The recent study predicts that the utilization of conventional fuels for the power production rise up in two decades. The combustion of these fuels releases most harmful gases, and sulphur compounds to the atmosphere. We all know that many harmful particulates are coming out from several industrial sectors such as Coal based thermal power plants, sintering plant , cement kilns, etc. Relying upon the nature of coal, the plenty of minute particles exhaust out after the combustion process: like aluminum oxide, ferric oxide, Silicon dioxide. So for controlling particulate emission, many traditional cleaning appliances are in practice such as bag filters, cyclones, scrubbers, bed filters. But. one of the effacious method of controlling the emission of these particulates is using ESP.
The working principle of a precipitator is divided into three fundamental steps. Electric charging of the suspended particles A high tension rectifier impresses a D.C Voltage of 30-70KV between the discharge electrodes and the collecting electrodes, depending on the nature of the process and the design of the precipitator. The discharge electrodes emit ions for the electric charging of the dust particles. Collection of the charged particles in an electric field under the influence of strong electric field, charged dust particles migrate towards the collecting electrodes. Removal of the precipitated dust When a certain amount of dust has accumulated on the surface of the collecting electrodes, it is made to fall down into the bottom hopper of the precipitator and is extracted.
We can conclude that an ESP is a device that plays a crucial role in the process of dust elimination before they are exposed to the environment. Problem of air pollution from particulate emission has recently shifted from micro to nano range. Continuous research and development in the field of emission control has lead the ESPs to be most economical and efficient way to control different types of emissions with tremendously high efficiencies. Despite of its high capital investment ESP is necessity of present and hope for future.