Steel plant circulating water quality treatment system

Abstract

The utility model discloses a steel plant circulating water quality treatment system which comprises a water inlet pipe, a treatment tank and a water outlet pipe, the treatment tank is divided into a descaling chamber, a decontamination chamber, an organic matter treatment chamber and a filtering chamber, a plurality of cathode bars and anode bars are vertically arranged in the descaling chamber, a water inlet branch pipe is arranged on the water inlet pipe, and a filter is arranged on the water inlet branch pipe. A motor is mounted at the bottom of the treatment tank, an output shaft of the motor extends into the filter chamber and then is provided with a solid shaft, a filter cartridge is arranged on the solid shaft, the upper end of the solid shaft is connected with a hollow shaft, a stirring paddle is arranged on the hollow shaft, a water outlet hole is formed in the hollow shaft, and the upper end of the hollow shaft extends into the top of the decontamination chamber; a sewer pipe is arranged on a partition plate above an annular space between the filter cartridge and the side wall of the filter chamber, a valve is arranged on the sewer pipe, and the inner end of the water outlet pipe extends into the filter chamber and then is bent downwards into the filter cartridge. In conclusion, the device disclosed by the utility model has the advantages of high treatment efficiency, small occupied area and capability of removing organic matters.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality treatment systems, and particularly relates to a circulating water quality treatment system for a steel mill. Background Art

[0002] The steel industry has a large wastewater discharge volume and also accounts for a large proportion in the total industrial wastewater discharge volume. At the same time, these wastewaters contain a certain amount of pollutants and harmful substances. It is necessary to effectively treat the wastewaters in the steel industry, pay attention to the problem of water body pollution, and fundamentally achieve the effective protection and conservation of water resources. At present, the water circulation in steel mills includes a net circulation and a dirty circulation. Among them, the net circulation is mainly for equipment cooling water, with a small degree of pollution and simple water quality treatment. After filtration and cooling, it can be put into use again. The dirty circulation is mainly used for flushing the waste slag generated during the steelmaking process, with low requirements for water quality. The generated wastewater contains more impurities, a large proportion of suspended solids, and contains oil and organic substances.

[0003] The existing circulating water quality treatment system for steel mills has the following problems during use: First, it does not distinguish between the net circulation and dirty circulation wastewaters, and uniformly collects and centrally treats them. In order to achieve a better treatment effect, it will be carried out in the way of treating the dirty circulation, which will undoubtedly increase the wastewater treatment volume and reduce the wastewater treatment efficiency; Second, during the long-term use of the circulating water, scale will continuously be generated, which will not only block the conveying pipeline but also affect the cooling effect of the circulating water on the corresponding equipment; Third, the countercurrent inclined tube or inclined plate sedimentation technology is used to treat the wastewater, but there are problems such as slow sedimentation speed and large floor area, and the wastewater and sludge also contain residual harmful organic substances, which is not conducive to the continuous use of the circulating water and the discharge of the sludge. Therefore, it is objectively necessary to develop a circulating water quality treatment system for a steel mill with high treatment efficiency, not easy to generate scale, and capable of removing organic substances. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a circulating water quality treatment system for a steel mill with high treatment efficiency, not easy to generate scale, and capable of removing organic substances.

[0005] The purpose of the present utility model is achieved as follows. It includes a water inlet pipe, a treatment tank, and a water outlet pipe. The interior of the treatment tank is sequentially divided into a descaling chamber, a decontamination chamber, an organic matter treatment chamber, and a filtration chamber from top to bottom by a partition board. A number of cathode rods and anode rods are vertically arranged in the descaling chamber. The water inlet pipe is communicated with the descaling chamber. An inlet water branch pipe is arranged on the water inlet pipe, and a filter is arranged on the inlet water branch pipe. A communicating pipe is arranged at the lower part of the side wall of the descaling chamber opposite to the position of the water inlet pipe, and the communicating pipe is tangentially communicated with the upper part of the decontamination chamber. A pressure pump is arranged on the communicating pipe. A sewage guiding cone is arranged in the decontamination chamber. A motor is installed at the bottom of the treatment tank. The output shaft of the motor extends into the filtration chamber and is provided with a solid shaft. A filter cylinder with an open upper end and a closed bottom is arranged on the solid shaft. The upper end of the solid shaft extends into the organic matter treatment chamber and is connected with a hollow shaft. Stirring paddles are arranged on the hollow shaft. Water outlet holes are processed on the hollow shaft. The upper end of the hollow shaft extends into the top of the decontamination chamber. A drain pipe is arranged on the partition board above the annular space between the filter cylinder and the side wall of the filtration chamber, and a valve is arranged on the drain pipe. The inner end of the water outlet pipe extends into the filtration chamber and then bends downward into the filter cylinder.

[0006] Further, a water outlet branch pipe is arranged on the water outlet pipe, and a cooler is arranged on the water outlet branch pipe.

[0007] Further, the water inlet pipe is located at the upper part of the descaling chamber, and multiple baffle plates are arranged in a staggered manner in the descaling chamber below the water inlet pipe.

[0008] Further, a liquid level sensor is arranged on the partition board above the annular space between the filter cylinder and the side wall of the filtration chamber.

[0009] Further, the number of the water outlet holes is multiple, and the multiple water outlet holes are evenly distributed up and down along the hollow shaft.

[0010] Further, a conical filter screen is arranged at the upper end of the hollow shaft.

[0011] Further, a brush is vertically arranged on the partition board at the top of the filtration chamber, and the bristles of the brush are in contact with the outer wall of the filter cylinder.

[0012] The utility model is specially designed according to the characteristics of the circulating water in the steel mill. During installation, the water inlet pipe is connected to the outlet of the clean circulation in the steel mill, and the water inlet branch pipe is connected to the outlet of the dirty circulation in the steel mill. During operation, the circulating water for the clean circulation in the steel mill enters the water inlet pipe, and the circulating water for the dirty circulation in the steel mill enters the water inlet branch pipe. After passing through the filter to filter out the particulate impurities therein, they then enter the descaling chamber uniformly. In the descaling chamber, a cathode rod and an anode rod are arranged. Under the action of a DC electric field, electrolysis occurs near the cathode rod in the circulating water, generating HO ions, breaking the balance of alkalinity and hardness in the circulating water near the cathode rod. The HCO3 ions in the circulating water are converted into CO3, and at the same time, the scaling ions such as Ca and Mg in the circulating water move towards the cathode region under the action of electrostatic attraction, generating CaCO3 and Mg(OH)2 precipitates, which precipitate out and are discharged with the water flow. The circulating water carrying the precipitates enters the dirt removal chamber tangentially after being pressurized by a pressure pump, forming a swirl in the dirt removal chamber. Under the action of centrifugal force, the heavier precipitates are thrown out, and the middle part is the circulating water without dirt such as precipitates. Subsequently, the circulating water enters from the upper end of the hollow shaft, then enters the organic matter treatment chamber through the water outlet holes, mixes with drugs such as flocculants added to the organic matter treatment chamber, generates aggregated large particles, and is discharged into the filtration chamber through the down pipe. The filter cartridge filters the aggregated large particles in the circulating water, and finally, relatively clean circulating water that can be used continuously is obtained and discharged from the water outlet pipe and enters the circulation system for continued use. In the above process, according to the usage characteristics of the circulating water in the steel mill, only the circulating water in the dirty circulation is pre-filtered, and the circulating water in the clean circulation is directly sent to the treatment tank for purification treatment, reducing the working load of the filter and improving the treatment efficiency of the circulating water. Secondly, the utility model adopts the method of electrochemical descaling, which can efficiently remove scaling ions such as Ca and Mg in the circulating water, fundamentally solve the problem of circulating water scaling, prevent blockage of the conveying pipeline and equipment due to scaling, and ensure the cooling effect of the circulating water on the corresponding equipment. In addition, an organic matter treatment chamber is also arranged in the utility model. During use, the motor is started, and the motor drives the solid shaft, the hollow shaft, and the filter cartridge to rotate in sequence. Drugs such as flocculants and the circulating water are mixed to quickly form aggregated large particles, which can efficiently remove the organic matter in the circulating water and is more conducive to the continued use of the circulating water. Compared with the traditional inclined tube or inclined plate precipitation technology, the organic matter removal efficiency is higher, and the utility model integrates descaling, organic matter removal, and filtration work tightly in the same treatment tank, occupying less land area and reducing the conveying cost of the circulating water. In summary, the utility model has the advantages of high treatment efficiency, small floor area, and the ability to remove organic matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the overall structural schematic diagram of the utility model;

[0014] In the figure: 1 - water inlet pipe, 2 - treatment tank, 3 - water outlet pipe, 4 - partition board, 5 - scale removal chamber, 6 - dirt removal chamber, 7 - organic matter treatment chamber, 8 - filtration chamber, 9 - cathode rod, 10 - anode rod, 11 - water inlet branch pipe, 12 - filter, 13 - pressure pump, 14 - dirt guiding cone, 15 - motor, 16 - solid shaft, 17 - filter cartridge, 18 - hollow shaft, 19 - water outlet branch pipe, 20 - cooler, 21 - baffle plate, 22 - liquid level sensor, 23 - conical filter screen, 24 - brush, 25 - stirring paddle. Detailed implementation mode

[0015] The present utility model will be further described below in conjunction with the accompanying drawings, but it is not limited to the present utility model in any way. Any change or improvement based on the present utility model falls within the protection scope of the present utility model.

[0016] As Figure 1 shown, the present utility model includes a water inlet pipe 1, a treatment tank 2 and a water outlet pipe 3. The interior of the treatment tank 2 is sequentially divided into a scale removal chamber 5, a dirt removal chamber 6, an organic matter treatment chamber 7 and a filtration chamber 8 from top to bottom by a partition board 4. A plurality of cathode rods 9 and anode rods 10 are vertically arranged in the scale removal chamber 5. The arrangement structure of the cathode rods 9 and the anode rods 10 is the prior art. The water inlet pipe 1 is communicated with the scale removal chamber 5. A water inlet branch pipe 11 is arranged on the water inlet pipe 1, and a filter 12 is arranged on the water inlet branch pipe 11. A communicating pipe is arranged at the lower part of the side wall of the scale removal chamber 5 opposite to the position of the water inlet pipe 1, and the communicating pipe is tangentially communicated with the upper part of the dirt removal chamber 6. A pressure pump 13 is arranged on the communicating pipe. A dirt guiding cone 14 is arranged in the dirt removal chamber 6. A motor 15 is installed at the bottom of the treatment tank 2. The output shaft of the motor 15 extends into the filtration chamber 8 and is provided with a solid shaft 16. A filter cartridge 17 with an open upper end and a closed bottom is arranged on the solid shaft 16. The upper end of the solid shaft 16 extends into the organic matter treatment chamber 7 and is connected with a hollow shaft 18. The hollow shaft 18 is processed with water outlet holes. The upper end of the hollow shaft 18 extends to the top in the dirt removal chamber 6. A water pipe is arranged on the partition board 4 above the annular space between the filter cartridge 17 and the side wall of the filtration chamber 8, and a valve is arranged on the water pipe. The inner end of the water outlet pipe 3 extends into the filtration chamber 8 and then bends downward into the filter cartridge 17.

[0017] The utility model is specially designed according to the characteristics of the circulating water in the steel mill. During installation, the water inlet pipe 1 is connected to the outlet of the clean circulating water in the steel mill, and the water inlet branch pipe 11 is connected to the outlet of the dirty circulating water in the steel mill. During operation, the circulating water for the clean circulation in the steel mill enters the water inlet pipe 1, and the circulating water for the dirty circulation in the steel mill enters the water inlet branch pipe 11. After passing through the filter 12 to filter out the particulate impurities therein, they then enter the descaling chamber 5 together. A cathode rod 9 and an anode rod 10 are arranged in the descaling chamber 5. Under the action of the DC electric field, electrolysis occurs near the cathode rod 9 in the circulating water, generating HO ions, breaking the balance of alkalinity and hardness in the circulating water near the cathode rod 9. The HCO3 ions in the circulating water are converted into CO3, and at the same time, the scaling ions such as Ca and Mg in the circulating water move towards the cathode region under the action of electrostatic attraction, generating CaCO3 and Mg(OH)2 precipitates, which precipitate out and are discharged with the water flow. The circulating water carrying the precipitate enters the dirt removal chamber 6 tangentially after being pressurized by the pressure pump 13, forming a swirl in the dirt removal chamber 6. Under the action of centrifugal force, the heavier precipitate is thrown out and falls along the dirt guide cone 14 to the bottom of the dirt removal chamber 6, and can be discharged regularly. The middle part is the circulating water without dirt such as precipitate. Subsequently, the circulating water enters from the upper end of the hollow shaft 18, then enters the organic matter treatment chamber 7 from the water outlet holes, mixes with drugs such as flocculants added to the organic matter treatment chamber 7 to generate agglomerated large particles, and is discharged into the filtration chamber 8 through the down pipe. The filter cartridge 17 filters the agglomerated large particles in the circulating water, and finally the relatively clean circulating water that can be reused is obtained and discharged from the water outlet pipe 3 and enters the circulation system for continued use. The filtered agglomerated large particles fall to the bottom of the filtration chamber 8 and can be discharged regularly.

[0018] In the above process, according to the usage characteristics of the circulating water in the steel mill, only the circulating water in the dirty circulation is pre-filtered, and the circulating water in the clean circulation is directly sent to the treatment tank 2 for purification treatment, reducing the working load of the filter 12 and improving the treatment efficiency of the circulating water. Secondly, the utility model adopts the method of electrochemical descaling, which can efficiently remove scaling ions such as Ca and Mg in the circulating water, fundamentally solve the problem of circulating water scaling, prevent the conveying pipelines and equipment from being blocked due to scaling, and ensure the cooling effect of the circulating water on the corresponding equipment. In addition, an organic matter treatment chamber 7 is also arranged in the utility model. During use, the motor 15 is started, and the motor 15 drives the solid shaft 16, the hollow shaft 18 and the filter cartridge 17 to rotate in sequence. Drugs such as flocculants and the circulating water are mixed to quickly form agglomerated large particles. Subsequently, the filter cartridge 17 is used to efficiently remove impurities such as agglomerated large particles, which can efficiently remove the organic matter in the circulating water and is more conducive to the continued use of the circulating water. Compared with the traditional inclined tube or inclined plate sedimentation technology, the organic matter removal efficiency is higher, and the agglomerated large particles and other impurities can be removed more quickly. Moreover, the utility model integrates descaling, organic matter removal and filtration work tightly in the same treatment tank 2, covering a smaller area and reducing the conveying cost of the circulating water.

[0019] A water outlet branch pipe 19 is arranged on the water outlet pipe 3, and a cooler 20 is arranged on the water outlet branch pipe 19. The cooler 20 is an existing cooling device. During the production process of a steel mill, the net cycle circulating water mainly used for equipment cooling needs to be cooled, while the dirty cycle circulating water mainly used for slag washing and equipment washing does not need to be cooled. In view of this situation, only the net cycle circulating water can be cooled by using the cooler 20, and the circulating water used for the dirty cycle can be directly discharged. Compared with the traditional system in which all circulating water is uniformly cooled, targeted classification treatment is carried out, reducing the energy consumption during the cooling process and lowering the treatment cost while meeting the usage requirements.

[0020] The water inlet pipe 1 is located at the upper part of the descaling chamber 5. A plurality of baffle plates 21 are arranged in a staggered manner in the descaling chamber 5 below the water inlet pipe 1. When the system operates, the circulating water enters the descaling chamber 5 from the water inlet pipe 1, and then flows through each cathode rod 9 and anode rod 10 to remove scale-forming ions such as Ca and Mg in the circulating water. However, in the actual operation process, due to reasons such as too fast flow rate of the circulating water, some scale-forming ions such as Ca and Mg in the circulating water flow away before they can be removed, reducing the descaling effect. In order to improve the descaling efficiency, the baffle plates 21 are provided, so that the circulating water can flow back and forth continuously in the descaling chamber 5, improving the removal efficiency of scale-forming ions such as Ca and Mg, and thus improving the descaling effect.

[0021] A liquid level sensor 22 is arranged on the partition plate 4 above the annular space between the filter cartridge 17 and the side wall of the filtration chamber 8. In the filtration chamber 8, the filter cartridge 17 filters the coagulated large particles in the circulating water. If the water level is too high, the coagulated large particles will directly enter through the upper port of the filter cartridge 17, failing to achieve the purpose of filtration. In order to prevent this situation, the liquid level sensor 22 is provided to monitor the water level of the circulating water in the filtration chamber 8 to ensure that the highest water level line is lower than the upper port of the filter cartridge 17.

[0022] The number of water outlet holes is multiple, and the multiple water outlet holes are evenly distributed up and down along the hollow shaft 18. The circulating water in the decontamination chamber 6 enters from the upper port of the hollow shaft 18 and then flows into the organic matter treatment chamber 7 through the water outlet holes. After setting multiple water outlet holes evenly distributed up and down, the circulating water can enter the organic matter treatment chamber 7 more evenly, mix with drugs such as coagulants faster, improve the coagulation efficiency, and shorten the removal time of organic matter.

[0023] A conical filter screen 23 is provided at the upper end of the hollow shaft 18. When the utility model operates, the circulating water tangentially enters the dirt removal chamber 6 and flows spirally therein. Under the action of centrifugal force, the sediment in the circulating water moves outward and then falls along the side wall of the dirt removal chamber 6. However, in actual use, it is inevitable that a very small amount of sediment will flow towards the position of the hollow shaft 18 with the circulating water and then enter it from the upper port of the hollow shaft 18, which may cause blockage of the hollow shaft 18 and also reduce the subsequent removal efficiency of organic matter. To solve this problem, the conical filter screen 23 is provided to filter and block all the sediment.

[0024] A brush 24 is vertically provided on the partition plate 4 at the top of the filtration chamber 8. The bristles of the brush 24 are in contact with the outer wall of the filter cylinder 17. The brush 24 is fixed on the partition plate 4 and is in a static state. The filter cylinder 17 rotates with the solid shaft 16 driven by the motor 15. The filter cylinder 17 in the utility model is used to filter impurities such as agglomerated large particles in the circulating water. The agglomerated large particles and other impurities are intercepted outside the filter cylinder 17, and the circulating water passes through the filter holes of the filter cylinder 17 and enters the inside of the filter cylinder 17. During long-term use, the agglomerated large particles and other impurities will gradually adhere to the surface of the filter cylinder 17, thereby causing blockage and reducing the filtration efficiency of the filter cylinder 17. To solve this problem, the brush 24 is provided. The brush 24 can brush off the agglomerated large particles and other impurities adhering to the surface of the filter cylinder 17 during the rotation of the filter cylinder 17 to prevent blockage of the filter holes of the filter cylinder 17.

[0025] A stirring paddle 25 is provided on the hollow shaft 18 in the organic matter treatment chamber 7. The stirring paddle 25 is provided on the hollow shaft 18. When the motor 15 operates, it drives the stirring paddle 25 to rotate, thereby stirring the drugs and the circulating water in the organic matter treatment chamber 7, promoting the mixing of drugs such as flocculants and the circulating water, quickly forming agglomerated large particles, and improving the removal efficiency of organic matter in the circulating water.

Claims

1. A circulating water quality treatment system for a steel mill, comprising an inlet pipe (1), a treatment tank (2) and an outlet pipe (3), characterized in that : The interior of the treatment tank (2) is sequentially divided from top to bottom by a partition plate (4) into a descaling chamber (5), a decontamination chamber (6), an organic matter treatment chamber (7), and a filtration chamber (8). A plurality of cathode rods (9) and anode rods (10) are vertically arranged in the descaling chamber (5). The water inlet pipe (1) communicates with the descaling chamber (5). An inlet water branch pipe (11) is arranged on the water inlet pipe (1), and a filter (12) is arranged on the inlet water branch pipe (11). A communicating pipe is arranged at the lower part of the side wall of the descaling chamber (5) opposite to the position of the water inlet pipe (1). The communicating pipe is tangentially communicated with the upper part of the decontamination chamber (6), and a pressure pump (13) is arranged on the communicating pipe. A dirt guiding cone (14) is arranged in the decontamination chamber (6). A motor (15) is installed at the bottom of the treatment tank (2). After the output shaft of the motor (15) extends into the filtration chamber (8), a solid shaft (16) is arranged. A filter cylinder (17) with an open upper end and a closed bottom is arranged on the solid shaft (16). After the upper end of the solid shaft (16) extends into the organic matter treatment chamber (7), it is connected with a hollow shaft (18). Water outlet holes are processed on the hollow shaft (18). The upper end of the hollow shaft (18) extends into the top of the decontamination chamber (6). A water outlet pipe is arranged on the partition plate (4) above the annular space between the filter cylinder (17) and the side wall of the filtration chamber (8), and a valve is arranged on the water outlet pipe. The inner end of the water outlet pipe (3) extends into the filtration chamber (8) and then bends downward into the filter cylinder (17).

2. The circulating water quality treatment system for a steel mill according to claim 1, wherein : An outlet water branch pipe (19) is arranged on the water outlet pipe (3), and a cooler (20) is arranged on the outlet water branch pipe (19).

3. A circulating water quality treatment system for a steel mill according to claim 1, characterized in that : The water inlet pipe (1) is located at the upper part of the descaling chamber (5), and a plurality of baffle plates (21) are arranged in a staggered manner in the descaling chamber (5) below the water inlet pipe (1).

4. A circulating water quality treatment system for a steel mill according to claim 1, characterized in that : A liquid level sensor (22) is arranged on the partition plate (4) above the annular space between the filter cylinder (17) and the side wall of the filtration chamber (8).

5. A circulating water quality treatment system for a steel mill according to claim 1, characterized in that : The number of the water outlet holes is multiple, and the multiple water outlet holes are evenly distributed up and down along the hollow shaft (18).

6. The circulating water quality treatment system for a steel mill according to claim 1, wherein : A conical filter screen (23) is arranged at the upper end of the hollow shaft (18).

7. A circulating water quality treatment system for a steel mill according to claim 1, characterized in that : A brush (24) is vertically arranged on the partition plate (4) at the top of the filtration chamber (8), and the bristles of the brush (24) are in contact with the outer wall of the filter cylinder (17).

8. A circulating water quality treatment system for a steel mill according to claim 1, characterized in that : A stirring paddle (25) is arranged on the hollow shaft (18) in the organic matter treatment chamber (7).

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