Apparatus and method for dosing a particulate phase present in a gas/particle flow from a fluidized bed
AssigneeBuhler AG
InventorsLothar Reh, Marc Tesch, Beat Hani, Arthur Ruf
Life of this patent
Estimating the term…
Abstract
Apparatus meters solid present in the gas/solid stream from a fluidized-bed apparatus, in which gas and solid are present as a prehomogenized, free-flowing mixture in a fluidized bed and in which at least one outlet orifice for removal of the gas/solid stream is provided in an outflow pipe. The metering apparatus has a discharge pipe with a gas injection nozzle for establishing a time-constant, emerging mass flow and for establishing the homogeneity of the emerging gas/solid stream. The pipe and nozzle are coordinated with an outlet orifice of the bed apparatus, and/or at least one device for influencing the prehomogenization.
Claims56
A dosing apparatus for dosing a particulate phase within a free-flowing two phase flow, consisting of a gas phase and a particulate phase, said two phase flow leaving a fluidized bed of a fluidizing apparatus with a fluidizing bottom through at least one outlet orifice of said fluidizing apparatus, said fluidized bed having a vertical bed height and a horizontal bed cross section, said dosing apparatus comprising:
- at least one discharge pipe connected to said at least one outlet orifice, said at least one discharge pipe having an inner discharge cross section, a discharge diameter and a discharge direction leading away from said at least one outlet orifice;
- controlling means adjacent to said at least one outlet orifice for controlling a constant mass flow of said particulate phase through said at least one discharge pipe and for controlling the homogeneity of said two phase flow, said controlling means comprising nozzle means for injecting gas into said two phase flow;
- and
- pneumatic gas supply means for supplying said nozzle means with gas;
- and
- wherein said nozzle means comprises at least one injection device for injecting gas into said fluidized bed.
A dosing apparatus for dosing a particulate phase within a free-flowing two phase flow, consisting of a gas phase and a particulate phase, said two phase flow leaving a fluidized bed of fluidizing apparatus with a fluidizing bottom through at least one outlet orifice of said fluidizing apparatus, said fluidized bed having a vertical bed height and a horizontal bed cross section, said dosing apparatus comprising:
- at least one discharge pipe connected to said at least one outlet orifice, said at least one discharge pipe having an inner discharge cross section, a discharge diameter and a discharge direction leading away from said at least one outlet orifice;
- controlling means adjacent to said at least one outlet orifice for controlling a constant mass flow of said particulate phase through said at least one discharge pipe and for controlling the homogeneity of said two phase flow, said controlling means comprising nozzle means for injecting gas into said two phase flow;
- pneumatic gas supply means for supplying said nozzle means with gas;
- wherein said nozzle means comprises at least one first injection device for injecting gas into said at least one discharge pipe;
- wherein said at least one first injection device comprises a hollow body with an inner at least partially gas permeable injection surface arranged within said at least one discharge pipe, said inner injection surface surrounding said discharge cross section, and a gas supply channel for supplying said hollow body with gas, said channel surrounding at least partially said hollow body and being connected to said gas supply means;
- wherein said hollow body is shaped essentially cylindrical;
- and
- wherein said hollow body has a diverging area where said discharge cross section within said hollow body becomes larger towards said at least one outlet orifice.
A dosing apparatus for dosing a particulate phase within a free-flowing two phase flow, consisting of a gas phase and a particulate phase, said two phase flow leaving a fluidized bed of fluidizing apparatus with a fluidizing bottom through at least one outlet orifice of said fluidizing apparatus, said fluidized bed having a vertical bed height and a horizontal bed cross section, said dosing apparatus comprising:
- at least one discharge pipe connected to said at least one outlet orifice, said at least one discharge pipe having an inner discharge cross section, a discharge diameter and a discharge direction leading away from said least one outlet orifice;
- controlling means adjacent to said at least one outlet orifice for controlling a constant mass flow of said particulate phase through said at least one discharge pipe and for controlling the homogeneity of said two phase flow, said controlling means comprising nozzle means for injecting gas into said two phase flow;
- pneumatic gas supply means for supplying said nozzle means with gas;
- wherein said nozzle means comprises at least one first injection device for injecting gas into said at least one discharge pipe;
- wherein said at least one first injection device comprises a hollow body with an inner at least partially gas permeable injection surface arranged within said at least one discharge pipe, said inner injection surface surrounding said discharge cross section, and a gas supply channel for supplying said hollow body with gas, said channel surrounding at least partially said hollow body and being connected to said gas supply means;
- wherein said inner injection surface has a bore connected to said gas supply channel for injecting gas;
- and
- wherein said hollow body has a cylindrical area and a diverging area where said discharge cross section within said hollow body becomes larger towards said at least one outlet orifice, there being a bore connecting said area for injection of gas.
A dosing apparatus for dosing a particulate phase within a free-flowing two phase flow, consisting of a gas phase and a particulate phase, said two phase flow leaving a fluidized bed of fluidizing apparatus with a fluidizing bottom through at least one outlet orifice of said fluidizing apparatus, said fluidized bed having a vertical bed height and a horizontal bed cross section, said dosing apparatus comprising:
- at least one discharge pipe connected to said at least one outlet orifice, said at least one discharge pipe having an inner discharge cross section, a discharge diameter and a discharge direction leading away from said at least one outlet orifice;
- controlling means adjacent to said at least one outlet orifice for controlling a constant mass flow of said particulate phase through said at least one discharge pipe and for controlling the homogeneity of said two phase flow, said controlling means comprising nozzle means for injecting gas into said two phase flow;
- pneumatic gas supply means for supplying said nozzle means with gas;
- wherein said nozzle means comprises at least one first injection device for injecting gas into said at least one discharge pipe;
- wherein said at least one first injection device comprises a hollow body with an inner at least partially gas permeable injection surface arranged within said at least one discharge pipe, said inner injection surface surrounding said discharge cross section, and a gas supply channel for supplying said hollow body with gas, said channel surrounding at least partially said hollow body and being connected to said gas supply means;
- wherein said inner injection surface has a bore connected to said gas supply channel for injecting gas;
- and
- wherein said hollow body has a cylindrical area and a diverging area where said discharge cross section within said hollow body becomes larger towards said at least one outlet orifice, said bore is located in a transition zone between said cylindrical and said diverging area.
A dosing apparatus for dosing a particulate phase within a free-flowing two phase flow, consisting of a gas phase and a particulate phase, said two phase flow leaving a fluidized bed of fluidizing apparatus with a fluidizing bottom through at least one outlet orifice of said fluidizing apparatus, said fluidized bed having a vertical bed height and a horizontal bed cross section, said dosing apparatus comprising:
- at least one discharge pipe connected to said at least one outlet orifice, said at least one discharge pipe having an inner discharge cross section, a discharge diameter and a discharge direction leading away from said at least one outlet orifice;
- controlling means adjacent to said at least one outlet orifice for controlling a constant mass flow of said particulate phase through said at least one discharge pipe and for controlling the homogeneity of said two phase flow, said controlling means comprising nozzle means for injecting gas into said two phase flow;
- pneumatic gas supply means for supplying said nozzle means with gas;
- wherein said nozzle means comprises at least one injection device for injecting gas into said fluidized bed;
- said nozzle means comprises at least one first injection device for injecting gas into said at least one discharge pipe;
- and
- said at least one first injection device comprises a hollow body with an inner at least one partially gas permeable injection surface arranged within said at least one discharge pipe.
A dosing apparatus for dosing a particulate phase within a free-flowing two phase flow, consisting of a gas phase and a particulate phase, said two phase flow leaving a porous fluidized bed of fluidizing apparatus with a porous fluidizing bottom through at least one outlet orifice of said fluidizing apparatus, said fluidized bed having a vertical bed height and a horizontal bed cross section, said dosing apparatus comprising:
- at least one discharge pipe connected to said at least one outlet orifice, said at least one discharge pipe having an inner discharge cross section, a discharge diameter and a discharge direction leading away from said at least one outlet orifice;
- controlling means adjacent to said at least one outlet orifice for controlling a constant mass flow of said particulate phase through said at least one discharge pipe and for controlling the homogeneity of said two phase flow, said controlling means comprising nozzle means for injecting gas into said two phase flow;
- pneumatic gas supply means for supplying said nozzle means with gas;
- at least one first pressure sensor for measuring the pressure within said discharge pipe at about said at least one outlet orifice;
- at least one second pressure sensor for measuring the pressure above said fluidizing bottom;
- and
- difference pressure deducing means for computing pressure differences between said at least one first and second pressure sensors, said pressure differences representing measures of said bed height and being dependent on a porosity of said fluidizing bottom and a porosity of said fluid bed.
A dosing apparatus for dosing a particulate phase within a free-flowing two phase flow, consisting of a gas phase and a particulate phase, said two phase flow leaving a fluidized bed of fluidizing apparatus with a fluidizing bottom through at least one outlet orifice of said fluidizing apparatus, said fluidized bed having a vertical bed height and a horizontal bed cross section, said dosing apparatus comprising:
- at least one discharge pipe connected to said at least one outlet orifice, said at least one discharge pipe having an inner discharge cross section, a discharge diameter and a discharge direction leading away from said at least one outlet orifice;
- controlling means adjacent to said at least one outlet orifice for controlling a constant mass flow of said particulate phase through said at least one discharge pipe and for controlling the homogeneity of said two phase flow, said controlling means comprising nozzle means for injecting gas into said two phase flow;
- pneumatic gas supply means for supplying said nozzle means with gas;
- wherein said nozzle means comprises at least one first injection device for injecting gas into said at least one discharge pipe;
- wherein said at least one first injection device comprises a hollow body with an inner at least partially gas permeable injection surface arranged within said at least one discharge pipe, said inner injection surface surrounding said discharge cross section, and a gas supply channel for supplying said hollow body with gas, said channel surrounding at least partially said hollow body and being connected to said gas supply means;
- and
- wherein said dosing apparatus further comprises at least one injection nozzle located in said discharge direction after said hollow body, said at least one injection nozzle supplying said at least one discharge pipe with conveying gas around said two phase flow.
Dependencies are inferred from the claim text.