Anti-clogging urea solution filtering circulation conveying system

Abstract

The invention discloses an anti-clogging urea solution filtering and circulating conveying system, relates to the technical field of urea solution filtering and circulating conveying, and is used to solve the problems that direct hydrolysis without filtering easily causes blockage of related connecting pipes, and at the same time, when the urea solution is conveyed, there is a lack of timely detection and analysis of the urea solution and automatic adjustment of the flow direction; the invention uses the centrifugal force generated by the rotation of a motor in a transmission cover to drive the sliding sleeve on the surface of the rotating shaft to move upward, and a push plate completes the pressing of stacked laminations on the surface of the filter cover, cooperates with the urea solution entering through a feed pipe to actively filter, and finally discharges the lamination tank through a discharge pipe on the top of the partition, so as to intercept impurities in the urea solution; at the same time, when cleaning is required, water is poured into a flushing pipe, and the speed of the rotating shaft is changed to rotate, so as to squeeze the laminations on the surface of the filter cover, discharge impurities in the gaps, and finally discharge the laminations from the filter tank through a sewage pipe, so as to complete the self-cleaning of the laminations.

Description

Technical Field

[0001] The invention relates to the technical field of urea solution filtering and circulating transportation, in particular to an anti-clogging urea solution filtering and circulating transportation system. Background Art

[0002] Urea, also known as carbon amide, is a colorless or white needle-shaped or rod-shaped crystal that can react with acid to form salt. Compared with the evaporation of ammonia water and liquid ammonia, the urea method of producing ammonia is safer. With the increasing requirements for safe operation, it has gradually replaced liquid ammonia as a reducing agent in the mature urban development areas.

[0003] The main equipment of the urea hydrolysis ammonia production system includes urea dissolving tank, urea solution storage tank, urea hydrolysis reactor, drain tank and pump delivery system, tank truck urea pneumatic delivery system and pneumatic feeding system, ammonia metering and distribution device, dilution air steam heat exchanger, ammonia / air mixer, etc. It is a complete set of product systems that can realize reliable urea hydrolysis and ammonia supply. In the early stage of ammonia preparation, urea granules need to be prepared into urea solution, and then the urea solution is prepared into ammonia through urea thermal decomposition (or hydrolysis) process. Granular urea is passed through a bucket elevator. Or the pneumatic conveying system is used to transport the urea to the urea dissolving tank, and after stirring, it is prepared into a urea solution with a concentration of about 40%-60%. After stirring and dissolving, the qualified urea solution at a temperature of about 60°C is injected into the urea solution storage tank by a dissolving liquid pump for storage, and the urea solution is transported to the hydrolyzer for decomposition by a urea solution pump. However, high-concentration urea aqueous solution and improper initial granulation of urea are easily heated to generate biuret and other condensation products that are difficult to dissolve in water. If they are directly pyrolyzed (or hydrolyzed) without filtering, it is easy to cause blockage of related connecting pipes;

[0004] At the same time, to avoid pipeline blockage, a lower mass concentration can be selected for the aqueous solution of urea, and then monitoring can be carried out before circulation. High-requirement heating pipes and heating devices (temperature must be controlled above 140°C) should be set around the ammonia pipeline and the hydrolysis reactor for operation management to avoid reverse reaction during ammonia circulation, which causes ammonia to be transported in the form of gas at high temperature, and then the temperature in the pipeline drops, resulting in crystallization and clogging of the pipeline, thereby affecting the subsequent transportation of urea solution in the pipeline and causing unstable hydrolysis of urea solution in the later stage.

[0005] Therefore, we propose an anti-clogging urea solution filtering and circulating delivery system. Summary of the invention

[0006] The object of the present invention is to provide a urea solution filtering and circulating conveying system that is anti-clogging, so as to solve the problems proposed in the above background technology that direct hydrolysis without filtration easily causes blockage of related connecting pipes, and at the same time, lacks timely detection and analysis of the urea solution and automatic adjustment of the flow direction when the urea solution is conveyed.

[0007] To achieve the above object, the present invention provides the following technical solutions: an anti-clogging urea solution filtering and circulating conveying system, comprising a filter tank, the side walls of the filter tank are respectively connected with a feed pipe and a discharge pipe from bottom to top, and one end of the feed pipe is connected with the urea solution tank, a sealing plate is movably connected in the feed pipe, a partition is fixed to the inner wall of the filter tank by spot welding, a filter cover is fixed to the inner wall of the filter tank and located on the partition by bolts, and the outer wall of the filter cover is evenly sleeved with laminations in sliding connection;

[0008] A transfer shell is installed on the discharge pipe, a liquid discharge pump is fixed to the top of the transfer shell by bolts, a liquid inlet pipe of the liquid discharge pump is connected to the transfer shell, one side of the liquid discharge pump is connected to liquid discharge pipe 1 and liquid discharge pipe 2, and solenoid valves are installed on liquid discharge pipe 1 and liquid discharge pipe 2, and a sleeve shell is fixed on the transfer shell and the liquid inlet pipe.

[0009] Furthermore, a transmission cover is fixed to the top of the filter tank by bolts, and a rotating shaft is movably connected to the bottom inner wall of the filter cover through a bearing, and one end of the rotating shaft passes through the filter cover and the partition respectively and is fixed to the output end of the motor in the transmission cover.

[0010] Furthermore, the rotating shaft is located in the filter cover and is sleeved and fixed with a rolling leaf fan. The outer wall of the rotating shaft is symmetrically and movably connected with a rotating rod through a bearing. A counterweight ball is fixed to the bottom end of the rotating rod by spot welding. A sliding sleeve is slidably connected on the rotating shaft and located on the top of the rotating rod. The outer wall of the sliding sleeve is symmetrically and rotatably connected with a rotating arm, and one end of the rotating arm is movably connected to one end of the rotating rod.

[0011] Furthermore, the outer wall of the sliding sleeve is movably connected with a sleeve plate, and a cross column is evenly fixed on the top of the sleeve plate by spot welding. The outer wall of the filter cover is slidably connected with a push plate, one end of the cross column penetrates the inner wall of the filter tank and is fixed to the bottom of the push plate, and the bottom of the stack is in contact with the push plate.

[0012] Furthermore, a sealed cavity is provided in the adapter shell, a ball plug is movably connected in the sealed cavity, a liquid hole is provided on the ball plug, a gear shaft 1 is movably connected to the inner wall of the sleeve shell, and one end of the gear shaft 1 passes through one side of the adapter shell and is fixed to the bottom of the ball plug.

[0013] Furthermore, a transmission cover 2 is installed in the casing, and the gear on the output end of the motor in the transmission cover 2 is meshed and connected with a gear shaft 1. A gear shaft 2 is installed on the bottom inner wall of the casing, and the gears at the end of the gear shaft 2 are meshed and connected with a gear shaft 1. One end of the gear shaft 2 passes through the feed pipe and is fixed to the sealing plate.

[0014] Furthermore, the outer wall of the filter tank is connected and fixed with a flushing pipe and a sewage pipe, and a control station is installed on the adapter shell, and the control station includes a urea signal acquisition unit, a hydrolysis analysis unit and a controller;

[0015] The urea signal acquisition unit is used for collecting comprehensive data of urea in the discharge pipe, wherein the comprehensive data of urea includes average urea flow rate data NS, average urea temperature difference data NC and average urea pressure difference data NY. The average urea flow rate data is the average value of urea flow rate in the discharge pipe per unit time, the average urea temperature difference data is the average value of temperature change of urea flowing through the discharge pipe per unit time, and the average urea pressure difference data NY is the average value of pressure change of urea solution in the discharge pipe per unit time.

[0016] The hydrolysis analysis unit is used to obtain and process comprehensive urea data. The specific processing method is as follows:

[0017] The average urea flow rate data NS, the average urea temperature difference data NC and the average urea pressure difference data NY within a unit time are obtained, and the urea solution control coefficient Y is obtained by using the formula, and is compared with the stored urea solution control coefficient threshold y to generate a control signal and send it to the controller;

[0018] The controller is used to obtain the control signal generated by the hydrolysis analysis unit and control the rotation of the motor in the transmission cover 2 to adjust the rotation angle of the gear shaft 1 and the gear shaft 2.

[0019] The anti-clogging urea solution filtering and circulating conveying method is as follows:

[0020] Start the motor located in the transmission cover 1 at the top of the filter tank, and the rotating shaft drives the rotating rod to rotate, so that the stacking group at the bottom of the push plate is squeezed and fitted, and then the discharge valve on the urea solution tank is opened, and the urea solution enters the filter tank through the feed pipe, seeps out from the cross columns to the outer wall of the stacking, and then emerges from the top of the partition after being filtered by the stacking and the filter cartridge, and finally comes to the side of the sealing chamber through the discharge pipe;

[0021] The urea flowing in the discharge pipe is tested by the inspection and control station in the adapter shell. When the temperature and purity meet the test standards, the gear shaft 1 is driven by the motor in the transmission cover 2 to rotate, so that the ball plug in the sealing chamber rotates, and then the ball plug is pumped into the outer metering and distributing device through the drainage pump. Finally, the urea solution is hydrolyzed with the 600℃ high-temperature flue gas.

[0022] When the urea flowing in the discharge pipe fails to pass the detection, the discharge pump, in coordination with the rotation of the ball plug, discharges the urea solution back into the urea solution tank.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the present invention, the motor in the transmission cover rotates to realize the rotation of the rotating rod on the rotating shaft, and the centrifugal force generated by the rotation drives the sliding sleeve on the surface of the rotating shaft to move upward, and the push plate completes the compression of the stacked laminations on the surface of the filter cover, and the urea solution entering through the feed pipe is actively filtered, and finally discharged from the filter tank through the discharge pipe on the top of the partition, so as to intercept the biuret and other condensation product impurities in the urea solution. At the same time, when cleaning is needed, the laminations on the surface of the filter cover are squeezed, and the impurities in the gap are discharged, and finally discharged from the filter tank through the sewage pipe, so as to complete the self-cleaning of the laminations and reuse them.

[0025] In the present invention, the flowing urea solution is monitored by the inspection and control station on the adapter shell. When there is a problem in the discharge detection of the urea solution, the gear shaft one and the gear shaft two in the casing are timely controlled to rotate, so as to realize the rotation of the ball plug in the sealing cavity, control the flow direction of the urea solution discharged from the discharge pipe, cooperate with the discharge pump to send the urea solution into the corresponding tank body, and continue to discharge after the subsequent detection is qualified, so as to ensure that the urea solution that meets the standard is hydrolyzed, realize the subsequent rapid hydrolysis reaction of the urea solution and the stable ammonia supply, and also avoid the urea solution from crystallizing on the inner wall of the pipeline due to temperature, pressure and flow rate, which affects the overall ammonia preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the anti-clogging urea solution filtering and circulating conveying system of the present invention;

[0027] Figure 2 This is a schematic diagram of the main cross-sectional structure of the filter tank of the present invention;

[0028] Figure 3 This is a schematic diagram of the stacking structure installed on the filter cover in the filter tank of the present invention;

[0029] Figure 4 It is a schematic diagram of the overall structure of the laminate of the present invention;

[0030] Figure 5 This is a schematic diagram of the connection structure between the first gear rod and the second gear rod in the housing of the present invention;

[0031] Figure 6 This is a schematic diagram of the rotation of the gear rod 1 and the gear rod 2 driving the ball plug and the sealing plate to rotate according to the present invention.

[0032] In the figure: 1. filter tank; 2. feed pipe; 3. transmission cover 1; 4. discharge pipe; 5. adapter shell; 6. drainage pump; 7. discharge pipe 1; 8. discharge pipe 2; 9. casing; 10. rotating shaft; 11. partition; 12. rotating rod; 13. counterweight ball; 14. sliding sleeve; 15. rotating arm; 16. sleeve; 17. cross column; 18. push plate; 19. filter cover; 20. rolling leaf fan; 21. lamination; 22. inspection and control table; 23. sealing chamber; 24. ball plug; 25. liquid hole; 26. transmission cover 2; 27. gear shaft 1; 28. gear shaft 2; 29. ​​sealing plate; 30. flushing pipe; 31. sewage pipe. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-6 , the present invention provides a technical solution:

[0035] Embodiment 1: The main equipment of the urea hydrolysis ammonia production system includes a urea dissolving tank, a urea solution storage tank, a urea hydrolysis reactor, a drain tank and a pump delivery system, a tank truck urea pneumatic delivery system and a pneumatic feeding system, an ammonia metering and distribution device, a dilution air steam heat exchanger, an ammonia / air mixer, etc. After the solid urea is dissolved, it is moved to the urea solution tank for storage through a delivery pump. When it is needed, the urea solution is moved to the metering and distribution device through a delivery circulation device, and the urea is hydrolyzed in the hydrolysis reactor with hot air to generate ammonia and air mixed gas. Considering that a high-concentration urea aqueous solution is easily heated to generate biuret and other condensation products that are insoluble in water, urea needs to be filtered before dissolving to avoid pipeline blockage during the subsequent urea solution flow, which affects the overall hydrolysis efficiency. For this reason, the circulating delivery device needs to complete the filtering and self-cleaning operations when transmitting the urea solution to ensure stable urea transmission;

[0036] Usually the urea solution filtering and circulating conveying device is installed on one side of the urea solution tank, such as Figure 1 As shown, the feed pipe 2 on the filter tank 1 is connected to the urea solution tank, and a sealing plate 29 is rotatably connected inside the entire feed pipe 2 to intercept the inflow of urea solution;

[0037] When the urea solution enters the filter tank 1, a cross column 17 is installed on the sleeve plate 16 that is movably connected to the surface of the rotating shaft 10. Figure 2As shown, the top side of the cross column 17 is a cylinder, and the bottom side is a cross plate, so when the cylindrical side of the cross column 17 abuts against the inner wall of the filter tank 1, the urea solution cannot flow out normally, and when the cross plate side of the cross column 17 contacts the holes on the inner wall of the filter tank 1, the urea solution can come to the filter cover 19 side for filtering;

[0038] A transmission cover 3 is installed on the top of the entire filter tank 1, and a rotating shaft 10 is installed at the output end of the motor in the transmission cover 3. The rotating shaft 10 is located at the bottom end of the filter tank 1 and is movably connected to a rotating rod 12. The rotating rod 12 body is divided into two sides, and a counterweight ball 13 is fixed to the end of the bottom rod body, and the end of the top rod body is movably connected to a rotating arm 15, and the entire rotating arm 15 is located on a sliding sleeve 14, and the sliding sleeve 14 is located on the rotating shaft 10 and is slidably connected to the rotating shaft 10. Therefore, the sliding sleeve 14 can be moved up and down by rotating the rotating shaft 10. Specifically, when the rotating shaft 10 rotates, the rotating rod 12 is unfolded, thereby pushing the rotating arm 15 and the sliding sleeve 14 connected to the rotating arm 15 to move upward, and the sleeve plate 16 is located on the sliding sleeve 14 and is movably connected, but the cross column 17 fixed on the sliding sleeve 14 is clamped with the inner wall of the filter tank 1, so it is not affected by the rotation of the rotating shaft 10, but will move up and down with the sliding sleeve 14, thereby completing the upper and lower sides of the inner wall of the filter tank 1. Connectivity adjustment;

[0039] After the rotating shaft 10 rotates, the urea solution enters the middle of the filter tank 1, as shown in FIG. Figure 3 As shown, a plurality of laminates 21 are evenly sleeved and fixed on the periphery of the filter cover 19 installed on the inner wall of the filter tank 1 and the partition 11, as shown in FIG. Figure 4 As shown, two adjacent sleeved laminations 21 are placed in opposite directions, and the outer and inner circles of the laminations 21 are provided with cutouts, that is, after the two laminations 21 are stacked, a gap is left between the outer and inner sides, and the surface of the laminations 21 is frosted, and multiple groups of laminations 21 are squeezed and locked, so that the incoming urea solution can be filtered and some impurities can be intercepted between the laminations 21;

[0040] For this reason, when the entire rotating shaft 10 rotates, the lifted sleeve plate 16 pushes the push plate 18 on the outer wall of the filter cover 19 through the cross column 17, and the push plate 18 pushes the multiple groups of laminated sheets 21 to be squeezed and fitted on the periphery of the filter cover 19 to form a filter layer, and the urea solution flowing through is initially filtered. Secondly, the entire filter cover 19 can perform secondary filtration of the urea solution. At the same time, a rolling leaf fan 20 is fixedly mounted on the surface of the rotating shaft 10 located in the filter cover 19. The rotating rolling leaf fan 20 drives the liquid to flow upward quickly, thereby improving the filtration efficiency of the urea solution. When the laminated sheets 21 need to be self-cleaned, the rotating shaft 10 stops rotating. The push plate 18 is moved, and the stacking sheet 21 is no longer squeezed. The gap between the stacking sheets 21 is reduced and becomes loose. The feed pipe 2 and the discharge pipe 4 of the filter tank 1 are closed, and clean water is discharged from the flushing pipe 30. Clean water continuously flows in and immerses the stacking sheets 21. After soaking for a period of time, the transmission cover 3 is used to drive the rotating shaft 10 to rotate at a variable speed. The stacking sheets 21 are repeatedly pressed by the push plate 18 to discharge impurities in the gaps. The stacking sheets 21 are accompanied by clean water to the bottom of the filter tank 1 and are finally discharged along the drain pipe 31, completing the self-cleaning of the stacking sheet 21 assembly in the entire filter tank 1. There is no need to replace the filter components, and it is easy to use.

[0041] Embodiment 2: The rising urea solution finally enters the discharge pipe 4 through the partition 11, and is then extracted by the discharge pump 6 and discharged from the discharge pipe 7 into the external metering and sorting device. However, considering whether the discharged urea solution is qualified, it is necessary to perform a test;

[0042] A transfer shell 5 is installed on the discharge pipe 4, and a control station 22 is installed on the transfer shell 5. The control station 22 includes a urea signal acquisition unit, a hydrolysis analysis unit and a controller;

[0043] The urea signal acquisition unit is used for collecting comprehensive data of urea in the discharge pipe 4, wherein the comprehensive data of urea includes average urea flow rate data NS, average urea temperature difference data NC and average urea pressure difference data NY, the average urea flow rate data is the average value of the urea flow rate in the discharge pipe 4 per unit time, the average urea temperature difference data is the average value of the temperature change of urea flowing through the discharge pipe 4 per unit time, and the average urea pressure difference data NY is the average value of the pressure change of the urea solution in the discharge pipe 4 per unit time;

[0044] The hydrolysis analysis unit is used to obtain and process comprehensive urea data. The specific processing method is as follows:

[0045] Obtaining the average urea flow rate data NS, the average urea temperature difference data NC and the average urea pressure difference data NY per unit time;

[0046] Using the formula The urea solution control coefficient Y is obtained by processing, where d1, d2 and d3 are correction factors, and d1+d2+d3=1.542, and is compared with the stored urea solution control coefficient interval threshold y:

[0047] When Y≥ymax, a urea solution detection pass signal is generated;

[0048] When ymin<Y<ymax, a urea solution detection failure signal is generated;

[0049] When Y≤ymin, a cleaning signal is generated;

[0050] When the controller receives the relevant transmission signal, it performs corresponding control, such as Figure 5 As shown, a sleeve 9 is installed on the adapter shell 5 and the feed pipe 2, and a transmission cover 26 is installed in the sleeve 9. Secondly, a ball plug 24 is movably connected in the sealed cavity 23 in the adapter shell 5. The ball plug 24 is located on the horizontal side and has a liquid hole 25, as shown in FIG. Figure 6 As shown, the gear shaft 1 27 installed in the sleeve 9 is connected to the ball plug 24, and cooperates with the transmission cover 26 to drive the gear shaft 1 27 to rotate, thereby completing the rotation of the entire ball plug 24 in the sealing chamber 23;

[0051] A gear shaft 28 is also installed in the casing 9. The gear on the gear shaft 28 is meshed with the gear on the gear shaft 1 27. The gear shaft 1 27 rotates one circle while the gear shaft 28 rotates half a circle. The other end of the gear shaft 28 is connected to the sealing plate 29 in the feed pipe 2. Therefore, after the motor in the transmission cover 26 rotates, the gear shaft 1 27 and the gear shaft 2 28 rotate simultaneously. Figure 6 As shown, after the controller receives the urea solution detection pass signal, the A port of the ball plug 24 is connected to the discharge pipe 4, and the urea solution flows along the A port to the C port, and then the urea solution is directly discharged from the discharge pipe 8 into the metering and dispensing device through the discharge pump 6, while the sealing plate 29 does not seal the feed pipe 2, and the liquid flows normally;

[0052] When the control receives the signal that the urea solution test fails, the motor in the transmission cover 26 drives the ball plug 24 to rotate 90° clockwise, so that the urea solution flowing into the port A is discharged from the port B, and the urea solution is discharged from the outlet pipe 1 7 back to the urea solution tank through the drainage pump 6. After temperature adjustment and relevant concentration detection, the urea solution parameters are fed back to the front urea dissolving tank for linkage adjustment. Similarly, the entire sealing plate 29 does not seal the feed pipe 2.

[0053] When a cleaning signal is generated, it means that the urea solution delivery needs to be stopped, and the urea solution cannot flow into the A port. At the same time, the sealing plate 29 located in the feed pipe 2 is closed. At this time, the filter tank 1 is in an independent space and starts to be automatically cleaned. The flushing pipe 30 located on the filter tank 1 starts to take in liquid, and the sewage generated by the cleaning is discharged from the drain pipe 31. After the overall cleaning of the filter tank 1 is completed, the liquid is passed again to ensure that the subsequent urea solution hydrolysis is stable and efficient.

[0054] The working principle of the present invention is as follows: the motor in the transmission cover 3 at the top of the filter tank 1 is started, and the rotating shaft 10 drives the rotating rod 12 to rotate, and at the same time, the stacking sheets 21 at the bottom of the push plate 18 are squeezed and fitted, and then the discharge valve on the urea solution tank is opened, and the urea solution enters the filter tank 1 along the feed pipe 2, seeps out from the cross column 17 to the outer wall of the stacking sheets 21, and then emerges from the top of the partition 11 after being filtered by the stacking sheets 21 and the filter cartridge, and finally comes to the side of the sealing chamber 23 along the discharge pipe 4;

[0055] The urea flowing in the discharge pipe 4 is tested by the inspection and control station 22 in the adapter shell 5. When the temperature and purity reach the test standard, the gear shaft 1 27 is driven by the motor in the transmission cover 2 26 to rotate, so that the ball plug 24 in the sealing chamber 23 rotates, and then the urea is pumped into the outer metering and distributing device through the drainage pump 6. Finally, the urea solution is hydrolyzed with the 600°C high-temperature flue gas.

[0056] When the urea flowing in the discharge pipe 4 fails to pass the detection, the discharge pump 6 discharges the urea solution back to the urea solution tank in coordination with the rotation of the ball plug 24. The present invention takes into account the corrosiveness of the urea solution and mainly prevents it from two aspects: the selection of pipeline and equipment materials and the process design. The main parts are made of urea grade 316L and 25-22-2 materials, which have good corrosion resistance.

[0057] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A urea solution filtering and circulating conveying device with anti-clogging, comprising a filter tank (1), wherein the side walls of the filter tank (1) are respectively connected with a feed pipe (2) and a discharge pipe (4) from bottom to top, and one end of the feed pipe (2) is connected with a urea solution tank, and a sealing plate (29) is movably connected inside the feed pipe (2), characterized in that: The inner wall of the filter tank (1) is fixed with a partition (11) by spot welding, the inner wall of the filter tank (1) is fixed with a filter barrel by bolts below the partition (11), and the outer wall of the filter barrel is evenly sleeved with laminated sheets (21) in sliding connection; The discharge pipe (4) is provided with an adapter shell (5), a liquid discharge pump (6) is fixed to the top of the adapter shell (5) by bolts, a liquid inlet pipe of the liquid discharge pump (6) is connected to the adapter shell (5), one side of the liquid discharge pump (6) is connected to a liquid discharge pipe 1 (7) and a liquid discharge pipe 2 (8), and a solenoid valve is installed on the liquid discharge pipe 1 (7) and the liquid discharge pipe 2 (8), and a sleeve shell (9) is fixedly mounted on the adapter shell (5) and the liquid inlet pipe; The top of the filter tank (1) is fixed with a transmission cover (3) by bolts, and the bottom inner wall of the filter barrel is movably connected with a rotating shaft (10) by a bearing, and one end of the rotating shaft (10) passes through the filter barrel and the partition (11) respectively and is fixed to the output end of the motor in the transmission cover (3); The rotating shaft (10) is located in the filter barrel and is sleeved and fixed with a rolling leaf fan (20); the outer wall of the rotating shaft (10) is symmetrically and movably connected to a rotating rod (12) via a bearing; a counterweight ball (13) is fixed to one end of the bottom of the rotating rod (12) via spot welding; a sliding sleeve (14) is sleeved and slidably connected to the rotating shaft (10) and located at the top of the rotating rod (12); the outer wall of the sliding sleeve (14) is symmetrically and rotatably connected to a rotating arm (15); one end of the rotating arm (15) is movably connected to one end of the rotating rod (12); The outer wall of the sliding sleeve (14) is sleeved with a sleeve plate (16) in movable connection, the top of the sleeve plate (16) is evenly fixed with a cross column (17) by spot welding, the outer wall of the filter barrel is sleeved with a push plate (18) in sliding connection, one end of the cross column (17) penetrates the inner wall of the filter tank (1) and is fixed to the bottom of the push plate (18), and the bottom of the laminate (21) is in contact with the push plate (18).

2. The anti-clogging urea solution filtering circulation conveying device according to claim 1, characterized in that: A sealed cavity (23) is provided in the adapter shell (5), a ball plug (24) is movably connected in the sealed cavity (23), a liquid through hole (25) is provided on the ball plug (24), a gear shaft 1 (27) is movably connected to the inner wall of the sleeve shell (9), and one end of the gear shaft 1 (27) passes through one side of the adapter shell (5) and is fixed to the bottom of the ball plug (24).

3. The anti-clogging urea solution filtering circulation conveying device according to claim 2, characterized in that: A transmission cover 2 (26) is installed in the casing (9), and a gear on the output end of the motor in the transmission cover 2 (26) is meshedly connected with a gear shaft 1 (27). A gear shaft 2 (28) is installed on the inner wall of the bottom of the casing (9), and a gear at the end of the gear shaft 2 (28) is meshedly connected with the gear shaft 1 (27). One end of the gear shaft 2 (28) passes through the feed pipe (2) and is fixed to the sealing plate (29).

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