Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link


Centers for Disease Control and Prevention. CDC twenty four seven. Saving Lives, Protecting People
Search
            ×
                        Mining
                        Mining
                            NIOSH
                            All CDC
                    Submit
                For a full list of topics:A-Z Index
                Advanced Search
            Advanced Search


The National Institute for Occupational Safety and Health (NIOSH)





Mining Publication: Modeling the Effect of Seal Leakage on Spontaneous Heating in a Longwall Gob Area
Keywords: Gobs Longwall panels Seals Ventilation
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: June 2010
Authors: AC Smith, L Yuan
Conference Paper - June 2010
Download PDF Document (0.20 MB)
NIOSHTIC2 Number: 20037506
Proceedings of the 13th U.S./North American Mine Ventilation Symposium, Sudbury, Ontario, Canada, June 13-16, 2010. Hardcastle S, McKinnon DL, eds., Sudbury, Ontario, Canada: MIRARCO - Mining Innovation, 2010; :479-484
Federal regulations provide that mines with a demonstrated history of spontaneous combustion or that are located in a coal seam determined to be susceptible to spontaneous combustion may use a bleederless ventilation system as a spontaneous combustion control measure. Currently, three coal mines in the U.S. are utilizing a bleederless system to prevent spontaneous combustion. In a bleederless ventilation system, one of the headgate entries is used as the tailgate entry of the succeeding panel and is isolated from the gob of the active panel by gob seals constructed in each crosscut inby the active face. Air is coursed across the face area and outby in the tailgate entry into a return entry instead of inby through the gob. As the longwall progresses, some seals may leak. When the headgate entry is ventilated, such as in a Y-type bleederless system, the air leakage through the seals into the gob may lead to spontaneous heating in the gob behind the seals. In this study, a computational fluid dynamics (CFD) model developed in our previous work is used to model the effect of seal leakage on spontaneous heating of coal in longwall gob behind the seal. A single longwall panel using a Y-type bleederless ventilation system was simulated. With typical bleederless ventilation conditions, the simulation results demonstrate that the effect of seal leakage on the spontaneous heating process depends on both seal leakage rate and gob permeability.
Image of publication Modeling the Effect of Seal Leakage on Spontaneous Heating in a Longwall Gob AreaConference Paper - June 2010
Download PDF Document (0.20 MB)
NIOSHTIC2 Number: 20037506
Proceedings of the 13th U.S./North American Mine Ventilation Symposium, Sudbury, Ontario, Canada, June 13-16, 2010. Hardcastle S, McKinnon DL, eds., Sudbury, Ontario, Canada: MIRARCO - Mining Innovation, 2010; :479-484
See Also
Determining the Source of Longwall Gob Gas: Lower Kittanning Coalbed, Cambria County, PA
Effects of Ventilation and Gob Characteristics on Spontaneous Heating in Longwall Gob Areas
Evaluating Ventilation Parameters of Three Coal Mine Gobs
Investigation of Longwall Face Ventilation Air-Splitting Methods for Improved Dust Control
Modeling the Effect of Barometric Pressure Changes on Spontaneous Heating in Bleederless Longwall Panels
Prediction of Porosity and Permeability of Caved Zone in Longwall Gobs
Simulation of Spontaneous Heating in Longwall Gob Area with a Bleederless Ventilation System
Strengthening Existing 20-psi Mine Ventilation Seals With Carbon Fiber-Reinforced Polymer Reinforcement
A Study of Leakage Rates Through Mine Seals in Underground Coal Mines
Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
Facebook
        Twitter
        LinkedIn
        Syndicate Mining
        Site BrowserSafety and Health TopicsData & StatisticsMethodologyMine DisastersMSHA Data FilesMine & Mineworker ChartsTools & PublicationsTools You Can UsePublicationsNews & ArticlesResearch ProgramNORA Mining CouncilStrategic PlanMining Program, 2019-2023Miner Health Program, 2020-2030ProjectsContractsFunding OpportunitiesMining LinksAbout UsContact NIOSH MiningEmploymentFacilitiesHistoryVisitor Information NIOSH Homepage
 NIOSH A-Z
Workplace Safety & Health Topics
Publications and Products
Programs


About CDC
					Contact Us
					800-232-4636
 Facebook Twitter Instagram LinkedIn Youtube Pinterest Snapchat
 CONTACT CDC
				Contact Us
							Call 800-232-4636
							Email Us
			ABOUT CDC
				About CDC
							Jobs
							Funding
			POLICIES
				Accessibility
							External Links
							Privacy
							Policies
							No Fear Act
							FOIA
							OIG
							Nondiscrimination
							Vulnerability Disclosure Policy
			CONNECT WITH US
				Facebook
								Twitter
								Instagram
								LinkedIn
							Youtube
								Pinterest
								Snapchat
								Email
			LANGUAGES
				Español
							繁體中文
							Tiếng Việt
							한국어
							Tagalog
							Русский
							العربية
							Kreyòl Ayisyen
							Français
							Polski
							Português
							Italiano
							Deutsch
							日本語
							فارسی
							English


U.S. Department of Health & Human Services
			Accessibility
			External Links
			Privacy
			Policies
			No Fear Act
			FOIA
			Nondiscrimination
			OIG
			Vulnerability Disclosure Policy
			USA.gov


Exit Notification / Disclaimer Policy Close
 Links with this icon  indicate that you are leaving the CDC website. The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website.
				Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
				You will be subject to the destination website's privacy policy when you follow the link.
				CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. Website Disclaimers
 Cancel Continue