Electrostatic Precipitator

How Does An Electrostatic Precipitator Reduce Air Pollution?

With e-wastes filling landfills all over the world and the exponential increase in fuel-burning vehicles on the highways, it’s high time we take measures to reduce air pollution. More than just smoke, the quality of air is linked to everything – from global warming to childhood asthma.

Electrostatic Precipitator

Wondering about the ways to make a difference in society? Using electrostatic precipitators (ESPs) can be a great solution!

Tackling pollutants in the air is vital since poor quality of air has harmful effects on human health, especially the cardiovascular and respiratory problems. Turning a blind eye to the rising problem of air pollution can not only risk human health but also impact the health of the planet for the generations to come. And, using an electrostatic precipitator can be a great step to get started for improving the air quality in your home, community as well as the society at large.

Here’s everything you need to know about ESPs!

How Does An Electrostatic Precipitator Work?

Electrostatic smoke precipitators are one of the most efficient ways of eliminating particles and do not cause any significant pressure drop across the unit. They work by removing smoke and particles from a gas stream by means of an electrostatic charge. The dust particles go past the wires which boast of a high direct current voltage applied that ionises the adjacent gases. It is this corona release which causes the particles to pick up a small electrostatic charge.

How Effective Are Electrostatic Smoke Precipitators?

With air pollution controls becoming increasingly stringent, even smoke precipitator technology is evolving to keep pace. The state-of-the-art precipitators can remove the majority of the particulates in flue gas by moving at a typical speed.

Factors On Which The Dust Collection Efficiency Of An ESP Depends

  • Particle Size Distribution

This is a key aspect which affects the dust efficiency of an electrostatic precipitator. The size of the aerosol you wish to collect in the ESP even determines the dust collection efficiency of the device. Make sure you consider the size of both the device and the aerosol.

  • Concentration Of Aerosol

The dust collection efficiency of a device largely depends on the aerosol concentration. Since the aerosol consists of both mist and dust, the concentration of gas in it differs a lot. So, if you want the value of aerosol concentration to remain the same at the device’s outlet, ensure the aerosol concentration is higher at the inlet.

Now that you are aware of everything, what are you still here for? It’s time to tackle air pollution with electrostatic precipitators.

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Important Things You Should Know about an Electrostatic Precipitator

Electrostatic precipitators (ESPs) are basically filtration devices designed to remove minute particles like smoke and dust from exhaust gas systems in a bid to ensure a clean environment. These devices are quite large ones and various industries use them for the above roles. While the machinery is quite popular in industrial circles, there is, in fact, a very small population that knows about electrostatic precipitators. Discussed below are the finer details about how an ESP works, its applications, and what the benefits are of these large machines.

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Key Points to Know About Electrostatic Precipitators

  • Uses and Applications

Electrostatic Precipitator is widely used by steam and thermal power plants to get rid of fly-ash from the utility boiler emissions. With ever-growing stringency imposed by governments to ensure that the air is as pollution-free as possible, the demand and use of ESPs are on a constant rise. They are often used as the primary source of smoke and dust collection, but in some cases, ESPs play second fiddle to cyclone collectors. This is because there are some minor limitations to ESPs when it comes to filtering high amounts of carbonated gases.

  • How does it Work

The dusty gases are ionised when passed through oppositely charged conductors under high voltages of around 30-60kV. This passing through the charged electrodes creates positive and negative ions. The ionised gas is then passed through a collecting unit that comprises metallic plates, which are charged and earthed alternatively. As these plates are grounded, highly intense electrostatic fields exert a force on the dust particles that are positively charges which are driven towards the ground plate. The particles thus deposited on the plates are gotten rid of by shaking the plates with the help of externally driven cams, and the particles removed are finally collected in dust hoppers.

  • Benefits

The obvious benefit of an electrostatic precipitator is the betterment of the environment by reducing the pollutant emissions of various factories. It is also the preferred choice for various industries due to the fact that the maintenance costs are lower compared to other collecting systems. The ease of installation and operation of these machines are another point in the favour of ESPs. They collect the dust particles in a dry form, but it can be removed in either wet or dry forms.

These are some of the most important things to know about electrostatic precipitators. With the added emphasis on green and clean solutions for the environment, the application of these machines is soaring.

What Are The Advantages Of Using Electrostatic Precipitator Parts?

With the ever-increasing concern of pollution all over the world, are you planning to install equipment which can eliminate the harmful dust particles from the exhaust gas stream? Electrostatic Precipitator (ESP) can be a great choice. Wondering what makes this equipment so beneficial? Read on.

Electrostatic Precipitators

ESPs are highly efficient equipment and have the ability to remove smoke and dust from the airstream by interfering minimally with the flow of gases through the device. These use a high-intensity electric field for ionising the dust particles in the airstream and the particles are then collected by oppositely charged collectors. Widely used in the elimination of fly ash from boiler power plants, ESPs are now a major addition in power supply industries.

Below are a few advantages to installing ESPs!

Electrostatic Precipitator Part: 4 Advantages Of ESPs In A Thermal Power Plant

  1. Collection Of Both Wet And Dry Pollutants

Electrostatic precipitators are available in two kinds – wet and dry. Dry ESPs are used for collecting various dry pollutants such as cement particles and ash. On the other hand, wet ESPs are used for removing wet particles such as oil, tar, resin, paint and everything that is not dry conventionally.

  1. High Efficiency Of Removal Of Pollutants/Particles

The efficiency of an electrostatic precipitator part depends on numerous factors such as the corona power ratio, the resistance of the particles, etc. The efficiency of an ESP is very high for the elimination of particles under normal circumstances. It is believed that this industrial equipment can remove up to 99% of the total dust particles. ESPs have relatively high collection efficiencies over a varied range of particle sizes.

  1. Low Operating Costs

Not only are electrostatic precipitators easy to operate, but they even come with low operating costs. The operating costs for ESP are very low, making it an affordable option for all. What makes these your ideal option is that they are economically feasible in the long run. This advanced equipment can stand the test of time and require little maintenance.

So what are you still here for? Time to get an ESP installed in your thermal power plant!

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.

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.

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 Precipitator – To a Smokeless Mother Nature, with Love

The earliest date attempt of filtering suspended particles from gases and aerosols was first made by a scientist named Dr. Frederick Cottrell in the years 1906. The invention of the device, thus, is a result of this man’s attempt and the world owes to him big time. Evidence for his work is the US Patent 895, 729, which was filed in 1097 stating the work.

The patent described how suspended particles could be removed from every kind of industrial fume, smoke, and dust using high voltage electrodes. An interesting part of Cottrell’s patent reveals how the technique can be used for the destruction of fog and mist on land and also in water.

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How does this device work?

Dirty flue gas is allowed to pass through two electrodes in the electrostatic precipitator. These electrodes are wrapped in metal wires and placed inside a pipe. The receiving electrode is negatively charged and the emitting electrode is positively charged.

The particles in the flue gas that passes through the device are attracted by the negative charges and attain the negativity. These particles are then attracted by the positively charged electrode due to their difference in charges. What comes out is only clean, fresh air.

The particles are removed using collecting plates at regular intervals via shaking, brushing, or automated cleaning processes like rapping. Some devices have additional fabric filters, which help in the removal of large-size soot particles.

Why is static electricity effective on smoke?

No matter how strongly you support the notion that smoke is gas, the fact cannot be denied that it is an aerosol. Yes, most aerosols contain liquid droplets. You’ve seen them in perfumes and air fresheners.

But, smoke as an aerosol contains soot particles instead. Whatever be it, smoke is liable to the influence of static electricity. These particles can be charged and removed from the flue gas. The high voltage which is applied can ionise the particles and separate them from the source.

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What are the types of electrostatic precipitators available in the market?

The designs vary in the sense that they can separate particles of different size and chemical make-up from different volumes and types of flue gas. For instance, if a power plant burns excessive coal, the device has to be designed keeping in mind the chemical composition of the same.

Yet again, there are power plants that need to lower the emission of sulphur dioxide and ash which are generated during production processes. Devices for this purpose should be upscale in size.

Further, it also depends on the law of the area in which the device is being used. If the rules for air pollution control are very stringent, power plants running in the area might require multiple devices working simultaneously to clean air.
Lastly, the accessories are important, too. For instance, if your factory processes demand a huge amount of dust and smoke to be cleaned at frequent intervals, the device must be designed in such a way that it supports automated rapping systems.

What are the typical applications of the device?

• Gas production plants.
• Cement and limestone production plants.
• Iron and steel production plants.
• Chemical and metallurgical production plants.
• Coal boilers.
• Biomass fired boilers.
• Sludge incinerators.

The end story is, if there’s a device that can keep industrial air pollution under control, it definitely has to be an electrostatic precipitator. It’s efficacious, economical, and very much advantageous. It’s an invention devised exclusively for Mother Nature with love.