Electrostatic precipitators gas vs electric oven


Dust collection systems play an integral role in ensuring that certain industrial manufacturing processes, such as those conducted at steel and paper mills, do not release harmful amounts of industrial dust. To do so, dust collection systems must contain dust or remove it from an air stream. However, dust particles can range in size from barely visible to substantial, solid particles. Because dust can range in both size and form, different dust collector systems can be used alone or in conjunction to prevent the dangerous circulation of dust during a manufacturing process. Collectors such as inert separators, centrifugal collectors, and fabric collectors can be used to eliminate dust from an air stream, while wet scrubbers offer an equally efficient alternative that depends on the introduction of water. Electrostatic precipitators , highly efficient dust collector systems, can function with or without water and are applicable to a wide array of highly dust productive operations.

An electrostatic precipitator typically consists of several elements: a power supply, an ionizing source, a dust removal method, and an external enclosure. There are two main inlets, one to allow the entrance of a polluted (dusty) air stream and one that facilitates the exit of the clean air stream at the end of the cleaning process. The enclosure itself houses equipment to collect and discharge the dust. Normally, the device casing can be made from steel or reinforced plastic. The internal elements of an electrostatic precipitator work together to remove dust from the air stream, contain the removed dust, and release the clean air stream.

The primary force used to separate dust from an electrostatic precipitator is electrostatic force. In a basic dry electrostatic precipitator, direct current high-charge electrodes alternate with grounded collecting electrodes, creating an ionized field. As the air enters the chamber the stream passes between the different kinds of electrodes, becoming negatively charged. Once negatively charged, these particles latch on to the positively charged grounded electrodes, where in they lose their charge. Next, the removed material is simple shaken loose from the electrons by vibration, and the dust and dirt is collected.

In a wet electrostatic precipitator, water is introduced to the system via spray nozzles located above the electrodes. As the electrodes attract dust particles, the water weighs down the particles and forms a wet layer over the collection plate. Additionally, the water cleanses the plate of all the removed dirt, making the cleaning process easier.

Aside from wet and dry electrostatic precipitators, the devices are also distinguished from one another by the collection plate. Plate precipitators and tubular precipitators both use charged electrodes to attract dust, but the manner in which they then trap and remove dust is different.

Plate precipitators are the most common method of electrostatic dust collection. In a plate precipitator, discharge electrodes are aligned along the central axis of two spaced plates. As the gas particles pass between the plates, the particles become charged and are attracted to the electrodes on the plate. To remove the dust particles (now securely attached to a collection plate), the plates are lightly vibrated to shake the dust loose. This method is most commonly found in basic dry electrostatic precipitators.

Tubular precipitators are another common method of collecting dust, but the process takes place in a cylinder. Inside the cylinder, collection electrodes are placed along the axis of the cylinder. As the contaminated air flow cycles around the inside of the cylinder, the dust latches on to the electrodes and collects along the axis. Once the dirt is shaken loose, it is removed from the bottom of the cylinder.