Air Pollution Control

Need Electrostatic Precipitator Spares? Know The Common Components

For someone not aware of the term yet, Electrostatic Precipitator or ESP is basically a filtration device which helps in controlling emissions of minute particles in industries. Their primary task is to use induced electrostatic charge to remove fine particles from flowing gas. Approach any electrostatic precipitator manufacturer and choose from a wide range of equipment according to your requirement. Whatever is the size and design of your ESP, there are a few common components a majority of these models contain. They are known as spare parts.

5 Basic Components Or Spare Parts Of Electrostatic Precipitator

  • Discharge And Emitting Electrodes

This is regarded as the most vital component of the device as it affects its performance. The discharge electrodes are generally fabricated from annealed copper wire tubes of smaller diameter. They can generate high corona as the welded wires vertically hang in the electrode. They generate electrical fields of ionize and high power flue gas.

  • Collecting Electrodes

Sheet metals are generally used to manufacture this component. The negatively charged particulate matter is attracted by the surface and so one can easily use them to treat gases of large volumes. Some of them are designed in such a way so that they can collect particulate matter with higher efficiency.

  • Insulators

Insulators help in mechanically discharging electrodes and isolating them. They are generally used in ground casings as they are the high voltage systems of the device. They are specially designed so that they can back the load of the electrodes. Non-conducting materials are used to make them which make them durable.

  • Hopper Discharge Systems

This is one of the most important Electrostatic Precipitator Spares as it helps in removing the dust collected in the hopper. The functioning of your hopper discharge system can either be automatic or manual. The dust is collected through electrostatic discharge which helps in cleaning the hopper within the shortest span of time.

  • Rapper Coils

If you are willing to get rid of the dust from emitting and collecting electrodes, the rapper coils are exactly the components you need. They can deliver shear forces with huge strength. The electrodes are hit at fixed time intervals which dislocates the dust particles. You can adjust the rapping intensity according to your requirement.

Since you are now aware of the common components of an Electrostatic Precipitator, it’s time you change the faulty parts with new ones or change the device entirely.

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A few important facts about electrostatic precipitators

You may have heard about different types of useful technologies to ensure air purification. UV light, fibreglass or HEPA filters, activated carbon and a lot more. Each of them uses a specific strategy to remove particles and thus purify the air. Electrostatic precipitators are technologies for air purification mostly used to clean industrial fumes though now they are used for residential air as well.

Let’s have a quick look at some important points to know about an electrostatic precipitator.

Basic working principles

Basically, this helps to purify the air by means of electrostatic force for grabbing and holding dust as well as other particles. The tool consists of wires and collection plates along with high voltage through an electrostatic field between wires and collecting plates to charge the air electrically while ionizing them during the process. While airborne particles like pollen or dust flow between the plates, those particles become charged and that causes them to get attached to the plates. And then the air flows through leaving those particles behind. The entire process results in clean and purified air. Particles collected in the plate are shaken loose and then scraped off or washed away. This process ensures disposal of airborne particles in an eco-friendly manner.

Electrostatic precipitation is a highly organised method for filtration of fine particles from sinuous gas. Such precipitators are able to manage a large quantity of air without causing significant slowing down in the flow rate. However, while choosing an electrostatic precipitator (ESP), you must keep in mind the purpose of buying it. For example, the ESP used for kitchen must be different from the one used in industrial units. Extraction of air from the kitchen is a complex process as this air is a complicated compound mixture of grease, smoke, water vapour and temperature. So for your kitchen, you should choose one that is explicitly designed for kitchen environment instead of a non-specific industrial ESP.

Types of an electrostatic precipitator

Mainly two types of electrostatic precipitators are available in the market. They provide different levels of air purification. Let’s have a look at how they work.

  • Plate precipitators – This is the most common type of ESP. This contains a row of vertical wires that provide the particles with a charge while the collecting plates collect and hold the particles. This basic, two-stage design (first charging and then collection) ensures reduced ozone production that can be otherwise harmful if inhaled. This type of ESP is specifically beneficial for those working in close proximity to the device.
  • Wet precipitators – This is another widely used type of precipitator. This is also called a WESP or a Wet Electrostatic Precipitator. This device is mostly used for removal of liquid droplets like sulfuric mist from the industrial steam. WESP uses a typical tubular design to let the collected particles and moisture form a thick combination. This model comes really handy for content holding a huge quantity of moisture or containing combustible particles.

Benefits

  • Ensures up to 99 percent molecule removal
  • Minimum pressure drop
  • Collected particles may be improved for further processing

Discussed above are some important factors that you must know before using an electrostatic precipitator.

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.

Electrostatic Precipitator, Its applications, Advantages, at Industrial Zones in India

According to world Health Organisation 2015 report, around 7 million premature deaths take place due to air pollution.

And 10 thousand people are dying at the age of around 40 because of toxic fumes. Thousands of children become asthma patients at the age of six only.

And according to a forecast according to the Constance growth of dying, by the year of 2050, there must be a scarcity of pure drinking water due to the lack of sanitation.

The most air polluted “hotspots” have been found in the biggest metropolitan cities, rather can say, the industrial areas of the most metropolitan cities in this country.

According to another statistical report air has been polluted due to cheap and poor quality supply of coal in most industrial areas. And this leads to India being  one of the leading pollutant regions in the whole universe.

The Big Smoking Zone of the Country:

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Industrial areas are the backbone of every country. So, before thinking  to stop industrialization, that is the most common thinking of masses, think pragmatic to reduce pollution without getting hazard the industry and their prosperity.

Lack of exposure to sunlight children get affected in rickety or various bone deficiency diseases as the smog in air of these areas block sunlight. A permanent smoke haze has already enveloped some areas of Delhi, Patna, Gwalior and Raipur.

According to the “smoke control laws in India” apart from banning tobacco smoking in public zone or creating an extra smoking zone in railway stations or airports, it is mandatory to install Electrostatic Precipitator in every industrial zone of this country.

A little talk about Electrostatic Precipitator.

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It has been used from 1900 and was first initiated by Dr. Frederick G. Cottrell in 1907. Now it is widely acclaimed by every industrial and commercial areas in India as the most proficient machinery that purifies air.

Application of Electrostatic Precipitator:

Apart from the various advantages, this apparatus works in the most proficient way to reduce toxic levels of the environment. It has potential to take away 99.9% of dust particles that is very beneficial for the welfare of eliminating health hazards.

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Advantages of Electrostatic Precipitators

  • Manages massive gas level and dust, especially smog with less pressure
  • Can easily systematize mordant and wet equipment
  • Low expenses
  • It can last for several years
  • Hassle-free upholding
  • Collection efficacies even for tiny elements

Key Components of Electrostatic Precipitator Include

  • Release electrodes
  • Precipitator control
  • Wash out air systems
  • High voltage power supply
  • Spray washing systems

Layout of Electrostatic Precipitator

The preliminary cost of this equipment is quite expensive, when you purchase it for the first time. But, the best part is, its maintenance cost is very cheap and reasonable. The classification is recognized for its permanence and will surely last for several years. One of the best things about ESP is that you don’t need to purchase substitute filters. On the other hand, the ion charged plates has to be cleaned from time to time automatically for optimal performance. Electrostatic precipitator provides almost no wind resistance and doesn’t require any form of pushing control unlike other models.

 

In conclusion, what need to talk about, after giving the detail aspects of this must need equipment is, it is the most fundamental job to install it in all industrial zone. And we need to know its reimbursement in a vast level.

 

Electrostatic Precipitators: Way to Kill Industrial Flue Gas

industrial air pollution

Okay, ‘electrostatic precipitator’ is way too technical. Let’s call these machines the scrubbers. They are inherently static-electricity filters, designed to steal dust, soot, ash, and grime from industrial smoke. It goes without asking that they contribute to the minimisation of air pollution. Yes, they are a technological marvel.

Want To Know How A Scrubber Works?

Comb your hair vigorously on a cold, dry day, You’ll notice that the strands cling on to the teeth of the comb. Well, that’s static electricity.

ESPAs the comb rubs against your tresses repeatedly, the electrons break free from them and settle on it instead. At this point of time, your hair is positively charged and the comb negatively. This explains the weird attraction.

Something of the like happens in a scrubber as well. Industrial smoke is actually an aerosol. It may look like gas, but the properties are different. That’s solid suspended in a gaseous medium. The suspended particles are unburned carbon.

The idea is to ‘rub’ the particles so that they receive an electrical charge. These when passes through a medium with the opposite charge, can be pulled out and removed.

Simple, right? Wrong.

There’s more.

Industrial smoke, aka flue gas, is forced through two electrodes inside a smokestack. The negative electrode imparts negative electrical charge to the suspended particles. The second electrode is the positive one and located up or beyond the negative electrode. They attract the charged particles.

Until this point, it is more or less similar to the hair strands attaching to the comb. However, the challenge is to get rid of the pulled particles from the electrode, which is also known as the collector plate.

It needs to be shaken from time to time so that the older particles are emptied and there’s room for newer particles. This can be done manually by brushing or, automatically using an automated shaker or rapper, after which, the particles are disposed of.

ESP at a industry

What Are The Typical Activities Of A Scrubber?

If we go by the above explanation of how a scrubber works, here are the six typical activities that take place inside it:

1. Ionisation – The particles are charged.
2. Migration – The particles are taken to the collector plate.
3. Collection – The particles are collected onto the collector plate.
4. Neutralisation – The particles are neutralised on the collector plate so that they fall.
5. Dislodging – The particles are dislodged onto a hopper.
6. Removal – The particles are carried from the hopper for disposal or recycling.

Which Particulate Properties Affect Electrostatic Precipitators?

Various electrostatic precipitators are designed for particles of various sizes, chemical compositions, and amounts. Here are the two most important aspects of suspended particles that normally affect these scrubbers:

• Electrical resistivity
• Particle size distribution

Other aspects include:

• Temperature of the flue gas
• Its moisture content
• Overall design of the machine
• Whether the rapper is manual or automated
• Whether single-stage or multi-stage scrubbing
• Whether the removed particles should be disposed of or recycled.
• Heterogeneity of the pollutants that the flue gas contains

So, now that you know the scrubber inside out and the loads of environmental benefits it brings, why not have it installed in your industrial plant as well? Like they say, let the machine take care of the machine while we enjoy a good life.