The electrostatic precipitator has a history of more than 100 years. It has the unique advantages of high dust removal efficiency, wide adaptability, low operating cost, safety and reliability, easy to use and no secondary pollution. It is the first choice for industrial dust removal equipment. Faced with increasingly strict emission standards, many in-service electric precipitators have not met the requirements, and have to carry out secondary technical transformation; the new electric dust removal project to be built is also facing challenges. Although the lengthening and heightening of the electrostatic precipitator body can improve the dust removal efficiency correspondingly, the cost of equipment input and dust removal efficiency is low, and the conventional improvement method is difficult to meet the new environmental protection standards. The new high-voltage power supply has become an effective way to improve the efficiency of electric dust removal. The promotion and application of three-phase power frequency high-voltage power supply, high-frequency high-voltage power supply and pulse-stacked DC high-voltage power supply provide new possibilities and new options for improving the efficiency of electrostatic precipitators.
Power introduction
The high-frequency multi-high voltage pulse power supply (referred to as high-frequency pulse power supply) for the electrostatic precipitator is an electric precipitator power supply that can provide direct current (DC) power supply and provide DC superimposed pulse (DC+PULSE) power supply.
The high-frequency pulse power supply has a voltage superposition that can output a plurality of secondary voltage supply waveforms in combination. The electric field effective corona voltage superimposed pulse voltage (DC+PULSE) multiple control, so that the secondary voltage RMS, peak value and frequency are adjustable. The control method is flexible and adapts to various working conditions.
The electrostatic precipitator is powered by a high-frequency power supply, and the same amplitude DC voltage is continuously charged and pressurized to the precipitator, so that the line between the plates is always maintained near the breakdown voltage point. When the dust specific resistance exceeds 1011 Ω·cm, problems occur in the process of gas ionization-dust charging-moving-capturing-dusting. When the high specific resistance dust accumulates on the anode plate, the neutralization speed of the charged dust to the anode plate is recharged more quickly due to continuous pressurization, resulting in thickening of the anode plate dust layer and an increase in surface potential, resulting in a counter electrode. The potential difference is relatively reduced, the discharge electrode corona discharge is weakened, causing back-corona phenomenon, and the dust removal efficiency is greatly reduced.
The precipitator uses a high-frequency pulse power supply: pulsed power supply (DC+PULSE) is in the form of an effective corona voltage that continuously superimposes the pulse voltage while charging and pressurizing the precipitator. This charging method not only increases the instantaneous charging voltage, but also reduces the average charging voltage. Even for high specific resistance dust, the potential in the dust layer is easily neutralized on the anode plate, and the anode plate surface potential When it is lowered, the relative potential of the discharge electrode is not increased, and the occurrence of the back corona phenomenon is suppressed. The pulse wave instantaneous high voltage makes it easier to charge the dust, so the dust removal efficiency is greatly improved.
The high-frequency pulse power supply is a combination of multiple power supply modes, which can realize DC power supply, intermittent power supply, and DC superimposed pulse power supply. The pulse voltage is superimposed on the basis of the effective DC corona voltage to realize the step pulse power supply, which has the characteristics of fast pulse front time. In the fast pulse front time, an instantaneous high-intensity electric field is generated. The electron-charged motor in the pulse discharge corona field is dominated by the electric field charge and kinetic energy diffusion charge. In order to charge the particles quickly, it is effective to use a pulse with a fast pulse front. The dust charge of free electron charge is more than 50% higher than that of ion-charged dust. The high voltage pulse can increase the peak voltage of the electric field, which not only increases the instantaneous electric field strength, but also excites a large number of free electrons. The effective DC corona voltage maintains the corona voltage of the electric field, which ensures the driving speed of the charged dust, and reduces the surface potential of the dust layer of the anode plate, thereby maximally suppressing the occurrence of anti-corona phenomenon and greatly improving the electric power. The ability of the dust collector to adapt to complex working conditions such as high specific resistance dust and high concentration dust. Under the premise of meeting the dust emission standard, the energy-saving control can be realized by adjusting the waveform of the step pulse power supply.
High-frequency multi-high voltage pulse power supply for electrostatic precipitator(1) Green power supply: three-phase power supply, grid balance, no harmonic interference, high power factor, high power conversion efficiency.
(2) Multi-voltage superposition technology: multiple sets of IGBT full-bridge inverter power unit combinations realize power superposition and voltage superposition of 2+1, 3+1, 4+1 and other high-frequency pulse power supplies. Multi-voltage superposition can combine any voltage waveform shape, output a variety of DC voltage waveforms and DC+PULSE voltage waveforms to achieve pure DC power supply, intermittent power supply and pulse power supply to the electrostatic precipitator. The voltage peak and effective value are adjustable, and the electric field control mode is flexible.
(3) High frequency narrow pulse: The output frequency range is 2 kHz-40 kHz. The electrostatic precipitator is a capacitive load. The higher the power supply frequency, the smaller the electric field capacitive reactance, and the greater the energy injected by the power supply into the electrostatic precipitator. The pulse width of 8uS is more conducive to the generation of instantaneous high-intensity electric field and the aggregation of fine dust.
(4) Intelligent control: When the DC+PULSE secondary voltage waveform is set, the device automatically tracks the critical point of the electric field breakdown voltage by adjusting the frequency. The electric field is not easy to flash, achieving optimal power output.
(5) Closed-loop energy-saving control: According to the closed-loop control between the dust collector discharge concentration and the power consumption of the electrostatic precipitator, energy saving and emission reduction can be realized. The system is optimized by the host computer network.
(6) Step-down vibrating control: It has anti-corona detection function. When anti-corona occurs, it outputs the linkage signal, and depressurizes and vibrates in time.
(7) Capture of fine dust : The discharge of fine dust is a key indicator affecting the concentration of dust emission from electrostatic precipitators. The high-intensity electric field corona generated by high-frequency narrow pulse power supply greatly improves the collection of PM2.5 and below particles.
(8) High specific resistance dust collection: When DC+PULSE is used for power supply, the occurrence of back corona phenomenon is suppressed to the utmost extent, and the collection effect of high specific resistance dust is greatly improved.
(9) Desulfurization and denitrification: The high-intensity electric field corona generated by high-frequency narrow pulse power supply is more conducive to the improvement of ozone concentration and enhances the efficiency of desulfurization and denitrification.
(10) Energy-saving and emission reduction: Compared with the conventional single-phase power frequency power supply, the high-frequency pulse power supply improves the dust removal efficiency of the electrostatic precipitator by +50%, and the electricity cost decreases by -30%.
(11) Structure and protection of the whole machine: high-low pressure integrated assembly and outdoor layout saves the civil construction area of ​​the control room. Power devices such as IGBTs use box-type isolated air ducts to isolate the power devices and control unit boards from the external environment. The heat dissipation system adopts the intelligent control of the speed control fan to improve the adaptability of the high frequency pulse power supply in the outdoor high temperature environment. The control unit board is treated with a three-proof process to improve insulation and corrosion resistance. Stainless steel housing with protection class IP54.
(12) Protection functions: spark flashover, electric field open circuit, electric field short circuit, overload, under voltage, IGBT temperature, transformer oil temperature, oil level, equipment failure and communication failure.
Power circuit working principle
1, circuit composition
The high frequency pulse power supply is composed of a main circuit part, a control loop part and a high frequency rectifying transformer.
The main circuit part: consists of contactor, three-phase bridge rectifier, LC filter circuit, multiple sets of IGBT full-bridge inverter circuit, high-frequency high-voltage rectifier transformer, cooling system and so on.
Control loop part: mainly composed of DSP-CPLD control circuit, digital phase-locked synchronous circuit, IGBT drive circuit, signal acquisition circuit, relay circuit, communication interface, low-voltage interface circuit and so on.
2, the working principle
The working principle of high-frequency pulse power supply is to convert three-phase 380V, 50Hz low-voltage AC, three-phase bridge rectifier, LC filter output 520V DC bus voltage, DC bus voltage through multi-group IGBT full-bridge inverter to high-frequency pulse voltage, corresponding The respective high-frequency transformers are boosted, and the high-voltage silicon reactor rectifies and outputs 40KHz DC high voltage to provide high-frequency pulse power for the electrostatic precipitator. The controller performs automatic tracking control according to the secondary voltage and current feedback signal of the ESP load.
Application range of high frequency multiple high voltage pulse power supply for electrostatic precipitator
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