EPA Compliance Rules – Estimates 140 Portland Cement Plants Will Be Effected
Action: Final rule.
Summary: EPA is finalizing amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) from the Portland Cement Manufacturing Industry and to the New Source Performance Standards (NSPS) for Portland Cement Plants. The final amendments to the NESHAP add or revise, as applicable, emission limits for mercury, total hydrocarbons (THC), and particulate matter (PM) from new and existing kilns located at major and area sources, and for hydrochloric acid (HCl) from new and existing kilns located at major sources. The standards for new kilns concern facilities that commence construction, modification, or reconstruction after May 6, 2009. The final amendments to the NSPS add or revise, as pertinent, emission limits for PM, opacity, nitrogen oxides (NOX), and sulfur dioxide (SO2) for facilities that commence construction, modification, or. The final rule also includes additional testing and monitoring requirements for affected sources.
Dates: These final rules are effective on November 8, 2010.
Cement manufacturing plants are reliant on quarry mining operations, these operations provide limestone and clay to the plant processes. These materials are dried, pre-heated and undergo Calcinations and sintered into a cement clinker. To meet the terms of the aforementioned rule, air pollution control equipment may now be necessary in the cement process. Cement plants emit CO2 but may also emit acid gases, mercury, particulate, total hydrocarbons, and hazardous air pollutants (HAPs). All of these materials originate from the limestone, repeatedly these limestone formations contain Kerogen Hydrocarbons, Kerogen hydrocarbons occur naturally in many sedimentary rock formations, when these rock.
Purchasing the Correct Emission Control Equipment
Most public anxieties have been directed toward visible emissions, noise and odor. Often cement plant emissions may possibly be viewable from plant exhaust system, principally from the particulate and sulfurous amalgam. Many times plants have installed fabric filters and bag houses to take away the visible emissions. Frequently a dry injection scrubber has been used to further reduce emissions and volatile materials contained in the waste exhaust stream. To diminish volatile organic compounds and sulfurous emissions, many facilities have installed control devices which may include acid scrubbers, hot waste ceramic filters and, in a few instances a regenerative thermal oxidizer. The purpose of the Regenerative Thermal Oxidizer is to further remove any remaining carbon monoxide and total hydrocarbons. Regenerative Thermal Oxidizers have been in operation for more than 25 years. Later generations of Regenerative Thermal Oxidizers provide a cost effective and dependable control method for reducing emissions in cement plants. Regenerative Thermal Oxidizers have a proven reduction of 98% in total hydrocarbon emissions; this 98% destruction rate efficiency is considered acceptable and is well received by state and federal regulators. There are many advantages of operating a Regenerative Thermal Oxidizer when compared to other air pollution control devices. Regenerative Thermal Oxidizers are considerably more tolerant while maintaining a very high level of destruction efficiency. Regenerative Thermal Oxidizers operate on many different levels of total hydrocarbons. One of the most important aspects within the cement industry is the ability to function on the many variants in the rock material composition. Many other types of air pollution control systems are often designed to accommodate a single hydrocarbon type. The total hydrocarbon levels will vary with the process rock material. Regenerative Thermal Oxidizers have demonstrated to operate well with changing types of total hydrocarbon concentrations.
Process Development for the Regenerative Thermal Oxidizer
Regenerative Thermal Oxidizers are best designed to operate after any initial particulate bag house system and preceding any acid gas scrubber and/or secondary particulate filter system. If Halogens are present in the waste stream dry injection scrubbers should be utilized after the Regenerative Thermal Oxidizer and may be positioned on the exhaust side of the regenerative thermal oxidizer system. Dry acid scrubbers will defend the exhausts carbon steel from any corrosion caused by the acid gas. Sending acid gas to the Regenerative Thermal Oxidizer will require much higher construction costs. These costs may possibly include such materials such as Inconel, 316L and or A20.
Process
When a Regenerative Thermal Oxidizer has been selected in emission control, some substantial issues should be evaluated such as the size of the area needed with real estate becoming very costly a small compact or modular designed Regenerative Thermal Oxidizer will allow plant flexibility and becomes a more favorable solution. Regenerative Thermal Oxidizer scope of supply must consist of optimizing the ceramic heat recovery media. There are many types of ceramic media available, but only a few are proven to be durable enough in cement plant Regenerative Thermal Oxidizer. One such structured ceramic material (block) is designed to be highly compact and non-porous and has proven to be very effective against particulate build up. Ceramic saddles should not be used and have proven in the past to become impacted or plugged frequently; such impaction will reduce the plant process flow. A correctly implemented wash down will prove its value in this application. Any cement dust which may have went through a filter system combines with high levels of relative humidity in the process stream and may require the Regenerative Thermal Oxidizers structured ceramic media to receive periodic wash down. These wash downs consist of a worker using a high volume water hose at predetermined times. The periodic wash downs will assure continuous regenerative thermal oxidizer operation. The need to keep ceramic media free of large particulate is crucial for the regenerative thermal oxidizer system to maintain process volumes and environmental compliance.
Newly adopted environmental compliance makes add on equipment a necessity for plant additions for cement plants around the country. Many cement plants have begun installing upgrades to their emission control systems. The use of a Regenerative Thermal Oxidizer is the logical choice for total hydrocarbon emissions and is found to be BACT qualified. For more information about Air Pollution Control Equipment please visit: American Environmental Fabrication & Supply, LLC or Call +1 918 708-1253.
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