Heating – Processes of heating or heater operation – Controlling flame position or work atmosphere
Patent
1984-07-20
1985-12-24
Camby, John J.
Heating
Processes of heating or heater operation
Controlling flame position or work atmosphere
34 15, 34 51, 432 12, 432 26, 432148, F27D 700, F27D 1300, F26B 504, F26B 2106
Patent
active
045603464
ABSTRACT:
The method relates to the hardening of form substances made of building materials and containing binding agents in a pressure chamber of an autoclave to which is conveyed a gaseous heating medium, the temperature of which is increased during a heating-up phase up to a given upper limit value. During a holding phase, the temperature is maintained at least until a given equalization temperature is reached on the inside of the form substances. Subsequently, during a cooling-down phase, the temperature is reduced by reducing the pressure to the expulsion temperature. Porous light building materials in a conventional process would absorb a high amount of water through the condensation of water resulting from steam having been conveyed into the autoclave for the purpose of hardening. However, in order to produce form substances of a low water content economically, according to the present invention, on the one hand, steam is replaced by gas which is maintained below the evaporation temperature of water through sufficient increase in pressure, and, on the other hand, as a replacement or complement, heat is conveyed to the inside of the pressure chamber before the cooling-down phase and an increase in the temperature of the steam beyond the given limit value is prevented by blowing off steam, thereby attaining an integrated drying process.
REFERENCES:
patent: 1415623 (1922-05-01), Atkinson
patent: 1572849 (1926-02-01), Secord
patent: 1643775 (1927-09-01), Kelleher
patent: 1672218 (1928-06-01), How
patent: 2431201 (1947-11-01), Ross
patent: 2929151 (1960-03-01), Hicks
Camby John J.
Sicowa Verfahrenstechnik Fuer Baustoffe GmbH & Co. KG
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