A catalyst settling system with good running stability and settling effect
By improving the flow control and feed stability of the catalyst settling system, the problem of insufficient catalyst settling was solved, achieving stable system operation and long-term equipment operation, and reducing energy consumption and maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIHUA YIHUIHAI NEW MATERIALS (LIJIN) CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-06-23
AI Technical Summary
Existing catalyst settling systems suffer from insufficient catalyst particle settling due to flow fluctuations and unstable feed, affecting system stability and the operation of downstream units, leading to equipment blockage, increased energy consumption, and equipment damage.
A catalyst settling system was designed, comprising a clarification mechanism, a sludge buffer tank, a feed pipeline, a sludge tank, a return pipeline, an overflow pipeline, a filter press, a filtrate tank, and a sludge discharge pipeline. By using a combination of regulating valves and pumps, the flow rate in the clarification tank is ensured to be stable, flow fluctuations are reduced, and stable catalyst settling is achieved.
It improves the stability and settling effect of the catalyst settling system, reduces the frequency of blockage in downstream units, extends the operating cycle, reduces energy consumption and maintenance costs, and improves overall production efficiency and economic benefits.
Smart Images
Figure CN224388292U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of petrochemical technology, specifically to a catalyst settling system that operates smoothly and has a good settling effect. Background Technology
[0002] The catalyst settling system in the acrylonitrile plant serves as a crucial link between the reaction unit and subsequent processing steps; its stable operation directly impacts the overall production efficiency and economy of the SAR (Separation and Reduction) unit. In actual industrial production, this system is subject to numerous complex variables, posing significant challenges to its operational stability and separation efficiency.
[0003] From an operational perspective, existing sedimentation systems require frequent start-stop cycles of sludge settling pumps at each stage to transport sludge to the sludge tank. This intermittent material transfer pattern inevitably leads to drastic fluctuations in flow rate within the clarifier. These large flow rate oscillations not only disrupt the original solid-liquid separation environment within the clarifier but also make it difficult to maintain stable fluid dynamics during sedimentation, severely impacting the settling effect of catalyst particles. Simultaneously, the existing sedimentation system's filtrate pumps, designed for interlocked start-stop based on filtrate tank levels, also cause instability in the clarifier's feed rate when transferring filtrate to the clarifier. The feed fluctuations and the flow rate changes caused by the sludge settling pumps combine to further exacerbate system instability.
[0004] The chain reaction caused by the aforementioned system fluctuations cannot be ignored. Under unstable system conditions, a large number of insufficiently settled catalyst particles will be carried into the ammonium sulfate solution and enter the downstream ammonium sulfate concentration unit along with the solution. These catalyst particles continuously deposit and adhere to the tubes of the first and second-effect evaporators and the system's internal pipelines, leading to frequent blockages in the equipment and pipelines. This blockage not only significantly reduces the heat transfer efficiency of the evaporators and increases energy costs, but also significantly shortens the unit's operating cycle. To ensure normal operation, frequent cleaning of the ammonium sulfate concentration unit is necessary, which not only increases manpower and material costs but also causes unplanned shutdowns, severely impacting the overall operating efficiency and economic benefits of the SAR unit. Furthermore, frequent cleaning operations may also cause some damage to the equipment, further shortening its service life and increasing maintenance costs. Utility Model Content
[0005] This invention provides a catalyst settling system that operates smoothly and has a good settling effect. Its purpose is to solve the problem that the clarification tank of the existing catalyst settling system is prone to flow fluctuations, resulting in insufficient settling of catalyst particles.
[0006] To achieve the above objectives, the technical solution of this utility model is as follows:
[0007] This utility model provides a catalyst settling system that operates smoothly and has a good settling effect, including a clarification mechanism, a sludge buffer tank, a feed pipeline, a sludge tank, a return pipeline, an overflow pipeline, a filter press, a filtrate tank, and a sludge discharge pipeline;
[0008] The clarification mechanism includes multiple settling tanks arranged side by side from front to back, and a clarification tank located at the end of the clarification mechanism;
[0009] The bottom of the clarification tank is equipped with a dedicated ammonium sulfate solution discharge pipeline, which is equipped with an ammonium sulfate solution pump. The end of the ammonium sulfate solution discharge pipeline extends to the ammonium sulfate tank area. The outlet end of the ammonium sulfate solution pump is equipped with a branch pipeline, which is connected to the feed inlet at the top of the filtrate tank through a regulating valve. The bottom outlet of the filtrate tank is connected to the inlet of the clarification mechanism through a filtrate pump.
[0010] The sludge buffer tank is located at the bottom of the clarification mechanism; the lowest point of each settling tank is connected to the feed pipeline via a drain valve, and the outlet end of the feed pipeline is connected to the top inlet of the sludge buffer tank via a switch valve one; the bottom of the side wall of the sludge buffer tank is connected to one end of the sludge discharge pipeline, and the other end of the sludge discharge pipeline is connected to two branch pipelines, one of which is connected to the lowest point of the sludge tank via a switch valve five, and the other branch pipeline is connected to the inlet of the filter press via a switch valve twelve; the liquid outlet of the filter press is connected to the feed inlet at the top of the filtrate tank; the sludge discharge pipeline is equipped with a switch valve eight, a switch valve nine, an anti-wear centrifugal pump, and a switch valve ten in sequence from front to back;
[0011] During normal operation, the liquid level in the sludge tank is higher than the liquid level in the clarification unit; one end of the overflow pipeline is connected to the top of the side wall of the sludge tank through the upper and lower pipe openings, and the other end of the overflow pipeline is connected to the top of the side wall of the clarification tank.
[0012] The lowest point of the sludge tank is higher than the highest point of the sludge buffer tank; the bottom of the side wall of the sludge tank is connected to one end of the return pipeline, and the other end of the return pipeline is connected to the lowest point of the sludge buffer tank; a second switch valve and a third switch valve are arranged sequentially from front to back on the return pipeline.
[0013] Furthermore, each settling tank is equipped with a funnel-shaped collection mechanism at the bottom, which is a frustum-shaped structure that is wider at the top and narrower at the bottom.
[0014] Furthermore, a sampling port is also provided on the sludge discharge pipeline, and the sampling port is controlled to open and close by a switch valve eleven.
[0015] Furthermore, overflow sight glasses are respectively provided at the upper and lower pipe openings.
[0016] Furthermore, the return pipeline is connected to the sludge discharge pipeline via a four-way valve.
[0017] Furthermore, a gas phase balance pipeline is provided between the top of the sludge buffer tank and the top of the clarification tank. A switch valve six is provided near the end of the gas phase balance pipeline closest to the sludge buffer tank, and a switch valve seven is provided near the end of the gas phase balance pipeline closest to the clarification tank.
[0018] Furthermore, a level gauge is installed inside the filtrate tank.
[0019] The beneficial effects achieved by this utility model are as follows:
[0020] The efficiency of the catalyst settling system has been significantly improved: through innovative improvements to the operating modes of the sludge settling pump and filtrate pump, drastic fluctuations in the clarifier flow rate have been effectively eliminated, enabling the system to operate at a highly stable state. Stable fluid dynamics conditions create an ideal settling environment for catalyst particles, significantly improving the settling and separation effect. The entry of unsettled catalyst particles into downstream units has been greatly reduced, consequently significantly decreasing the frequency of blockages in the tubes and pipelines of the first and second-effect evaporators in the ammonium sulfate concentration unit. The operating cycle of downstream units has been extended, reducing unplanned shutdowns and ensuring continuous and stable production of the SAR unit, resulting in a significant improvement in overall operating efficiency.
[0021] The filter press's operational performance has been comprehensively optimized: By stabilizing the output of the catalyst settling system, the composition and flow rate of the feed material to the filter press are kept constant, creating stable operating conditions. Under these conditions, the filter press operates more smoothly, the filter cake forming speed is significantly accelerated, and the drying effect is excellent, effectively avoiding problems such as loose filter cake and high moisture content caused by unstable feed. At the same time, stable operating conditions greatly extend the service life of the filter cloth and reduce filter cloth replacement costs. Furthermore, the improved efficiency in filter cake forming and drying significantly shortens the filter press's operating time, reducing equipment downtime, lowering energy consumption, and significantly improving the overall operational quality of the unit, bringing considerable economic benefits to the enterprise.
[0022] This utility model discloses an alternative design that provides new feasibility for improving catalyst settling systems. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model; in the figure, the X-axis is defined as the front-back direction (longitudinal), and its arrow points to the rear; the Z-axis is defined as the up-down direction (vertical), and its arrow points to the up.
[0025] In the diagram, 100 is the clarification mechanism; 110 is the ammonium sulfate solution discharge pipeline; 111 is the ammonium sulfate solution pump; 112 is the regulating valve; 120 is the settling tank; 130 is the clarification tank; 140 is the drain valve; 200 is the sludge buffer tank; 210 is the feed pipeline; 211 is the first switch valve; 300 is the sludge tank; 310 is the return pipeline; 311 is the second switch valve; 312 is the third switch valve; 313 is the fourth switch valve; 320 is the overflow pipeline; and 321 is the upper pipe inlet. 322. Lower section pipe inlet; 323. Overflow sight glass; 330. Switch valve five; 400. Filter press; 500. Filtrate tank; 510. Level gauge; 520. Filtrate pump; 600. Gas phase balance pipeline; 610. Switch valve six; 620. Switch valve seven; 700. Sludge discharge pipeline; 710. Switch valve eight; 720. Switch valve nine; 730. Switch valve ten; 740. Switch valve eleven; 750. Switch valve twelve; 760. Anti-wear centrifugal pump. Detailed Implementation
[0026] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0029] like Figure 1 As shown, this utility model provides a catalyst settling system with stable operation and good settling effect, including a clarification mechanism 100, a sludge buffer tank 200, a feed pipeline 210, a sludge tank 300, a return pipeline 310, an overflow pipeline 320, a filter press 400, a filtrate tank 500, and a sludge discharge pipeline 700.
[0030] The clarification mechanism 100 adopts existing technology, and its inlet is connected to the outlet of the quench tower via a pipeline. It is used to receive the material discharged from the quench tower and perform solid-liquid separation treatment. Specifically, the clarification mechanism 100 includes a plurality of settling tanks 120 arranged side by side from front to back, and a clarification tank 130 located at the end of the clarification mechanism 100.
[0031] Each settling tank 120 is equipped with a funnel-shaped collecting mechanism at its bottom. This collecting mechanism is a frustum-shaped structure, wider at the top and narrower at the bottom. Its larger diameter end is fitted and sealed to the bottom opening of the settling tank 120, while the smaller diameter end is used to collect the catalyst particles separated during the settling process. The settling tank 120 is mainly used to achieve the settling and separation of catalyst particles in the material. Under the action of gravity, the denser catalyst particles gradually sink to the bottom of the tank and are collected by the funnel-shaped collecting mechanism. The clarification tank 130 is used to receive the material after preliminary treatment in the settling tank 120, further achieving solid-liquid separation, and finally collecting the clearer solution at the top. Specifically, after the material from the quench tower enters the clarification mechanism 100, it passes through each settling tank 120 in sequence from front to back. The catalyst particles in the solution settle at the bottom of each settling tank 120, while the clarified liquid enters the clarification tank 130.
[0032] A dedicated ammonium sulfate solution discharge pipeline 110 is installed at the bottom of the clarification tank 130. The ammonium sulfate solution discharge pipeline 110 is made of corrosion-resistant material, with one end sealed to the discharge port at the bottom of the clarification tank 130, and the other end extending along a predetermined path to the ammonium sulfate tank area. An ammonium sulfate solution pump 111 is installed on the ammonium sulfate solution discharge pipeline 110, which can pressurize and transport the separated ammonium sulfate solution in the clarification tank 130 to the ammonium sulfate tank area for storage.
[0033] In addition, a branch pipeline is provided at the outlet end of the ammonium sulfate solution pump 111. This branch pipeline is connected to the ammonium sulfate solution discharge pipeline 110 via a flange, and the other end is connected to the feed inlet at the top of the filtrate tank 500. A regulating valve 112 is installed on the branch pipeline. During operation, the regulating valve 112 is ensured to be either partially open (opening degree > 0% and < 100%) or fully open (opening degree 100%) to ensure that a portion of the ammonium sulfate solution continuously flows into the filtrate tank 500 through the branch pipeline. The core purpose of this design is to maintain the continuous operation of the filtrate pump 520 to ensure a continuous supply of filtrate to the clarification tank 130, guaranteeing a stable feed to the clarification mechanism 100. This effectively avoids the adverse effects of feed fluctuations on the settling effect of the clarification mechanism 100, ensuring the stability and reliability of the entire system operation.
[0034] The sludge buffer tank 200 is located at the bottom of the clarification mechanism 100; the lowest point of each settling tank 120 is connected to the feed pipeline 210 via a drain valve 140, and the outlet end of the feed pipeline 210 is connected to the top inlet of the sludge buffer tank 200 via a switch valve 211. The bottom of the side wall of the sludge buffer tank 200 is connected to one end of the sludge discharge pipeline 700, and the other end of the sludge discharge pipeline 700 is connected to two branch pipelines. One branch pipeline is connected to the lowest point of the sludge tank 300 via a switch valve 330, and the other branch pipeline is connected to the inlet of the filter press 400 via a switch valve 750; the liquid outlet of the filter press 400 is connected to the feed inlet at the top of the filtrate tank 500.
[0035] The sludge discharge pipeline 700 is equipped with a switch valve 8 710, a switch valve 9 720, an anti-wear centrifugal pump 760, and a switch valve 10 730 in sequence from the front (where it connects to the sludge buffer tank 200) to the rear (where it connects to the two branch pipelines); wherein, the anti-wear centrifugal pump 760 is a P-6103 sludge pump anti-wear centrifugal pump 760.
[0036] The sludge discharge pipeline 700 is also equipped with a sampling port, which is controlled to open and close by a switch valve 740. The switch valve 740 is located between the switch valve 730 and the two branch pipelines. The sampling port is used for periodic sampling and observation to monitor the sedimentation effect.
[0037] One end of the overflow pipeline 320 is connected to the top of the side wall of the sludge tank 300 through the upper section pipe port 321 and the lower section pipe port 322, and the other end of the overflow pipeline 320 is connected to the top of the side wall of the clarification tank 130; the upper section pipe port 321 and the lower section pipe port 322 are respectively provided with overflow sight glasses 323, which are used to observe the overflow of clear liquid in the upper part of the sludge tank 300.
[0038] The bottom of the side wall of the sludge tank 300 is connected to one end of the return pipeline 310, and the other end of the return pipeline 310 is connected to the lowest point of the sludge buffer tank 200. A second switch valve 311 and a third switch valve 312 are sequentially installed on the return pipeline 310 from front (near the sludge buffer tank 200) to back (near the sludge tank 300). The return pipeline 310 serves two purposes: firstly, to prevent sludge accumulation at the bottom of the sludge buffer tank 200, and secondly, to ensure the continuous operation of the anti-wear centrifugal pump 760. The return pipeline 310 is connected to the sludge discharge pipeline 700 via a fourth switch valve 313. The connection point between the fourth switch valve 313 and the return pipeline 310 is located between the second switch valve 311 and the third switch valve 312. The connection point between the fourth switch valve 313 and the sludge discharge pipeline 700 is located between the tenth switch valve 730 and the sampling port.
[0039] Furthermore, there is a vertical height difference between the lowest point of the sludge tank 300 and the highest point of the sludge buffer tank 200, with the lowest point of the sludge tank 300 being higher than the highest point of the sludge buffer tank 200. This ensures that the material in the sludge tank 300 can flow to the sludge buffer tank 200 by gravity. Simultaneously, the normal operating liquid level in the sludge tank 300 is higher than the liquid level in the clarification mechanism 100, forming a stable liquid level gradient. Based on the principle of communicating vessels and the liquid level difference, when the liquid level in the sludge tank 300 exceeds the set level, the excess liquid can automatically overflow to the clarification tank 130 through the overflow pipe 320, without the need for additional power equipment. This avoids unsatisfactory settling effects in the clarification mechanism 100 due to fluctuations in the feed rate. This design not only achieves automatic adjustment of the liquid level in the sludge tank 300 but also effectively prevents sludge buildup caused by material retention and deposition in the sludge buffer tank 200, ensuring smooth material transport and stable system operation.
[0040] Furthermore, a gas phase balance pipeline 600 is provided between the top of the sludge buffer tank 200 and the top of the clarification tank 130. The gas phase balance pipeline 600 can prevent the gas pressure inside the sludge buffer tank 200 from being too high, which would prevent the material from entering the sludge buffer tank 200. A switch valve 610 is provided near the end of the gas phase balance pipeline 600 close to the sludge buffer tank 200, and a switch valve 620 is provided near the end of the gas phase balance pipeline 600 close to the clarification tank 130.
[0041] The bottom outlet of the filtrate tank 500 is connected to the inlet of the clarification mechanism 100 via a filtrate pump 520. The filtrate pump 520 provides pressure to the solution in the filtrate tank 500, so that it is continuously transported to the clarification mechanism 100, thereby avoiding unsatisfactory sedimentation effect in the clarification mechanism 100 due to fluctuations in the feed rate.
[0042] Furthermore, a level gauge 510 is installed inside the filtrate tank 500. The level gauge 510 is connected to the control module, which performs interlock control on the filtrate pump 520 based on the monitoring value of the level gauge 510. Specifically, since the valve between the ammonium sulfate solution pump 111 and the filtrate tank 500 is a regulating valve 112, and the regulating valve 112 is always open under normal conditions, the filtrate pump 520 can be continuously started, which is equivalent to expanding the start-stop interlock range of the filtrate pump 520. The start-up interlock value of the filtrate pump 520 is 70%, and the stop-down interlock value is 10%.
[0043] Furthermore, all of the above-mentioned switching valves are solenoid valves.
[0044] Furthermore, this utility model also includes a control module, which comprises a control chip, corresponding control circuits, and several control buttons. The control chip can be a PLC controller. This PLC controller is connected to the aforementioned switching valves and pumps and is used to control this utility model; additionally, workers can also manually control the aforementioned valves and pumps using the control buttons. For those skilled in the art, the various functions of the control module are readily apparent from the description herein; therefore, its specific principles and details will not be elaborated further.
[0045] Under normal circumstances, the workflow of this utility model is as follows:
[0046] Switch valve 610 and switch valve 720 are normally open.
[0047] The clarification unit 100 receives material from the quench tower and periodically opens and closes the bottom drain valves 140 of each settling tank 120. When the drain valve 140 is opened, the switch valve 211 is opened at the same time, and the catalyst particles in the clarification unit 100 flow by gravity into the sludge buffer tank 200, which enhances the settling effect of the clarification tank 130.
[0048] After a period of time, switch valves 8 (710), 9 (720), 760 (abrasion-resistant centrifugal pump), 730 (10), and 330 (5) are normally open. The abrasion-resistant centrifugal pump 760 transfers part of the sludge in the sludge buffer tank to the sludge tank 300. The sludge concentration is checked periodically through the sampling port to ensure it is within acceptable limits. When the sludge concentration is within acceptable limits, switch valve 12 (750) is opened. The abrasion-resistant centrifugal pump 760 simultaneously feeds the sludge tank 300 and the filter press 400. Since the abrasion-resistant centrifugal pump 760 and the filtrate pump 520 are normally open, the feed rate is stable, and the flow rate in the clarification mechanism 100 is stable, which avoids the impact on the clarification mechanism 100 caused by the frequent start-stop of the sludge settling pump.
[0049] The material in the sludge buffer tank enters the bottom of the sludge tank 300 through the wear-resistant centrifugal pump 760. The heavy components in the material in the sludge tank 300 settle downwards under the action of gravity, and the material concentration gradually decreases from bottom to top. The relatively clean material at the top of the sludge tank 300 overflows to the clarification tank 130 through the pipeline, and the heavy components remain in the sludge tank 300 and the concentration continuously increases.
[0050] When it is found through the sight glass on the return line 310 that the return flow from the sludge tank 300 to the sludge buffer tank is not smooth, open the switch valve 313 to flush the return line 310.
[0051] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A catalyst settling system that operates smoothly and has a good settling effect, characterized by: It includes a clarification unit (100), a sludge buffer tank (200), a feed line (210), a sludge tank (300), a return line (310), an overflow line (320), a filter press (400), a filtrate tank (500), and a sludge discharge line (700); The clarification mechanism (100) includes a plurality of settling tanks (120) arranged side by side from front to back, and a clarification tank (130) located at the end of the clarification mechanism (100); The clarification tank (130) is equipped with an ammonium sulfate solution discharge pipeline (110) at the bottom, and an ammonium sulfate solution pump (111) is installed on the ammonium sulfate solution discharge pipeline (110). The end of the ammonium sulfate solution discharge pipeline (110) extends to the ammonium sulfate tank area. A branch pipeline is provided at the outlet end of the ammonium sulfate solution pump (111), and this branch pipeline is connected to the feed port at the top of the filter tank (500) through a regulating valve (112). The bottom outlet of the filter tank (500) is connected to the inlet of the clarification mechanism (100) through a filter pump (520). The sludge buffer tank (200) is located at the bottom of the clarification mechanism (100); the lowest point of each settling tank (120) is connected to the feed pipeline (210) via a drain valve (140), and the outlet end of the feed pipeline (210) is connected to the top inlet of the sludge buffer tank (200) via a switch valve (211); the bottom of the side wall of the sludge buffer tank (200) is connected to one end of the sludge discharge pipeline (700), and the other end of the sludge discharge pipeline (700) is connected to... There are two branch lines. One branch line is connected to the lowest point of the sludge tank (300) through switch valve five (330), and the other branch line is connected to the inlet of the filter press (400) through switch valve twelve (750). The liquid outlet of the filter press (400) is connected to the feed inlet at the top of the filtrate tank (500). The sludge discharge line (700) is provided with switch valve eight (710), switch valve nine (720), anti-wear centrifugal pump (760) and switch valve ten (730) in sequence from front to back. During normal operation, the liquid level in the sludge tank (300) is higher than the liquid level in the clarification mechanism (100); one end of the overflow pipeline (320) is connected to the top of the side wall of the sludge tank (300) through the upper section pipe port (321) and the lower section pipe port (322), and the other end of the overflow pipeline (320) is connected to the top of the side wall of the clarification tank (130); The lowest point of the sludge tank (300) is higher than the highest point of the sludge buffer tank (200); the bottom of the side wall of the sludge tank (300) is connected to one end of the return pipeline (310), and the other end of the return pipeline (310) is connected to the lowest point of the sludge buffer tank (200); a second switch valve (311) and a third switch valve (312) are arranged sequentially from front to back on the return pipeline (310).
2. The catalyst settling system according to claim 1, wherein: Each settling tank (120) is equipped with a trumpet-shaped collection mechanism at the bottom, which is a frustum-shaped structure that is wider at the top and narrower at the bottom.
3. The catalyst settling system of claim 1, wherein: The sludge discharge pipeline (700) is also equipped with a sampling port, which is controlled to open and close by a switch valve eleven (740).
4. The catalyst settling system of claim 1, wherein: The upper section pipe opening (321) and the lower section pipe opening (322) are respectively equipped with overflow sight glasses (323).
5. The catalyst settling system of claim 1, wherein: The return pipeline (310) is connected to the sludge discharge pipeline (700) via a four-way valve (313).
6. The catalyst settling system of claim 1, wherein: A gas phase balance pipeline (600) is also provided between the top of the sludge buffer tank (200) and the top of the clarification tank (130). A switch valve six (610) is provided near the end of the gas phase balance pipeline (600) close to the sludge buffer tank (200), and a switch valve seven (620) is provided near the end of the gas phase balance pipeline (600) close to the clarification tank (130).
7. The catalyst settling system of claim 1, wherein: A level gauge (510) is installed inside the filtrate tank (500).