Filter tank in blast furnace slag treatment system
By incorporating a filter tank structure with partitions and connecting pipes in the blast furnace slag treatment system, combined with an immersion-type liquid level metering device, the problem of inaccurate liquid level detection in the filter tank was solved, ensuring the normal operation of the hot water pump and the safety of the equipment.
Patent Information
- Application Number
- CN202520018271.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-06
AI Technical Summary
The existing blast furnace slag treatment system has inaccurate liquid level detection in the filter tank, which leads to inaccurate hot water pump stop signals, potentially causing excessive water content in the slag or damage to the hot water pump equipment.
A partition is set inside the filter tank shell to form the first and second filter tank receiving cavities, and the liquid level is measured by a connecting pipe and an immersion liquid level metering device, which is independent of the drain pipe to avoid the influence of negative pressure and sludge-water pressure fluctuations.
It enables accurate measurement of the liquid level in the filter tank, avoids air intake of the hot water pump and equipment damage, and ensures stable production operation.
Smart Images
Figure CN223818245U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of blast furnace ironmaking technology, and in particular to a filter pool in a blast furnace slag treatment system. Background Technology
[0002] The environmentally friendly bottom filtration process for blast furnace slag is currently the mainstream technology for blast furnace slag treatment. During normal production, the water-slag system has intelligent control functions for the hot water pump in the bottom filter tank and the backwashing of the backwashing pipes. Specifically, the signal to stop the hot water pump comes from the water level monitoring at the bottom of the filter tank. The pump stops when the water level is approximately 1.5m below the bottom of the filter tank. However, in actual operation, the water level signal at the bottom of the filter tank often fluctuates drastically, causing inaccurate pump stop signals. Stopping the pump too early leads to excessive water content in the slag, while stopping it too late can cause air to be drawn into the hot water pipes or even damage the hot water pump, resulting in economic losses.
[0003] For specific examples, such as Figure 1 As shown, during the production process, if filter tank 200 is in the slag flushing state, filter tank 100 will grab the slag. Before grabbing the slag, filter tank 100 needs to use a hot water pump to draw hot water from the tank to a cooling tower for cooling. During the operation of the hot water pump, the hot water pipe 101 is under negative pressure, and the pressure detection point 102 cannot operate normally, resulting in abnormal readings. At this time, it is impossible to determine the liquid level in filter tank 100. Stopping the pump too early will result in excessive water content in the slag, while stopping the pump too late will cause air to be drawn into the hot water pipe or even damage the hot water pump equipment. Therefore, accurate measurement of the liquid level in the filter tank is crucial to ensure stable production operation. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a filter tank in a blast furnace slag treatment system, which can solve the problem of inaccurate liquid level detection in the filter tank.
[0005] The specific technical solution of this utility model embodiment is as follows:
[0006] A filter tank in a blast furnace slag treatment system, the filter tank in the blast furnace slag treatment system comprising:
[0007] The filter tank shell has a partition, which forms a first filter tank receiving cavity and a second filter tank receiving cavity inside the filter tank shell.
[0008] A first drain pipe connected to the bottom of the first filter tank cavity;
[0009] A second drain pipe connected to the bottom of the second filter tank cavity;
[0010] The first pipe well body is disposed on the side wall of the filter tank shell corresponding to the first filter tank receiving cavity;
[0011] The second pipeline well body is located on the side wall of the filter tank shell corresponding to the second filter tank receiving cavity;
[0012] The first connecting pipe passes through the first pipe well body and extends to the bottom of the first filter tank receiving cavity. A first submersible liquid level metering device is installed in the first connecting pipe.
[0013] The second connecting pipe passes through the second pipe well body and extends to the bottom of the second filter tank receiving cavity, and a second submersible liquid level metering device is installed in the second connecting pipe.
[0014] Preferably, the first filter tank cavity is provided with a first filter screen extending in a horizontal direction, and the inlet of the first drain pipe is located below the first filter screen.
[0015] The second filter tank contains a second filter screen that extends horizontally, and the inlet of the second drain pipe is located below the second filter screen.
[0016] Preferably, the port of the first connecting pipe extending into the first filter tank cavity is located below the first filter screen;
[0017] The port at one end of the second connecting pipe that extends into the second filter tank cavity is located below the second filter screen.
[0018] Preferably, the first immersion liquid level metering device includes a float-type immersion liquid level gauge;
[0019] The second submersible level metering device includes a float-type submersible level gauge.
[0020] Preferably, the bottom of the first filter tank receiving cavity has a downwardly recessed first recess;
[0021] The inlet of the first drain pipe is located in the first recess.
[0022] Preferably, the bottom of the second filter chamber has a downwardly recessed second recess;
[0023] The inlet of the second drain pipe is located in the second recess.
[0024] Preferably, the first connecting pipe located in the first pipe well extends vertically, and the height of the first connecting pipe is higher than the maximum liquid level of the slag and water in the first filter tank containing cavity.
[0025] The second connecting pipe located in the second pipe well extends vertically, and the height of the second connecting pipe is higher than the maximum liquid level of the slag and water in the second filter tank containing cavity.
[0026] Preferably, the filter tank shell is made of concrete.
[0027] Preferably, the first manhole body is made of concrete; the second manhole body is made of concrete.
[0028] Preferably, the first drain pipe is connected to the first water pump, and a first valve is provided on the first drain pipe; the second drain pipe is connected to the second water pump, and a second valve is provided on the second drain pipe.
[0029] The technical solution of this utility model has the following significant beneficial effects:
[0030] With the above structure, the bottom of the filter tank's containment chamber can be connected via a connecting pipe. Water from the lower and middle layers of the slag water in the filter tank's containment chamber can enter a connecting pipe within the manhole. An immersion-type liquid level metering device installed in the connecting pipe within the manhole can measure the liquid level in the connecting pipe within the manhole. Based on the principle of communicating vessels, the liquid level in the filter tank's containment chamber is thus obtained. In this blast furnace slag treatment system, the connecting pipe in the filter tank is independent of the drain pipe and is not affected by the negative pressure generated on the drain pipe when the water pump is operating. Simultaneously, the immersion-type liquid level metering device is unaffected by pressure fluctuations in the slag water within the filter tank's containment chamber or by the presence of fine slag in the water, allowing for accurate and reliable measurement of the liquid level in the filter tank's containment chamber. Attached Figure Description
[0031] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.
[0032] Figure 1 This is a schematic diagram of the structure of a filter tank in the prior art;
[0033] Figure 2 This is a process diagram of the filtration tank in the blast furnace slag treatment system of this utility model embodiment;
[0034] Figure 3 This is a schematic diagram of the structure of the filter tank in the blast furnace slag treatment system of this utility model embodiment.
[0035] The reference numerals in the above figures are as follows:
[0036] 1. Filter tank shell; 11. Divider; 12. First filter tank cavity; 13. Second filter tank cavity; 14. First recess; 15. Second recess; 2. First drain pipe; 3. Second drain pipe; 4. First pipe well; 5. Second pipe well; 6. First connecting pipe; 61. First submersible liquid level metering device; 7. Second connecting pipe; 71. Second submersible liquid level metering device; 8. First filter screen; 9. Second filter screen; 10. Slag flushing ditch; 1001. Slag separation equipment; 100. Filter tank; 101. Hot water pipe; 102. Pressure detection point; 200. Filter tank. Detailed Implementation
[0037] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.
[0038] To address the problem of inaccurate liquid level detection in the filtration tank, this application proposes a filtration tank for a blast furnace slag treatment system. Figure 2 This is a process diagram of the filtration tank in the blast furnace slag treatment system of this utility model embodiment. Figure 3 This is a schematic diagram of the structure of the filter tank in the blast furnace slag treatment system of this utility model embodiment, as shown below. Figure 2 and Figure 3 As shown, the filter tank in the blast furnace slag treatment system may include: filter tank shell 1, first drain pipe 2, second drain pipe 3, first pipeline well body 4, second pipeline well body 5, first connecting pipe 6, and second connecting pipe 7.
[0039] like Figure 2 and Figure 3 As shown, the filter tank shell 1 has a partition 11, forming a first filter tank receiving cavity 12 and a second filter tank receiving cavity 13 within the filter tank shell 1. The partition 11 extends vertically, and the first filter tank receiving cavity 12 and the second filter tank receiving cavity 13 are arranged horizontally within the filter tank shell 1. The upper ends of the first filter tank receiving cavity 12 and the second filter tank receiving cavity 13 are open, thereby receiving the slag water input from the slag flushing ditch 10 through the slag separating device 1001. Considering waterproofing and durability, the filter tank shell 1 can be made of concrete.
[0040] like Figure 2 and Figure 3As shown, the first drain pipe 2 is connected to the bottom of the first filter tank cavity 12. The first drain pipe 2 is used to drain water from the sludge in the first filter tank cavity 12. The second drain pipe 3 is connected to the bottom of the second filter tank cavity 13. The second drain pipe 3 is used to drain water from the sludge in the second filter tank cavity 13. Alternatively, the first drain pipe 2 can be connected to the first water pump, and a first valve can be installed on the first drain pipe 2. The second drain pipe 3 can be connected to the second water pump, and a second valve can be installed on the second drain pipe 3. This method can effectively prevent the first and second water pumps from sucking in air.
[0041] Furthermore, the bottom of the first filter chamber 12 has a downwardly recessed first recess 14; the inlet of the first drain pipe 2 is located in the first recess 14. The bottom of the second filter chamber 13 has a downwardly recessed second recess 15; the inlet of the second drain pipe 3 is located in the second recess 15. In this way, the water in the filter chamber enters the recess and collects before being discharged through the drain pipe, which further prevents the water pump on the drain pipe from sucking in air.
[0042] Furthermore, such as Figure 3 As shown, a first filter screen 8 extending horizontally is installed in the first filter tank cavity 12, and the inlet of the first drain pipe 2 is located below the first filter screen 8. A second filter screen 9 extending horizontally is installed in the second filter tank cavity 13, and the inlet of the second drain pipe 3 is located below the second filter screen 9. This arrangement ensures that the first drain pipe 2 and the second drain pipe 3 minimize the amount of sludge entering the drain pipe during drainage, thus preventing damage to the water pump.
[0043] like Figure 2 and Figure 3 As shown, the first pipe well 4 is located on the side wall of the filter housing 1 corresponding to the first filter housing 12. The second pipe well 5 is located on the side wall of the filter housing 1 corresponding to the second filter housing 13. This structure ensures that the first connecting pipe 6 within the first pipe well 4 can pass through the side wall of the filter housing 1 corresponding to the first filter housing 12 and directly extend into the first filter housing 12, and the second connecting pipe 7 within the second pipe well 5 can pass through the side wall of the filter housing 1 corresponding to the second filter housing 13 and directly extend into the second filter housing 13.
[0044] As an option, such as Figure 2 and Figure 3As shown, the first connecting pipe 6, located within the first pipe well 4, extends vertically, and its height is higher than the maximum liquid level of the sludge and water in the first filter tank cavity 12. Similarly, the second connecting pipe 7, located within the second pipe well 5, extends vertically, and its height is higher than the maximum liquid level of the sludge and water in the second filter tank cavity 13. This design ensures that the connecting pipes have sufficient height, thereby preventing water overflow from the connecting pipes.
[0045] like Figure 3 As shown, the first connecting pipe 6 passes through the first pipe well body 4 and extends to the bottom of the first filter tank cavity 12. A first submersible liquid level metering device 61 is installed in the first connecting pipe 6. The second connecting pipe 7 passes through the second pipe well body 5 and extends to the bottom of the second filter tank cavity 13. A second submersible liquid level metering device 71 is installed in the second connecting pipe 7. Through the above structure, the bottom of the filter tank cavity can be connected through the connecting pipe. The water in the lower and middle layers of the slag water in the filter tank cavity can enter the connecting pipe in the pipe well body through the connecting pipe. The submersible liquid level metering device installed in the connecting pipe in the pipe well body can measure the liquid level in the connecting pipe in the pipe well body. Through the principle of communicating vessels, the liquid level in the filter tank cavity is obtained. In this blast furnace slag treatment system, the connecting pipe in the filter tank is independent of the drain pipe and is not affected by the negative pressure generated by the water pump when it is working. At the same time, the submersible liquid level metering device is not affected by the pressure fluctuation of the slag water in the filter tank cavity or the fine slag contained in the water, and can accurately and reliably measure the liquid level in the filter tank cavity.
[0046] In one alternative embodiment, the first submersible level metering device 61 may include a float-type submersible level gauge. The second submersible level metering device 71 may also include a float-type submersible level gauge.
[0047] In an optional implementation, to minimize the entry of fine sludge from the sludge solution into the connecting pipes, such as... Figure 3 As shown, the port of the first connecting pipe 6 that extends into the first filter tank cavity 12 is located below the first filter screen 8. The port of the second connecting pipe 7 that extends into the second filter tank cavity 13 is located below the second filter screen 9.
[0048] like Figure 2As shown, the blast furnace slag treatment system includes a slag flushing ditch 10 for discharging slag hydrate. A liquid separator is installed at the end of the slag flushing ditch 10 to receive the slag hydrate discharged from the ditch. The liquid separator can be controlled to direct the slag hydrate discharged into either the first filter chamber 12 or the second filter chamber 13. For example, the liquid separator can be rotated or moved to control the position of its outlet, ensuring that the discharged slag hydrate is directed into either the first filter chamber 12 or the second filter chamber 13.
[0049] During normal production, the blast furnace slag treatment system operates with one of its two filtration chambers working (receiving slag water) while the other handles slag to discharge the filtered slag. The two chambers are used alternately, and waterless slag handling can be employed. During the flushing process, when the submersible level meter detects that the water level in the filtration chamber is higher than the top elevation of the filter media on the filter screen, the corresponding valves and water pumps can be opened to drain the water from the filtration chamber while maintaining a certain water level to prevent air intake by the water pumps.
[0050] When the flushing process is stopped, if the water level in the filter tank cavity detected by the submersible level metering device is lower than the top elevation of the filter media on the filter screen, the corresponding valve and water pump can be closed. After that, the gantry crane can carry water to grab the slag and send a signal to stop flushing.
[0051] When the submersible liquid level meter detects that the water level in the filter tank is lower than the elevation of the filter screen, it can shut off the corresponding valve and water pump and issue an alarm signal, thereby preventing the water in the filter tank from being emptied and causing air to enter the water pump, which would result in cavitation.
[0052] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.
[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A filter tank in a blast furnace slag treatment system, characterized in that, The filtration tank in the blast furnace slag treatment system includes: The filter tank shell has a partition, which forms a first filter tank receiving cavity and a second filter tank receiving cavity inside the filter tank shell. A first drain pipe connected to the bottom of the first filter tank cavity; A second drain pipe connected to the bottom of the second filter tank cavity; The first pipe well body is disposed on the side wall of the filter tank shell corresponding to the first filter tank receiving cavity; The second pipeline well body is located on the side wall of the filter tank shell corresponding to the second filter tank receiving cavity; The first connecting pipe passes through the first pipe well body and extends to the bottom of the first filter tank receiving cavity. A first submersible liquid level metering device is installed in the first connecting pipe. The second connecting pipe passes through the second pipe well body and extends to the bottom of the second filter tank receiving cavity, and a second submersible liquid level metering device is installed in the second connecting pipe.
2. The filter tank in the blast furnace slag treatment system according to claim 1, characterized in that, The first filter tank cavity is provided with a first filter screen extending in the horizontal direction, and the inlet of the first drain pipe is located below the first filter screen. The second filter tank contains a second filter screen that extends horizontally, and the inlet of the second drain pipe is located below the second filter screen.
3. The filter tank in the blast furnace slag treatment system according to claim 2, characterized in that, The port at one end of the first connecting pipe that extends into the first filter tank cavity is located below the first filter screen; The port at one end of the second connecting pipe that extends into the second filter tank cavity is located below the second filter screen.
4. The filter tank in the blast furnace slag treatment system according to claim 1, characterized in that, The first submersible liquid level metering device includes a float-type submersible liquid level gauge; The second submersible level metering device includes a float-type submersible level gauge.
5. The filter tank in the blast furnace slag treatment system according to claim 1, characterized in that, The bottom of the first filter tank receiving cavity has a downwardly recessed first recess; The inlet of the first drain pipe is located in the first recess.
6. The filter tank in the blast furnace slag treatment system according to claim 1, characterized in that, The bottom of the second filter chamber has a downwardly recessed second recess. The inlet of the second drain pipe is located in the second recess.
7. The filter tank in the blast furnace slag treatment system according to claim 1, characterized in that, The first connecting pipe located in the first pipe well extends vertically, and the height of the first connecting pipe is higher than the maximum liquid level of the slag and water in the first filter tank containing cavity. The second connecting pipe located in the second pipe well extends vertically, and the height of the second connecting pipe is higher than the maximum liquid level of the slag and water in the second filter tank containing cavity.
8. The filter tank in the blast furnace slag treatment system according to claim 1, characterized in that, The filter tank shell is made of concrete.
9. The filter tank in the blast furnace slag treatment system according to claim 8, characterized in that, The first manhole is made of concrete; the second manhole is made of concrete.
10. The filter tank in the blast furnace slag treatment system according to claim 1, characterized in that, The first drain pipe is connected to the first water pump, and a first valve is installed on the first drain pipe; the second drain pipe is connected to the second water pump, and a second valve is installed on the second drain pipe.