Research On Pulse Power Supply Technology For Electrostatic Precipitation

Electrostatic precipitator is widely used in the field of industrial waste gas treatment.In many dust removal methods,the metheod of electrostatic dust removal are widely used in the industry by the advantages of simple,efficient and easy to maintain and many other advantages.Eighties and nineties electrostatic precipitator from Europe and the United States and other developed countries was introduced to China.The emission standards is the 50~200mg/m3.The standard can not meet the current strict standards,electrostatic precipitator innovation is imperative.Compared with the traditional frequency power supply,pulse dust collector using high-voltage pulse charge within a short time.This method is easier to remove fine particles,especially high-specific resistance fine particles of dust,effectively inhibit the anti-corona,it can achieves low low exhaust emissions.At the same time,the pulsed power supply can improve energy utilization,it is the research hot spot in the domestic and international electrostatic precipitator domain.First of all,this paper has carried on the mathematical modeling to the dust removal process of the electrostatic precipitator.Taking into account the charge accumulation of the dust collector,the electrostatic precipitator ideal efficiency formula is modified.And the dedusting process of DC superposition pulse dust collector was studied.The influence of DC base voltage and pulse peak voltage on pulse dust removal process was obtained.Secondly,this paper presents a new design method of DC superimposed impulse power supply for high voltage side power supply of DC superposition pulse power supply.The mathematic model was established,and the Laplace transform was used to analyze the mathematical model.Modal analysis was carried out on the normal working,flashover and spark states,the relationship between the voltage and current in the extreme case is obtained.The mathematic analysis,standard unitization and the influence of parameters on the normal working mode are analyzed to reveal the important parameters in the design of the circuit,and the theoretical basis of the design of DC superimposed pulse power supply is presented.Thirdly,this paper studies the power supply of DC superimposed pulse power supply.The full-bridge LCC topology is chosen as the high-frequency resonant power source.As the high-frequency highvoltage transformer has a large parasitic parameters,and there is a certain connection between the size of the parasitic parameters and the number of turns and winding the winding process.Therefore,LCC resonant converter using high-frequency high-voltage transformer parasitic parameters,so that the switching device achieve soft switch.Study two DCM modes of converter,compare and analyze average output current,peak value of resonant current,voltage regulation characteristic,soft-switching characteristic and so on.It is concluded that the DCM-1 mode is more suitable for high-voltage electrostatic precipitator.Finally,a small DC superimposed pulsed electrostatic precipitator and LCC power supply were set up to verify the system experimentally.The correctness and feasibility of DC superimposed impulse power supply and LCC power supply system are verified by system parameter design,software simulation and hardware experiment.Experimental waveform and simulation and design expectations are basically consistent,marking the theoretical analysis of the correctness and rationality of parameter design.This paper provides a theoretical analysis and design method for DC superimposed pulsed electrostatic precipitator applied in the field of electrostatic precipitator.It is of significance and reference value for the application of DC superimposed pulse electrostatic precipitator power system in the field of precipitator.