Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1984-10-18
1986-05-13
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 48, 34 53, F26B 2110
Patent
active
045877432
ABSTRACT:
A method of controlling the temperature of a drying machine by controlling the heat medium supply thereto in response to a signal representative of the temperature generated by a temperature detector for detecting the temperature of the drying machine comprising the steps of: supplying the heat medium to the drying machine for a period of time which is determined in accordance with an error signal between a reference signal corresponding to a preset target temperature range and said temperature signal and stopping the heat medium supply for a predetermined period of time after the lapse of the heat supplying period of time if said detected temperature does not reach at said predetermined target temperature range and change in temperature per unit time obtained from said temperature signal is equal to or lower than a predetermined value; stopping the heat medium supply if the detected signal does not reach at said target temperature range and said change in temperature per unit time is higher than said predetermined value; supplying the heat medium to the drying machine for the period of time determined in accordance with the error signal and stopping the heat medium supply for the predetermined period of time after lapse of the heat medium supply period if the detected temperature falls within said target temperature range and the change in temperature per unit time is equal to or lower than a predetermined minus value falls within said target temperature range and the change in temperature per unit is higher than said predetermined minus value; and stopping the heat medium supply if the detected temperature surpasses said target temperature range.
REFERENCES:
patent: 3840025 (1974-10-01), Fowler et al.
patent: 3905123 (1975-09-01), Fowler et al.
Nambu Yutaka
Saitoh Yasuo
Sugawara Hitosi
Schwartz Larry I.
The Japan Tobacco & Salt Public Corporation
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