The invention discloses a device for extracting
helium from
natural gas. The device comprises a frame, a
combustion module, an alkali liquor spraying module, a
molecular sieve drying module, a filtering module, a heat exchange module, a
refrigeration separation module and a magnetic suspension high-speed
centrifugal separation module, wherein the
combustion module, the alkali liquor spraying module, the
molecular sieve drying module and the filtering module are sequentially arranged from bottom to top; the
combustion module is connected with the alkali liquor spraying module; the alkali liquorspraying module is connected with the
molecular sieve drying module; the molecular
sieve drying module is connected with the filtering module; the filtering module is connected with the heat exchangemodule; the heat exchange module is connected with the
refrigeration separation module; and the
refrigeration separation module is connected with the magnetic suspension high-speed
centrifugal separation module. According to the method, only
helium and a small amount of
hydrogen are left in the
helium-containing
natural gas tail gas through the steps of combustion, spraying, drying, filtering, pre-cooling and condensation separation, and then the helium and the small amount of
hydrogen are introduced into the magnetic suspension high-speed
centrifugal separation device to be effectively separated, so
high energy consumption of a traditional cryogenic method is avoided, and helium extraction cost is greatly reduced.