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961.
962.
963.
Alan H. Dean Kenneth M. Cushing 《Journal of the Air & Waste Management Association (1995)》2013,63(1):90-96
Pulse-jet fabric filters rely on the filtration of dirty flue gas by the outside surface of the bags, which are then cleaned by a shock wave generated by an air pulse entering each bag from the top. As it travels down the length of the bag, the shock wave flexes the fabric and dislodges the dust cake. Enhancement of the pulse may be achieved by using a venturi, and cleaning may be on-line or off-line. This paper summarizes the results of an exhaustive study conducted for the Electric Power Research Institute to provide a convenient and versatile information base about the use of pulse-jet fabric filters on coal-fired boilers. Predominant features of the many pulse-jet installations identified by vendor survey and literature survey are shown in graphical and tabular form. 相似文献
964.
965.
Walter W. Kovalick Jr. James B. Cummings 《Journal of the Air & Waste Management Association (1995)》2013,63(3):347-349
The following is the first in a series of articles on various efforts to encourage and support innovation in hazardous waste treatment technologies for sites and affected groundwater. This article provides a brief discussion of the origins of the U.S. EPA’s Office of Solid Waste and Emergency Response (OSWER) Technology Innovation Office (T1O), its mission, and the major initiatives underway or under contemplation. Subsequent articles will provide progress reports on these initiatives and other activities related to technology innovation by federal and state regulators, technology developers, responsible parties, the engineering community, and other interested parties. 相似文献
966.
Kenneth M. Cushing Randy L. Merritt Ramsay L. Chang 《Journal of the Air & Waste Management Association (1995)》2013,63(7):1051-1058
Electric utilities have made significant progress in recent years in designing and operating baghouses for collection of coal fly ash. As a result, early concerns with high operating and maintenance requirements and short bag lives are no longer an issue. With increasingly stringent air emissions regulations and imminent revision of the Clean Air Act, baghouses have become an attractive particulate collection option for utilities. In order to keep its member utilities apprised of the latest design and operation and maintenance experience with baghouses, the Electric Power Research Institute has been conducting surveys of utility baghouse user experience. This paper presents results from the latest survey, conducted in 1989. A previous survey was conducted in 1985. The 1989 survey was conducted using questionnaires mailed to the utilities, telephone inquiries, and plant visits. This paper discusses the general trends observed in baghouse design, performance, operation and maintenance. 相似文献
967.
968.
Thomas D. Brown Dennis N. Smith Richard A. Hargis Jr. William J. O'Dowd 《Journal of the Air & Waste Management Association (1995)》2013,63(6):1-97
ABSTRACT Based on the available evidence of health effects, the U.S. Environmental Protection Agency (EPA) has been evaluating the need to regulate mercury releases to the environment. In response to the congressional mandates in The 1990 Clean Air Act Amendments (CAAA), the EPA has issued the Mercury Study Report and the Study of Hazardous Air Pollutant Emissions from Electric Utility Steam Generating Units Report. In spite of the enormous effort represented by these reports, as well as the efforts of both the U.S. Department of Energy (DOE) and the Electric Power Research Institute (EPRI), in conducting the field measurement programs that form the basis for these reports, a definitive answer on the need for mercury regulation has not been found. However, the EPA, as well as other regulatory agencies and health researchers, have suggested a "plausible link" between anthropogenic sources emitting mercury and the methylation, bioaccumulation in the food chain, and adverse health effects in humans and wildlife. 相似文献
969.
Elizabeth M. Howard Robert C. McCrillis Kenneth A. Krebs Roy Fortman Huei Chen Lao Zhishi Guo 《Journal of the Air & Waste Management Association (1995)》2013,63(10):924-930
ABSTRACT Conversion varnishes are two-component, acid-catalyzed varnishes that are commonly used to finish cabinets. They are valued for their water and stain resistance, as well as their appearance. They have been found, however, to contribute to indoor emissions of organic compounds. For this project, three commercially available conversion varnish systems were selected. A U.S. Environmental Protection Agency (EPA) Method 24 analysis was performed to determine total volatile content, and a sodium sulfite titration method was used to determine uncombined (free) formaldehyde content of the varnish components. The resin component was also analyzed by gas chromatography/mass spectroscopy (GC/MS) (EPA Method 311 with an MS detector) to identify individual organic compounds. Dynamic small chamber tests were then performed to identify and quantify emissions following application to coupons of typical kitchen cabinet wood substrates, during both curing and aging. Because conversion varnishes cure by chemical reaction, the compounds emitted during curing and aging are not necessarily the same as those in the formulation. Results of small chamber tests showed that the amount of formaldehyde emitted from these coatings was 2.3–8.1 times the amount of free formaldehyde applied in the coatings. A long-term test showed a formaldehyde emission rate of 0.17 mg/m2/hr after 115 days. 相似文献
970.
E.E. Rickman Jr. G.B. Howe R.K.M. Jayanty J. Kaye Whitfield 《Journal of the Air & Waste Management Association (1995)》2013,63(5):608-613
Abstract Consumer products are potentially significant sources of volatile organic compounds (VOCs), which are precursors to the formation of ozone in photochemical smog. To address the problem of ozone formation in ambient air, the U.S. Environmental Protection Agency (EPA) has been involved in the development of test methods for measuring the VOC content of consumer products. This paper describes results of an interlaboratory study to estimate the repeatability (precision of analyses performed by a single laboratory) and reproducibility (precision of analyses performed by different laboratories) of the consumer products’ VOC measurement method based on EPA Method 24 (for VOCs in surface coatings). The mean method repeatability was 2.7 wt % VOC, and the mean method reproducibility was 4.8 wt % VOC. Method repeatability ranged from 0.2 to 4.4 wt % VOC, and reproducibility ranged from 0.6 to 11.9 weight percent VOC. The precision of the VOC method for consumer products is similar to the precision of EPA Method 24 for surface coatings. 相似文献