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abstract
锛?/p>
most
of
our
coal
mines
belong
to
high-gas
coal
mine.
gas
exceeded
is
one
of
the
security
risks
for
mine
safety
production. the mine ventilation system undertakes the
important
task
of
discharging
toxic
gases
and
supplying
fresh
air
from
the
underground.
most
of
ventilation
systems
of
mine
are the
products
of
the
last century
锛?/p>
so
they
are
generally
older and have various shortcomings
锛?/p>
especially they need
down machine and the time is too long
锛?/p>
which results not
enough ventilation capacity in a short period and the
instantaneous agglomeration of the gas in the bottom of the