A replaceable filter media device for blast furnace bottom slag treatment

Abstract

This application relates to a replaceable filter media device for blast furnace slag treatment using a bottom filtration method, belonging to the field of blast furnace slag filtration treatment. It includes a filter tank, multiple independently configured filter modules, and a support frame. The filter tank has a return water main interface at its bottom. The filter modules are prefabricated structures, and after overall fabrication, each filter module is installed on the support frame. Each filter module can be individually disassembled and hoisted, forming a separable support connection with the support frame. Each filter module includes a steel frame structure and an internal filter layer structure disposed within the steel frame. The side walls of the steel frame structure are closed structures with perforated steel plates, and the top is open. A ceramic filter plate layer is provided at the bottom of the steel frame structure, and the bottom of the ceramic filter plate layer abuts against the support frame. This application has the effect of enabling rapid replacement of the plated filter layer at a fixed point, while reducing the construction, maintenance, and repair costs of the filter layer, thus improving economic efficiency.

Description

Technical Field

[0001] This application relates to the field of blast furnace slag filtration and treatment, and in particular to a replaceable filter media device for blast furnace bottom filtration slag treatment. Background Technology

[0002] The slag treatment system is an indispensable production auxiliary system in ironmaking plants. During the blast furnace production process, a large amount of blast furnace slag is generated. Under the action of slag flushing water, the blast furnace slag flows into the slag filter pool through the slag flushing ditch. The blast furnace slag filter pool is a concrete structure with a filter material layer laid at the bottom. The circulating slag flushing water enters from the top of the pool and flows out through the filter material layer at the bottom of the pool to the return water main pipe at the bottom of the filter material layer. The filtered slag is trapped on the filter layer and is grabbed out by the grab crane.

[0003] Environmental bottom filtration uses industrial water as flushing water, which easily causes the filter media at the bottom of the filter cake tank to clump together, affecting the outflow speed of the flushing water and greatly impacting the flushing efficiency and effect. Therefore, the filter media at the bottom of the filter cake tank needs to be replaced in a timely manner. In traditional bottom filtration methods, the thickness of the filter layer laid with pebbles is generally more than 1.5m, with a four-level structure, and the total weight reaches 500-1000t. The work of breaking down and cleaning the filter media is also hindered by the upper protective frame, making the cleaning of clumps and replacement of the filter layer the most important maintenance work for operators and maintenance personnel.

[0004] Bottom filtration, also known as sludge filtration, essentially uses sludge and a layer of fine-grained filter media to filter a mixture of sludge and water. Traditional bottom filtration systems typically have a pebble layer thickness exceeding 1.5m, but the actual filtration effect comes from the sludge on top of the filter media, forming a filtration interface. The sludge above this interface is controlled by transfer, adsorption, and stripping mechanisms, remaining on the surface of the filter layer.

[0005] When replacing filter media in traditional bottom filtration methods, it is necessary to use both manual and mechanical means to completely break down and clean the filter media, and then dig out the broken and compacted filter layer from the protective frame. This cannot meet the requirements for fixed-point maintenance of local filter media at the bottom of the filter tank. Not only is it time-consuming and the labor intensity of employees is correspondingly increased, but if the filter media is not replaced in time, dry residue also needs to be discharged, which affects economic efficiency. Utility Model Content

[0006] In order to achieve rapid replacement of the plated filter layer at a fixed location, while reducing the construction, maintenance and repair costs of the filter layer and improving economic efficiency, this application provides a replaceable filter media device for blast furnace bottom slag treatment.

[0007] This application provides a replaceable filter media device for treating blast furnace bottom slag, which adopts the following technical solution:

[0008] A replaceable filter media device for treating blast furnace bottom slag includes a slag tank, multiple independently configured filter modules and a support frame, wherein the bottom of the slag tank is provided with a return water main pipe interface;

[0009] The filter module is a prefabricated structure. After the entire assembly is completed, each filter module is installed on the support frame.

[0010] Each of the filter modules can be individually disassembled and hoisted, forming a separable support connection with the support frame.

[0011] By adopting the above technical solution, the device can realize the individual disassembly and hoisting of each filter module and the detachable connection with the support frame. It can realize the offline rapid replacement of the plated filter layer at a fixed point. The filter module has a certain working space with the bottom of the pool, and the individual filter module is thinner and requires less filter material. By using individual and independent operating units, the problem of large workload, high cost and long maintenance time of cleaning plated filter layers in the traditional bottom filtration method is eliminated, the replacement efficiency is improved, the labor intensity and maintenance cost are reduced, and the main structure of the filter cake pool is not damaged, thus making the filter cake pool have a longer service life.

[0012] Optionally, each filter module includes a steel frame and an internal filter layer structure disposed within the steel frame. The sidewalls of the steel frame are closed structures with perforated steel plates and an opening at the top.

[0013] The bottom of the steel structure frame is provided with a ceramic filter plate layer, and the bottom of the ceramic filter plate layer abuts against the support frame.

[0014] By adopting the above technical solution, the filter module uses a combination of a steel frame and an internal filter layer structure, giving the filter module an independent structure that can be used as an independent operating unit. The structure of the steel frame with perforated steel plates on the side walls and an open top ensures the air permeability of the filter module and the interactive flow of flushing water between each filter module. A ceramic filter plate layer is set at the bottom of the steel frame, utilizing the strength and permeability of the ceramic filter plate to meet the filtration requirements, and allowing the bottom of the filter module to abut against the support frame, improving replacement efficiency.

[0015] Optionally, the interior of the ceramic filter plate layer is a composite filter plate layer structure formed by Al2O3 aggregate being wrapped and bonded by molten binder, and the Al2O3 aggregate has through-hole pore channels.

[0016] By adopting the above technical solution, the Al2O3 aggregate inside the ceramic filter plate is wrapped and bonded by the molten binder, and there are through-hole pore channels between the aggregates. This enables the ceramic filter plate to have both high strength and high permeability, improve the filtration speed, and also give the filter material good wear resistance and erosion resistance.

[0017] Optionally, the internal filter layer structure includes, from bottom to top, a first pebble packing layer, a second pebble packing layer, and a finished blast furnace slag layer disposed above the ceramic filter plate layer, wherein the particle size distribution of the first pebble packing layer and the second pebble packing layer is decreasing.

[0018] By adopting the above technical solution, the internal filter layer structure consists of a first pebble packing layer, a second pebble packing layer, and a finished blast furnace slag layer from bottom to top. The internal filter layer structure replaces the traditional filter layer material as the water slag filtration interface, reducing the limitation of traditional filter layers requiring a large number of large-particle pebbles for support. Furthermore, it mainly relies on the second pebble packing layer and the finished blast furnace slag layer with smaller particle size for filtration, resulting in better filtration effect.

[0019] Optionally, the thickness of the second pebble filler layer is greater than the thickness of the first pebble filler layer, and the thickness of the finished blast furnace slag layer is greater than the thickness of the second pebble filler layer.

[0020] By adopting the above technical solution, the optimal filtration effect of the filter media device can be achieved by reasonably setting the thickness of each layer. The thickness of the second pebble packing layer is greater than that of the first pebble packing layer. Because the particle size of the second pebble packing layer is smaller, the thicker layer provides a finer filtration layer, effectively intercepting smaller slag particles and preventing fine slag particles from passing through the lower first pebble packing layer, thus improving the overall filtration accuracy. The thickness of the finished blast furnace slag layer is greater than that of the second pebble packing layer. The finished blast furnace slag layer is located at the top and plays an important role in preliminary filtration and buffering the impact of water flow. The thicker finished blast furnace slag layer can accommodate more slag, enhancing the interception capacity of larger slag particles. At the same time, it protects the subsequent filtration layers, preventing too much slag from directly impacting the lower second pebble packing layer and extending the service life of the entire filtration module. The layer thickness setting optimizes the distribution and penetration path of the flushing water in each layer, allowing the water flow to pass through each layer more evenly and fully utilize the filtration function of each layer.

[0021] Optionally, the support frame is a three-dimensional mesh structure, and its mesh size matches the outer contour size of a single filter module.

[0022] By adopting the above technical solution, the support frame is a three-dimensional grid structure that divides the original whole filter material layer at the bottom of the slag tank into multiple filter modules that cooperate with the support frame. On the one hand, it can stably place the filter modules on the support frame and ensure the stability of the device structure; on the other hand, it can enable the filter module, an independent operating unit, to be quickly moved to achieve modular and rapid standard replacement between different units, making the entire slag filtration process more flexible and fundamentally eliminating the problems of large amount of caking and long maintenance time in traditional bottom filtration methods.

[0023] Optionally, the top of the steel structure frame is fixed with lifting lugs.

[0024] By adopting the above technical solution, the lifting lugs provide a force point for the hoisting of the steel structure frame, and the filter module can be lifted out separately using the lifting lugs to achieve the fixed-point and rapid replacement of the plated filter layer.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The filter module is an independent prefabricated structure that can be disassembled and hoisted separately from the support frame, enabling quick replacement of the plated filter layer at a fixed point;

[0027] 2. The filter module replaces the traditional filter layer media as the water sludge filtration interface, eliminating the need for large-particle pebbles for support, resulting in better filtration, reduced maintenance and repair costs for the filter sludge tank, lower construction and maintenance costs, and significant economic benefits.

[0028] 3. Individual filter modules are thinner and require less filter media. By using individual, independent operating units, the problems of large workload, high cost and long maintenance time in cleaning the plated filter layer of traditional bottom filtration methods are eliminated, thereby improving replacement efficiency, reducing labor intensity and maintenance costs, and without damaging the main structure of the filter cake tank, thus extending the service life of the filter cake tank.

[0029] 4. The filter module adopts a combination of steel structure frame and internal filter layer structure, so that the filter module has an independent structure and can be used as an independent operating unit. The structure of the steel structure frame with perforated steel plates on the side wall and an open top ensures the air permeability of the filter module and the interactive flow of slag flushing water between each filter module.

[0030] 5. The second pebble packing layer is thicker than the first pebble packing layer. Because the particle size of the second pebble packing layer is smaller, the thicker layer provides a finer filtration layer, effectively intercepting smaller slag particles and preventing fine slag particles from passing through the lower first pebble packing layer, thus improving the overall filtration accuracy. The finished blast furnace slag layer is thicker than the second pebble packing layer. Located at the top, the finished blast furnace slag layer plays an important role in preliminary filtration and buffering water flow impact. The thicker finished blast furnace slag layer can accommodate more slag, enhancing the interception capacity for larger slag particles. At the same time, it protects the subsequent filtration layers, preventing excessive slag from directly impacting the lower second pebble packing layer and extending the service life of the entire filtration module. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the blast furnace bottom filtration slag treatment filter media device in this application;

[0032] Figure 2 This is a schematic diagram showing the structure of a single filter module;

[0033] Figure 3 It means Figure 2 Cross-sectional view at point AA.

[0034] Explanation of reference numerals in the attached drawings: 1. Filter slag tank; 2. Filter module; 21. Steel structure frame; 22. Internal filter layer structure; 221. First pebble packing layer; 222. Second pebble packing layer; 223. Finished blast furnace slag layer; 23. Ceramic filter plate layer; 3. Support frame. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0036] This application mainly adopts the method of setting the filter media as a module that can be detached and installed separately, which achieves the effect of quick replacement of the filter media at fixed points and reduces maintenance costs. The following is a further detailed description of this application.

[0037] This application discloses a replaceable filter media device for blast furnace bottom slag treatment. (Refer to...) Figure 1 and Figure 2 The blast furnace bottom filtration slag treatment filter media device includes a slag tank 1, multiple independently set filter modules 2, and a support frame 3. The slag tank 1 is equipped with a return water main interface at the bottom, and the multiple independent filter modules 2 are installed on the support frame 3. Each filter module 2 adopts a prefabricated structure that can be disassembled and hoisted individually, and forms a separable support connection with the support frame 3. In this way, when the filter media of a certain filter module 2 needs to be replaced, it can be hoisted out and replaced individually, without having to break and clean the entire filter media layer as in traditional methods, which greatly improves the replacement efficiency. The reason for this beneficial effect is that the independent setting of the filter module 2 allows the replacement operation to be carried out in a targeted manner, avoiding the trouble caused by large-scale operations.

[0038] Specifically, refer to Figure 1 and Figure 3 The support frame 3 is constructed from welded steel plates and is approximately 1.5m high. The filter module 2 is typically 1m x 1m in size, and the length and width dimensions of the concrete filter tank 1 are usually integers to facilitate the fabrication and installation of each filter module 2. The filter module 2 includes a steel frame 21 and an internal filter layer structure 22 housed within the steel frame 21. The side walls of the steel frame 21 are enclosed with perforated steel plates, and the top is open. The combination of the steel frame 21 and the internal filter layer structure 22 gives the filter module 2 an independent structure, allowing it to function as an independent operating unit. The perforated steel plate structure of the side walls of the steel frame 21 ensures the air permeability of the filter module 2 and the fluidity of flushing water between the filter modules 2, while the top opening facilitates the entry of water and sludge into the filter module 2 for filtration.

[0039] Reference Figure 3A ceramic filter plate layer 23 is provided at the bottom of the steel frame 21, and the bottom of the ceramic filter plate layer 23 abuts against the support frame 3. The interior of the ceramic filter plate layer 23 is a composite filter plate structure formed by Al2O3 aggregate being wrapped and bonded by molten binder, with through-hole pore channels between the Al2O3 aggregate. These open pore channels result in high filtration speed, low moisture content of the filter media, high strength, and good wear resistance and erosion resistance.

[0040] Reference Figure 2 and Figure 3 The internal filter layer structure 22, from bottom to top, includes a first pebble packing layer 221, a second pebble packing layer 222, and a finished blast furnace slag layer 223, all disposed above the ceramic filter plate layer 23. The particle size distribution of the first pebble packing layer 221 and the second pebble packing layer 222 decreases progressively. That is, the pebble particles in the first pebble packing layer 221 are larger, while those in the second pebble packing layer 222 are smaller. The first pebble packing layer 221 is 100 mm thick, with pebble particles of 4-8 mm in size; the second pebble packing layer 222 is 150 mm thick, with pebble particles of 2-4 mm in size. The pebbles in the first pebble packing layer 221 and the second pebble packing layer 222 can be made of hard, chemically stable rocks, such as granite and basalt.

[0041] Reference Figure 3 The thickness of the second pebble packing layer 222 is greater than that of the first pebble packing layer 221, and the thickness of the finished blast furnace slag layer 223 is greater than that of the second pebble packing layer 222. The thickness of the finished blast furnace slag layer 223 is 200mm. This thickness distribution is also for better filtration. A reasonable setting of the thickness of each layer allows the filter media device to achieve optimal filtration. Because the particle size of the second pebble packing layer 222 is smaller, a thicker layer provides a finer filtration layer, effectively intercepting smaller slag particles and preventing fine slag particles from passing through the lower first pebble packing layer 221, thus improving overall filtration accuracy. The finished blast furnace slag layer 223 is located at the top and plays an important role in preliminary filtration and buffering water flow impact. A thicker finished blast furnace slag layer 223 can accommodate more slag, enhancing the interception capacity for larger slag particles. It also protects subsequent filtration layers, preventing excessive slag from directly impacting the lower second pebble packing layer 222, thus extending the service life of the entire filter module 2.

[0042] Reference Figure 1The support frame 3 has a three-dimensional grid structure, with its grid size matching the outer contour size of a single filter module 2. This three-dimensional grid structure divides the original monolithic filter media layer at the bottom of the ash-filtering tank 1 into multiple filter modules 2, which work in conjunction with the support frame 3. This ensures the filter modules 2 are stably placed on the support frame 3, guaranteeing the stability of the device structure. Furthermore, it allows for rapid, modular, and standardized replacement of different units, making the entire slag filtration process more flexible. Specifically, the support frame 3 can also adopt a modular assembly structure, including several transverse and longitudinal support beams. The transverse and longitudinal support beams are detachably connected via angle steel nodes. The three-dimensional grid structure of the support frame 3 provides excellent stability and load-bearing capacity, ensuring stable support for the filter modules 2.

[0043] The top of the steel frame 21 is fixed with lifting lugs. The purpose of the lifting lugs is to facilitate the hoisting of the filter module 2. The lifting lugs are usually made of high-strength steel and are fixed to the top of the steel frame 21 by welding or bolting. In actual hoisting, the hook of a crane can be used in conjunction with the lifting lugs to easily lift and lower the filter module 2.

[0044] The implementation principle of the replaceable blast furnace bottom filtration slag treatment filter media device in this application embodiment is as follows: the filter media device divides the traditional monolithic filter media layer into multiple independent filter modules 2. Each filter module 2 is supported by a support frame 3 and can be disassembled and hoisted individually. The multi-layer filtration structure within the filter module 2, from the ceramic filter plate layer 23 to the pebble packing layer of different particle sizes and then to the finished blast furnace slag layer 223, can effectively filter water slag. When the filter media of a certain filter module 2 becomes caked or needs to be replaced, the module can be lifted out individually by a crane using the lifting lugs on the top of the steel structure frame 21 for replacement, without the need for large-scale breaking and cleaning of the entire filter media layer. This fundamentally eliminates the problems of large amount of caked cleaning and long maintenance time in the traditional bottom filtration method, reduces the maintenance and repair costs of the slag pool 1, improves replacement efficiency, and does not damage the main structure of the slag pool 1, extending the service life of the slag pool 1, resulting in significant economic benefits.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A replaceable filter media device for blast furnace bottom slag treatment, characterized in that, It includes a filter cake tank (1), multiple independently set filter modules (2) and a support frame (3), and the bottom of the filter cake tank (1) is provided with a return water main pipe interface; The filter module (2) is a prefabricated structure. After the entire assembly is completed, each filter module (2) is installed on the support frame (3). Each of the filter modules (2) can be disassembled and hoisted individually, forming a separable support connection with the support frame (3).

2. The replaceable blast furnace bottom filter slag treatment filter media device according to claim 1, characterized in that, Each filter module (2) includes a steel frame (21) and an internal filter layer structure (22) disposed within the steel frame (21). The side wall of the steel frame (21) is a closed structure with perforated steel plate and an opening at the top. The bottom of the steel frame (21) is provided with a ceramic filter plate layer (23), and the bottom of the ceramic filter plate layer (23) abuts against the support frame (3).

3. The replaceable blast furnace bottom filter slag treatment filter media device according to claim 2, characterized in that, The interior of the ceramic filter plate layer (23) is a composite filter plate layer structure formed by Al2O3 aggregate being wrapped and bonded by molten binder, and the Al2O3 aggregate has through-hole pore channels.

4. A replaceable blast furnace bottom filter slag treatment filter media device according to claim 2, characterized in that, The internal filter layer structure (22) includes, from bottom to top, a first pebble packing layer (221), a second pebble packing layer (222), and a finished blast furnace slag layer (223) disposed above the ceramic filter plate layer (23). The particle size distribution of the first pebble packing layer (221) and the second pebble packing layer (222) is decreasing.

5. A replaceable blast furnace bottom filter slag treatment filter media device according to claim 4, characterized in that, The thickness of the second pebble filler layer (222) is greater than the thickness of the first pebble filler layer (221), and the thickness of the finished blast furnace slag layer (223) is greater than the thickness of the second pebble filler layer (222).

6. A replaceable blast furnace bottom filter slag treatment filter media device according to claim 1, characterized in that, The support frame (3) is a three-dimensional grid structure, and its grid size matches the outer contour size of a single filter module (2).

7. A replaceable blast furnace bottom filter slag treatment filter media device according to claim 2, characterized in that, The top of the steel frame (21) is fixed with a lifting lug.

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