Filtering system suitable for petrochemical engineering device and online cleaning method

Abstract

The invention provides a filtering system suitable for a petrochemical engineering device and an on-line cleaning method, and belongs to the technical field of filtering, the filtering system comprises at least one filter, the filter comprises a vertical filter cartridge, a filter cavity, a water inlet pipe and a water outlet pipe, a bracket, a first pipe orifice, a second pipe orifice, a third pipe orifice, a fourth pipe orifice, a fifth pipe orifice and a sixth pipe orifice are arranged on the cavity wall of the filtering cavity; the raw material feeding channel is communicated with the first pipe orifice; the purified material discharging channel, the raw material discharging channel and the first nitrogen channel are communicated with the second pipe orifice; the residual raw material discharge channel and the waste recovery channel are communicated with the third pipe orifice; the overflow channel is communicated with the fourth pipe orifice; the second nitrogen channel is communicated with the fifth pipe orifice; and the clear water channel is communicated with the sixth pipe orifice. According to the invention, the accumulation of residual catalysts is avoided, the problem of spontaneous combustion risk of the catalysts in the follow-up filter maintenance process is solved, the cleaning effect is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of filtration, and relates to a filtration system, in particular to a filtration system and an online cleaning method suitable for petrochemical equipment. Background Art

[0002] In the petrochemical industry, filters are one of the key equipment used to remove solid particles, impurities and other contaminants from process fluids to protect downstream equipment from wear and blockage, ensure the smooth operation of the production process, and improve product quality.

[0003] The current filtration process liquid consists of 37-38 wt% ethanol, 7-8 wt% water, 53-55 wt% hexamethylenediamine, 0.3 wt% sodium hydroxide, and 0.03 wt% Raney nickel catalyst. The Raney nickel catalyst has a density of 1530 kg / m³ and a particle size of 5-200 μm. Because dry Raney nickel catalyst is prone to spontaneous combustion when exposed to air, it must be stored in a water-sealed environment.

[0004] After the filter has been used for a long time, a large amount of Raney nickel catalyst is attached to the filter structure of the filter. In order to ensure the use effect of the filter, the filter needs to be cleaned.

[0005] However, the existing filter is a horizontal filter, and the slag discharge port of the filter is located in the middle of the bottom, making it easier for residual waste liquid catalyst to be cleaned thoroughly at the bottom of the filter, requiring the cover to be opened for inspection and flushing. However, Raney nickel catalyst is prone to spontaneous combustion when exposed to air. If the dry catalyst is exposed to air, it may cause a fire or even an explosion, posing a serious danger to the safety of personnel and equipment. Summary of the Invention

[0006] The purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose a filtration system that can clean the filter in an oxygen-free environment, improve the cleaning effect, and realize continuous filtration production.

[0007] The object of the present invention can be achieved by the following technical solutions: A filtration system suitable for a petrochemical plant includes at least one filter, the filter comprising:

[0008] A vertical filter cartridge having a conical bottom and a filter cavity provided inside the vertical filter cartridge, and a side support for mounting a filter cloth provided on the cavity wall of the filter cavity, wherein the vertical filter cartridge is provided with a first pipe port, a second pipe port, a third pipe port, a fourth pipe port, a fifth pipe port, and a sixth pipe port connected to the filter cavity;

[0009] A raw material feeding channel is connected to the first pipe opening, and a first program-controlled valve is provided on the raw material feeding channel to automatically connect or disconnect with the first pipe opening;

[0010] The purified material discharge channel, the raw material discharge channel, and the first nitrogen channel are all connected to the second pipe port, and a second program-controlled valve, a third program-controlled valve, and a fourth program-controlled valve are respectively provided on the purified material discharge channel, the raw material discharge channel, and the first nitrogen channel to automatically connect or disconnect with the second pipe port;

[0011] The residual raw material discharge channel and the waste material recovery channel are both connected to the third pipe port, and a fifth program-controlled valve and a sixth program-controlled valve are respectively provided on the residual raw material discharge channel and the waste material recovery channel to realize automatic connection or disconnection with the third pipe port;

[0012] an overflow channel, connected to the fourth pipe port, and provided with a seventh program-controlled valve on the overflow channel for automatically connecting or disconnecting with the fourth pipe port;

[0013] a second nitrogen channel, connected to the fifth pipe port, and provided with an eighth program-controlled valve on the second nitrogen channel for automatically connecting or disconnecting the second nitrogen channel from the fifth pipe port;

[0014] The clean water channel is connected to the sixth pipe port, and a ninth program-controlled valve is provided on the clean water channel for automatically connecting to or cutting off the sixth pipe port.

[0015] In the above-mentioned filtration system suitable for petrochemical equipment, the first and third pipe openings are arranged at the bottom of the vertical filter cartridge, the second pipe opening is arranged on the side wall of the vertical filter cartridge and close to one end of the bottom of the vertical filter cartridge, the fourth pipe opening is arranged on the side wall of the vertical filter cartridge and close to one end of the top of the vertical filter cartridge, the fifth and sixth pipe openings are arranged at the top of the vertical filter cartridge, and the second and fourth pipe openings are located on both sides of the vertical filter cartridge.

[0016] In the above-mentioned filtration system applicable to petrochemical equipment, a bottom support is provided on the bottom of the filter cavity, and a connection port connected to the filter cloth and connected to the first nitrogen channel is provided on the bottom support, wherein the filter cloth is provided in a plate-frame shape.

[0017] In the above-mentioned filtration system suitable for petrochemical equipment, multiple side supports are arranged on the wall of the filter chamber, and the multiple side supports are distributed in a ring shape along the axial direction of the vertical filter cartridge, wherein the two sides of the filter cloth are correspondingly plugged into the two side supports on the same horizontal line, and multiple connecting ports are provided on the bottom support member, each connecting port is connected to the filter cloth bag port at the corresponding position.

[0018] In the above-mentioned filtration system suitable for petrochemical equipment, a first manual valve is further provided on the raw material feed channel, a second manual valve is further provided on the purified material discharge channel, a third manual valve is further provided on the first nitrogen channel, a fourth manual valve is further provided on the second nitrogen channel, and a fifth manual valve is further provided on the clean water channel, wherein the manual valves are arranged side by side with the program-controlled valves on the corresponding channels.

[0019] In the above-mentioned filtration system suitable for petrochemical equipment, a first pressure monitoring point and a second pressure monitoring point are respectively set on both sides of the filter cloth along the flow direction of the filtrate. When the pressure difference between the first pressure monitoring point and the second pressure monitoring point is greater than a preset value, it is determined that the current filter cloth needs to be cleaned.

[0020] In the above-mentioned filtration system suitable for petrochemical equipment, there are multiple filters, and the multiple filters are arranged in parallel, wherein the raw material feed channel, the purified material discharge channel, the raw material discharge channel, the first nitrogen channel, the residual raw material discharge channel, the waste recovery channel, the overflow channel, the second nitrogen channel and the clean water channel are shared by the multiple filters.

[0021] The present invention also provides an online cleaning method using the filtration system, comprising the steps of:

[0022] S1: Cut off the raw material feeding channel and the purified material discharging channel;

[0023] S2: The nitrogen in the second nitrogen channel is used to pressurize the remaining raw materials in the filter cavity into the residual raw material discharge channel;

[0024] S3: The nitrogen in the first nitrogen channel cooperates with the water flow in the clean water channel to flush the catalyst particles on the surface of the filter cloth and send them into the waste recovery channel;

[0025] S4: Filling the filter cavity with clean water in the clean water channel so that the filter cloth is immersed in the clean water, and cooperating with the nitrogen in the first nitrogen channel to further peel off the catalyst from the surface of the filter cloth;

[0026] S5: The wastewater in step S4 is discharged into the wastewater recovery channel through the nitrogen in the first nitrogen channel, completing the first cleaning of the filter cloth;

[0027] S6: Repeat steps S3 to S5 until the preset cleaning time is reached, and the filter cloth is cleaned.

[0028] In the above-mentioned online cleaning method, in step S1, the first program-controlled valve and the second program-controlled valve are closed by the control system, the raw material feed channel and the first pipe opening are cut off, and the channel between the material discharge channel and the second pipe opening is purified;

[0029] In step S2, the fifth and eighth program-controlled valves are opened by the control system to connect the residual raw material discharge channel with the third pipe port and the channel between the second nitrogen channel and the fifth pipe port, and the residual raw liquid in the filter cavity is sent into the residual raw material discharge channel by nitrogen. When the preset time is reached, the fifth and eighth program-controlled valves are closed by the control system to cut off the channel between the residual raw material discharge channel and the third pipe port and the channel between the second nitrogen channel and the fifth pipe port, thereby completing the residual raw material return operation;

[0030] In step S3, the control system sequentially opens the sixth program-controlled valve, the fourth program-controlled valve, and the ninth program-controlled valve to connect the waste recovery channel with the third pipe port, the first nitrogen channel with the second pipe port, and the channel between the clean water channel and the sixth pipe port. Nitrogen is introduced from the bag port of the filter cloth through the first nitrogen channel, and the filter cloth is effectively shaken under the flushing action of the external water flow. When a preset time is reached, the control system closes the sixth program-controlled valve to cut off the channel between the waste recovery channel and the third pipe port.

[0031] In step S4, the seventh programmable valve is opened by the control system to connect the channel between the overflow channel and the fourth pipe port. When the preset water injection time is reached, the ninth programmable valve is closed by the control system to cut off the channel between the clean water channel and the sixth pipe port. Then, after a preset time delay, the fourth programmable valve and the seventh programmable valve are closed by the control system to cut off the channels between the first nitrogen channel and the second pipe port, and between the overflow channel and the fourth pipe port.

[0032] In step S5, the sixth and eighth program-controlled valves are opened by the control system to connect the waste recovery channel with the third pipe port, and the channel between the second nitrogen channel and the fifth pipe port. The wastewater in step S4 is pressed into the waste recovery channel by the nitrogen in the second nitrogen channel. When the preset time is reached, the eighth and sixth program-controlled valves are closed in sequence, cutting off the channel between the second nitrogen channel and the fifth pipe port, and the channel between the waste recovery channel and the third pipe port, thereby completing the primary cleaning of the filter cloth.

[0033] In the above-mentioned online cleaning method, when the filter is put into production again after cleaning, the following steps are also included:

[0034] S7: Opening the first program-controlled valve and the third program-controlled valve through the control system to connect the raw material feed channel and the first pipe port, and the raw material discharge channel and the channel between the second pipe port;

[0035] S8: Open the second program-controlled valve through the control system to connect the channel between the purified material discharge channel and the second pipe outlet, and then close the third program-controlled valve to cut off the channel between the raw material discharge channel and the second pipe outlet. At this time, the sound and light alarm prompts, indicating that the current filter is already in working condition.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The present invention provides a filtration system suitable for petrochemical equipment, in which the bottom of the vertical filter cartridge is configured to have a conical structure, thereby avoiding the accumulation of residual catalyst and solving the problem of the risk of catalyst spontaneous combustion during the subsequent filter maintenance process. In addition, the automated cleaning not only improves the cleaning effect and reduces labor intensity, but also realizes continuous production and improves production efficiency.

[0038] (2) By setting up multiple filters, when one of the filters is performing a self-cleaning operation, the remaining filters can still perform normal filtering processing, thereby ensuring the continuity of production and improving work efficiency.

[0039] (3) The filter cloth is impacted in the form of a pulse, which can make the filter cloth shake, and with the cooperation of the external water flow impact, the catalyst on the surface of the filter cloth is further peeled off. In addition, when the filter cloth is immersed in water, nitrogen will flow into the water from the inside to the outside of the filter cloth, which will generate bubbles. The impact generated when the bubbles burst can hit the surface of the filter cloth again, thereby further peeling off the catalyst from the surface of the filter cloth.

[0040] (4) Step S7 is set to attach a catalyst filter cake layer to the surface of the filter cloth to assist in filtering catalyst particles with smaller particle sizes. When the raw material flowing out of the raw material discharge channel is clear, the channel between the raw material discharge channel and the second pipe opening is cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The present invention is a flow chart of a filtration system suitable for a petrochemical plant.

[0042] In the figure,

[0043] 10. Vertical filter cartridge; 11. Filter chamber; 111. First pressure monitoring point; 112. Second pressure monitoring point; 12. Side support; 13. First pipe opening; 14. Second pipe opening; 15. Third pipe opening; 16. Fourth pipe opening; 17. Fifth pipe opening; 18. Sixth pipe opening; 19. Bottom support; 191. Connecting port;

[0044] 20. Raw material feeding channel; 21. First program-controlled valve; 22. First manual valve;

[0045] 30. Purified material discharge channel; 31. Second program-controlled valve; 32. Second manual valve;

[0046] 40. Raw material discharge channel; 41. Third program-controlled valve;

[0047] 50. First nitrogen channel; 51. Fourth program-controlled valve; 52. Third manual valve; 53. First one-way valve;

[0048] 60. Residual raw material discharge channel; 61. Fifth program-controlled valve;

[0049] 70. Waste recovery channel; 71. Sixth program-controlled valve;

[0050] 80. Overflow channel; 81. Seventh program-controlled valve;

[0051] 90. Second nitrogen channel; 91. Eighth program-controlled valve; 92. Fourth manual valve; 93. Second one-way valve;

[0052] 100, clean water channel; 110, ninth program-controlled valve; 120, fifth manual valve; 130, third one-way valve;

[0053] 200. Filter cloth. DETAILED DESCRIPTION

[0054] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0055] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0056] like Figure 1 As shown, the present invention provides a filtration system suitable for a petrochemical plant, comprising at least one filter, the filter comprising:

[0057] The vertical filter cartridge 10 has a conical bottom and a filter cavity 11 is provided inside the vertical filter cartridge 10. A side support 12 for mounting a filter cloth 200 is provided on the wall of the filter cavity 11. The vertical filter cartridge 10 is provided with a first pipe opening 13, a second pipe opening 14, a third pipe opening 15, a fourth pipe opening 16, a fifth pipe opening 17, and a sixth pipe opening 18 that are connected to the filter cavity 11. The first pipe opening 13 and the third pipe opening 15 are provided at the bottom of the vertical filter cartridge 10, the second pipe opening 14 is provided on the side wall of the vertical filter cartridge 10 and is close to one end of the bottom of the vertical filter cartridge 10, the fourth pipe opening 16 is provided on the side wall of the vertical filter cartridge 10 and is close to one end of the top of the vertical filter cartridge 10, the fifth pipe opening 17 and the sixth pipe opening 18 are provided at the top of the vertical filter cartridge 10, and the second pipe opening 14 and the fourth pipe opening 16 are located on both sides of the vertical filter cartridge 10.

[0058] The raw material feeding channel 20 is connected to the first pipe opening 13, and a first program-controlled valve 21 is provided on the raw material feeding channel 20 to automatically connect or disconnect with the first pipe opening 13;

[0059] The purified material discharge channel 30, the raw material discharge channel 40, and the first nitrogen channel 50 are all connected to the second pipe port 14, and the purified material discharge channel 30, the raw material discharge channel 40, and the first nitrogen channel 50 are respectively provided with a second program-controlled valve 31, a third program-controlled valve 41, and a fourth program-controlled valve 51 for automatically connecting or disconnecting with the second pipe port 14;

[0060] The residual raw material discharge channel 60 and the waste material recovery channel 70 are both connected to the third pipe port 15, and are respectively provided with a fifth program-controlled valve 61 and a sixth program-controlled valve 71 for automatically connecting or disconnecting with the third pipe port 15;

[0061] The overflow channel 80 is connected to the fourth pipe port 16, and a seventh program-controlled valve 81 is provided on the overflow channel 80 to automatically connect or disconnect with the fourth pipe port 16;

[0062] The second nitrogen channel 90 is connected to the fifth pipe port 17, and an eighth program-controlled valve 91 is provided on the second nitrogen channel 90 to automatically connect or disconnect with the fifth pipe port 17;

[0063] The clean water channel 100 is connected to the sixth pipe port 18 , and a ninth program-controlled valve 110 is provided on the clean water channel 100 for automatically connecting to or disconnecting from the sixth pipe port 18 .

[0064] The present invention provides a filtration system suitable for petrochemical equipment, in which the bottom of the vertical filter cartridge 10 is configured to have a conical structure, thereby avoiding the accumulation of residual catalyst and solving the problem of the risk of catalyst spontaneous combustion during the subsequent filter maintenance process. In addition, automated cleaning not only improves the cleaning effect and reduces labor intensity, but also realizes continuous production and improves production efficiency.

[0065] Preferably, a bottom support member 19 is provided on the bottom of the filter cavity 11 , and a connection port 191 connected to the filter cloth 200 and in communication with the first nitrogen channel 50 is provided on the bottom support member 19 , wherein the filter cloth 200 is provided in a plate-frame shape.

[0066] It is worth mentioning that when the filter cloth 200 needs to be cleaned, nitrogen is blown into the filter cloth 200 through the first nitrogen channel 50 via the connection port 191, causing the filter cloth 200 to swell. Preferably, when nitrogen is passed into the first nitrogen channel 50, pulse blowing is adopted to achieve shaking of the filter cloth 200, thereby shaking off the catalyst attached to the surface of the filter cloth 200 from the filter cloth 200, thereby improving the cleaning effect of the filter cloth 200.

[0067] It is further pointed out that a plurality of side supports 12 are provided on the wall of the filter cavity 11, and the plurality of side supports 12 are distributed in a ring shape along the axial direction of the vertical filter cartridge 10, wherein the two sides of the filter cloth 200 are correspondingly plugged into and fitted with the two side supports 12 on the same horizontal line, and a plurality of connection ports 191 are provided on the bottom support 19, and each connection port 191 is connected to the bag opening of the filter cloth 200 at the corresponding position.

[0068] In this embodiment, by disposing a plurality of filter cloths 200 in the filter cavity 11 , the filtering effect can be further improved.

[0069] Preferably, a first manual valve 22 is further provided on the raw material feed channel 20, a second manual valve 32 is further provided on the purified material discharge channel 30, a third manual valve 52 is further provided on the first nitrogen channel 50, a fourth manual valve 92 is further provided on the second nitrogen channel 90, and a fifth manual valve 120 is further provided on the clean water channel 100, wherein the manual valves are arranged side by side with the program-controlled valves on the corresponding channels.

[0070] In this embodiment, a manual valve is provided on the channel to serve as a backup valve, thereby improving the reliability of the entire filtration system.

[0071] More preferably, one-way valves are further provided on the first nitrogen channel 50 , the second nitrogen channel 90 and the clean water channel 100 , which are a first one-way valve 53 , a second one-way valve 93 and a third one-way valve 130 , respectively.

[0072] Preferably, along the flow direction of the filtrate, a first pressure monitoring point 111 and a second pressure monitoring point 112 are respectively provided on both sides of the filter cloth 200, wherein when the pressure difference between the first pressure monitoring point 111 and the second pressure monitoring point 112 is greater than a preset value, it is determined that the current filter cloth 200 needs to be cleaned.

[0073] It is worth mentioning that the preset value is generally 0.3 MPa, that is, when the pressure difference between the first pressure monitoring point 111 and the second pressure monitoring point 112 exceeds 0.3 MPa, the filtration system will start the self-cleaning program of the filter cloth 200 to remove the Raney nickel catalyst attached to the surface of the filter cloth 200.

[0074] Preferably, there are multiple filters, and the multiple filters are arranged in parallel, wherein the raw material feed channel 20, the purified material discharge channel 30, the raw material discharge channel 40, the first nitrogen channel 50, the residual raw material discharge channel 60, the waste recovery channel 70, the overflow channel 80, the second nitrogen channel 90 and the clean water channel 100 are used by multiple filters together.

[0075] In this embodiment, by providing multiple filters, when one of the filters is performing a self-cleaning operation, the remaining filters can still perform filtering processing normally, thereby ensuring the continuity of production and further improving work efficiency.

[0076] The present invention also provides an online cleaning method using the filtration system, comprising the steps of:

[0077] S1: When the control system detects that the pressure difference between the first monitoring point and the second monitoring point is greater than the preset pressure difference, the control system closes the first program-controlled valve 21 and the second program-controlled valve 31, thereby cutting off the raw material feed channel 20 and the first pipe port 13 and the channel between the purified material discharge channel 30 and the second pipe port 14;

[0078] S2: The control system opens the fifth programmable valve 61 and the eighth programmable valve 91 to connect the residual raw material discharge channel 60 with the third pipe port 15, and the channel between the second nitrogen channel 90 and the fifth pipe port 17. The residual raw liquid in the filter chamber 11 is sent into the residual raw material discharge channel 60 through nitrogen. When the preset time is reached, the control system closes the fifth programmable valve 61 and the eighth programmable valve 91 to cut off the channel between the residual raw material discharge channel 60 and the third pipe port 15, and the channel between the second nitrogen channel 90 and the fifth pipe port 17. At this time, the residual raw material withdrawal operation is completed;

[0079] S3: The control system sequentially opens the sixth programmable valve 71, the fourth programmable valve 51, and the ninth programmable valve 110, connecting the waste recovery channel 70 with the third pipe port 15, the first nitrogen channel 50 with the second pipe port 14, and the channels between the clean water channel 100 and the sixth pipe port 18. Nitrogen enters the bag opening of the filter cloth 200 through the first nitrogen channel 50 and is discharged from the inside to the outside into the filter cavity 11. Under the flushing action of the external water flow, the filter cloth 200 is effectively shaken. When a preset time is reached, the control system closes the sixth programmable valve 71, cutting off the channel between the waste recovery channel 70 and the third pipe port 15.

[0080] S4: The seventh programmable valve 81 is opened by the control system to connect the channel between the overflow channel 80 and the fourth pipe port 16. When the preset water injection time is reached, the ninth programmable valve 110 is closed by the control system to cut off the channel between the clean water channel 100 and the sixth pipe port 18. Then, after a preset time delay, the fourth programmable valve 51 and the seventh programmable valve 81 are closed by the control system to cut off the channels between the first nitrogen channel 50 and the second pipe port 14, and between the overflow channel 80 and the fourth pipe port 16.

[0081] S5: The sixth programmable valve 71 and the eighth programmable valve 91 are opened through the control system to connect the waste recovery channel 70 with the third pipe port 15, and the channel between the second nitrogen channel 90 and the fifth pipe port 17. The wastewater in step S4 is pressed into the waste recovery channel 70 by the nitrogen in the second nitrogen channel 90. When the preset time is reached, the eighth programmable valve 91 and the sixth programmable valve 71 are closed in sequence, cutting off the channel between the second nitrogen channel 90 and the fifth pipe port 17, and the channel between the waste recovery channel 70 and the third pipe port 15, thereby completing the primary cleaning of the filter cloth 200.

[0082] S6: The control system repeats steps S3 to S5 to circulate and clean the filter cloth 200. When the preset cleaning time is reached, the cleaning of the filter cloth 200 is stopped. The filter cloth 200 is now prepared for next use.

[0083] It is further noted that step S1 is used to cut off the raw material feed channel 20 and the purified material discharge channel 30; step S2 is used to pressurize the residual raw material in the filter into the residual raw material discharge channel 60 using the nitrogen in the second nitrogen channel 90; step S3 is used to flush the catalyst particles on the surface of the filter cloth 200 by combining the nitrogen in the first nitrogen channel 50 with the water flow in the clean water channel 100 and feed them into the waste material recovery channel 70; step S4 is used to fill the filter chamber 11 with clean water in the clean water channel 100, so that the filter cloth 200 is immersed in the clean water, and further remove the catalyst from the surface of the filter cloth 200 by combining with the nitrogen in the first nitrogen channel 50; step S5 is used to discharge the wastewater in step S4 into the wastewater recovery channel using the nitrogen in the first nitrogen channel 50, completing a single cleaning of the filter cloth 200; step S6 is used to repeat steps S3 to S5. When the preset cleaning time is reached, the cleaning of the filter cloth 200 is completed.

[0084] It is further pointed out that the fourth program-controlled valve 51 is an automatic pulse valve, and the pulse execution interval is 3s.

[0085] In this embodiment, the interior of the filter cloth 200 is impacted in the form of a pulse, which can cause the filter cloth 200 to be in a shaking state, and with the cooperation of the external water flow impact, the catalyst on the surface of the filter cloth 200 is further peeled off. In addition, when the filter cloth 200 is immersed in water, nitrogen will generate bubbles when it flows into the water from the inside out of the filter cloth 200. The impact generated when the bubbles burst can hit the surface of the filter cloth 200 again, thereby further peeling off the catalyst from the surface of the filter cloth 200.

[0086] Preferably, when the filter is put into production again after cleaning, the method further comprises the steps of:

[0087] S7: Open the first program-controlled valve 21 and the third program-controlled valve 41 through the control system to connect the raw material feed channel 20 and the first pipe opening 13, and the raw material discharge channel 40 and the channel between the second pipe opening 14;

[0088] S8: Open the second program-controlled valve 31 through the control system to connect the channel between the purified material discharge channel 30 and the second pipe port 14, and then close the third program-controlled valve 41 to cut off the channel between the raw material discharge channel 40 and the second pipe port 14. At this time, the sound and light alarm prompts, indicating that the current filter is already in working condition.

[0089] In this embodiment, step S7 is set to attach a catalyst filter cake layer to the surface of the filter cloth 200 to assist in filtering catalyst particles with smaller particle sizes. When the raw material flowing out of the raw material discharge channel 40 is clear, the channel between the raw material discharge channel 40 and the second pipe opening 14 is cut off.

[0090] It should be noted that, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their 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 at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0091] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0092] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A filtration system suitable for a petrochemical plant, characterized in that: At least one filter comprising: A vertical filter cartridge having a conical bottom and a filter cavity provided inside the vertical filter cartridge, and a side support for mounting a filter cloth provided on the cavity wall of the filter cavity, wherein the vertical filter cartridge is provided with a first pipe port, a second pipe port, a third pipe port, a fourth pipe port, a fifth pipe port, and a sixth pipe port connected to the filter cavity; A raw material feeding channel is connected to the first pipe opening, and a first program-controlled valve is provided on the raw material feeding channel to automatically connect or disconnect with the first pipe opening; The purified material discharge channel, the raw material discharge channel, and the first nitrogen channel are all connected to the second pipe port, and a second program-controlled valve, a third program-controlled valve, and a fourth program-controlled valve are respectively provided on the purified material discharge channel, the raw material discharge channel, and the first nitrogen channel to automatically connect or disconnect with the second pipe port; The residual raw material discharge channel and the waste material recovery channel are both connected to the third pipe port, and a fifth program-controlled valve and a sixth program-controlled valve are respectively provided on the residual raw material discharge channel and the waste material recovery channel to realize automatic connection or disconnection with the third pipe port; an overflow channel, connected to the fourth pipe port, and provided with a seventh program-controlled valve on the overflow channel for automatically connecting or disconnecting with the fourth pipe port; a second nitrogen channel, connected to the fifth pipe port, and provided with an eighth program-controlled valve on the second nitrogen channel for automatically connecting or disconnecting the second nitrogen channel from the fifth pipe port; The clean water channel is connected to the sixth pipe port, and a ninth program-controlled valve is provided on the clean water channel for automatically connecting to or cutting off the sixth pipe port.

2. The filtration system suitable for petrochemical equipment according to claim 1, characterized in that: The first and third pipe openings are arranged at the bottom of the vertical filter cartridge, the second pipe opening is arranged on the side wall of the vertical filter cartridge and close to one end of the bottom of the vertical filter cartridge, the fourth pipe opening is arranged on the side wall of the vertical filter cartridge and close to one end of the top of the vertical filter cartridge, the fifth and sixth pipe openings are arranged at the top of the vertical filter cartridge, and the second and fourth pipe openings are located on both sides of the vertical filter cartridge.

3. The filtration system suitable for petrochemical equipment according to claim 1, characterized in that: A bottom support is provided on the bottom of the filter cavity, and a connection port connected to the filter cloth and in communication with the first nitrogen channel is provided on the bottom support, wherein the filter cloth is provided in a plate-frame shape.

4. The filtration system suitable for petrochemical equipment according to claim 3, characterized in that: A plurality of side supports are arranged on the wall of the filter chamber, and the plurality of side supports are distributed in a ring shape along the axis direction of the vertical filter cartridge, wherein the two sides of the filter cloth are plugged into and matched with the two side supports on the same horizontal line, and a plurality of connection ports are arranged on the bottom support member, each connection port being connected to the filter cloth bag opening at the corresponding position.

5. The filtration system suitable for petrochemical equipment according to claim 1, characterized in that: A first manual valve is also provided on the raw material feed channel, a second manual valve is also provided on the purified material discharge channel, a third manual valve is also provided on the first nitrogen channel, a fourth manual valve is also provided on the second nitrogen channel, and a fifth manual valve is also provided on the clean water channel. The manual valves are arranged side by side with the program-controlled valves on the corresponding channels.

6. The filtration system suitable for petrochemical equipment according to claim 1, characterized in that: Along the flow direction of the filtrate, a first pressure monitoring point and a second pressure monitoring point are respectively set on both sides of the filter cloth. When the pressure difference between the first pressure monitoring point and the second pressure monitoring point is greater than a preset value, it is judged that the current filter cloth needs to be cleaned.

7. The filtration system suitable for petrochemical equipment according to claim 1, characterized in that: There are multiple filters, and the multiple filters are arranged in parallel, wherein the raw material feed channel, the purified material discharge channel, the raw material discharge channel, the first nitrogen channel, the residual raw material discharge channel, the waste recovery channel, the overflow channel, the second nitrogen channel and the clean water channel are shared by the multiple filters.

8. An online cleaning method using the filtration system according to any one of claims 1 to 7, characterized in that: Including steps: S1: Cut off the raw material feeding channel and the purified material discharging channel; S2: The nitrogen in the second nitrogen channel is used to pressurize the remaining raw materials in the filter cavity into the residual raw material discharge channel; S3: The nitrogen in the first nitrogen channel cooperates with the water flow in the clean water channel to flush the catalyst particles on the surface of the filter cloth and send them into the waste recovery channel; S4: Filling the filter cavity with clean water in the clean water channel so that the filter cloth is immersed in the clean water, and cooperating with the nitrogen in the first nitrogen channel to further peel the catalyst from the surface of the filter cloth; S5: The wastewater in step S4 is discharged into the wastewater recovery channel through the nitrogen in the first nitrogen channel, completing the first cleaning of the filter cloth; S6: Repeat steps S3 to S5. When the preset cleaning time is reached, the filter cloth is cleaned.

9. The online cleaning method according to claim 8, characterized in that: In step S1, the first program-controlled valve and the second program-controlled valve are closed by the control system to cut off the raw material feed channel and the first pipe opening, and to purge the channel between the material discharge channel and the second pipe opening; In step S2, the fifth and eighth program-controlled valves are opened by the control system to connect the residual raw material discharge channel with the third pipe port and the channel between the second nitrogen channel and the fifth pipe port, and the residual raw liquid in the filter cavity is sent into the residual raw material discharge channel by nitrogen. When the preset time is reached, the fifth and eighth program-controlled valves are closed by the control system to cut off the channel between the residual raw material discharge channel and the third pipe port and the channel between the second nitrogen channel and the fifth pipe port, thereby completing the residual raw material return operation; In step S3, the control system sequentially opens the sixth program-controlled valve, the fourth program-controlled valve, and the ninth program-controlled valve to connect the waste recovery channel with the third pipe port, the first nitrogen channel with the second pipe port, and the channel between the clean water channel and the sixth pipe port. Nitrogen is introduced from the bag port of the filter cloth through the first nitrogen channel, and the filter cloth is effectively shaken under the flushing action of the external water flow. When a preset time is reached, the control system closes the sixth program-controlled valve to cut off the channel between the waste recovery channel and the third pipe port. In step S4, the seventh programmable valve is opened by the control system to connect the channel between the overflow channel and the fourth pipe port. When the preset water injection time is reached, the ninth programmable valve is closed by the control system to cut off the channel between the clean water channel and the sixth pipe port. Then, after a preset time delay, the fourth programmable valve and the seventh programmable valve are closed by the control system to cut off the channels between the first nitrogen channel and the second pipe port, and between the overflow channel and the fourth pipe port. In step S5, the sixth and eighth program-controlled valves are opened by the control system to connect the waste recovery channel with the third pipe port, and the channel between the second nitrogen channel and the fifth pipe port. The wastewater in step S4 is pressed into the waste recovery channel by the nitrogen in the second nitrogen channel. When the preset time is reached, the eighth and sixth program-controlled valves are closed in sequence, cutting off the channel between the second nitrogen channel and the fifth pipe port, and the channel between the waste recovery channel and the third pipe port, thereby completing the primary cleaning of the filter cloth.

10. The online cleaning method according to claim 8, characterized in that: When the cleaning is complete and the filter is put back into production, the following steps are also included: S7: Opening the first program-controlled valve and the third program-controlled valve through the control system to connect the raw material feed channel and the first pipe port, and the raw material discharge channel and the channel between the second pipe port; S8: Open the second program-controlled valve through the control system to connect the channel between the purified material discharge channel and the second pipe outlet, and then close the third program-controlled valve to cut off the channel between the raw material discharge channel and the second pipe outlet. At this time, the sound and light alarm prompts, indicating that the current filter is already in working condition.

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