Filtering and recycling system for blast furnace granulated slag

Abstract

The utility model discloses a blast furnace water slag filtering and recycling system, which belongs to the technical field of blast furnace water slag flushing, and aims to solve the problem that the liquid level height in a filter tank is difficult to measure in the prior art. The blast furnace water slag filtering and recycling system comprises a filter tank (1), a drainage pipeline (2) and a water pump (3) which are connected in sequence, and the upper end of the filter tank (1) is connected with a flue gas collecting cover (9); the blast furnace granulated slag filtering and recycling system further comprises a water storage tank (4), the water storage tank (4) is connected with the filtering basin (1) or the drainage pipeline (2) through a communicating pipe (5), and water in the filtering basin (1) can enter the water storage tank (4) through the communicating pipe (5). According to the blast furnace water slag filtering and recycling system, the liquid level in the filtering tank is obtained by measuring the liquid level in the water storage tank according to the principle of communicating vessels, the requirement of a blast furnace slag water treatment system for accurate measurement of the liquid level in the filtering tank can be met, air is prevented from entering a filtering pipe and an upper tower pump, and equipment is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace water slagging, in particular to a blast furnace water slag filtering and recycling system. Background Technique

[0002] The molten slag of the blast furnace is granulated and flushed into water slag in front of the furnace. The water slag enters the filtration tank through the slag flushing ditch in front of the furnace. The flushing water is pumped to the cooling tower for cooling in the filtration tank, and the cooling water is circulated back to the slag flushing in front of the furnace through the pump to complete a cycle of slag flushing water circulation.

[0003] Filter pipes are arranged at the bottom of the filtration tank. The filter pipes are composed of a main filter pipe and branch pipes. The main filter pipe is connected to the water pump, and the filter pipes are buried in the filter layer of the filtration tank. In order to grab the water slag with low water content, it is necessary to control the liquid level in the filtration tank to be lower than the upper surface of the filter layer. Also, in order to prevent the water level in the filtration tank from being lower than the main filter pipe and causing the water pump to inhale air, the filtration tank needs to be equipped with a liquid level measurement to monitor the liquid level in the filtration tank.

[0004] In the current bottom filtration process, in order to measure the liquid level in the filtration tank, the method of converting and reading the pipeline pressure of the main filter pipe is generally used to judge the liquid level in the filtration tank. The pressure gauge is installed on the main filter pipe in the pump house. When the liquid level in the tank is lower than the upper surface of the pipeline, air will enter the pipeline, causing pipeline vibration and water pump air intake. Also, because the water pipe is very close to the water pump suction port, the vibration generated by the water pump air intake will also increase the vibration of the pipeline, resulting in the inability of the pressure gauge to read normally and accurately grasp the liquid level situation in the filtration tank. Content of the Utility Model

[0005] In order to solve the problem of difficulty in measuring the liquid level height in the filtration tank in the prior art, the utility model provides a blast furnace water slag filtering and recycling system and its working method. The blast furnace water slag filtering and recycling system utilizes the principle of a communicating vessel to obtain the liquid level in the filtration tank by measuring the liquid level in the storage tank, which can meet the accurate demand of the blast furnace slag water treatment system for measuring the liquid level in the filtration tank, protect the filter pipes and the upper tower pump from entering air, and prevent damage to the equipment.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A blast furnace water slag filtering and recycling system includes a filtration tank, a drainage pipeline and a water pump connected in sequence. A flue gas collection hood is connected to the upper end of the filtration tank, and the flue gas collection hood is connected to a driving mechanism. The driving mechanism can move or rotate the flue gas collection hood relative to the filtration tank. The blast furnace water slag filtering and recycling system also includes a storage tank. The storage tank is connected to the filtration tank or the drainage pipeline through a connecting pipe. The water in the filtration tank can enter the storage tank through the connecting pipe, and the liquid level height in the filtration tank can be the same as the liquid level height in the storage tank. The storage tank is equipped with a liquid level detection device, and the liquid level detection device can detect the liquid level height in the storage tank.

[0008] A part of the drain pipe is located inside the filtration tank, and another part of the drain pipe is located outside the filtration tank. The inlet end of the connecting pipe is connected to the other part of the drain pipe.

[0009] The outlet end of the connecting pipe is connected to the lower part of the water storage tank. A control valve is provided on the drain pipe, and the control valve is located between the inlet end of the connecting pipe and the inlet end of the water pump.

[0010] The filtration tank contains a filtration layer and a drainage ditch. The upper end of the water storage tank is flush with the upper end of the filtration tank, and the lower end of the water storage tank is flush with the lower end of the drainage ditch.

[0011] The blast furnace slag filtration and recovery system further includes a control unit. The liquid level detection device includes a first liquid level switch, a second liquid level switch, a third liquid level switch, and a fourth liquid level switch arranged in sequence from top to bottom. The first liquid level switch is located at the highest liquid level, the second liquid level switch is located at the liquid level for the water pump to stop working, the third liquid level switch is located at the lowest liquid level, and the fourth liquid level switch is located at the accident liquid level.

[0012] The filtration tank is connected to a water replenishment system. The water pump, the first liquid level switch, the second liquid level switch, the third liquid level switch, and the fourth liquid level switch are all connected to the control unit. When the liquid level in the water storage tank reaches the second liquid level switch, the control unit can control the water pump to shut down; when the liquid level in the water storage tank reaches the fourth liquid level switch, the control unit can not only control the water pump to shut down, but also control the water replenishment system to replenish water into the filtration tank.

[0013] The blast furnace slag filtration and recovery system further includes a control unit. The filtration tank is connected to a water replenishment system. The liquid level detection device includes a liquid level gauge. The highest liquid level, the liquid level for the water pump to stop working, the lowest liquid level, and the accident liquid level are stored in the control unit.

[0014] When the liquid level in the water storage tank reaches the liquid level for the water pump to stop working, the control unit can control the water pump to shut down; when the liquid level in the water storage tank reaches the accident liquid level, the control unit can not only control the water pump to shut down, but also control the water replenishment system to replenish water into the filtration tank.

[0015] The blast furnace slag filtration and recovery system further includes a pump house. The water pump and the water storage tank are both located in the pump house. The upper end of the water storage tank is a closed structure, and an exhaust valve is provided at the upper end of the water storage tank.

[0016] The blast furnace slag filtration and recovery system further includes a cooling tower. The water pump is connected to the cooling tower through a water delivery pipe, and the water pump can transport the water in the filtration tank to the inside of the cooling tower.

[0017] The beneficial effects of the present utility model are as follows: The blast furnace slag filtration and recovery system utilizes the principle of a communicating vessel to obtain the liquid level in the filtration tank by measuring the liquid level in the storage water tank, which can meet the requirement of accurate liquid level measurement in the filtration tank of the blast furnace slag water treatment system, protect the filter pipes and the upper tower pumps from entering air, and prevent equipment damage. Brief Description of the Drawings

[0018] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0019] Figure 1 It is a schematic diagram of the blast furnace slag filtration and recovery system of the present utility model.

[0020] Figure 2 It is a schematic diagram of the storage water tank.

[0021] Description of the Reference Numerals in the Drawings:

[0022] 1. Filtration tank; 2. Drainage pipe; 3. Water pump; 4. Storage water tank; 5. Connecting pipe; 6. Control unit; 7. Cooling tower; 8. Pump house; 9. Flue gas collection hood;

[0023] 11. Filter layer; 12. Drainage ditch;

[0024] 21. Control valve;

[0025] 31. Water delivery pipe;

[0026] 41. Liquid level detection device; 42. Exhaust valve;

[0027] 411. First liquid level switch; 412. Second liquid level switch; 413. Third liquid level switch; 414. Fourth liquid level switch. Detailed Embodiment

[0028] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] For the convenience of understanding and description, the following description of the present utility model adopts absolute positional relationships. Without special instructions, the orientation word "up" represents Figure 1 the upper side direction in Figure 1 the orientation word "down" represents Figure 1 the lower side direction in Figure 1 the orientation word "left" represents Figure 1the paper surface and points in the direction of the inner side of the paper surface. The orientation word "rear" means perpendicular to Figure 1 the paper surface and points in the direction of the outer side of the paper surface. The present utility model is described from the observation perspective of the reader or user, but the above orientation words should not be understood or interpreted as limiting the protection scope of the present utility model. Regarding the dimensions and angles of the components therein, those skilled in the art can specifically determine them according to actual needs or through a limited number of experiments.

[0030] As Figure 1 and Figure 2 shown, a blast furnace slag filtering and recycling system described in an embodiment of the present utility model includes a filtering tank 1, a drainage pipe 2 and a water pump 3 connected in sequence. A flue gas collection hood 9 is connected to the upper end of the filtering tank 1. The flue gas collection hood 9 is connected with a driving mechanism, and the driving mechanism can make the flue gas collection hood 9 move or rotate relative to the filtering tank 1. The blast furnace slag filtering and recycling system further includes a water storage tank 4. The water storage tank 4 is connected to the filtering tank 1 or the drainage pipe 2 through a connecting pipe 5. The water in the filtering tank 1 can enter the water storage tank 4 through the connecting pipe 5, and the liquid level height in the filtering tank 1 can be the same as the liquid level height in the water storage tank 4. The water storage tank 4 is provided with a liquid level detection device 41, and the liquid level detection device 41 can detect the liquid level height in the water storage tank 4.

[0031] The water storage tank 4, the connecting pipe 5 and the filtering tank 1 form a communicating vessel. The filtered water in the filtering tank 1 can be discharged through the drainage pipe 2 and the water pump 3. The filtered water in the filtering tank 1 can also enter the water storage tank 4 through the connecting pipe 5. The liquid level height in the filtering tank 1 is the same as the liquid level height in the water storage tank 4, that is, the liquid level in the filtering tank 1 and the liquid level in the water storage tank 4 are in the same horizontal plane. The blast furnace slag filtering and recycling system utilizes the principle of the communicating vessel to obtain the liquid level in the filtering tank 1 by measuring the liquid level in the water storage tank 4, which can meet the requirement of accurate liquid level measurement in the filtering tank of the blast furnace slag treatment system. It protects the drainage pipe 2 and the water pump 3 from entering air and avoids damaging the equipment. The blast furnace slag filtering and recycling system has a simple structure and is easy to maintain.

[0032] As Figure 1 and Figure 2 shown, the water storage tank 4 is located outside the filtering tank 1. A part of the drainage pipe 2 is located inside the filtering tank 1, and the other part of the drainage pipe 2 is located outside the filtering tank 1. The part of the drainage pipe 2 located inside the filtering tank 1 can be called the internal section of the drainage pipe 2, and the other part of the drainage pipe 2 can be called the external section of the drainage pipe 2.

[0033] The driving mechanism can adopt existing technology products. For example, when the driving mechanism can move the flue gas collection hood 9 relative to the filtration tank 1, the driving mechanism can include a motor, wheels, and tracks connected in sequence. After the driving mechanism moves or rotates the flue gas collection hood 9 relative to the filtration tank 1, the upper end of the filtration tank 1 is in an open state to facilitate slag grabbing.

[0034] The connecting pipe 5 is connected to another part of the drainage pipe 2, and the connecting pipe 5 is connected to the external section of the drainage pipe 2. Another part of the drainage pipe 2 can be in a horizontal state. The inlet end of the drainage pipe 2 is located inside the filtration tank 1, and the outlet end of the drainage pipe 2 is connected to the water pump 3.

[0035] The inlet end of the connecting pipe 5 is connected to the external section of the drainage pipe 2, the outlet end of the connecting pipe 5 is connected to the lower part of the water storage tank 4, and a control valve 21 is provided on the drainage pipe 2. The control valve 21 is located on the external section of the drainage pipe 2 and is between the inlet end of the connecting pipe 5 and the inlet end of the water pump 3.

[0036] As Figure 1 shown, the filtration tank 1 contains a filtration layer 11 and a drainage ditch 12 arranged vertically. The internal section of the drainage pipe 2 is located in the drainage ditch 12. The filtration tank 1 and the water storage tank 4 are arranged at a left-right interval. Preferably, the upper end of the water storage tank 4 is flush with the upper end of the filtration tank 1, and the lower end of the water storage tank 4 is flush with the lower end of the drainage ditch 12.

[0037] The liquid level detection device 41 can adopt multiple existing liquid level switches. For example, the liquid level detection device 41 includes a first liquid level switch 411, a second liquid level switch 412, a third liquid level switch 413, and a fourth liquid level switch 414 arranged in sequence from top to bottom. The first liquid level switch 411 is located at the highest liquid level, the second liquid level switch 412 is located at the liquid level when the water pump stops working, the third liquid level switch 413 is located at the lowest liquid level, and the fourth liquid level switch 414 is located at the accident liquid level.

[0038] The highest liquid level is 0 m - 0.2 m below the upper surface of the filtration layer 11. The liquid level when the water pump stops working is 0.3 m - 0.55 m below the upper surface of the filtration layer 11. The lowest liquid level is 0.5 m above the lower surface of the filtration layer 11. The accident liquid level is between the lower end face and the upper end face of the drainage ditch 12. The height (or thickness) of the filtration layer 11 can be about 1.5 m.

[0039] As Figure 1 and Figure 2 shown, the blast furnace slag filtration and recovery system further includes a control unit 6. The filtration tank 1 is connected to a water replenishment system. The switch valve of the water replenishment system, the control valve 21, the water pump 3, the first liquid level switch 411, the second liquid level switch 412, the third liquid level switch 413, and the fourth liquid level switch 414 are all connected to the control unit 6.

[0040] When the liquid level in the water storage tank 4 is at the first liquid level switch 411, the second liquid level switch 412, the third liquid level switch 413 or the fourth liquid level switch 414, correspondingly, the first liquid level switch 411, the second liquid level switch 412, the third liquid level switch 413 or the fourth liquid level switch 414 can send a signal to the control unit 6.

[0041] When the blast furnace slag filtration and recovery system operates normally, the liquid level (i.e., water level) in the filtration tank 1 is higher than the highest liquid level, and the liquid level (i.e., water level) in the water storage tank 4 is also higher than the highest liquid level. When the liquid level in the water storage tank 4 drops to reach the second liquid level switch 412, the control unit 6 can control the water pump 3 to shut down; when the liquid level in the water storage tank 4 drops to reach the fourth liquid level switch 414, the control unit 6 can not only control the water pump 3 to shut down, but the control unit 6 can also control the water replenishing system to replenish water into the filtration tank 1 to raise the liquid level in the filtration tank 1.

[0042] Alternatively, the liquid level detection device 41 includes a liquid level gauge. The liquid level gauge can adopt an existing submersible liquid level gauge or an ultrasonic liquid level gauge. The liquid level gauge can detect the liquid level height in the water storage tank 4 in real time. The specific positions of the highest liquid level, the water pump working shutdown liquid level, the lowest liquid level and the accident liquid level are stored in the control unit 6. When the liquid level in the water storage tank 4 reaches the water pump working shutdown liquid level, the control unit 6 can control the water pump 3 to shut down; when the liquid level in the water storage tank 4 reaches the accident liquid level, the control unit 6 can not only control the water pump 3 to shut down, but the control unit 6 can also control the water replenishing system to replenish water into the filtration tank 1.

[0043] The blast furnace slag filtration and recovery system further includes a pump house 8 and a central control room. The filtration tank 1 and the pump house 8 are arranged at intervals left and right. The water pump 3 and the water storage tank 4 are both located in the pump house 8. The upper end of the water storage tank 4 is a closed structure. An exhaust valve 42 is arranged at the upper end of the water storage tank 4. The gas in the water storage tank 4 can be discharged through the exhaust valve 42, and the outside gas can also enter the water storage tank 4 through the exhaust valve 42. The control unit 6 is located in the central control room.

[0044] As Figure 1 shown, the blast furnace slag filtration and recovery system further includes a cooling tower 7. The water pump 3 is connected to the cooling tower 7 through a water delivery pipe 31, that is, the outlet end of the water pump 3 is connected to the inlet end of the cooling tower 7 through the water delivery pipe 31. The water pump 3 can transport the filtered water in the filtration tank 1 to the cooling tower 7.

[0045] The working method of the above blast furnace slag filtration and recovery system is introduced below. The working method of the blast furnace slag filtration and recovery system includes the following steps:

[0046] The filter tank 1 filters the slag flushing water. The filtered water drainage pipe 2 and the water pump 3 in the filter tank 1 discharge the water and enter the cooling tower 7. The filtered water in the filter tank 1 also enters the water storage tank 4 through the connecting pipe 5. The liquid level height in the filter tank 1 is the same as that in the water storage tank 4.

[0047] When the blast furnace slag filtration and recovery system operates normally, the liquid level in the filter tank 1 is higher than the highest liquid level. When the liquid level in the water storage tank 4 drops to reach the second liquid level switch 412, the control unit 6 controls the water pump 3 to shut down and stop working. When the liquid level in the water storage tank 4 drops to reach the fourth liquid level switch 414, the control unit 6 not only controls the water pump 3 to shut down, but also controls the water replenishing system to replenish water into the filter tank 1.

[0048] As mentioned above, the above are only specific embodiments of the present utility model, and the scope of implementation of the utility model cannot be limited by them. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the present utility model, should still fall within the scope covered by the present utility model. In addition, the technical features in the present utility model can be freely combined with each other between technical features, between technical features and technical solutions, and between technical solutions.

Claims

1. A blast furnace slag filtering and recovery system, characterized in that: The blast furnace slag filtering and recovery system comprises a filter pool (1), a drainage pipe (2) and a water pump (3) which are connected in sequence. The upper end of the filter pool (1) is connected to a smoke collection hood (9). The smoke collection hood (9) is connected to a driving mechanism. The driving mechanism can move or rotate the smoke collection hood (9) relative to the filter pool (1). The blast furnace slag filtering and recovery system also comprises a water storage tank (4). The water storage tank (4) is connected to the filter pool (1) or the drainage pipe (2) through a connecting pipe (5). Water in the filter pool (1) can enter the water storage tank (4) through the connecting pipe (5). The liquid level in the filter pool (1) can be the same as the liquid level in the water storage tank (4). The water storage tank (4) contains a liquid level detection device (41). The liquid level detection device (41) can detect the liquid level in the water storage tank (4).

2. The blast furnace slag filtering and recovery system according to claim 1, characterized in that: A portion of the drainage pipe (2) is located inside the filter pool (1), another portion of the drainage pipe (2) is located outside the filter pool (1), and the inlet end of the connecting pipe (5) is connected to the other portion of the drainage pipe (2).

3. The blast furnace slag filtering and recovery system according to claim 2, characterized in that: The outlet end of the connecting pipe (5) is connected to the lower part of the water storage tank (4), and a control valve (21) is provided on the drainage pipe (2). The control valve (21) is located between the inlet end of the connecting pipe (5) and the inlet end of the water pump (3).

4. The blast furnace slag filtering and recovery system according to claim 1, characterized in that: The filter pool (1) contains a filter layer (11) and a drainage ditch (12); the upper end of the water storage tank (4) is flush with the upper end of the filter pool (1); and the lower end of the water storage tank (4) is flush with the lower end of the drainage ditch (12).

5. The blast furnace slag filtering and recovery system according to claim 1, characterized in that: The blast furnace slag filtering and recovery system also includes a control unit (6), and the liquid level detection device (41) includes a first liquid level switch (411), a second liquid level switch (412), a third liquid level switch (413) and a fourth liquid level switch (414) which are arranged in sequence from top to bottom, the first liquid level switch (411) is located at the highest liquid level, the second liquid level switch (412) is located at the water pump working stop liquid level, the third liquid level switch (413) is located at the lowest liquid level, and the fourth liquid level switch (414) is located at the accident liquid level.

6. The blast furnace slag filtering and recovery system according to claim 5, characterized in that: The filter pool (1) is connected to a water replenishment system; the water pump (3), the first liquid level switch (411), the second liquid level switch (412), the third liquid level switch (413) and the fourth liquid level switch (414) are all connected to a control unit (6); when the liquid level in the water storage tank (4) reaches the second liquid level switch (412), the control unit (6) can control the water pump (3) to shut down; when the liquid level in the water storage tank (4) reaches the fourth liquid level switch (414), the control unit (6) can not only control the water pump (3) to shut down, but also control the water replenishment system to replenish water into the filter pool (1).

7. The blast furnace slag filtering and recovery system according to claim 1, characterized in that: The blast furnace slag filtering and recovery system also includes a control unit (6), the filter tank (1) is connected to a water replenishment system, the liquid level detection device (41) includes a liquid level meter, and the control unit (6) stores the highest liquid level, the water pump shutdown liquid level, the lowest liquid level and the accident liquid level.

8. The blast furnace slag filtering and recovery system according to claim 7, characterized in that: When the liquid level in the water storage tank (4) reaches the water pump shutdown level, the control unit (6) can control the water pump (3) to shut down; when the liquid level in the water storage tank (4) reaches the emergency level, the control unit (6) can not only control the water pump (3) to shut down, but also control the water replenishment system to replenish water into the filter pool (1).

9. The blast furnace slag filtering and recovery system according to claim 1, characterized in that: The blast furnace slag filtering and recovery system also includes a water pump room (8), wherein the water pump (3) and the water storage tank (4) are both located in the water pump room (8), the upper end of the water storage tank (4) is a closed structure, and an exhaust valve (42) is provided at the upper end of the water storage tank (4).

10. The blast furnace slag filtering and recovery system according to claim 1, characterized in that: The blast furnace slag filtering and recovery system also includes a cooling tower (7). The water pump (3) is connected to the cooling tower (7) via a water pipe (31). The water pump (3) can transport water in the filter pool (1) to the cooling tower (7).

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