Research And Design Of Some Structure Problems For Super Large Electrostatic Precipitator(ESP)

In recent years,with the increasing installed capacity of thermal power generating units,the haze in Beijing,Tianjin,Hebei provincebecomes more and more serious.As a result,the requirements of pollution control at national and local levels are increasing year by year,as well as the requirements for dust emission in flue gas.Electrostatic precipitator(ESP),as a kind of traditional dust collector and flue gas purification equipment,has the advantages of high dust removal efficiency,low resistance,large amount of flue gas treatment,high temperature resistance and low operation&maintenance cost.Started with the basic principles of electrostatic precipitator,we can realizethe conventional electrostatic precipitator upsizing to meet the high dust emissions and stringent emission standards by increasing the dust collection area in the paper.The paper has summarized the research status of conventional ESP at home and abroad,and introduced the design principle and main structure of the conventional ESP according to theDeutschformula.Then,it has put forward that the ultra-low emission can be realized afterthe conventional ESP is upsizing.At the same time,the paper lists the solutions to the key technical problems in the application of the super large ESP in order to apply the project to practice.Based on the mechanism and operation condition of conventional ESP studying,the paper aims at some potential problems,including the determinationof hopper volume after ESP upsizing in multiple electric fields,the selection of plate and wire matchin multiple electric fields,the thermal expansion problems after ESP upsizing.By analyzing the ESP theory and the dust collecting efficiency from actual test reports,the paper gives the current and voltage characteristics of the electric fields in different plate and wire match types by experimental studying,and the problem of uneven thermal expansion caused by temperature gradient by structural coupling simulation using the finite element method.According to the above research and analysis,the paper puts forward corresponding solutions to the key problems of ESP.Combined with the above research results,thepaper has verified the design theories through practical engineering of some India projects.After this large ESP put into operation,the owners of the relevant units has conducted a performance test,which show that the upsizing ESP can meet the requirements of the agreement and achieved a lower emission.The test has proved that the large ESP gives a new solution to solve the strict emission requirement in China.In this paper,the related research for ultra low emission in China put forward a new solution,opened a new situation for the sustainable development of ESP.