An on-line cleaning device for a rock salt mine well injection fresh water filter

Abstract

The utility model discloses a kind of rock salt mine well injection fresh water filter on-line cleaning device, belong to well salt mining technical field, including filter body, the front and rear ends of filter body are respectively inlet end and outlet end, filter body includes sequentially welded N filter sections along well injection raw water flow direction, N is natural number greater than 1, different aperture filter plate is arranged between adjacent filter sections, the aperture of filter plate sequentially decreases along well injection raw water flow direction;Rinse assembly for flushing each filter plate is arranged on filter body, rinse assembly includes water distribution pipe, water distribution pipe is inserted into the upper end portion of corresponding filter section along horizontal direction, water distribution pipe is connected with the supply unit of flushing water by pipeline, and jet hole group is arranged on water distribution pipe;Drain pipe is provided at the bottom of filter body.The utility model realizes the on-line cleaning of filter, improves cleaning efficiency and operating safety, ensures the continuous stable operation of mining system, while reducing environmental risk and maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the field of well salt mining technology, and in particular relates to an online cleaning device for a freshwater filter for rock salt mine well injection. Background Technology

[0002] Well-drilling water-soluble extraction is currently the mainstream technology for rock salt mining. It involves injecting fresh water into underground salt layers to dissolve the rock salt and form saturated brine, which is then extracted. In this process, the quality of the injected fresh water directly affects the operational efficiency and equipment lifespan of the extraction system. The injected fresh water mainly consists of two parts: first, condensate and process wastewater from the salt production unit, containing impurities such as residual sodium chloride, calcium sulfate, magnesium hydroxide, and equipment scale; second, replenishment water, usually surface water, carrying a large amount of suspended solids, clay, mineral particles, and organic residues. The mixing of these two water sources results in a complex composition and dynamic changes in the water quality of the injected fresh water. The solid particles and cementitious materials it contains pose a serious threat to the key equipment of the brine extraction system.

[0003] Specifically, impurities in freshwater injected into wells can cause the following problems: 1. Wear and blockage of brine pump: Solid particles accelerate the erosion of impeller and seals, leading to decreased pump efficiency, blockage of flow channels and subsequent vibration and noise, which seriously affects the service life of the equipment; 2. Valve sealing failure and operational malfunction: Impurities accumulate on the sealing surface, causing incomplete closure and internal parts to become stuck, affecting regulation performance and system control; 3. Increased pipe resistance and aggravated corrosion: Particles accumulate at bends and diameter changes, reducing the effective pipe diameter, increasing water flow resistance, and exacerbating pipe wall damage in conjunction with corrosive components; 4. Scaling and reduced production capacity in brine wells: Calcium sulfate and other substances deposit inside the well casing, narrowing the flow channels, increasing flow resistance, reducing brine extraction efficiency, and shortening the service life of the well.

[0004] To address these issues, existing rock salt mines typically install multi-stage filters in their water injection systems to grade and filter the raw water from injection wells, producing clean injection water that meets the required standards. However, as operating time increases, the filter plates and inner walls gradually become covered with impurities, resulting in decreased filtration capacity and reduced flow volume. In severe cases, this can lead to cavitation and steam suction in the brine pump, threatening the stable operation of the system.

[0005] Currently, filter cleaning still mainly relies on manual offline operations, which involve manually cleaning the filter plates and inner walls after shutdown, isolation, and disassembly. This method has significant drawbacks: the cleaning cycle is long (approximately 12 hours), affecting the continuity of mining; the labor intensity is high, requiring workers to enter narrow containers to operate, posing a high safety risk; the use of chemical descaling agents can easily cause environmental pollution; and the overall cleaning efficiency is low, failing to meet the needs of continuous mine production. Summary of the Invention

[0006] To address the problems existing in the prior art, this utility model provides an online cleaning device for freshwater filters in rock salt mines, which enables online cleaning of the filters, significantly improving cleaning efficiency and operational safety, ensuring the continuous and stable operation of the mining system, and reducing environmental risks and maintenance costs.

[0007] This utility model is implemented as follows: an online cleaning device for freshwater filter in rock salt mine injection wells includes a filter body, with the front and rear ends of the filter body being the inlet end and the outlet end, respectively. The filter body includes N filter sections welded sequentially along the direction of the injection well water flow, where N is a natural number greater than 1. Filter plates with different pore sizes are arranged between adjacent filter sections, and the pore size of the filter plates decreases sequentially along the direction of the injection well water flow. The filter body is provided with a rinsing assembly for rinsing each filter plate. The rinsing assembly includes a water distribution pipe, which is inserted horizontally into the upper end of the corresponding filter section. The water distribution pipe is connected to the rinsing water supply unit through a pipeline, and the water distribution pipe is provided with a jet hole group. The bottom of the filter body is equipped with a drain pipe for discharging wastewater generated after the filter plate washing operation.

[0008] Furthermore, a support member is spanned across the bottom of adjacent filter sections, a connecting member is provided at the top of the joint of each filter section, and a cover plate is provided on the adjacent connecting member. The support member, connecting member and cover plate enclose an installation space for installing filter plates.

[0009] Furthermore, the jet hole group is disposed on the fan-shaped pipe wall area facing the filter plate, and the jet hole group includes three rows of flushing water holes that are parallel to each other along the axial direction of the water distribution pipe. The center lines of the three rows of flushing water holes are at angles of 30°, 45° and 60° with the horizontal plane, respectively.

[0010] Furthermore, the cross-section of the supporting member is U-shaped, and the cross-section of the connecting member is inverted L-shaped.

[0011] Furthermore, the bottom plate and side plate of the filter section are connected by a discharge port, and the connection end of the drain pipe is provided with an installation notch with an L-shaped cross-section. The installation notch includes a horizontal section and a vertical section. The horizontal section is connected to the bottom plate of the filter section, and the vertical section is connected to the side plate of the filter section.

[0012] Furthermore, a fixing shoe is provided on the inner wall of the filter section for placing the fixed end of the water distribution pipe. The fixed end of the water distribution pipe is inserted into the fixing shoe. The water inlet end of the water distribution pipe extends outward through the filter section and is connected to the mounting flange on the outer wall of the filter section through the positioning flange on the pipe body.

[0013] Furthermore, an vent pipe is installed at the upper end of the filter section near the inlet.

[0014] Furthermore, the filter section is provided with four sections, which are sequentially arranged along the direction of the raw water flow in the injection well as the first filter section, the second filter section, the third filter section and the fourth filter section. The water distribution pipes are respectively installed at the upper ends of the second, third and fourth filter sections; The drain pipes are respectively installed at the bottom of the first filter section, the second filter section, and the third filter section.

[0015] Furthermore, the filter plate is provided with three parts: a primary filter plate, a secondary filter plate, and a high-pressure filter plate. The primary filter plate has a pore size of Ф15mm, the secondary filter plate has a pore size of Ф10mm, and the high-pressure filter plate has a pore size of Ф5mm.

[0016] Furthermore, each of the filter sections has a manhole for maintenance located in the middle of its side.

[0017] The advantages and technical effects of this utility model are as follows: By adopting the above technical solution, the cleaning efficiency and operational safety are significantly improved by realizing online cleaning of the filter, ensuring the continuous and stable operation of the mining system, while reducing environmental risks and maintenance costs.

[0018] By adopting a multi-stage filtration structure and combining filter plates with different pore sizes, progressive filtration and segmented cleaning are achieved, effectively removing impurities accumulated on the filter plates and inner walls of the filter, restoring filtration performance, ensuring that each section of the filter plate maintains the optimal flow rate, and guaranteeing the continuous and stable operation of the rock salt mine injection system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the filter plate installation structure provided in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the water distribution pipe installation provided in an embodiment of this utility model.

[0022] Figure 4 This is a schematic diagram showing the position of the jet hole assembly provided in this embodiment of the utility model.

[0023] Figure 5 This is a schematic diagram of the drainage pipe installation provided in an embodiment of this utility model.

[0024] Figure 6 This is a schematic diagram of the drainage pipe structure provided in an embodiment of this utility model.

[0025] In the diagram: 1. Filter body; 1-1. Inlet end; 1-2. Outlet end; 1-3. First filtration section; 1-4. Second filtration section; 1-5. Third filtration section; 1-6. Fourth filtration section; 1-7. Discharge port; 2. Filter plate; 3. Washing assembly; 3-1. Water distribution pipe; 3-2. Jet hole assembly; 4. Drain pipe; 4-1. Installation notch; 4-2. Horizontal section; 4-3. Vertical section; 5. Manhole; 6. Drain pipe; 7. Supporting component; 8. Connecting component; 9. Cover plate; 10. Installation space; 11. Fixing shoe. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0027] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] like Figures 1 to 6 As shown, this application provides an online cleaning device for a freshwater filter in a rock salt mine injection well, including a filter body 1. The front and rear ends of the filter body 1 are an inlet end 1-1 and an outlet end 1-2, respectively. Specifically, the filter body 1 is a vertically arranged rectangular cabinet with a cuboid outline. In one embodiment, the filter body 1 has specific dimensions of 3200×1200×1200mm, a total length of 3200mm, and a wall thickness of 20mm.

[0029] The DN600 inlet at the front end of the filter body 1 is defined as the channel for injecting raw water during normal brine extraction. A DN600 inlet valve is installed at this inlet, serving as the actuator for switching between normal production and online cleaning modes. The DN600 outlet at the rear end of the filter body 1 is the outflow path for clean water injected during normal brine extraction. The DN600 outlet valve at this outlet is a key control component for controlling the opening and closing of this path to achieve the switching between normal production and online cleaning modes.

[0030] The filter body 1 comprises N filter sections welded sequentially along the direction of the injection well water flow, where N is a natural number greater than 1. Adjacent filter sections are separated by filter plates 2 with different pore sizes, the pore size of which decreases sequentially along the direction of the injection well water flow. Specifically, each filter plate 2 is made of 316L stainless steel, with uniform flat plate dimensions of 1280mm × 1280mm and a plate thickness of 20mm. The center of each filter plate 2 is the effective filtration area, with a uniform opening size of 1200mm × 1200mm.

[0031] The filter body 1 is equipped with a rinsing assembly 3 for rinsing each filter plate 2. The rinsing assembly 3 includes a water distribution pipe 3-1, which is inserted horizontally into the upper end of the corresponding filter section. The water distribution pipe 3-1 is connected to a rinsing water supply unit via a pipeline, and a jet orifice group 3-2 is provided on the water distribution pipe 3-1. Specifically, the supply unit includes a cleaning pump, a flow meter, control valves, and pipeline accessories. Its function is to provide and regulate the rinsing medium with specific pressure and flow rate for the entire cleaning process. The supply unit delivers cleaning water from an external water source to the water distribution pipe 3-1 through pipelines, ensuring that the rinsing water covers each level of filter plate 2 evenly and that the backwashing force achieves an optimal balance.

[0032] The bottom of the filter body 1 is provided with a drain pipe 4 for discharging wastewater generated after the filter plate 2 is washed. Specifically, the drain pipe 4 is located at the intersection of the side of the filter section and the bottom plate.

[0033] Preferably, a space for placing filter plates 2 is provided between adjacent filter sections. A support member 7 spans the bottom of each adjacent filter section. The support member 7 has a U-shaped cross-section, forming a support structure closed at the bottom and both sides. A connecting member 8 is vertically welded to the top of each filter section's joint. The connecting member 8 has an inverted L-shaped cross-section. Both the support member 7 and the connecting member 8 are made of easily weldable steel. Thus, the support member 7 and the connecting member 8 together enclose the gap between adjacent filter sections to form a rectangular insertion space with an open top. Except for the top, the edges of the other five sides (i.e., the front and rear sides, left and right sides, and the bottom facing the water flow direction) of this space are closed, facilitating the vertical insertion of the filter plates 2 into this rectangular insertion space from the open top.

[0034] A cover plate 9 is provided on the adjacent connecting member 8. The cover plate 9 is detachably connected to the connecting member 8 by bolts. After the filter plate 2 is placed in this rectangular insertion space and installed in place, the cover plate 9 is fastened to the connecting member 8 with bolts, thereby sealing the top opening. The supporting member 7, the connecting member 8, and the cover plate 9 enclose an installation space 10 for installing the filter plate 2. Specifically, the flange thickness of the cover plate 9 is 30mm, the bolt hole diameter is Ф26, the opening spacing is 50mm, and the bolt specification is M24×100.

[0035] Preferably, the jet hole group 3-2 is disposed on the fan-shaped pipe wall area facing the filter plate 2. The jet hole group 3-2 includes three rows of flushing water holes parallel to the axial direction of the water distribution pipe 3-1. The center lines of the three rows of flushing water holes form angles of 30°, 45°, and 60° with the horizontal plane, respectively. Specifically, the diameter of the flushing water holes is Φ10mm, and the hole spacing is 18mm. This multi-angle composite arrangement achieves three-dimensional full coverage of the filter plate 2 surface by the flushing water flow from top to bottom. Among the three rows of flushing water holes, the upper row of holes with an angle of 30° covers the upper and middle areas of the filter plate 2, the middle row of holes with an angle of 45° covers the core area of ​​the filter plate 2, and the lower row of holes with an angle of 60° covers the lower and middle areas of the filter plate 2. The three rows work together to ensure that there are no dead corners in the flushing and achieve the best balance between impact force and coverage uniformity, thereby efficiently removing various attached impurities.

[0036] Preferably, the bottom plate and side plate of the filter section are provided with discharge ports 1-7, and the connecting end of the drain pipe 4 is provided with an installation notch 4-1 with an L-shaped cross-section. The installation notch 4-1 includes a horizontal section 4-2 and a vertical section 4-3. The horizontal section 4-2 is connected to the bottom plate of the filter section, so that the discharge port 1-7 of the bottom plate of the filter section is connected to the drain pipe 4 through the notch of the horizontal section 4-2. The vertical section 4-3 is connected to the side plate of the filter section, so that the discharge port 1-7 of the side plate of the filter section is connected to the drain pipe 4 through the notch of the vertical section 4-3. Specifically, the drain pipe 4 is all DN150.

[0037] The advantages of this installation structure are: 1. Low-level flow diversion: The effective flow surface of wastewater discharge outlets 1-7 is designed below the plane of the filter section's bottom plate, forming a drainage weir effect. This utilizes gravitational potential energy to reduce discharge resistance, thereby significantly improving wastewater discharge efficiency. 2. Stable structure: The L-shaped cross-section structure, through its large welded surfaces on both sides, is firmly connected to the side plates and bottom plate of the filter section, ensuring the rigidity and stability of the overall structure. This allows it to withstand the large fluid forces and mechanical stresses that may occur during system operation.

[0038] Preferably, a fixing shoe 11 is provided on the inner wall of the filter section for placing the fixed end of the water distribution pipe 3-1. The fixed end of the water distribution pipe 3-1 is inserted into the fixing shoe 11. The water inlet end of the water distribution pipe 3-1 extends outward through the filter section and is connected to the mounting flange on the outer wall of the filter section through a positioning flange on the pipe body. The pipe is connected to the flushing water supply unit through the external flange of the water distribution pipe 3-1. Specifically, the water distribution pipe 3-1 is made of 316L Φ133×6 stainless steel pipe, with a total length of 1575mm.

[0039] Preferably, an exhaust pipe 6 is provided at the upper end of the filter section near the inlet end 1-1. Specifically, the exhaust pipe 6 is DN100. The exhaust pipe 6 is configured to discharge internal gas when flushing water is pumped into the filter, and to draw in external air when the filter discharges wastewater.

[0040] Preferably, each of the filter sections has a manhole 5 for maintenance located in the middle of its side. The manhole 5 is DN500, providing access for personnel to perform internal inspection and maintenance under normal conditions; and providing access for emergency manual cleaning in case of abnormal conditions such as filter plate blockage or scaling.

[0041] In one embodiment, four filtration sections are provided, which are sequentially arranged along the direction of the raw water flow in the injection well as a first filtration section 1-3, a second filtration section 1-4, a third filtration section 1-5, and a fourth filtration section 1-6; three water distribution pipes 3-1 are provided, which are respectively located at the upper ends of the second filtration section 1-4, the third filtration section 1-5, and the fourth filtration section 1-6; and three drain pipes 4 are provided, which are respectively located at the bottom of the first filtration section 1-3, the second filtration section 1-4, and the third filtration section 1-5.

[0042] The filter plate 2 has three sections: a pre-filter, a medium-filter, and a high-efficiency filter. The pre-filter is positioned between the first filtration section 1-3 and the second filtration section 1-4. The medium-filter is positioned between the second filtration section 1-4 and the third filtration section 1-5. The high-efficiency filter is positioned between the third filtration section 1-5 and the fourth filtration section 1-6, forming a progressive filtration structure. The pre-filter has a pore size of Ф15mm and is mainly used to intercept large-sized particulate impurities in the water, such as scale flakes and gypsum particles. The medium-filter has a pore size of Ф10mm and is used to retain medium-sized suspended solids and slurry-like substances. The high-efficiency filter has a pore size of Ф5mm and serves as the final filtration stage, ensuring the cleanliness of the effluent and effectively removing fine particles.

[0043] By adopting the above technical solution, online cleaning of the filter significantly improves cleaning efficiency and operational safety, ensures the continuous and stable operation of the mining system, and reduces environmental risks and maintenance costs.

[0044] By adopting a multi-stage filtration structure and combining filter plates with different pore sizes, progressive filtration and segmented cleaning are achieved, effectively removing impurities accumulated on the filter plates and inner walls of the filter, restoring filtration performance, ensuring that each section of the filter plate maintains the optimal flow rate, and guaranteeing the continuous and stable operation of the rock salt mine injection system.

[0045] Highly efficient and automated online cleaning has been achieved: a complete closed-loop cleaning circuit has been constructed by integrating a flushing water supply unit, multi-angle water distribution pipes 3-1, and a low-level wastewater discharge system. This device can start the automated cleaning process with a single button press without affecting the normal operation of the filter, completely replacing the traditional, inefficient, and high-risk manual offline cleaning operations, thus ensuring the continuity and stability of rock salt mining.

[0046] Scientific structural design and excellent cleaning effect: The core innovation of this utility model lies in its ingenious structural design.

[0047] Zoning and Grading: The filter body 1 adopts a four-section, three-station layout, which works in conjunction with the multi-stage gradient filter plate system to realize the functional zoning of filtration and cleaning.

[0048] Three-dimensional rinsing: The rinsing water distribution pipe 3-1 adopts a three-row jet hole design of 30°, 45° and 60°, forming a three-dimensional rinsing network from top to bottom on the filter plate surface, ensuring no dead corners in rinsing, and achieving the best balance between uniform coverage and impact force.

[0049] High-efficiency discharge: The unique horizontal "L"-shaped wastewater discharge outlet 1-7 design greatly reduces discharge resistance through low-level diversion and gravity effect, and can quickly discharge flushing wastewater from the system.

[0050] Safe, reliable, and easy to maintain: All pressure-bearing components of the device (such as filter body 1 and water distribution pipe 3-1) are made of corrosion-resistant materials such as 316L stainless steel. Key connections use a combination of welding and flange bolts to ensure overall structural strength and sealing. Meanwhile, the well-designed DN500 maintenance manhole 5 provides necessary emergency maintenance access, balancing the convenience of automated operation with the accessibility of maintenance.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An online cleaning device for a freshwater filter used in rock salt mine well injection, characterized in that, The filter includes a filter body, with an inlet and an outlet at its front and rear ends, respectively. The filter body includes N filter sections welded sequentially along the direction of the injection well water flow, where N is a natural number greater than 1. Filter plates with different pore sizes are arranged between adjacent filter sections, and the pore size of the filter plates decreases sequentially along the direction of the injection well water flow. The filter body is provided with a rinsing assembly for rinsing each filter plate. The rinsing assembly includes a water distribution pipe, which is inserted horizontally into the upper end of the corresponding filter section. The water distribution pipe is connected to the rinsing water supply unit through a pipeline, and the water distribution pipe is provided with a jet hole group. The bottom of the filter body is equipped with a drain pipe for discharging wastewater generated after the filter plate washing operation.

2. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 1, characterized in that, The bottom of adjacent filter sections is connected by a support member, and a connecting member is provided at the top of the joint of each filter section. A cover plate is provided on the adjacent connecting member. The support member, connecting member and cover plate enclose an installation space for installing filter plates.

3. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 1 or 2, characterized in that, The jet hole group is set on the fan-shaped pipe wall area facing the filter plate. The jet hole group includes three rows of flushing water holes that are parallel to each other along the axial direction of the water distribution pipe. The center lines of the three rows of flushing water holes are at angles of 30°, 45° and 60° with the horizontal plane, respectively.

4. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 2, characterized in that, The supporting member has a U-shaped cross-section, and the connecting member has an inverted L-shaped cross-section.

5. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 1, characterized in that, The bottom plate and side plate of the filter section are connected by a discharge port. The connection end of the drain pipe is provided with an installation notch with an L-shaped cross-section. The installation notch includes a horizontal section and a vertical section. The horizontal section is connected to the bottom plate of the filter section, and the vertical section is connected to the side plate of the filter section.

6. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 1, characterized in that, A fixing shoe is provided on the inner wall of the filter section for placing the fixed end of the water distribution pipe. The fixed end of the water distribution pipe is inserted into the fixing shoe. The water inlet end of the water distribution pipe extends outward through the filter section and is connected to the mounting flange on the outer wall of the filter section through the positioning flange on the pipe body.

7. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 1, characterized in that, An vent pipe is installed at the upper end of the filter section near the inlet.

8. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 1, characterized in that, The filter section is provided in four sections, which are arranged sequentially along the direction of the raw water flow in the injection well: the first filter section, the second filter section, the third filter section, and the fourth filter section. The water distribution pipes are respectively installed at the upper ends of the second, third and fourth filter sections; The drain pipes are respectively installed at the bottom of the first filter section, the second filter section, and the third filter section.

9. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 8, characterized in that, The filter plate is provided with three plates: a primary filter plate, a secondary filter plate, and a high-pressure filter plate. The primary filter plate has a pore size of Ф15mm, the secondary filter plate has a pore size of Ф10mm, and the high-pressure filter plate has a pore size of Ф5mm.

10. The online cleaning device for freshwater filters in rock salt mine injection wells according to claim 1, characterized in that, Each of the filter sections has a manhole for maintenance located in the middle of its side.

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