Fly ash dosing method for dosing and device therefor
AssigneeBuhler AG
InventorsFrank Goedicke, Wilhelm Herzmann, Arthur Ruf
Life of this patent
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Abstract
A method for dosing and particularly for mixing substances, particularly for mixing at least one granular or powdery solid matter with a liquid. A first substance, particularly the granular or powdery solid matter is liquidized by means of a gas fed continuously or pulsatingly, and after that this homogenized gas/matter mixture is brought together in a time stable, dosed manner and mixed with a second substance, particularly a liquid. For dosing the homogenized gas/matter mixture, there is additionally supplied to it gas prior to the mixing with the second substance, with this gas being supplied to the gas/matter stream in a sheathing way and parallel to its direction of flow.
Claims16
A method for dosing material which is particulate or pulverized by use of fluidizing apparatus comprising a chamber holding a fluidized bed and having an outlet nozzle assembly, the method comprising steps of:
- draining said material off a bottom area of said fluidized bed;
- conducting said material into a mixer;
- feeding a substance into said mixer via supply means;
- mixing said material with said substance in said mixer;
- supplying a further gas, in addition to a gas of the fluidized bed, to said material prior to said mixing step for accomplishing a dosing of said material with said further gas;
- measuring a solid content of the fluidized bed at plural sites of measurement in said fluidizing apparatus to obtain a measure of the solid content;
- using measurements attained at the plural measurement sites to control a flow rate of said further gas into the fluidized bed;
- and
- adjusting a rate of feeding of the substance into said mixer in said feeding step relative to a rate of the conducting of the material into said mixer in response to the measure of the solid content to make the rate of feeding the substance into the mixer proportional to the rate of conducting the material into the mixer.
Apparatus including a fluidized bed for dosing particulate material treated in the fluidized bed, wherein the material is drained from a bottom area of the fluidized bed after treatment of the material, the apparatus comprising:
- a fluidizing assembly comprising a chamber holding the fluidized bed, and an outlet nozzle assembly at a bottom of the fluidized bed;
- a first inlet for admitting the particulate material to the fluidized bed, and a second inlet for admitting a gas to the fluidized bed, the second inlet comprising a gas permeable bottom of said chamber;
- mixing means disposed downstream of said outlet nozzle assembly for receiving contents of the fluidized bed, said mixing means including means for supplying a further substance into said mixing means;
- means responsive to a flow rate of the particulate material through said fluidizing assembly for regulating a rate of flow of the further substance into said mixing means relative to a rate of flow of the particulate material through said fluidizing assembly to make the substance flow rate proportional to the material flow rate;
- and
- wherein said mixing means is operative to mix the contents of the fluidized bed, as outputted by said nozzle assembly, with said further substance;
- said nozzle assembly includes a gas admission port for dosing the particulate material in the fluidized bed prior to a mixing of the contents of the fluidized bed in said mixing means;
- and
- the apparatus is operative to create a two-phase mixture of the particulate material and a gas prior to the mixing of the contents of the fluidized bed in said mixing means.
Dependencies are inferred from the claim text.