The last decade has brought tremendous improvement in process chemistry, a better understanding of materials, simplified designs, and other technological enhancements. The much higher scrubber reliability has been attained by simplifying process configurations, understanding process chemistry better, selecting better materials, using redundant equipment in critical areas, applying practical utility construction experience in power plant operation.
The flue gas desulfurization systems, commonly known as scrubbers, are a highly efficient and reliable means of removing SO₂ as well as particulate matter, hydrochloric acid, and other air toxins. Scrubbers are the standard technique by which new technologies are judged.
Early scrubber systems were largely fairly unreliable with availabilities as low as 85 percent in the United States before 1980. Wet scrubbers and their components suffered from plugging and sealing, and material failures were frequently responsible for unplanned outages. Nowadays wet air scrubbers and other types of scrubbers are operating at more than 250 U.S. power plants with a total electric generating capacity of approximately 80,000 MW. This amounts to close to 24 percent of the total U.S. coal-fired capacity.
Scrubbers are very efficient air pollution control devices and can remove more than 95 percent of the SO₂ from power plant stack emissions. Scrubbers trap from tens to hundreds of tons of SO₂ per day at individual power plants, and over-control SO₂ emissions, thereby generating marketable emission allowances. Such high efficiency of wet scrubbers is achieved using developed additives such as dibasic acid, formic acid, and magnesium compounds that improve SO₂ removal efficiencies, especially for high-sulfur coal. Organic buffering agents, for example, allow removal efficiencies of 97 percent or more. Such high efficiencies allow utilities burning high sulfur coals to reduce SO₂ emissions to levels well below the limits set by federal regulations. Additionally, scrubbers are capable of removing significant quantities of particulate matter and chloric gas. Independent experts here concluded that retrofitted SO₂ scrubbers can remove a high percentage of particulate matter from flue gas. In addition, wet scrubbers can remove all the hydrochloric acid (HCl) from stack emissions.
In addition to this, numerous studies show that wet air scrubbers are often one of the cheapest SO₂ control options to install and operate, in either new or retrofit high-sulfur coal applications. Technological advances, increased experience, and flexible regulations have contributed to significant declines in the capital and operating costs of wet scrubbers relative to historic values. Also, it should be noted, advances in design and technology have greatly improved a given scrubbers energy efficiency.
Wet air scrubbers used to be routinely dismissed as simply turning an air pollution control problem into a solid waste problem because of the sludge they produce. However, wet scrubbers, according to the EPA, are highly efficient and, as a result, produce less waste than many alternative technologies.
In the last decades, numerous technical enhancements to scrubbers have occurred in such areas as reliability, cost, waste prevention, and energy consumption. The air pollution control business is highly competitive. To compete in the present business and regulatory eliminate, scrubber systems must reflect the latest cost-effectiveness enhancements.
Wet scrubbers are an effective air pollution control devices. To effectively work, many variables are considered when designing. Most commonly, a wet scrubber consists of a vessel, ductwork, fan, mist eliminator, pumps, and the liquid treatment.
Being a new type of wet air scrubber, multi-vortex wet air scrubber provides improved air treatment quality and can be used for both particles matter and gas collection. The treatment quality of multi-vortex wet air scrubber is generally 99.95-99.99% for both types of pollutants. Besides high efficiency, multi-vortex wet air scrubber possesses a number of advantages over conventional wet scrubbers – multi-vortex wet air scrubber is compact, omnivorous, eco-friendly, economical, and low-maintenance.
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