CN216295303U - High-efficient filtration system that hardens is prevented to blast furnace grain slag - Google Patents

Abstract

The utility model provides a blast furnace grain slag anti-hardening high-efficiency filtering system which comprises a bottom filtering pool (1), wherein the bottom filtering pool (1) comprises a bottom plate (11) and a side wall (12), a filtering structure (3) is arranged in the bottom filtering pool (1), the filtering structure (3) comprises a filtering layer (31) and a support (32) which are arranged up and down, a back washing device (6) is arranged between the filtering layer (31) and the bottom plate (11), the back washing device (6) can spray water to the filtering layer (31), and a drainage structure (5) is arranged at the bottom of the bottom filtering pool (1). This high-efficient filtration system that hardens is prevented to blast furnace grain slag can enough realize the high-efficient operation in end filtering pond, fully guarantees the filter effect and realizes the high-efficient separation of filter water and sediment grain, can prolong filter material life again and play the effect of preventing hardening to solve the problem fast after the phenomenon that hardens appears in the filter media, improve maintenance efficiency by a wide margin, avoid influencing the normal production of grain slag technology.

Description

High-efficient filtration system that hardens is prevented to blast furnace grain slag

Technical Field

The utility model relates to the technical field of blast furnace ironmaking equipment, in particular to a hardening-preventing high-efficiency filtering system for blast furnace granulated slag.

Background

High-temperature liquid slag (1350-1500 ℃) can be generated during blast furnace smelting, and about 2.8 hundred million tons of high-temperature liquid slag is generated during domestic molten iron production every year.

The slag is treated by a precipitation filtration method (commonly called bottom filtration method) water slag process at home and abroad. The hydraulic slag flushing is carried out in front of the blast furnace, the slag is smashed by water quenching and then becomes loose slag-water mixture (often called water slag), and the water slag enters the bottom filter tank through a slag flushing ditch. Liquid water is filtered by a plurality of layers of filter materials in the bottom filter tank, solid wet slag particles are left at the top of the filter materials in the bottom filter tank, and then the slag particles are grabbed, loaded and transported outside by a bridge type grab bucket crane. The slag particles (with the particle size of 0.2mm-3mm) obtained after water quenching have wide application, can be used as cement materials, heat insulation fillers and the like, and make full use of the slag.

The blast furnace slag flushing water contains slag wool with certain components, the slag wool easily blocks the filtering gap of the filtering layer in the filtering process of realizing slag-water separation, the filtering layer can be hardened under the long-term action, and the hardened filtering layer loses the filtering function, so that the production of a water slag system cannot be smoothly carried out. The problem of hardening of the filter material becomes a difficult problem which needs to be solved urgently by the process of the bottom filtration method, once the filter material is hardened, the difficulty of replacement is increased, and the smooth production of the blast furnace is seriously influenced. In order to avoid or slow down the problem of hardening of the filter layer, the filter material is generally backwashed by the slag flushing water through the filter pipe at the bottom of the bottom filter.

The filter layer of end filtering pond bottom is usually from last filter material to the granularity grow gradually down, and the filter tube subassembly is arranged to end filtering pond bottom, and the filter tube subassembly generally has two effects: firstly, filtered water is discharged in the process of separating slag from water; and secondly, backwashing the filter material by introducing backwashing water after cleaning the slag particles above the surface layer of the filter material, so that the activity of the filter material is improved, and the service life of the filter material is prolonged.

Whether the filter layer can quickly filter the water granulated slag or not is achieved, the separation of liquid water and slag particles is efficiently achieved, and the filter layer is of great importance to the production of the water granulated slag process. The filtering layer is too tight, so that the filtering efficiency is low, the separation of a slag-water mixture cannot be rapidly completed, the slag grabbing condition with water occurs during slag grabbing, and the cyclic utilization of water resources cannot be fully realized; the filter layer is too sparse, so that fine slag particles cannot be isolated, and the fine slag particles and liquid water enter the circulating water system together, so that the pipeline and the valve of the circulating water system are seriously abraded, and the smooth operation of the water granulated slag process is influenced.

The activity of the filter material can be improved by utilizing the backwashing water, but the filter pipe assembly is arranged at the bottom of the bottom filter tank, so that the main purpose of drainage is achieved; when the backwashing operation is carried out, the backwashing water passes through the multiple layers of filter materials from bottom to top and then acts on the top layer of filter materials which are easy to harden, so that the backwashing effect is not ideal, and the action of the backwashing operation on delaying the hardening of the filter materials can be continuously weakened along with the production.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of hardening of the filter material, the utility model provides a hardening-preventing high-efficiency filter system for blast furnace water granulated slag, which can realize high-efficiency operation of a bottom filter tank, fully ensure the filter effect to realize high-efficiency separation of filter water and slag particles, prolong the service life of the filter material to play a role of hardening prevention, quickly solve the problem after the hardening phenomenon of the filter medium occurs, greatly improve the maintenance efficiency and avoid influencing the normal production of the water granulated slag process.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model provides a blast furnace grain slag high efficiency filtration system that hardens that prevents, includes the end filtering pond, and the end filtering pond contains bottom plate and lateral wall, is equipped with filtration in the end filtering pond, and filtration contains filter layer and the support that sets up from top to bottom, is equipped with back flush unit between filter layer and the bottom plate, and back flush unit can spray water to the filter layer, and the bottom in end filtering pond is equipped with drainage structures.

The bottom filter chamber is internally provided with a filter space which is of a cuboid structure, the drainage structure comprises a plurality of drainage grooves which are positioned in the upper surface of the bottom plate, and the openings of the drainage grooves are upward.

The drainage structure comprises a cuboid structure and a plurality of drainage grooves, wherein the plurality of drainage grooves are arranged at intervals along the width direction of the cuboid structure, the drainage grooves extend along the length direction of the cuboid structure, the drainage structure further comprises a plurality of drainage holes positioned at the lower part of the side wall, and the drainage grooves are communicated with the drainage holes in a one-to-one correspondence mode.

And a grid cover plate is laid at the upper end of the drainage groove, the grid cover plate comprises first grid bars and second grid bars which are arranged in a crossed manner, and the upper surface of the grid cover plate is flush with the upper surface of the bottom plate.

The filter layer is of a modular filter structure, the filter layer comprises a plurality of filter modules which are arranged in rows and columns along the horizontal direction, the support comprises support rods which are correspondingly connected with the filter modules, and the distance between the filter layer and the bottom plate is 0.5-1 m.

The filter module contains filter box and filter medium, and filter box contains bottom grid board and side grid board, and filter box's upper end is open state, and the filter box contains the filter material accommodation space internally, and filter medium is located in the filter material accommodation space.

The filtering module is of a rectangular plate-shaped structure, the thickness of the filtering module is 0.2m-0.6m, the upper surface of the filtering medium is flush with the upper surface of the filtering box body, and the diameter of a filtering body in the filtering medium is gradually reduced along the direction from bottom to top.

Still be equipped with filter layer protection architecture in the end filtering pond, filter layer protection architecture and filtration are range upon range of from top to bottom connected, and filter layer protection architecture contains first girder steel and second girder steel, and first girder steel and second girder steel cross connection become the grid structure, and filter layer protection architecture can block the downward removal of grab sediment fill.

The backwashing device comprises a plurality of backwashing modules which are arranged in a row and a column along the horizontal direction, each backwashing module comprises a backwashing pipe and a pipe bracket which are connected up and down, each backwashing pipe comprises a main backwashing pipe and a branch backwashing pipe which are connected in sequence, each main backwashing pipe and each branch backwashing pipe are parallel to the horizontal plane, one backwashing module corresponds to one filtering module or a plurality of filtering modules, and each backwashing pipe of each backwashing module can independently control a switch.

The filtering module is connected with the backwashing pipe up and down, and the backwashing main pipe and the backwashing branch pipe are connected with the pipe bracket.

The utility model has the beneficial effects that:

1. the filtering box body formed by the grating plates can effectively support the filtering medium without influencing the filtering speed.

2. The filtering medium in the filtering box body forms a gradient configuration with the diameter gradually reduced from bottom to top, the stability of the filtering medium is good, the small-diameter filtering medium on the upper layer cannot be taken away by filtered water, and the efficient operation of the filtering system is fully ensured.

3. The filter box body is used for containing the filter medium, the filter box body is supported by the supporting rod, and the backwashing device is arranged between the filter box body and the bottom plate, so that the number of layers of the filter medium for supporting the top layer filter material can be greatly reduced, the top layer filter material can be effectively supported, the use amount of the filter medium can be reduced, and the investment cost and the later maintenance cost are reduced.

4. The filter module of cuboid shape is covered with bottom filter bottom, and the corresponding filter module of independent quick replacement can be avoided consumeing the manpower and getting into bottom filter and spending the hardened filter medium of plenty of time clearance, improves maintenance efficiency by a wide margin after the filter medium hardened problem appears.

5. The back washing device is arranged close to the bottom of the filter layer, which is beneficial to improving the back washing efficiency.

6. By carrying out targeted operation on the main backwash pipes and the backwash branch pipes in different areas, the targeted backwash in specific areas can be realized for the filter layer, namely, the backwash in areas easy to harden of the filter layer is enhanced, the activity of the filter material in the areas easy to harden is improved, and the service life of the filter material is prolonged.

7. The filter pipe arranged at the bottom of the bottom filter tank in the conventional design is eliminated, and the drainage groove and the drainage hole are used for draining water, so that the filtering efficiency can be greatly improved, and the treatment capacity of the bottom filter tank can be improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

FIG. 1 is a schematic perspective view of the anti-hardening high-efficiency filtering system for the blast furnace granulated slag.

FIG. 2 is a schematic sectional view of the anti-hardening high-efficiency filtering system for the blast furnace granulated slag.

Fig. 3 is a schematic view of a filter layer protection device.

Fig. 4 is a schematic cross-sectional view of a filtration module.

Fig. 5 is a schematic view of a filter housing.

Fig. 6 is a schematic view of a grille cover plate.

Figure 7 is a schematic diagram of a backwash module.

FIG. 8 is a schematic diagram of the backwash partition of the bottoming filter in plan view.

1. A bottom filter chamber; 2. a filter layer protection structure; 3. a filter structure; 4. a grid cover plate; 5. a drainage structure; 6. a backwashing device;

11. a base plate; 12. a side wall; 13. partitioning by backwashing;

21. a first steel beam; 22. a second steel beam;

31. a filter layer; 32. a support; 33. a filtration module; 34. a filter box body; 35. a filter medium; 36. supporting the filter material; 37. a top layer of filter material;

41. a first grid bar; 42. a second grid bar; 43. a grid plate through hole;

61. backwashing the main pipe; 62. back flushing the branch pipe; 63. a tube support;

321. a support bar;

341. a bottom grid plate; 342. side grating plates.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

A blast furnace grain slag anti-hardening high-efficiency filtering system comprises a bottom filtering pool 1, wherein the bottom filtering pool 1 comprises a bottom plate 11 and a side wall 12, a filtering structure 3 is arranged in the bottom filtering pool 1, the filtering structure 3 comprises a filtering layer 31 and a support 32 which are arranged up and down, a back washing device 6 is arranged between the filtering layer 31 and the bottom plate 11, the back washing device 6 can spray water to the filtering layer 31, and a drainage structure 5 is arranged at the bottom of the bottom filtering pool 1, as shown in figures 1 and 2.

This high-efficient filtration system that hardens is prevented to blast furnace grain slag can enough realize the high-efficient operation in end filtering pond, fully guarantees the filter effect and realizes the high-efficient separation of filter water and sediment grain, can prolong filter material life again and play the effect of preventing hardening to solve the problem fast after the phenomenon that hardens appears in the filter media, improve maintenance efficiency by a wide margin, avoid influencing the normal production of grain slag technology.

In the space rectangular coordinate system who uses the X, Y, Z axle as the coordinate axis, contain the filtration space in the end filter 1, bottom plate 11 and lateral wall 12 all around enclose the filtration space, the filtration space is the cuboid structure, and drainage structures 5 is including a plurality of drainage grooves that are located the upper surface of bottom plate 11, drainage grooves's opening is up. The length direction of cuboid structure is parallel with X axle direction, the width direction of cuboid structure is parallel with Y axle direction, the direction of height of cuboid structure is parallel with Z axle direction.

In the present embodiment, the drainage grooves are arranged at intervals along the width direction (i.e., Y-axis direction) of the rectangular parallelepiped structure, the drainage grooves extend along the length direction (i.e., X-axis direction) of the rectangular parallelepiped structure, and the drainage structure 5 further includes a plurality of drainage holes located at the lower portion of the side wall 12, and the drainage grooves and the drainage holes are in one-to-one correspondence communication, as shown in fig. 1 and 2. The bottom plate 11 and the side wall 12 are both of reinforced concrete structures, and the drainage structure 5 is a prefabricated drainage hole and a drainage groove.

In this embodiment, a grid cover plate 4 is laid on the upper end of the drainage groove, the grid cover plate 4 includes a first grid bar 41 and a second grid bar 42 which are arranged in a crossed manner, and the upper surface of the grid cover plate 4 is flush with the upper surface of the bottom plate 11. The function of the grid cover plate 4 is basically the same as that of the well grate, the first grid bars 41 and the second grid bars 42 are connected to form a grid-shaped structure, the grid cover plate 4 comprises grid plate through holes 43, the first grid bars 41 are parallel to the X axis, and the second grid bars 42 are parallel to the Y axis, as shown in fig. 6.

In this embodiment, the filter layer 31 is a modular filter structure, a cavity is formed between the filter layer 31 and the bottom plate 11, the filter layer 31 includes a plurality of filter modules 33 connected in a row-column arrangement along a horizontal direction, a distance between two adjacent filter modules 33 is zero, the bracket 32 includes a support rod 321 correspondingly connected to the filter modules 33, and a distance between the filter layer 31 and the bottom plate 11 is 0.5m to 1 m.

The filter layer 31 with the support rod 321 is flatly placed on the bottom plate 11 of the bottom filter, and the weight of the filter layer 31 is borne by the support 32, so that the modular filter layer 31 is prevented from being in direct contact with the bottom plate 11 of the bottom filter 1, and the filtering efficiency is improved. The filter layer 31 is matched with the bottom filter 1, the grid cover plate 4 is matched with the drainage groove, the filter layer 31 is parallel to the grid cover plate 4, and a set distance (namely the height of the bracket 32) exists between the grid cover plate 4 and the filter layer 31, as shown in fig. 1 and 2. The grating cover plate 4 is made of stainless steel or other corrosion-resistant materials, and can also be made of ordinary steel plates through brushing anti-rust paint. The filtered water of the grating cover plate 4 is finally discharged out of the bottom filter 1 through a drainage structure 5.

In the present embodiment, the filter module 33 is disposed over the entire filter layer 31, the filter module 33 includes a filter box 34 and a filter medium 35, the filter box 34 includes a bottom grid plate 341 and four side grid plates 342, the upper end of the filter box 34 is in an open state, the filter box 34 includes a filter material accommodating space, and the filter medium 35 is located in the filter material accommodating space, as shown in fig. 4 and 5.

The size and the structure of each filtering module 33 are the same, the filtering modules 33 are substantially rectangular plate-shaped structures, the filtering medium 35 is filled in the filtering box 34, the bottom grating plate 341 and the side grating plates 342 are cut from grating plates, the bottom grating plate 341 and the side grating plates 342 can be made of stainless steel plates or other corrosion-resistant materials, or ordinary steel plates can be brushed with anti-rust paint, as shown in fig. 6.

In the present embodiment, the filter module 33 has a rectangular plate-shaped structure, the thickness of the filter module 33 is 0.2m to 0.6m, the upper surface of the filter medium 35 is flush with the upper surface of the filter box 34, and the diameter of the filter body in the filter medium 35 gradually decreases in the direction from bottom to top, as shown in fig. 4 and 5.

The filter medium 35 includes a plurality of filter segments stacked in the Z-axis direction, and each filter segment includes a granular filter body therein. Along from the direction of making progress down, the diameter of filtering the internal filter body of branch diminishes gradually, the superiors filter the internal filter body of branch is for the quartz sand or other smooth filter medium of surface that the slag grain diameter after granulating with blast furnace slag is close.

In the arrangement of the multilayer filter materials of the conventional bottom filter, only the top filter material 37 (cobblestones with the diameter equivalent to that of slag particles) really plays a role in filtering, and the support filter material 36 with the gradually-increased granularity at the lower part only plays a role in supporting the top filter material 37 through layer-by-layer support from bottom to top. According to the utility model, the filter box body 34 is used for containing the filter medium, so that the number of layers and the thickness of the filter medium for supporting the top layer filter material 37 can be greatly reduced, the top layer filter material 37 can be effectively supported, the use amount of the filter medium can be reduced, and the investment cost and the later maintenance cost can be reduced.

Along following ascending direction down, the diameter of filtering the intraformational filter body of filtration divides diminishes gradually, and filter medium stability is good, and the minor diameter filter medium on upper strata can not taken away by the drainage, fully guarantees filtration system's high-efficient operation. The filter box 34 that the grating board is constituteed can effectively support filter medium under the prerequisite that does not influence filter speed, and cuboid platelike filter module 33 is covered with end filter space, and the independent quick replacement of being convenient for after the problem that hardens appears in the filter medium improves maintenance efficiency by a wide margin.

In this embodiment, a filter layer protection structure 2 is further arranged in the bottom filter 1, the filter layer protection structure 2 is connected with the filter structure 3 in an up-down stacking manner, the filter layer protection structure 2 includes a first steel beam 21 and a second steel beam 22, the first steel beam 21 and the second steel beam 22 are connected in a cross manner to form a grid structure, and the filter layer protection structure 2 can block the slag grab bucket from moving downwards, as shown in fig. 3.

The first steel beams 21 are parallel to an X axis, the second steel beams 22 are parallel to a Y axis, the distance between every two adjacent first steel beams 21 is smaller than the size of a slag grab of the grab crane, and the distance between every two adjacent second steel beams 22 is smaller than the size of the slag grab of the grab crane. So that the filter layer 31 can be prevented from being damaged by the grab bucket in the grabbing process of the grab bucket crane, as shown in figure 3.

In this embodiment, the backwashing device 6 includes a plurality of backwashing modules arranged in a row and a column in the horizontal direction, each backwashing module includes a backwashing pipe and a pipe support 63 connected up and down, each backwashing pipe includes a main backwashing pipe 61 and a branch backwashing pipe 62 connected in sequence, the center lines of the main backwashing pipes 61 and the branch backwashing pipes 62 are located in the same horizontal plane, the main backwashing pipes 61 and the branch backwashing pipes 62 are parallel to the horizontal plane, one backwashing module corresponds to one filtering module 33 or a plurality of filtering modules 33, and the backwashing pipe of each backwashing module can be independently controlled to be opened and closed.

The support 32 at the bottom of the filter layer 31 has a height such that there is sufficient space between the filter layer 31 and the floor 11 of the bottom filter for arranging the backflushing device 6. The main backwash pipe 61 and the branch backwash pipes 62 are arranged close to the bottom of the filter layer 31 under the supporting action of the pipe support 63, that is, the filter layer 31 and the backwash pipes are connected in an up-and-down stacked manner. The pipe diameter size of the back washing main pipe 61 is larger than that of the back washing branch pipe 62, and both the back washing main pipe 61 and the back washing branch pipe 62 are provided with upward jet holes for guiding back washing water to back wash the filter layer 31. The filter module 33 is connected with the backwash pipe up and down, and the main backwash pipe 61 and the branch backwash pipe 62 are connected with the pipe support 63. The backwashing device 6 is arranged close to the bottom of the filter layer 31, so that backwashing water is closer to the top layer filter material which is easy to harden.

The bottom of the bottom filter 1 is divided into a plurality of backwashing subareas 13 (such as 9 backwashing subareas 13), and the backwashing subareas 13 correspond to the backwashing modules one by one, that is, each backwashing subarea 13 contains one backwashing module, as shown in fig. 7 and 8. Each backwashing partition 13 is provided with a valve for independently controlling the opening and closing of the backwashing module, so that each backwashing module can be controlled to be opened to spray water or closed to not spray water. Therefore, targeted operation is performed on the main backwash pipes 61 and the backwash branch pipes 62 in different areas, for example, the backwash modules in part of the backwash subareas 13 are opened, the backwash modules in part of the backwash subareas 13 are closed, or the pressure and flow of the backwash water of the backwash modules in part of the backwash subareas 13 are increased, targeted backwash in specific areas is realized on the filter layer 31, namely, backwash on areas which are easy to harden in the filter layer 31 is enhanced, the activity of filter materials in the areas which are easy to harden is improved, and the service life of the filter materials is prolonged.

All structural components of the anti-hardening high-efficiency filtering system for the blast furnace grain slag can be made of stainless steel or other corrosion-resistant materials, and can also be made of common steel plates coated with anti-rust paint in a brushing mode, wherein the anti-rust paint comprises a filtering layer protecting structure 2, a filtering box body 34 of a filtering module 33, a support 32, a back washing main pipe 61 of a back washing device 6, a back washing branch pipe 62, and a grid cover plate 4 covered on the upper surface of a drainage hole or a drainage groove.

The above description is only exemplary of the utility model and should not be taken as limiting the scope of the utility model, so that the utility model is intended to cover all modifications and equivalents of the embodiments, which may be included within the spirit and scope of the utility model. In addition, the technical features and the technical schemes, and the technical schemes can be freely combined and used.

Claims (10)

1. The utility model provides a blast furnace grain slag high efficiency filtration system that hardens that prevents, includes end filtering pond (1), its characterized in that, end filtering pond (1) contains bottom plate (11) and lateral wall (12), is equipped with filtration (3) in end filtering pond (1), and filtration (3) contain filter layer (31) and support (32) that set up from top to bottom, is equipped with back washing unit (6) between filter layer (31) and bottom plate (11), and back washing unit (6) can be to filter layer (31) water spray, and the bottom in end filtering pond (1) is equipped with drainage structures (5).

2. The blast furnace grain slag anti-hardening high-efficiency filtering system according to claim 1, wherein the bottom filtering pool (1) is internally provided with a filtering space which is of a cuboid structure, and the drainage structure (5) comprises a plurality of drainage grooves in the upper surface of the bottom plate (11), and the openings of the drainage grooves face upwards.

3. The blast furnace grain slag anti-hardening high-efficiency filtering system according to claim 2, wherein the plurality of drainage grooves are arranged at intervals along the width direction of the rectangular parallelepiped structure, the drainage grooves extend along the length direction of the rectangular parallelepiped structure, the drainage structure (5) further comprises a plurality of drainage holes located at the lower part of the side wall (12), and the drainage grooves are communicated with the drainage holes in a one-to-one correspondence manner.

4. The anti-hardening high-efficiency filtering system for the blast furnace water granulated slag according to claim 2, wherein a grid cover plate (4) is laid at the upper end of the drainage groove, the grid cover plate (4) comprises a first grid strip (41) and a second grid strip (42) which are arranged in a crossed manner, and the upper surface of the grid cover plate (4) is flush with the upper surface of the bottom plate (11).

5. The blast furnace water slag hardening prevention high-efficiency filtering system according to claim 1, wherein the filtering layer (31) is of a modular filtering structure, the filtering layer (31) comprises a plurality of filtering modules (33) which are connected in a row-column arrangement along a horizontal direction, the bracket (32) comprises a supporting rod (321) which is correspondingly connected with the filtering modules (33), and the distance between the filtering layer (31) and the bottom plate (11) is 0.5m-1 m.

6. The blast furnace water slag hardening prevention high-efficiency filtering system according to claim 5, wherein the filtering module (33) comprises a filtering box body (34) and a filtering medium (35), the filtering box body (34) comprises a bottom grating plate (341) and a side grating plate (342), the upper end of the filtering box body (34) is in an open state, a filtering material accommodating space is contained in the filtering box body (34), and the filtering medium (35) is located in the filtering material accommodating space.

7. The blast furnace grain slag anti-hardening high-efficiency filtering system according to claim 5, wherein the filtering module (33) is of a rectangular plate-shaped structure, the thickness of the filtering module (33) is 0.2m-0.6m, the upper surface of the filtering medium (35) is flush with the upper surface of the filtering box body (34), and the diameter of a filtering body in the filtering medium (35) is gradually reduced along the direction from bottom to top.

8. The blast furnace grain slag anti-hardening high-efficiency filtering system according to claim 1, characterized in that a filtering layer protecting structure (2) is further arranged in the bottom filtering pool (1), the filtering layer protecting structure (2) is connected with the filtering structure (3) in an up-and-down overlapping manner, the filtering layer protecting structure (2) comprises a first steel beam (21) and a second steel beam (22), the first steel beam (21) and the second steel beam (22) are connected in a cross manner to form a grid structure, and the filtering layer protecting structure (2) can block the slag grab bucket from moving downwards.

9. The blast furnace water slag hardening prevention high-efficiency filtering system according to claim 5, wherein the backwashing device (6) comprises a plurality of backwashing modules arranged in a row and a column along a horizontal direction, each backwashing module comprises a backwashing pipe and a pipe support (63) connected up and down, each backwashing pipe comprises a main backwashing pipe (61) and a branch backwashing pipe (62) connected in sequence, each main backwashing pipe (61) and each branch backwashing pipe (62) are parallel to a horizontal plane, one backwashing module corresponds to one filtering module (33) or a plurality of filtering modules (33), and the backwashing pipe of each backwashing module can be independently controlled to be switched on and off.

10. The anti-hardening high-efficiency filtering system for blast furnace water granulated slag according to claim 9, wherein the filtering module (33) is connected with the back washing pipe up and down, and the back washing main pipe (61) and the back washing branch pipe (62) are connected with the pipe bracket (63).

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