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Evaluation of techniques for protecting dust sampling equipment in harsh environments.

Goodman-GVR; Spencer-ER
Pittsburgh, PA: U.S. Department of Energy, Bureau of Mines, RI 9627, 1996 Jan; :1-15
A study was conducted to assess several techniques for protecting sensitive dust instrumentation in damp and unprotected environments. One of the methods tested involved connecting the sampling cyclones to real time aerosol monitors (RAM) or dust pumps using tygon tubing. This would permit sampling to be done in unprotected areas, yet protect the RAM or sampling pump from possible damage. A second method used small neoprene rubber shields to protect the inlets of the sampling cyclones from clogging when exposed to high dust and water mist levels. The findings indicated that tubing length significantly affected dust levels measured with the RAM. Gravimetric measurements were not significantly affected by the tubing. A slight decreased was noted in mass median diameter of the dust particles with the use of tubing. A corresponding shift was noted in particle sizes toward the smaller size fractions. This may explain the change in the RAM readings. Changes in particle sizes were, however, insufficient to change gravimetric results. No significant differences in dust levels were measured with the RAM and gravimetric samples when analyzing the cyclone shields involved testing with no water and high airflow, testing with water and high airflow, and finally testing with water and low airflow. The mass median diameters did not vary appreciably with the use of shielding around the cyclone inlet. It was determined also that the effects of shielding on particle size distributions varied with test configuration.
Coal-dust; Dust-control; Control-technology; Mining-equipment; Air-quality-monitoring; Sampling-methods; Environmental-factors; Underground-mining; Equipment-reliability
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Report of Investigations
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Pittsburgh, PA: U.S. Department of Energy, Bureau of Mines, RI 9627