Air pollution control equipment removes and eliminates a wide variety of pollutants, known as volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) including sulfuric fumes, gases, odors and vapors from the atmosphere. VOCs and HAPs cause serious environmental and biological damage resulting in smog, acid rain, carbon emissions and global warming, but they are reduced or eliminated by air pollution control equipment.
To remain in compliance with federal emissions regulations, facilities must install emission control systems to keep air pollution output below levels specific to facility size and pollutant type. Oxidizers perform a process in which air pollutants such as hydrogen sulfide are broken up and reformed into safe, non-toxic carbon; this process, called oxidation, is performed by burning air pollutants and is at the heart of most of these systems. Depending on the type of air pollution being controlled, facilities may also use wet scrubbers or dry air scrubbers, mist collectors, electrostatic precipitators, odor control systems or simply air filtration systems. Automotive, agricultural, petrochemical processing, mining, pharmaceutical and most industrial manufacturing facilities require air pollution control systems to regulate air purity inside the facility and without. To recuperate the some of the cost of running this equipment, many manufacturers use heat recovery systems as well.
Oxidizers may be thermal or catalytic, using either high heat or elemental additives to catalyze oxidation, or burning of VOCs (which is one common method of VOC abatement). Catalytic oxidizers typically wash polluted air in platinum or palladium, causing oxygen to separate from VOCs and create non-toxic bi-products such as nitrogen and oxygen, as opposed to nitric oxide. Both catalytic and thermal oxidizers may be regenerative or recuperative. Recuperative oxidizers use ceramic heat transfer beds to recover as much energy as possible from the oxidization process -- often as much as 90% to 95%. These heat transfer beds act as heat exchangers, coupled to a retention chamber where the organics are oxidized. Regenerative thermal oxidizers recover up to 90-95% of the heat energy released from oxidation processes with ceramic heat transfer beds. Recuperative oxidizers use a plate, shell, tube or other conventional type of heat exchanger to preheat VOC-contaminated process gas in an energy recovery chamber. A catalyst - either heat or elemental additives - oxidizes the VOCs, which then release enough energy to allow self-sustained operation.
Non-oxidizing air pollution control equipment uses a variety of filtering methods to separate volatile organic and inorganic compounds from processed air. Air scrubbers may be dry scrubbers or wet scrubbers; dry scrubbers remove acid gases such as sulfuric oxide and hydrogen chloride using dry sorbent alkaline materials, while wet scrubbers clean flue gas of larger pollutants and dust using water or other liquid reagents. Electrostatic precipitators clean pollutants and dust particles from polluted air using electrical ionizing fields and tightly woven fabric filters to remove particulate from boiler flue gas and other process air. Electrostatic precipitators often filter process smoke, mist or other large liquid or solid particle contaminants in a process called mist collection. Mist collectors and oxidizers are often used as odor control systems for high methane producing facilities such as pulp and paper or livestock processing. Nitrogen oxide controls include the processes of selective catalytic reduction, which controls emissions of nitrogen oxides from stationary sources, and selective non-catalytic reduction, which changes oxides of nitrogen (NOx) into molecular nitrogen (N2). If VOCs have recovery value, carbon adsorption, scrubbing and condensation are typical techniques may recuperate materials. Thermal and catalytic oxidation and biofiltration are common VOC controls utilized when the VOC stream has no recovery value.
The Environmental Protection Agency has stipulated federal regulations regarding industrial facility air pollution emissions which limit the type and quantity of Volatile Organic Compounds and Hazardous Air Pollutants industrial manufacturing facilities may emit during processing. VOCs and HAPs pose threats not only to the safety of the environment and local ecosystems, but to human health as well. 188 HAPs have been regulated which are suspected or proven to cause cancer, birth defects and other serious health effects. Based on the federal regulations laid down in the Clean Air Act, the National Ambient Air Quality Standards (NAAQS) is a set of emissions standards based on scientific studies spanning several years designed to protect the health and safety of the environment and public. Most of these standards are recent, having been implemented only within the last ten to twenty years. Facilities may use data-providing Continuous Emissions Monitoring Systems (CEMS) to aid in the control, monitoring and reporting of pollutant emissions. VOC and HAP emissions have significantly decreased as a result of these strict regulations, but the emission of carbon, a non-volatile organic compound, is becoming of greater concern to environmentalists, lobbyists, state and federal legislators in recent years due to global climate change. Recent and proposed state and federal emissions regulations are beginning to concentrate on lowering carbon emissions further, a regulation which may require manufacturers to seek alternatives to oxidizers and incinerators.
Air Pollution Equipment - Perceptive Industries, Inc.
Air Pollution Equipment - Perceptive Industries, Inc.
Air Pollution Equipment - Epcon Industrial Systems
Air Pollution Equipment - Air-Clear, LLC
Air Pollution Equipment - Air-Clear, LLC
Air Pollution Equipment - Air-Clear, LLC
The majority of the scientific community agrees that climate change is happening and that it is a human-caused phenomenon. Studies have estimated that the average temperature of the Earth has risen by about 0.8 degree Celsius since the Industrial Revolution. To an untrained mind, it may seem like a miniscule change; however, this increase in temperature is attributed to serious catastrophic events, such as recurrent droughts, devastating hurricanes like Katrina, and escalated melting rate of glaciers.
Citing these studies, the federal and state governments have passed several standards aimed at regulating emissions from a range of sources, such as coal-based electricity producers, vehicles; large or small, and industries.
Air pollution control equipment
Equipment for air pollution control removes and eliminates a wide variety of pollutants, known as volatile organic compounds (VOCs) and hazardous air pollutants (HAPs), including sulfuric fumes, gases, odors and vapors from the atmosphere. VOCs and HAPs cause serious environmental and biological damage, resulting in smog, acid rain, carbon emissions and global warming, but they can bereduced or eliminated by using air-pollution control equipment. Among all government mandated emission control systems, the two main types of equipment that are used most frequently are: carbon absorbers and oxidizers.
Oxidizers can be of two types -
Thermal oxidizers use heat to convert contaminated air into clean air. The same functioning principle is applied in thermal recuperative oxidizers, afterburners, rotor concentrator systems, regenerative catalytic oxidizers, and regenerative thermal oxidizers, with varying degree of modifications for better results. Emissions are pulled into the machine, where high heat induces a chemical reaction between the pollutants and a metal catalyst bed resulting in the removal of chemicals and contaminants.
It typically washes polluted air in platinum or palladium, causing oxygen to separate from VOCs and create non-toxic bi-products, such as nitrogen and oxygen, as opposed to nitric oxide.
Both catalytic and thermal oxidizers may be regenerative or recuperative. Recuperative oxidizers use ceramic heat transfer beds to recover as much energy as possible from the oxidization process -- often as much as 90% to 95%. These heat transfer beds act as heat exchangers, coupled to a retention chamber where the organics are oxidized. Regenerative thermal oxidizers recover up to 90-95% of the heat energy released from oxidation processes with ceramic heat transfer beds.
In a carbon absorber, also known as air pollution scrubbers, contaminated process steam flows over an activated carbon bed, which removes the volatile organic compounds from the steam, and absorbs them, and then releases the contaminant free air. The absorbers make use of various chemicals and technologies, including:
Since carbon absorbers are expensive in terms of installation and operation, the technology has only been lightly implemented; however, soon they all will be mandatoryunder new regulations.
The pollution control equipment is primarily employed for regulating industrial emissions, so that the good ambient air quality can be achieved. The present day air-pollution control equipment primarily filter out many contaminants, including fine particulate matter, sulfur dioxide, carbon monoxide and dioxide, lead and oxides of nitrogen. Moreover, many measure and devices selectively filter out volatile organic compounds.
The most common pollution control equipment:
Precipitators specifically are used to remove particulate matter from exhaust airstreams. When an airstream is exposed to electrostatic precipitator, it endows electric charge to the particles presented in the airstream, and then removes them by the electric field. Precipitation unit has many parts, which range from discharge and collection electrodes, to baffles to distribute airflow, to collection hoppers and a dust clean-out system. They have high efficiency that can exceed 99 percent, and can remove small particulates up to 1 micrometer. They are typically used for controlling fly ash at fossil-fuel furnaces.
To remove particulates, cyclones uses spiral path to create cyclonic motion in the airstream in the chamber. As the gas swirls, within the chamber, the larger particulates move outward against the chamber wall, under inertia. Once they get in contact of the wall, they slow down and slide down, along the wall in a dust hopper. Then the clean air leaves through an outlet, which is situated at the top. The hopper that collects the particles is then cleaned. They have an efficiencies of 90 percent, and can catch particulates of size about 20 micrometres. However, the present environmental regulations are stricter, and cyclones quite cannot meet those standards. Therefore, they are only use d as pre-cleaners.
Air Pollution Scrubbers catch suspended particles by absorption, as an incoming airstream is exposed to a spray of water, or other solvents, which vary based on the application. Several types of scrubbers are available, including spray-tower, orifice scrubber and venture. All, more or less, use the same phenomenon to clean the exhaust air stream, only difference is the path of air stream, when it enters the chamber, and how it is manipulated to achieve better efficiency. Venturi scrubbers are the most effective design, which can attain efficiency up to 98 percent.
They are the most efficient devices, when it comes to removal of particulates. It consists of fabric-filter bags, which have a multitude of narrow and long bags suspended in a large enclosure. As the air with dust ascends to the bottom of the enclosure, assisted by fans, the particulates in the air get entrapped in the air filters, and the clean leaves the system at the top. They have unparallel efficiency going up to 100 percent, when particulates are large as 1 µm, however, as the size of the particulates goes down, the efficiency to comes down a bit. They are expensive to use, as maintenance and the operation cost are high. They are used with cooling coils that brings down the temperature of the air stream.
Pure and clean air is essential for sound health and proper wellbeing. However, pollution of the air has increased to such an alarming level in most towns and cities that it requires coordinated and comprehensive efforts from the government, industries, private institutions, and the public to reduce the current level and improve air quality.
With a plethora of air pollution control equipment available in the market, what simply requires is the will and commitment to adopting them to check the air pollution. When it comes to investing in air pollution control equipment, you need to consider some of the essential factors to make the most of your purchase-
Installation of high quality air pollution control equipment is essential in order to reduce air pollution and improve air quality. Based on the nature of your business and the amount of pollutants you are releasing into the air, you can select the most suitable equipment and purchase it from a leading supplier.
Selecting a professional supplier of air filters, dust collectors or other pollution control equipment is crucial to getting the excellent equipment at a competitive price. You can check online directories to find out a leading supplier of such equipment.
Before finalizing the supplier, you must check the site, their products list as well as clients' testimonials to get a fair idea of the competence and professionalism of the company.
Whether you have to purchase a wet scrubber or mist collector, you must check the features of the equipment to ensure that it suits your requirement and your pocket. Besides this, you can also check the quality of installation, repair, and maintenance services as provided by the supplier. This will ensure that you get quality after-sales services.
You can check the price quote of the desired pollution control equipment on different sites to get the best value for money. However, you should not compromise with the quality of the equipment, as an inferior quality product would not serve your purpose and would lead to wastage of your time and money. Additionally, low quality products tend to be inefficient and non-durable, which will defeat the purpose of installing them in the first place.
Besides purchasing quality equipment, it is important to get it installed properly by experts and get comprehensive maintenance to ensure long lasting service. A reputed supplier will, more likely than not, ensure that expert technicians install the equipment. However, do not forget to negotiate a maintenance contract for your equipment.
Given the current precarious state of the environment, it is high time everybody do something in his or her unique way to reduce pollution. If you are a manufacture or a factory owner, you can contribute by using techs that help curb industrial emissions.
Last month, the U.S. Energy Information Administration (EIA) published a report that showed carbon dioxide (CO2) emission, generated by electricity, has gone down by 21 percent in 2015 from the 2005 level.
Steps taken to regulate the emission of greenhouse gases by the federal government are coming to fruition. According to the EIA, the decrease has been drastic because of the adaption of cleaner fuel sources. When you examine the country's electricity generation mix you can see a clear shift to renewable and natural gas-fired electricity generation.
The same shift is also seen in air pollution control equipment landscape, the new generation emission control systems are effectively removing sulfur dioxide (SO2) and oxides of nitrogen (NOx) emissions, and particulate emitted by incineration, power, and chemical plants.
Increase in demand
The need to comply with the EPA's Mercury and Air Toxics Standards (MATS) rule has driven the demand of new emission control systems; there is a growth of 6.47 percent in the demand of new equipment. Many coal-based electricity generation facilities are embracing these systems; the latest addition to the list is the Lon D. Wright Power Plant in Freemont, Nebraska. The plant has upgraded its air quality control system (AQCS), adding pulse jet fabric filter as well as an activated carbon injection system and a spray dryer absorber.
New generation equipment
Regenerative Thermal Oxidizer (RTO)
The RTO is the most efficient and cost saving system these days. As RTO reuses around 97% of the thermal energy and has a Hot Gas Bypass, it is widely used in the industry in challenging conditions, like emission spikes. It also can handle higher concentrations of exhaust gases unlike conventional oxidizer. Moreover, it does not have catalyst in the design, which saves significant capital in maintenance and replacement parts.
Rotary Concentrator System
Rotary Concentrator System is a hybrid air pollution control system, designed especially to efficiently destroy and remove pollutants from exhaust air stream. However, its application is limited to exhaust air steams. It removes air pollutant with the use of a hydrophobic zeolite rotating wheel.
Secondary recovery units
There are a number of secondary recovery units available that can be fitted in the existing oxidizer system or in a newer system, giving a greater degree of efficiency. Secondary recovery units can be used effectively to capture the 250 degrees to 1,500 degrees Fahrenheit of heat energy, which otherwise would have been vented out to the atmosphere. They can be designed optimally for minimal pressure drop without affecting the operation.
Similarly, more efficient air filtration systems and air pollution scrubbers are available on the market that provide good return on investment while savings substantial capital for industries.
Air Pollution Equipment Terms- The attachment of concentrated liquid or gaseous molecules to a solid or liquid surface. Unlike absorption, the substances, such as active carbon and silica gel, do not permeate one another.