Energy conserving limestone calcining system
US4748010A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1985 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Mar 11, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/40
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
Energy conserving limestone calcining system, including a process and apparatus in which in a first step or kiln zone limestone is heated, e.g., at 1700.degree.-2100.degree. F., sufficiently to achieve more than only about 50 or 60%, e.g., 75%, partial conversion thereof to calcium oxide and carbon dioxide and to form a partially calcined hot mass containing sufficient retained heat for substantially completing the conversion of the remaining unconverted limestone therein, and thereafter in a second step or separate vacuum chamber zone substantially completing the conversion of the limestone in the hot mass to calcium oxide and carbon dioxide by such retained heat while subjecting the partially calcined hot mass to a vacuum sufficiently to remove substantially completely the resultant carbon dioxide and for a duration sufficient to achieve such substantially complete conversion of the limestone and thereby provide a substantially completely calcined hot mass, the apparatus including a closable calcining vacuum chamber separate from and adjacent the discharge outlet of a lime kiln and arranged for receiving therefrom the partially calcined hot mass for completing the conversion of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.