Liquid hydrocarbon filtering system and filtering method

Abstract

The invention discloses a liquid hydrocarbon filtering system and a filtering method.The liquid hydrocarbon filtering system comprises a filtering unit and a regeneration unit, at least one filtering assembly and at least one forward material pressing assembly are arranged in a filter of the filtering unit, and the regeneration unit is provided with a reverse blowing gas tank and a material pressing gas tank; the reverse blowing gas tank is communicated with the filtered oil outlet pipeline and the forward pressing oil outlet pipeline through a pipeline; and the pressing gas tank is communicated with an inlet at the top of the filter through a pipeline. The filtering mode, the forward pressing mode, the deslagging mode, the purging mode and the filtering mode of the next round are adopted, the forward pressing mode, the deslagging mode and the purging mode are alternately carried out for operation, and the yield of filtered oil is increased.

Description

Technical Field

[0001] The invention relates to the field of liquid hydrocarbon filtering, in particular to a liquid hydrocarbon filtering system and a filtering method. Background Art

[0002] Catalytic cracking is an important process technology for the production of gasoline and diesel from heavy oil. It is one of the most important and widely used technologies in the current oil refining field. However, catalytic cracking will produce slurry oil as a by-product. In particular, catalytic cracking currently uses hydrogenated residual oil or wax oil blended with residual oil as raw materials. The yield of slurry oil is relatively high, generally around 5%, and the highest yield can even reach 8%. Slurry oil is rich in polycyclic aromatic hydrocarbons, which can be used as raw materials for the production of marine fuel, carbon black, carbon fiber, etc. However, since the slurry oil contains about 1 to 6 g / L of catalytic cracking catalyst particles, it cannot meet the raw material index requirements for the production of marine fuel, carbon black, carbon fiber, etc., so its current utilization value is relatively low.

[0003] In order to improve the utilization value of oil slurry, solid particles in the oil slurry must be removed first. There are many ways to remove solid particles, such as sedimentation, flocculation, centrifugation and other methods, but these methods have too low removal efficiency. Filtration is a better way to remove solid particles in oil slurry. The filtration process is divided into blind-end filtration and cross-flow filtration according to the different fluids and separation directions. In the blind-end filtration process, a single filter is generally operated intermittently. After the filter pressure drop reaches a certain value or reaches a certain time, the oil slurry in the filter needs to be discharged and the filter material is regenerated so that the filtration area of ​​the filter material can be restored to the original amount. The amount of slag liquid discharged from the filter directly affects the yield of the desolidified product in the filtration process. Under the same feed amount in the same time, the larger the amount of slag liquid discharged, the lower the yield of the desolidified product. Generally, after the filter equipment is determined, the yield of the desolidified product is basically fixed.

[0004] CN111592908A discloses an oil slurry filtering system and an oil slurry filtering method, wherein at least one filter is arranged in a filtering unit, and the used filter is back-purged with a purge medium, the purge medium is an inert gas and / or flushing oil, and the flushing oil is the filtered oil. A pinhole-free filter bag made of a flexible filtering material is arranged in the filter.

[0005] CN111592909A discloses an oil slurry filtering system and an oil slurry filtering method, comprising a filtering unit and a filter aid buffer tank, wherein at least one filter is provided in the filtering unit, and an oil slurry inlet pipeline, a filtered oil outlet pipeline, and a filter residue discharge pipeline are respectively connected to each filter, the outlet of the filter aid buffer tank is connected to the oil slurry inlet of the filter, and a pinhole-free filter bag of a flexible filtering material is provided in the filter. In the oil slurry filtering method, the oil slurry enters the filter through the oil slurry inlet pipeline connected to the filter for filtering, and the filtered oil is extracted from the filtered oil outlet pipeline.

[0006] Existing technologies mostly focus on the effectiveness of filtration systems and the stability of filtration products. Summary of the invention

[0007] The technical problem to be solved by the present invention is the low oil yield after filtration in the prior art, and a liquid hydrocarbon filtration system and a filtration method are provided.

[0008] The first aspect of the present invention provides a liquid hydrocarbon filtering system, wherein a filter is provided in the filtering unit, wherein the filter has at least one filtering assembly and at least one forward pressing assembly, a liquid hydrocarbon inlet is provided at the lower part of the filter, a filtered oil outlet and a forward pressing oil outlet are provided at the upper part of the filter, a filter residue outlet is provided at the bottom of the filter, a pressing gas inlet is provided at the top of the filter, and a liquid hydrocarbon inlet pipeline, a filtered oil outlet pipeline, a forward pressing oil outlet pipeline, a filter residue discharge pipeline and a pressing gas inlet pipeline are respectively connected to each filter,

[0009] The filter assembly is provided with a central tube I, a support tube I, and a flexible filter material in sequence from the inside to the outside, the central tube I has no holes on its tube wall, the support tube I has holes evenly on its tube wall, the upper end and the lower end of the support tube I are respectively provided with a first tuning fork level gauge switch and a second tuning fork level gauge switch, the forward pressing assembly is provided with a central tube II, a support tube II, and a flexible filter material in sequence from the inside to the outside, the central tube II has no holes on its tube wall, the upper tube wall of the support tube II has no holes, and the lower tube wall thereof has holes evenly, and the upper end and the lower end of the non-hole portion of the support tube II are respectively provided with a third tuning fork level gauge switch and a fourth tuning fork level gauge switch;

[0010] The regeneration unit is provided with a back-blowing gas tank and a pressing gas tank, the back-blowing gas tank outlet pipeline is connected with the filtered oil outlet pipeline, and the back-blowing gas tank outlet pipeline is connected with the forward pressing oil outlet pipeline, and the pressing gas tank outlet pipeline is connected with the pressing gas inlet at the top of the filter.

[0011] In one embodiment of the present invention, in the filter assembly, the diameter ratio of the central tube I to the support tube I is in the range of 1:2 to 1:6, the distance between the bottom end of the central tube I and the bottom end of the support tube I is 0.2 m to 0.8 m, and the porosity on the wall of the support tube I is 55% to 85%.

[0012] In one embodiment of the present invention, in the forward pressing assembly, the diameter ratio of the center tube II to the support tube II is in the range of 1:2 to 1:6, the distance between the bottom end of the center tube II and the bottom end of the support tube II is 0.2m to 0.8m, and the porosity of the opening portion on the tube wall of the support tube II is 55% to 85%; the height of the opening portion of the tube wall of the support tube II is 1 / 2 to 1 / 3 of the total height of the support tube II.

[0013] In one embodiment of the present invention, the first tuning fork liquid level gauge switch and the third tuning fork liquid level gauge switch are at the same horizontal position.

[0014] In one embodiment of the present invention, the flexible filter material is fixed to the outer surface of the support tube 1 by upper and lower heads.

[0015] In one embodiment of the present invention, the flexible filter material is fixed to the outer surface of the support tube II by upper and lower heads.

[0016] In one embodiment of the present invention, the flexible filter material is selected from one or more of polyethylene, nylon, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid, polyurethane, and glass fiber.

[0017] In one embodiment of the present invention, the flexible filter material is a composite of any two or more selected from polyethylene, nylon, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid, polyurethane, and glass fiber.

[0018] In one embodiment of the present invention, the filtration accuracy of the flexible filter material is 0.1 to 15 microns, preferably 0.1 to 10 microns, more preferably 0.2 to 5 microns. The gram weight of the flexible filter material is 300 to 1000 g / m 2 , preferably 520~660g / m 2 The warp breaking strength is 850N / 5cm~9000N / 5cm, and the weft breaking strength is 1000N / 5cm~11000N / 5cm; the thickness of the flexible filter material is 0.5~3.4mm, preferably 0.5~3.0mm, and more preferably 1.8~2.9mm.

[0019] In one embodiment of the present invention, the flexible filter material in the filter of the present invention can be a single layer (single) or a multi-layer (more than two). When it is a multi-layer form, the multi-layer flexible filter material is stacked, and at this time, there is no restriction on the number of stacked layers and the arrangement of the layers.

[0020] In one embodiment of the present invention, the flexible filter material includes a desolidification layer and a base fabric layer, the porosity of the desolidification layer is 25% to 98%, the porosity of the base fabric layer is 30% to 40%, the base fabric layer is made of polytetrafluoroethylene and / or polyphenylene sulfide, and the desolidification layer is made of polytetrafluoroethylene.

[0021] The base fabric layer is obtained by weaving the raw materials that can be made into flexible filter materials using weaving technology known in the art. There is no limitation on the weaving technology, including but not limited to hydroentanglement, thermal weaving, wet weaving, spunbonding, meltblowing, needle punching, stitching, hot rolling, etc. The desolidification layer is formed on the base fabric layer by methods known in the art such as hot pressing, laminating, hot rolling, etc., using the raw materials that can be made into flexible filter materials. The desolidification layer and the base fabric layer of the present invention can be prepared independently and successively, or they can be prepared in an integrated manner. The flexible filter material of the present invention, which at least includes a desolidification layer and a base fabric layer, can be prepared by methods known in the art, or commercial products can be used.

[0022] In one embodiment of the present invention, the flexible filter material includes at least a desolidification layer and a base fabric layer, but is not limited thereto and may be modified and derived therefrom. For example, based on the desolidification layer and the base fabric layer of the present invention, other layers may be further included without adversely affecting the effects of the present invention.

[0023] In one embodiment of the present invention, the backwash gas in the backwash gas tank is nitrogen and / or fuel gas.

[0024] In one embodiment of the present invention, the pressurized gas in the pressurized gas tank is nitrogen and / or fuel gas.

[0025] In one embodiment of the present invention, the liquid hydrocarbon is catalytic cracking slurry oil and / or coal tar.

[0026] The inventor of the present invention has found through extensive research that when the filter pressure drop or filtration time reaches a certain value, the oil slurry level in the filter is higher than the filter assembly. If the slag discharge regeneration mode is directly adopted, this part of the oil slurry in the filter will be lost. Although the filter material (flexible filter material) still has a certain flux, the filter cake applied on the flexible filter material is uneven. By passing gas at the top of the filter to press the material forward, only the oil slurry above the top of the filter material can be recovered.

[0027] Therefore, the present invention sets a forward pressing component, and by introducing a certain pressure of pressing gas from the top of the filter, the liquid hydrocarbons above the top of the opening of the pressing component are pressed out through the forward pressing component, and this part of the forward pressing oil is mixed with the filtered oil. In the present invention, the forward pressing oil refers to: the liquid hydrocarbons in the filter pressed out by the pressing gas in the forward pressing mode.

[0028] The second aspect of the present invention provides a liquid hydrocarbon filtering method using the above-mentioned filtering system, comprising: filtering mode: the liquid hydrocarbon inlet and the filtered oil outlet of the filter are in an open state, and the other inlets and outlets of the filter are in a closed state, after the liquid hydrocarbon enters the filter from the liquid hydrocarbon inlet pipeline, the liquid hydrocarbon flows from the bottom to the top of the central tube I of the filtering assembly, and the filtered oil is discharged from the top of the central tube I, and the filtered oil is extracted from the filtered oil outlet of the filter;

[0029] Forward pressure mode: the pressure gas inlet of the filter and the forward pressure oil outlet of the filter are in the open state, and the other inlets and outlets of the filter are in the closed state. The pressure gas enters the forward pressure component of the filter from the pressure gas inlet, and the liquid hydrocarbons stored in the filter are pressed out from the forward pressure oil outlet of the filter and mixed with the filtered oil;

[0030] Slag discharge mode: The filter slag outlet is open, and the other inlets and outlets of the filter are closed, so that the residual liquid hydrocarbons in the filter are discharged;

[0031] Purge mode: The filter residue outlet is open, and the back-blowing gas enters the filter from the filter oil outlet pipeline and the forward pressure oil outlet pipeline for purge. The back-blowing gas flows from the top of the center tube I of the filter component from top to bottom to be discharged from the bottom, and then purges the inner surface of its flexible filter material. The back-blowing gas flows from the top of the center tube II of the forward pressure component from top to bottom to be discharged, and then purges the inner surface of its flexible filter material.

[0032] In one embodiment of the present invention, the liquid hydrocarbon is catalytic cracking slurry oil and / or coal tar.

[0033] In one embodiment of the present invention, in the filtration mode, the filtration temperature in the filter is 30 to 250°C, preferably 60 to 180°C;

[0034] In one embodiment of the present invention, in the filtration mode, the pressure difference during use of the filter is 0.01-0.5 MPa.

[0035] In one embodiment of the present invention, in the filtering mode, the filter sets the filtering time to 24 hours to 96 hours.

[0036] In one embodiment of the present invention, in the filtering mode, when the pressure difference of the filter reaches or exceeds the pressure difference setting value, or reaches the setting time, the filter is converted to the forward pressing mode operation; the filtering mode ends and the forward pressing mode begins, at which time the liquid hydrocarbon level stored in the filter is higher than the first tuning fork level gauge switch, and in the forward pressing mode, when the liquid hydrocarbon level stored in the filter is lower than the fourth tuning fork level gauge switch, the forward pressing mode is stopped and converted to the slag discharge mode. This operation not only avoids the situation that if the liquid hydrocarbon level is lower than the top of the filter assembly, the pressing gas will directly enter the rear filtered oil pipeline, affecting the operation of the filtering system, but also improves the yield of filtered oil.

[0037] The forward pressing mode provided in the present invention, on the one hand, reduces the amount of liquid hydrocarbons discharged to the filter residue outlet during regeneration, thereby increasing the oil yield after filtration. On the other hand, this part of the forward pressing oil is filtered oil and does not need to be circulated to the liquid hydrocarbon raw material tank for repeated filtration, thereby saving filtration costs.

[0038] In one embodiment of the present invention, when a filter is set in the filtration unit, the operation is performed in an alternating manner of filtration mode, forward pressure mode, slag discharge mode, purge mode and the next round of filtration mode, forward pressure mode, slag discharge mode, purge mode.

[0039] In the present invention, one filter or more than two filters may be provided in the filter unit. When multiple filters are provided, the present invention does not limit any connection mode. Multiple filters may be provided in parallel or in series, or in parallel and in series, or in parallel and in series at the same time. When multiple filters are provided, multiple filters with the same filtering accuracy may be used, or multiple filters with inconsistent filtering accuracy may be used.

[0040] In one embodiment of the present invention, when a plurality of filters are arranged in the filtration unit, when the pressure difference of a certain online filter reaches or exceeds the pressure difference setting value or reaches the set time, the filter is cut out of the filtration system and regenerated in the forward pressing mode, slag discharge mode and purge mode.

[0041] Compared with the prior art, the liquid hydrocarbon filtering system and filtering method provided by the present invention can significantly improve the oil slurry yield after filtering and save filtering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of one embodiment of the liquid hydrocarbon filtration system provided by the present invention.

[0043] Figure 2 It is a schematic diagram of another embodiment of the liquid hydrocarbon filtration system provided by the present invention.

[0044] Figure 3 It is a schematic diagram of the material flow direction in the filtering mode of the filtering component in the liquid hydrocarbon filtering method provided by the present invention.

[0045] Figure 4 It is a schematic diagram of the material flow direction in the purge mode of the filter component in the liquid hydrocarbon filtering method provided by the present invention.

[0046] Figure 5 It is a schematic diagram of the material flow direction in the forward pressing mode of the forward pressing component in the liquid hydrocarbon filtering method provided by the present invention. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited thereby.

[0048] Figure 1 FIG. 1 is a schematic diagram of one embodiment of the liquid hydrocarbon filtration system provided by the present invention. Figure 1 As shown, the liquid hydrocarbon filtering system provided by the present invention includes a filtering unit and a regeneration unit, wherein a filter 1 is arranged in the filtering unit, a filtering assembly 2 and a forward pressing assembly 3 are arranged in the filter 1, a liquid hydrocarbon inlet is arranged at the lower part of the filter 1, a filtered oil outlet and a forward pressing oil outlet are arranged at the upper part of the filter 1, a filter residue outlet is arranged at the bottom of the filter 1, a pressing gas inlet is arranged at the top of the filter 1, and a liquid hydrocarbon inlet pipeline 4, a filtered oil outlet pipeline 5, a forward pressing oil outlet pipeline 14, a filter residue discharge pipeline 6 and a pressing gas inlet pipeline 8 connected to the filter 1 are arranged. The filter assembly 2 is provided with a central tube I, a support tube I, and a flexible filter material in sequence from the inside to the outside. The central tube I has no holes on its wall, and the support tube I has holes evenly on its wall. The upper and lower ends of the support tube I are respectively provided with a first tuning fork level gauge switch 9 and a second tuning fork level gauge switch 10; the forward pressing assembly 3 is provided with a central tube II, a support tube II, and a flexible filter material in sequence from the inside to the outside. The central tube II has no holes on its wall, and the upper tube wall of the support tube II has no holes, and its lower tube wall has holes evenly. The upper and lower ends of the non-hole portion of the support tube II are respectively provided with a third tuning fork level gauge switch 15 and a fourth tuning fork level gauge switch 16, wherein the horizontal positions of the first tuning fork level gauge switch 9 and the third tuning fork level gauge switch 15 are consistent. The regeneration unit is provided with a back-blowing gas tank 11 and a pressing gas tank 7, the outlet pipeline 12 of the back-blowing gas tank 11 is connected with the filtered oil outlet pipeline 5, and the outlet pipeline 13 of the back-blowing gas tank is connected with the forward pressing oil outlet pipeline 14, and the outlet pipeline 8 of the pressing gas tank is connected with the pressing gas inlet at the top of the filter 1.

[0049] Figure 2 FIG. 1 is a schematic diagram of one embodiment of the liquid hydrocarbon filtration system provided by the present invention. Figure 2As shown, the liquid hydrocarbon filtering system provided by the present invention includes a filtering unit and a regeneration unit, wherein a filter 1 and a filter 4 are arranged in the filtering unit, a liquid hydrocarbon inlet is arranged at the lower part of the filter 1 and the filter 4, a filtered oil outlet and a forward pressure oil outlet are arranged at the upper part of the filter 1 and the filter 4, a pressure gas inlet is arranged at the top of the filter 1 and the filter 4, a filter residue outlet is arranged at the bottom of the filter 1 and the filter 4, and a liquid hydrocarbon inlet pipeline 7, a filtered oil outlet pipeline 9, a filter residue discharge pipeline 29, a pressure gas pipeline 19 and a forward pressure oil outlet pipeline 11 are connected to the filter 1, and a liquid hydrocarbon inlet pipeline 8, a filtered oil outlet pipeline 10, a filter residue discharge pipeline 30, a pressure gas pipeline 20 and a forward pressure oil outlet pipeline 12 are connected to the filter 4.

[0050] A filter assembly 2 and a forward pressing assembly 3 are provided in the filter 1, and a filter assembly 5 and a forward pressing assembly 6 are provided in the filter 4. The filter assembly 2 and the filter assembly 5 are provided with a central tube 1, a support tube 1, and a flexible filter material in sequence from the inside to the outside, and a first tuning fork level gauge switch 21 and a second tuning fork level gauge switch 22 are provided at the upper end and the lower end of the support tube 1 of the filter assembly 2, respectively, and a first tuning fork level gauge switch 25 and a second tuning fork level gauge switch 26 are provided at the upper end and the lower end of the support tube 1 of the filter assembly 5, respectively. The forward pressing assembly 3 and the forward pressing assembly 6 are both provided with a central tube II, a support tube II, and a flexible filter material from the inside to the outside in sequence. The tube wall of the central tube II is not perforated, the upper tube wall of the support tube II is not perforated, and the lower tube wall thereof is evenly perforated. The third tuning fork level gauge switch 23 and the fourth tuning fork level gauge switch 24 are respectively provided at the upper and lower ends of the non-perforated portion of the support tube II of the forward pressing assembly 3, and the third tuning fork level gauge switch 27 and the fourth tuning fork level gauge switch 28 are respectively provided at the upper and lower ends of the non-perforated portion of the support tube II of the forward pressing assembly 6. Among them, the horizontal positions of the first tuning fork level gauge switch 21 and the third tuning fork level gauge switch 23 are consistent, and the horizontal positions of the first tuning fork level gauge switch 25 and the third tuning fork level gauge switch 27 are consistent.

[0051] The regeneration unit is provided with a pressurizing gas tank 14 and a back-blowing gas tank 13. The outlet of the pressurizing gas tank 14 is connected to the pressurizing gas inlet at the top of the filter 1 via a pressurizing gas inlet pipeline 19, and the outlet of the pressurizing gas tank 14 is connected to the pressurizing gas inlet at the top of the filter 4 via a pressurizing gas inlet pipeline 20. The outlet of the back-blowing gas tank 13 is connected to the filtered oil outlet pipeline 9 of the filter 1 via a pipeline 15, and the outlet of the back-blowing gas tank 13 is connected to the positive pressurizing oil outlet pipeline 11 of the filter 1 via a pipeline 16; the back-blowing gas tank 13 is connected to the filtered oil outlet pipeline 10 of the filter 4 via a pipeline 17, and the outlet of the back-blowing gas tank 13 is connected to the positive pressurizing oil outlet pipeline 12 of the filter 4 via a pipeline 18.

[0052] Use Figure 2When the filtration system shown is filtering, filter 1 and filter 4 can be used in parallel or switched. When switched, filter 1 is filtering online while filter 4 is regenerating or in standby mode; or filter 4 is filtering online while filter 1 is regenerating or in standby mode.

[0053] Figure 3 Schematic diagram of the material flow direction of the filter assembly in the liquid hydrocarbon filtering method provided by the present invention in the filtering mode. Figure 3 As shown, the filter assembly includes a central tube I 22 and a support tube I 21 covered by a flexible filter material; in the filtering mode, after the liquid hydrocarbons enter the filter from the liquid hydrocarbon inlet pipeline, the liquid hydrocarbons outside the filter assembly enter the support tube I 21 covered by the flexible filter material in the filter assembly from the directions shown by the logistics 23 and the logistics 24, and the filtered oil then flows from the bottom of the central tube I 22 from bottom to top, and the filtered oil 25 is discharged from the top of the central tube I, and the filtered oil is extracted from the filtered oil outlet of the filter.

[0054] Figure 4 Schematic diagram of the material flow direction in the purge mode of the filter assembly in the liquid hydrocarbon filtration method provided by the present invention. Figure 4 As shown, the filter assembly includes a central tube I 22 and a support tube I 21 covered with a flexible filter material; in the purge mode, the back-blowing gas enters the filter from the oil outlet pipeline after the filter for purge, and the back-blowing gas 26 enters from the top of the central tube I 22 of the filter assembly, flows from top to bottom to be discharged from the bottom, and then purges to the inner surface of the flexible filter material covered on the outside of the support tube I, and the filter cake on the outer surface of the flexible filter material is blown off along the direction of logistics 27 and logistics 28.

[0055] Figure 5 Schematic diagram of the material flow direction of the forward pressing component in the forward pressing mode of the liquid hydrocarbon filtering method provided by the present invention. Figure 5 As shown, the forward pressing component includes a central tube II 30 and a support tube II 29 covered by a flexible filter material; in the forward pressing mode, the pressing gas enters the filter from the pressing gas inlet, and the liquid hydrocarbons stored in the filter are pressed into the support tube II 29 covered by a flexible filter material in the forward pressing component from the directions shown by the logistics 31 and the logistics 32, and the forward pressing oil then flows from the bottom of the central tube II 30 to the top, and the forward pressing oil 33 is discharged from the top of the central tube II 30.

[0056] The present invention will be further described below in conjunction with embodiments, but the present invention is not limited thereto.

[0057] The properties of the liquid hydrocarbon feedstock used in the examples are listed in Table 1.

[0058] Table 1

[0059] Oil Slurry A Oil slurry B Coal tar <![CDATA[Density (g / cm 3 )]]> 1.0756 1.0876 1.08 <![CDATA[Viscosity at 100 °C (mm 2 / s)]]> 21.88 20.0 2.3 Ash content (μg / g) 4360 1640 2650

[0060] Example 1

[0061] This embodiment adopts Figure 1 The filtration system shown in the figure has a single filter arranged in the filtration unit, a filtration assembly and a forward pressing assembly arranged in the filter, the filtration assembly is sequentially arranged from the inside to the outside with a central tube I, a support tube II, and a flexible filter material, the tube wall of the central tube I has no holes, the tube wall of the support tube I has uniform holes, the diameter ratio of the central tube I to the support tube I is 1:3, the distance between the end bottom of the central tube I and the end bottom of the support tube I is 0.3m, the opening rate of the tube wall of the support tube I is 60%, the forward pressing assembly is sequentially arranged from the inside to the outside with a central tube II, a support tube II, and a flexible filter material, the tube wall of the central tube II has no holes, the upper tube wall of the support tube II has no holes, and the lower tube wall thereof has uniform holes, the height of the lower opening part of the support tube II of the forward pressing assembly is 1 / 2 of the total height of the support tube II, and the other dimensions of the forward pressing assembly are the same as those of the filtration assembly. The flexible filter material used in the filtration assembly and the forward pressing assembly is provided with a desolidification layer and a base cloth layer, and the specific property parameters are shown in Table 2.

[0062] Table 2

[0063]

[0064] Filtration test was carried out using slurry oil A:

[0065] Filtration mode: feed flow rate 1kg / h, filtration temperature 140℃, and the pressure difference for starting the filter positive pressure mode is set to 0.30MPa. At the beginning of the filtration mode, the liquid hydrocarbon inlet of the filter is opened to fill the filter 1. The volume of liquid hydrocarbon above the first tuning fork level gauge switch 9 (third tuning fork level gauge 15) in the filter is 1.5L, the volume of liquid hydrocarbon between the first tuning fork level gauge switch 9 and the second tuning fork level gauge switch 10 is 4L, the volume of liquid hydrocarbon between the third tuning fork level gauge switch 15 and the fourth tuning fork level gauge switch 16 is 2L, and the volume of liquid hydrocarbon below the second tuning fork level gauge switch 10 is 1.5L. In the filtration mode, except for the liquid hydrocarbon inlet pipeline 4 and the filtered oil outlet pipeline 5 connected to the filter 1, the other pipelines are closed. After the filter 1 runs for 60h, the pressure drop reaches 0.30MPa, and the positive pressure mode is started.

[0066] Forward pressure mode: the liquid hydrocarbon inlet pipeline 4 and the filtered oil outlet pipeline 5 are closed, the filter's pressure gas inlet pipeline 8 and the forward pressure oil outlet pipeline 14 are unblocked, and the filter's other inlets and outlets are closed. The pressure gas (nitrogen) enters the filter from the pressure gas inlet pipeline 8, and the liquid hydrocarbons stored in the filter are pressed out from the positive pressure oil outlet. During the forward pressure mode, the oil slurry A in the filter pressed out by the pressure gas is the forward pressure oil.

[0067] Slag discharge mode: When the filter liquid level drops to the fourth tuning fork level gauge 16 indicating closed, close the pressure gas inlet pipeline 8 and the forward pressure oil outlet pipeline 14. Start the slag discharge mode, the filter residue discharge pipeline 6 is unblocked, and the remaining liquid in the filter is discharged. After the remaining liquid is emptied, start the purge mode.

[0068] Purge mode: purge nitrogen is introduced from the back-blowing gas tank 11 and pipelines 12 and 13 for back-blowing. The back-blowing gas enters the filter from the filter oil outlet pipeline and the forward pressure oil pipeline for purge, and the purged material is discharged from the filter residue discharge pipeline 6.

[0069] After the purge mode is finished, the next round of filtration mode is started. Filter 1 undergoes 7 rounds of filtration mode, forward pressure mode, slag discharge mode and purge mode. The filtration time, ash content after filtration and oil yield after filtration of each round of filtration are listed in Table 3.

[0070] Among them, in each round of filtration, the oil yield after filtration = (feed flow rate*time+forward pressure oil volume*oil slurry A density) / (feed flow rate*time+oil slurry A volume in filter 1 during filtration*oil slurry density)*100%.

[0071] Table 3

[0072]

[0073] Example 2

[0074] This embodiment adopts Figure 1The filtration system shown in the figure has a single filter in its filtration unit, a filtration assembly and a forward pressing assembly in the filter, the filtration assembly is provided with a central tube I, a support tube II, and a flexible filter material from the inside to the outside, the central tube I has no holes on its wall, the support tube I has uniform holes on its wall, the diameter ratio of the central tube I to the support tube I is 1:5, the distance between the end bottom of the central tube I and the end bottom of the support tube I is 0.5m, the opening rate of the support tube I wall is 80%, the forward pressing assembly is provided with a central tube II, a support tube II, and a flexible filter material from the inside to the outside, the central tube II has no holes on its wall, the upper tube wall of the support tube II has no holes, and the lower tube wall thereof has uniform holes, the height of the lower opening part of the support tube II of the forward pressing assembly is 1 / 3 of the total height of the support tube II, and the other dimensions of the forward pressing assembly are the same as those of the filtration assembly. 。 The flexible filter material used in the filter assembly and the forward pressure assembly is provided with a desolidification layer and a base fabric layer, and the specific property parameters are shown in Table 4.

[0075] Table 4

[0076]

[0077] Filtration test was carried out using slurry oil B:

[0078] Filtration mode: feed flow rate 1.5kg / h, filtration temperature 120℃, and the pressure difference of the filter starting positive pressure mode is set to 0.40MPa. At the beginning of the filtration mode, the liquid hydrocarbon inlet of the filter is opened to fill the filter 1. The volume of liquid hydrocarbon above the first tuning fork level gauge switch 9 (third tuning fork level gauge 15) in the filter is 1.5L, the volume of liquid hydrocarbon between the first tuning fork level gauge switch 9 and the second tuning fork level gauge switch 10 is 4L, the volume of liquid hydrocarbon between the third tuning fork level gauge switch 15 and the fourth tuning fork level gauge switch 16 is 2.67L, and the volume of liquid hydrocarbon below the second tuning fork level gauge switch 10 is 1.5L. In the filtration mode, except for the liquid hydrocarbon inlet pipeline 4 and the filtered oil outlet pipeline 5 connected to the filter 1, the other pipelines are closed. After the filter 1 runs for 70h, the pressure drop reaches 0.40MPa, and the positive pressure mode is started.

[0079] Forward pressure mode: the liquid hydrocarbon inlet pipeline 4 and the filtered oil outlet pipeline 5 are closed, the filter's pressure gas inlet pipeline 8 and the forward pressure oil outlet pipeline 14 are unblocked, and the filter's other inlets and outlets are closed. The pressure gas (nitrogen) enters the filter from the pressure gas inlet pipeline 8, and the liquid hydrocarbons stored in the filter are pressed out from the positive pressure oil outlet. During the forward pressure mode, the oil slurry B in the filter pressed out by the pressure gas is the forward pressure oil.

[0080] Slag discharge mode: When the filter liquid level drops to the fourth tuning fork level gauge 16 indicating closed, close the pressure gas inlet pipeline 8 and the forward pressure oil outlet pipeline 14. Start the slag discharge mode, the filter residue discharge pipeline 6 is unblocked, and the remaining liquid in the filter is discharged. After the remaining liquid is emptied, start the purge mode.

[0081] Purge mode: purge nitrogen is introduced from the back-blowing gas tank 11 and pipelines 12 and 13 for back-blowing. The back-blowing gas enters the filter from the filter oil outlet pipeline and the forward pressure oil pipeline for purge, and the purged material is discharged from the filter residue discharge pipeline 6.

[0082] After the purge mode is finished, the next round of filtration mode is started. Filter 1 undergoes 8 rounds of filtration mode, forward pressure mode, slag discharge mode and purge mode. The filtration time, ash content after filtration and oil yield after filtration of each round of filtration are listed in Table 5.

[0083] Among them, in each round of filtration, the oil yield after filtration = (feed flow rate*time+forward pressure oil volume*oil slurry B density) / (feed flow rate*time+oil slurry B volume in filter 1 during filtration*oil slurry density)*100%.

[0084] Table 5

[0085]

[0086]

[0087] Comparative Example 1

[0088] The same filtration system as in Example 1 was used to carry out the filtration test using oil slurry A. The filtration mode was exactly the same as that in Example 1, except that there was no forward pressing mode, and the filtration mode was directly switched to the slag discharge mode and the purge mode.

[0089] Filtration mode: feed flow rate 1kg / h, filtration temperature 140℃, and the pressure difference of the filter to start the slag discharge mode is set to 0.30MPa. At the beginning of the filtration mode, the liquid hydrocarbon inlet of the filter is opened to fill the filter 1. The volume of liquid hydrocarbon above the first tuning fork level gauge switch 9 (third tuning fork level gauge 15) in the filter is 1.5L, the volume of liquid hydrocarbon between the first tuning fork level gauge switch 9 and the second tuning fork level gauge switch 10 is 4L, and the volume of liquid hydrocarbon below the second tuning fork level gauge switch 10 is 1.5L. In the filtration mode, except for the liquid hydrocarbon inlet pipeline 4 and the filtered oil outlet pipeline 5 connected to the filter 1, the other pipelines are closed. After the filter 1 runs for 60.1h, the pressure drop reaches 0.30MPa, and the slag discharge mode is started.

[0090] Slag discharge mode: close the liquid hydrocarbon inlet pipeline 4 and the filtered oil outlet pipeline 5, open the filter residue discharge pipeline 6 of the filter, discharge the remaining liquid in the filter, and start the purge mode after the remaining liquid is emptied.

[0091] Purge mode: purge nitrogen is introduced from the back-blowing gas tank 11 and pipeline 12 for back-blowing. The back-blowing gas enters the filter from the oil outlet pipeline after filtration for purge, and the purged material is discharged from the filter residue discharge pipeline 6.

[0092] After the purge mode is finished, the next round of filtration mode is started. Filter 1 undergoes 7 rounds of filtration mode, slag discharge mode and purge mode. The filtration time, ash content after filtration and oil yield after filtration of each round of filtration are listed in Table 6.

[0093] Among them, in each round of filtration, the oil yield after filtration = (feed flow rate*time) / (feed flow rate*time+volume of oil slurry A in filter 1 in filtration mode*oil slurry density)*100%.

[0094] Table 6

[0095]

[0096] Comparative Example 2

[0097] The same filtration system as in Example 2 was used to carry out the filtration test using oil slurry B. The filtration mode was exactly the same as that in Example 2, except that there was no forward pressing mode, and the filtration mode was directly switched to the slag discharge mode and the purge mode.

[0098] Filtration mode: feed flow rate 1.5kg / h, filtration temperature 120℃, and the pressure difference of the filter to start the slag discharge mode is set to 0.40MPa. At the beginning of the filtration mode, the liquid hydrocarbon inlet of the filter is opened to fill the filter 1. The volume of liquid hydrocarbon above the first tuning fork level gauge switch 9 (third tuning fork level gauge 15) in the filter is 1.5L, the volume of liquid hydrocarbon between the first tuning fork level gauge switch 9 and the second tuning fork level gauge switch 10 is 4L, and the volume of liquid hydrocarbon below the second tuning fork level gauge switch 10 is 1.5L. In the filtration mode, except for the liquid hydrocarbon inlet pipeline 4 and the filtered oil outlet pipeline 5 connected to the filter 1, the other pipelines are closed. After the filter 1 runs for 68.8h, the pressure drop reaches 0.40MPa, and the slag discharge mode is started.

[0099] Slag discharge mode: close the liquid hydrocarbon inlet pipeline 4 and the filtered oil outlet pipeline 5, open the filter residue discharge pipeline 6 of the filter, discharge the remaining liquid in the filter, and start the purge mode after the remaining liquid is emptied.

[0100] Purge mode: purge nitrogen is introduced from the back-blowing gas tank 11 and pipeline 12 for back-blowing. The back-blowing gas enters the filter from the oil outlet pipeline after filtration for purge, and the purged material is discharged from the filter residue discharge pipeline 6.

[0101] After the purge mode is finished, the next round of filtration mode is started. Filter 1 undergoes 8 rounds of filtration mode, slag discharge mode and purge mode. The filtration time, ash content after filtration and oil yield after filtration of each round of filtration are listed in Table 7.

[0102] Among them, in each round of filtration, the oil yield after filtration = (feed flow rate*time) / (feed flow rate*time+volume of oil slurry B in filter 1 in filtration mode*oil slurry density)*100%.

[0103] Table 7

[0104]

[0105] Example 3

[0106] use Figure 2 The oil slurry filtration system shown in the figure has filter 1 and filter 4 in the filtration unit, and each filter is provided with a filter assembly and a forward pressing assembly of the same size, and the specific size is the same as that of the filter assembly and the forward pressing assembly of Example 1. The flexible filter material of this embodiment is provided with a desolidification layer and a base fabric layer, and the specific property parameters are shown in Table 8.

[0107] Table 8

[0108]

[0109]

[0110] The filtration test was carried out using coal tar. Two filters 1 and 4 were operated in parallel. Filter 1 was put into use first. After filter 1 was operated in the filtration mode for 24 hours, filter 4 was put into use. At this time, both filter 1 and filter 4 were in the filtration mode. Each filter performed each round of filtration in sequence: filtration mode, forward pressure mode, slag discharge mode and purge mode, and the filtration mode time of each filter was set to 45 hours.

[0111] Filter mode of filter 1: feed flow rate 2.0kg / h, filtration temperature 150°C. The time for filter 1 to start the forward pressure mode is set to 45h. At the beginning of the filtration mode, the liquid hydrocarbon inlet of the filter is opened, and the filter 1 is filled with coal tar. The volume of coal tar above the first tuning fork level gauge switch 21 (third tuning fork level gauge switch 23) in the filter is 1.5L, the volume of coal tar between the first tuning fork level gauge switch 21 and the second tuning fork level gauge switch 22 is 4L, the volume of coal tar between the third tuning fork level gauge switch 23 and the fourth tuning fork level gauge switch 24 is 2.0L, and the volume of coal tar below the second tuning fork level gauge switch 22 is 1.5L. Coal tar enters filter 1 through the liquid hydrocarbon inlet pipeline 7 connected to filter 1 for filtration, and the obtained filtered oil is discharged through the filtered oil outlet pipeline 9. After filter 1 has been running for 45h, the forward pressure mode is started.

[0112] Forward pressure mode of filter 1: liquid hydrocarbon inlet pipeline 7 and filtered oil outlet pipeline 9 are closed, the pressure gas inlet pipeline 19 of filter 1 and the forward pressure oil outlet pipeline 11 of filter 1 are unblocked, other inlets and outlets of filter 1 are closed, and pressure gas (nitrogen) enters filter 1 from pressure gas inlet pipeline 19, and the coal tar stored in filter 1 is pressed out from the positive pressure oil outlet of filter 1. During the forward pressure mode, the coal tar in filter 1 pressed out by the pressure gas is the forward pressure oil.

[0113] Slag discharge mode of filter 1: When the liquid level of filter 1 drops to the level indicator 24 of the fourth tuning fork, the pressure gas inlet pipeline 19 and the forward pressure oil outlet pipeline 11 are closed, and the slag discharge mode is started. The filter residue discharge pipeline 29 of filter 1 is unblocked, and the remaining liquid in filter 1 is discharged.

[0114] Purge mode of filter 1: After the remaining liquid is drained, purge nitrogen is introduced from the back-blowing gas tank 13 and pipelines 15 and 16 for back-blowing. The back-blowing gas enters the filter 1 from the rear oil outlet pipeline and the forward pressure oil outlet pipeline for purge, and the material obtained by purge is discharged from the filter residue discharge pipeline 29.

[0115] After the purge mode is finished, the next round of filtration mode is started. Filter 1 undergoes two rounds of filtration mode, forward pressure mode, slag discharge mode and purge mode. The filtration time, ash content after filtration and oil yield after filtration of each round of filtration are listed in Table 9.

[0116] Among them, in each round of filtration, the oil yield after filtration = (feed flow rate*time+forward pressure oil volume*coal tar density) / (feed flow rate*time+coal tar volume in filter 1 in filtration mode*coal tar density)*100%.

[0117] Filter mode of filter 4: feed flow rate 2.0kg / h, filtration temperature 150°C. The time for filter 4 to start the forward pressure mode is set to 45h. At the beginning of the filtration mode, the liquid hydrocarbon inlet of filter 4 is opened, and filter 4 is filled with coal tar. The volume of coal tar above the first tuning fork level gauge switch 25 (third tuning fork level gauge switch 27) in the filter is 1.5L, the volume of coal tar between the first tuning fork level gauge switch 25 and the second tuning fork level gauge switch 26 is 4L, the volume of coal tar between the third tuning fork level gauge switch 27 and the fourth tuning fork level gauge switch 28 is 2.0L, and the volume of coal tar below the second tuning fork level gauge switch 26 is 1.5L. Coal tar enters filter 4 through the liquid hydrocarbon inlet pipeline 8 connected to filter 4 for filtration, and the filtered oil is discharged through the filtered oil outlet pipeline 10. After filter 4 has been running for 45h, the forward pressure mode is started.

[0118] Forward pressure mode of filter 4: liquid hydrocarbon inlet pipeline 8 and filtered oil outlet pipeline 10 are closed, pressure gas inlet pipeline 20 of filter 4 and forward pressure oil outlet pipeline 12 of filter 4 are unblocked, other inlets and outlets of filter 4 are closed, pressure gas (nitrogen) enters filter 4 from pressure gas inlet pipeline 20, and coal tar stored in filter 4 is pressed out from the positive pressure oil outlet of filter 4. During the forward pressure mode, the coal tar in filter 4 pressed out by pressure gas is forward pressure oil.

[0119] Slag discharge mode of filter 4: When the liquid level of filter 4 drops to the fourth tuning fork level gauge 28 indicating closed, close the pressure gas inlet pipeline 20 and the forward pressure oil outlet pipeline 12, and start the slag discharge mode. The filter residue discharge pipeline 30 of filter 4 is unblocked, and the remaining liquid in filter 4 is discharged.

[0120] Purge mode of filter 4: after the remaining liquid is drained, purge nitrogen is introduced from the back-blowing gas tank 13 and pipelines 17 and 18 for back-blowing, and the back-blowing gas enters the filter 4 from the filtered oil outlet pipeline and the forward pressure oil outlet pipeline for purge, and the material obtained by purge is discharged from the filter residue discharge pipeline 30.

[0121] After the purge mode is finished, the next round of filtration mode is started. Filter 4 undergoes two rounds of filtration mode, forward pressure mode, slag discharge mode and purge mode. The filtration time, ash content after filtration and oil yield after filtration of each round of filtration are listed in Table 9.

[0122] Among them, in each round of filtration, the oil yield after filtration = (feed flow rate*time+forward pressure oil volume*coal tar density) / (feed flow rate*time+coal tar volume in filter 1 in filtration mode*coal tar density)*100%.

[0123] Table 9

[0124]

[0125] It can be seen from the above results of the present invention that the liquid hydrocarbon filtration system and filtration method provided by the present invention can significantly improve the yield of the filtered product.

Claims

1. A liquid hydrocarbon filtration system, comprising a filtration unit and a regeneration unit, wherein a filter is arranged in the filtration unit, wherein the filter has at least one filtration assembly and at least one forward pressing assembly, a liquid hydrocarbon inlet is arranged at the lower part of the filter, a filtered oil outlet and a forward pressing oil outlet are arranged at the upper part of the filter, a filter residue outlet is arranged at the bottom of the filter, a pressing gas inlet is arranged at the top of the filter, and a liquid hydrocarbon inlet pipeline, a filtered oil outlet pipeline, a forward pressing oil outlet pipeline, a filter residue discharge pipeline and a pressing gas inlet pipeline are respectively connected to each filter, The filter assembly is provided with a central tube I, a support tube I, and a flexible filter material in sequence from the inside to the outside, the central tube I has no holes on its tube wall, the support tube I has holes evenly on its tube wall, the upper end and the lower end of the support tube I are respectively provided with a first tuning fork level gauge switch and a second tuning fork level gauge switch, the forward pressing assembly is provided with a central tube II, a support tube II, and a flexible filter material in sequence from the inside to the outside, the central tube II has no holes on its tube wall, the upper tube wall of the support tube II has no holes, and the lower tube wall thereof has holes evenly, and the upper end and the lower end of the non-hole portion of the support tube II are respectively provided with a third tuning fork level gauge switch and a fourth tuning fork level gauge switch; The regeneration unit is provided with a back-blowing gas tank and a pressing gas tank, the back-blowing gas tank outlet pipeline is connected with the filtered oil outlet pipeline, and the back-blowing gas tank outlet pipeline is connected with the forward pressing oil outlet pipeline, and the pressing gas tank outlet pipeline is connected with the pressing gas inlet at the top of the filter.

2. The system according to claim 1, characterized in that The diameter ratio of the central tube I to the support tube I is in the range of 1:2 to 1:6, the distance between the bottom of the central tube I and the bottom of the support tube I is 0.2m to 0.8m, and the opening rate on the wall of the support tube I is 55% to 85%.

3. The system according to claim 1, characterized in that The diameter ratio of the central tube II to the support tube II is in the range of 1:2 to 1:6, the distance between the bottom end of the central tube II and the bottom end of the support tube II is 0.2m to 0.8m, and the opening rate of the opening part on the tube wall of the support tube II is 55% to 85%; the height of the opening part of the tube wall of the support tube II is 1 / 2 to 1 / 3 of the total height of the support tube II.

4. The system according to claim 1, characterized in that The horizontal positions of the first tuning fork liquid level gauge switch and the third tuning fork liquid level gauge switch are consistent.

5. The system according to any one of claims 1 to 3, characterized in that: The flexible filter material is selected from one or more of polyethylene, nylon, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid, polyurethane, and glass fiber, or the flexible filter material is a flexible filter material composited from any two or more of polyethylene, nylon, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid, polyurethane, and glass fiber.

6. The system according to claim 1, characterized in that The filtration accuracy of the flexible filter material is 0.1 to 15 microns, and the weight of the flexible filter material is 300 to 1000 g / m 2 The warp breaking strength is 850N / 5cm~9000N / 5cm, the weft breaking strength is 1000N / 5cm~11000N / 5cm, and the thickness is 0.5~3.4mm.

7. The system according to claim 1, characterized in that The flexible filter material comprises a desolidification layer and a base fabric layer, wherein the porosity of the desolidification layer is 25% to 98%, the porosity of the base fabric layer is 30% to 40%, the base fabric layer is made of polytetrafluoroethylene and / or polyphenylene sulfide, and the desolidification layer is made of polytetrafluoroethylene.

8. The system according to claim 1, characterized in that The back-blowing gas in the back-blowing gas tank is nitrogen and / or fuel gas; the pressing gas in the pressing gas tank is nitrogen and / or fuel gas.

9. A method for filtering liquid hydrocarbons using the filtering system according to any one of claims 1 to 8, comprising: Filtering mode: the liquid hydrocarbon inlet and the filtered oil outlet of the filter are in an open state, and the other inlets and outlets of the filter are in a closed state. After the liquid hydrocarbon enters the filter from the liquid hydrocarbon inlet pipeline, the liquid hydrocarbon flows from the bottom to the top of the central tube I of the filter assembly, and the filtered oil is discharged from the top of the central tube I. The filtered oil is extracted from the filtered oil outlet of the filter together; Forward pressure mode: the pressure gas inlet of the filter and the forward pressure oil outlet of the filter are in the open state, and the other inlets and outlets of the filter are in the closed state. The pressure gas enters the forward pressure component of the filter from the pressure gas inlet, and the liquid hydrocarbons stored in the filter are pressed out from the forward pressure oil outlet of the filter and mixed with the filtered oil; Slag discharge mode: The filter slag outlet is open, and the other inlets and outlets of the filter are closed, so that the residual liquid hydrocarbons in the filter are discharged; Purge mode: The filter residue outlet is open, and the back-blowing gas enters the filter from the filter oil outlet pipeline and the forward pressure oil outlet pipeline for purge. The back-blowing gas flows from the top of the center tube I of the filter component from top to bottom to be discharged from the bottom, and then purges the inner surface of its flexible filter material. The back-blowing gas flows from the top of the center tube II of the forward pressure component from top to bottom to be discharged, and then purges the inner surface of its flexible filter material.

10. The method according to claim 9, characterized in that In the filtering mode, the filtering temperature in the filter is 30 to 250°C, preferably 60 to 180°C; The pressure difference during filter use is 0.01~0.5MPa.

11. The method according to claim 9, characterized in that In the filtering mode, the filter sets the filtering time to 24h~96h.

12. The method according to claim 9, characterized in that In the filtration mode, when the pressure difference of the filter reaches or exceeds the pressure difference setting value, or when the setting time is reached, the filter is converted to the forward pressure mode operation; The filtration mode ends and the forward pressing mode begins. At this time, the oil slurry level stored in the filter is higher than the first tuning fork level gauge switch. In the forward pressing mode, when the oil slurry level stored in the filter is lower than the fourth tuning fork level gauge switch, the forward pressing mode is stopped and switched to the slag discharge mode.

13. The method according to claim 9, characterized in that When a filter is set in the filtration unit, the operation is performed in a manner of alternating the filtration mode, the forward pressure mode, the slag discharge mode, the purge mode and the next round of filtration mode, the forward pressure mode, the slag discharge mode and the purge mode.

14. The method according to claim 9, characterized in that When the filtration unit is provided with multiple filters, when the differential pressure of a certain online filter reaches or exceeds the differential pressure setting value or reaches the set time, the filter is cut out of the filtration system and regenerated in the forward pressing mode, slag discharge mode and purge mode.

15. The system according to claim 9, characterized in that The liquid hydrocarbon is catalytic cracking slurry oil and / or coal tar.

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