid separator (10) is connected to the discharge main pipe, and the liquid outlet of the first gas-liquid separator (10) is connected to the liquid inlet of the fine slag tank (8).

5. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 4, characterized in that: The air inlet of the second gas-liquid separator (11) is connected to the air outlet of the spare fine filter (9), the air outlet of the second gas-liquid separator (11) is connected to the discharge main pipe, and the liquid outlet of the second gas-liquid separator (11) is connected to the liquid inlet of the fine slag tank (8).

6. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 5, characterized in that: The second liquid outlet of the fine slag tank (8) is connected to the liquid inlet of the delivery pump (12), and the liquid outlet of the delivery pump (12) is respectively connected to the liquid inlets of the coarse filter (2) and the spare coarse filter (5).

7. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 6, characterized in that: The compressed air is communicated with the air inlets of the coarse slag tank (6) and the spare coarse slag tank (7) respectively.

8. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 7, characterized in that: The first liquid outlets of the coarse slag tank (6), the spare coarse slag tank (7) and the fine slag tank (8) are all connected to the centralized processing pipeline.

9. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 8, characterized in that: The liquid outlet of the oil-water separator (1) is connected to the liquid outlet of the delivery pump (12) through a first pipeline (13); the liquid inlet of the coarse filter (2) is connected to the first pipeline (13) through a second pipeline (14); the liquid inlet of the spare coarse filter (5) is connected to the first pipeline (13) through a third pipeline (15); a pneumatic regulating valve (16) is provided on the first pipeline (13); a first flow control valve (17) is provided on the second pipeline (14); a second flow control valve (18) is provided on the third pipeline (15); the first liquid outlet of the coarse filter (2) is connected to the liquid inlet of the spare fine filter (9) through a fourth pipeline (19); A third flow control valve (20) is provided at one end of the fourth pipeline (19) close to the coarse filter (2), a fourth flow control valve (21) is provided at one end of the fourth pipeline (19) close to the spare fine filter (9), a first liquid outlet of the spare coarse filter (5) is connected to the fourth pipeline (19) via a fifth pipeline (22), a liquid inlet of the fine filter (3) is connected to the fourth pipeline (19) via a sixth pipeline (23), a fifth flow control valve (24) is provided on the fifth pipeline (22), a sixth flow control valve (25) is provided on the sixth pipeline (23), and three liquid outlets of the fine filter (3) are provided. , and are respectively connected to the filtered liquid pipeline through three seventh pipelines (26), the seventh pipeline (26) is provided with a seventh flow control valve (27), the air outlet of the coarse filter (2) is connected to the exhaust main pipeline through an eighth pipeline (28), the eighth pipeline (28) is provided with an eighth flow control valve (29), the air outlet of the spare coarse filter (5) is connected to the eighth pipeline (28) through a ninth pipeline (30), the ninth pipeline (30) is provided with a ninth flow control valve (31), the air outlet of the fine filter (3) is connected to the air inlet of the first gas-liquid separator (10) through a tenth pipeline (32), the tenth pipeline (32) is provided with a ninth flow control valve (31), A tenth flow control valve (33) is provided, the gas outlet of the first gas-liquid separator (10) is connected to the eighth pipeline (28) through an eleventh pipeline (34), and the eleventh flow control valve (35) is provided on the eleventh pipeline (34), the gas outlet of the standby fine filter (9) is connected to the gas inlet of the second gas-liquid separator (11) through a twelfth pipeline (36), and the twelfth flow control valve (37) is provided on the twelfth pipeline (36), and the gas outlet of the second gas-liquid separator (11) is connected to the eighth pipeline (28) through a thirteenth pipeline (38), and the thirteenth flow control valve (39) is provided on the thirteenth pipeline (38).

10. A coal-to-liquid Fischer-Tropsch synthesis catalyst recovery system according to claim 9, characterized in that: The gas outlet of the nitrogen tank (4) is connected to the gas inlet of the coarse filter (2) through a fourteenth pipeline (40); a fourteenth flow control valve (41) is provided at one end of the fourteenth pipeline (40) close to the nitrogen tank (4); a fifteenth flow control valve (42) is provided at one end of the fourteenth pipeline (40) close to the coarse filter (2); the gas inlet of the spare coarse filter (5) is connected to the fourteenth pipeline (40) through a fifteenth pipeline (43); a sixteenth flow control valve (44) is provided on the fifteenth pipeline (43); the fourteenth pipeline (40) is connected to the three seventh pipelines (26) through three sixteenth pipelines (45); a seventeenth flow control valve (46) is provided on the sixteenth pipeline (45); the spare fine filter (9 ) The first liquid outlet is provided with three, and is respectively connected to the filtered liquid pipeline through three seventeenth pipelines (47), and the seventeenth pipeline (47) is provided with an eighteenth flow control valve (48), the fourteenth pipeline (40) is respectively connected to the three seventeenth pipelines (47) through an eighteenth pipeline (49), and the eighteenth pipeline (49) is provided with a nineteenth flow control valve (50), the second liquid outlet of the coarse filter (2) is connected to the liquid inlet of the coarse slag tank (6) through a nineteenth pipeline (51), and the nineteenth pipeline (51) is provided with a twentieth flow control valve (52), the third liquid outlet of the coarse filter (2) is connected to the nineteenth pipeline (51) through a twentieth pipeline (53), and the twentieth pipeline (53) is provided with a twenty-first flow control valve (52), The second liquid outlet of the spare coarse filter (5) is connected to the liquid inlet of the spare coarse slag tank (7) through a twenty-first pipeline (55), and a twenty-second flow control valve (56) is provided on the twenty-first pipeline (55). The third liquid outlet of the spare coarse filter (5) is connected to the twenty-first pipeline (55) through a twenty-second pipeline (57), and a twenty-third flow control valve (58) is provided on the twenty-second pipeline (57). The second liquid outlet of the fine filter (3) is connected to the liquid inlet of the fine slag tank (8) through a twenty-third pipeline (59), and a twenty-fourth flow control valve (60) is provided on the twenty-third pipeline (59). The third liquid outlet of the fine filter (3) is connected to the twenty-third pipeline (59) through the twenty-fourth pipeline (59). The second liquid outlet of the standby fine filter (9) is connected to the twenty-third pipeline (59) through the twenty-sixth pipeline (65), the twenty-seventh flow control valve (66) is provided on the twenty-sixth pipeline (65), the third liquid outlet of the standby fine filter (9) is connected to the twenty-third pipeline (59) through the twenty-seventh pipeline (67), and the twenty-eighth flow control valve (68) is provided on the twenty-seventh pipeline (67).The liquid outlet of the second gas-liquid separator (11) is connected to the twenty-third pipeline (59) through a twenty-eighth pipeline (69), and a twenty-ninth flow control valve (70) is provided on the twenty-eighth pipeline (69). The gas outlet of the coarse slag tank (6) is connected to the eighth pipeline (28) through a twenty-ninth pipeline (71), and a first pressure valve (72) is provided on the twenty-ninth pipeline (71). The gas outlet of the spare coarse slag tank (7) is connected to the eighth pipeline (28) through a thirtieth pipeline (73), and a second pressure valve (74) is provided on the thirtieth pipeline (73). The gas outlet of the fine slag tank (8) is connected to the eighth pipeline (28) through a thirty-first pipeline (75), and a thirtieth flow control valve (76) is provided on the thirty-first pipeline (75). The compressed air pipe is connected to the gas inlet of the coarse slag tank (6) through a third pipeline (74). The first and second pipes (77) are connected to the reactor, the first and second pipes (78) are connected to the reactor, the third and third pipes (79 ...

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