Particulate technology (electrostatic precipitator)
- 2. Ahmed Ehtisham Syed Muhammad Usman Khalid Moiz Khalil Matiullah 16103123-022 16103123-028 16103123-007
- 4. Contents: o Electrostatic Precipitator o Construction o Working o Types o Use in Industries
- 5. Electrostatic Precipitator: An electrostatic precipitator (ESP) is a filtration device that removes fine particles, like dust and smoke, from a flowing gas using the force of an induced electrostatic charge.
- 7. Principle of Electrostatic Precipitator: Electrodes at high voltage create a corona effect (ionized atmosphere) surrounding them. This charges the passing particles. Once charged, particles are subject to a transverse electrostatic force that pulls them toward the collecting plates. Plates are periodically “rapped” (vibrated) to make the collected particles fall down into a receiver basket in the bottom of the apparatus.
- 11. Construction of Electrostatic Precipitator: It consists of thin wires called discharge or emitting electrodes and other set called collecting electrodes in the form of pipes or plates. The emitting electrodes are placed in the center of pipes or midway between two plates and are connected usually to negative polarity of high voltage source. The collecting electrodes are connected to the positive of the source. Steps in the process of precipitation:- • Ionization of gases and charging of dust particles. • Migration of the particle to the collector. • Deposition of charged particles on the collecting surface • Dislodging of particles from the collecting surface.
- 12. • Precipitator casing • Hoppers • Gas Distribution System • Collecting Electrode System • Emitting Electrode System • Rapping • Reactifier
- 13. Working of Electrostatic Precipitator: Dust particles are imparted an electric charge in a corona discharge and then the charged particles are attracted in a strong electrostatic field and precipitated onto the collector electrodes.
- 18. Types of Electrostatic Precipitator: o Plate Wire Precipitator o Tabular Precipitator o Wet Precipitator
- 19. Plate Wire Precipitator: In a plate wire precipitator, gas flows between parallel plates of sheet metal and high voltage electrodes. These electrodes are long wires weighted and hanging between the plates. With each flow path, gas flows must pass each wire in sequence as it flows through the unit. The plate wire precipitator allow many flow lanes to operate in parallel and each lane can be quite tall. As a result this type of precipitator is well-suited for handling large.
- 22. Tabular Precipitator: The original ESPs were tabular like the smokestacks on which they were placed with the high voltage electrode running along the axis of the tube.
- 23. The process gas vertically enters the ESP from the bottom by means of a Gas Distribution System. The particles are electrically charged by the application of high voltage, the charged particles are transported by electrostatic attraction to the Collecting Electrodes, where they are subsequently flushed off periodically by a flushing system. Wet Precipitator:
- 25. Applications of Electrostatic Precipitator: Pollution control in Industrial Processes.( Chemical industries, Petroleum industries, etc. Static electricity is used in pollution control by applying a static charge to dirt particles in the air and then collecting those charged particles on a plate or collector of the opposite electrical charge. Handles very large gas volumes and heavy dust loads with low pressure drop. In many industrial plants, particulate matter created in the manufacturing process is released as dust in the hot exhaust gases. If released into the atmosphere, the particulates reduce visibility, can contribute to climate change, and lead to serious health problems in humans, including lung damage and bronchitis. Fine particles that are smaller than 2.5 microns (0.0001 inch) in diameter can be especially dangerous because they are drawn deep into the lungs and can trigger inflammatory reactions. Electrostatic precipitators are important tools in the process of cleaning up flue gases.
- 35. Inside View of Electrostatic Precipitator
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