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Air Pollution Control Equipment

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Introduction

This article will take an in-depth look at air pollution control equipment.

You will understand more about topics such as:

  • What is air pollution control equipment?
  • How does air pollution-control equipment work?
  • Considerations when choosing air pollution control equipment
  • History of air control equipment
  • Types of air pollution control equipment
  • Applications of air pollution control equipment
  • Maintenance tips for air pollution control equipment
  • Air pollution prevention tips
  • And much more......

Chapter 1: What is Air Pollution Control Equipment? How Does it Work? Considerations When Choosing This Equipment

The term "air pollution control devices" refers to equipment that stops a range of solid and gaseous pollutants from entering the atmosphere, primarily through industrial smokestacks. These controls can be divided into two categories: those that limit the emissions of acidic gasses and those that limit the quantity of particulate matter that escapes into the environment.

Air Pollution Equipment

How Does Air Pollution Control Equipment Work?

There are three possible ways that air pollution control technology can operate:

  1. Chemical Modification: A hazardous chemical is changed into an inert chemical in this technique. Typically, a flue gas desulphurization electrostatic precipitator is used to do this. Selective catalytic reduction methods are another control that aids in nitrogen oxide cleanup. These control the emissions of nitrogen oxide from stationary sources and the process of selective non-catalytic reduction, which converts nitrogen oxides (NOx) into molecular nitrogen (N2). Technicians may use carbon adsorption, scrubbing, and condensation to recover materials if VOCs have a value for recovery. If not, technicians may use biofiltration, thermal oxidation, or catalytic oxidation.
  2. Contaminant Destruction: This air cleaning method requires high enough boiling points to burn away compounds with extremely high boiling points, making it the most challenging.
  3. Hazard Removal: The most prevalent and straightforward air purification method is to eliminate hazards from the air. There are numerous ways to accomplish this, but air filter systems are typically used.
Working Principle of Air Pollution Control Equipment

Things to Consider When Choosing Air Pollution Control Equipment

Since the operational environment and conditions vary from one facility to another for a particular classified source, selecting the proper monitoring equipment or method entails more than just performance comparisons and basic costs. Every installation and facility requires a different type of monitoring equipment, and the decision is made based on several factors.

Rotary Concentrator Airflow Diagram

Considerations when choosing Air Pollution Control Equipment:

  • Before deciding, it is crucial to consider the physical and chemical characteristics of the pollutant and waste gas stream because they differ.
  • Monitoring equipment must be compatible with the system for which it will be used; carefully review the regulatory or permitting restrictions and other related reporting requirements.
  • How and where samples are collected, processed, and disposed of affects the chosen equipment.
  • They ought to adhere to standards for calibration and accuracy.
  • Quality is the most important consideration when selecting monitoring equipment; make sure the quality satisfies the quality control standards.
  • All equipment needs maintenance. Make sure maintenance service is easy.
  • The monitoring must not obstruct the management and safety system.

All these elements will aid in purchasing monitoring equipment to meet the needs.

Chapter 2: History of Air Pollution Equipment

The Industrial Revolution started when air pollution first became a problem. Pollution and industries both resulted from the development of the global economy. Pollution was produced as a result of burning fuel released from industrial process equipment and as a result of the creation and maintenance of industrial processes. Additionally, as the industries grew, natural resources like wood, coal, water, land, etc., were overused.

By the middle of the 20th century, people started to notice the effects of unrestrained industrialization. For instance, air pollution in Donora, Pennsylvania, which had reached deadly levels, resulted in the deaths of 20 people and the illness of 7,000 more in 1948. London underwent a period known as "The Great Smog" in 1952. This thick, impenetrable fog resulted from sulfur particles combined with the gasses from burning coal. In addition to animals, 12,000 people perished during the five-day haze. An air pollution disaster brought on by the Union Carbide factory in Bhopal, India, in 1984 resulted in the sickness or injury of between 150,000 and 600,000 residents as well as the death of close to 4,000 manufacturing workers.

Governments worldwide have implemented various clean air regulations to combat these horrible catastrophes. For instance, the UK government enacted the first Clean Air Act in 1956. This halted the burning of coal in cities. In 1970, the United States adopted its own Clean Air Act.

People started employing different air cleaner equipment created much earlier after passing such legislation. One was the electrostatic precipitator, which German mathematician Dr. M. Hohlfeld created in 1824. Around 80 years later, in 1907, Professor Frederick Gardner Cottrell obtained a patent for the first mass-producible electrostatic precipitator. At that time, a precipitator captured, treated, and eliminated sulphuric acid.

The Clean Air Act of 1990 made periodic monitoring of some specified pollutants at various stationary sources a requirement. Monitoring equipment is just as crucial as pollution control equipment to comply with legal restrictions and monitoring requirements. Data on particulate matter and gaseous pollutants are kept with monitoring equipment, which is crucial for auditing and obtaining licenses for new and existing plants. Additionally, it is crucial to monitor emissions to evaluate the effectiveness of the pollution control system and the health and safety conditions inside the plant.

The commitment of many people has resulted in a significant reduction in VOC and HAP emissions during the past few years. However, global climate change has brought carbon emissions to the forefront of concern. As a result, policymakers and environmentalists are collaborating to draft legislation to reduce carbon emissions drastically. Given these recent and impending laws, manufacturers may need to be ready to discover alternatives to incinerators and oxidizers. These alternatives include filtering system components like mist collectors, wet scrubbers, dry scrubbers, electrostatic precipitators, etc.

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Chapter 3: Types of Air Pollution Control Equipment

Continuous Emission Monitoring Systems (CEMS)

Many facilities use continuous emissions monitoring systems (CEMS) tools to monitor, control, and report emissions. Various instruments are employed as monitoring equipment to directly measure the concentration of particulate matter and gaseous chemicals at various locations. These are frequent spots in a stack or duct. They also take note of a waste gas stream's physical characteristics, such as opacity. The New Source Performance Standard (NSPS) and the New Source Review (NSR) all call for the monitoring of emissions at large sources of pollution. Additionally, some EPA requirements mandate continuous emissions monitoring.

Along with parametric monitoring, continuous emissions monitoring aids technicians in adhering to the compliance assurance monitoring (CAM) rules.

Continuous Emission Monitoring System

Parametric Monitoring

Emissions are measured in parametric monitoring by monitoring important parameters related to the operating status of process equipment or air pollution control equipment.

Pollutant emission levels and monitored control parameters form the basis of parametric monitoring.

The CAM regulation has helped parametric monitoring gain some acceptance because it is a more adaptable and affordable method for demonstrating compliance.

Carbon Absorbers

Another oxidizer is a carbon absorber, also known as an air scrubber. They function by filtering polluted air as it passes over or through an activated carbon bed. The carbon bed absorbs and traps the VOCs as the air stream passes, releasing only clean air.

Many different processes and valuable materials, including lithium hydroxide, sodium hydroxide, amines (such as monoethanolamine), minerals, and zeolites, can be used in carbon absorbers (ex., serpentinite).

Carbon Absorber System

Air Scrubbers

It is an air purification system that filters or cools the airstream as it enters the scrubber to remove particulate matter from the air. Wet and dry air scrubbers are the two varieties distinguished by how they remove particles. An air scrubber's main purpose is to purify the air after it has been polluted with harmful gasses, chemicals, fumes, and pollutants.

Air Scrubber

Wet Air Scrubbers

Wet air scrubbers employ liquid solvents, while dry scrubbers use solid materials to remove pollutants. Both eliminate associated odors and gas contaminants from industrial exhaust streams. Wet air scrubbers often remove more pollutants from the air than dry air scrubbers do. As they prevent pollutants from contaminating outside air, they are essential for industrial manufacturing or wastewater treatment plants. Wet air scrubbers can come in various shapes and sizes and can be used in any industry that releases air pollutants.

Wet Air Scrubber

With water or a water-based solvent, wet air scrubbers work by absorbing contaminants. The contaminated gas enters the wet scrubber from the bottom, moves upward via the packed bed, and the downward-moving solvent sprays. Before the gas leaves the scrubber, it travels through a mist eliminator to catch any droplets. The contaminants are caught in the solvent droplets. In a metal or composite container, the liquid solvent is contained. The solvent is passed through by contaminated gas. As it does so, the scrubber emits clean gas while the solvent absorbs the pollutants.

The solvent's composition impacts how well it can remove impurities. The electric charge of the solvent is a crucial component. The solvent's ability to bond with various inorganic contaminants depends on its charge, which might be positive, negative, or neutral.

Dry Air Scrubbers

To target specific contaminants, dry air scrubbers quickly spray chemicals into the exhaust stream. Pollutants fall out of the air stream due to the reaction between the reagent and the pollutants. A dry air scrubber is environmentally benign since the collected particles and the spray is either burned off in the heat of the air stream or caught in a filter.

A dry air scrubber requires no removal or storage of wastewater, making operation more cost-effective. Dry scrubbers are primarily used to catch solvents and acidic vapors.

Dry Air Scrubber

Electrostatic Precipitators

These filterless devices remove particles from the air that are solid, droplet-shaped, gaseous, or liquid using an electric charge. It is a tool for reducing air pollution that filters pollutants out of the smokestacks of factories, manufacturing facilities, and power plants. The electrostatic precipitator collects smoke or gas as it exits a burner or furnace by passing the gas or smoke over wires or plates. This process gives the gas or smoke a static charge, which is then collected on a second plate with a negative charge, where the pollutant particles are held. With only a small quantity of electrical energy, electrostatic precipitators can be precisely tuned to meet the requirements of the pollution circumstances.

Most enterprises produce their goods using fossil fuels, which causes smoke to be released into the atmosphere that comprises soot, ashes, and unburned CO2. Using an electric charge, electrostatic precipitators (ESPs) remove the soot, ashes, and unburned carbon dioxide from the smoke and release clean air or smoke into the sky. Since these dangerous particles can harm people, the environment, and structures, extraction of these particles is crucial.

Particulate matter from contaminated air is removed using electrostatic precipitators. Dust, smoke, soot, ashes, and fumes are a few examples of the various types of particulate matter.

Electrostatic Precipitator

Oxidizers

Oxidizers utilize thermal decomposition, also known as incinerators, to treat waste gasses or plant emissions that include dangerous chemicals. The preheated waste gas is oxidized in oxidizers, which resemble burners or reactors and operate at temperatures of up to 1832 °F (1,000 °C).

Thermal oxidizers convert HAPs and VOCs with organic or hydrocarbon bases into carbon dioxide and water. The waste gas stream is first introduced into the combustion chamber while a high-draft fan provides air. The supplied air volume is kept at levels that will burn the flammable substances. The air is supplied in addition to producing complete combustion to dilute the waste gas stream to safe levels. Unless a suitable concentration monitoring system exists, where the maximum LEL can be extended to 50%, the (LEL) at the combustion chamber must be at most 25% for safe operation. The chamber and the vent system may explode if the LEL of the waste gas compounds is reached.

The combustion chamber's combustible gas concentration should not exceed 25% of the lower explosive limit (LEL) to operate safely. However, upstream monitoring can occasionally allow for up to 50% deviations. The waste gas stream is ignited in the combustion chamber after diluting it. The gas is burned using a guided burner or igniter. The heat produced is minimal because the gas is diluted with air. Additional auxiliary fuel is pumped into the system to maintain chamber temperatures if the combustion is not self-sustaining.

Some oxidizers can burn continuously without the use of additional fuel. For instance, catalytic oxidizers use catalyst media—a substance that speeds up a chemical reaction without depleting itself—to help the reaction. As a result, there is reduced fuel consumption and a lower operating temperature than with a thermal oxidizer. To save even more energy, air-to-air heat exchangers may preheat the input air with the hot, treated exhaust gas at the output.

Utilizing the chamber's exhaust heat is another approach to raising the temperature inside the chamber without consuming a lot of extra fuel. The heat energy in the exhaust gasses after burning would be lost if discharged immediately. Instead, heat is transferred from the intake air stream to the exhaust air stream using heat exchangers. As a result, less heat is needed to ignite the warmed air that enters the chamber. The air can be warmed up using ceramic media inside the combustion chamber.

The heat from the earlier reaction is absorbed by the ceramic media and transferred to the entering stream of gasses.

Through a stack, the exhaust gasses are vented into the atmosphere. A stack is typically built to naturally transfer air from the combustion chamber. First, several sample-taking probes are arranged in a row along the stack. Then, systems for monitoring emissions process the samples.

Additional downstream or stream equipment is required due to the possibility of acid-forming substances and particle debris in the waste gas stream. Scrubbers, particularly wet ones, are a common option for removing acid vapors.

A strong electric field is used by wet electrostatic precipitators (WESP), a method of controlling particulate matter, to charge and collect particles and droplets onto a collection surface. As a gas stream passes through the collection section, a discharge electrode charges the particles negatively. As a result, the particles are drawn to the grounded surface of the collection electrode by their negative charge. WESPs function at low-pressure drops and remove over 90% of the collected material.

Catalytic Oxidizers

Catalytic oxidizers use high heat or elemental additions to burn VOCs.

Thermal oxidizers extract oxygen from volatile organic compounds (VOCs) by soaking contaminated air in platinum or palladium. Non-toxic byproducts like nitrogen and oxygen are produced throughout the process.

Either of these processes could be regenerative or recuperative. Because it enables companies to recycle heat and save expenses, this feature benefits industrial manufacturing facilities in the agricultural, mining/geochemical, pharmaceutical, auto, and other sectors that lose money running pollution control systems inside and outside.

Catalytic Oxidizer

Regenerative Thermal Oxidizers

Ceramic heat transfer beds are used by regenerative thermal oxidizers (RTOs) to recover as much of the energy emitted during oxidation as is practical. Usually, this amounts to 90% to 95%. The first step of the procedure is heating the entering waste gasses directed by control valves. The intake temperature is then increased from the ambient level to levels close to combustion. Less heat transfer occurs because the ceramic bed cools down as the incoming gasses absorb the most heat. The control valves then divert the intake flow to another heated ceramic bed. Finally, to be ready for another heating phase, the cold ceramic bed goes through a heat regeneration phase from the exhaust gasses.

Regenerative Thermal Oxidizer

Recuperative Oxidizers

In contrast, recuperative oxidizers warm-up polluted gas in an energy recovery chamber using shells, tubes, plates, or another type of traditional heat exchanger. By using the energy released by oxidized VOCs, they can sustain themselves. Through the heat exchanger, the operation begins by raising the temperature of the incoming waste gas. After burning, the mixture of waste gas and the air is released to the stack after passing through the other side of the heat exchanger. Next, the heat exchanger increases the intake temperature by recovering heat from the exhaust. There are two types of heat exchangers: plate, and shell and tube. Thermal oxidizers with plate heat exchangers have higher thermal efficiency at lower operating temperatures and need less capital investment. On the other hand, heat exchangers with shells and tubes are favored at higher operating temperatures.

Recuperative Thermal Oxidizer

Direct-Fired Thermal Oxidizers

The simplest thermal oxidizers are direct-fired thermal oxidizers (DFTO), commonly referred to as afterburners. They don't use preheating or heat recovery techniques when introducing the waste gas stream into the combustion chamber. Instead, the hot air stays in the firing chamber for a predetermined period after entering, known as the residence or dwell time.

When the desired thermal destruction rate efficiency (DRE) is obtained, the firing chamber operates at 1800 °F to 2200 °F (982-1204 °C) with airflow rates of 500 cu ft to 50,000 cu ft. Emissions are controlled during this time. Safe air and water vapor are released once the DFTO has processed the emissions. The least amount of capital is required to achieve emission compliance with DFTOs, which have a 99% efficiency rate for destroying hydrocarbons.

Direct-Fired Thermal Oxidizers

Flameless Thermal Oxidizers (FTO)

This thermal oxidizer uses specially created non-catalytic ceramic beds with good thermal and flow dispersion qualities. Unlike other thermal oxidizers, this one premixes the air and waste gasses before introducing them to the combustion chamber. Burners or earlier processes preheat the combustion. When the air and gas mixture enters the combustion chamber, the high temperatures cause them to ignite. Burners and electric heaters are used to heat ceramic media to operational temperatures when the exothermic reaction of the air and gasses is insufficient.

Flameless Thermal Oxidizer

Mist Collectors

Mist collectors, often known as mist or moisture-eliminator filters, are air pollution management tools that remove moisture and vapor from gas streams, such as smoke, oil, mist, etc. The liquid droplets are separated from the gas using fine mesh filters, which are then collected in a different chamber for processing and, possibly, recovery and reuse.

With some types delivering 99.9% efficiency for particles with a diameter of less than 0.3 mm, mist collectors maintain high filtration efficiencies for submicron liquid particles. Mist collectors can process caustic and acidic gas streams. However, they cannot process gas streams with large particulates because they could clog the collector's filter. Additionally, they are not employed in applications where the temperature exceeds 120 °F (48 °C).

Mist Collectors

Cyclone Dust Collectors

Cyclones, also known as cyclone dust collectors, are air pollution control tools that separate dry particulate matter from gaseous pollutants like air filters. Cyclones, however, use centrifugal force to collect and remove particulates rather than a filtration medium. Gas streams enter a cyclone and move through the cylindrical chamber in a spiral motion. Large particles are propelled against the chamber wall by the swirling motion, which reduces their inertia and causes them to fall into the collection hopper below for additional processing and disposal. Upward and out of the cyclone, the cleansed gas streams continue.

With larger or smaller particle sizes, efficiency rises or falls correspondingly. After cyclones are in an air pollution control system, smaller particles are typically removed using other filtering devices, such as baghouses.

Cyclone Separator

Catalytic Reactors

Selective catalytic reduction (SCR) systems, also known as catalytic reactors. These air pollution control technologies are frequently used to reduce nitrogen oxide (NOx) emissions caused by the combustion of fossil fuels in industrial applications. The industrial exhaust and pollutants are initially exposed to ammonia, which interacts with the NOx molecules to create nitrogen and oxygen. These devices, like incinerators, also use different catalysts that allow some lingering gaseous pollutants to proceed through combustion for additional processing and reduction. For example, the three-way catalytic converter in a car's exhaust system is used to lower the levels of NOx, CO, and other VOCs in the engine emissions, making modern autos one typical place where catalytic reactors are utilized.

SCR systems can achieve more than 90% efficiency for reducing and removing NOx, while other gaseous pollutants can achieve 99.99% efficiency with less energy than incinerators. However, despite their high potential efficiency, SCR systems are only appropriate for some gaseous pollution reduction applications due to their high cost and inability to process emissions and exhaust-containing particulates.

Emission Control System

Biofilters

These filters use microorganisms to reduce and remove water-soluble chemicals in their air pollution management process. The microorganisms used include bacteria and fungi. Biofilters eliminate pollutants to lessen their presence in industrial emissions and exhaust, much like incineration systems do. The microorganisms in biofilters, however, take in and break down gaseous pollutants like VOCs and organic HAP without producing byproducts usually created during combustion, such as NOx and CO. Over 98% efficiency is achievable with these devices.

Biofiltration System

Chapter 4: Applications and Maintenance of Air Pollution Equipment

Applications of Air Pollution Control Equipment

Equipment used in industrial processes to control air pollution is essential and needs to be addressed. Any industry can be named, and it will become clear how much toxic material it releases into the environment due to its operations. The petroleum, oil, coal, metal, chemical, and waste management sectors are a few major companies that have contributed significantly to environmental pollution.

Industrial procedures – including sourcing raw materials, manufacturing the final product, maintaining the site and machinery, and transporting the product to different locations – result in some pollution. Volatile hydrocarbons are released when fossil fuels are burned. Carbon dioxide and sulfur dioxide are produced when wood and coal are used as fuel, and a significant amount of harmful carbon comes from automobiles. Every industrial process produces emissions that contaminate the air, the soil, or the water.

  1. Reducing the discharge of dangerous gasses and stopping the spread of air and water pollution are the objectives of industrial air pollution control equipment.
  2. Protect any remaining natural resources for future generations.
  3. Reduce pollution-related risks to health that can be inhaled or otherwise ingested.

Additionally, homes, cars, and other moving objects use non-industrial air pollution control technology. For instance, filtration technology in the home clears air conditioners of impurities like pet dander, allergies, mold spores, and dust.

In addition, precision filtration systems reduce vehicle emissions from engines, exhaust pipes, and air conditioning systems.

Maintenance of Air Pollution Control Equipment

  1. By doing routine tests all year long, you can prevent sudden shutdowns. Make a monthly schedule for testing the alarm system, intake valves, or control components. Manufacturers can assist in identifying faults before they impact output by ensuring the equipment is operating as planned. These tests can also guarantee the accuracy of the emission values used to meet EPA regulations.
  2. Unwanted debris and dirt can accumulate inside the unit over time, reducing how well the system functions. Manufacturers can prolong the life of the equipment by designating specific days for thorough equipment cleanings. Consistent checks ensure that equipment goes smoothly without being inspected, regardless of whether the equipment needs a thorough cleaning every time.
  3. In some circumstances, the machinery can need replacement components or the help of a professional in pollution control units. Adding a yearly or biannual visit with an expert can help manufacturers discover bigger concerns concealed from the untrained eye, even if the equipment appears to function well. In addition, manufacturers can save costs related to employee training on difficult repairs by using maintenance specialists.

Chapter 5: Air Pollution Prevention Tips

  1. Use public transport whenever possible. For example, a bus can carry about 40 to 50 people at a time, with only one to four in a car. Bus transit is better for the environment.
  2. Use smart air filtering technology. Pollution can also enter indoor spaces. Consider getting an indoor air pollution control system. These systems keep the home environment clean while ensuring safe living for the user and their loved ones.
  3. Use clever waste management strategies. People's bad behaviors are to blame for the increase in air pollution. As a result, it is important to dispose of waste responsibly and follow legal requirements.
  4. To prevent the release of toxic chemicals and other pollutants into the environment, industries should implement sound waste management strategies.
  5. Adopt eco-friendly habits. People and corporations should adhere to practices that have no negative effects on the environment.
  6. Create a maintenance schedule for the equipment that controls pollutants and follow it. For the greatest performance, industrial and domestic pollution control equipment must be serviced periodically.
  7. Avoid using products containing chemicals. Products with chemicals should be used sparingly or outside the house. Examples include paints and perfumes. Utilizing goods with low chemical content and organic qualities is another option.
  8. Last but not least, implement afforestation by planting and cultivating as many trees as possible. The act of planting trees improves the ecosystem greatly and aids in the release of oxygen.

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Table of Contents

What is Air Pollution Control Equipment?

History of Air Pollution Equipment

Types of Air Pollution Control Equipment

Applications and Maintenance of Air Pollution Equipment

Air Pollution Prevention Tips

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