Electrostatic Precipitators

Know the Different Varieties of Useful Air Pollution Control Devices

Pollution, particularly air pollution has been a bane to the world for many decades now. With rapid industrialisation that is underway in most countries right now, air pollution is at an all-time high with no sign of decreasing any time soon. Fortunately, there are certain devices that control air pollution and effectively ensure that it does not reach alarming proportions. Discussed below are the different types of devices for controlling air pollution about which you should know.

Here are the Types of Devices for Air Pollution Control

  • Cyclone Separators

Cyclone Separators

What a cyclone separator does is to basically use inertia to get rid of particulate matters from the gases that go out of the ducts, or flues. These devices work on the principle wherein the flue gases go into a chamber that houses a tornado-like vortex. Due to the difference in weight between the light gas particles and the larger particulates, the former goes up the cylindrical chamber and exit while the heavier and larger particulates impact with the walls of the chamber and fall down.

  • Electrostatic Precipitators

Electrostatic Precipitators

This is considered by many to be the best device for controlling air pollution. An electrostatic precipitator or ESP works by using static electricity to separate ash and soot from the fumes, before letting it go out of the pipes and ducts. The particles of carbon that are left unburned are extracted out of the smoke with the help of the static electricity within the precipitators. With the help of electrostatic precipitators’ spare parts, one can ensure that they are never letting out polluting gases into the environment.

  • Fabric Filters

fabric_filter_luss

One of the most basic forms of air pollution control devices, fabric filters, as their name suggests, uses some sort of fabric (usually felt) to trap the particles of dust before the gas goes out from the smokestacks. In comparison to the previous two methods, this technique may seem rudimentary, but it is quite effective nonetheless and does its job rather well.

  • Incineration

Incineration

Another device that is true to its name, incineration involves the conversion of VOCs, volatile organic compounds into CO2 and water through the means of combustion. This combustion occurs in specialised equipment known as ‘afterburner’. The afterburner is made in such a way that it can create the necessary conditions for combustion, including the high temperatures that are required.

  • Carbon Capture

1453902_CCS

There is a theory that states that carbon dioxide can be captured and stored in geologic layers to prevent it from going out into the atmosphere. A carbon capture device puts this theory into practice. However, this is one of the more rarely used techniques but there are discussions about it constantly as a means to curb the emissions of greenhouse gases.

These are the types of air pollution control devices that are most extensively used. Their necessity in today’s world is unquestionable, and any way to limit air pollution should be considered and put into practice without too much thought.

Advertisements

Know More About Electrostatic Precipitators And Its Control Techniques

The easiest way to remove particles from a gas stream is by using an electrostatic precipitator. Electrical energy is used to charge those particles negatively or positively before they get attracted by the collector plates which are generally of the opposite charge. The collected particles become dry in the collector plates and can be easily removed or washed with water. Not everyone using the procedure is aware of the fact that the collection efficiency of ESPs is more than 99 percent and this is why they are widely used in various industries.

Its Various Components

The four common components you will generally find in an electrical precipitator are discharge electrodes, rappers, collection surfaces and gas distribution plates. These plates comprise of numerous plates which are perforated to maintain and properly distribute the air entering the gas stream.

The discharge electrodes in a majority of the ESPs are divided into 3 or 4 fields. The larger electrodes are divided into around 14 fields which are generally found in series. A solo transformer-rectified set power supply is sufficient to energise those electrodes and create ions. The ions dashes with the particles in the incoming gas stream and applies an electrical charge. The charged particulate matter then collects on the plates or pipes which can be later removed using the rapping system.

Types Of Electrostatic Precipitators

There are generally two types of ESPs, namely dry ESPs and wet ESPs. What differentiates these two is the method through which the plates where the particles collect are cleaned. Vibrations or mechanical impulses are used to loosen the collected particulate matter and clean the dry ESPs from the collection plate. To remove wet ESPs, you have to rinse the collector plate thoroughly using water. Using this wet method becomes necessary when the particles accumulated in the gas streams are sticky and have low resistivity.

ESP Performance And Particle Resistance

For someone not aware of the term, ‘particle resistivity’ is basically the property of the particles that can influence the process through which they deposit or is removed from the collection plates. This is why resistivity of the particles can affect the performance of Electrostatic Precipitators drastically. Moderate resistivity is regarded to be the ideal situation when the particles can automatically accomplish some of their charges after reaching the collection plate. This prevents the inhibition of other deposited particles and makes them capable of retaining their charge while holding them lightly on the plate.

It takes longer for the particles to conduct away their charge if the resistivity of the particles is higher. As a result, a negative charge builds up on the plate which inhibits the other deposits. If the resistivity is too low, the particles will start losing their own charge once they reach the collection plate and start attracting charges from the plate. This will make the negatively charged particles deter back into the gas stream.

Since your knowledge about electrostatic precipitators has enhanced, it’s time you start looking for a reliable company who can take care of all your ESPs needs.