Blast furnace slag flushing water purification system

Abstract

This invention relates to a blast furnace slag flushing water purification system, comprising a collection tank, a storage tank, a recovery pipe, and an output pipe. The collection tank is located at the water quenching station and is used to collect the slag flushing water after water quenching. The storage tank is internally divided into a first tank, a second tank, a third tank, and a fourth tank, which are connected sequentially. The recovery pipe is connected at both ends to the collection tank and the first tank, respectively. One end of the output pipe is connected to the fourth tank, and the other end is located at the water quenching station; the output pipe is used to transport the slag flushing water to the water quenching station. By setting up partitions within the storage tank, the kinetic energy of the slag flushing water is reduced, thus lowering its flow rate. This structure promotes the sedimentation of particulate impurities in the slag flushing water, thereby purifying the water and preventing particulate impurities from re-entering the output pipe and causing wear and blockage to the output pipe, valves, and other equipment.

Description

Technical Field

[0001] This invention relates to the field of blast furnace metallurgical technology, and in particular to a blast furnace slag flushing water purification system. Background Technology

[0002] In the blast furnace ironmaking process, the slag and iron produced during smelting are discharged through slag channels and cooled by water flushing, a process known as slag quenching. The water used for this quenching process is called slag flushing water. After reacting with the slag and iron, the slag flushing water carries a large amount of impurities and harmful substances. To prevent the release of harmful substances from the slag flushing water into the environment, the slag flushing water is always recycled.

[0003] Normally, flushing water is treated by sedimentation in a storage tank before being recycled. Due to the large volume of flushing water required for water quenching, the flow rate is high. Lighter impurities are difficult to completely settle under the strong kinetic energy of the flushing water. Some impurities circulate within the water pipeline, causing wear and blockages in the pipelines, valves, and other equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a blast furnace slag flushing water purification system, which has a good purification effect and can improve the water quality of the slag flushing water.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A blast furnace slag flushing water purification system is provided, comprising:

[0007] A water collection tank is installed at the water quenching station and is used to collect the flushing water after water quenching.

[0008] The water storage tank has three partition walls that are spaced apart inside. The three partition walls divide the water storage tank into a first water tank, a second water tank, a third water tank, and a fourth water tank that are connected in sequence. The flushing water can flow in sequence along the first water tank, the second water tank, the third water tank, and the fourth water tank.

[0009] The recycling pipe is connected at both ends to the water collection tank and the first water tank, respectively.

[0010] An output pipe, one end of which is connected to the fourth water tank and the other end of which is located at the water quenching station, is used to deliver the slag flushing water to the water quenching station.

[0011] Furthermore, a first through hole is provided in the partition wall between the first water tank and the second water tank, and the first through hole is located at the middle position in the depth direction of the water storage tank;

[0012] A second through hole is provided in the partition wall between the second water tank and the third water tank, and the second through hole is located at the middle position in the depth direction of the water storage tank;

[0013] A third through hole is provided in the partition wall between the third water tank and the fourth water tank, and the third through hole is located at the bottom of the water storage tank in the depth direction.

[0014] Furthermore, there are multiple first through holes, multiple second through holes, and multiple third through holes, which are distributed at intervals along the horizontal direction on the corresponding partition walls.

[0015] Furthermore, it also includes a filter tank, the inlet of which is connected to the third water tank via a water supply pipe, and the outlet of which is connected to the fourth water tank via the water supply pipe. The filter tank is provided with a river sand filter layer and / or a coke filter layer.

[0016] Furthermore, a baffle wall is provided inside the filter tank, which divides the filter tank into a first filter tank and a second filter tank. The first filter tank is connected to the second filter tank, and the first filter tank is connected to the third water tank through the water supply pipe. The first filter tank is filled with the river sand filter layer, and the second filter tank is connected to the fourth water tank through the water supply pipe. The second filter tank is filled with the coke filter layer.

[0017] Furthermore, there are two filter tanks, and the two filter tanks are respectively connected to the two opposite tank walls of the third water tank through the water supply pipe.

[0018] Furthermore, it also includes a sterilization container, which is disposed between the filter tank and the fourth water tank. The sterilization container is used to store the flushing water and to perform chemical sterilization treatment on the flushing water.

[0019] Furthermore, the top of the sterilization container is provided with an exhaust pipe, and a burner is provided at the outlet end of the exhaust pipe.

[0020] Furthermore, heat exchange tube assemblies are provided in the first water tank and / or the second water tank.

[0021] Furthermore, it also includes a water supply pipe, which is located at the bottom of the fourth water tank. The water supply pipe has multiple water outlets around its periphery, and the inlet end of the water supply pipe is connected to a water source.

[0022] The advantages of this invention compared to the prior art are:

[0023] This invention discloses a blast furnace slag flushing water purification system. By installing a partition wall inside the water storage tank, the kinetic energy of the slag flushing water is reduced, thus lowering its flow rate. This structure promotes the sedimentation of particulate impurities in the slag flushing water, thereby purifying the water and preventing these impurities from re-entering the output pipe and causing wear and blockage to the output pipe, valves, and other equipment. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of a blast furnace slag flushing water purification system according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of a water storage tank according to an embodiment of the present invention.

[0027] Figure 3 This is a cross-sectional view of the fourth water tank according to an embodiment of the present invention.

[0028] In the picture:

[0029] 1. Water storage tank; 11. First water tank; 12. Second water tank; 13. Third water tank; 14. Fourth water tank; 15. First partition wall; 151. First through hole; 16. Second partition wall; 161. Second through hole; 17. Third partition wall; 171. Third through hole; 2. Output pipe; 3. Water collection tank; 4. Recycling pipe; 5. Filter tank; 50. Baffle wall; 51. First filter tank; 52. Second filter tank; 53. River sand filter layer; 54. Coke filter layer; 6. Water supply pipe; 7. Sterilization container; 8. Exhaust pipe; 9. Water supply pipe; 91. Water outlet. Detailed Implementation

[0030] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] like Figure 1 and Figure 2 As shown, this invention provides a blast furnace slag flushing water purification system for purifying the slag flushing water used in the blast furnace metallurgical process. After blast furnace smelting, the slag and iron produced are discharged through slag channels. When the slag and iron are discharged to the water quenching station, the slag and iron are washed and cooled by the slag flushing water. Under the cooling effect of the slag flushing water, the high-temperature slag and iron rapidly cool down, and the internal stress of the slag and iron causes them to break and form slag and iron particles. After the slag flushing water reacts with the slag and iron, it carries a large amount of particulate impurities and harmful substances.

[0032] The blast furnace slag flushing water purification system includes a water storage tank 1, an output pipe 2, a water collection tank 3, and a recovery pipe 4. The water collection tank 3 is located at the water quenching station and is used to collect the slag flushing water after water quenching the slag and iron. The water storage tank 1 contains the slag flushing water. During its residence in the water storage tank 1, particulate impurities carried in the slag flushing water settle, thus purifying the slag flushing water. Both the output pipe 2 and the recovery pipe 4 are used to transport the slag flushing water. One end of the output pipe 2 is connected to the outlet end of the water storage tank 1, and the other end is located at the water quenching station. The purified slag flushing water in the water storage tank 1 is transported to the water quenching station through the output pipe 2. One end of the recovery pipe 4 is connected to the water collection tank 3, and the other end is connected to the inlet end of the water storage tank 1. The water-quenched slag flushing water is transported back to the water storage tank 1 through the recovery pipe 4.

[0033] The water storage tank 1 is internally divided by three partition walls: a first partition wall 15, a second partition wall 16, and a third partition wall 17. These three partition walls divide the water storage tank 1 into four sequentially arranged water tanks: a first water tank 11, a second water tank 12, a third water tank 13, and a fourth water tank 14. The inlet of the water storage tank 1 is located in the first water tank 11, where one end of the recovery pipe 4 is connected. The first partition wall 15 connects the first water tank 11 and the second water tank 12, and has a first through hole 151, connecting the two tanks. The second partition wall 16 connects the second water tank 12 and the third water tank 13, and has a second through hole 161, connecting the two tanks. The outlet of the water storage tank 1 is located in the fourth water tank 14, where one end of the output pipe 2 is connected. A third partition wall 17 is provided between the third water tank 13 and the fourth water tank 14. A third through hole 171 is provided on the third partition wall 17, and the third water tank 13 and the fourth water tank 14 are connected through the third through hole 171. In the water storage tank 1, the flushing water flows sequentially along the first water tank 11, the second water tank 12, the third water tank 13 and the fourth water tank 14.

[0034] Understandably, by installing a partition wall within the storage tank 1, the kinetic energy of the flushing water can be reduced. When the flushing water enters the first tank 11, its kinetic energy is relatively high, causing it to swirl and flow within the tank. After most of its kinetic energy is reduced by the first partition wall 15, it enters the second tank 12. Under the obstruction of the second partition wall 16, the kinetic energy of the flushing water is further reduced, and its flow velocity decreases, causing particulate impurities in the flushing water to settle in the second tank 12. The third tank 13 and the fourth tank 14 store the flushing water. After sedimentation, the flushing water enters the fourth tank 14 via the third tank 13 and is finally supplied to the water quenching station through the output pipe 2. During the process of the flushing water flowing into the storage tank 1, the kinetic energy and flow velocity of the water are greatly reduced, promoting the sedimentation of particulate impurities in the flushing water, thereby purifying the flushing water and preventing particulate impurities from re-entering the output pipe 2, which could cause wear and blockage to the output pipe 2, valves, and other equipment.

[0035] Optionally, refer to Figure 2As shown in the diagram, the X direction represents the length of the water storage tank 1, the Y direction represents the width of the water storage tank 1, and the Z direction represents the depth of the water storage tank 1. The flushing water flows along the length of the water storage tank 1. There are three first through holes 151, which are distributed horizontally at intervals, meaning they are located at the same depth in the water storage tank 1. The first through holes 151 are located at the middle of the depth direction of the water storage tank 1. There are also three second through holes 161, which are distributed horizontally at intervals, meaning they are located at the same depth in the water storage tank 1. The second through holes 161 are located at the middle of the depth direction of the water storage tank 1. Similarly, there are three third through holes 171, which are distributed horizontally at intervals, meaning they are located at the same depth in the water storage tank 1. The third through holes 171 are located at the bottom of the depth direction of the water storage tank 1. By positioning the first through-hole 151 and the second through-hole 161 at the middle of the depth direction of the water storage tank 1, particulate impurities are facilitated to settle in the bottom areas of the first water tank 11 and the second water tank 12. This also reduces the potential energy of the flushing water in the first and second water tanks 11 and 12, lowers the flow velocity of the flushing water from the first water tank 11 into the second water tank 12, and lowers the flow velocity of the flushing water from the second water tank 12 into the third water tank 13. In practical applications, the demand for flushing water is high during water quenching, and the flow velocity of the flushing water in the output pipe 2 is relatively high, resulting in a rapid drop in the water level in the fourth water tank 14. Positioning the third through-hole 171 at the bottom of the depth direction of the water storage tank 1 increases the potential energy of the flushing water in the third water tank 13, increases the flow velocity of the flushing water entering the fourth water tank 14, and thus rapidly replenishes the water volume in the fourth water tank 14. Simultaneously, the flushing water in the third water tank 13 will still contain a small amount of lighter particulate impurities. The flow rate of the flushing water in the third through hole 171 is relatively high, which can be used to flush the third through hole 171 and prevent particulate impurities from depositing inside the third through hole 171. It should be noted that there are multiple first through holes 151, second through holes 161 and third through holes 171. In other embodiments, other numbers can be set, such as two, four, five, etc.

[0036] Optionally, refer to Figure 3As shown, the blast furnace slag flushing water purification system also includes a water supply pipe 9. The water supply pipe 9 is located at the bottom of the fourth water tank 14. The inlet end of the water supply pipe 9 is connected to a water source, meaning that water is supplied to the entire blast furnace slag flushing water purification system through the water supply pipe 9. It is understood that when the slag and iron temperature is above 1000℃, a large amount of slag flushing water evaporates during the flushing of the high-temperature slag and iron, resulting in continuous loss of slag flushing water from the blast furnace slag flushing water purification system. Therefore, it is necessary to replenish the slag flushing water through the water supply pipe 9. There are multiple water supply pipes 9, spaced apart at the bottom of the fourth water tank 14. Multiple water outlets 91 are provided on the water supply pipe 9, divided into at least two groups. These at least two groups of water outlets 91 are spaced apart along the circumference of the water supply pipe 9, with each group containing multiple water outlets 91. The water outlets 91 in each group are also spaced apart along the length of the water supply pipe 9. The water outlets 91 are located on the side of the water supply pipe 9 closest to the bottom of the fourth water tank 14. During water replenishment, water is sprayed outward through the water outlet 91, which flushes the bottom of the fourth water tank 14. When fine particles in the flushing water settle in the fourth water tank 14, the water replenishment pipe 9 can suspend the settled particles, allowing them to flow back into the first water tank 11 or the second water tank 12 for further settling. This method ensures that no impurities accumulate in the fourth water tank 14, eliminating the need for dedicated sediment cleaning.

[0037] Optionally, refer to Figure 1 As shown, the blast furnace slag flushing water purification system also includes a filter tank 5. The filter tank 5 filters the slag flushing water. A baffle wall 50 is installed inside the filter tank 5, dividing the filter tank 5 into a first filter tank 51 and a second filter tank 52. One end of the baffle wall 50 is connected to the tank wall of the filter tank 5 along its length, while the other end is spaced apart from the tank wall of the filter tank 5, so that the first filter tank 51 and the second filter tank 52 are connected. The inlet of the filter tank 5 is located in the first filter tank 51, and the outlet is located in the second filter tank 52. The inlet of the filter tank 5 is connected to a third water tank 13 through a water supply pipe 6, and the outlet of the filter tank 5 is connected to a fourth water tank 14 through a water supply pipe 6. The slag flushing water in the third water tank 13 can be sequentially transported to the fourth water tank 14 through the first filter tank 51 and the second filter tank 52. A river sand filter layer 53 is installed inside the first filter tank 51, which is formed by the accumulation of river sand. The river sand filter layer 53 filters the flowing slag flushing water to remove fine particulate impurities and slurry-like substances. The second filter tank 52 contains a coke filter layer 54, which includes a steel mesh and coke filled within the mesh. The coke filter layer 54 adsorbs the flowing slag flushing water to remove harmful substances such as sulfides and heavy metals.

[0038] Understandably, the first and second water tanks 11 and 12 can only settle larger particulate impurities in the flushing water. Fine particulate impurities, slurries, and harmful substances cannot settle in the storage tank 1. Therefore, setting up the filter tank 5 to remove fine particulate impurities, slurries, and harmful substances helps to further improve the purification effect of the flushing water and enhance its quality. In practical applications, the flushing water in the third water tank 13 can be filtered periodically, or filtered based on water quality testing data.

[0039] Of course, in other embodiments, only the river sand filter layer 53 or only the coke filter layer 54 may be provided in the filter tank 5. The specific arrangement can be flexibly selected according to the impurity content of the flushing water. For example, when the flushing water in the third water tank 13 contains only harmful substances such as sulfides and heavy metals, only the coke filter layer 54 may be provided in the filter tank 5.

[0040] To ensure the efficiency of the filtration tank 5 in treating the flushing slag water, two filtration tanks 5 are provided. The inlets of the two filtration tanks 5 are connected to the two opposite walls of the third water tank 13 via water supply pipes 6. Correspondingly, the outlets of the two filtration tanks 5 are connected to the fourth water tank 14 via water supply pipes 6. Since the flow velocity of the flushing slag water is relatively slow when flowing through the river sand filter layer 53 and the coke filter layer 54, the number of filtration tanks 5 is increased to ensure the filtration efficiency of the flushing slag water and meet the water supply needs of the fourth water tank 14.

[0041] Optionally, the blast furnace slag flushing water purification system also includes a sterilization container 7, which is located between the filter tank 5 and the fourth water tank 14. The slag flushing water discharged from the filter tank 5 is treated with chemicals in the sterilization container 7 before being transported to the fourth water tank 14. During sterilization, the slag flushing water is left to stand in the sterilization container 7 for 2-3 days, and chemicals are added to remove microorganisms, acidic substances, etc., to further improve the water quality. An exhaust pipe 8 is installed at the top of the sterilization container 7, and a burner is installed at the outlet end of the exhaust pipe 8. The burner is used to incinerate the gas discharged from the exhaust pipe 8 to prevent harmful emissions. In an optional embodiment, the exhaust pipe 8 is connected to the main trough area in front of the blast furnace, and the exhaust gas generated by the sterilization container 7 is incinerated using the gas from the main trough.

[0042] Optionally, the blast furnace slag flushing water purification system also includes heat exchanger tube assemblies (not shown in the figure). Heat exchanger tube assemblies are installed in the first water tank 11 and / or the second water tank 12. It is understood that the slag flushing water is at a high temperature after water quenching, and the heat exchanger tube assemblies absorb the heat of the slag flushing water to achieve heat recovery. Simultaneously, since the heat exchanger tube assemblies are installed in the first water tank 11 and the second water tank 12, the heat exchanger tube assemblies obstruct the slag flushing water, which helps to reduce the flow rate of the slag flushing water and promotes the sedimentation of particulate impurities in the slag flushing water. The heat exchanger tube assemblies are existing technology, and they are arranged in a serpentine pattern, with cooling water flowing inside. The cooling water absorbs heat and becomes hot water for supply to the production site.

[0043] Specifically, in this embodiment, valves for controlling the opening and closing of the pipes are installed on the output pipe 2, the recovery pipe 4, and the water supply pipe 6.

[0044] The significant effect of this embodiment is that by setting up a partition wall inside the water storage tank 1, the kinetic energy of the flushing water is reduced, thereby lowering the flow rate of the flushing water. This structure can promote the sedimentation of particulate impurities in the flushing water, thereby purifying the flushing water and preventing particulate impurities from re-entering the output pipe 2, which could cause wear and blockage to the output pipe 2, valves, and other equipment.

[0045] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A blast furnace slag flushing water purification system, characterized by, The application relates to a water collecting tank arranged at a water quenching station, which is used for collecting water for quenching treatment; a water storage tank, which is internally provided with three partition walls, the three partition walls divide the water storage tank into a first water tank, a second water tank, a third water tank and a fourth water tank which are sequentially communicated, and the water for quenching can sequentially flow along the first water tank, the second water tank, the third water tank and the fourth water tank; a recovery pipeline, which is connected with the water collecting tank and the first water tank at two ends; an output pipeline, which is connected with the fourth water tank at one end and located at the water quenching station at the other end, and is used for conveying the water for quenching to the water quenching station; a first through hole is arranged on the partition wall between the first water tank and the second water tank, and the first through hole is located at a middle position in the depth direction of the water storage tank; a second through hole is arranged on the partition wall between the second water tank and the third water tank, and the second through hole is located at a middle position in the depth direction of the water storage tank; a third through hole is arranged on the partition wall between the third water tank and the fourth water tank, and the third through hole is located at a bottom position in the depth direction of the water storage tank; a filter tank is further arranged, an inlet of the filter tank is communicated with the third water tank through a water conveying pipe, an outlet of the filter tank is communicated with the fourth water tank through the water conveying pipe, and a river sand filter layer and / or a coke filter layer is arranged in the filter tank; a sterilization container is further arranged between the filter tank and the fourth water tank, and is used for storing the water for quenching and performing sterilization treatment on the water for quenching; a baffle is arranged in the filter tank, the baffle divides the filter tank into a first filter tank and a second filter tank, the first filter tank is communicated with the second filter tank, the first filter tank is communicated with the third water tank through the water conveying pipe, the first filter tank is filled with the river sand filter layer, the second filter tank is communicated with the fourth water tank through the water conveying pipe, and the second filter tank is filled with the coke filter layer. The first through hole, the second through hole and the third through hole are multiple, and the multiple first through holes, the multiple second through holes and the multiple third through holes are respectively distributed along the horizontal direction on the corresponding partition walls. The filter tank is two, and the two filter tanks are connected with two tank walls of the third water tank through the water conveying pipes. An exhaust pipe is arranged at the top of the sterilization container, and a burner is arranged at the outlet end of the exhaust pipe. Heat exchange pipes are arranged in the first water tank and / or the second water tank. A water supplement pipeline is arranged at the bottom of the fourth water tank, a plurality of water outlets are arranged on the peripheral part of the water supplement pipeline, and a water source is connected with the inlet end of the water supplement pipeline. ​ ​ ​ ​ ​ 2. The blast furnace slag wash water purification system according to claim 1, characterized in that, ​ 3. The blast furnace slag wash water purification system of claim 1, wherein ​ 4. The blast furnace slag wash water purification system of claim 1, wherein ​ 5. The purifier system for a blast furnace slag flushing water according to any one of claims 1 to 4, characterized by, ​ 6. A blast furnace slag flushing water purification system according to any one of claims 1 to 4, characterized in that ​

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