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In the process of abrupt electric field ionization air generating activity 0 and combining with 2 to 3, the electric energy output by the pulse power source is only 7%~14% for the generation of 3, and the rest are all heat loss. Low power utilization efficiency High process cost is the main obstacle to the application of ozone water treatment technology. The key to solving the problem lies in improving the ozone generation method.
60Hz) and fixed intermediate frequency (400~600Hz) variable voltage power supply have been improved in recent years. With the development of power electronics technology, the production of high frequency power supply has become simple. 3 High frequency power supply technology (1~100kHz) is adopted. Many advantages: strengthen the ozone synthesis process; reduce the volume and weight of the device; reduce the operating voltage of the generator; better reliability and durability when the generator yield is constant. Research shows that the power supply is used in high frequency applications of various pulse waveforms. The square wave or pulse waveform with high frequency fast rise is better than the traditional sine wave to synthesize ozone. In addition, the power supply generates a large amount of heat energy due to discharge, and requires a good heat dissipation process.
2 High-pressure pulse discharge method Water treatment technology 2.1 Basic principle It is easy to realize high-energy high-voltage technology to deal with refractory industrial wastewater is one of the current research hotspots. The application of high-pressure narrow pulse in the gas-water phase mixing system can achieve gas corona discharge plus voltage amplitude of 10kV, rise time ns high voltage pulse, corona discharge generated electron temperature up to several hundred degrees, and ions and neutral gas The temperature is close to normal temperature. The water droplets surrounded by this non-equilibrium plasma are subjected to four kinds of effects at the same time: 1 high-energy electron bombardment; 2 sterilization of 3 pairs of water droplets generated by corona discharge; 3 ultraviolet radiation generated by discharge to photochemical treatment of water droplets; 4 discharge plasma The production of certain active free radicals (0H groups, etc.) in their combination makes the refractory industrial wastewater achieve rapid purification. The high-pressure pulsed discharge plasma water treatment technology directly reacts the ozone produced by the discharge with water. The program of the traditional ozone water purification technology is simplified, the device is miniaturized, the attenuation of the 03 mass concentration with time is avoided, and the purification effect of the active particles generated by the discharge is exerted, and the application prospect is good.
2.2 Technology Key 2.11 Design of High Voltage Narrow Pulse Power Supply When designing pulse power supply, it must be noted that: 1 power supply reliability design, the focus is on circuit heat dissipation and electromagnetic compatibility design. Because the high-frequency discharge of the power supply generates a large amount of thermal energy and electromagnetic interference. 2 Improve the power efficiency. 22.2 Plasma generation method The method of generating non-equilibrium plasma during high-voltage pulse discharge is very important. There are three design principles: 1 space utilization is as large as possible; 2 increase the contact area of ​​plasma (and O3) with water as much as possible; 3 can be used to process continuous flow of water. The commonly used plasma generation methods are: Taylor cone discharge method, mist discharge method 491, water bubble discharge method 101, water Membrane silent discharge method, etc. Among them, the mist discharge method and the bubble discharge method in water can make the plasma (and O3) generated by the discharge fully contact with water, and the most application prospect is that the 3 pulse electrolysis water treatment technology initially uses the DC power supply to electrolyze the sewage, and the waste water is treated. The consumption and anode loss are large, and the process cost is high. Therefore, after the failure to obtain a wide range of applications, the power and anode losses are significantly reduced, the anode of the plate is oxidized, and the treatment effect is unstable. DC power supply is obviously excellent. "1213.1 Basic principle Wastewater composition is more complicated. The actual water treatment process is usually redox, electrolyzed air floatation and electrocoagulation. The research status of 3.2 pulse electrolysis power supply is very much reported about pulse electrolysis power supply (PEP). R shown in the GTR pulse power supply design scheme 11, is a chopper, the circuit uses a DC level to compare with the reference triangle wave and then outputs a drive signal to control the GTR on and off to convert the DC power supply E into a pulse output power supply to change the DC level. The size can adjust the pulse width of the pulse power supply; changing the frequency of the triangular wave can adjust the frequency of the pulse power supply. The pulse width and pulse frequency are adjusted separately to meet the electrical parameters of the pulsed power supply for different wastewater treatments. This PEP uses a power frequency transformer and a choke inductor, and has a large volume and weight. The PEP system diagram is 12, the system is first The rectification filter obtains the DC voltage, and then the error signal formed by the pulse output feedback adjustment loop is obtained by the Buck power converter. The PWM generator controls the switching tube to turn on and off, so that the DC voltage is stabilized at the set amplitude, and the modulation signal is controlled by the microcomputer. Issued, timely blockade PWM switch The pulse power supply suitable for electrolytic purification of sewage is not yet mature. When designing PEP and its control system, it should be noted that in order to reduce the volume and weight of the power supply, high frequency must be realized, but high frequency also causes The power tube is turned on and off, and the loss is increased. Therefore, it is necessary to improve the power supply efficiency. It is necessary to use the diode switching and capacitor filtering in the soft switching technology to cause severe distortion of the input current. As a result, the harmonic pollution of the power grid is severe and the switching power supply is reduced. The power factor of the pulsed power supply is lower than that of the DC power supply. When the switch Q is disconnected, the power output is attenuated to zero with the discharge of the inductor and capacitor. When the lockout signal is cancelled, the power supply is restarted and the output voltage is re-established, thereby forming a power pulse at the output. Due to the use of high-frequency switching power supply technology, the power supply is efficient and light, suitable for industrial wastewater and oily sewage treatment. Various types of sensors are fuzzy. Inference electrical parameters I processing W electrolytic water purifier fuzzy control principle block diagram 4 improve power supply adaptation In practical engineering applications, the composition of sewage is complex and variable, so it is necessary to improve the adaptability of the power supply, so that it can be automatically adjusted under different sewage treatment conditions to ensure that the output waveform can satisfy the purification result and the electrolytic purification of sewage. It is very difficult to establish an accurate mathematical model, and fuzzy control does not need to establish a mathematical model of the control object. It is only necessary to establish a model of the control system through language description. The control strategy is determined by a predetermined value provided by an experienced operator. For the fuzzy control principle of the basic electrolysis water purifier, firstly, the membership degree of each linguistic variable is determined according to the measured values ​​of various sensors, and then the electrical parameters (including the pulse frequency pulse duty pulse amplitude) and the processing time are automatically selected by the fuzzy controller. Automatically complete the whole process of sewage purification by the best purification scheme The fuzzy linguistic variables of the process include the degree of pollution of the sewage (severe, general, light), the amount of sewage (large, medium, small), the nature of the sewage (such as printing and dyeing wastewater, oily domestic sewage), the core of which is to establish a reasonable fuzzy rule base, so a large number of Process experiments to study the relationship between sewage treatment effect and electrical parameters. The fuzzy control method can reduce the power consumption per unit of water treatment, and improve the automation degree of the sewage treatment process. Workers should wear a full set of shielding suits and apply insulation tools. After entering the equipotential, the high potential maintains a safe distance of > 1.2 m with the grounding member. The ground potential electrician on the tower structure should also wear a full set of shielding suits. When transferring tools to the equipotential electrician working on the maintenance line or cooperating with the work, it should also be carried out by insulating tools and should be kept safe with the repaired line >1.2m. When the distance is determined by the insulation rod or other operations, the minimum effective insulation length of the insulation rod should be >1.2m. The distance between the exposed part of the human body and the conductor should be >Q 3m or more to ensure the safety of the maintenance personnel.
2) Grounding potential maintenance mode When the two ends of the repaired line are grounded, the grounding potential can be operated on the power failure maintenance line segment, that is, the operator does not need to use the high-potential insulation tool when entering or leaving the serviced line, and it is not necessary to consider the grounding member. The safety distance between the electricians on the tower and the electrician on the wire do not need to limit the use of insulation tools. However, both the electrician on the tower and the electrician on the wire must wear a full set of protective clothing or electrostatic protective clothing (including conductive shoes), which can be used to: 1 shield the space strong electric field; 2 maintain the same potential as the wire or grounding member To avoid electrostatic shock, 3 when contacting the metal tool on the transmission rope, the shielding suit can bypass the static induction current to prevent the "mass electricity" from causing a secondary accident. The operator does not allow contact until the two ends of the line are grounded. The line should be kept at a sufficient distance. Only when the two ends of the line are well grounded and the operator hangs the portable short-circuit grounding wire through the insulating tool at the working point, the installation step of the portable circuit can be touched. Reliable grounding, then hang the other end on the wire and make it in good contact. The dismantling procedure is the opposite. 5 Conclusion A500kV compact double-circuit line on the same tower should be grounded for another time. If both ends of the maintenance line are not grounded, In the maintenance circuit, there will be power frequency induction voltages of up to several tens of volts; if one end of the line is grounded, the induced voltage is < 1kV;
lifting capacity: 0.5t-10t
lifting height:6m-30m
Pulse power sewage treatment technology
The deterioration of water environment quality has made traditional water treatment methods challenging, and related sewage treatment technologies have gradually become a research hotspot. This paper discusses the application and development of pulsed power wastewater treatment technologies such as ozone generation, high pressure pulse discharge and pulse electrolysis. Ozone (3) is a highly oxidizable gas that is soluble in sewage and passes through pollutants in water. Compared with other common oxidants (such as Cb, NaClO, etc.), the reaction has the advantages of colorless, no odor, no strong corrosiveness and toxicity, low cost and easy availability of raw materials (air), and current use, especially in use. No secondary pollution will increase the oxygen content in the beneficial area.