Last data update: Sep 16, 2024. (Total: 47680 publications since 2009)
Records 1-4 (of 4 Records) |
Query Trace: Klima SS [original query] |
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A second case study of field test results for comparison of roof bolter dry collection system with wet collection system
Reed WR , Klima SS , Mazzella A , Ross G , Roberts G , Deluzio J . Min Metall Explor 2022 39 (3) 993-1006 Silicosis is an occupational respiratory disease that roof bolter operators are susceptible. It is caused by overexposure to respirable quartz dust (RCS) and has no cure and may ultimately be fatal. The only method of prevention of silicosis is by preventing exposure to RCS. The wet box collection system is a newly developed dust collection system for roof bolting machines, a modification of the existing dry box collection system utilizing water to saturate the material that is collected by the dust collection system. Testing was conducted for 3 days on a dual boom roof bolter with the wet box installed on the left side and the dry box installed on the right side. Sampling, using the coal mine dust personal sampling unit (CMDPSU), during cleaning of the collector boxes demonstrated that using the wet box dust collection system instead of the dry box dust collection system can reduce RCS exposures during cleaning of the collector boxes by 71% (day 1), 82% (day 2), and 88% (day 3). In addition, the quartz content of samples collected during cleaning of the wet box was 0.0%, while the quartz content of the samples collected when cleaning the dry box was 4.6%, 10.3%, and 7.4%. © 2022, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply. |
Field test of a canopy air curtain on a ramcar for dust control in an underground coal mine
Reed WR , Colinet JF , Klima SS , Mazzella A , Ross G , Workman M , Morson T , Driscoll J . Min Metall Explor 2022 39 (2) 251-261 The canopy air curtain (CAC) has been proven to reduce the respirable dust exposure of roof bolter operators in underground coal mining. This technology is being adapted for use with shuttle cars and ramcars. The plenum is mounted on the underside of the shuttle car canopy over the operator’s position. The blower providing filtered air to the operator is plumbed into the shuttle car’s existing hydraulic system. After the system was installed on a ramcar, field testing of the CAC’s ability to provide respirable dust control was conducted on a section using blowing face ventilation. Results showed that overall respirable dust reductions during the total time the operator was underneath the canopy ranged from 11 to 34%, demonstrating adequate performance. However, further analysis demonstrated that the CAC performance was exceptional when the ramcar was being loaded by the continuous miner. At this location, a position where the shuttle car operator has their highest potential for respirable dust exposure, the CAC provided dust reductions ranging from 57 to 65%. These results, especially during ramcar loading at the CM, demonstrate that the CAC can be an important dust control device to reduce shuttle car and ramcar operators’ exposure to respirable coal mine dust. © 2022, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply. |
A laboratory investigation of underside shield sprays to improve dust control of longwall water spray systems
Klima SS , Reed WR , Driscoll JS , Mazzella AL . Min Metall Explor 2020 38 (1) 593-602 Researchers at the National Institute for Occupational Safety and Health (NIOSH) performed laboratory testing to improve longwall dust control by examining the use of underside shield sprays in conjunction with the longwall directional spray system. In a field survey of longwall operations, NIOSH researchers observed dust clouds created by the fracturing and spalling of coal immediately upwind of the headgate drum that migrated into the walkway, exposing mining personnel to respirable coal dust. The goal of this research was to create an effective traveling water curtain to prevent this dust from reaching the personnel walkway by redirecting it toward the longwall face. The location, orientation, and pressure of the water sprays were the primary testing parameters examined for minimizing dust exposure in the walkway. Laboratory testing indicates that the use of underside shield sprays on the longwall face may be beneficial toward reducing respirable dust exposure for mining personnel. |
Empirical engineering models for airborne respirable dust capture from water sprays and wet scrubbers
Organiscak JA , Klima SS , Pollock DE . Min Eng 2018 70 (10) 50-57 Airborne respirable coal dust capture by water sprays or wet scrubbers has been studied and developed over many decades as an engineering control to reduce dust exposure in coal mines and combat coal worker pneumoconiosis. Empirical relationships and deterministic models for particular dust capture experiments have previously been devised to show the key parameters involved in airborne coal dust capture. Many of the results from these models show that the significant parameters related to airborne dust capture are water spray pressure, water quantity, water droplet size, relative water droplet-to-dust particle velocity, and total operating air pressure of the scrubber. However, many airborne dust capture efficiency relationships and models developed for particular experiments cannot be readily applied to forecast the dust collection efficiency of different spray and scrubber design configurations, which rely on several key dimensional engineering measures. This study examines engineering measures from previous water spray and wet scrubber experiments conducted by the U.S. National Institute for Occupational Safety and Health (NIOSH) and the U.S. Bureau of Mines (USBM) to develop empirical models for wet collection of airborne dusts. A dimensionless empirical model developed for predicting airborne dust capture efficiency of water sprays and wet scrubbers is presented. |
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