کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
586068 1453269 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Design and development of a dust dispersion chamber to quantify the dispersibility of rock dust
ترجمه فارسی عنوان
طراحی و توسعه محفظه پراکندگی گرد و غبار برای اندازه گیری پراکندگی گرد و غبار سنگ
کلمات کلیدی
پراکندگی گرد و غبار؛ معدن؛ جلوگیری از انفجار؛ اندازه ذرات
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
چکیده انگلیسی


• Design and development of a dust dispersion chamber to quantify the relative dispersibility of rock dust.
• Measure the relative dispersibility of rock dust in terms of mass loss and the optical density variation.
• Evaluation of relative dispersibility of rock dusts with and without anti-caking agents.
• Evaluation of relative dispersibility of rock dust after exposing them to moisture.

Dispersible rock dust must be applied to the surfaces of entries in underground coal mines in order to inert the coal dust entrained or made airborne during an explosion and prevent propagating explosions. 30 CFR. 75.2 states that “… [rock dust particles] when wetted and dried will not cohere to form a cake which will not be dispersed into separate particles by a light blast of air …” However, a proper definition or quantification of “light blast of air” is not provided. The National Institute for Occupational Safety and Health (NIOSH) has, consequently, designed a dust dispersion chamber to conduct quantitative laboratory-scale dispersibility experiments as a screening tool for candidate rock dusts. A reproducible pulse of air is injected into the chamber and across a shallow tray of rock dust. The dust dispersed and carried downwind is monitored. The mass loss of the dust tray and the airborne dust measurements determine the relative dispersibility of the dust with respect to a Reference rock dust. This report describes the design and the methodology to evaluate the relative dispersibility of rock dusts with and without anti-caking agents. Further, the results of this study indicate that the dispersibility of rock dusts varies with particle size, type of anti-caking agent used, and with the untapped bulk density. Untreated rock dusts, when wetted and dried forming a cake that was much less dispersible than the reference rock dust used in supporting the 80% total incombustible content rule.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Loss Prevention in the Process Industries - Volume 39, January 2016, Pages 7–16
نویسندگان
, , , , ,