Patent ID: 11906245
Assignee: CMPC TISSUE S.A.
Field: Chemical engineering (Chemistry)
Classification: CPC D  F  B | IPC B  F

Claim 13:
14. A method for controlling an electric heater mixing plenum used in a drying system, comprising:
controlling a first inlet damper and a first outlet damper of a first chamber of the electric heater mixing plenum to open positions to allow air flow through the first chamber into a mixing chamber of the electric heater mixing plenum, wherein the first chamber includes a resistance-type electric air heater;
controlling a second inlet damper of a second chamber of the electric heater mixing plenum to an open position to allow air flow through the second chamber into the mixing chamber, wherein the second chamber is adjacently disposed to the first chamber within the electric heater mixing plenum;
monitoring a temperature of process air at an upstream end of the electric heater mixing plenum, a temperature of electrically reheated air from the first chamber, and a temperature of reheated air from the mixing chamber; and
comparing the monitored temperatures to preselected temperatures; and
based on the comparison, controlling the positions of the first inlet damper, and the second inlet damper to adjust air flow through the first chamber and the second chamber,
wherein the first inlet damper and the second inlet damper are positioned at the upstream end of the electric heater mixing plenum and the mixing chamber is positioned at a downstream end of the electric heater mixing plenum.