Efficient wastewater purification and waste heat recovery integrated equipment for steel mill coking

Abstract

The utility model relates to the technical field of coking wastewater treatment of steel mills, in particular to efficient wastewater purification and waste heat recovery integrated equipment for coking of steel mills, which comprises a rough filtration tank, an aeration tank is fixedly mounted on the outer surface of the rough filtration tank, and a heat preservation water tank is buried on the ground of one side of the rough filtration tank. And heat dissipation fins are fixedly mounted in the filtering sedimentation tank. According to the efficient wastewater purification and waste heat recovery integrated equipment for coking in the steel mill, wastewater is filtered by a filtering fence after being discharged into a coarse filtering box and then enters a filtering and settling pond to be filtered step by step, and when the wastewater flows through the filtering and settling pond, heat of the wastewater is absorbed by heat dissipation fins, so that the heat dissipation efficiency of the wastewater is improved. At the moment, the first circulating water pump is started to pump out the water in the heat preservation water tank and take away heat, so that the temperature can be reduced while impurities in the waste water are settled, the temperature can be stored in the heat preservation water tank, and the heat of the waste water can be recycled for other purposes.

Description

Technical Field

[0001] This utility model relates to the field of steel plant coking wastewater treatment technology, specifically to an integrated equipment for high-efficiency wastewater purification and waste heat recovery in steel plant coking. Background Technology

[0002] In the coking process of the steel industry, a large amount of wastewater is generated. This wastewater has a large discharge volume and carries significant heat energy. However, the recovery and utilization of wastewater heat has long been lacking in the traditional treatment mode, resulting in serious energy waste. The temperature of wastewater generated by the coking process is usually between 70-90℃. If it is directly discharged or sent to a cooling pond for cooling treatment, the heat carried by this wastewater is equivalent to the energy wasted of about 10-15 tons of standard coal. In addition, energy is also consumed when cooling the wastewater. In the traditional wastewater treatment process, each link is relatively independent. High-temperature wastewater is directly cooled without effective heat recovery. The subsequent biological treatment link requires a large amount of energy to raise the water temperature to the temperature suitable for microbial survival, forming an ineffective energy consumption cycle of "cooling-heating". This increases the energy consumption cost of wastewater treatment, wastes heat, aggravates the problem of environmental thermal pollution, and also has a negative impact on the surrounding aquatic ecosystem. Utility Model Content

[0003] The purpose of this invention is to provide an integrated equipment for efficient wastewater purification and waste heat recovery in steel plant coking processes, in order to solve the problem mentioned in the background art that the heat of wastewater during production cannot be recovered.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an integrated equipment for high-efficiency wastewater purification and waste heat recovery in steel plant coking, comprising a coarse filter box, an aeration tank fixedly installed on the outer surface of the coarse filter box and buried underground, an insulated water tank buried on one side of the ground, a filtration sedimentation tank fixedly connected to the outer surface of the coarse filter box and interconnected by pipes, a heat dissipation fin fixedly installed inside the filtration sedimentation tank and the outer surface of the heat dissipation fin does not contact the pipes of the filtration sedimentation tank, the outer surface of the filtration sedimentation tank is penetrated by the pipes of the heat dissipation fin, a first circulating water pump fixedly installed on one side of the insulated water tank and connected to the pipes of the heat dissipation fin, and another pipe of the heat dissipation fin connected to the insulated water tank.

[0005] Preferably, a first electric actuator is fixedly installed on the outer surface of the coarse filter box, and the output end of the first electric actuator penetrates through the outer surface of the coarse filter box. A filter grid is fixedly installed inside the coarse filter box, and the filter grid is designed to be inclined. A cleaning brush is fixedly installed on the output end of the first electric actuator, and the outer surface of the cleaning brush is in contact with the outer surface of the filter grid.

[0006] Using the above technical solution, wastewater discharged into the coarse filter box can be initially filtered through the filter screen. The inclined design of the filter screen allows the filtered dirt to be collected by flushing, filtering large pieces of dirt without clogging the filter screen. At the same time, the first electric push rod can move the cleaning brush to clean the filter screen again, further reducing the chance of dirt clogging the filter screen, reducing the difficulty of subsequent wastewater treatment, and preventing the filter screen from clogging.

[0007] Preferably, a spiral conveying assembly is installed through one side of the outer surface of the coarse filter box, and the spiral conveying assembly is located on one side of the filter grid.

[0008] Using the above technical solution, after the dirt is washed away and accumulated, the screw conveyor assembly can be activated to discharge these large pieces of dirt through its rotation, eliminating the need for manual cleaning and greatly improving the convenience of cleaning.

[0009] Preferably, a second electric actuator is fixedly installed on the outer surface of one end of the sedimentation tank, and the output end of the second electric actuator penetrates through the outer surface of the sedimentation tank. A sealing ring is provided between the sedimentation tank and the second electric actuator. A scraper is fixedly installed on the output end of the second electric actuator, and the outer surface of the scraper is in contact with the outer surface of the sedimentation tank. A solenoid valve is installed through the outer surface of the sedimentation tank. A recess is provided at one end of the sedimentation tank, and the recess of the sedimentation tank is located on one side of the solenoid valve.

[0010] Using the above technical solution, after a long period of use, a large amount of impurities will accumulate inside the filter sedimentation tank. At this time, it is only necessary to start the second electric actuator. The retraction of the second electric actuator will drive the scraper to move, allowing the scraper to scrape and wash the dirt at the bottom of the filter sedimentation tank and collect it in the depression. Then, the solenoid valve can be opened to discharge these impurities, which improves the convenience of cleaning the filter sedimentation tank.

[0011] Preferably, the filtration sedimentation tank has a pipe on the side near the insulated water tank, the pipe of the filtration sedimentation tank is located above the aeration tank, an aeration disc assembly is fixedly installed inside the filtration sedimentation tank, and one end of the aeration disc assembly penetrates the outer surface of the filtration sedimentation tank, the aeration disc assembly is connected to the air inlet device.

[0012] By adopting the above technical solution, gas can be transported into the aeration disc assembly through pipelines, allowing the gas to enter the water stored in the aeration tank evenly. The water discharged through the pipeline of the filtration sedimentation tank further increases the gas content in the wastewater, allowing the wastewater to come into contact with air during the discharge process, thereby improving the wastewater treatment efficiency in the aeration tank.

[0013] Preferably, heating fins are fixedly installed inside the filtration sedimentation tank and are located around the filtration sedimentation tank. The pipes at one end of the heating fins are connected to the insulated water tank. A second circulating water pump is fixedly installed on the ground at one end of the aeration tank and is connected to the insulated water tank and the heating fins respectively. A temperature sensor is fixedly installed inside the aeration tank.

[0014] Using the above technical solution, the second circulating water pump can send the heated water from the insulated water tank out and discharge it into the heating fins. The heating fins heat or keep the wastewater in the aeration tank warm, and the water temperature in the aeration tank is monitored by a temperature sensor. When the water temperature reaches the set value, the second circulating water pump automatically stops to prevent the temperature from being too high or too low and affecting the wastewater treatment in the aeration tank. This allows the heat of the wastewater to be better utilized and improves the wastewater treatment efficiency in the aeration tank. At the same time, by maintaining the temperature, the viscosity of the wastewater is reduced, thus reducing energy consumption during wastewater treatment.

[0015] Preferably, a water pump is fixedly installed on the ground at the end of the filtration sedimentation tank away from the insulated water tank, and the water pump is connected to the filtration sedimentation tank. A filtration device is fixedly installed on the ground on one side of the filtration sedimentation tank.

[0016] By adopting the above technical solution, the treated water in the aeration tank is pumped out and filtered through a filtration device to remove some impurities in the water. The filtered water can then be discharged or used in other processes, reducing environmental pollution and water waste.

[0017] Compared with the prior art, the beneficial effects of this utility model are: This integrated equipment for high-efficiency wastewater purification and waste heat recovery in steel plant coking processes is:

[0018] 1. After the wastewater is discharged into the coarse filter box, it will pass through the filter screen and enter the sedimentation tank for step-by-step filtration. When the wastewater flows through the sedimentation tank, the heat of the wastewater will be absorbed by the heat dissipation fins. At this time, the start of the first circulating water pump will pump the water in the insulated water tank and take away the heat. This will allow the impurities in the wastewater to settle and cool down the wastewater. The heat can be stored in the insulated water tank so that the heat of the wastewater can be recovered and used for other purposes.

[0019] 2. Large impurities in wastewater can be filtered through the filter screen. The inclined design of the filter screen and the flushing of wastewater cause the filtered impurities to gather together. The first electric actuator drives the cleaning brush to move, allowing the cleaning brush to wash the filter screen again, preventing the filter screen from clogging after long-term use. At the same time, the spiral conveying assembly can also clean the gathered impurities, ensuring the flow rate of the filter screen while reducing the difficulty of cleaning impurities.

[0020] 3. After prolonged use, a large amount of impurities will remain inside the filter sedimentation tank. At this time, simply activate the second electric actuator to move the scraper. The scraper cleans and washes the bottom of the filter sedimentation tank, allowing the impurities to accumulate in the grooves of the filter sedimentation tank. Then, open the solenoid valve to release the water flow and remove the impurities. This prevents the impurities from floating due to the flow of wastewater after filtration and sedimentation, making it convenient to clean the filter sedimentation tank while ensuring the quality of the filtered wastewater.

[0021] 4. When the settled wastewater is discharged from the filtration sedimentation tank, it will come into contact with air to increase its oxygen content. At the same time, the water temperature in the aeration tank is monitored by a temperature sensor. When the water temperature in the aeration tank is too low, the second circulating water pump will start, pumping hot water out of the aeration tank and delivering it to the heating fins. This allows the heating fins to agitate the water in the aeration tank along with the gas sprayed from the aeration disc assembly, ensuring that the water temperature in the aeration tank is heated evenly. This reduces the viscosity of the water, allowing the aeration tank to react and treat the wastewater more quickly, recovering the heat from the wastewater and improving the wastewater treatment efficiency. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the coarse filter box and aeration tank of this utility model;

[0023] Figure 2 This is a cross-sectional three-dimensional structural diagram of the aeration tank and heating fins of this utility model;

[0024] Figure 3 This is a three-dimensional structural diagram of the spiral conveying assembly and solenoid valve of this utility model;

[0025] Figure 4 This is an exploded three-dimensional structural diagram of the filter sedimentation tank and heat dissipation fins of this utility model;

[0026] Figure 5 This is a cross-sectional perspective view of the coarse filter box and cleaning brush of this utility model.

[0027] Figure 6 This is a cross-sectional three-dimensional structural diagram of the coarse filter box and the filtration sedimentation tank of this utility model.

[0028] In the diagram: 1. Coarse filter box; 2. Filter screen; 3. First electric actuator; 4. Cleaning brush; 5. Screw conveyor assembly; 6. Filter sedimentation tank; 7. Heat dissipation fins; 8. Aeration tank; 9. Insulated water tank; 10. First circulating water pump; 11. Second electric actuator; 12. Scraper; 13. Solenoid valve; 14. Heating fins; 15. Aeration disc assembly; 16. Temperature sensor; 17. Water pump; 18. Filtration device; 19. Second circulating water pump. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-6 This utility model provides a technical solution: an integrated equipment for high-efficiency wastewater purification and waste heat recovery in steel plant coking, including a coarse filter box 1. A first electric push rod 3 is fixedly installed on the outer surface of the coarse filter box 1, and the output end of the first electric push rod 3 penetrates through the outer surface of the coarse filter box 1. A filter grid 2 is fixedly installed inside the coarse filter box 1, and the filter grid 2 is designed to be inclined. A cleaning brush 4 is fixedly installed on the output end of the first electric push rod 3, and the outer surface of the cleaning brush 4 is in contact with the outer surface of the filter grid 2. A spiral conveying assembly 5 is installed through one side of the outer surface of the coarse filter box 1, and the spiral conveying assembly 5 is located on one side of the filter grid 2.

[0031] Firstly, when treating wastewater, the wastewater is discharged into the coarse filter box 1. The wastewater is coarsely filtered through the filter screen 2. The inclined design of the filter screen 2 allows the wastewater to flush away the filtered impurities, causing them to accumulate. When the filter screen 2 becomes clogged, the first electric push rod 3 drives the cleaning brush 4 to move, brushing the surface of the filter screen 2 and allowing impurities to accumulate. These accumulated impurities are then discharged through the rotation of the screw conveyor assembly 5. This process removes impurities from the wastewater, reducing the difficulty of subsequent wastewater treatment and enhancing the practicality of the integrated equipment.

[0032] An insulated water tank 9 is buried in the ground on one side of the coarse filter box 1. A filter sedimentation tank 6 is fixedly connected to the outer surface of the coarse filter box 1, and the filter sedimentation tanks 6 are interconnected by pipes. Heat dissipation fins 7 are fixedly installed inside the filter sedimentation tank 6, and the outer surface of the heat dissipation fins 7 does not contact the pipes of the filter sedimentation tank 6. The outer surface of the filter sedimentation tank 6 is penetrated by the pipes of the heat dissipation fins 7. A first circulating water pump 10 is fixedly installed in the ground on one side of the insulated water tank 9, and the first circulating water pump 10 is connected to the pipes of the heat dissipation fins 7. The other pipe of the heat dissipation fins 7 is connected to the insulated water tank 9.

[0033] Secondly, after the wastewater passes through the filter screen 2, it will be discharged into the filter sedimentation tank 6. At this time, the wastewater will settle again in the filter sedimentation tank 6 and flow forward. When the wastewater flows through the heat dissipation fins 7, the heat dissipation fins 7 will absorb the heat of the wastewater. At the same time, the start of the first circulating water pump 10 will draw water out of the insulated water tank 9 and take away the heat of the heat dissipation fins 7, so that the heat of the wastewater is recovered and the temperature of the wastewater is reduced. The hot water can be heated and used for other purposes, which improves the energy recovery of the integrated equipment.

[0034] A second electric actuator 11 is fixedly installed on the outer surface of one end of the sedimentation tank 6, and the output end of the second electric actuator 11 penetrates the outer surface of the sedimentation tank 6. A sealing ring is provided between the sedimentation tank 6 and the second electric actuator 11. A scraper 12 is fixedly installed on the output end of the second electric actuator 11, and the outer surface of the scraper 12 is in contact with the outer surface of the sedimentation tank 6. A solenoid valve 13 is installed through the outer surface of the sedimentation tank 6. A recess is provided at one end of the sedimentation tank 6, and the recess of the sedimentation tank 6 is located on one side of the solenoid valve 13.

[0035] After a period of use, a large amount of impurities will settle inside the filter sedimentation tank 6. At this time, simply start the second electric actuator 11 to drive the scraper 12 to move, so that the scraper 12 can clean and scrub the bottom of the filter sedimentation tank 6, allowing the settled impurities to be collected in the groove of the filter sedimentation tank 6. Then, the solenoid valve 13 can be opened to discharge the impurities along with the wastewater, improving the convenience of cleaning the integrated equipment.

[0036] A pipe is provided on the side of the filtration sedimentation tank 6 near the insulated water tank 9. The pipe of the filtration sedimentation tank 6 is located above the aeration tank 8. An aeration disc assembly 15 is fixedly installed inside the filtration sedimentation tank 6, and one end of the aeration disc assembly 15 penetrates the outer surface of the filtration sedimentation tank 6. The aeration disc assembly 15 is connected to the air inlet device. Heating fins 14 are fixedly installed inside the filtration sedimentation tank 6 and are located around the filtration sedimentation tank 6. The pipe at one end of the heating fin 14 is connected to the insulated water tank 9. A second circulating water pump 19 is fixedly installed on the ground at one end of the aeration tank 8 and is connected to the insulated water tank 9 and the heating fins 14 respectively. A temperature sensor 16 is fixedly installed inside the aeration tank 8.

[0037] After the wastewater passes through the sedimentation tank 6, it will be discharged outwards and come into contact with air to increase its oxygen content. Simultaneously, the wastewater is discharged into the aeration tank 8, and the water temperature in the aeration tank 8 is monitored by the temperature sensor 16. When the temperature sensor 16 detects that the water temperature is too low, the second circulating water pump 19 will start and draw out the hot water from the insulated water tank 9, allowing the hot water to enter the heating fins 14 and release heat. This, combined with the use of the aeration disc assembly 15, allows the water in the aeration tank 8 to be heated evenly and its viscosity to be reduced. This allows the bubbles sprayed by the aeration disc assembly 15 to come into more even contact with the water, increasing the water temperature in the aeration tank 8 while reducing energy consumption. This reduces the energy consumption of the integrated equipment while improving the reaction efficiency of the wastewater.

[0038] An aeration tank 8 is fixedly installed on the outer surface of the coarse filter box 1 and is buried underground. A water pump 17 is fixedly installed on the ground at the end of the filter sedimentation tank 6 away from the insulated water tank 9 and is connected to the filter sedimentation tank 6. A filter device 18 is fixedly installed on the ground on one side of the filter sedimentation tank 6.

[0039] Finally, once the water in the aeration tank 8 has reacted well, the water can be pumped out by the water pump 17 and filtered by the filter device 18 so that the water can meet the discharge standards and be discharged, or the water can be sent to other processes for use.

[0040] Working principle: Wastewater is discharged into the coarse filter tank 1 and filtered through the filter screen 2 to remove large impurities. The filtered wastewater then flows into the sedimentation tank 6 for further settling and filtration. While the wastewater passes through the sedimentation tank 6, the heat dissipation fins 7 absorb heat from the wastewater. The first circulating water pump 10 then draws water from the insulated water tank 9 to remove the heat from the wastewater, eliminating the need for separate cooling. The settled wastewater is then discharged into the aeration tank 8, where the temperature is monitored by the temperature sensor 16. When the temperature sensor 16 detects... When the water temperature is detected to be too low, the second circulating water pump 19 will start and pump out the hot water from the insulated water tank 9, so that the hot water is discharged into the heating fins 14 for heat dissipation. In conjunction with the use of the aeration disc assembly 15, the water in the aeration tank 8 can be heated evenly with the agitation of the air bubbles, so that the temperature in the aeration tank 8 can be maintained within the specified range, ensuring the reaction efficiency of the water in the aeration tank 8. After the water in the aeration tank 8 has reacted for a period of time, it can be pumped out by the water pump 17 and filtered by the filter device 18, so that the filtered water can be discharged or reused in other processes.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A kind of high-efficiency wastewater purification and waste heat recovery integrated equipment for steel plant coking, including rough filter box (1), the outer surface of rough filter box (1) is fixedly installed with aeration tank (8), and aeration tank (8) is buried in ground bottom, and the ground of one side of rough filter box (1) is buried with heat preservation water tank (9), the outer surface of rough filter box (1) is fixedly connected with filter sedimentation tank (6), and filter sedimentation tank (6) is interconnected by pipeline, it is characterized by: The filter sedimentation tank (6) is fixedly installed with heat dissipation fins (7), and the outer surface of the heat dissipation fins (7) does not contact the pipes of the filter sedimentation tank (6). The outer surface of the filter sedimentation tank (6) is penetrated by the pipes of the heat dissipation fins (7). A first circulating water pump (10) is fixedly installed on one side of the ground of the insulated water tank (9), and the first circulating water pump (10) is connected to the pipes of the heat dissipation fins (7). The other pipe of the heat dissipation fins (7) is connected to the insulated water tank (9).

2. The integrated device for efficient wastewater purification and waste heat recovery for coking in a steel plant according to claim 1, characterized in that: The outer surface of the coarse filter box (1) is fixedly installed with a first electric push rod (3), and the output end of the first electric push rod (3) penetrates the outer surface of the coarse filter box (1). The interior of the coarse filter box (1) is fixedly installed with a filter grid (2), and the filter grid (2) is designed to be inclined. The output end of the first electric push rod (3) is fixedly installed with a cleaning brush (4), and the outer surface of the cleaning brush (4) is in contact with the outer surface of the filter grid (2).

3. The integrated device for efficient wastewater purification and waste heat recovery for coking in a steel plant according to claim 1, characterized in that: A spiral conveying assembly (5) is installed through one side of the outer surface of the coarse filter box (1), and the spiral conveying assembly (5) is located on one side of the filter grid (2).

4. The integrated equipment for high-efficiency wastewater purification and waste heat recovery in steel plant coking as described in claim 1, characterized in that: A second electric actuator (11) is fixedly installed on the outer surface of one end of the sedimentation tank (6), and the output end of the second electric actuator (11) penetrates the outer surface of the sedimentation tank (6). A sealing ring is provided between the sedimentation tank (6) and the second electric actuator (11). A scraper (12) is fixedly installed on the output end of the second electric actuator (11), and the outer surface of the scraper (12) is in contact with the outer surface of the sedimentation tank (6). A solenoid valve (13) is installed through the outer surface of the sedimentation tank (6). A recess is provided at one end of the sedimentation tank (6), and the recess of the sedimentation tank (6) is located on one side of the solenoid valve (13).

5. The integrated equipment for high-efficiency wastewater purification and waste heat recovery in steel plant coking as described in claim 1, characterized in that: The filtration sedimentation tank (6) has a pipe on the side near the insulated water tank (9). The pipe of the filtration sedimentation tank (6) is located above the aeration tank (8). An aeration disc assembly (15) is fixedly installed inside the filtration sedimentation tank (6), and one end of the aeration disc assembly (15) penetrates the outer surface of the filtration sedimentation tank (6). The aeration disc assembly (15) is connected to the air inlet device.

6. The integrated equipment for high-efficiency wastewater purification and waste heat recovery in steel plant coking as described in claim 1, characterized in that: Heating fins (14) are fixedly installed inside the filtration sedimentation tank (6), and the heating fins (14) are located around the filtration sedimentation tank (6). The pipe at one end of the heating fins (14) is connected to the heat-insulating water tank (9). A second circulating water pump (19) is fixedly installed on the ground at one end of the aeration tank (8), and the second circulating water pump (19) is connected to the heat-insulating water tank (9) and the heating fins (14) respectively. A temperature sensor (16) is fixedly installed inside the aeration tank (8).

7. The integrated equipment for high-efficiency wastewater purification and waste heat recovery in steel plant coking as described in claim 1, characterized in that: A water pump (17) is fixedly installed on the ground at one end of the filtration sedimentation tank (6) away from the insulated water tank (9), and the water pump (17) is connected to the filtration sedimentation tank (6). A filter device (18) is fixedly installed on the ground on one side of the filtration sedimentation tank (6).

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