Method of autoclaving porous piece-goods especially moulded bodies of porous concrete

US5366673A · kind A · utility

Assignees

• Hebel Aktiengesellschaft · DE
• Sicowa Verfahrenstechnik Fur Baustoffe GmbH & Co., KG · DE

Inventors

• Franz Wosnitza · Aachen, DE
• Georg Beckmann · Wien, AT
• Georg Zimmermann · Gerlingen, DE

Key dates

• Filing date: Oct 20, 1992
• Grant date: Nov 22, 1994
• Expiry date: Oct 20, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S264/43
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method of autoclaving porous piece-goods, by steam under pressure, wherein the autoclaving operation includes sequential phases of heating with steam, holding, and then relaxing the pressure and temperature, wherein the holding phase includes a drying process. In order to obtain as dry a product as possible with the smallest possible energy input, it is provided that a drying process is carried out within the holding phase in which the autoclave is heated more than to compensate for heat losses and to a temperature above the temperature of vaporization of the water so that the material is dried by controlled discharge of steam from the interior of the autoclave. The steam discharged from one or more autoclaves during the drying process is used to heat up at least partially an autoclave to be heated.