Online backwashing deslagging filter

Abstract

The utility model belongs to the technical field of filtering equipment, and particularly relates to an on-line backwashing deslagging filter which comprises a three-way pipe and a filtering device, the filtering device comprises a filtering cylinder and a filtering core, one side of the filtering cylinder is provided with a slag washing water inlet, the bottom end of the filtering cylinder is provided with a deslagging port, the filtering core is arranged in the filtering cylinder, and the filtering core is provided with a slag washing water outlet. A slag flushing water outlet is formed in the upper part of the filter element and extends to the upper end of the filter cartridge; the two ends of the three-way pipe are respectively connected with the slag flushing water outlets of the filtering devices. The filter is simple and novel in design, low in investment cost, capable of effectively intercepting and filtering large-particle scaling matters and suspended matters entrained in water, simple and convenient to maintain and capable of prolonging the operation cycle of the device.

Description

Technical Field

[0001] The utility model belongs to the technical field of filtering equipment, in particular to an online backwashing slag-discharging filter. Background Technique

[0002] In the production of large-scale dihydrate wet-process phosphoric acid, the rotary table filter is the core equipment in the extraction process. The filter cloth of the filter is regenerated by the pressurized flushing water sprayed by the nozzle to wash away the phosphogypsum that has not been completely discharged by the slag-discharging spiral on the filter cloth, so as to realize the regeneration of the filter cloth and restore the filtering function of the filter cloth. Generally, the flushing water for the filter cloth uses the return water or circulating water, or the washing water of the extraction low-level flash cooling system. The washing water contains a certain amount of potassium and sodium salts, phosphogypsum, fluorosilicic acid, etc., and the water quality is poor. Long-term use will form a hard water scale on the surface of the pipeline or equipment. Under the action of thermal expansion and contraction and scouring, the water scale will fall off and directly block the filter element of the main pipe of the flushing water for the flushing tray and the nozzle of the flushing tray of the filter, resulting in the unclean flushing of the filter cloth of the filter, affecting the regeneration effect of the filter cloth, and causing phosphorus loss due to mixing trays.

[0003] To achieve "zero discharge" of the wastewater containing phosphorus elements, it is inevitable that the flushing water for the flushing tray cannot use the primary process water, but the return water or circulating water, or the washing water of the extraction low-level flash cooling system.

[0004] (1) The pipeline filter is arranged between the flushing tray water tank and the flushing tray water pump. The filter element of the main pipe of the flushing water for the flushing tray is severely blocked, and the circular filter cylinder of the Y-type filter is often sucked flat and fails. It is necessary to frequently stop the filter to clean the filter element. To clean the filter element, it is necessary to stop the flushing tray water pump and the filter must be stopped.

[0005] (2) For the flushing tray water pipe of the rotary table filter, there are many pipelines in the whole pipeline, mainly including the main horizontal pipe and several branch pipes. Each branch pipe is welded to the horizontal pipe. Once the nozzle is blocked, not only the filter needs to be stopped for dredging, but also the entire main horizontal pipe several meters long needs to be lifted up. After the cleaning is completed, it needs to be reinstalled as a whole. The time required for dredging is not long, but the disassembly and installation time is long, the filter stop time is long, and the production time is shortened.

[0006] (3) After the spray pipe and nozzle are blocked, it is necessary to frequently stop the machine to clean the nozzle. During the disassembly and installation process of the spray pipe, it is easy to cause deformation, damage to the nozzle, unevenness of the spray pipe, affecting the installation height of the spray pipe and the angle of the flushing tray, resulting in unclean flushing of the filter cloth, and inevitable scaling on the surface of the filter cloth, directly affecting the phosphorus recovery rate and the productivity of the filter.

[0007] In short, when the entire flushing water system is abnormal, it is necessary to stop the filter to handle it, resulting in an increase in the number of unplanned stops and a reduction in the effective operation time. Therefore, the research direction is not only to solve the above problems from the perspective of equipment, but more importantly, when some problems are inevitable, to think about solving the problems of the flushing water for the filter of the filter online. Content of the Utility Model

[0008] In view of the technical problems existing in the background technology, the utility model provides an online backwashing and slag removal filter, specifically relates to the primary filtration of the flushing water of the wet phosphoric acid extraction filter, which is mainly used for intercepting and filtering large particles of scaling and suspended matter in the water, backwashing and slag removal, and does not require manual disassembly and cleaning.

[0009] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0010] An online backwashing slag discharge filter comprises a three-way pipe and a filtering device, wherein the filtering device comprises a filter cartridge and a filter element, a slag flushing water inlet is arranged on one side of the filter cartridge, a slag discharge port is arranged at the bottom end of the filter cartridge, a filter element is arranged inside the filter cartridge, a slag flushing water outlet is arranged on the upper part of the filter element, and the slag flushing water outlet extends to the upper end of the filter cartridge; two filtering devices are arranged, and both ends of the three-way pipe are respectively connected to the slag flushing water outlets of the filtering devices.

[0011] Optionally, the three-way pipe is configured as an inverted Y-shape, and outlet valve one, outlet valve two and a main outlet valve are respectively provided on the three branches of the three-way pipe.

[0012] Optionally, the slag flushing water inlet of one filter cartridge is connected to a first slag flushing water pipe, and the first slag flushing water pipe is provided with an inlet valve 1; the slag flushing water inlet of the other filter cartridge is connected to a second slag flushing water pipe, and the second slag flushing water pipe is provided with an inlet valve 2.

[0013] Optionally, a first slag discharge pipe is connected to the slag discharge port of one filter cartridge, and a slag discharge valve 1 is provided on the first slag discharge pipe; a second slag discharge pipe is connected to the slag discharge port of another filter cartridge, and a slag discharge valve 2 is provided on the second slag discharge pipe.

[0014] Optionally, the slag flushing water inlet is arranged tangent to the outer wall of the filter cartridge, so that water can flow in along the tangential direction to reach the inner wall of the filter cartridge.

[0015] Optionally, the filter element includes an upper cover and a first filter element integrally connected to the upper cover, a top cover is provided at the upper end of the filter cartridge, the bottom end of the upper cover is fixedly connected to the top cover, the upper end of the upper cover has a slag flushing water outlet, and the slag flushing water outlet is connected to a three-way pipe.

[0016] Optionally, the filter element includes an upper cover, a second filter element and a third filter element. A top cover is provided at the upper end of the filter cartridge, and a slag flushing water outlet is provided at the upper end of the upper cover, and the slag flushing water outlet is connected to a three-way pipe; a receiving ring is provided at the upper end of the second filter element, and the receiving ring is provided on the upper end surface of the top cover. The third filter element is telescopically arranged inside the second filter element, and the bottom end of the upper cover is arranged close to the receiving ring.

[0017] Optionally, a limiting ring is provided on the inner wall of the bottom end of the second filter element, a sliding cylinder is provided at the upper end of the third filter element, the sliding cylinder slides closely along the inner wall of the second filter element, and the bottom end of the sliding cylinder can rest on the limiting ring.

[0018] Optionally, a number of limiting bumps are evenly distributed on the inner wall circumference of the upper end of the second filter element, and a number of avoiding grooves for cooperating with the limiting bumps are evenly distributed on the outer wall circumference of the sliding cylinder; an annular support is provided on the inner wall of the second filter element, and a number of limiting rods are evenly distributed on the circumferences of the upper and lower ends of the support respectively. The limiting rods at the lower end of the support are closely arranged against the upper end surface of the sliding cylinder, and the limiting rods at the upper end of the support are closely arranged against the bottom wall of the limiting bumps.

[0019] Optionally, two connecting holes are symmetrically provided on the limiting bumps, and limiting screws are provided in the connecting holes.

[0020] The utility model has the following advantages and beneficial effects:

[0021] This filter has a simple and novel design, low investment cost, can effectively intercept and filter large particle scale deposits and suspended solids entrained in water, is easy to maintain, and extends the operation cycle of the device.

[0022] (1) After the transformation of the flushing water system, the scale deposits and suspended solids in the system are fully intercepted. The filters are arranged in one-open-one-standby mode, completely solving the problem of frequent blockage of the flushing water system of the filter machine.

[0023] (2) Solving the problem of frequent shutdown of the filter machine caused by the blockage of the flushing water system.

[0024] (3) Because the filter realizes backwashing and automatic slag discharge, there is no need for manual disassembly and assembly, reducing the cleaning intensity and cleaning risk of employees.

[0025] (4) Due to the significant improvement in the filtration intensity and operation rate, the slag washing water after filtration by the filter flushes away the phosphogypsum that is not completely discharged by the slag discharge spiral on the filter cloth, realizing the regeneration of the filter cloth, promoting the production capacity of the device. Due to the good regeneration effect of the filter cloth, the phosphorus recovery rate is increased and the phosphorus loss is reduced. Description of the Drawings

[0026] Figure 1 It is the installation structure diagram of the on-line backwashing slag discharge filter provided by the utility model;

[0027] Figure 2 It is the structure diagram of the filtering device provided by the utility model;

[0028] Figure 3 It is the cross-sectional view of the first filter element structure of the filtering device provided by the utility model;

[0029] Figure 4One of the sectional views of the second filter element structure of the filtering device provided by the present utility model;

[0030] Figure 5 Another sectional view of the second filter element structure of the filtering device provided by the present utility model;

[0031] Figure 6 For Figure 5 The partial enlarged view at position a in

[0032] Figure 7 The structural diagram of the second filter element structure of the filtering device provided by the present utility model;

[0033] Figure 8 For Figure 7 The half sectional view of

[0034] Figure 9 The structural diagram of the second filter element provided by the present utility model;

[0035] Figure 10 The structural diagram of the third filter element provided by the present utility model;

[0036] Figure 11 The structural diagram of the bracket provided by the present utility model;

[0037] Icon: 1 - tee, 11 - outlet valve one, 12 - outlet valve two, 13 - total outlet valve, 2 - filter element, 2a - filter element one, 2b - filter element two, 21 - upper cover, 211 - slag flushing water outlet, 22 - first filter element, 23 - second filter element, 231 - limiting convex block, 232 - connecting hole, 233 - receiving ring, 234 - limiting ring, 235 - mounting hole, 24 - third filter element, 241 - sliding cylinder, 242 - avoiding groove, 25 - bracket, 251 - connecting rod, 252 - limiting rod, 3 - filter cylinder, 3a - filter cylinder one, 3b - filter cylinder two, 31 - slag flushing water inlet, 32 - slag discharge port, 33 - top cover, 4 - first slag flushing water pipe, 41 - inlet valve one, 5 - second slag flushing water pipe, 51 - inlet valve two, 6 - slag discharge valve one, 61 - first slag discharge pipe, 7 - slag discharge valve two, 71 - second slag discharge pipe. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model.

[0039] Accordingly, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0040] Embodiment 1

[0041] As Figures 1 to 3 shown, an on-line backwashing slag-discharging filter includes a tee 1 and a filtering device. The filtering device includes a filter cartridge 3 and a filter element 2. A slag flushing water inlet 31 is provided on one side of the filter cartridge 3, a slag discharging port 32 is provided at the bottom end of the filter cartridge 3, a filter element 2 is arranged inside the filter cartridge 3, and a slag flushing water outlet 211 is provided at the upper part of the filter element 2, and the slag flushing water outlet 211 extends to the upper end of the filter cartridge 3; there are two filtering devices, and both ends of the tee 1 are respectively connected to the slag flushing water outlets 211 of the filtering devices.

[0042] In the present utility model, there are two filter cartridges 3 arranged left and right, namely filter cartridge one 3a and filter cartridge two 3b. Similarly, there are two filter elements 2 arranged left and right, namely filter element one 2a and filter element two 2b. Filter element one 2a is arranged inside filter cartridge one 3a, and filter element two 2b is arranged inside filter cartridge two 3b. The structures of filter element one 2a and filter element two 2b are the same, and the structures of filter cartridge one 3a and filter cartridge two 3b are the same.

[0043] Furthermore, the tee 1 is arranged in an inverted Y shape, and an outlet valve one 11, an outlet valve two 12 and a main outlet valve 13 are respectively arranged on the three branches of the tee 1. The branch of the tee 1 where the outlet valve one 11 is located is connected to the filter element one 2a, and the branch of the tee 1 where the outlet valve two 12 is located is connected to the filter element two 2b.

[0044] Furthermore, a first slag flushing water pipe 4 is connected to the slag flushing water inlet 31 of one of the filter cartridges 3 (i.e., filter cartridge one 3a), and an inlet valve one 41 is arranged on the first slag flushing water pipe 4; a second slag flushing water pipe 5 is connected to the slag flushing water inlet 31 of the other filter cartridge 3 (i.e., filter cartridge two 3b), and an inlet valve two 51 is arranged on the second slag flushing water pipe 5.

[0045] Furthermore, a first slag discharging pipe 61 is connected to the slag discharging port 32 of one of the filter cartridges 3 (i.e., filter cartridge one 3a), and a slag discharging valve one 6 is arranged on the first slag discharging pipe 61; a second slag discharging pipe 71 is connected to the slag discharging port 32 of the other filter cartridge 3 (i.e., filter cartridge two 3b), and a slag discharging valve two 7 is arranged on the second slag discharging pipe 71.

[0046] Two filtering devices are installed in parallel. Anti-corrosion pressure gauges are installed at the pump outlet, outlet valve 11, and outlet valve 12 respectively to detect the pressure of each filtering device. When the pressure of one of the filtering devices increases (i.e., the filter element 2 is blocked), backwashing can be carried out through the other filtering device.

[0047] As a preferred embodiment of the present utility model, the slag flushing water inlet 31 is tangentially arranged with the outer wall of the filter cartridge 3, so that the water can enter along the tangent direction to reach the inner wall of the filter cartridge 3. The filter adopts the tangential water inlet method. Under the action of centrifugal force, the scale deposits along the inner wall of the filter cartridge 3 to the conical bottom. By opening the slag discharge valve at the bottom, the slag at the conical bottom can be discharged, and at the same time, there is enough slag storage space.

[0048] Filtration principle: The slag flushing water enters from the filter inlet valve. The particulate matter therein sinks along the inner wall of the filter cartridge 3 under the action of the tangential force to the conical hopper. The large-particle materials are filtered by the filter element 2. The diameter of the small-particle materials is smaller than the diameter of the nozzle, so it will not block the nozzle. After the filter operates for a period of time, the filter screen of the filter is partially blocked and the pressure difference increases. When the pressure difference reaches a certain value, it switches to the other unit for operation.

[0049] Rinsing and regeneration operation: Taking the regeneration of filter cartridge 3a and filter element 2a as an example, first, it is necessary to ensure that filter cartridge 3b and filter element 2b are in normal working state. Inlet valve 41 is closed, slag discharge valve 6 and outlet valve 11 are opened, and the total outlet valve 13 is closed. After running for 3 - 5 s, the backwashing of the screen surface of filter element 2a is completed; then the total outlet valve 13 is opened first, and then outlet valve 11 is closed to switch to the normal working state.

[0050] This filter is simple and novel in design, with low investment cost. It can effectively intercept and filter large-particle scale deposits and suspended matters entrained in water, is easy to maintain, and extends the operation cycle of the device.

[0051] (1) After the transformation of the slag flushing water system, the scale deposits and suspended matters in the system are fully intercepted. One filter is in use and the other is in standby, completely solving the problem of frequent blockage of the filter machine slag flushing water system.

[0052] (2) Solve the problem of frequent shutdown of the filter machine caused by blockage of the slag flushing water system.

[0053] (3) Because the filter realizes backwashing and automatic slag discharge, there is no need for manual disassembly and assembly, reducing the cleaning intensity and cleaning risk of employees.

[0054] (4) Due to the significant improvement in filtration intensity and operation rate, the slag flushing water after filtration by the filter flushes away the phosphogypsum that is not completely discharged by the slag discharge screw on the filter cloth, realizing the regeneration of the filter cloth, promoting the production capacity of the device. Due to the good regeneration effect of the filter cloth, the phosphorus recovery rate is increased and the phosphorus loss is reduced.

[0055] Embodiment 2

[0056] As Figures 1 to 3 shown, the filter element 2 includes an upper cover 21 and a first filter element 22 integrally connected to the upper cover 21. A top cover 33 is provided at the upper end of the filter cartridge 3. The bottom end of the upper cover 21 is connected and fixed to the top cover 33. The upper end of the upper cover 21 has a slag flushing water outlet 211, and the slag flushing water outlet 211 is connected to the three-way pipe 1. The integrated filter element 2 has a more compact overall structure.

[0057] Embodiment 3

[0058] As Figures 4 to 11 shown, the filter element 2 includes an upper cover 21, a second filter element 23 and a third filter element 24. A top cover 33 is provided at the upper end of the filter cartridge 3. The upper end of the upper cover 21 has a slag flushing water outlet 211, and the slag flushing water outlet 211 is connected to the three-way pipe 1. A receiving ring 233 is provided at the upper end of the second filter element 23. A plurality of mounting holes 235 are provided around the circumference of the receiving ring 233. The receiving ring 233 is arranged on the upper end surface of the top cover 33. The third filter element 24 is telescopically arranged inside the second filter element 23, that is, the third filter element 24 can extend to the bottom of the second filter element 23 or can be received inside the second filter element 23. The bottom end of the upper cover 21 is closely attached to the receiving ring 233, so that the upper cover 21, the top cover 33 and the receiving ring 233 can be connected and fixed by bolts or the like. With such a design, the structure of the filter element 2 is detachable. The upper cover 21 and the filter element structure at the bottom side can be disassembled and assembled. Therefore, when replacing the filter element structure, only the upper cover 21 needs to be removed, and there is also space to replace the filter element structure without disassembling the three-way pipe 1. Then, the second filter element 23 and the third filter element 24 can be taken out separately or integrally, and the disassembly and assembly are convenient and fast.

[0059] Furthermore, a limiting ring 234 is provided on the inner wall of the bottom end of the second filter element 23, and a sliding cylinder 241 is provided at the upper end of the third filter element 24. The sliding cylinder 241 slides closely along the inner wall of the second filter element 23, and the bottom end of the sliding cylinder 241 can be received on the limiting ring 234.

[0060] Further, a plurality of limiting bumps 231 are evenly distributed on the inner wall circumference of the upper end of the second filter element 23, and a plurality of avoidance grooves 242 that cooperate with the limiting bumps 231 are evenly distributed on the outer wall circumference of the sliding cylinder 241. When installing the third filter element 24, it is only necessary to align the limiting bumps 231 with the avoidance grooves 242, and then the third filter element 24 can be placed into the second filter element 23. An annular bracket 25 is provided on the inner wall of the second filter element 23. The brackets 25 are connected by a plurality of connecting rods 251. A plurality of limiting rods 252 are evenly distributed on the circumferences of the upper and lower ends of the bracket 25 respectively. The number of the limiting rods 252 is the same as that of the limiting bumps 231. The limiting rods 252 at the lower end of the bracket 25 are arranged close to the upper end surface of the sliding cylinder 241, and the limiting rods 252 at the upper end of the bracket 25 are arranged close to the bottom wall of the limiting bumps 231. When the third filter element 24 is placed into the second filter element 23 and the third filter element 24 is located at the bottommost position, the bracket 25 is placed into the second filter element 23, and then the bracket 25 is rotated so that the limiting rods 252 rotate to the bottom ends of the limiting bumps 231, thus stably fixing and connecting the third filter element 24 and the second filter element 23 through the bracket 25.

[0061] Further, two connection holes 232 are symmetrically arranged on the limiting bump 231, and a limiting screw is arranged in the connection hole 232. After the limiting screw is screwed into the connection hole 232, the limiting rod 252 is located between the two limiting screws on the two connection holes 232, thereby realizing the limitation, preventing the bracket 25 from rotating, and preventing the bracket 25 from detaching from the second filter cylinder 3.

[0062] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An online backwashing slag discharge filter, characterized in that : It includes a tee and a filtering device. The filtering device includes a filter cartridge and a filter element. One side of the filter cartridge is provided with a slag flushing water inlet, the bottom end of the filter cartridge is provided with a slag discharge port, a filter element is arranged inside the filter cartridge, and the upper part of the filter element has a slag flushing water outlet which extends to the upper end of the filter cartridge; There are two filtering devices, and both ends of the tee are respectively connected to the slag flushing water outlets of the filtering devices.

2. The online backwashing slag discharge filter according to claim 1, characterized in that: The tee is arranged in an inverted Y shape, and an outlet valve one, an outlet valve two and a main outlet valve are respectively arranged on the three branches of the tee.

3. The on-line backwashing slag-discharging filter according to claim 2, wherein: A first slag flushing water pipe is connected to the slag flushing water inlet of one of the filter cartridges, and an inlet valve one is arranged on the first slag flushing water pipe; A second slag flushing water pipe is connected to the slag flushing water inlet of the other filter cartridge, and an inlet valve two is arranged on the second slag flushing water pipe.

4. The online backwashing slag discharging filter according to claim 3, wherein: A first slag discharge pipe is connected to the slag discharge port of one of the filter cartridges, and a slag discharging valve one is arranged on the first slag discharge pipe; A second slag discharge pipe is connected to the slag discharge port of the other filter cartridge, and a slag discharging valve two is arranged on the second slag discharge pipe.

5. The online backwashing slag discharge filter according to claim 1, wherein: The slag flushing water inlet is arranged tangentially to the outer wall of the filter cartridge, so that water can enter along the tangential direction to reach the inner wall of the filter cartridge.

6. The online backwashing slag discharging filter according to claim 1, wherein: The filter element includes an upper cover and a first filter element integrally connected to the upper cover. A top cover is arranged at the upper end of the filter cartridge. The bottom end of the upper cover is connected and fixed to the top cover. The upper end of the upper cover has a slag flushing water outlet which is connected to the tee.

7. The online backwashing slag discharge filter according to claim 1, characterized in that: The filter element includes an upper cover, a second filter element and a third filter element. A top cover is arranged at the upper end of the filter cartridge. The upper end of the upper cover has a slag flushing water outlet which is connected to the tee; A receiving ring is arranged at the upper end of the second filter element, and the receiving ring is arranged on the upper end surface of the top cover. The third filter element is telescopically arranged inside the second filter element, and the bottom end of the upper cover is closely attached to the receiving ring.

8. The online backwashing slag discharging filter according to claim 7, characterized in that: A limiting ring is arranged on the inner wall of the bottom end of the second filter element, and a sliding cylinder is arranged at the upper end of the third filter element. The sliding cylinder slides closely along the inner wall of the second filter element, and the bottom end of the sliding cylinder can be received on the limiting ring.

9. The online backwashing slag discharging filter according to claim 8, wherein: A number of limiting convex blocks are evenly distributed in a circumferential direction on the inner wall of the upper end of the second filter element, and a number of avoiding grooves matched with the limiting convex blocks are evenly distributed in a circumferential direction on the outer wall of the sliding cylinder; An annular support is arranged on the inner wall of the second filter element. A number of limiting rods are evenly distributed in a circumferential direction at the upper and lower ends of the support respectively. The limiting rods at the lower end of the support are closely attached to the upper end surface of the sliding cylinder, and the limiting rods at the upper end of the support are closely attached to the bottom wall of the limiting convex blocks.

10. The online backwashing slag discharge filter according to claim 9, characterized in that: Two connecting holes are symmetrically arranged on the limiting convex blocks, and a limiting screw is arranged in the connecting holes.

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