Method of burning granular or pulverulent raw material and kiln plant therefor
US4045162A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1975 |
| Grant date | Aug 30, 1977 |
| Priority date | — |
| Expiry date | Oct 28, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27B7/205
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method is disclosed for heat treating granular or pulverulent raw material wherein the raw material is directed to a heat exchanger having at least two preheating units operating in parallel, each preheating unit having at least a first preheating stage and at least a lowermost calcination stage to effect a preheating and at least partial calcination of the material. The preheated, at least partially calcined material is fed from the heat exchanger into a kiln and undergoes a sintering process in the kiln. The sintered material is directed from the kiln into a cooling means in which cooling air is directed in a manner to effect a heat exchange between the material and the cooling air. The method further comprises dividing the heated cooling air exiting the cooling means and directing a portion of the heated cooling air to at least one of the calcination stages of the heat exchanger and directing a portion thereof to the kiln in excess of that required to support combustion of fuel in the kiln for the sintering process thereby intensifying the effectiveness of a material cooling zone within the kiln proper. Hot kiln exit gases are directed to at least one of the calcination stages…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.