초록 ▼

Solid material which is carried out of a fluidized bed reactor with the gas discharged therefrom and which is separated off in a separator is returned to the reactor by way of a recycling means. To reduce problems caused by virtue of differing pressure levels within the system in the recycling opera

Solid material which is carried out of a fluidized bed reactor with the gas discharged therefrom and which is separated off in a separator is returned to the reactor by way of a recycling means. To reduce problems caused by virtue of differing pressure levels within the system in the recycling operation, the pressure in the recycling means between the separator and the upper boundary of a bed of solid material which is formed in the recycling means is reduced by suction removal of gas to a pressure level which is no higher than or even lower than the lowest pressure in the separator which in turn is lower than the pressure in the reactor.

대표청구항 ▼

A process for the treatment of granular solid material in an apparatus including: a fluidized bed reactor having an upper portion and a lower portion, a means for introducing a granular solid material into said reactor and a means for introducing at least one gas from a location outside of said reac

A process for the treatment of granular solid material in an apparatus including: a fluidized bed reactor having an upper portion and a lower portion, a means for introducing a granular solid material into said reactor and a means for introducing at least one gas from a location outside of said reactor to a location inside of said reactor, a separator means for separating off particles of solid material from a gas-solids mixture exiting from said reactor, said separator means having a particulate collection portion and a gas collection portion, a connecting means for connecting said reactor upper portion with said separator means, a recycling means comprising a first conduit having an upstream end and a downstream end, a second conduit having an upstream end and a downstream end, and a particulate collection zone, wherein said first conduit upstream end is in open communication with said separator means particulate collection portion, and said first conduit downstream end is in open communication with said recycling means particulate collection zone, and wherein said second conduit upstream end is in open communication with said recycling means particulate collection zone, and said second conduit downstream end is in open communication with said reactor lower portion, a reduced pressure source having a downstream end in open communication with said reactor, and a suction conduit having an upstream end in open communication with said recycling means particulate collection zone, and a downstream end in open communication with said reduced pressure source, said process comprising: (a) introducing granular solid material into said reactor through said granular solid material introducing means, (b) treating said granular solid material with at least one gas, under at least atmospheric pressure, in a fluidized layer, wherein at least a portion of said granular solid material leaves said reactor with said at least one gas, (c) separating off at least a portion of said at least one gas from said granular solid material in said separator means, (d) returning said separated-off granular solid material to said reactor, by way of said recycling means, wherein said separated-off granular solid material collects within said recycling means particulate collection zone resulting in the formation of an auxiliary bed of granular solid material in said second conduit\s upstream end which is at least partially fluidized under the effect of gases flowing upwardly from said reactor lower portion into said recycling means through said second conduit downstream end, and wherein within said apparatus, which includes said reactor, said separator means and said recycling means, there is a pressure drop such that the pressure within said separator means is lower than the pressure in said reactor lower portion in which said separated off and recycled granular solid material passes back into said reactor, and (e) suctionally removing gases, which flow upwardly from said reactor lower portion into said recycling means second conduit, and which flow downwardly from said separator particulate collection portion into said first conduit, from said recycle means particulate collection zone, through a common exhaust, by creating a pressure level which, at its maximum, is substantially equal to the lowest pressure in said separator means.