Location

Rolla, MO

Session Start Date

6-11-1999

Session End Date

6-17-1999

Keywords and Phrases

Methane; Continuous Miners; Roadheaders; Burnt Coal; Gas Contents

Abstract

An intensive research programme has quantified the methane conditions around mechanical miners in production conditions. Methane seam gas contents show an increase of up to 26 times when mining burnt coal compared with normal increase in emission rates. Coal seam methane contents at the face increased from 1 m3/t to 6m3/t in one section, and from 0.1 m3/t to 2.6 m3/t in another. Emission rates from burnt coal were as high as 300 lit/min as it was mined. These increases in content and emission occur immediately after cutting into the burnt coal. Methane concentrations of 3% were recorded behind the cutting drum of a continuous miner working in burnt coal, with other peak concentrations of 2.5% and 2.7%. Concentrations above the legislated 1.4% were maintained for 52 percent of actual coal cutting time, and above 2% methane for 23 percent of cutting time. Highest methane was generally detected on the return side of the continuous miners, but did also cover the entire front area, at least to the back of the cutting drum. Methane sensors positioned in the operator's cab were ineffective in detecting the high methane concentrations close to the face.

Department(s)

Mining and Nuclear Engineering

Appears In

U.S. Mine Ventilation Symposium

Meeting Name

8th U.S. Mine Ventilation Symposium

Publisher

University of Missouri--Rolla

Publication Date

6-11-1999

Document Version

Final Version

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

 
COinS
 
Jun 11th, 12:00 AM Jun 17th, 12:00 AM

Increased Methane Emissions for Mechanical Miners Working in Burnt Coal

Rolla, MO

An intensive research programme has quantified the methane conditions around mechanical miners in production conditions. Methane seam gas contents show an increase of up to 26 times when mining burnt coal compared with normal increase in emission rates. Coal seam methane contents at the face increased from 1 m3/t to 6m3/t in one section, and from 0.1 m3/t to 2.6 m3/t in another. Emission rates from burnt coal were as high as 300 lit/min as it was mined. These increases in content and emission occur immediately after cutting into the burnt coal. Methane concentrations of 3% were recorded behind the cutting drum of a continuous miner working in burnt coal, with other peak concentrations of 2.5% and 2.7%. Concentrations above the legislated 1.4% were maintained for 52 percent of actual coal cutting time, and above 2% methane for 23 percent of cutting time. Highest methane was generally detected on the return side of the continuous miners, but did also cover the entire front area, at least to the back of the cutting drum. Methane sensors positioned in the operator's cab were ineffective in detecting the high methane concentrations close to the face.