Research On Flow Uniformity Of Electrostatic-bag Precipitators And Pressure Characteristics Of Perforated Plates

Pollution emissions from the thermal power industry occupy a significant portion of China's air pollution emissions.In recent years,with the promulgation of the "12th Five-Year Plan" and other policies,as well as the voice of the masses constantly increasing,coal-fired power plants continue to develop more stringent emission standards,research and development of ultra-low-emission new technologies,and constantly promote the development of energy-saving emission reduction and environmental protection industries.As the main equipment of particle pollution emission control in the thermal power generation industry,the dust collector is widely used for its large flue gas treatment capacity,high dust removal efficiency and wide applicability.Combined with electrostatic precipitator and bag dusting technology,the electrostatic-bag precipitator saves running costs,increases dust removal efficiency and effectively prevents secondary ash lifting.It plays an increasingly important role in practical application of power plant pollution.However,as the ash content of coal-fired coal used in thermal power industry in our country decreases and the viscosity increases,more and more scholars begin to study how to reduce the pollutant emission in a cost-effective way and increase the dust efficiency of the precipitator.The distribution of internal airflow is one of the most important factors that affect the precipitators,and is usually adjusted by perforated plates and baffles.However,in the past,the research work mainly focused on the gas flow distribution of a single perforated plate.There are few experimental studies on the factors that affect the perforated plate resistance.In addition,the conclusions mainly focus on the tests of cold single-phase flow,and lack of experimental results for high-temperature environments that simulate the actual situation.For this reason,this paper designs a model test similar to the prototype and scaled down.The ways of regulating airflow distribution inside the precipitator and the influences of different factors on the resistance characteristics of the perforated plate under different simulated flow field conditions were studied respectively.The main work is as follows:First of all,according to a 2×350MW power plant's electrostatic-bag precipitator we reduce the scale and build a model test to study the dust distribution within the airflow.We design and optimize the perforated plate with different perforated plate combination plan,install a flow adjustment plate that can adjust the angle of the deflector,and study the regulation effect of different adjustment modes on the airflow distribution inside the precipitator.Then,in order to study the resistance characteristics and influencing factors of porous plates in different simulated environments,a corresponding model test system was made.We study porosity,relative thickness and other factors on the resistance characteristics of perforated plates by changing the parameters of the perforated plate;we study fluid temperature,Reynolds number and other factors on the perforated plate resistance characteristics by changing the system conditions.Finally,simulating the actual environment of the power plant.By changing the temperature,the change of the resistance characteristics of the perforated plate under different actual temperature was studied.