Installation for thermal treatment of suspended powder substances, and use for flash calcining of mineral, in particular clayey, substances
AssigneeDemeter Technologies
InventorsGilbert Raynaud, Olivier Pons, Pierre Valmalette, Sylvain Salvador
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Abstract
An installation for quick thermal treatment of suspended powder substances, in particular for flash calcining of mineral substances, comprises modules advantageously arranged in mobile units including elements for supplying powder substances, a combustion chamber wherein the substances are introduced suspended in a hot air flux and a cooling assembly where the calcined substances are recuperated to pre-heat the combustion air. The substances are pneumatically transported in the heated air downstream of the supplying elements, via a pre-heating device up to the combustion chamber.
Claims17
An installation for carrying out the heat treatment of suspended powdered materials, in particular a flash calcination of mineral materials, comprising:
- means (M1) for feeding in powdered materials,
- a device (17) for preheating the materials, provided with an inlet for hot gases (17a), an outlet for the preheated materials (18) and a gas outlet (35),
- a combustion chamber (21) containing at, least one burner (49) and provided with an inlet (21a) for introducing reheated air and preheated materials, and an outlet for fumes (21b) containing the materials after passage through the chamber,
- a separator (23) provided with an inlet receiving the fumes and powdered materials coming from the combustion chamber, a fume outlet (33) connected to the inlet for hot gases of the preheating device, and a materials outlet (24),
- an assembly (M3) for cooling the materials, provided with an inlet (25) for powdered materials coming from the separator, an inlet (31) for fresh air, so-called principal air, an outlet (30) for cooled materials and a reheated principal air outlet (32),
- at least two conduits (20, 16) connected to the reheated principal air outlet (32) of the cooling assembly with a view to dividing the reheated principal air into two flows, one referred to as reheated air and the other as diverted air, the reheated air conduit (20) being provided with an inlet (19) for materials connected to the preheated materials outlet (18) of the preheating device (17), with a view to introducing the said materials into the said conduit (20), and being connected to the reheated air inlet (21a) of the combustion chamber (21) with a view to injecting the said materials into the said combustion chamber, said installation extending vertically between a lower level (Ni) and an upper level (Ns), wherein the diverted air conduit, the so-called by-pass conduit (16), includes a section (16a) descending from the reheated principal air outlet (32) to the lower level (Ni) of the installation, and is connected to the means of supply (M1) by a powdered material inlet (15) in the vicinity of the said lower level (Ni) with a view to receiving the powdered materials, and includes a section (16b) rising towards the fume outlet (33) of the separator to form therewith a common conduit (34) connected to the hot gas inlet (17a) of the preheating device (17), with a view to providing pneumatic transport for the said powdered materials from the level Ni and a first heating of these upstream from the said preheating device.
Dependencies are inferred from the claim text.