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CE-2036-ENVIRONMENTAL-IMPACT-ASSESSMENT-OF-CIVIL-ENGINEERING--PROJECTS--->View question


Asked On2017-06-07 08:44:01 by:manjarimattur

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1)Electrostatic Precipitators:
    Electrostatic precipitators (ESP) are particulate collection devices that use electrostatic force to remove the particles less than 5 micron in diameter.  It is difficult to use gravity settlers and cyclones effectively for the said range of particles.  Particles as small as one-tenth of a micrometer can be removed with almost 100% efficiency using electrostatic precipitators.
    The principle behind all electrostatic precipitators is to give electrostatic charge to particles in a given gas stream and then pass the particles through an electrostatic field that drives them to a collecting electrode.

2)spray towers:
A spray tower (or spray column or spray chamber) is gas-liquid contactor used to achieve mass and heat transfer between a continuous gas phase (that can contain dispersed solid particles) and a dispersed liquid phase.

3) Cyclones:
       Settling chambers discussed above are not effective in removing small particles.  Therefore, one needs a device that can exert more force than gravity force on the particles so that they can be removed from the gas stream.  Cyclones use centrifugal forces for removing the fine particles.  They are also known as centrifugal or inertial separators.
       The cyclone consists of a vertically placed cylinder which has an inverted cone attached to its base. The particulate laden gas stream enters tangentially at the inlet point to the cylinder. The velocity of this inlet gas stream is then transformed into a confined vortex, from which centrifugal forces tend to drive the suspended particles to the walls of the cyclone. The vortex turns upward after reaching at the bottom of the cylinder in a narrower inner spiral. The clean gas is removed from a central cylindrical opening at the top, while the dust particles are collected at the bottom in a storage hopper by gravity.

4)Pipe type :
   In the pipe type electrostatic precipitators, a nest of parallel pipes form the collecting electrodes, which may be round, or square.  Generally the pipe is about 30 cm in diameter or less. Most commonly a wire with a small radius of curvature, suspended along the axis of each pipe, is used. The wires must be weighted or supported to retain proper physical tension and location, electrically insulated from the support grid and strong enough to withstand rapping or vibration for cleaning purpose. The gas flow is axial from bottom to top.
    The pipe electrodes, may be 2-5 m high. Spacing between the discharge electrode and collecting electrode ranges from 8-20 cm. Precipitation of the aerosol particles occurs on the inner pipe walls, from which the material can be periodically removed by rapping of pipes or by flushing water. The pipe type precipitator is generally used for the removal of liquid particles.



Answerd on:2017-06-27 Answerd By:prajwalamv

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