Filter tank for blast furnace slag treatment

Abstract

The utility model discloses a filter tank for blast furnace slag treatment, which relates to the technical field of blast furnace ironmaking filter residue treatment equipment, and comprises a filter tank structural body, a filter tank body and a filter tank body, the supporting piece divides the containing space into a filtering layer with a filtering material and a water storage layer located below the filtering layer, and the supporting piece supports the filtering material and enables the filtering layer to be communicated with the water storage layer; the upper side of the filter layer is used for piling slag, and the water storage layer is used for storing at least part of filtered water; the back flushing unit is arranged in the water storage layer, and the back flushing unit is used for filling back flushing water into the water storage layer. The filter tank for blast furnace slag treatment provided by the utility model can accurately detect the water level of filtered water, and the local part of the filter material is not easy to harden.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace iron-making slag treatment equipment, in particular to a filter tank for blast furnace slag treatment. Background Art

[0002] The environment-friendly bottom filtration method for blast furnace slag is the mainstream process for blast furnace slag treatment nowadays. During normal production, the water slag system has the functions of intelligently regulating the pumping of the hot water pump in the bottom filter tank and the backwashing of the backwashing pipeline, that is, the signal to stop the pumping of the hot water pump comes from the water level monitoring at the bottom of the filter tank. When the water level height is about 1.5 m at the bottom of the filter tank, a signal is sent to stop the hot water pump. However, in the actual operation process, the water level signal at the bottom of the filter tank often fluctuates violently, resulting in inaccurate stop signals for the hot water pump, premature pump stoppage, leading to too high water content in the slag, and too late pump stoppage, leading to air suction in the hot water pipeline and even damage to the hot water pump equipment, causing certain economic losses. However, in the actual production process, there is still a slag layer of 3-4 m on the 1.5 m filter layer. During the water filtration process, on the one hand, due to the too fast decline of the slag and the water level of the filter layer, it is impossible to accurately measure the water level in the slag, resulting in pressure fluctuations in the hot water pipeline. On the other hand, due to the problem of water slag caking, the water volume detection is inaccurate. When measuring the water level of the existing filter tank, a pressure sensor installed on the main drainage pipe is used to convert the pressure signal into the water head height. The drainage pipe network and its main pipe are buried in the bottom layer of pebble filter materials. The porosity of the lower 1.5 m thick filter materials is small. Local poor water permeability in the filter tank or air intake and surging of the hot water pump, etc., will all affect the pressure value on the main pipe and cannot stably reflect the water level. Therefore, the pump stoppage time often requires manual intervention and it is difficult to achieve accurate automatic pump stoppage. In addition, the existing backwashing pipeline shares the same pipeline with the hot water pipeline, and the backwashing intensity is insufficient at the far end from the side where the backwashing water comes, often resulting in local caking of the pebble slabs, leading to a deterioration of the filtration effect. Content of the Utility Model

[0003] The purpose of the utility model is to provide a filter tank for blast furnace slag treatment that can accurately detect the water level of the filtered water and is not prone to local caking of the filter materials.

[0004] The above object of the utility model can be achieved by the following technical solutions:

[0005] The utility model provides a filter tank for blast furnace slag treatment, including:

[0006] A filter tank structure body, with an accommodation space formed inside;

[0007] A support member, which divides the accommodation space into a filter layer with filter materials and a water storage layer located below the filter layer. The support member supports the filter materials and enables the filter layer to communicate with the water storage layer; the upper side of the filter layer is used for piling up slag, and the water storage layer is used for storing at least part of the filtered water;

[0008] A backwashing unit is arranged in the water storage layer, and the backwashing unit is used to inject backwashing water into the water storage layer.

[0009] Preferably, the backwashing unit includes:

[0010] At least one backwashing main pipe, which extends along the extending direction of the filter tank structure and is located near the inner wall of the filter tank structure;

[0011] A plurality of backwashing branch pipes arranged side by side along the extending direction of the backwashing main pipe are communicated with the backwashing main pipe. The backwashing branch pipes are perpendicular to the backwashing main pipe and are in the same plane. A plurality of backwashing holes are formed on the backwashing branch pipes, and the backwashing water can be injected upward into the filter layer through the backwashing main pipe, the backwashing branch pipes, and the backwashing holes.

[0012] Preferably, the number of the backwashing main pipes is two, and the two backwashing main pipes are respectively arranged near the inner walls on the opposite sides of the filter tank structure;

[0013] Both ends of the backwashing branch pipes are communicated with the two backwashing main pipes respectively.

[0014] Preferably, the backwashing unit further includes two backwashing valve groups, and the two backwashing valve groups are respectively arranged on the two backwashing main pipes to control the opening and closing of the backwashing main pipes.

[0015] Preferably, a sunken pumping groove is formed at the bottom of the filter tank structure, and the pumping groove extends along the extending direction of the filter tank structure;

[0016] The filter tank for blast furnace slag treatment includes a drainage unit. The drainage unit includes a water extraction pipe, and the inlet of the water extraction pipe extends into the pumping groove so that the drainage unit can extract the filtered water in the water storage layer.

[0017] Preferably, the drainage unit further includes a drainage valve group, and the drainage valve group is arranged on the water extraction pipe to control the on-off of the water extraction pipe.

[0018] Preferably, the filter tank for blast furnace slag treatment includes a plurality of water level sensors, and the plurality of water level sensors are circumferentially distributed in the water storage layer. The water level sensors are used to sense the water level of the filtered water in the water storage layer.

[0019] Preferably, the filter tank for blast furnace slag treatment includes a microcontroller, and the microcontroller is signal-connected to the water level sensors. The microcontroller is used to control the opening and closing of the drainage unit according to the water level of the filtered water in the water storage layer.

[0020] Preferably, the filter media includes a plurality of stacked cobblestones.

[0021] Preferably, the height of the water storage layer is 30% to 50% of the height of the filter media in the filter layer.

[0022] The features and advantages of the present utility model are as follows:

[0023] The filter tank for blast furnace slag treatment provided by the embodiment of the present utility model forms a water storage layer in the bottom accommodation space of the filter tank structure body, and the filter layer is arranged on the upper side of the water storage layer. A part of the filtered water can be stored in the water storage layer. Thus, when the water flow in the filter layer changes rapidly, the water level of the filtered water in the water storage layer can still remain relatively stable and is not affected by the filter media in the filter layer, so that the measurement data of the water level sensor is more accurate, and then it is convenient to control the start and stop time of the drainage unit, making the water level control more precise. In addition, by accommodating part of the filtered water in the water storage layer and extending the inlet of the water extraction pipe into the water extraction groove, it can effectively prevent the water pump for drainage from being damaged due to air suction or surging, protecting the safety of the drainage equipment. The backwashing unit arranged in the water storage layer can also effectively improve the backwashing efficiency of the filter layer and prevent the filter layer from caking, thereby ensuring the stability and high efficiency of the overall technological process of the filter tank. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 Shown is the overall structural schematic diagram of the filter tank for blast furnace slag treatment of the present utility model.

[0026] Figure 2 Shown is the top view of the backwashing main pipe and backwashing branch pipes in the filter tank for blast furnace slag treatment of the present utility model.

[0027] Figure 3 Shown is the structural schematic diagram of the water path in the filter tank for blast furnace slag treatment of the present utility model. Detailed Embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0029] Please refer to Figure 1 As shown, the embodiment of the present utility model provides a filter tank for blast furnace slag treatment, including: a filter tank structure body 1, with an accommodation space 11 formed inside; a support member 5, which divides the accommodation space 11 into a filter layer 2 with filter media and a water storage layer 12 located below the filter layer 2. The support member 5 supports the filter media and enables the filter layer 2 to communicate with the water storage layer 12; the upper side of the filter layer 2 is used for piling up slag, and the water storage layer 12 is used for storing at least part of the filtered water; a backwashing unit 3, disposed in the water storage layer 12, and the backwashing unit 3 is used for injecting backwashing water into the water storage layer 12.

[0030] To further illustrate the specific structure of the filter tank for blast furnace slag treatment in the embodiment of the present utility model, the following further explains its specific structure, connection relationship, and dimensional limitations, etc., where:

[0031] Please refer to together Figure 1As shown, the filter tank structure 1 has an accommodation space 11 inside. Among them, the filter tank structure 1 and the accommodation space 11 can extend in a direction perpendicular to the paper surface. The filter tank structure 1 has a bottom wall, two opposite left side walls and right side walls, and two opposite end faces. The support member 5 is arranged in the accommodation space 11. The support member 5 extends horizontally and divides the accommodation space 11 into a filter layer 2 with filter media and a water storage layer 12 located below the filter layer 2. The periphery of the support member 5 is connected to the side wall of the filter tank structure 1, so that the support member 5 can support the filter media. The support member 5 has a large number of hollow structures, so that the filter layer 2 is communicated with the water storage layer 12. The filter layer 2 with filter media is used to filter the slag-water mixture input into the filter tank to achieve slag-water separation, so as to intercept the water slag particles on the upper part of the filter media. Therefore, the upper side of the filter layer 2 is used to stack slag (water slag particles), and the water storage layer 12 is used to store at least part of the filtered water. The backwashing unit 3 is used to be arranged in the water storage layer 12, and the backwashing unit 3 is used to inject backwashing water into the water storage layer 12. The backwashing water rises from the bottom of the filter tank structure 1 to roll up the fine slag precipitated in the filter media in the filter layer. When the backwashing water reaches the preset height of the backwashing water, the backwashing unit stops injecting backwashing water into the water storage layer 12.

[0032] As a feasible solution, Figure 2 The following figure shows a top view of the backwashing main pipe and the backwashing branch pipes in the filter tank for blast furnace slag treatment of the present invention. As Figure 2 As shown, the backwashing unit 3 includes: at least one backwashing main pipe 31, the backwashing main pipe 31 extends along the extending direction of the filter tank structure 1 and is located near the inner wall of the filter tank structure 1; a plurality of backwashing branch pipes 32 arranged side by side along the extending direction of the backwashing main pipe, communicating with the backwashing main pipe 31, the backwashing branch pipes 32 are perpendicular to the backwashing main pipe 31 and the two are in the same plane, and a plurality of backwashing holes 321 are formed on the backwashing branch pipes 32. The backwashing water can be injected upward into the filter layer 2 through the backwashing main pipe 31, the backwashing branch pipes 32, and the backwashing holes 321. Among them, the backwashing main pipe 31 can be located near the left side wall or the right side wall of the filter tank structure 1. The lengths of the left side wall and the right side wall are greater than the length of the end face. By the above method, it can be ensured that sufficient water pressure exists at different positions of the backwashing branch pipes 32, and the problem of low water pressure at the distal end caused by the overlong backwashing branch pipes 32 will not occur. The plurality of backwashing holes 321 are sequentially distributed along the backwashing branch pipes 32, covering the entire length of the backwashing branch pipes 32, so that when the backwashing unit 3 injects backwashing water into the water storage layer, all the filter layers can be covered in the extending direction of the end face.

[0033] In a preferred embodiment, the number of the backwash main pipes 31 is two, and the two backwash main pipes 31 are respectively arranged on the inner walls of the opposite sides of the filter tank structure 1, that is, near the left side wall and the right side wall; both ends of the backwash branch pipes 32 are respectively communicated with the two backwash main pipes 31. In the above way, when the backwash branch pipes 32 are performing backwash water, the flushing intensity of different positions of the whole backwash branch pipes 32 on the filter layer with filter media is relatively uniform, preventing the local filter media from caking and accelerating due to insufficient local backwash intensity.

[0034] Figure 3 The following shows a schematic structural diagram of the water path in the filter tank for blast furnace slag treatment of the present invention. As Figure 3 shown, as feasible, the backwash unit 3 further includes two backwash valve groups 33, and the two backwash valve groups 33 are respectively arranged on the two backwash main pipes 31 to control the opening and closing of the backwash main pipes 31.

[0035] As Figure 1 and Figure 2 shown, a sunken pumping groove 121 can be formed at the bottom of the filter tank structure 1, and the pumping groove 121 extends along the extending direction of the filter tank structure 1. The filter tank for blast furnace slag treatment can include a drainage unit 4. The drainage unit 4 includes a water pumping pipe 41, and the inlet of the water pumping pipe 41 extends into the pumping groove 121 so that the drainage unit 4 can pump the filtered water in the water storage layer 12. The drainage unit 4 can further include a water pump communicated with the water pumping pipe 41. The water pumping pipe 41 can extend into the water storage layer 12 from the end face of the filter tank structure 1 for a short distance, and then, the inlet of the water pumping pipe 41 bends downward and extends into the pumping groove 121. In this way, the backwash unit 3 and the water pumping pipe 41 can be separately arranged in the water storage layer 12, which will not affect the distribution of the backwash branch pipes 32 in the backwash unit 3, and can greatly reduce the risk of air intake in the drainage unit 4.

[0036] As Figure 3 shown, as feasible, the drainage unit 4 further includes a drainage valve group 42, and the drainage valve group 42 is arranged on the water pumping pipe 41 to control the on-off of the water pumping pipe 41.

[0037] As feasible, the filter tank for blast furnace slag treatment can include a plurality of water level sensors, and the plurality of water level sensors are circumferentially distributed in the water storage layer 12. The water level sensors are used to sense the water level of the filtered water in the water storage layer. The setting points of the water level sensors are located in the water storage layer 12 without filter media and far from the inlet of the water pumping pipe 41, which can also improve the relatively accurate and stable measurement of the water level by the water level sensors.

[0038] As a feasible option, the filter tank for blast furnace slag treatment includes a microcontroller, which is signal-connected to a water level sensor. The microcontroller is used to control the opening and closing of the drainage unit according to the water level of the filtered water in the water storage layer 12. By effectively measuring the water level of the filtered water in the water storage layer 12 through the water level sensor, the opening and closing of the drainage unit can be accurately controlled, thereby achieving automatic and intelligent control.

[0039] As a feasible option, the filter media can include multiple stacked cobblestones. The height of the water storage layer 12 can be 30% to 50% of the height of the filter media in the filter layer 2.

[0040] In this application, a control method for the filter tank for blast furnace slag treatment using any of the above is also proposed. The control method can include:

[0041] Input the slag-water mixture formed by quenching the blast furnace molten slag with water into the filter tank, so that the slag-water mixture passes through the filter layer 2 with filter media for slag-water separation. Among them, the water flows into the water storage layer 12, and the water slag particles are intercepted above the filter media. The slag-water mixture formed by quenching the blast furnace molten slag with water enters the filter tank after passing through the slag flushing channel valve 6, and the slag flushing channel valve 6 can be controlled to open and close by the hydraulic power unit 7.

[0042] When the water level sensor detects that the water in the water storage layer 12 rises to a preset height, control the drain valve group 42 and the corresponding water pump in the drainage unit 4 to open, so as to pump out the water in the water storage layer 12 through the water suction pipe in the drainage unit 4.

[0043] During the interval between the completion of blast furnace slag tapping and the next slag tapping, add backwashing water to the water storage layer 12 through the backwashing unit 3. The backwashing water rises from the bottom of the filter tank structure to roll up the fine slag precipitated in the filter media in the filter layer. When the backwashing water reaches the preset height of the backwashing water, stop the backwashing unit 3 from adding backwashing water to the water storage layer 12, so that the filter tank is ready for the next operation.

[0044] Based on the above structural description, the filter tank for blast furnace slag treatment in the embodiment of the present utility model has the following beneficial effects:

[0045] The filter tank for blast furnace slag treatment provided by the embodiment of the present utility model forms a water storage layer 12 in the bottom accommodation space 11 of the filter tank structure 1. The filter layer 2 is arranged on the upper side of the water storage layer 12. A part of the filtered water can be stored in the water storage layer 12. Thus, when the water flow in the filter layer 2 changes rapidly, the water level of the filtered water in the water storage layer 12 can still remain relatively stable and is not affected by the filter media in the filter layer 2, so that the measurement data of the water level sensor is more accurate, and then it is convenient to control the start and stop time of the drainage unit 4, making the water level control more precise. In addition, by accommodating part of the filtered water in the water storage layer 12 and extending the inlet of the water extraction pipe 41 into the water extraction groove 121, it can effectively prevent the water pump for drainage from being damaged due to air suction or surging, protecting the safety of the drainage equipment. The backwashing unit 3 arranged in the water storage layer 12 can also effectively improve the backwashing efficiency of the filter layer 2, prevent the filter layer 2 from caking, and thus ensure the stability and high efficiency of the overall process flow of the filter tank.

[0046] The above are only the embodiments of the present utility model. Those skilled in the art can make various changes or modifications to the embodiments of the present utility model without departing from the spirit and scope of the present utility model according to the content disclosed in the application documents. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of the present application in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. A filter tank for blast furnace slag treatment, characterized in that: include: The filter tank structure has a receiving space formed inside; A support member, wherein the support member divides the accommodation space into a filter layer having filter material and a water storage layer located below the filter layer, the support member supports the filter material and enables the filter layer to communicate with the water storage layer; the upper side of the filter layer is used for stacking slag, and the water storage layer is used for storing at least part of the filtered water; A recoil unit is arranged in the aquifer, and is used for injecting recoil water into the aquifer.

2. The filter tank for blast furnace slag treatment according to claim 1, characterized in that: The recoil unit comprises: At least one recoil main pipe, the recoil main pipe is extended along the extension direction of the filter tank structure and is located near the inner wall of the filter tank structure; A plurality of recoil branch pipes are arranged side by side along the extension direction of the recoil main pipe and are connected to the recoil main pipe. The recoil branch pipes are perpendicular to the recoil main pipe and the two are located in the same plane. A plurality of recoil holes are formed on the recoil branch pipes, and the recoil water can be injected upward into the filter layer through the recoil main pipe, the recoil branch pipes, and the recoil holes.

3. The filter tank for blast furnace slag treatment according to claim 2, characterized in that: There are two recoil main pipes, which are respectively arranged near the inner walls on two opposite sides of the filter tank structure; The two ends of the recoil branch pipe are respectively connected to the two recoil main pipes.

4. The filter tank for blast furnace slag treatment according to claim 3, characterized in that: The backwash unit further comprises two backwash valve groups, and the two backwash valve groups are respectively arranged on the two backwash main pipes to control the opening and closing of the backwash main pipes.

5. The filter tank for blast furnace slag treatment according to claim 1, characterized in that: A concave water pumping groove is formed at the bottom of the filter tank structure, and the water pumping groove extends along the extension direction of the filter tank structure; The filter tank for blast furnace slag treatment includes a drainage unit, and the drainage unit includes a pumping pipe, the inlet of the pumping pipe extends into the pumping groove, so that the drainage unit can extract the filtered water in the aquifer.

6. The filter tank for blast furnace slag treatment according to claim 5, characterized in that: The drainage unit further comprises a drainage valve group, and the drainage valve group is arranged on the water pumping pipe to control the on-off of the water pumping pipe.

7. The filter tank for blast furnace slag treatment according to claim 5, characterized in that: The filter tank for blast furnace slag treatment includes a plurality of water level sensors, which are distributed circumferentially in the aquifer, and the water level sensors are used to sense the water level of the filtered water in the aquifer.

8. The filter tank for blast furnace slag treatment according to claim 7, characterized in that: The filtering pool for blast furnace slag treatment includes a microcontroller, which is signal-connected to the water level sensor. The microcontroller is used to control the opening and closing of the drainage unit according to the water level of the filtered water in the aquifer.

9. The filter tank for blast furnace slag treatment according to claim 1, characterized in that: The filter material comprises a plurality of stacked pebbles.

10. The filter tank for blast furnace slag treatment according to claim 1, characterized in that: The height of the water storage layer is 30% to 50% of the height of the filter material of the filter layer.

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