An online sand cleaning system and method for tanks

Abstract

This invention discloses an online sand removal system and method for tanks, relating to the field of sand removal equipment technology. The system includes a solid-liquid separation device, a sand discharge pipe, and an adjustment device. The sand discharge pipe comprises an outer pipe and an inner pipe inserted within the outer pipe. A sand discharge channel is formed between the inner side of the outer pipe and the outer side of the inner pipe. The sand discharge channel is connected to the inlet of the solid-liquid separation device. One end of the inner pipe is connected to a high-pressure water flow. The adjustment device is used to extend the sand discharge pipe into or pull it out of the tank. This invention sprays high-pressure water into the tank through the inner pipe, impacting the sand and silt deposited in the tank, thereby improving the sand removal effect. Furthermore, the adjustment device can adjust the position of the end of the sand discharge pipe within the tank, thereby expanding the sand removal area and improving the sand removal efficiency and effect.

Description

Technical Field

[0001] This invention relates to the field of sand cleaning equipment technology, specifically to an online sand cleaning system and method for tanks. Background Technology

[0002] Due to the complexity of urban organic solid waste and agricultural waste, and the many uncontrollable factors in the pretreatment process (such as equipment wear and tear, misoperation, etc.), the slurry entering the anaerobic fermentation system after pretreatment contains a certain amount of sand and gravel. The specific content depends on the impurity removal efficiency of the pretreatment system and the total amount of impurities in the raw materials. Currently, most anaerobic fermenters use mechanical agitation. All forms of mechanical agitation have a relative dead zone, which is the area with a lower flow velocity. Sand and gravel in the slurry enter the flow field inside the tank with the agitation of the agitator, but most of the sand and gravel, especially larger and denser particles, will gradually settle in the area with the weaker flow field inside the tank. These large, heavy particles mainly include sand and gravel that were not completely removed during pretreatment, broken glass shards, ceramic shards, and undigested seed husks, bamboo and wood particles that cannot be digested by anaerobic fermentation, with particle sizes generally ranging from 1 to 15 mm. Meanwhile, the organic matter in the slurry degrades significantly after entering the anaerobic system, resulting in a substantial decrease in the total slurry (TS) content and viscosity. Small-diameter sand and gravel also precipitate, forming sediment in the tank. If this sediment is not removed promptly during operation, it can harm the entire system. First, the sediment gradually encroaches on the internal space of the anaerobic digester, reducing its effective volume and thus its processing capacity. This increases the risk of tank acidification and the pressure on downstream wastewater treatment. As the sediment buildup increases, instruments (such as thermometers and level gauges) and valves may become covered, affecting their normal operation. Furthermore, the agitator resistance increases, potentially leading to shaft breakage and directly impacting the tank's foundation flatness and overall safety.

[0003] Therefore, the accumulation of sediment at the bottom of the tank seriously affects the normal operation of the anaerobic fermentation system for organic waste, and reasonable and effective measures must be taken to minimize the impact. Currently, most continuous biogas fermentation projects require periodic overall cleaning of the reactor to remove accumulated sand during actual operation, which consumes a lot of manpower and resources and requires a lot of time to restart the fermentation system, seriously affecting the normal operation of the project. At present, with the continuous increase in the operation time of biogas projects, a large number of anaerobic reactors have experienced varying degrees of sediment accumulation at the bottom of the tank. The cost of shutting down and cleaning the tanks is too high, so a large number of reactors are operating in a defective state. Therefore, online external continuous sand removal technology is needed to equip existing anaerobic fermentation tanks to directly remove sediment at the bottom of the tank during operation, thereby significantly reducing the hazards caused by sediment in existing anaerobic tanks and extending the tank cleaning cycle.

[0004] Existing sand removal devices generally include a sand discharge pipe extending into the anaerobic tank, and then the other end of the sand discharge pipe is connected to a solid-liquid separation device to separate the solid precipitate from the liquid, and then the liquid is transported back to the tank. Although such sand removal devices can extract the precipitate from the tank, the position of the sand discharge pipe opening in the tank is always fixed, resulting in many dead corners in the tank, making it impossible to remove the precipitate in time.

[0005] In view of this, there is an urgent need for an online sand cleaning system for tanks. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention solves this problem using the following technical structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An online sand removal system for tanks includes: a solid-liquid separation device, a sand discharge pipe, and a regulating device;

[0009] The sand discharge pipe includes an outer pipe and an inner pipe inserted inside the outer pipe. The inner side of the outer pipe and the outer side of the inner pipe form a sand discharge channel. The sand discharge channel is connected to the inlet of the solid-liquid separation device. One end of the inner pipe is connected to a high-pressure water flow.

[0010] The adjusting device is used to extend the sand discharge pipe into the tank or pull it out of the tank.

[0011] Its further feature is that,

[0012] The sand discharge pipe is provided with two regulating channels. The outlets of the two regulating channels are located opposite each other on the suspension end ring side of the sand discharge pipe. The two regulating channels are connected to high-pressure water flow.

[0013] A bending sensor is provided on one side of each of the two adjustment channels.

[0014] The suspended end of the sand discharge pipe is provided with a pipe head, and several impellers are provided inside the pipe head.

[0015] The outer side of the end of the pipe head is provided with a flared opening.

[0016] The adjustment device includes a frame, a sliding seat, and a drive mechanism. The sliding seat is slidably mounted on the frame, the sand discharge pipe is mounted on the sliding seat, and the drive mechanism is used to drive the sliding seat to slide on the frame.

[0017] The driving mechanism includes a motor and a lead screw. The lead screw is rotatably mounted on the frame. The sliding seat passes through the lead screw and is threadedly connected to the lead screw. The motor is mounted on the frame and is used to drive the lead screw to rotate.

[0018] The bottom of the frame is equipped with several pulleys.

[0019] The drive mechanism also includes a height adjustment rod, which is mounted on the frame. One end of the height adjustment rod is connected to the sand discharge pipe and is used to adjust the horizontal height of the sand discharge pipe.

[0020] A method for online sand removal of tanks, applied to an online sand removal system for tanks, characterized by the following steps:

[0021] Insert the end of the sand discharge pipe into the tank;

[0022] The inner tube injects high-pressure water into the tank, and the sand discharge channel extracts the sediment in the tank to the solid-liquid separation device.

[0023] When it is necessary to adjust the position of the end of the sand discharge pipe;

[0024] The sand discharge pipe can be extended into the tank or pulled out of the tank using an adjustment device.

[0025] By introducing high-pressure water into one of the regulating channels, the high-pressure water jets out from the outlet of the regulating channel, causing the end of the sand discharge pipe to swing to the other side.

[0026] The following beneficial effects can be achieved by using the structure described above in this invention:

[0027] 1) High-pressure water jets are sprayed into the tank through the inner pipe to impact the sand and silt deposited in the tank, thereby improving the sand removal effect. The adjustment device can adjust the position of the end of the sand discharge pipe in the tank to expand the sand removal area and improve the sand removal efficiency and effect.

[0028] 2) By introducing high-pressure water into an adjustment channel, the high-pressure water is discharged from the outlet of the adjustment channel. This causes the end of the sand discharge pipe to be subjected to a force opposite to the direction of the high-pressure water discharge, causing the end of the sand discharge pipe to turn. This ensures that sediment in all directions inside the tank is cleaned. To improve sand cleaning efficiency, a bending sensor is installed on one side of both adjustment channels. By measuring the length of the sand discharge pipe entering the tank and combining the bending degree of the sand discharge pipe detected by the bending sensor, the position of the end of the sand discharge pipe inside the tank can be calculated. This allows for precise control of the position of the end of the sand discharge pipe and efficient sand cleaning.

[0029] 3) High-pressure water is injected into the tank through the inner pipe. The water flow drives the impeller to rotate. After the high-pressure water passes through the impeller, it also has enough scouring force to impact the sand and silt deposited in the tank. At the same time, the impeller carries the slurry and sand into the sand discharge channel and is extracted to the outside of the tank. A flared mouth can be set on the outside of the end of the pipe to expand the area of ​​the slurry inlet. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the sand discharge pipe and regulating device in this invention;

[0031] Figure 2 This is a schematic cross-sectional view of the sand discharge pipe in Embodiment 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of the pipe head structure in Embodiment 2 of the present invention.

[0033] In the diagram: 1. Adjustment device; 11. Frame; 12. Sliding seat; 13. Motor; 14. Lead screw; 15. Pulley; 16. Height adjustment rod; 2. Outer tube; 3. Inner tube; 4. Sand discharge channel; 5. Bending sensor; 6. Impeller; 7. Trumpet mouth; 8. Adjustment channel. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, area, product or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product or device.

[0036] The following combination Figures 1-3 The present invention will be further described in detail below.

[0037] Example 1, as Figure 1As shown, an online sand removal system for a tank includes: a solid-liquid separation device (not shown), a sand discharge pipe, and an adjusting device 1. The sand discharge pipe includes an outer pipe 2 and an inner pipe 3 passing through the outer pipe 2. The inner side of the outer pipe 2 and the outer side of the inner pipe 3 form a sand discharge channel 4, which is connected to the inlet of the solid-liquid separation device. One end of the inner pipe 3 is connected to a high-pressure water flow. The adjusting device 1 is used to extend the sand discharge pipe into the tank or pull it out of the tank. Thus, in use, the end of the sand discharge pipe is slowly inserted into the anaerobic tank (or the bottom of the tank). After the end of the sand discharge pipe reaches the set position, the circulation pump connected to the sand discharge pipe is turned on, and the sand discharge pipe is discharged through the sand discharge channel 4 between the outer pipe 2 and the inner pipe 3. The sediment (such as mortar) in the tank is extracted to the solid-liquid separation device. The solid-liquid separation device separates the fixed sediment from the slurry. The separated slurry is then transported back to the tank (the inner pipe 3 can be connected to the outlet of the solid-liquid separation device so that the slurry can return to the tank through the inner pipe 3. Alternatively, a separate pipeline can be installed to transport the slurry back to the tank). To improve the sand removal efficiency of the tank, high-pressure water (or slurry) is sprayed into the tank through the inner pipe 3 to impact the sand and silt deposited in the tank, thereby improving the sand removal effect. In addition, the adjusting device 1 can adjust the position of the end of the sand discharge pipe inside the tank 1 to expand the sand removal area and improve the sand removal efficiency and effect.

[0038] like Figure 1 and 2 As shown, to further expand the movement range of the sand discharge pipe within the tank, two regulating channels 8 are installed inside the sand discharge pipe. The outlets of the two regulating channels 8 are positioned opposite each other on the suspension end ring side of the sand discharge pipe. High-pressure water flow is connected to both regulating channels 8 (or they can be connected to the outlet of a solid-liquid separation device, allowing the separated slurry to enter one or both regulating channels 8). Thus, when it is necessary to adjust the orientation of the sand discharge pipe end, high-pressure water flow is introduced into one regulating channel 8, causing the high-pressure water flow to exit from the outlet of that regulating channel 8. This subjects the sand discharge pipe end to a force opposite to the direction of the high-pressure water flow, causing the sand discharge pipe end to rotate (i.e.,...). (The sand discharge pipe is bent) to ensure that sediment in all directions inside the tank is cleaned. To improve the sand cleaning efficiency, a bend sensor 5 is installed on one side of each of the two adjustment channels 8. By measuring the length of the sand discharge pipe entering the tank and the degree of bend detected by the bend sensor 5, the position of the end of the sand discharge pipe inside the tank can be calculated. This allows for precise control of the position of the end of the sand discharge pipe and efficient sand cleaning. To better achieve the function, a rigid pipe head is installed at the end of the sand discharge pipe. The opening of the adjustment channel 8 is located on the rigid pipe head, while the part of the sand discharge pipe extending into the tank is made of soft material.

[0039] like Figure 1 and 2As shown, in order to realize the movement of the sand discharge pipe, the adjusting device 1 includes a frame 11, a sliding seat 12, and a driving mechanism. The sliding seat 12 is slidably mounted on the frame 11 (the frame 11 is provided with a slide rail, and the sliding seat 12 is locked on the slide rail to guide and restrict the movement of the sliding seat 12). The sand discharge pipe is mounted on the sliding seat 12. The driving mechanism is used to drive the sliding seat 12 to slide on the frame 11. The driving mechanism specifically includes a motor 13 and a lead screw 14. The lead screw 14 is rotatably mounted on the frame 11, and the sliding seat 12 passes through the lead screw 14. The sliding seat 12 and the lead screw 14 are threadedly connected. The motor 13 is mounted on the frame 11 and is used to drive the lead screw 14 to rotate. In this way, by driving the lead screw 14 to rotate through the motor 13, the sliding seat 12 is moved horizontally on the frame 11 (the sliding seat 12 moves closer to or away from the tank), so that the sand discharge pipe is inserted into the tank or pulled out of the tank, thereby achieving the purpose of adjusting the position of the end of the sand discharge pipe.

[0040] To further optimize the device and improve its ease of use, several casters 15 are provided at the bottom of the frame 11, allowing for easy movement of the device.

[0041] Further optimization includes a height adjustment rod 16 on the drive mechanism. The height adjustment rod 16 is mounted on the frame 11. One end of the height adjustment rod 16 can be connected to the sand discharge pipe, and the other end can be mounted on the frame 11 or the sliding seat 12. By adjusting the height of the height adjustment rod 16 or setting the height adjustment rod 16 as a telescopic rod, the horizontal height of the sand discharge pipe can be adjusted to adapt to tank interfaces of different heights.

[0042] In addition to the embodiments described above, the present invention also includes references Figure 3 The difference in Embodiment 3 is that, in order to further improve the efficiency of sediment entering the sand discharge channel 4, a pipe head is provided at the suspended end of the sand discharge pipe, and several impellers 6 are provided inside the pipe head (part of the impellers 6 are located at the outlet of the inner pipe 3, and part are located at the inlet of the sand discharge channel 4). In this way, high-pressure water is injected into the tank through the inner pipe 3, and the water flow drives the impellers 6 to rotate. After the high-pressure water passes through the impellers 6, it also has sufficient scouring force to impact the sand and silt deposited in the tank. At the same time, the impellers 6 carry the slurry (slurry containing sand and silt) into the sand discharge channel 4 and extract it out of the tank. Furthermore, a flared mouth 7 can be provided on the outer side of the end of the pipe head to expand the area of ​​the slurry inlet.

[0043] In addition to the above embodiments, the present invention also includes Embodiment Three, which differs in that an online sand cleaning method for tanks is applied to an online sand cleaning system for tanks, characterized in that the steps include:

[0044] Insert the end of the sand discharge pipe into the tank (adjust the height and position of the sand discharge pipe beforehand so that it is aligned with the center height of the manual gate valve at the sludge discharge port of the anaerobic tank).

[0045] High-pressure water is injected into the tank through the inner pipe 3, and the sand discharge channel 4 extracts the sediment from the tank to the solid-liquid separation device. When it is necessary to adjust the position of the end of the sand discharge pipe, the sand discharge pipe is extended into the tank or pulled out of the tank through the adjustment device 1. High-pressure water is introduced into one of the adjustment channels 8, and the high-pressure water is sprayed out from the outlet of the adjustment channel 8, causing the end of the sand discharge pipe to swing to the other side. The position of the end of the sand discharge pipe can be adjusted according to a certain pattern. For example, each time the length of the sand discharge pipe entering the tank is adjusted, the step of rotating the end of the sand discharge pipe to both sides is completed. This can further reduce the dead angle of sand cleaning in the tank and improve the sand cleaning efficiency and effect.

[0046] In summary, by spraying high-pressure water into the tank through the inner pipe 3, the sand and silt deposited in the tank are impacted, thereby improving the sand removal effect. In addition, the adjusting device 1 can adjust the position of the end of the sand discharge pipe inside the tank 1, thereby expanding the sand removal area and improving the sand removal efficiency and effect.

[0047] By introducing high-pressure water into an adjustment channel 8, the high-pressure water is discharged from the outlet of the adjustment channel 8, causing the end of the sand discharge pipe to be subjected to a force opposite to the direction of the high-pressure water discharge, thus turning the end of the sand discharge pipe and ensuring that sediment in all directions inside the tank is cleaned. In order to improve the sand cleaning efficiency, a bending sensor 5 is installed on one side of both adjustment channels 8. By measuring the length of the sand discharge pipe entering the tank and combining the bending degree of the sand discharge pipe detected by the bending sensor 5, the position of the end of the sand discharge pipe inside the tank can be calculated, thereby enabling precise control of the position of the end of the sand discharge pipe and efficient sand cleaning.

[0048] High-pressure water is injected into the tank through the inner pipe 3. The water flow drives the impeller 6 to rotate. After passing through the impeller 6, the high-pressure water has sufficient scouring force to impact the sand and silt deposited in the tank. At the same time, the impeller 6 carries the slurry and sand into the sand discharge channel 4 and extracts it outside the tank. A flared mouth 7 can be set on the outside of the pipe end to expand the area of ​​the slurry inlet.

[0049] The above are merely preferred embodiments of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and variations that are directly derived or conceived by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included within the protection scope of the present invention.

Claims

1. An online sand cleaning system for tanks, characterized in that, include: Solid-liquid separation device, sand discharge pipe and regulating device (1); The sand discharge pipe includes an outer pipe (2) and an inner pipe (3) inserted inside the outer pipe (2). The inner side of the outer pipe (2) and the outer side of the inner pipe (3) form a sand discharge channel (4). The sand discharge channel (4) is connected to the inlet of the solid-liquid separation device. One end of the inner pipe (3) is connected to a high-pressure water flow. The adjusting device (1) is used to extend the sand discharge pipe into the tank or pull it out of the tank. The sand discharge pipe is provided with two regulating channels (8), the outlets of the two regulating channels (8) are arranged opposite to each other on the suspension end ring side of the sand discharge pipe, and the two regulating channels (8) are connected to high pressure water flow. The suspended end of the sand discharge pipe is provided with a pipe head, and several impellers (6) are provided inside the pipe head. Part of the impellers (6) are located at the outlet of the inner pipe (3), and part of them are located at the inlet of the sand discharge channel (4). High-pressure water is injected into the tank through the inner pipe (3). The water flow drives the impellers (6) to rotate. After the high-pressure water passes through the impellers (6), it has sufficient scouring force to impact the sand and silt deposited in the tank. At the same time, the impellers (6) carry the slurry into the sand discharge channel (4), and then the slurry is extracted outside the tank.

2. The online sand cleaning system for tanks according to claim 1, characterized in that: A bending sensor (5) is provided on one side of each of the two adjustment channels (8).

3. The online sand cleaning system for tanks according to claim 1, characterized in that: A flared opening (7) is provided on the outer side of the end of the pipe head.

4. The online sand cleaning system for tanks according to claim 1, characterized in that: The adjustment device (1) includes a frame (11), a sliding seat (12) and a driving mechanism. The sliding seat (12) is slidably disposed on the frame (11), the sand discharge pipe is disposed on the sliding seat (12), and the driving mechanism is used to drive the sliding seat (12) to slide on the frame (11).

5. The online sand cleaning system for tanks according to claim 4, characterized in that: The driving mechanism includes a motor (13) and a lead screw (14). The lead screw (14) is rotatably mounted on the frame (11). The sliding seat (12) passes through the lead screw (14) and is threadedly connected to the lead screw (14). The motor (13) is mounted on the frame (11) and is used to drive the lead screw (14) to rotate.

6. The online sand cleaning system for tanks according to claim 4, characterized in that: The bottom of the frame (11) is provided with several pulleys (15).

7. The online sand cleaning system for tanks according to claim 5, characterized in that: The drive mechanism also includes a height adjustment rod (16), which is mounted on the frame (11). One end of the height adjustment rod (16) is connected to the sand discharge pipe and is used to adjust the horizontal height of the sand discharge pipe.

8. A method for online sand removal of a tank, applied to the online sand removal system for a tank as described in claim 2, characterized in that the steps include... include: Insert the end of the sand discharge pipe into the tank; The inner tube (3) injects high-pressure water into the tank, and the sand discharge channel (4) extracts the sediment in the tank to the solid-liquid separation device. When it is necessary to adjust the position of the end of the sand discharge pipe; The sand discharge pipe is extended into the tank or pulled out of the tank by adjusting the device (1); By introducing high-pressure water into one of the regulating channels (8), the high-pressure water jet is ejected from the outlet of the regulating channel (8), causing the end of the sand discharge pipe to swing to the other side.

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