Gas Balance

Gas Balance

 

the quantity of gas being generated in a mine shaft and the distribution of gassing either by sources or throughout the system of workings. A distinction is made among the gas balances for individual workings, cutting sections, and shafts or for the mine as a whole. Knowledge of the gas balance is a basic prerequisite for selecting gassing control methods, shaft ventilation systems, and the methods of working the mineral.

One of the methods for determining the gas balance is the gas survey. The gas balance of a shaft is determined mainly by natural conditions and the mining-engineering factors of the working. The gas balance according to methane sources is composed of gassing from the coal seam or seams being worked, from adjacent gas-bearing coal seams; and from enclosing (surrounding) rock. Methane-rich shafts can be divided into two groups according to the makeup of the gas balance: the first group includes shafts working a single seam; the second, shafts working a series of seams. For the first group, gassing in the face area of more than 75 percent (less than 25 percent in the worked-out area) of the total methane discharge in the cutting section is typical during the cutting of a seam with small losses. The distinguishing feature of the second group is that the gassing in the face area is 50-60 percent and less (40-50 percent and more in the worked-out area) of the total methane discharge within the cutting field.

References in periodicals archive ?
A major discovery in block 10, greater than 15 tcf, could alter the gas balance and associated geopolitics in the region.
Taking about Georgia's 2018 natural gas balance, where gas supplies from Russia to Georgia are not envisaged, Mammadov said that those volumes will be substituted by imports of natural gas from Azerbaijan.
Since 2009, US shale production has added the equivalent of two Qatars to the global gas balance.
Did you add new reserves to companies' oil or gas balance during the past period?
Ali-Reza Kameli, head of National Iranian Gas Exports Company, said the last calendar year, which started on March 21, was the first year Iran witnessed a positive gas balance, the oil ministry website reported
Hatem Nuseibeh, president of Total UAE and member of the Gas Arabia Advisory Board added: "Total have been following the gas balance in this region for a while, and we can see that there is a need to prepare for the future, to make sure that there is the supply that is needed to satisfy the growing demand in the region.
Also, he said, according to gas balance by 2030 its production will increase to 60 billion cubic meters, with the exception of the volume of gas required to maintain manufacturing activity.
One of the direct consequences is the noticeable differences in gas balance results at month's-end closing.
Over the past two decades, Total said, LNG has emerged as increasingly core feature of the global gas balance, with growth of about 7% a year since 2000.
This explains why the DECC sees shale gas as a longer-term prospect that's unlikely to make a contribution to the UK's gas balance until the 2020s.
If TEPCO's plan is implemented as it is, it will have a serious impact on the greenhouse gas balance.
The section on mechanical engineering and materials science presents work on areas such as prediction of gas balance schedules in a steel plant, impact assessment of job machine factors on scaling parameters, the application of a frequency converter driver in a long-belt conveyor, and the design of a crop remote-sensing monitoring system based on supermap objects.