Institut za rudarstvo i metalurgiju Bor

• method without underground rooms,
based on drilling the drilholes from
surface through layers and bringing
gasification, enforcement gasification
agent through wells, or channel, and
removing product gasification through
production well;
• methods of underground rooms where
the layer, remaining after the completion
of the security pillars, gasification
made using the premises.
The first group of methods (wells
UCG) is mainly for current use the offbalance
reserves of coal gasification and
other outstanding security pillars and remnants
exploited balance reserves, after finishing
underground exploitation. Since
wells methods are usually applied in: filtering,
channel and flow method.
The aim of the UCG is to extract thermal
energy from coal, as fuel gas or synthesis gas
production. The process of transformation of
energy takes place through the complete and
incomplete combustion of coal and water-
Figure 2. Simplified UCG process scheme
The mostly widespread is the filtering
method, after the previous inflammatory
reaction zone. The American experiment is
the applied channel method, but, to channel
inflame with filtering method.
Underground gasification of coal,
characterized by the efficiency of exploited
coal, which represents the ratio of
gasified coal to the total amount of coal
input of the UCG. Thermal efficiency of
the process is defined by the relation of
thermal power obtained by heating a mixture
gas of coal power, which made a mixture,
reduced to the equivalent size, depending
on the type of gasified agent, its
pressure, and temperature, and properties
of coal gasification, layer depth, humidity
of coal, and tectonic conditions in the reservoir.
gas processing burning fiery coke at the site
of coal slope, by air, oxygen, steam, or their
mixture. UCG technological process consists
of preparing for the gasification of coal layer
and the process of gasification.
No 1, 2010. 53
MINING ENGINEERING