Control system to regulate the wall temperature of a pressure ve

Details Control system to regulate the wall temperature of a pressure ve Control system to regulate the wall temperature of a pressure ve

1976-12-20

1978-07-11

Geoghegan, Edgar W.

Heat exchange

Movable heating or cooling surface

Rotary drum

165 40, 176 60, G05D 2300

Patent

active

040995542

ABSTRACT:
A control system for a pressure vessel receiving a flow of hot rare gas, such as helium, from a nuclear reactor. The control system includes a thermocouple supported on the vessel wall within an airgap formed by an outwardly-spaced layer of insulation. An aperture in the bottom of the layer of insulation feeds air into the airgap. Air is withdrawn through an aperture in the top of the layer of insulation and passed along a conduit containing a control valve, and thence, through a motor controlled blower to a chimney. A controller receives the signal from the thermocouple for adjusting the control valve to both maintain a small continuous airflow and adjustably control the flow of air delivered by the conduit line to the chimney. The controller also controls the motor-driven blower. The flow of helium through the pressure vessel is detected to provide an output signal for controllably varying the operation of the blower. The same blower may be controlled by detector means which respond to the operation of a second blower used within the pressure vessel to maintain a flow of helium therethrough. In the absence of helium flow, the detector is energized to operate the blower associated with the chimney to prevent the development of an excessive wall temperature of the pressure vessel.

REFERENCES:
patent: 3251747 (1966-05-01), Franke et al.

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