Blast furnace granulated slag treatment system

Abstract

The invention relates to a blast furnace water granulated slag treatment system, which is applied to the technical field of blast furnace water granulated slag treatment, solves the problems of blockage, influence on water circulation conveying and reduction of deslagging quality caused by easy hardening and slagging of the existing cold water tank and circulating water return assembly, and comprises a sedimentation tank, a filter tank, a hot water tank, a cooling tower, a cold water tank and a circulating water return assembly, the backwashing assembly comprises a first backwashing water pipe, a second backwashing water pipe and a backwashing pump, the water outlet end of the first backwashing water pipe is communicated with the water return pipe and is positioned on one side of the water inlet end of the water return pump, and the water outlet end of the second backwashing water pipe is communicated with the cold water tank; the device has the effects that the water inlets of the cold water tank and the water return pipe can be subjected to backwashing treatment in time, the bottom of the cold water tank and the water inlet of the water return pipe are prevented from hardening and slagging, the flow of pumped water in the blast furnace is not influenced, and the treatment quality of slag in the blast furnace is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of slag treatment, and particularly to a blast furnace slag treatment system. Background Art

[0002] Reference Figure 4 , the existing blast furnace slag treatment system includes a sedimentation tank 1', a filtration tank 2', a hot water tank 3', a cooling tower 4', a cold water tank 5' and a circulating return water assembly 6'. After the slag in the blast furnace is filtered through this slag treatment system, it is stored in the cold water tank 5' for standby. When water is needed in the blast furnace to wash the high-temperature slag, the water in the cold water tank 5' is returned to the blast furnace 8' through the circulating return water assembly 6' for recycling, so as to achieve the purpose of saving water and reducing production costs. During this process, although the slag is filtered through this slag treatment system to separate the cooling water from the slag, small particles of slag are still likely to remain in the water finally stored in the cold water tank 5'. In production, due to the accumulation and hardening of some fine slag in the cold water tank 5', it affects the pumping operation of the return water pump 62'. And since there is water in the cold water tank 5' all year round, it is very difficult to carry out cleaning work. The cold water tank 5' is blocked, affecting the normal operation of the blast furnace 8'. At the same time, the water inlet of the circulating return water assembly 5' is also prone to hardening and slagging, blocking the water inlet, thus affecting the amount of water pumped into the blast furnace 8' by the circulating return water assembly, and further affecting the quality of slag discharge from the blast furnace. Summary of the Invention

[0003] The purpose of the present invention is to provide a blast furnace slag treatment system, which solves the problems that the existing cold water tank and circulating return water assembly are prone to hardening and slagging, causing blockage, affecting the water circulation and transportation, and reducing the slag discharge quality.

[0004] To achieve the above object, the technical solution adopted by the present invention is: The present invention provides a blast furnace slag treatment system, which includes a sedimentation tank, a filtration tank, a hot water tank, a cooling tower, a cold water tank and a circulating return water assembly arranged in sequence along the slag filtration direction. The circulating return water assembly is used to pump the water in the cold water tank into the blast furnace in a circulating manner. The circulating return water assembly includes a return water pipe and a return water pump arranged on the return water pipe. The water inlet of the return water pipe is arranged inside the cold water tank. It further includes an anti-washing assembly. The anti-washing assembly includes a first anti-washing water pipe and a second anti-washing water pipe communicated with the hot water tank. Anti-washing pumps are arranged on both the first anti-washing water pipe and the second anti-washing water pipe. The water outlet end of the first anti-washing water pipe is communicated with the return water pipe and is located on one side of the water inlet end of the return water pump. The water outlet end of the second anti-washing water pipe is communicated with the cold water tank, and the water outlet end of the second anti-washing water pipe extends to the bottom of the cold water tank.

[0005] Further, a flushing coil pipe is arranged at the bottom of the cold water tank, and the water inlet of the flushing coil pipe is communicated with the water outlet of the second backwashing water pipe.

[0006] Further, a water pumping assembly is arranged between the hot water tank and the cooling tower. The water pumping assembly includes a pump water pipe and a water pump arranged on the pump water pipe.

[0007] Further, the number of the water pumping assemblies is three.

[0008] Further, a plurality of partition plates are sequentially arranged along the height of the filter tank from top to bottom. The partition plates divide the filter tank into a plurality of chambers. Through holes communicating adjacent two chambers are arranged on each partition plate. The through holes are arranged at one side edge of the partition plate. The through holes on adjacent two partition plates are arranged staggeredly. The water outlet end of the sedimentation tank is communicated with the chamber at the bottom of the filter tank. The water outlet end of the chamber at the top of the filter tank is communicated with the water inlet end of the hot water tank.

[0009] Further, compensators are arranged on both sides of the inlets and outlets of the backwater pump, the water pump and the backwashing pump.

[0010] Further, a control valve is arranged on the backwater pipe and between the first backwashing water pipe and the backwater pump.

[0011] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: A blast furnace slag water treatment system of the present invention includes a sedimentation tank, a filter tank, a hot water tank, a cooling tower, a cold water tank and a circulating backwater assembly; and further includes a backwashing assembly. The backwashing assembly includes a first backwashing water pipe and a second backwashing water pipe communicated with the hot water tank. Backwashing pumps are arranged on both the first backwashing water pipe and the second backwashing water pipe. The water outlet end of the first backwashing water pipe is communicated with the backwater pipe and is located on one side of the water inlet end of the backwater pump. The water outlet end of the second backwashing water pipe is communicated with the cold water tank, and the water outlet end of the second backwashing water pipe extends to the bottom of the cold water tank. Through the backwashing assembly, the inlets of the cold water tank and the backwater pipe can be timely backwashed to ensure that the bottom of the cold water tank and the inlet of the backwater pipe are not caked or slagged. The backwashing can stir and suspend the fine slag deposited at the bottom of the cold water tank and the caked fine slag at the inlet of the backwater pipe in the cold water tank. Then, the suspended fine slag in the cold water tank enters the blast furnace through the circulating backwater assembly and enters the next cycle, thereby reducing or eliminating the problem of fine slag deposition and not affecting the slag flushing treatment of the blast furnace.

[0012] Further, by arranging the filter tank into a plurality of chambers and connecting them in a circuitous manner, the residence time of the slag water in the sedimentation tank and the filter tank can be increased, so that more slag water can be sedimented in the sedimentation tank and the filter tank, leaving sufficient time for slag scraping and discharging more slag from the slag water system. Description of the Drawings

[0013] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an illustrative rather than restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 is the overall process schematic diagram in the preferred embodiment of the present invention; Figure 2 is the enlarged partial view of the overall process in the preferred embodiment of the present invention; Figure 3 is the structural schematic diagram of the filter tank in the preferred embodiment of the present invention; Figure 4 is the existing water slag treatment system.

[0014] Among them, the reference numerals are explained as follows: 1, sedimentation tank; 2, filter tank; 21, partition board; 22, through hole; 3, hot water tank; 4, cooling tower; 5, cold water tank; 6, circulating return water assembly; 7, water pumping assembly; 71, pump water pipe; 72, water pump; 6, circulating return water assembly; 61, return water pipe; 62, return water pump; 8, blast furnace; 9, backwashing assembly; 91, first backwashing water pipe; 92, second backwashing water pipe; 93, backwashing pump; 10, flushing coil; 12, control valve; 13, compensator. Specific Embodiments

[0015] The technical solutions of the present invention will be described clearly and completely hereinafter with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention fall within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0017] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] Refer to Figure 1 , Figure 2 and Figure 3 , a blast furnace slag treatment system provided by the present invention includes a sedimentation tank 1, a filtration tank 2, a hot water tank 3, a cooling tower 4, a cold water tank 5, and a circulating return water assembly 6 arranged in sequence along the slag filtration direction. A pump water assembly 7 is arranged between the hot water tank 3 and the cooling tower 4. The pump water assembly 7 includes a pump water pipe 71 and a water pump 72 arranged on the pump water pipe 71. The circulating return water assembly 6 includes a return water pipe 61 and a return water pump 62 arranged on the return water pipe 61. The water inlet of the return water pipe 61 is arranged inside the cold water tank 5. The working process of this blast furnace slag treatment system is as follows: The sedimentation tank 1 is used to store the slag discharged from the blast furnace 8 for primary sedimentation. The sedimented water enters the filtration tank 2 for filtration. The filtered water enters the hot water tank 3. Then, the water in the hot water tank 3 is pumped into the cooling tower 4 by the water pump 72 on the pump water pipe 71 for cooling. The cooled water is transported to the cold water tank 5 through a pipeline. Then, the water in the cold water tank 5 is circulated and pumped into the blast furnace 8 by the return water pump 62 on the return water pipe 61 for recycling. The cold water is mixed with the high-temperature slag in the blast furnace 8 to undergo water quenching. The high-temperature slag after water quenching is in small particle form and mixed with water, which is slag. Then, the slag is discharged into the sedimentation tank 1, and the above filtration process is repeated.

[0019] Refer to Figure 1 , Figure 2 and Figure 3 , where there are three pump water assemblies 7. The three pump water assemblies 7 adopt a two-use-one-spare mode. By operating two of the pump water assemblies 7, the water in the hot water tank 3 can be quickly pumped into the cooling tower 4 for cooling and discharged into the cold water tank 5 to ensure the water volume balance of the system and meet the water consumption requirements for subsequent pumping into the blast furnace 8. When one of the pump water assemblies 7 is damaged, the standby pump water assembly 7 works, which is convenient for the repair of the damaged pump water assembly 7.

[0020] Refer to Figure 1 ,Figure 2 and Figure 3 It further includes an anti - flushing assembly 9. The anti - flushing assembly 9 includes a first anti - flushing water pipe 91 and a second anti - flushing water pipe 92 that communicate with the hot water pool 3. Anti - flushing pumps 93 are provided on both the first anti - flushing water pipe 91 and the second anti - flushing water pipe 92. The water outlet end of the first anti - flushing water pipe 91 communicates with the return water pipe 61 and is located on one side of the water inlet end of the return water pump 62. The water outlet end of the second anti - flushing water pipe 92 communicates with the cold water pool 5, and the water outlet end of the second anti - flushing water pipe 92 extends to the bottom of the cold water pool 5. Through the anti - flushing assembly 9, the water inlets of the cold water pool 5 and the return water pipe 61 can be timely subjected to anti - flushing treatment, ensuring that the bottom of the cold water pool 5 and the water inlet of the return water pipe 61 do not become caked or slagged. The anti - flushing can stir and suspend the fine slag deposited at the bottom of the cold water pool 5 and the caked fine slag at the inlet of the return water pipe 61 in the cold water pool 5. Then, the suspended fine slag in the cold water pool 5 enters the blast furnace 8 with the circulating return water assembly 6 and enters the next cycle, thereby reducing or eliminating the problem of fine slag deposition and not affecting the slag flushing treatment of the blast furnace. A scouring coil 10 is provided at the bottom of the cold water pool 5. The water inlet of the scouring coil 10 communicates with the water outlet of the second anti - flushing water pipe 92. Through the scouring coil 10, the bottom of the cold water pool 5 can be better scoured and cleaned. A control valve 12 is provided on the return water pipe 61 between the first anti - flushing water pipe 91 and the return water pump 62. When the water inlet of the return water pipe 61 is subjected to anti - flushing, the control valve 12 is closed at this time to prevent the high - pressure anti - flushing water from entering the return water pump 62 and damaging the return water pump 62.

[0021] Reference Figure 1 、 Figure 2 and Figure 3 Moreover, along the height of the filter tank 2 from top to bottom, a plurality of partitions 21 are successively arranged. The partitions 21 divide the filter tank 2 into a plurality of chambers. Through holes 22 communicating adjacent two chambers are provided on each partition 21. The through holes 22 are arranged at one side edge of the partition 21. The through holes 22 on adjacent two partitions 21 are arranged staggeredly. The water outlet end of the sedimentation tank 1 communicates with the chamber at the bottom of the filter tank 2, and the water outlet end of the top chamber of the filter tank 2 communicates with the water inlet end of the hot water pool 3. This structure of the filter tank 2 can increase the residence time of the water slag in the sedimentation tank 1 and the filter tank 2, allowing more water slag to settle in the sedimentation tank 1 and the filter tank 2, leaving sufficient time for slag scraping and discharging more slag from the water slag system.

[0022] Reference Figure 1 、 Figure 2 and Figure 3 Compensators 13 are provided on both sides of the inlets and outlets of the return water pump 62, the pumping pump 72 and the anti - flushing pump 93. The provided compensators 13 can absorb the vibrations generated during the operation of each pump, improving the stability of this system.

[0023] In summary, the backwashing component 9 can timely perform backwashing treatment on the water inlet of the cold water tank 5 and the return water pipe 61, ensuring that the bottom of the cold water tank 5 and the water inlet of the return water pipe 61 do not become caked or slagged, and will not affect the water inlet flow rate of the pump when the water in the cold water tank 5 is refluxed into the blast furnace 8 through the return water pump 62, improving the quality of slag treatment in the blast furnace 8; by arranging the filter tank 2 into multiple chambers and connecting them in a circuitous manner, the residence time of water slag in the sedimentation tank 1 and the filter tank 2 can be increased, allowing more water slag to settle in the sedimentation tank 1 and the filter tank 2, leaving sufficient time for slag scraping and discharging more slag from the water slag system.

[0024] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A blast furnace slag treatment system, characterized in that: The invention comprises a sedimentation tank (1), a filtering tank (2), a hot water tank (3), a cooling tower (4), a cold water tank (5) and a circulating water return assembly (6) which are arranged in sequence along the slag filtering direction. The circulating water return assembly (6) is used to circulate and pump water in the cold water tank (5) into a blast furnace (8). The circulating water return assembly (6) comprises a water return pipe (61) and a water return pump (62) arranged on the water return pipe (61). The water inlet of the water return pipe (61) is arranged inside the cold water tank (5). The invention also comprises a backwash assembly (9). The backwash assembly (9) comprises a first backwash water pipe (91) and a second backwash water pipe (92) connected to the hot water pool (3), the first backwash water pipe (91) and the second backwash water pipe (92) are both provided with a backwash pump (93), the water outlet end of the first backwash water pipe (91) is connected to the return water pipe (61) and is located on one side of the water inlet end of the return water pump (62), the water outlet end of the second backwash water pipe (92) is connected to the cold water pool (5), and the water outlet end of the second backwash water pipe (92) extends to the bottom of the cold water pool (5).

2. The blast furnace slag treatment system according to claim 1, characterized in that: A flushing coil (10) is provided at the bottom of the cold water pool (5), and a water inlet of the flushing coil (10) is connected to a water outlet of the second backwash water pipe (92).

3. The blast furnace slag treatment system according to claim 1 or 2, characterized in that: A water pump assembly (7) is provided between the hot water pool (3) and the cooling tower (4), wherein the water pump assembly (7) comprises a water pump pipe (71) and a water pump (72) provided on the water pump pipe (71).

4. The blast furnace slag treatment system according to claim 3, characterized in that: The number of the water pumping components (7) is three.

5. The blast furnace slag treatment system according to claim 4, characterized in that: The filter pool (2) is provided with a plurality of partitions (21) in sequence from top to bottom along its height, the partitions (21) dividing the filter pool (2) into a plurality of chambers, each of the partitions (21) is provided with a through hole (22) connecting two adjacent chambers, the through hole (22) is arranged on a side edge of the partition (21), and the through holes (22) on two adjacent partitions (21) are arranged staggered, the water outlet of the sedimentation pool (1) is connected to the chamber at the bottom of the filter pool (2), and the water outlet of the chamber at the top of the filter pool (2) is connected to the water inlet of the hot water pool (3).

6. The blast furnace slag treatment system according to claim 4 or 5, characterized in that: Compensators (12) are provided on both sides of the inlet and outlet of the return water pump (62), the suction pump (72) and the backwash pump (93).

7. The blast furnace slag treatment system according to claim 6, characterized in that: A control valve (13) is provided on the return water pipe (61) and between the first backwash water pipe (91) and the return water pump (62).

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