This dust is periodically cleaned with the help of washing system. Due to ionization, the dust particles in the gas flow gets separated and agglomerate to the existing dust on the collecting surface. High voltage is applied between the discharge electrodes and collecting plates/tubes. The SS discharge electrodes are placed at the Centre of these honeycomb type collecting tubes In this case, like in case of dry type ESP, the collecting electrodes are replaced with honeycomb type tubes, which acts as collecting plates. The processed gas enters the wet ESP horizontally at the bottom and is spread uniformly across the entire cross section by means of gas distribution system. The other main important component of the ESP is High Voltage Equipment, commonly known as Transformer Rectifier (TR Set), which determines & controls the strength of the electrical field generated between the discharge & collecting electrodes. A gas screen is provided at outlet to trap the last fine particles which were not able to get attracted to collecting plates. While leaving the gas from the last field, more than 99% of the dust is separated and clean gas is sent out of ESP in guided way to avoid turbulence. It is further discharged through Rotary air lock valve either to mechanical conveying system or pneumatic conveying system. The dislodged dust gets collected in the hopper. But the finer particles require more current to charge and hence more numbers of fields are required so that the partially charged particles can get charged in next field and can be separated from the gas stream. The coarser dust particles are easy to ionize and hence gets separated easily. Each field has different current ratings to catch the finer particles. Thereafter, depending on the dust conveying system, it gets transported to the storage system of the plant.ĭepending on the application and other various design parameters, the ESP has number of fields to achieve the desired cleaning efficiency. With the help of profile, it gets guided to slide down to the collecting hoppers. When the hammer impacts the collecting electrode row, it creates jerk and the dust layer is dislodged from the surface. To avoid back corona of discharge electrodes, a separate tumbling hammer type rapping system is provided above the discharge electrodes suspension system. Each row of the collecting electrodes is cleaned separately with help of tumbling hammer type raping system. The collected dust is dislodged through the impact given at the bottom of the collecting electrodes. The dust particles get charged and gets attracted towards collecting electrodes. The collecting electrodes are placed at 400 mm. The electrical field consists of collecting electrodes and discharge electrodes, which are suspended from top and are electrically separated with the help of support insulators. Here the gas velocity is reduced substantially and is distributed evenly across the cross-section of electrical field with the help of gas distribution screen which are mounted in inlet cone.įurther, the gas enters the first electrical field of ESP. The dust laden gas enters the ESP through the inlet cone. Dust content at inlet & outlet of ESP/strong>.Apart from this, there are many parameters which affect the sizing of the ESP such as: The migration velocity is an extremely important parameter to decide the size of the ESP and helps to determine the efficiency. Our ESPs are optimally designed, tailor-made to suit the customer operating conditions. Independent rapping systems are used to clean the collecting as well as discharge electrodes. These electrodes are cleaned with the use of robust tumbling hammer type rapping system. When the dust particles touch the collecting electrodes, it loses its charge, but due to agglomeration, they still stick to the plate. The charged dust particles are attracted towards the profiled collecting electrodes. These negative electrons accumulate on dust particles and thus dust particles are charged negatively. The discharged electrodes emit electrons when charged with high negative voltage. The gas is equally distributed and made to pass through these gaps of electrodes across width and length. The discharge electrodes are charged with negative high voltage and the collecting electrodes are earthed. The dust laden gases are passed through the electrical field consisting of profiled collecting electrodes and discharge electrodes.
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