The electrofilter removes the incombustable parts of the coal, which are carried in the fluegas stream as flyash. The fluegases stream after leaving the steam generator, coming from the air preheater, in the electrofilter through parallel, 30 cm wide openings. These gases are formed by plate-formed positively charged electrodes. Electrically isolated spray electrodes are suspended on which a negative voltage is applied. Under the influence of the electrical field the flow ash settles on he positve plate electrodes.
Existing plant consist of a fixed- bed reactor which was originally designed as a two zone reactor operated with Benzene feed. The existing Benzen Feed System was to be modified to mix super heated butane with air and to feed a uniform air-butane mixture to the reactor instead of benzene. Atmospheric air is filtered and compressed to 2.35 bar by motor driven centrifugal air compressor. The Start Up Heater is not used normally. However for plant startup, it is used to preheat the compressed air to the desired temperature.
