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A continuous emission monitor for quantitative measurement of PM10 emissions from stationary sources
Abstract
A continuous emission monitoring system has been developed for accurate measurement of PM₁₀ dust mass concentration in a stack environment. Using an EPA Method 201A cyclone, the system continuously extracts a particulate sample from a stack environment at a flow rate of 14 L/min (0.5 ft³/min). The sample is then transported to a commercially available beta attenuation monitor for particulate mass measurement. Real-time mass data are recorded using a computer interfaced with the beta attenuation monitor, allowing for real-time computation of dust mass concentration in the stack environment. The device was installed at the main stack of Kennecott Utah Copper, a copper mining and smelting facility located ten miles west of Salt Lake City, UT. The system has been continuous operation since May 1999. A transpirated porous tube is utilized to transport the aerosol from the stack environment to the beta attenuation monitor, a horizontal distance of two meters. Clean sheath air is forced through the wall of the porous tube having an inner diameter of 19 mm (0.75 inches) at a rate of 28 L/min (1 ft³/min). The sheath air confines the aerosol to the core of the tube, counteracting sedimentation. Field tests were conducted to compare mass concentration measurements from the CEM system with those from EPA Method 201A. Calibration of the beta gauge revealed the device to be sensitive to dust samples having high atomic number elements, necessitating an ad hoc adjustment to the calibration of the beta gauge based upon the composition of dust sampled. When the beta gauge measurements were properly calibrated to the composition of the dust sampled, 1:1 correspondence between the time-averaged CEM system measurement and the EPA Method 201A measurement was observed over a range of stack concentrations from 2.5 to 58.3 mg/m³. The coefficient of determination (R²) for the 1:1 correlation was 0.95 for thirty comparison tests. The high atomic number dust encountered at the Kennecott Copper facility is not considered typical for stationary sources, suggesting that a specialized beta gauge calibration may not be required for other particulate emission monitoring situations.
Description
Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.Includes bibliographical references (leaves 138-142).
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Citation
Haglund,John Steven (2000). A continuous emission monitor for quantitative measurement of PM10 emissions from stationary sources. Master's thesis, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /ETD -TAMU -2000 -THESIS -H343.
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