Wind power-based electric flocculation wastewater treatment system and method

Abstract

The application discloses a kind of electric flocculation sewage treatment system and method based on wind power generation, and sewage treatment system includes battery, switched reluctance pulse generator system, wind turbine, electric flocculation device, sewage circulation and separation system.The switched reluctance pulse generator system is used to output two-way pulse electric energy, one-way pulse electric energy provides pulse voltage and electric current to electric flocculation device, another pulse electric energy provides pulse current to power system.The application provides a kind of electric flocculation sewage treatment system and method based on wind power generation, optimizes the problem of high energy consumption and electrode passivation of direct current power supply electric flocculation system, can flexibly adapt to sewage treatment repetition frequency pulse power generation working condition, realizes long time off-grid independent output pulse electric energy of system;Through off-grid wind power generation, reduce the demand of power supply system to external power grid power supply, and can reduce the influence of new energy access to power grid, meet the development trend of energy saving and emission reduction, green environmental protection.

Description

Technical Field

[0001] This invention relates to an electrocoagulation wastewater treatment system and method based on wind power generation, belonging to the field of wastewater treatment. Background Technology

[0002] Electrocoagulation technology is a widely used electrochemical technology for wastewater treatment. It removes pollutants from water through a combination of flocculation, flotation, and oxidation-reduction. It is widely used to treat pollutants such as color, grease, and heavy metals in industrial wastewater, domestic sewage, drinking water, and slightly polluted seawater.

[0003] Currently, wastewater treatment is a high-energy-consuming industry. Electrocoagulation technology mainly uses DC power supply, which has problems such as high energy consumption and electrode passivation caused by long-term power supply.

[0004] Wind energy is one of the most common clean energy sources, with relatively low development costs and widespread application in the power supply sector. Therefore, wind power generation can be introduced into the electrocoagulation wastewater treatment field to reduce energy consumption. However, the large-scale integration of wind power into the grid presents technical challenges to the stable operation of the power grid. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide an electrocoagulation sewage treatment system and method based on wind power generation. This optimizes the problems of high energy consumption and plate passivation in DC-powered electrocoagulation systems, and can flexibly adapt to the repetitive frequency pulse power generation conditions of sewage treatment, enabling the system to output pulse power independently off-grid for a long time. By using off-grid wind power generation, the power system's demand for external grid power supply is reduced, and the impact of new energy access on the grid is also reduced, which is in line with the development trend of energy conservation, emission reduction, and green environmental protection.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: The present invention provides a wind-powered electrocoagulation wastewater treatment system, which includes a storage battery, a switched reluctance pulse generator system, a wind turbine, an electrocoagulation device, and a wastewater circulation and separation system; The switched reluctance pulse generator system is used to output two pulse power sources. One pulse power source provides pulse voltage and current to the electrocoagulation device, and the other pulse power source provides pulse current to the storage battery. The wind turbine provides the mechanical energy required for power generation to the switched reluctance pulse generator system. The electrocoagulation device is used to remove pollutants from wastewater; The wastewater recycling and separation system is used for recycling and separating wastewater; The battery is used to provide DC power to the switched reluctance pulse generator system and the sewage circulation and separation system.

[0007] Furthermore, it also includes AC / DC conversion power supplies; When the battery power is insufficient and the pulse power output by the switched reluctance pulse generator system is insufficient, the battery is charged by the AC-DC converter. When the electrocoagulation device stops working, the switched reluctance pulse generator system outputs pulsed electrical energy to charge the battery.

[0008] Furthermore, the switched reluctance pulse generator system includes a switched reluctance generator, a dual-channel pulse power main circuit, a control circuit, and a position sensor; The position sensor is connected to the control circuit, the control circuit is connected to the dual-channel pulse power main circuit, and the dual-channel pulse power main circuit is connected to the switched reluctance generator. The dual-channel pulse power main circuit is connected to the metal electrode and the battery of the electrocoagulation device, respectively. The wind turbine is connected to a switched reluctance generator.

[0009] Furthermore, the switched reluctance generator includes a rotor and a stator, both of which are provided with multiple salient poles.

[0010] Furthermore, the wind turbine is connected to the rotor, and the wind turbine drives the rotor to rotate.

[0011] Furthermore, the position sensor is mounted on the rotor, and the position sensor feeds back the rotor's position signal to the control circuit.

[0012] Furthermore, the wastewater circulation and separation system includes a motor drive system, a drive motor, a dirt separation device, and a circulating water pump. The input end of the motor drive system is connected to a storage battery, and the output end of the motor drive system is connected to the input end of the drive motor. The drive motor provides power to the circulating water pump, which is used to drive the wastewater to circulate and separate.

[0013] Another aspect of the present invention provides a method for operating a wind-powered electrocoagulation wastewater treatment system, which includes the following steps: Step S1: The control circuit adjusts the control parameters of the dual-channel pulse power main circuit in real time according to the change in the rotor speed of the switched reluctance generator, drives the dual-channel pulse power main circuit, and performs time-sharing control of excitation and power generation of the switched reluctance generator by the dual-channel pulse power main circuit. Step S2: The battery provides DC power to the switched reluctance generator, which is then energized. Step S3: After the excitation of the switched reluctance generator is completed, the pulse power generation stage begins, in which the switched reluctance generator provides pulse power to the metal electrodes and battery of the electrocoagulation device. Step S4: Repeat steps S1 to S3 to enter the next work cycle.

[0014] Furthermore, in step S3, when the wind turbine does not rotate or rotates at a low speed, causing the pulse current output by the switched reluctance generator to be insufficient for the electrocoagulation device to perform pulse electrocoagulation, the battery mainly supplies power to the dual-channel pulse power main circuit, and the pulse current output by the dual-channel pulse power main circuit supplies power to the metal electrodes of the electrocoagulation device.

[0015] Furthermore, in step S3, after the electrocoagulation device stops working, the switched reluctance generator stops outputting pulsed electrical energy, and the electrocoagulation device enters a waiting stage.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects: 1. The wind-driven switched reluctance pulse generator system proposed in this invention provides pulsed electrical energy to the electrocoagulation device, effectively optimizing the problems of high energy consumption and electrode passivation when DC power is applied to electrocoagulation wastewater treatment.

[0017] 2. This invention employs off-grid wind power generation, where a wind turbine drives the rotor of a switched reluctance pulse generator. No additional prime mover is required to provide mechanical energy to the switched reluctance generator, and the system can feed electrical energy back to the battery. The system has low power demand from the external grid, low operating costs, and minimal impact on the grid from renewable energy integration, aligning with the development trends of energy conservation, emission reduction, and environmental protection.

[0018] 3. When the wind turbine speed is low, the present invention directly outputs pulsed electrical energy from the battery; when the wind turbine speed is high, magnetic energy and mechanical energy are converted into pulsed electrical energy; when the electrocoagulation sewage treatment stops, the switched reluctance pulse generator system outputs pulsed electrical energy to the power system to charge the battery, which can flexibly adapt to different pulsed power generation conditions.

[0019] 4. This invention employs a switched reluctance generator, which has advantages such as simple and robust structure, strong fault tolerance and environmental adaptability, and flexible control. This invention also utilizes a switched reluctance pulse generator system, which can improve the stability and environmental adaptability of pulse power generation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the electrocoagulation wastewater treatment system based on wind power generation according to the present invention. Figure 2 This is a structural diagram of the dual-winding single-phase 8 / 8 structure switched reluctance pulse generator of the present invention; Figure 3 This is a schematic diagram showing the connection of the dual-channel pulse power main circuit and the dual windings of the present invention; Figure 4 This is a system block diagram of the electrocoagulation wastewater treatment system based on wind power generation according to the present invention; Figure 5 This is a flowchart illustrating the working method of the wind power-based electrocoagulation wastewater treatment system of the present invention; Figure 6 This is a schematic diagram of the pulse generation mode waveform of the switched reluctance pulse generator system of the present invention; Figure 7 This is a schematic diagram of the freewheeling mode waveform of the switched reluctance pulse generator system of the present invention. Detailed Implementation

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Example 1 like Figure 1 , 2 As shown, this embodiment provides a wind power-based electrocoagulation wastewater treatment system, which includes a battery, a switched reluctance pulse generator system, a wind turbine, an electrocoagulation device, and a wastewater circulation and separation system; Specifically, the battery is used to provide DC power Uin to the switched reluctance pulse generator system and the sewage circulation and separation system.

[0023] The wind turbine provides the mechanical energy required for the switched reluctance pulse generator system to generate electricity, driving the switched reluctance pulse generator within the system to rotate and generate electricity.

[0024] The switched reluctance pulse generator system converts magnetic and mechanical energy into two pulsed electrical outputs. One pulsed electrical output provides a pulsed voltage Up1 and a current Ip1 to the electrocoagulation device, causing the wastewater to flocculate under the pulsed discharge of the metal electrodes of the electrocoagulation device. This optimizes the problem of electrode plate passivation under DC power supply and improves wastewater treatment efficiency. The other pulsed electrical output provides a pulsed current Ip2 to the battery for pulse charging.

[0025] The metal electrodes of the electrocoagulation device perform pulsed electrocoagulation to remove pollutants from wastewater.

[0026] Wastewater recycling and separation systems are used to recycle and separate wastewater.

[0027] like Figure 1 As shown, the wind power-based electrocoagulation wastewater treatment system in this embodiment also includes an AC / DC converter. The input terminal of the AC / DC converter is connected to the AC mains power, and the AC / DC converter converts the external AC mains power into DC power.

[0028] When the battery power is insufficient and the pulse power output from the switched reluctance pulse generator system is insufficient, the AC / DC converter charges the battery. When the battery power is sufficient and the pulse power output from the switched reluctance pulse generator system is sufficient, the AC / DC converter does not participate in the power supply of the entire system, thereby reducing the demand for power supply from the external power grid.

[0029] When the electrocoagulation device stops working, the switched reluctance pulse generator system outputs pulsed electrical energy to charge the battery. After the battery is fully charged, it provides DC power to the system when the electrocoagulation device operates again, further reducing the demand for power from the external power grid.

[0030] like Figure 1 As shown, the switched reluctance pulse generator system of this embodiment includes a switched reluctance generator, a dual-channel pulse power main circuit, a control circuit, and a position sensor. Specifically, the position sensor is connected to the control circuit, the control circuit is connected to the dual-channel pulse power main circuit, and the dual-channel pulse power main circuit is connected to the switched reluctance generator. The dual-channel pulse power main circuit is connected to the metal electrodes of the electrocoagulation device and the battery, respectively, and the wind turbine is connected to the switched reluctance generator.

[0031] The control circuit outputs control signals based on parameters such as sewage type and generator speed to drive the on / off state of the power transistors in the dual-channel pulse power main circuit; when the power transistors are on, the windings are energized; when the power transistors are off, the freewheeling circuit is activated, entering the pulse power generation stage. The control circuit adjusts the amplitude and frequency of the pulse voltage Up1 and current Ip1 by controlling parameters such as the turn-on angle, turn-off angle, duty cycle, and phase current chopping limit, flexibly adapting to various pulse power generation conditions.

[0032] like Figure 2 As shown, the switched reluctance generator of this embodiment includes a rotor and a stator, both of which are provided with multiple salient poles. The switched reluctance generator of this embodiment can be single-phase, two-phase, or multi-phase. The salient poles on the rotor and stator can adopt various combinations of stator and rotor salient pole tooth counts, such as 8 / 8, 6 / 4, and 12 / 8. In this embodiment, a single-phase 8 / 8 combination is preferred. The stator windings can be single-winding, double-winding, etc.; in this embodiment, a double-winding form is preferred.

[0033] Specifically, in this embodiment, the stator is provided with a primary excitation winding L1 and a secondary pulse winding L2, which are concentrically arranged. The primary excitation winding L1 and the secondary pulse winding L2 are wound on the same salient pole of the stator, with the primary excitation winding L1 located in the inner layer and the secondary pulse winding L2 located in the outer layer of the primary excitation winding L1. The two windings are tightly coupled. The turns ratio of the primary excitation winding L1 and the secondary pulse winding L2 is set according to the ratio of the power supply voltage and the load voltage; in this embodiment, it is selected as 18:150.

[0034] Depending on the specific voltage and current requirements of pulse electrocoagulation, modifying the winding connection method can change the voltage and current output of the pulse generation mode. For example... Figure 3 As shown, in this embodiment, the primary excitation winding L1 uses a 4-series-2-parallel connection, and the pulse winding uses an 8-parallel connection. The primary excitation winding L1 includes two parallel excitation coil groups, each of which includes four excitation coils connected in series. The secondary pulse winding L2 includes eight pulse coils connected in parallel.

[0035] like Figure 3 As shown, the dual-channel pulse power main circuit of this embodiment can adopt different types of converters such as asymmetric half-bridge, C-dump, and dual-tube flyback converter. This embodiment preferably uses a dual-tube flyback converter, whose topology has two power interfaces: one is connected to the input AC / DC power supply or battery to realize bidirectional flow control of excitation and power generation of the switched reluctance pulse generator system; the other is connected to the metal electrode pulse load of the electrocoagulation device to output pulse power energy.

[0036] Specifically, such as Figure 3 As shown, the dual-tube flyback converter includes a first excitation-side power transistor Q1, a second excitation-side power transistor Q2, a first excitation-side freewheeling diode D1, a second excitation-side freewheeling diode D2, and a pulse-side diode D3.

[0037] like Figure 3 , 4 As shown, the specific connection method of the switched reluctance pulse generator system in this embodiment is as follows: one end of the excitation winding L1 is connected to the drain of the second excitation-side power transistor Q2, the source of the second excitation-side power transistor Q2 is connected to the negative terminal of the battery, the positive terminal of the battery is connected to the drain of the first excitation-side power transistor Q1, and the source of the first excitation-side power transistor Q1 is connected to the other end of the excitation winding L1. The cathode of the first excitation-side freewheeling diode D1 is connected to the source of the first excitation-side power transistor Q1, and the anode of the first excitation-side freewheeling diode D1 is connected to the source of the second excitation-side power transistor Q2. The cathode of the second excitation-side freewheeling diode D2 is connected to the drain of the first excitation-side power transistor Q1, and the anode of the second excitation-side freewheeling diode D2 is connected to the drain of the second excitation-side power transistor Q2. The pulse winding L2 is coupled to the excitation winding L1 through a switched reluctance pulse generator. One end of the pulse winding L2 is connected to the cathode of the pulse-side diode D3, the anode of the pulse-side diode D3 is connected to one pole of the metal electrode of the electrocoagulation device, and the other pole of the metal electrode of the electrocoagulation device is connected to the other end of the pulse winding L2.

[0038] like Figure 1 , 4 As shown, in this embodiment, the wind turbine is connected to the rotor of the switched reluctance generator, and the wind turbine drives the rotor to rotate.

[0039] like Figure 1 , 4 As shown, in this embodiment, the position sensor is installed on the rotor, and the position sensor feeds back the rotor's position signal to the control circuit.

[0040] like Figure 1 , 4 As shown, the wastewater circulation and separation system of this embodiment includes a motor drive system, a drive motor, a dirt separation device, and a circulating water pump. The input end of the motor drive system is connected to a storage battery, and the output end of the motor drive system is connected to the input end of the drive motor. The drive motor provides power to the circulating water pump, which is used to drive the wastewater to circulate and separate.

[0041] Example 2 This embodiment provides a working method for a wind power-based electrocoagulation wastewater treatment system as described in Embodiment 1, which includes the following steps: Step S1: The control circuit adjusts the control parameters (on-off angle, off-off angle, duty cycle, phase current chopping limit) of the dual-channel pulse power main circuit in real time according to the change in the rotor speed of the switched reluctance generator, and drives the dual-channel pulse power main circuit to perform time-sharing control of excitation and power generation of the switched reluctance generator.

[0042] Step S2: The battery supplies DC power to the switched reluctance generator, which then energizes the generator. During the energizing phase, as... Figure 6 As shown, during the t0-t1 stage, within the turn-on / turn-off angle, the control circuit outputs a control signal to drive the first excitation-side power transistor Q1 and the second excitation-side power transistor Q2 to conduct. At this time, the voltage across the excitation winding is the power supply voltage, and the input current Ip2 rises almost linearly; the pulse winding voltage is negative, and the pulse-side diode D3 makes the output voltage Up1 and the output current Ip1 zero.

[0043] Step S3: After the switched reluctance generator finishes excitation, the pulse generation stage begins, where the switched reluctance generator supplies pulsed electrical energy to the metal electrodes and battery of the electrocoagulation device. During the pulse generation stage, such as... Figure 6 During the t1-t2 phase shown, the control circuit outputs a control signal to turn off the first excitation-side power transistor Q1 and the second excitation-side power transistor Q2. At this time, the output voltage Up1 is positive, the pulse-side diode D3 is turned on, the excitation winding current is coupled to the pulse winding, and the switched reluctance pulse generator outputs pulsed electrical energy to the metal electrode of the electrocoagulation device.

[0044] Specifically, if the wind power is insufficient, the wind turbine does not turn or rotates at a low speed, and the pulse current output by the switched reluctance generator is insufficient to meet the current required for the electrocoagulation device to perform pulse electrocoagulation, the battery supplies power to the dual-channel pulse power main circuit, which directly outputs pulse current to supply power to the metal electrodes of the electrocoagulation device.

[0045] If the wind is strong enough and the wind turbine rotates at a high speed, the switched reluctance generator can generate enough pulse power. Then, the dual-channel pulse power main circuit simultaneously provides pulse power to the metal electrodes of the electrocoagulation device and the battery, allowing the electrocoagulation device to operate normally while charging the battery.

[0046] like Figure 6 As shown, when the electrocoagulation device stops working, the switched reluctance generator stops outputting pulsed electrical energy, and the electrocoagulation device enters a waiting phase. During the waiting phase shown in t2-t3, the input current Ip2, output voltage Up1, and output current Ip1 all drop to zero, waiting for the next working cycle.

[0047] Step S4: Repeat steps S1 to S3 to enter the next work cycle.

[0048] In particular, such as Figure 7 As shown, when the electrocoagulation device fails to operate normally and pulse electrocoagulation is not performed, the switched reluctance pulse generator system enters the freewheeling mode. During the excitation stage shown in t4-t5, the first excitation-side power transistor Q1 and the second excitation-side power transistor Q2 are turned on, and the battery provides excitation power to the switched reluctance pulse generator. During the freewheeling stage shown in t5-t6, the first excitation-side power transistor Q1 and the second excitation-side power transistor Q2 are turned off, the output voltage Up1 is positive, and because the current coupled to the pulse winding is too small, the pulse winding cannot release energy to the metal electrode, the output current Ip1 is zero, and the input current Ip2 is fed back to the battery through the first excitation-side freewheeling diode D1 and the second excitation-side freewheeling diode D2.

[0049] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wind-powered electrocoagulation wastewater treatment system, characterized in that: It includes a storage battery, a switched reluctance pulse generator system, a wind turbine, an electrocoagulation device, and a wastewater circulation and separation system; The switched reluctance pulse generator system is used to output two pulse power sources. One pulse power source provides pulse voltage and current to the electrocoagulation device, and the other pulse power source provides pulse current to the storage battery. The wind turbine provides the mechanical energy required for power generation to the switched reluctance pulse generator system. The electrocoagulation device is used to remove pollutants from wastewater; The wastewater recycling and separation system is used for recycling and separating wastewater; The battery is used to provide DC power to the switched reluctance pulse generator system and the sewage circulation and separation system.

2. The electrocoagulation wastewater treatment system based on wind power generation according to claim 1, characterized in that: It also includes AC / DC converters; When the battery power is insufficient and the pulse power output by the switched reluctance pulse generator system is insufficient, the battery is charged by the AC-DC converter. When the electrocoagulation device stops working, the switched reluctance pulse generator system outputs pulsed electrical energy to charge the battery.

3. The wind power-based electrocoagulation wastewater treatment system according to claim 2, characterized in that: The switched reluctance pulse generator system includes a switched reluctance generator, a dual-channel pulse power main circuit, a control circuit, and a position sensor; The position sensor is connected to the control circuit, the control circuit is connected to the dual-channel pulse power main circuit, and the dual-channel pulse power main circuit is connected to the switched reluctance generator. The dual-channel pulse power main circuit is connected to the metal electrode and the battery of the electrocoagulation device, respectively. The wind turbine is connected to a switched reluctance generator.

4. The wind power-based electrocoagulation wastewater treatment system according to claim 3, characterized in that: The switched reluctance generator includes a rotor and a stator, both of which are provided with multiple salient poles.

5. The wind power-based electrocoagulation wastewater treatment system according to claim 4, characterized in that: The wind turbine is connected to the rotor, and the wind turbine drives the rotor to rotate.

6. The wind power-based electrocoagulation wastewater treatment system according to claim 4, characterized in that: The position sensor is mounted on the rotor, and the position sensor feeds back the rotor's position signal to the control circuit.

7. The electrocoagulation wastewater treatment system based on wind power generation according to claim 1, characterized in that: The wastewater circulation and separation system includes a motor drive system, a drive motor, a dirt separation device, and a circulating water pump. The input end of the motor drive system is connected to a storage battery, and the output end of the motor drive system is connected to the input end of the drive motor. The drive motor provides power to the circulating water pump, which is used to drive the wastewater to circulate and separate.

8. A method for operating a wind power-based electrocoagulation wastewater treatment system as described in any one of claims 1 to 7, characterized in that, It includes the following steps: Step S1: The control circuit adjusts the control parameters of the dual-channel pulse power main circuit in real time according to the change in the rotor speed of the switched reluctance generator, drives the dual-channel pulse power main circuit, and performs time-sharing control of excitation and power generation of the switched reluctance generator by the dual-channel pulse power main circuit. Step S2: The battery provides DC power to the switched reluctance generator, which is then energized. Step S3: After the excitation of the switched reluctance generator is completed, the pulse power generation stage begins, in which the switched reluctance generator provides pulse power to the metal electrodes and battery of the electrocoagulation device. Step S4: Repeat steps S1 to S3 to enter the next work cycle.

9. The wind power-based electrocoagulation wastewater treatment system according to claim 8, characterized in that: In step S3, when the pulse current output by the switched reluctance generator does not meet the conditions for pulse electrocoagulation of the electrocoagulation device, the battery supplies power to the dual-channel pulse power main circuit, and the dual-channel pulse power main circuit outputs pulse current to supply power to the metal electrodes of the electrocoagulation device.

10. The wind power-based electrocoagulation wastewater treatment system according to claim 8, characterized in that: In step S3, after the electrocoagulation device stops working, the switched reluctance generator stops outputting pulsed electrical energy, and the electrocoagulation device enters the waiting stage.

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