A separator with oil concentration monitoring and feedback control

Abstract

This utility model discloses a separator with oil concentration monitoring and feedback control, including an inlet pipe connected to a wastewater tank, a centrifugal pump and a scraper filter connected to the inlet pipe, and a heater connected to the outlet of the scraper filter. The heater outlet is connected to a three-way pipe, with two solenoid valves installed on the other two ends of the three-way pipe. The pipe containing the first solenoid valve is connected to the separator; the pipe containing the second solenoid valve is connected to the wastewater return port pipe of the wastewater tank. The separator has a return water branch pipe, on which several solenoid valves are installed. All solenoid valves are connected to an electrical control box. The return water branch pipe is connected to the wastewater return port pipe and is respectively connected to a clean water outlet and a detection water outlet. An oil concentration detection device is installed on the connecting pipe between the return water branch pipe and the detection water outlet. This separator can quickly, accurately, and in large quantities separate oil and water, improving resource recovery and utilization rates and the automation level of wastewater treatment, and reducing wastewater treatment costs for enterprises.

Description

Technical Field

[0001] This utility model relates to the field of industrial wastewater purification and treatment, and in particular to a separator system with oil concentration monitoring and feedback control. Background Technology

[0002] With increasingly stringent national environmental standards and the growing acceptance of green manufacturing concepts, metallurgical enterprises are facing increasingly stringent requirements for the treatment of oily wastewater. Metallurgical production processes are complex and diverse. During rolling, the heat generated by the friction between metal and rolls needs to be cooled with water, carrying a large amount of rolling oil. During quenching, high-temperature metal is rapidly cooled in water, and oil contamination also enters the water. Furthermore, drainage from lubrication systems directly contains various types of grease. If this oily wastewater is discharged directly without effective treatment, the grease pollutants will severely pollute water bodies, causing aquatic organisms to die from lack of oxygen, disrupting the ecological balance, and causing soil compaction, thus affecting crop growth. Moreover, these greases are valuable resources; direct discharge would result in significant waste and increase production costs for enterprises.

[0003] According to the "Emission Standard of Water Pollutants for Iron and Steel Industry" (GB 13456-2012), there are clear limits on the content of petroleum substances in wastewater discharged from steel plants. For newly established enterprises, starting from January 1, 2015, the content of petroleum substances in directly discharged wastewater must not exceed 1.0 mg / L; the content of petroleum substances in indirectly discharged wastewater must not exceed 5.0 mg / L. For existing enterprises, starting from October 1, 2012, the content of petroleum substances in directly discharged wastewater must not exceed 1.5 mg / L; the content of petroleum substances in indirectly discharged wastewater must not exceed 8.0 mg / L. Therefore, pretreatment of oily wastewater before discharge is particularly important.

[0004] To meet national emission standards, steel mills typically employ conventional methods for treating oily wastewater. Common methods include physical, chemical, and biological methods. However, these conventional methods have several limitations in practical applications. Firstly, their treatment efficiency is insufficient to meet the wastewater treatment needs of large-scale, continuous steel mill production. Steel mills typically have large production scales and correspondingly large wastewater discharge volumes; conventional treatment methods often require long processing times and large equipment, making efficient treatment difficult. Secondly, the treatment effect is unstable and easily affected by factors such as wastewater composition, temperature, and pH. For example, when wastewater contains a large amount of surfactants or other impurities, it affects the oil-water separation effect; temperature changes also affect the activity of microorganisms and the rate of chemical reactions, thus impacting the treatment effect. Furthermore, conventional treatment methods have low automation levels, requiring significant manual operation and monitoring, which not only increases labor costs but also increases the risk of human error, affecting the stability of the treatment effect.

[0005] In existing technologies, centrifugal separators are commonly used for oil-water separation in industrial wastewater. However, a key problem exists: the separated water samples lack real-time monitoring capabilities and cannot directly meet discharge standards, thus requiring additional storage space for the separated water. During centrifugation, the relative motion between the drum and the liquid creates a negative pressure zone, causing air to be drawn into the liquid, generating bubbles. Simultaneously, the separated water sample flows out at extremely high speeds when pumped out by a centrifugal pump. When the high-speed fluid passes through a small orifice, the velocity increases dramatically, and according to fluid mechanics principles, the static pressure decreases, causing dissolved gases (such as air) in the liquid to precipitate and form bubbles. Furthermore, the narrowing of the flow channel induces turbulence, enhancing gas-liquid mixing and further promoting bubble formation and dispersion. The water sample entering the detection pipeline not only flows rapidly but also contains a large number of bubbles. Current oil concentration detection devices primarily use infrared measurement technology, and bubbles and flow velocity can significantly interfere with the detection results. Therefore, additional storage space for separated water is needed to allow the water sample to stabilize before sampling and testing. If the test results are unsatisfactory, the separation process must be repeated. This not only leads to delays in obtaining the separation results but also raises the possibility of repeated processing, which is both time-consuming and labor-intensive. Therefore, the development of new, efficient oil-water separation technology and equipment is urgently needed. High-efficiency oil-water separation equipment can quickly and accurately separate oil and water, improving resource recovery rates, reducing wastewater treatment costs for enterprises, and simultaneously reducing environmental pollution. This promotes the green and sustainable development of the metallurgical industry and is key for metallurgical enterprises to achieve environmental compliance and enhance their competitiveness. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a high-efficiency oil-water separation device that can quickly and accurately separate oil and water.

[0007] The technical solution of this utility model is,

[0008] A separator with oil concentration monitoring and feedback control includes an inlet pipe connected to a wastewater tank, the inlet pipe being connected to a centrifugal pump and a scraper filter, the outlet of the scraper filter being connected to a heater; the outlet of the heater being connected to a three-way pipe, the other two ends of which are equipped with a first solenoid valve and a second solenoid valve.

[0009] The pipeline containing the first solenoid valve is connected to the separator; the pipeline containing the second solenoid valve is connected to the wastewater return port pipeline of the wastewater tank.

[0010] The separator is equipped with a return water branch, which is equipped with several solenoid valves. All solenoid valves are connected to the electrical control box. The return water branch is connected to the wastewater return port pipeline. The return water branch is connected to the clean water outlet and the test water outlet respectively. An oil concentration detection device is installed on the connecting pipeline between the return water branch and the test water outlet.

[0011] According to the present invention, a separator with oil concentration monitoring and feedback control is provided, wherein a check valve and a Y-type filter are sequentially provided on the water inlet pipeline between the wastewater tank and the centrifugal pump.

[0012] According to the present invention, a separator with oil concentration monitoring and feedback control is provided, wherein the separator is connected to a separated oil outlet.

[0013] According to the present invention, a separator with oil concentration monitoring and feedback control is provided, wherein a fourth solenoid valve is provided on the connecting pipe between the return water branch and the wastewater return port pipe.

[0014] According to the present invention, a separator with oil concentration monitoring and feedback control is provided, wherein a third solenoid valve is provided on the connecting pipe between the return water branch and the clean water outlet; and a fifth solenoid valve is provided on the connecting pipe between the return water branch and the detection water outlet.

[0015] According to the present invention, a separator with oil concentration monitoring and feedback control is provided, wherein a deceleration and defoaming device is provided on the connecting pipe between the return water branch and the detection water outlet.

[0016] Furthermore, the deceleration and defoaming device includes a damping orifice, a No. 1 shut-off valve, a filter, a vent valve, and a No. 2 shut-off valve, with the damping orifice located at the inlet of the No. 1 shut-off valve.

[0017] Furthermore, the oil concentration detection device is connected to the electrical control box.

[0018] Furthermore, the vent valve is located on the filter.

[0019] Beneficial effects:

[0020] This utility model relates to a separator with oil concentration monitoring and feedback control, which can quickly, accurately, and in large quantities separate oil and water to meet the daily wastewater treatment needs of steel plants; it improves resource recycling rate and the degree of automation in wastewater treatment, and reduces wastewater treatment costs for enterprises; it has its own detection device, which improves the stability of oil treatment, reduces environmental pollution, and thus promotes the metallurgical industry towards green and sustainable development. It is the key to metallurgical enterprises to achieve environmental compliance and enhance competitiveness. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the separator with oil concentration monitoring and feedback control according to this utility model.

[0022] In the diagram, 1. Shut-off valve, 2. Check valve, 3. Y-type filter, 4. Centrifugal pump, 5. Scraper filter, 6. Heater, 7-1. First solenoid valve, 7-2. Second solenoid valve, 7-3. Third solenoid valve, 7-4. Fourth solenoid valve, 7-5. Fifth solenoid valve, 8. Separator, 9-1. Shut-off valve No. 1, 9-2. Filter, 9-3. Exhaust valve, 9-4. Shut-off valve No. 2, 9-5. Oil concentration detection device, 10. Electrical control box. Detailed Implementation

[0023] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, a check valve 2, a Y-type filter 3, a centrifugal pump 4, a scraper filter 5, and a heater 6 are installed sequentially in the inlet pipeline to achieve preliminary treatment and heating of the wastewater. The treated wastewater passes through a three-way valve. Based on the PLC's detection and judgment of the water sample status and the status of the separator 8, the opening or closing of the first and second solenoid valves 7-1 & 7-2 on the three-way pipeline can be controlled to control its flow into the separator or back to the water tank. After being processed by the separator, the water sample enters the oil concentration detection system 9-5 through the opening of the fifth solenoid valve 7-5 on the return water branch. After detection and analysis, the results are fed back to the control box 10PLC, which performs logical judgment. When the oil concentration value of the separated water sample is lower than the set oil concentration value, the control box 10PLC issues a command to open the solenoid valve 7-3 at the clean water outlet and close the solenoid valve 7-4 on the return water pipeline, allowing the water sample to be discharged directly. If the detected oil concentration value of the water sample exceeds the set standard, neither of the two solenoid valves on the outlet tee will activate, causing the water sample to return to the wastewater tank. Simultaneously, the waste oil separated by the separator is discharged from the oil outlet for convenient on-site collection and recycling.

[0025] For detecting the oil concentration in separated water samples, the relative motion between the centrifuge drum and the liquid during high-speed rotation can create a negative pressure zone, causing air to be drawn into the liquid and form bubbles. Simultaneously, the separated water sample is discharged through a centrifugal pump, resulting in a high flow velocity. When the high-speed fluid passes through a small orifice, the flow velocity increases sharply, and the decrease in static pressure causes dissolved gases (such as air) in the liquid to precipitate and form bubbles. Furthermore, the turbulence created by the narrowing of the flow channel enhances gas-liquid mixing, promoting bubble formation and dispersion. Therefore, the water sample entering the detection pipeline flows very quickly, generating a considerable number of bubbles. Since the oil concentration detection device primarily uses infrared measurement technology, bubbles and flow velocity can significantly interfere with its detection. Therefore, a deceleration and defoaming device is required. This deceleration and defoaming device mainly consists of a damping orifice, a stop valve 1 (9-1), a filter 9-2, a vent valve 9-3, and a stop valve 2 (9-4). A damping orifice is installed at the inlet of the sampling pipeline, specifically at the inlet of stop valve 9-1 (No. 1), to control fluid pressure and flow rate, ensuring the fluid enters the defoaming zone at a stable speed and pressure. Simultaneously, it buffers the impact by generating a pressure drop, assisting in optimizing the operation of the defoaming system and reducing foaming problems caused by fluid instability. The configuration of two stop valves allows for precise flow rate regulation through mechanisms such as throttling, pressure buffering, and flow stability control. When two stop valves are connected in series, staged throttling reduces the impact of the fluid on individual valves, controlling the internal pressure of the filter so that the air pressure precisely opens the vent valve while maintaining a stable filter level. For example, the first valve initially reduces the flow rate, and the second valve further fine-tunes it to the target value. By adjusting the opening of the two valves to distribute the pressure drop, cavitation or vibration caused by excessively high local flow rates is avoided. The filter increases the fluid volume and reduces the flow rate, causing bubbles in the water to separate and rise to the gas accumulation zone. The gas is then discharged through a vent valve installed in the gas accumulation zone, thereby reducing the bubble content in the water. During the filtration process, the liquid level within the filter space remains stable, preventing gas stagnation and ensuring stable operation of the bubble filtration. Through this series of devices, the oil concentration detection device can accurately measure the oil concentration value of the separated water sample when it passes through a smooth, bubble-free state.

[0026] Therefore, this utility model can effectively solve the problem of treating and discharging oily wastewater, ensuring that the water samples at the outlet meet the industrial wastewater discharge requirements stipulated in the standards, improving the stability of oil treatment, and effectively avoiding environmental pollution.

[0027] The operating mode of a separator system with oil content monitoring and feedback control is as follows: After power is supplied and centrifugal pump 4 starts, wastewater in the on-site wastewater tank begins to flow. After preliminary filtration of impurities by Y-type filter 3 and scraper filter 5, it enters heater 6 for heating. Once the wastewater reaches the set heating temperature, the first and second solenoid valves 7-1 & 7-2 control the flow of wastewater into separator 8 for centrifugal separation. After separation, oil concentration detection device 9-5 at the outlet analyzes the purified water sample and feeds the results back to the control box 10 PLC. Upon receiving the feedback, control box 10 PLC controls the flow of clean water from the separator outlet back to the on-site wastewater tank or allows it to be directly discharged through the third and fourth solenoid valves 7-3 & 7-4 on the outlet pipeline. Only when the separated clean water meets the standard PPM value can it be directly discharged.

Claims

1. A separator with oil concentration monitoring and feedback control, comprising an inlet pipe connected to a wastewater tank, characterized in that: The water inlet pipe is connected to a centrifugal pump (4) and a scraper filter (5). The outlet of the scraper filter (5) is connected to a heater (6). The outlet of the heater (6) is connected to a three-way pipe. The other two ends of the three-way pipe are equipped with a first solenoid valve (7-1) and a second solenoid valve (7-2). The pipeline containing the first solenoid valve (7-1) is connected to the separator (8); the pipeline containing the second solenoid valve (7-2) is connected to the wastewater return port pipeline of the wastewater tank; The separator (8) is provided with a return water branch, and a number of solenoid valves are provided on the return water branch; all solenoid valves are connected to the electrical control box (10); the return water branch is connected to the wastewater return port pipeline; the return water branch is connected to the clean water outlet and the test water outlet respectively; an oil concentration detection device (9-5) is provided on the connecting pipeline between the return water branch and the test water outlet.

2. The separator with oil concentration monitoring and feedback control according to claim 1, characterized in that: On the water inlet pipeline, between the wastewater tank and the centrifugal pump (4), a check valve (2) and a Y-type filter (3) are sequentially provided.

3. The separator with oil concentration monitoring and feedback control according to claim 1, characterized in that: The separator (8) is connected to a separation oil outlet.

4. The separator with oil concentration monitoring and feedback control according to claim 1, characterized in that: A fourth solenoid valve (7-4) is installed on the connecting pipe between the return water branch and the wastewater return port pipe.

5. A separator with oil concentration monitoring and feedback control according to claim 1, characterized in that: A third solenoid valve (7-3) is provided on the connecting pipe between the return water branch and the clean water outlet; a fifth solenoid valve (7-5) is provided on the connecting pipe between the return water branch and the detection water outlet.

6. A separator with oil concentration monitoring and feedback control according to claim 1, characterized in that: The return water branch and the connecting pipe to the detection water outlet are equipped with a deceleration and defoaming device.

7. A separator with oil concentration monitoring and feedback control according to claim 6, characterized in that: The deceleration and defoaming device includes a damping orifice, a No. 1 shut-off valve (9-1), a filter (9-2), a vent valve (9-3), and a No. 2 shut-off valve (9-4). The damping orifice is located at the inlet of the No. 1 shut-off valve (9-1).

8. A separator with oil concentration monitoring and feedback control according to claim 6, characterized in that: The oil concentration detection device (9-5) is connected to the electrical control box (10).

9. A separator with oil concentration monitoring and feedback control according to claim 7, characterized in that: The vent valve (9-3) is located on the filter (9-2).

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