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Energy Conservation Opportunities
Published in Kaushik Bhattacharjee, Industrial Energy Management Strategies: Creating a Culture of Continuous Improvement, 2020
This plant has installed several MUA units, exhaust fans, and about nine dust collection systems. The dust collection system picks up dust from the extruders (workstations) and transports the dust to the filters, where it is separated from the air.
Evaluation of a self-cleaning portable dust collector for reducing worker exposures to silica at hydraulic-fracturing sites
Published in Journal of the Air & Waste Management Association, 2023
Grant King, Arthur Miller, Carl Schneider, Greg Feagan, Darby Gain
Currently, there are limited commercially available engineering controls for the collection of dust emitted from thief hatches on sand movers that can be deployed to retrofit the many sand movers that are still in service (Esswein et al. 2019). NIOSH is therefore conducting research with the aim of developing a solution to mitigate dust generated during the loading of sand movers. The focus is on developing a portable dust-collection system that can be retrofitted onto the thief hatches to eliminate such exposures. Previous NIOSH research evaluated a NIOSH-developed mini baghouse retrofit assembly as a potential engineering control and showed that this approach reduced worker exposure to RCS at a work site (Alexander et al. 2018). The current research focused on addressing refinements suggested by that earlier NIOSH work, including improving robustness, weather resistance, and developing an effective filter cleaning system. The goal is to develop a dust-collection system for retrofitting onto sand movers that is simple to install, self-cleaning, and requires minimal maintenance. To that end, the study focused on designing and fabricating a self-cleaning dust-collection system and performing laboratory testing to determine the efficacy of the system.
Experimental study on effects of drilling parameters on respirable dust production during roof bolting operations
Published in Journal of Occupational and Environmental Hygiene, 2018
Hua Jiang, Yi Luo, Joe McQuerrey
In order to understandTable 1, Table 2Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7 how drilling parameters will impact the generation of dust and the size distribution of the dust, drilling tests were conducted in a laboratory setting. The test setup is shown in Figure 2 and the dust collection system used on this test-drilling machine is the same as those equipped on underground roof bolter machinery. The dust collection system was cleaned before conducting experiment. After drilling each hole, the particles from the precleaner were discharged directly to a container. A new dust-bag was used for drilling each hole and the used bag was collected for measuring the dust weight and analyzing dust size distribution. Dust samples from the cyclone and filter inside the dust box were also collected separately and analyzed after completing each bolt-hole.
The mechanics of bolt drilling and theoretical analysis of drilling parameter effects on respirable dust generation
Published in Journal of Occupational and Environmental Hygiene, 2018
To test the validity of the mechanical model, drilling tests were conducted in a laboratory setting. The test setup is shown in Figure 7 and is equipped with drilling control, data acquisition, and dust collection system. The drilling control system acquires a pre-set R and v for each drilling which then automatically operates the drill to achieve the pre-set parameters and the real-time W and T can be recorded by the data acquisition system. The dust collection system used on this platform is the same as those equipped on underground roof bolter machinery. It is composed of a vacuum fan, an initial cyclone and followed by three subsequent dust collection steps in a dust chamber, which are a dust bag, a secondary cyclone, and a final filter. A detailed description of this system can be found in Jiang’s previous publication.[12] The vacuum fan draws the drill cuttings from the drill hole through the drill bit and hollow drill into the dust collection system during the whole drilling process. The initial cyclone collects approximately 81.4% of the total drill cuttings and more than 96% of the particles larger than 100 μm in the drill cuttings were deposited in this unit. While the remaining, finer dust proceeds to the dust chamber, then deposits in different filtration units, and cleaned airstream is exhausted into the environment with a total system cleaning efficiency over 99.9%.[13] This dust collection system assures the respirable fraction and larger (1–100 μm) particles were fully captured by the system. After each drilling, the particles in the collection system can be collected separately for further assessments.