Furnace for the heat treatment of lumpy to fine grained material
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorHeinrich Buchner
Life of this patent
Estimating the term…
Abstract
A furnace is disclosed for the heat treatment of mainly lumpy to fine grained material. The furnace is either a shaft furnace or a rotary furnace for the calcination or sintering of limestone, dolomite or magnesite. The calcination material passes through a preheating zone, a calcination zone and a cooling zone. The calcination zone has a gas feed and gas withdrawal device. A calcination device is provided in the calcination zone to which is connected a gas conveying device for the production of a hot gas circulation. The hot gas circulation device is situated between the gas withdrawal device and the calcination device and is provided as a conveying blower subjected to a cooling liquid.
Claims10
A shaft furnace for the high volume calcination or sintering of mainly lumpy to fine grained material including limestone, dolomite, or magnesite, comprising:
- a shaft having a preheating zone through which the material passes;
- a calcination zone in the shaft;
- a cooling zone in the shaft;
- said calcination zone having associated therewith a gas feed device, a gas withdrawal device, a calcination means for producing hot gas, and a gas conveying device means for circulation of the hot gas which is contaminated with constituents inclined to caking;
- the hot gas circulation device means including a conveying blower arranged outside the shaft acted on with cooling means and being situated between the gas withdrawal device and the calcination means;
- and said conveying blower having a radial airflow of the hot gas perpendicular to an axis of rotation of a fan wheel of the blower, and the fan wheel being attached to an external closed circuit cooling apparatus with cooling liquid therein.
A shaft furnace for the high volume calcination of material including limestone, dolomite, or magnesite, comprising:
- a shaft divided into a preheating zone, calcination zone, and cooling zone;
- the calcination zone having a gas supply chamber in communication with the shaft through apertures, a gas withdrawal chamber opposite the gas supply chamber also in communication with the shaft by apertures, a calcination chamber having a fuel inlet, a fresh air inlet, a hot gas inlet, and a hot gas outlet in communication with the gas supply chamber;
- a hot gas conveying blower having its output directly connected to the calcination chamber hot gas input, and an input of the blower being connected through an aperture to the gas withdrawal chamber;
- and the hot gas blower being arranged alongside and exterior to the shaft and having a fan wheel providing a radial expulsion of the hot gas which is contaminated with constituents inclined to caking in a direction perpendicular to an axis of a shaft retaining the fan wheel, the fan wheel having tubes therein for conveying a cooling medium from an external closed curcuit cooling apparatus.
Dependencies are inferred from the claim text.